:root{--qt-color-brand-primary-raw: #0078D4;--qt-color-brand-primary-dark: #106EBE;--qt-color-brand-primary-darker: #005A9E;--qt-color-brand-primary-light: #C7E0F4;--qt-color-brand-primary-lighter: #DEECF9;--qt-color-brand-lightest: #EFF6FC;--qt-color-neutral-grey-raw: #808080;--qt-color-neutral-grey-10: #F5F5F5;--qt-color-neutral-grey-20: #EDEBE9;--qt-color-neutral-grey-30: #E1DFDD;--qt-color-neutral-grey-40: #D2D0CE;--qt-color-neutral-grey-50: #B3B0AD;--qt-color-neutral-grey-60: #8A8886;--qt-color-neutral-grey-70: #605E5C;--qt-color-neutral-grey-80: #484644;--qt-color-neutral-grey-90: #323130;--qt-color-neutral-grey-100: #201F1E;--qt-color-neutral-grey-110: #0F0F0F;--qt-color-neutral-white: #FFFFFF;--qt-color-neutral-black: #000000;--qt-color-success-raw: #107C10;--qt-color-warning-raw: #797775;--qt-color-severe-warning-raw: #D83B01;--qt-color-error-raw: #A80000;--qt-color-danger-raw: #A80000;--qt-font-family-base: "Segoe UI", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Roboto", "Helvetica Neue", Arial, sans-serif;--qt-font-family-monospace: "Consolas", "Courier New", "Courier", monospace;--qt-font-size-base-raw: 14px;--qt-font-size-hero: 42px;--qt-font-size-page-title: 28px;--qt-font-size-section-header: 20px;--qt-font-size-large: 18px;--qt-font-size-base-plus: 16px;--qt-font-size-base: 14px;--qt-font-size-small: 12px;--qt-font-size-tiny: 10px;--qt-font-weight-light: 300;--qt-font-weight-semilight: 350;--qt-font-weight-normal: 400;--qt-font-weight-medium: 500;--qt-font-weight-semibold: 600;--qt-font-weight-bold: 700;--qt-line-height-hero: 50px;--qt-line-height-page-title: 36px;--qt-line-height-section-header: 28px;--qt-line-height-large: 24px;--qt-line-height-base-plus: 22px;--qt-line-height-base: 20px;--qt-line-height-small: 16px;--qt-line-height-tiny: 14px;--qt-spacing-none: 0;--qt-spacing-tiny-1: 2px;--qt-spacing-tiny: 4px;--qt-spacing-small-1: 6px;--qt-spacing-small: 8px;--qt-spacing-medium-1: 10px;--qt-spacing-medium: 12px;--qt-spacing-medium-2: 14px;--qt-spacing-large: 16px;--qt-spacing-large-1: 20px;--qt-spacing-larger: 24px;--qt-spacing-larger-1: 28px;--qt-spacing-xl: 32px;--qt-spacing-xl-1: 36px;--qt-spacing-xxl: 40px;--qt-spacing-xxl-1: 48px;--qt-spacing-xxxl: 60px;--qt-spacing-xxxl-1: 72px;--qt-radius-none: 0;--qt-radius-small: 2px;--qt-radius-medium: 4px;--qt-radius-large: 6px;--qt-radius-larger: 8px;--qt-radius-xl: 12px;--qt-radius-xxl: 16px;--qt-radius-round: 9999px;--qt-stroke-width-none: 0;--qt-stroke-width-thin: 1px;--qt-stroke-width-medium: 2px;--qt-stroke-width-thick: 3px;--qt-stroke-width-thicker: 4px;--qt-shadow-none: none;--qt-shadow-4: 0 .8px 2.2px rgba(0, 0, 0, .02), 0 2.2px 6px rgba(0, 0, 0, .03);--qt-shadow-8: 0 1.6px 4.4px rgba(0, 0, 0, .02), 0 4.4px 12px rgba(0, 0, 0, .03);--qt-shadow-16: 0 3.2px 8.8px rgba(0, 0, 0, .02), 0 8.8px 24px rgba(0, 0, 0, .03);--qt-shadow-28: 0 5.6px 15.4px rgba(0, 0, 0, .03), 0 15.4px 42px rgba(0, 0, 0, .04);--qt-shadow-64: 0 12.8px 35.2px rgba(0, 0, 0, .04), 0 35.2px 96px rgba(0, 0, 0, .05);--qt-duration-instant: 50ms;--qt-duration-fast: .1s;--qt-duration-normal: .2s;--qt-duration-gentle: .3s;--qt-duration-slow: .4s;--qt-duration-slower: .5s;--qt-easing-linear: linear;--qt-easing-default: cubic-bezier(.33, 1, .68, 1);--qt-easing-decelerate: cubic-bezier(0, 0, 0, 1);--qt-easing-accelerate: cubic-bezier(1, 0, 1, 1);--qt-zindex-base: 0;--qt-zindex-dropdown: 1000;--qt-zindex-modal: 2000;--qt-zindex-tooltip: 3000;--qt-zindex-topmost: 4000;--qt-color-brand-primary: var(--qt-color-brand-primary-raw);--qt-color-brand-primary-hover: var(--qt-color-brand-primary-dark);--qt-color-brand-pressed: var(--qt-color-brand-primary-darker);--qt-color-brand-subtle: var(--qt-color-brand-primary-light);--qt-color-brand-background: var(--qt-color-brand-primary-lighter);--qt-color-brand-background-hover: var(--qt-color-brand-lightest);--qt-color-bg-default: var(--qt-color-neutral-white);--qt-color-bg-subtle: var(--qt-color-neutral-grey-10);--qt-color-bg-soft: var(--qt-color-neutral-grey-20);--qt-color-bg-strong: var(--qt-color-neutral-grey-30);--qt-color-bg-brand: var(--qt-color-brand-primary);--qt-color-bg-inverse: var(--qt-color-neutral-grey-90);--qt-color-text-primary: var(--qt-color-neutral-grey-100);--qt-color-text-secondary: var(--qt-color-neutral-grey-70);--qt-color-text-tertiary: var(--qt-color-neutral-grey-60);--qt-color-text-disabled: var(--qt-color-neutral-grey-50);--qt-color-text-on-brand: var(--qt-color-neutral-white);--qt-color-text-inverse: var(--qt-color-neutral-white);--qt-color-border-default: var(--qt-color-neutral-grey-30);--qt-color-border-subtle: var(--qt-color-neutral-grey-20);--qt-color-border-strong: var(--qt-color-neutral-grey-40);--qt-color-border-brand: var(--qt-color-brand-primary);--qt-color-border-focused: var(--qt-color-brand-primary);--qt-color-border-error: var(--qt-color-error-raw);--qt-color-success: var(--qt-color-success-raw);--qt-color-success-background: #DFF6DD;--qt-color-warning: var(--qt-color-warning-raw);--qt-color-warning-background: #FFF4CE;--qt-color-severe-warning: var(--qt-color-severe-warning-raw);--qt-color-severe-warning-background: #FDE7E9;--qt-color-error: var(--qt-color-error-raw);--qt-color-error-background: #FDE7E9;--qt-color-danger: var(--qt-color-danger-raw);--qt-color-danger-background: #FDE7E9;--qt-color-star-inactive: var(--qt-color-neutral-grey-40);--qt-color-star-active: #F59E0B;--qt-typography-hero: var(--qt-font-weight-semibold) var(--qt-font-size-hero) / var(--qt-line-height-hero) var(--qt-font-family-base);--qt-typography-page-title: var(--qt-font-weight-semibold) var(--qt-font-size-page-title) / var(--qt-line-height-page-title) var(--qt-font-family-base);--qt-typography-section-header: var(--qt-font-weight-semibold) var(--qt-font-size-section-header) / var(--qt-line-height-section-header) var(--qt-font-family-base);--qt-typography-large: var(--qt-font-weight-medium) var(--qt-font-size-large) / var(--qt-line-height-large) var(--qt-font-family-base);--qt-typography-base-plus: var(--qt-font-weight-normal) var(--qt-font-size-base-plus) / var(--qt-line-height-base-plus) var(--qt-font-family-base);--qt-typography-base: var(--qt-font-weight-normal) var(--qt-font-size-base) / var(--qt-line-height-base) var(--qt-font-family-base);--qt-typography-small: var(--qt-font-weight-normal) var(--qt-font-size-small) / var(--qt-line-height-small) var(--qt-font-family-base);--qt-typography-tiny: var(--qt-font-weight-normal) var(--qt-font-size-tiny) / var(--qt-line-height-tiny) var(--qt-font-family-base);--qt-typography-monospace: var(--qt-font-weight-normal) var(--qt-font-size-base) / var(--qt-line-height-base) var(--qt-font-family-monospace);--qt-spacing-s-quark: var(--qt-spacing-tiny-1);--qt-spacing-s-nano: var(--qt-spacing-tiny);--qt-spacing-s-micro: var(--qt-spacing-small-1);--qt-spacing-s-small: var(--qt-spacing-small);--qt-spacing-s-medium: var(--qt-spacing-medium);--qt-spacing-s-large: var(--qt-spacing-large);--qt-spacing-s-xl: var(--qt-spacing-xl);--qt-spacing-s-xxl: var(--qt-spacing-xxl);--qt-spacing-s-xxxl: var(--qt-spacing-xxxl);--qt-radius-control: var(--qt-radius-medium);--qt-radius-card: var(--qt-radius-xl);--qt-radius-pill: var(--qt-radius-round);--qt-shadow-card: var(--qt-shadow-4);--qt-shadow-dropdown: var(--qt-shadow-16);--qt-shadow-modal: var(--qt-shadow-28);--qt-shadow-tooltip: var(--qt-shadow-8);--qt-focus-ring-border: var(--qt-stroke-width-thin) solid var(--qt-color-brand-primary);--qt-focus-ring-shadow: 0 0 0 3px var(--qt-color-brand-subtle);--qt-focus-ring: var(--qt-focus-ring-border), var(--qt-focus-ring-shadow);--qt-icon-size-tiny: 10px;--qt-icon-size-small: 12px;--qt-icon-size-medium: 16px;--qt-icon-size-large: 20px;--qt-icon-size-xl: 24px;--qt-icon-size-xxl: 32px;--qt-container-width-narrow: 600px;--qt-container-width-medium: 860px;--qt-container-width-wide: 1200px;--qt-container-width-full: 1440px;--qt-button-bg-primary: var(--qt-color-brand-primary);--qt-button-bg-primary-hover: var(--qt-color-brand-primary-hover);--qt-button-bg-primary-pressed: var(--qt-color-brand-pressed);--qt-button-text-primary: var(--qt-color-text-on-brand);--qt-button-bg-secondary: var(--qt-color-bg-default);--qt-button-bg-secondary-hover: var(--qt-color-bg-subtle);--qt-button-text-secondary: var(--qt-color-text-primary);--qt-button-border-secondary: var(--qt-color-border-default);--qt-button-height: 32px;--qt-button-padding-horizontal: var(--qt-spacing-medium-2);--qt-button-radius: var(--qt-radius-control);--qt-input-bg: var(--qt-color-bg-default);--qt-input-bg-hover: var(--qt-color-bg-default);--qt-input-bg-focused: var(--qt-color-bg-default);--qt-input-bg-disabled: var(--qt-color-bg-subtle);--qt-input-border: var(--qt-color-border-default);--qt-input-border-hover: var(--qt-color-border-strong);--qt-input-border-focused: var(--qt-color-border-focused);--qt-input-border-disabled: var(--qt-color-border-subtle);--qt-input-text: var(--qt-color-text-primary);--qt-input-text-placeholder: var(--qt-color-text-disabled);--qt-input-height: 32px;--qt-input-radius: var(--qt-radius-control);--qt-input-padding: