/* =============================================
   AI-Native UI Design System for BadouCMS
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    /* Colors */
    --ai-primary: #7c3aed; /* Vibrant Purple */
    --ai-primary-light: #a78bfa;
    --ai-primary-dark: #5b21b6;
    --ai-secondary: #2563eb; /* Deep Blue */
    --ai-accent: #ec4899; /* Pink Accent */
    
    /* Gradients */
    --ai-gradient-main: linear-gradient(135deg, #7c3aed 0%, #2563eb 100%);
    --ai-gradient-text: linear-gradient(135deg, #7c3aed 0%, #ec4899 100%);
    --ai-gradient-bg: linear-gradient(180deg, #f8fafc 0%, #eff6ff 100%);
    --ai-gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0.1) 100%);
    
    /* Surface */
    --ai-bg-base: #f8fafc;
    --ai-bg-surface: #ffffff;
    --ai-bg-glass: rgba(255, 255, 255, 0.7);
    
    /* Text */
    --ai-text-primary: #0f172a;
    --ai-text-secondary: #475569;
    --ai-text-muted: #94a3b8;
    
    /* Shadows & Effects */
    --ai-shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --ai-shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --ai-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --ai-shadow-glow: 0 0 20px rgba(124, 58, 237, 0.3);
    --ai-shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    
    /* Borders */
    --ai-border-light: rgba(255, 255, 255, 0.5);
    --ai-border-base: #e2e8f0;
    
    /* Geometry */
    --ai-radius-sm: 8px;
    --ai-radius-md: 16px;
    --ai-radius-lg: 24px;
    --ai-radius-pill: 9999px;
    
    /* Animation */
    --ai-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --ai-transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Reset & Base === */
body {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--ai-text-primary);
    background: var(--ai-bg-base);
    background-image: radial-gradient(at 0% 0%, hsla(253,16%,7%,0.05) 0, transparent 50%), radial-gradient(at 50% 0%, hsla(225,39%,30%,0.05) 0, transparent 50%), radial-gradient(at 100% 0%, hsla(339,49%,30%,0.05) 0, transparent 50%);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--ai-primary);
    text-decoration: none !important;
    transition: var(--ai-transition);
}

a:hover {
    color: var(--ai-primary-dark);
    text-decoration: none !important;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* === Typography === */
.text-gradient {
    background: var(--ai-gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.ai-center-intro-content img,
.ai-center-intro-content picture,
.ai-center-intro-content figure,
.ai-center-intro-content video,
.ai-center-intro-content iframe {
    display: none !important;
}

/* === Buttons === */
.ai-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--ai-radius-pill);
    cursor: pointer;
    transition: var(--ai-transition);
    border: none;
    text-decoration: none;
}

.ai-btn-primary {
    background: var(--ai-gradient-main);
    color: white;
    box-shadow: var(--ai-shadow-md);
}

.ai-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--ai-shadow-glow);
    color: white;
}

.ai-btn-glass {
    background: var(--ai-bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--ai-border-light);
    color: var(--ai-text-primary);
    box-shadow: var(--ai-shadow-glass);
}

.ai-btn-glass:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
}

/* === Header (Glassmorphism) === */
.ai-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    transition: var(--ai-transition);
}

.ai-nav-wrap {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 28px;
}

.ai-header.scrolled {
    box-shadow: var(--ai-shadow-sm);
    background: rgba(255, 255, 255, 0.95);
}

.ai-nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
    gap: 32px;
}

.ai-logo {
    flex: 0 0 auto;
    min-width: 140px;
}

.ai-navbar {
    flex: 1 1 auto;
    min-width: 0;
}

.ai-logo a {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--ai-text-primary);
    text-decoration: none;
}

.ai-logo img {
    height: 40px;
}

.ai-logo-light {
    display: none;
}

.ai-logo-dark {
    display: block;
}

.ai-nav-list {
    display: flex;
    gap: 30px;
    list-style: none;
    margin: 0;
    padding: 0;
    height: 100%;
    align-items: center;
}