var(--qt-spacing-small) var(--qt-spacing-medium);--qt-card-bg: var(--qt-color-bg-default);--qt-card-bg-hover: var(--qt-color-bg-subtle);--qt-card-border: var(--qt-color-border-subtle);--qt-card-shadow: var(--qt-shadow-card);--qt-card-radius: var(--qt-radius-card);--qt-card-padding: var(--qt-spacing-large);--qt-badge-bg-brand: var(--qt-color-brand-background);--qt-badge-text-brand: var(--qt-color-brand-primary);--qt-badge-radius: var(--qt-radius-pill);--qt-badge-padding-vertical: var(--qt-spacing-tiny);--qt-badge-padding-horizontal: var(--qt-spacing-medium);--qt-link-color: var(--qt-color-brand-primary);--qt-link-color-hover: var(--qt-color-brand-primary-hover);--qt-link-color-visited: var(--qt-color-brand-primary)}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--qt-color-bg-default: var(--qt-color-neutral-grey-90);--qt-color-bg-subtle: var(--qt-color-neutral-grey-80);--qt-color-bg-soft: var(--qt-color-neutral-grey-70);--qt-color-bg-strong: var(--qt-color-neutral-grey-60);--qt-color-text-primary: var(--qt-color-neutral-white);--qt-color-text-secondary: var(--qt-color-neutral-grey-30);--qt-color-text-tertiary: var(--qt-color-neutral-grey-40);--qt-color-text-disabled: var(--qt-color-neutral-grey-50);--qt-color-border-default: var(--qt-color-neutral-grey-60);--qt-color-border-subtle: var(--qt-color-neutral-grey-70);--qt-color-border-strong: var(--qt-color-neutral-grey-50);--qt-color-success-background: rgba(16, 124, 16, .2);--qt-color-warning-background: rgba(121, 119, 117, .2);--qt-color-error-background: rgba(168, 0, 0, .2)}}html[data-theme=dark]{--qt-color-bg-default: var(--qt-color-neutral-grey-90);--qt-color-bg-subtle: var(--qt-color-neutral-grey-80);--qt-color-bg-soft: var(--qt-color-neutral-grey-70);--qt-color-bg-strong: var(--qt-color-neutral-grey-60);--qt-color-text-primary: var(--qt-color-neutral-white);--qt-color-text-secondary: var(--qt-color-neutral-grey-30);--qt-color-text-tertiary: var(--qt-color-neutral-grey-40);--qt-color-text-disabled: var(--qt-color-neutral-grey-50);--qt-color-border-default: var(--qt-color-neutral-grey-60);--qt-color-border-subtle: var(--qt-color-neutral-grey-70);--qt-color-border-strong: var(--qt-color-neutral-grey-50);--qt-color-success-background: rgba(16, 124, 16, .2);--qt-color-warning-background: rgba(121, 119, 117, .2);--qt-color-error-background: rgba(168, 0, 0, .2)}@media (prefers-reduced-motion: reduce){:root{--qt-duration-instant: 0ms;--qt-duration-fast: 0ms;--qt-duration-normal: 0ms;--qt-duration-gentle: 0ms;--qt-duration-slow: 0ms;--qt-duration-slower: 0ms}}:root{font-family:var(--qt-font-family-base);line-height:var(--qt-line-height-base);font-weight:var(--qt-font-weight-normal);color-scheme:light;color:var(--qt-color-text-primary);background-color:var(--qt-color-bg-subtle);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}html[data-theme=dark]{color-scheme:dark}*{box-sizing:border-box}body{margin:0;padding:0;min-width:320px;min-height:100vh;color:var(--qt-color-text-primary);background-color:var(--qt-color-bg-subtle)}h1,h2,h3,h4,h5,h6{margin:0;font-weight:var(--qt-font-weight-semibold);color:var(--qt-color-text-primary)}h1{font:var(--qt-typography-page-title)}h2{font:var(--qt-typography-section-header)}h3{font:var(--qt-typography-large)}h4{font-size:var(--qt-font-size-base-plus);font-weight:var(--qt-font-weight-semibold);line-height:var(--qt-line-height-base-plus)}p{margin:0 0 var(--qt-spacing-small) 0}a{font-weight:var(--qt-font-weight-medium);color:var(--qt-link-color);text-decoration:none;transition:color var(--qt-duration-fast) var(--qt-easing-default)}a:hover{color:var(--qt-link-color-hover)}a:focus-visible{outline:var(--qt-focus-ring);outline-offset:2px;border-radius:var(--qt-radius-medium)}button{font-family:var(--qt-font-family-base)}button:focus-visible{outline:var(--qt-focus-ring);outline-offset:2px}input,textarea,select{font-family:var(--qt-font-family-base)}input:focus-visible,textarea:focus-visible,select:focus-visible{outline:var(--qt-focus-ring);outline-offset:0}code{font-family:var(--qt-font-family-monospace);font-size:.9em;background-color:var(--qt-color-bg-subtle);padding:2px 6px;border-radius:var(--qt-radius-small)}pre{font-family:var(--qt-font-family-monospace);background-color:var(--qt-color-bg-soft);border-radius:var(--qt-radius-large);padding:var(--qt-spacing-medium);overflow-x:auto}pre code{background-color:transparent;padding:0}::-webkit-scrollbar{width:12px;height:12px}::-webkit-scrollbar-track{background:var(--qt-color-bg-subtle)}::-webkit-scrollbar-thumb{background:var(--qt-color-border-default);border-radius:var(--qt-radius-larger);border:3px solid var(--qt-color-bg-subtle)}::-webkit-scrollbar-thumb:hover{background:var(--qt-color-border-strong)}::selection{background-color:var(--qt-color-brand-background);color:var(--qt-color-brand-primary)}@media screen and (max-width: 768px){.app-container,body .app-container,html .app-container{padding:10px 0!important;margin:0!important;min-height:100vh!important;background:#f5f5f5!important;overflow-x:hidden!important}.header,.mobile-simple-header{box-sizing:border-box;max-width:100vw;padding-left:20px;padding-right:20px}.header,body .header,html .header{padding:8px 12px!important;height:auto!important;min-height:80px!important;-webkit-backdrop-filter:blur(10px)!important;backdrop-filter:blur(10px)!important;background:#fffffff2!important;box-shadow:0 2px 8px #0000001a!important;display:flex!important;flex-direction:column!important;gap:8px!important;position:sticky!important;top:0!important;z-index:1000!important;overflow:hidden!important}.main-nav{width:100%;overflow-x:auto;overflow-y:hidden;scrollbar-width:none;-ms-overflow-style:none;-webkit-overflow-scrolling:touch;scroll-behavior:smooth;display:flex;align-items:center;padding:0 4px}.mobile-nav-container{position:fixed;top:0;left:0;right:0;width:100%;background:#fff;border-bottom:1px solid #e0e0e0;z-index:1000;box-shadow:0 1px 3px #0000001a}.mobile-nav-scroll{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;scrollbar-width:none;-ms-overflow-style:none;padding:0;gap:0}.mobile-nav-scroll::-webkit-scrollbar{display:none}.mobile-nav-item{flex:1;min-width:60px;max-width:none;padding:12px 8px;background:transparent;border-radius:0;border:none;border-bottom:3px solid transparent;text-align:center;cursor:pointer;transition:all .2s ease;box-shadow:none;position:relative}.mobile-nav-item:hover{transform:none;box-shadow:none;border-color:#e3f2fd}.mobile-nav-item.active{background:transparent;color:#007bff;transform:none;box-shadow:none}.mobile-nav-item.active:after{content:"";position:absolute;bottom:0;left:25%;right:25%;height:3px;background:#007bff;border-radius:2px 2px 0 0}.mobile-nav-item-text{font-size:13px;font-weight:500;line-height:1.3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}.main-nav ul{display:flex;padding:0;margin:0;min-width:max-content;width:max-content;flex-wrap:nowrap;align-items:center}.main-nav li{width:auto;text-align:center;flex-shrink:0}.main-nav li a{color:#495057;text-decoration:none;font-size:11px;font-weight:500;padding:3px 6px;border-radius:4px;transition:all .2s ease;display:block;white-space:nowrap;background:#00000005;border:1px solid transparent;min-width:55px;flex-shrink:0;line-height:1.2}.main-nav li a:hover{color:#1a73e8;background-color:#1a73e814;border-color:#1a73e833}.main-nav li a.active{color:#1a73e8;font-weight:600;background-color:#1a73e81a;border-color:#1a73e84d;position:relative}.main-nav li a.active:after{content:"";position:absolute;bottom:-2px;left:50%;transform:translate(-50%);width:20px;height:2px;background-color:#1a73e8;border-radius:1px}.header::-webkit-scrollbar{display:none}.header h1{font-size:18px;margin:0;font-weight:600;color:#333;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.header-content{display:flex;align-items:center;gap:8px;flex-shrink:0;min-width:max-content}.header-row-1{display:flex;align-items:center;justify-content:space-between;width:100%}.header-left{flex-shrink:0;display:flex;align-items:center;gap:8px}.header-left h1{font-size:16px;margin:0;font-weight:600;color:#333;white-space:nowrap}.header-left .subtitle{font-size:11px;color:#666;margin:0;white-space:nowrap}.header-right{flex-shrink:0;display:flex;align-items:center;gap:8px}.header-row-2{display:flex;align-items:center;justify-content:flex-start;width:100%;overflow-x:auto;overflow-y:hidden;scrollbar-width:none;-ms-overflow-style:none;padding-top:4px;border-top:1px solid rgba(0,0,0,.06);-webkit-overflow-scrolling:touch;scroll-behavior:smooth}.header-row-2::-webkit-scrollbar{display:none}.header-nav{display:flex;justify-content:flex-start;min-width:max-content;padding-left:8px;width:100%}.main-nav{width:100%;overflow-x:auto;overflow-y:hidden;scrollbar-width:none;-ms-overflow-style:none;-webkit-overflow-scrolling:touch;position:relative}.main-nav::-webkit-scrollbar{display:none}.login-button,.user-center-button{background-color:#1a73e8;color:#fff;border:none;padding:8px 16px;border-radius:8px;cursor:pointer;font-size:13px;font-weight:500;transition:all .2s ease;white-space:nowrap;flex-shrink:0}.login-button:hover,.user-center-button:hover{background-color:#1558b7;transform:translateY(-1px);box-shadow:0 2px 4px #00000026}.user-center-button{background-color:#2ecc71}.user-center-button:hover{background-color:#27ae60}.header-back-button{background:none;border:none;font-size:18px;color:#333;cursor:pointer;padding:6px;margin:-6px;flex-shrink:0;border-radius:6px;transition:background-color .2s ease}.header-back-button:hover{background-color:#0000000d}.header-title{font-size:16px;font-weight:600;color:#333;white-space:nowrap;flex-shrink:0;padding:0 8px}.header-actions{display:flex;align-items:center;gap:6px;flex-shrink:0;margin-left:auto}.header-action-btn{background:none;border:none;font-size:18px;color:#333;cursor:pointer;padding:6px;margin:-6px;transition:all .2s ease;flex-shrink:0;border-radius:6px}.header-action-btn:hover{color:#007bff;background-color:#007bff1a}.header-action-btn:hover{color:#007bff}.main-content{padding:16px 12px;margin-bottom:60px}.card{margin:12px 0;border-radius:12px;box-shadow:0 2px 8px #0000001a;background:#fff}.card-header{padding:16px;border-bottom:1px solid #f0f0f0}.card-content{padding:16px}.question-list-container{padding:0;margin:0}.question-card{background:#fff;margin:8px 12px;padding:16px;border-radius:12px;box-shadow:0 2px 8px #00000014;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease}.question-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000001f}.question-card:active{transform:translateY(0)}.question-title{font-size:16px;font-weight:600;color:#333;margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.question-description{font-size:14px;color:#666;line-height:1.5;margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.question-meta{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#999}.question-tags{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:8px}.question-tag{padding:4px 8px;font-size:11px;color:#007bff;background:#e3f2fd;border-radius:12px;white-space:nowrap}.loading-container{display:flex;justify-content:center;align-items:center;padding:40px 0}.loading-spinner{width:32px;height:32px;border:3px solid #f3f3f3;border-top:3px solid #007bff;border-radius:50%;animation:spin 1s linear infinite}.empty-state{text-align:center;padding:60px 20px;color:#666}.empty-icon{font-size:48px;color:#ccc;margin-bottom:16px}.empty-text{font-size:16px;margin-bottom:8px}.empty-subtext{font-size:14px;color:#999}.list-item{background:#fff;margin:8px 12px;padding:16px;border-radius:12px;box-shadow:0 2px 8px #00000014;cursor:pointer;transition:all .2s ease}.list-item:hover{transform:translateY(-1px);box-shadow:0 4px 12px #0000001f}.list-item:last-child{margin-bottom:80px}.btn{min-height:44px;padding:12px 24px;font-size:16px;border-radius:8px;border:none;box-shadow:0 2px 4px #0000001a}.btn-primary{background:#007bff;color:#fff}.input-group input{font-size:16px;padding:12px 16px;border-radius:8px;border:1px solid #ddd;background:#fff}.login-container{padding:20px 16px;min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#f5f7fa,#c3cfe2)}.login-form{width:100%;max-width:360px;padding:32px 24px;border-radius:20px;background:#fff;box-shadow:0 20px 60px #0000001a;border:1px solid rgba(0,0,0,.04)}.login-method-tabs{display:flex;margin-bottom:24px;border-bottom:1px solid #eee}.method-tab-btn{flex:1;padding:12px 8px;font-size:14px;border:none;background:none;border-bottom:2px solid transparent}.method-tab-btn.active{border-bottom-color:#007bff;color:#007bff;font-weight:600}.question-detail.mobile-view{padding:16px 12px}.question-detail.mobile-view .question-title{font-size:20px;font-weight:600;margin-bottom:16px;line-height:1.4}.question-detail.mobile-view .question-content{font-size:16px;line-height:1.6;color:#333}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid #eee;display:flex;justify-content:space-around;padding:8px 0;box-shadow:0 -2px 8px #0000001a}.nav-item{flex:1;text-align:center;padding:8px 4px;background:none;border:none;cursor:pointer;transition:all .3s ease;display:flex;flex-direction:column;align-items:center;gap:4px}.nav-icon{font-size:20px;margin-bottom:2px;transition:transform .3s ease}.nav-label{font-size:11px;color:#86909c;font-weight:500;transition:color .3s ease}.nav-item.active .nav-icon{transform:scale(1.1)}.nav-item.active .nav-label{color:#007bff;font-weight:600}.nav-item:hover .nav-icon{transform:scale(1.05)}.scroll-container{-webkit-overflow-scrolling:touch;overscroll-behavior-y:contain}.header,.mobile-simple-header{-webkit-overflow-scrolling:touch;scroll-behavior:smooth;scroll-snap-type:x mandatory}.header-content,.mobile-simple-header>*{scroll-snap-align:start}.main-nav{-webkit-overflow-scrolling:touch;scroll-behavior:smooth;scroll-snap-type:x mandatory}.main-nav li{scroll-snap-align:start}.header:after,.mobile-simple-header:after{content:"";position:absolute;right:0;top:50%;transform:translateY(-50%);width:20px;height:20px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.8));pointer-events:none;opacity:0;transition:opacity .3s ease}.header.can-scroll:after,.mobile-simple-header.can-scroll:after{opacity:1}.category-selector{background:#fff;margin:12px 0;border-radius:12px;box-shadow:0 2px 8px #0000001a;overflow:hidden}.category-header{padding:16px;border-bottom:1px solid #f0f0f0;display:flex;justify-content:space-between;align-items:center}.category-title{font-size:16px;font-weight:600;color:#333}.category-toggle{background:none;border:none;font-size:18px;color:#666;cursor:pointer;transition:transform .3s ease}.category-toggle.expanded{transform:rotate(180deg)}.category-content{max-height:0;overflow:hidden;transition:max-height .3s ease}.category-content.expanded{max-height:400px;overflow-y:auto}.category-list{padding:0;margin:0}.category-item{padding:12px 16px;border-bottom:1px solid #f0f0f0;cursor:pointer;transition:background-color .2s ease}.category-item:hover{background-color:#f8f9fa}.category-item.active{background-color:#e3f2fd;color:#007bff;font-weight:600}.category-item:last-child{border-bottom:none}.subcategory-list{margin-left:16px;border-left:2px solid #e0e0e0}.subcategory-item{padding:8px 16px;font-size:14px;color:#666}.subcategory-item.active{color:#007bff;font-weight:600}.search-box{position:sticky;top:0;z-index:100;background:#fff;padding:12px;box-shadow:0 2px 4px #0000001a}.search-input{width:100%;padding:12px 16px 12px 40px;font-size:16px;border:none;border-radius:24px;background:#f5f5f5;transition:all .3s ease;font-weight:500}.search-input:focus{background:#fff;box-shadow:0 0 0 4px #007bff1a;outline:none}pre{font-size:14px;line-height:1.4;overflow-x:auto;border-radius:8px;margin:12px 0}.tag{padding:4px 8px;font-size:12px;border-radius:12px;margin:2px}.comment-item{padding:12px;margin-bottom:8px;border-radius:8px;background:#f8f9fa}input,textarea,select{font-size:16px!important}.touch-feedback{-webkit-tap-highlight-color:transparent;transition:all .2s cubic-bezier(.4,0,.2,1)}.touch-feedback:active{transform:scale(.96)}.question-card:hover,.mobile-question-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px #0000001f}.btn:hover{transform:translateY(-2px);box-shadow:0 4px 16px #007bff4d}.mobile-question-list{min-height:100vh;background:#f5f5f5;overflow-x:hidden;position:relative}body{overflow-x:hidden;margin:0;padding:0}.mobile-content-area{display:block;width:100%;min-height:100vh;background:#f5f5f5}.question-list-mobile-header{padding:10px 14px 6px;background:#f5f5f5f5;box-shadow:none;display:flex;align-items:center;gap:10px;position:sticky;top:48px;z-index:90}.question-list-mobile-header::-webkit-scrollbar{display:none}.question-list-mobile-menu-toggle{background:none;border:none;font-size:16px;color:#475569;cursor:pointer;padding:8px;margin:0;flex-shrink:0;border-radius:10px;background:#fff;border:1px solid #e2e8f0;transition:background-color .2s ease}.question-list-mobile-menu-toggle:hover{background-color:#f8fafc}.question-list-mobile-title{font-size:14px;font-weight:600;color:#334155;margin:0;flex-shrink:0;padding:0}.question-list-mobile-current-category{font-size:12px;color:#64748b;margin-top:0;flex-shrink:0;padding:0 14px}.question-list-mobile-category-display{margin-top:6px}.mobile-current-category-display{padding:20px;background:#f8f9fa;border-bottom:1px solid #eee}.mobile-current-category-name{font-size:14px;color:#666;font-weight:500}.mobile-drawer-title{display:flex;align-items:center;justify-content:space-between;width:100%}.mobile-subcategories{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px;padding:0 20px}.mobile-subcategory-btn{padding:6px 12px;font-size:12px;border:1px solid #e0e0e0;border-radius:16px;background:#fff;color:#666;cursor:pointer;transition:all .2s ease;white-space:nowrap}.mobile-subcategory-btn:hover{background:#f5f5f5;border-color:#007bff;color:#007bff}.mobile-subcategory-btn.active{background:#007bff;color:#fff;border-color:#007bff}.mobile-questions-container{padding:12px 0;margin-bottom:60px}.mobile-questions-list{padding:0 12px}.mobile-question-card{background:#fff;margin:8px 12px;padding:16px;border-radius:12px;box-shadow:0 