.ai-nav-item > a {
    color: var(--ai-text-secondary);
    font-weight: 500;
    font-size: 15px;
    padding: 30px 10px; /* 增加左右 padding，让热区更大 */
    position: relative;
    display: flex;
    align-items: center;
    gap: 6px;
    text-decoration: none !important;
    height: 100%; /* 确保链接撑满父级 */
}

.ai-nav-item > a::after {
    content: '';
    position: absolute;
    bottom: 22px; /* 调整动画线的位置 */
    left: 0;
    width: 0;
    height: 2px;
    background: var(--ai-gradient-main);
    transition: var(--ai-transition);
    border-radius: 2px;
}

.ai-nav-item:hover > a::after,
.ai-nav-item.active > a::after {
    width: 100%;
}

.ai-nav-item:hover > a,
.ai-nav-item.active > a {
    color: var(--ai-primary);
}

/* Sub Navigation */
.ai-sub-nav {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background: #fff;
    border-radius: var(--ai-radius-sm);
    box-shadow: var(--ai-shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--ai-transition);
    list-style: none;
    padding: 8px 0;
    margin: 0;
    z-index: 1001;
    pointer-events: none;
    display: block; /* 必须要有基础显示 */
}

.ai-nav-item {
    height: 100%;
    display: flex;
    align-items: center;
    position: relative; /* 确保子菜单定位基准正确 */
}

.ai-sub-nav:empty {
    display: none !important;
}

/* 强制使用最基础的后代选择器，不依赖任何伪类，以确保最高兼容性 */
.ai-nav-item:hover .ai-sub-nav,
.ai-nav-item:focus-within .ai-sub-nav {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
    pointer-events: auto !important;
}

.ai-sub-nav li a {
    display: block;
    padding: 12px 20px;
    color: var(--ai-text-secondary);
    font-size: 14px;
    white-space: nowrap;
    transition: var(--ai-transition);
    text-decoration: none !important;
}

.ai-sub-nav li a:hover {
    color: var(--ai-primary);
    background: var(--ai-bg-base);
}

/* Nav Actions */
.ai-nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex: 0 0 auto;
}

.ai-search-btn {
    background: none;
    border: none;
    color: var(--ai-text-secondary);
    font-size: 18px;
    cursor: pointer;
    transition: var(--ai-transition);
}

.ai-search-btn:hover {
    color: var(--ai-primary);
}

.ai-mobile-toggle {
    display: none;
}

/* Search Overlay */
.ai-search-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--ai-transition);
}

.ai-search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.ai-search-box {
    width: 90%;
    max-width: 600px;
    position: relative;
}

.ai-search-box form {
    display: flex;
    align-items: center;
    border-bottom: 2px solid var(--ai-primary);
    padding-bottom: 10px;
}

.ai-search-box input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 24px;
    outline: none;
    color: var(--ai-text-primary);
}

.ai-search-box button[type="submit"] {
    background: none;
    border: none;
    color: var(--ai-primary);
    font-size: 24px;
    cursor: pointer;
}

.ai-search-close {
    position: absolute;
    top: -60px;
    right: 0;
    background: none;
    border: none;
    color: var(--ai-text-secondary);
    font-size: 32px;
    cursor: pointer;
}

/* === Hero Section === */
.ai-hero {
    position: relative;
    overflow: hidden;
}

.ai-hero-slider {
    position: relative;
    width: 100%;
}

.ai-hero-slider .bxslider {
    margin: 0;
    padding: 0;
    list-style: none;
}

.ai-hero-slider .bxslider li {
    width: 100vw !important;
}

.ai-hero-slide-item {
    min-height: 400px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
    width: 100vw !important; /* 确保每一个 slide 占满屏幕宽度 */
    height: 400px;
    display: flex;
    align-items: center;
}