2px 8px #00000014;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease;display:block;text-decoration:none}.mobile-question-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000001f}.mobile-question-card:active{transform:translateY(0)}.mobile-question-header{display:flex;align-items:flex-start;gap:8px;margin-bottom:8px}.mobile-level-badge{padding:4px 8px;border-radius:12px;font-size:11px;font-weight:600;color:#fff;flex-shrink:0}.mobile-level-badge.level-1{background:#52c41a}.mobile-level-badge.level-2{background:#faad14}.mobile-level-badge.level-3{background:#f5222d}.mobile-level-badge.level-4{background:#722ed1}.mobile-question-title{font-size:16px;font-weight:600;color:#333;line-height:1.4;margin:0;flex:1}.mobile-question-content{font-size:14px;color:#666;line-height:1.5;margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.mobile-question-footer{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:8px}.mobile-question-stats{display:flex;gap:12px;font-size:12px;color:#999}.mobile-question-tags{display:flex;flex-wrap:wrap;gap:4px}.mobile-tag{padding:2px 6px;font-size:11px;color:#007bff;background:#e3f2fd;border-radius:10px}.mobile-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 0}.mobile-spinner{width:32px;height:32px;border:3px solid #f3f3f3;border-top:3px solid #007bff;border-radius:50%;animation:spin 1s linear infinite;margin-bottom:8px}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.mobile-empty{text-align:center;padding:60px 20px;color:#666}.mobile-empty-icon{font-size:48px;color:#ccc;margin-bottom:16px}.mobile-category-drawer{position:fixed;top:0;left:-280px;width:280px;height:100vh;background:#fff;box-shadow:2px 0 8px #0000001a;z-index:1000;transition:left .3s ease;overflow-y:auto}.mobile-category-drawer.open{left:0}.mobile-drawer-header{display:flex;justify-content:space-between;align-items:center;padding:16px;border-bottom:1px solid #eee}.mobile-module-switcher{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;padding:14px 16px 8px;border-bottom:1px solid #eef2f7;background:linear-gradient(180deg,#fff,#f8fbff)}.mobile-module-chip{flex:0 0 112px;max-width:112px;border:1px solid #dbeafe;border-radius:14px;background:#f8fbff;padding:12px;display:flex;flex-direction:column;gap:4px;text-align:left;color:#334155}.mobile-module-chip.active{background:linear-gradient(135deg,#eff6ff,#dbeafe);border-color:#60a5fa;box-shadow:0 10px 18px #3b82f624}.mobile-module-chip-title{display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:700}.mobile-module-chip-meta{font-size:12px;color:#64748b}.mobile-drawer-close{background:none;border:none;font-size:20px;color:#666;cursor:pointer;padding:4px}.mobile-drawer-content{padding:8px 0 16px}.mobile-category-item{width:100%;padding:13px 16px;border:none;background:none;text-align:left;font-size:15px;font-weight:600;color:#334155;cursor:pointer;transition:background-color .2s ease}.mobile-category-item:hover{background-color:#f5f5f5}.mobile-category-item.active{background:linear-gradient(135deg,#eff6ff,#dbeafe);color:#2563eb;font-weight:700}.mobile-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;z-index:999}.mobile-category-group{margin:0 10px 10px;border:1px solid #e2e8f0;border-radius:14px;overflow:hidden;background:#fff}.mobile-category-group:last-child{border-bottom:none}.mobile-subcategory-group{background-color:#f8fafc;border-left:3px solid #007bff}.mobile-subcategory-item{width:100%;padding:10px 16px 10px 28px;border:none;background:none;text-align:left;font-size:14px;color:#64748b;cursor:pointer;transition:background-color .2s ease;border-bottom:1px solid #e9ecef}.mobile-subcategory-item:hover{background-color:#e9ecef}.mobile-subcategory-item.active{background-color:#eff6ff;color:#2563eb;font-weight:700}.mobile-subcategory-item:last-child{border-bottom:none}.mobile-load-more{display:flex;flex-direction:column;align-items:center;margin:2rem 0;padding:1rem;gap:1rem}.mobile-load-more-btn{background:linear-gradient(135deg,#3b82f6,#1d4ed8);color:#fff;border:none;border-radius:50px;padding:1rem 1.5rem;font-size:1rem;font-weight:600;cursor:pointer;transition:all .4s cubic-bezier(.4,0,.2,1);display:flex;align-items:center;gap:.75rem;box-shadow:0 8px 20px #3b82f64d;position:relative;overflow:hidden;min-width:120px;justify-content:center}.mobile-load-more-btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left .5s}.mobile-load-more-btn:hover:before{left:100%}.mobile-load-more-btn:hover:not(:disabled){background:linear-gradient(135deg,#2563eb,#1e40af);transform:translateY(-2px);box-shadow:0 12px 30px #3b82f666}.mobile-load-more-btn:disabled{background:linear-gradient(135deg,#9ca3af,#6b7280);cursor:not-allowed;transform:none;box-shadow:0 4px 12px #9ca3af4d}.mobile-load-more-spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top:2px solid white;border-radius:50%;animation:spin 1s linear infinite}.mobile-total-info{color:#6b7280;font-size:.875rem;text-align:center}.mobile-all-loaded{display:flex;flex-direction:column;align-items:center;margin:2rem 0;padding:1rem;gap:1rem;text-align:center}.mobile-all-loaded-icon{font-size:1.5rem;margin-bottom:.5rem}.mobile-all-loaded p{color:#6b7280;font-size:.875rem;margin:0;font-weight:500}.mobile-all-loaded .mobile-total-info{color:#9ca3af;font-size:.75rem}.question-detail.mobile-view{padding:0!important;margin:0!important;max-width:100%!important;background-color:#f5f5f5!important;min-height:100vh!important}.detail-container.mobile-container{display:block!important;grid-template-columns:none!important;gap:0!important;margin:0!important;max-width:100%!important;width:100%!important}.question-detail.mobile-view .left-sidebar{display:none!important}.question-detail.mobile-view .question-metadata-bar{padding:.75rem 1rem!important;margin:1rem 0!important;gap:.5rem!important}.question-detail.mobile-view .metadata-left,.question-detail.mobile-view .metadata-right{gap:.5rem!important}.question-detail.mobile-view .metadata-item{padding:.3rem .5rem!important;font-size:.75rem!important}.question-detail.mobile-view .metadata-icon{font-size:.85rem!important}.question-detail.mobile-view .metadata-text{font-size:.7rem!important}.question-detail.mobile-view .metadata-count{font-size:.75rem!important}.question-detail.mobile-view .category-tag-compact,.question-detail.mobile-view .level-badge-compact{padding:.3rem .5rem!important;font-size:.7rem!important}.question-detail.mobile-view .question-meta{gap:.3rem!important;margin-bottom:.5rem!important}.question-detail.mobile-view .category-tag,.question-detail.mobile-view .level-badge{padding:.25rem .5rem!important;border-radius:6px!important;font-size:.65rem!important}.question-detail.mobile-view .meta-panel{background:transparent!important;border-radius:0!important;padding:.5rem .75rem!important;border:none!important;box-shadow:none!important;border-bottom:1px solid #e2e8f0!important;margin-bottom:.5rem!important;background-image:none!important;width:100%!important}.question-detail.mobile-view .question-stats{display:flex!important;flex-direction:column!important;gap:.3rem!important;margin:.5rem 0 .25rem!important}.question-detail.mobile-view .stat-item{display:flex!important;align-items:center!important;justify-content:space-between!important;padding:.3rem .5rem!important;background:#f8fafc!important;border-radius:4px!important;border:1px solid #e2e8f0!important;margin:0!important}.question-detail.mobile-view .stat-icon{font-size:.8rem!important;width:1.2rem!important;text-align:center!important}.question-detail.mobile-view .stat-label{font-size:.7rem!important;flex:1!important;text-align:left!important;margin-left:.5rem!important}.question-detail.mobile-view .stat-value{font-size:.75rem!important;font-weight:600!important;min-width:auto!important}.question-detail.mobile-view .tags-section,.question-detail.mobile-view .companies-section{margin:.5rem 0!important;padding:0!important}.question-detail.mobile-view .tags-section h4,.question-detail.mobile-view .companies-section h4{font-size:.7rem!important;margin-bottom:.25rem!important;color:#64748b!important;font-weight:600!important}.question-detail.mobile-view .tags-list{display:flex!important;flex-wrap:wrap!important;gap:.25rem!important}.question-detail.mobile-view .tag{background:#e3f2fd!important;color:#007bff!important;padding:.15rem .4rem!important;border-radius:8px!important;font-size:.65rem!important;border:none!important;background-image:none!important;-webkit-background-clip:unset!important;-webkit-text-fill-color:unset!important;background-clip:unset!important}.question-detail.mobile-view .main-content{padding:0!important;margin:0!important;width:100%!important;max-width:100%!important}.question-detail.mobile-view .question-section{background:#fff!important;border-radius:0!important;padding:1rem!important;box-shadow:none!important;border:none!important;margin:0!important;width:100%!important}.question-detail.mobile-view .question-title{font-size:1.375rem!important;font-weight:700!important;color:#1e293b!important;margin-bottom:1rem!important;line-height:1.4!important;background:transparent!important;border-radius:0!important;box-shadow:none!important;border:none!important;-webkit-background-clip:unset!important;-webkit-text-fill-color:unset!important;background-clip:unset!important;padding:0!important}.question-detail.mobile-view .content-section{background:transparent!important;border-radius:0!important;padding:0!important;box-shadow:none!important;border:none!important;margin-bottom:1rem!important}.question-detail.mobile-view .description-text{background:#f8fafc!important;padding:1rem!important;border-radius:8px!important;border:1px solid #e2e8f0!important;margin-bottom:1rem!important;line-height:1.6!important;font-size:1rem!important;color:#374151!important;width:100%!important;box-sizing:border-box!important}.question-detail.mobile-view .answer-section{background:#fff!important;border-radius:8px!important;border:1px solid #e2e8f0!important;margin:1rem 0!important;overflow:hidden!important;width:100%!important}.question-detail.mobile-view .answer-header{background:#f8fafc!important;padding:1rem!important;border-bottom:1px solid #e2e8f0!important;cursor:pointer!important;display:flex!important;justify-content:space-between!important;align-items:center!important}.question-detail.mobile-view .answer-header h3{margin:0!important;font-size:1.125rem!important;color:#374151!important;font-weight:600!important}.question-detail.mobile-view .toggle-btn{background:none!important;border:none!important;color:#6b7280!important;cursor:pointer!important;font-size:.875rem!important;display:flex!important;align-items:center!important;gap:.5rem!important}.question-detail.mobile-view .answer-content{padding:1rem!important;width:100%!important;box-sizing:border-box!important}.question-detail.mobile-view .answer-content.collapsed{display:none!important}.question-detail.mobile-view .comments-section{background:#fff!important;border-radius:8px!important;border:1px solid #e2e8f0!important;padding:1rem!important;margin:1rem 0!important;width:100%!important;box-sizing:border-box!important}.question-detail.mobile-view .comments-section h3{margin:0 0 1rem!important;font-size:1.125rem!important;color:#374151!important;border-bottom:1px solid #e2e8f0!important;padding-bottom:.5rem!important}.question-detail.mobile-view .comment-form{margin-bottom:1rem!important;padding:0!important;background:transparent!important;border:none!important}.question-detail.mobile-view .comment-input{width:100%!important;padding:.75rem!important;border:1px solid #d1d5db!important;border-radius:6px!important;font-size:1rem!important;resize:vertical!important;box-sizing:border-box!important;min-height:100px!important}.question-detail.mobile-view .submit-btn{background:#3b82f6!important;color:#fff!important;border:none!important;padding:.75rem 1.5rem!important;border-radius:6px!important;font-size:1rem!important;cursor:pointer!important;margin-top:.75rem!important;width:auto!important}.question-detail.mobile-view .comments-list{margin-top:1rem!important}.question-detail.mobile-view .comment-item{border-bottom:1px solid #f3f4f6!important;padding:1rem 0!important;background:transparent!important;border-radius:0!important;margin-bottom:0!important}.question-detail.mobile-view .comment-item:last-child{border-bottom:none!important}.question-detail.mobile-view .comment-header{display:flex!important;justify-content:space-between!important;align-items:center!important;margin-bottom:.5rem!important}.question-detail.mobile-view .comment-author{font-weight:600!important;color:#374151!important;font-size:.875rem!important}.question-detail.mobile-view .comment-time{color:#6b7280!important;font-size:.75rem!important}.question-detail.mobile-view .comment-content{color:#4b5563!important;line-height:1.5!important;font-size:.875rem!important;margin-bottom:.5rem!important}.question-detail.mobile-view .comment-likes{display:flex!important;align-items:center!important;gap:.25rem!important;color:#6b7280!important;font-size:.875rem!important;cursor:pointer!important}.md-h1,.md-h2,.md-h3{margin:1rem 0 .5rem!important;font-size:1rem!important;color:#374151!important;font-weight:600!important}.md-p{margin:.5rem 0!important;line-height:1.6!important;color:#4b5563!important;font-size:.9375rem!important}.md-code-inline{background:#f3f4f6!important;padding:.125rem .25rem!important;border-radius:4px!important;font-family:Monaco,Menlo,Ubuntu Mono,monospace!important;font-size:.875rem!important;color:#374151!important}.md-code-block{background:#f8fafc!important;padding:1rem!important;border-radius:6px!important;border:1px solid #e2e8f0!important;overflow-x:auto!important;font-family:Monaco,Menlo,Ubuntu Mono,monospace!important;font-size:.875rem!important;margin:.5rem 0!important;line-height:1.5!important}.md-pre{margin:0!important;background:transparent!important;border:none!important;padding:0!important}.md-ul,.md-ol{margin:.5rem 0!important;padding-left:1.5rem!important}.md-li{margin:.25rem 0!important;color:#4b5563!important;font-size:.9375rem!important}.md-blockquote{border-left:4px solid #e2e8f0!important;padding-left:1rem!important;margin:.5rem 0!important;color:#6b7280!important;font-style:italic!important;background:#f9fafb!important;border-radius:0 4px 4px 0!important}.md-strong{font-weight:600!important;color:#374151!important}.md-em{font-style:italic!important;color:#4b5563!important}.empty-state{text-align:center!important;padding:2rem 1rem!important;color:#6b7280!important}.empty-state p{margin:0!important;font-size:1rem!important}.loading{text-align:center!important;padding:2rem 1rem!important;color:#6b7280!important}.spinner{width:2rem!important;height:2rem!important;border:2px solid #e2e8f0!important;border-top:2px solid #3b82f6!important;border-radius:50%!important;animation:spin 1s linear infinite!important;margin:0 auto 1rem!important}.question-detail.mobile-view *:before,.question-detail.mobile-view *:after{display:none!important}.question-detail.mobile-view>*{width:100%!important;max-width:100%!important;box-sizing:border-box!important}@media screen and (max-width: 390px){.question-detail.mobile-view .question-title{font-size:1.25rem!important}.question-detail.mobile-view .description-text,.question-detail.mobile-view .answer-content,.question-detail.mobile-view .comments-section{padding:.75rem!important}.question-detail.mobile-view .stat-item{min-width:70px!important;padding:.5rem .25rem!important}}@media (prefers-color-scheme: dark){.question-detail.mobile-view{background-color:#111827!important}.question-detail.mobile-view .meta-panel,.question-detail.mobile-view .question-section,.question-detail.mobile-view .answer-section,.question-detail.mobile-view .comments-section{background:#1f2937!important;border-color:#374151!important}.question-detail.mobile-view .description-text{background:#374151!important;color:#f9fafb!important}.question-detail.mobile-view .question-title{color:#f9fafb!important}}}@media screen and (max-width: 375px){.header{padding:6px 8px;min-height:70px}.question-list-mobile-header{padding:8px 12px 4px;min-height:40px}.header-left h1{font-size:14px}.header-left .subtitle{font-size:10px}.header-title,.question-list-mobile-title{font-size:14px}.header-back-button,.header-action-btn,.question-list-mobile-menu-toggle{font-size:14px;padding:4px;margin:0}.main-nav li a{font-size:12px;padding:4px 8px;min-width:55px;max-width:75px}.login-button,.user-center-button{font-size:11px;padding:5px 10px}.question-list-mobile-current-category{font-size:11px}.login-form{padding:24px 16px}.btn{padding:10px 20px;font-size:14px}.question-title{font-size:18px}.question-content{font-size:14px}}@media screen and (max-width: 768px) and (orientation: landscape){.login-container{padding:10px}.login-form{max-width:400px;padding:20px 16px}.header{padding:8px 16px;height:48px}.header h1{font-size:16px}.mobile-header{padding:8px 16px}.mobile-title{font-size:16px}}@media (prefers-color-scheme: dark){@media screen and (max-width: 768px){.card{background:#1a1a1a;color:#fff}.input-group input{background:#2a2a2a;color:#fff;border-color:#444}.search-input{background:#2a2a2a;color:#fff}}}@media screen and (max-width: 768px) and (prefers-color-scheme: dark){.mobile-nav-container{background:#0f172af5;border-bottom-color:#334155;box-shadow:inset 0 1px #ffffff0a,0 8px 24px #02061757}.mobile-nav-item{color:#cbd5e1}.mobile-nav-item:hover{border-color:#60a5fa47;background:#1e293b8f}.mobile-nav-item.active{color:#dbeafe}.mobile-nav-item.active:after{background:#60a5fa}}*{margin:0;padding:0;box-sizing:border-box;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif}#root{width:100%;min-height:100vh;display:flex;flex-direction:column}.app-container{max-width:1200px;margin:0 auto;padding:10px 20px;display:flex;flex-direction:column;flex:1;width:100%}main{margin-top:10px;flex:1;min-height:70vh}.category-nav{display:flex;flex-direction:column;width:220px;min-width:220px;padding:15px 0;background-color:#f8f9fa;border-radius:12px;box-shadow:0 4px 12px #0000000d;position:sticky;top:15px;max-height:calc(100vh - 100px);overflow-y:auto;align-self:flex-start;transition:all .3s ease}.category-nav-header{padding:0 16px 10px;margin-bottom:5px;border-bottom:1px solid #e9ecef}.category-nav-header h3{margin:0;font-size:16px;color:#495057;font-weight:600}.category-arrow{margin-left:5px;font-size:12px}.category-btn{display:flex;align-items:center;padding:10px 16px;margin:2px 8px;border:none;border-radius:8px;background-color:transparent;cursor:pointer;transition:all .2s ease;text-align:left;font-size:15px;font-weight:500}.category-btn:hover{background-color:#0000000d;transform:translate(3px)}.category-btn.active{font-weight:600}.category-icon{font-size:18px;margin-right:12px;display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px}.category-name{flex:1}.main-content{display:flex;flex-direction:column;flex:0 0 calc(100% - 240px);width:calc(100% - 240px);max-width:960px;min-width:calc(100% - 240px)}.subcategory-nav{background-color:#fff;border-radius:12px;box-shadow:0 4px 12px #0000000d;padding:16px 20px;margin-bottom:20px;width:100%;transition:all .3s ease}.subcategory-header{display:flex;width:100%;align-items:center;margin-bottom:15px}.subcategory-header h2{font-size:20px;margin:0 0 0 12px;font-weight:600;color:#333}.subcategory-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.subcategory-tab{padding:8px 16px;border:1px solid #e9ecef;border-radius:24px;background-color:transparent;cursor:pointer;transition:all .2s ease;font-size:14px;font-weight:500}.subcategory-tab:hover{background-color:#f8f9fa;transform:translateY(-2px)}.subcategory-tab.active{background-color:#007bff;color:#fff;border-color:#007bff;box-shadow:0 2px 8px #007bff4d}.third-category-nav{background-color:#fff;border-radius:12px;box-shadow:0 4px 12px #0000000d;padding:16px 20px;margin-bottom:20px;width:100%;transition:all .3s ease}.third-category-header{display:flex;width:100%;align-items:center;margin-bottom:15px;gap:12px}.third-category-header .subcategory-name{font-weight:600;color:#007bff;font-size:16px}.third-category-header .third-category-label{color:#6c757d;font-size:14px;font-weight:500}.third-category-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.third-category-tab{padding:6px 14px;border:1px solid #e9ecef;border-radius:20px;background-color:transparent;cursor:pointer;transition:all .2s ease;font-size:13px;font-weight:500;color:#495057}.third-category-tab:hover{background-color:#f8f9fa;transform:translateY(-1px);border-color:#007bff}.third-category-tab.active{background-color:#007bff;color:#fff;border-color:#007bff;box-shadow:0 2px 6px #007bff4d}.topic-tags{display:flex;flex-direction:column;gap:8px;margin-top:12px;padding-top:12px;border-top:1px solid #f1f3f5}.topic-tags-header{display:flex;align-items:center;gap:8px;color:#495057;font-weight:500;font-size:14px}.topic-tags-container{display:flex;flex-wrap:wrap;gap:8px}.topic-tag{background-color:#f1f3f5;color:#495057;padding:6px 12px;border-radius:6px;font-size:13px;transition:all .2s ease;display:flex;align-items:center;gap:5px}.topic-tag i{color:#6c757d;font-size:11px}.topic-tag:hover{background-color:#e9ecef;transform:translateY(-2px);box-shadow:0 2px 5px #0000000d}.questions-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;width:100%}.question-card{background-color:#fff;border-radius:12px;padding:20px;box-shadow:0 4px 12px #0000000d;transition:transform .3s,box-shadow .3s;border:1px solid #f1f3f5;display:flex;flex-direction:column;height:100%}.question-card:hover{transform:translateY(-5px);box-shadow:0 8px 24px #0000001a}.question-meta{display:flex;justify-content:space-between;margin-bottom:16px}.category-tag{background-color:#e9ecef;color:#495057;padding:5px 10px;border-radius:6px;font-size:12px;font-weight:500}.level-badge{padding:5px 10px;border-radius:6px;font-size:12px;color:#fff;font-weight:500}.level-0{background-color:#28a745}.level-1{background-color:#fd7e14}.level-2{background-color:#dc3545}.question-card h3{margin:0 0 16px;font-size:18px;color:#212529;line-height:1.4;font-weight:600}.question-card-content{color:#6c757d;font-size:14px;margin-bottom:20px;line-height:1.6;flex-grow:1}.question-stats{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:20px;font-size:13px;color:#6c757d}.question-stats span{display:flex;align-items:center}.question-stats span i{margin-right:6px}.question-tags,.company-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.label-tag{background-color:#e7f5ff;color:#1971c2;padding:5px 10px;border-radius:6px;font-size:12px;transition:all .2s ease}.label-tag:hover{background-color:#d0ebff;transform:translateY(-2px)}.company-tag{background-color:#f8f0fc;color:#ae3ec9;padding:5px 10px;border-radius:6px;font-size:12px;transition:all .2s ease}.company-tag:hover{background-color:#f3d9fa;transform:translateY(-2px)}.loading{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px;grid-column:1 / -1}.spinner{width:40px;height:40px;border:4px solid rgba(0,0,0,.1);border-left-color:#007bff;border-radius:50%;animation:spin 1s linear infinite;margin-bottom:20px}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:80px 20px;grid-column:1 / -1;text-align:center}.empty-icon{font-size:60px;margin-bottom:24px;opacity:.7}.empty-state p{color:#6c757d;font-size:18px;font-weight:500}.question-list-container{display:flex;width:100%;gap:20px;min-height:calc(100vh - 100px);padding-top:5px;justify-content:flex-start;margin:0 auto}.header{display:flex;justify-content:space-between;align-items:center;padding:15px 0;border-bottom:1px solid #e9ecef;margin-bottom:20px;gap:24px;min-width:0}.header-left{display:flex;flex-direction:column;flex:0 0 auto;min-width:0}.header-left h1{font-size:24px;font-weight:700;color:#1a73e8;margin:0}.subtitle{font-size:14px;color:#6c757d;white-space:nowrap}.header-nav{flex:1;display:flex;justify-content:flex-start;min-width:0;overflow:hidden;scrollbar-width:none;-ms-overflow-style:none}.header-nav::-webkit-scrollbar{display:none}.main-nav{display:flex;justify-content:flex-start;width:100%;min-width:0;overflow-x:auto;overflow-y:hidden;scrollbar-width:none;-ms-overflow-style:none}.main-nav::-webkit-scrollbar{display:none}.main-nav ul{display:flex;list-style:none;gap:.9rem;align-items:center;justify-content:flex-start;flex-wrap:nowrap;min-width:max-content;width:max-content;margin:0;padding:0}.main-nav li{flex:0 0 auto;min-width:0;text-align:center}.main-nav li a{color:#495057;text-decoration:none;font-size:1rem;font-weight:500;padding:.5rem .75rem;border-radius:4px;transition:all .3s ease;display:block;width:auto;white-space:nowrap}.main-nav li a i{margin-right:6px}html[lang=en] .main-nav li a{font-size:.94rem;padding:.46rem .62rem}html[lang=en] .header{gap:16px}html[lang=en] .header-left{flex:0 0 220px}html[lang=en] .subtitle{max-width:260px;overflow:hidden;text-overflow:ellipsis}html[lang=en] .main-nav ul{gap:.7rem}html[lang=en] .header-nav{padding:0 6px}html[lang=en] .main-nav li a .fa-book-reader{display:none}.main-nav li a:hover{color:#1a73e8;background-color:#1a73e814}.main-nav li a.active{color:#1a73e8;font-weight:600;position:relative}.main-nav li a.active:after{content:"";position:absolute;bottom:-4px;left:0;width:100%;height:2px;background-color:#1a73e8;border-radius:2px}.app-mobile-nav-header{position:relative;min-height:48px;z-index:1000}.mobile-nav-theme-toggle{background:transparent;color:inherit;font:inherit}.mobile-nav-theme-toggle.active{color:#007bff}.header-right{display:flex;align-items:center;gap:12px;flex:0 0 auto;min-width:0;justify-content:flex-end}.header-utilities{display:flex;align-items:center;gap:10px;flex:0 0 auto;min-width:0}.header-account{display:flex;align-items:center;justify-content:flex-end;flex:0 0 auto;min-width:0}.header-right .user-info-container{display:flex;align-items:center}.login-button{background-color:#1a73e8;color:#fff;border:none;min-height:40px;padding:0 16px;border-radius:12px;cursor:pointer;font-size:14px;font-weight:700;transition:all .2s;white-space:nowrap;flex:0 0 auto}.login-button:hover{background-color:#1558b7;transform:translateY(-2px);box-shadow:0 2px 5px #0000001a}.user-center-button{background-color:#2ecc71;color:#fff;border:none;padding:8px 16px;border-radius:4px;cursor:pointer;font-size:14px;transition:all .2s;white-space:nowrap}.user-center-button:hover{background-color:#27ae60;transform:translateY(-2px);box-shadow:0 2px 5px #0000001a}.footer{margin-top:3rem;padding:1.5rem 0;text-align:center;border-top:1px solid #eaeaea;color:#666;font-size:.9rem}.footer-content{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:2rem}.footer-language{display:flex;align-items:center;justify-content:center}.footer a{color:#1a73e8;text-decoration:none}.footer a:hover{text-decoration:underline}.icp-info,.contact-info{display:flex;align-items:center;justify-content:center}.icp-link{display:flex;align-items:center;gap:.5rem}.icp-icon{height:16px;margin-right:4px}.email-link{display:flex;align-items:center;gap:.5rem;padding:.5rem 1rem;background-color:#f1f3f4;border-radius:20px;transition:all .2s ease}.email-link:hover{background-color:#e8eaed;transform:translateY(-2px);box-shadow:0 2px 5px #0000001a;text-decoration:none}.email-link i{color:#1a73e8}.category-nav{display:flex;justify-content:center;gap:1rem;flex-wrap:wrap;margin-bottom:2rem}.category-btn{padding:.75rem 1.5rem;border:none;background-color:#f5f5f5;border-radius:30px;cursor:pointer;font-size:1rem;transition:all .3s ease}.category-btn:hover{background-color:#e0e0e0}.category-btn.active{background-color:#1a73e8;color:#fff}.question-list{flex:1}.question-list h2{margin-bottom:1.5rem;font-size:1.8rem;color:#333;border-bottom:2px solid #1a73e8;padding-bottom:.5rem;display:inline-block}.question-list ul{list-style:none}.question-item{background-color:#fff;border-radius:8px;padding:1.5rem;margin-bottom:1rem;box-shadow:0 2px 10px #0000000d;display:flex;justify-content:space-between;align-items:center;transition:transform .2s ease}.question-item:hover{transform:translateY(-3px);box-shadow:0 4px 15px #0000001a}.question-item h3{font-size:1.1rem;color:#333;margin-right:1rem;flex:1}.view-btn{background-color:#1a73e8;color:#fff;border:none;padding:.5rem 1rem;border-radius:4px;cursor:pointer;font-size:.9rem;white-space:nowrap}.view-btn:hover{background-color:#1558b7}.empty-state{text-align:center;color:#888;padding:3rem 0}@media (max-width: 768px){.category-nav{flex-direction:row;overflow-x:auto;padding-bottom:.5rem}.question-item{flex-direction:column;align-items:flex-start}.question-item h3{margin-bottom:1rem;margin-right:0}}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem}.modal-content{background:#fff;border-radius:.5rem;padding:2rem;width:100%;max-width:400px;box-shadow:0 10px 25px #0000001a;position:relative}.modal-close{position:absolute;top:1rem;right:1rem;background:none;border:none;font-size:1.5rem;cursor:pointer;color:#6b7280}.auth-tabs{display:flex;background-color:#f3f4f6;border-radius:.5rem;padding:.25rem;margin-bottom:2rem}.tab-btn{flex:1;padding:.75rem 1rem;background:none;border:none;border-radius:.375rem;font-size:.875rem;font-weight:600;color:#6b7280;cursor:pointer;transition:all .3s ease}.tab-btn.active{background-color:#fff;color:#3b82f6;box-shadow:0 1px 3px #0000001a,0 1px 2px #0000000f}.login-method-tabs{display:flex;background-color:#f9fafb;border-radius:.375rem;padding:.25rem;margin-bottom:2rem}.method-tab-btn{flex:1;padding:.5rem 1rem;background:none;border:none;border-radius:.25rem;font-size:.875rem;color:#6b7280;cursor:pointer;transition:all .3s ease;text-align:center}.method-tab-btn.active{background-color:#fff;color:#3b82f6;box-shadow:0 1px 2px #0000000d}.auth-form{margin-top:1.5rem}.form-group{margin-bottom:1.5rem;position:relative}.form-group input{width:100%;padding:.75rem 1rem;border:1px solid #e5e7eb;border-radius:.375rem;font-size:1rem;background-color:#f9fafb;transition:border-color .3s ease}.form-group input:focus{outline:none;border-color:#3b82f6;background-color:#fff}.form-group input::placeholder{color:#9ca3af}.sms-code-group{position:relative}.sms-code-btn{right:1rem;top:50%;background:none;border:none;color:#3b82f6;font-size:.875rem;cursor:pointer}.sms-code-btn:disabled{color:#9ca3af;cursor:not-allowed}.submit-btn{width:100%;padding:.75rem;background-color:#3b82f6;color:#fff;border:none;border-radius:.375rem;font-size:1rem;cursor:pointer;transition:background-color .3s ease}.submit-btn:hover{background-color:#2563eb}.sms-login-tabs{display:flex;margin-bottom:1.5rem;border-bottom:1px solid #e5e7eb}.sms-login-tabs .tab-btn{flex:1;padding:.5rem 1rem;font-size:.9rem}.sms-code-group{display:flex;gap:.5rem;align-items:center}.sms-code-group input{flex:1}.sms-code-group button{padding:.75rem 1rem;background-color:#6b7280;color:#fff;border:none;border-radius:.375rem;font-size:.875rem;cursor:pointer;transition:background-color .3s ease;white-space:nowrap}.sms-code-group button:hover:not(:disabled){background-color:#4b5563}.sms-code-group button:disabled{background-color:#9ca3af;cursor:not-allowed}.main-content{padding:2rem}.questions-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem;margin-top:2rem}.question-card{background:#fff;border:1px solid #e5e7eb;border-radius:.75rem;padding:1.5rem;transition:all .3s ease;box-shadow:0 1px 3px #0000001a,0 1px 2px #0000000f}.question-card:hover{transform:translateY(-2px);box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.question-card h3{font-size:1.125rem;font-weight:600;color:#1f2937;margin-bottom:.75rem;line-height:1.5}.question-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.category-tag{background-color:#dbeafe;color:#1e40af;padding:.25rem .75rem;border-radius:9999px;font-size:.875rem;font-weight:500}.level-badge{background-color:#fee2e2;color:#dc2626;padding:.25rem .75rem;border-radius:9999px;font-size:.75rem;font-weight:500}.question-stats{display:flex;gap:1rem;font-size:.875rem;color:#6b7280}.question-card-content{color:#4b5563;font-size:.875rem;line-height:1.5;margin-bottom:1rem;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.loading{text-align:center;padding:3rem;color:#6b7280;font-size:1.125rem}.user-controls{display:flex;align-items:center;gap:1rem;margin-left:auto}.welcome-text{color:#374151;font-weight:500}.settings-btn,.logout-btn{padding:.5rem 1rem;border:none;border-radius:.375rem;font-size:.875rem;cursor:pointer;transition:all .3s ease}.settings-btn{background-color:#3b82f6;color:#fff}.settings-btn:hover{background-color:#2563eb}.logout-btn{background-color:#ef4444;color:#fff}.logout-btn:hover{background-color:#dc2626}.settings-modal{max-width:500px;width:90%}.settings-header{text-align:center;margin-bottom:2rem;padding-bottom:1rem;border-bottom:1px solid #e5e7eb}.profile-section h3{color:#1f2937;margin-bottom:1.5rem;font-size:1.25rem}.profile-info{background-color:#f9fafb;border-radius:.5rem;padding:1.5rem;margin-bottom:2rem}.info-row{display:flex;justify-content:space-between;align-items:center;padding:.75rem 0;border-bottom:1px solid #e5e7eb}.info-row:last-child{border-bottom:none}.info-row label{font-weight:600;color:#374151;min-width:80px}.info-row span{color:#6b7280}.settings-actions{text-align:center}.settings-actions .logout-btn{padding:.75rem 2rem;font-size:1rem}.loading{text-align:center;padding:3rem;color:#6b7280}.spinner{width:40px;height:40px;border:4px solid #f3f4f6;border-top:4px solid #3b82f6;border-radius:50%;animation:spin 1s linear infinite;margin:0 auto 1rem}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.empty-state{text-align:center;padding:3rem;color:#9ca3af}.empty-icon{font-size:3rem;margin-bottom:1rem}.question-tags{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1rem}.label-tag{background-color:#f3f4f6;color:#374151;padding:.25rem .5rem;border-radius:.375rem;font-size:.75rem}.company-tags{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.5rem}.company-tag{background-color:#dbeafe;color:#1e40af;padding:.25rem .5rem;border-radius:.375rem;font-size:.75rem;font-weight:500}.level-badge.level-0{background-color:#dcfce7;color:#16a34a}.level-badge.level-1{background-color:#fef3c7;color:#d97706}.level-badge.level-2{background-color:#fee2e2;color:#dc2626}@media (max-width: 768px){.questions-grid{grid-template-columns:1fr;gap:1rem}.question-card{padding:1rem}.category-nav{flex-wrap:wrap}.category-btn{padding:.5rem .75rem;font-size:.875rem}}.category-nav-footer{margin-top:2rem;padding-top:1rem;border-top:1px solid #e5e7eb;display:flex;flex-direction:column;gap:.5rem}.category-footer-link{display:flex;align-items:center;margin:2px 8px;padding:10px 16px;color:#6b7280;text-decoration:none;font-size:15px;border-radius:8px;gap:0;transition:all .2s ease}.category-footer-link:hover{background-color:#f3f4f6;color:#374151;transform:translate(2px)}.category-footer-link i{font-size:18px;width:24px;height:24px;margin-right:12px;display:inline-flex;align-items:center;justify-content:center;text-align:center}.footer{margin-top:auto;padding:2rem 0 1rem;background-color:#f9fafb;border-top:1px solid #e5e7eb}.icp-info{text-align:center;color:#6b7280;font-size:.875rem;padding:1rem 0}.icp-link{color:#6b7280;text-decoration:none;display:inline-flex;align-items:center;gap:.5rem;transition:color .2s ease}.icp-link:hover{color:#374151}.icp-icon,.icp-link img{width:16px;height:16px;vertical-align:middle}@media (prefers-color-scheme: dark){.header{border-bottom-color:#334155}.header-left h1{color:#60a5fa}.subtitle,.main-nav li a,.footer,.icp-info,.icp-link,.category-footer-link,.welcome-text,.info-row span,.modal-close{color:#cbd5e1}.main-nav li a:hover{color:#93c5fd;background-color:#3b82f629}.main-nav li a.active{color:#93c5fd}.main-nav li a.active:after{background-color:#60a5fa}.login-button{background:linear-gradient(135deg,#2563eb,#1d4ed8);color:#fff;box-shadow:0 10px 22px #2563eb3d}.login-button:hover{background:linear-gradient(135deg,#1d4ed8,#1e40af)}.modal-content,.settings-modal,.profile-info{background:#111827;color:#e5e7eb;border:1px solid #334155;box-shadow:0 20px 48px #00000073}.auth-tabs,.login-method-tabs{background-color:#1f2937}.tab-btn,.method-tab-btn{color:#94a3b8}.tab-btn.active,.method-tab-btn.active{background-color:#0f172a;color:#93c5fd;box-shadow:0 1px 3px #0f172a73}.form-group input{background-color:#0f172a;border-color:#334155;color:#e5e7eb}.form-group input:focus{background-color:#111827;border-color:#60a5fa}.form-group input::placeholder{color:#64748b}.sms-login-tabs{border-bottom-color:#334155}.settings-header,.info-row,.category-nav-footer,.footer{border-color:#334155}.profile-section h3,.info-row label{color:#f8fafc}.info-row{background:transparent}.category-footer-link:hover,.icp-link:hover{color:#f8fafc;background-color:#94a3b814}.footer{background-color:#0f172a}.email-link{background-color:#1f2937;color:#e5e7eb}.email-link:hover{background-color:#273449;box-shadow:0 8px 24px #00000047}.email-link i{color:#93c5fd}.loading,.empty-state{color:#94a3b8}.spinner{border-color:#94a3b83d;border-top-color:#60a5fa}}html[data-theme=dark] .header{border-bottom-color:#334155b8;background:linear-gradient(180deg,#0f172aeb,#0f172ac7);border-radius:20px;padding:14px 18px;box-shadow:inset 0 1px #ffffff0a,0 18px 42px #02061747}html[data-theme=dark] .header-left h1{color:#93c5fd}html[data-theme=dark] .subtitle,html[data-theme=dark] .main-nav li a,html[data-theme=dark] .footer,html[data-theme=dark] .icp-info,html[data-theme=dark] .icp-link,html[data-theme=dark] .category-footer-link,html[data-theme=dark] .welcome-text,html[data-theme=dark] .info-row span,html[data-theme=dark] .modal-close{color:#cbd5e1}html[data-theme=dark] .main-nav li a:hover{color:#93c5fd;background-color:#1e293bdb}html[data-theme=dark] .main-nav li a.active{color:#dbeafe;background:linear-gradient(180deg,#1e293bf5,#172033f5);box-shadow:inset 0 1px #ffffff08}html[data-theme=dark] .main-nav li a.active:after{background-color:#60a5fa}html[data-theme=dark] .header-nav{padding:0 8px}html[data-theme=dark] .header-right{gap:14px}html[data-theme=dark] .header-utilities{padding:4px;border-radius:999px;background:#0f172ae6;border:1px solid rgba(51,65,85,.72);box-shadow:inset 0 1px #ffffff08}html[data-theme=dark] .header-account{padding-left:2px}html[data-theme=dark] .modal-content,html[data-theme=dark] .settings-modal,html[data-theme=dark] .profile-info{background:#111827;color:#e5e7eb;border:1px solid #334155;box-shadow:0 20px 48px #00000073}html[data-theme=dark] .auth-tabs,html[data-theme=dark] .login-method-tabs{background-color:#1f2937}html[data-theme=dark] .tab-btn,html[data-theme=dark] .method-tab-btn{color:#94a3b8}html[data-theme=dark] .tab-btn.active,html[data-theme=dark] .method-tab-btn.active{background-color:#0f172a;color:#93c5fd;box-shadow:0 1px 3px #0f172a73}html[data-theme=dark] .form-group input{background-color:#0f172a;border-color:#334155;color:#e5e7eb}html[data-theme=dark] .form-group input:focus{background-color:#111827;border-color:#60a5fa}html[data-theme=dark] .form-group input::placeholder{color:#64748b}html[data-theme=dark] .sms-login-tabs{border-bottom-color:#334155}html[data-theme=dark] .settings-header,html[data-theme=dark] .info-row,html[data-theme=dark] .category-nav-footer,html[data-theme=dark] .footer{border-color:#334155}html[data-theme=dark] .profile-section h3,html[data-theme=dark] .info-row label{color:#f8fafc}html[data-theme=dark] .info-row{background:transparent}html[data-theme=dark] .category-footer-link:hover,html[data-theme=dark] .icp-link:hover{color:#f8fafc;background-color:#94a3b814}html[data-theme=dark] .footer{background-color:#0f172a}html[data-theme=dark] .email-link{background-color:#1f2937;color:#e5e7eb}html[data-theme=dark] .email-link:hover{background-color:#273449;box-shadow:0 8px 24px #00000047}html[data-theme=dark] .email-link i{color:#93c5fd}html[data-theme=dark] .loading,html[data-theme=dark] .empty-state{color:#94a3b8}html[data-theme=dark] .spinner{border-color:#94a3b83d;border-top-color:#60a5fa}html[data-theme=dark] .login-button{background:linear-gradient(135deg,#1d4ed8,#2563eb);color:#fff;border:1px solid rgba(96,165,250,.46);box-shadow:inset 0 1px #ffffff14,0 12px 24px #2563eb3d}html[data-theme=dark] .login-button:hover{background:linear-gradient(135deg,#2563eb,#1d4ed8)}html[data-theme=dark] .header-right .user-info-container{padding:3px;border-radius:999px;background:#0f172adb;border:1px solid rgba(51,65,85,.72)}html[data-theme=dark] .mobile-nav-theme-toggle.active{color:#dbeafe}.user-info-container{position:relative;display:flex;align-items:center}.user-avatar-container{cursor:pointer;position:relative;display:flex;align-items:center;justify-content:center}.user-avatar{width:40px;height:40px;border-radius:50%;object-fit:cover;border:2px solid #fff;box-shadow:0 2px 4px #0000001a;transition:transform .2s}.user-avatar:hover{transform:scale(1.05);box-shadow:0 3px 6px #00000026}.user-avatar-placeholder{width:40px;height:40px;border-radius:50%;background-color:#3498db;color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;border:2px solid #fff;box-shadow:0 2px 4px #0000001a;transition:transform .2s}.user-avatar-placeholder:hover{transform:scale(1.05);box-shadow:0 3px 6px #00000026}.user-dropdown{position:absolute;top:50px;right:0;width:250px;background-color:#fff;border-radius:8px;box-shadow:0 4px 12px #00000026;z-index:100;overflow:hidden;animation:fadeIn .2s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.user-dropdown-header{padding:15px;background-color:#f8f9fa;border-bottom:1px solid #eee}.user-dropdown-header h3{margin:0;font-size:16px;color:#333}.user-level{display:inline-block;background-color:#3498db;color:#fff;font-size:12px;padding:2px 8px;border-radius:10px;margin-top:5px}.user-dropdown-info{padding:10px 15px;border-bottom:1px solid #eee}.user-dropdown-info p{margin:5px 0;font-size:14px;color:#666}.user-dropdown-actions{padding:10px 15px;display:flex;flex-direction:column;gap:8px}.user-dropdown-actions button{padding:8px 12px;background-color:#f8f9fa;border:1px solid #ddd;border-radius:4px;cursor:pointer;font-size:14px;transition:background-color .2s}.user-dropdown-actions button:hover{background-color:#e9ecef}.user-dropdown-actions button:last-child{background-color:#f1f1f1;color:#d9534f}.user-dropdown-actions button:last-child:hover{background-color:#f8d7da}html[data-theme=dark] .user-avatar,html[data-theme=dark] .user-avatar-placeholder{border-color:#1f2937;box-shadow:0 8px 18px #00000047}html[data-theme=dark] .user-dropdown{background-color:#111827;border:1px solid #334155;box-shadow:0 20px 48px #0006}html[data-theme=dark] .user-dropdown-header{background-color:#0f172a;border-bottom-color:#334155}html[data-theme=dark] .user-dropdown-header h3{color:#f8fafc}html[data-theme=dark] .user-dropdown-info{border-bottom-color:#334155}html[data-theme=dark] .user-dropdown-info p{color:#cbd5e1}html[data-theme=dark] .user-dropdown-actions button{background-color:#0f172a;border-color:#334155;color:#e5e7eb}html[data-theme=dark] .user-dropdown-actions button:hover{background-color:#172033}html[data-theme=dark] .user-dropdown-actions button:last-child{background-color:#7f1d1d3d;color:#fca5a5}html[data-theme=dark] .user-dropdown-actions button:last-child:hover{background-color:#7f1d1d61}.language-switcher{display:inline-flex;align-items:center;gap:4px;padding:4px;border:1px solid #dbe3ef;border-radius:999px;background-color:#fff;box-shadow:0 2px 10px #0f172a0f}.language-button{border:none;background:transparent;color:#475569;padding:6px 10px;border-radius:999px;font-size:13px;font-weight:600;cursor:pointer;transition:all .2s ease;white-space:nowrap}.language-button:hover{color:#1d4ed8;background-color:#eff6ff}.language-button.active{color:#fff;background-color:#1a73e8;box-shadow:0 2px 6px #1a73e840}.language-switcher.compact .language-button{padding:5px 9px;font-size:12px}html[data-theme=dark] .language-switcher{border-color:transparent;background-color:transparent;box-shadow:none}html[data-theme=dark] .language-button{color:#94a3b8}html[data-theme=dark] .language-button:hover{color:#dbeafe;background-color:#1e293beb}html[data-theme=dark] .language-button.active{color:#fff;background:linear-gradient(135deg,#1d4ed8,#2563eb);box-shadow:inset 0 1px #ffffff14,0 10px 18px #2563eb38}.theme-toggle{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:36px;padding:0 12px;border:1px solid #dbe3ef;border-radius:999px;background:#fff;color:#475569;box-shadow:0 2px 10px #0f172a0f;cursor:pointer;transition:transform .2s ease,border-color .2s ease,background-color .2s ease,color .2s ease,box-shadow .2s ease;white-space:nowrap}.theme-toggle:hover{transform:translateY(-1px);border-color:#bfdbfe;background:#f8fbff;color:#1d4ed8}.theme-toggle.active{border-color:#2563eb;background:linear-gradient(135deg,#2563eb,#1d4ed8);color:#fff;box-shadow:0 8px 18px #2563eb38}.theme-toggle.compact{min-height:34px;padding:0 10px}.theme-toggle-icon{font-size:14px;line-height:1}.theme-toggle-label{font-size:12px;font-weight:700;line-height:1}html[data-theme=dark] .theme-toggle{background:#0f172ab8;border-color:#334155b8;color:#94a3b8;box-shadow:none}html[data-theme=dark] .theme-toggle:hover{border-color:#60a5fa85;background:#1e293beb;color:#dbeafe}html[data-theme=dark] .theme-toggle.active{border-color:#60a5fab8;background:linear-gradient(135deg,#1d4ed8,#2563eb);color:#fff;box-shadow:inset 0 1px #ffffff14,0 10px 18px #2563eb38}