.ai-hero-slide-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(8, 15, 32, 0.18);
}

.ai-hero-slide-item::before {
    content: '';
    position: absolute;
    top: -20%; right: -10%; width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(124,58,237,0.08) 0%, rgba(255,255,255,0) 70%);
    border-radius: 50%; z-index: 1;
}

.ai-hero-slide-item::after {
    content: '';
    position: absolute;
    bottom: -10%; left: -10%; width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, rgba(255,255,255,0) 70%);
    border-radius: 50%; z-index: 1;
}

.ai-hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

/* bxslider styles override */
.bx-wrapper {
    margin-bottom: 0 !important;
    border: none !important;
    box-shadow: none !important;
    background: transparent !important;
}

.bx-wrapper .bx-pager {
    bottom: 60px !important;
}

.bx-wrapper .bx-pager.bx-default-pager a {
    background: rgba(124,58,237,0.3) !important;
    width: 12px !important;
    height: 12px !important;
    border-radius: 50% !important;
    margin: 0 6px !important;
    transition: var(--ai-transition);
}

.bx-wrapper .bx-pager.bx-default-pager a:hover,
.bx-wrapper .bx-pager.bx-default-pager a.active {
    background: var(--ai-primary) !important;
    transform: scale(1.2);
}

.ai-hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(124, 58, 237, 0.1);
    color: var(--ai-primary);
    border-radius: var(--ai-radius-pill);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid rgba(124, 58, 237, 0.2);
}

.ai-hero-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.ai-hero-subtitle {
    font-size: 18px;
    color: var(--ai-text-secondary);
    margin-bottom: 40px;
    font-weight: 400;
}

.ai-hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* === Glassmorphism Cards (Bento Grid) === */
.ai-section {
    padding: 100px 0;
}

.ai-section-header {
    text-align: center;
    margin-bottom: 60px;
}

.ai-section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.ai-section-desc {
    font-size: 16px;
    color: var(--ai-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}


.ai-bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.ai-glass-card {
    background: var(--ai-bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--ai-border-light);
    border-radius: var(--ai-radius-lg);
    padding: 32px;
    box-shadow: var(--ai-shadow-glass);
    transition: var(--ai-transition);
    position: relative;
    overflow: hidden;
}

.ai-glass-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--ai-shadow-lg);
    border-color: rgba(124, 58, 237, 0.3);
}

.ai-card-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--ai-radius-md);
    background: var(--ai-gradient-glass);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--ai-primary);
    margin-bottom: 24px;
    box-shadow: var(--ai-shadow-sm);
}

.ai-card-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}

.ai-card-desc {
    color: var(--ai-text-secondary);
    font-size: 15px;
    line-height: 1.6;
}

.ai-card-img-wrap {
    margin: -32px -32px 24px -32px;
    height: 200px;
    overflow: hidden;
    position: relative;
}

.ai-card-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--ai-transition-slow);
}

.ai-glass-card:hover .ai-card-img-wrap img {
    transform: scale(1.05);
}

/* === bxSlider Overrides (Fix dots & wrappers) === */
.bx-wrapper {
    margin-bottom: 0 !important;
    border: none !important;
    box-shadow: none !important;
    background: transparent !important;
}

.bx-wrapper .bx-viewport {
    border: none !important;
    box-shadow: none !important;
    background: transparent !important;
    left: 0 !important;
}

.bx-wrapper {
    position: relative;
}

.bx-wrapper .bx-controls.bx-has-pager .bx-pager,
.bx-wrapper .bx-pager {
    position: absolute;
    bottom: 30px !important;
    z-index: 50;
    left: 50%;
    transform: translateX(-50%);
    width: auto !important;
    display: flex !important;
    align-items: center;
    justify-content: center;
    gap: 12px;
    text-align: center !important;
}

.bx-wrapper .bx-pager-item {
    display: block !important;
    flex: 0 0 auto;
    line-height: 0;
}

.bx-wrapper .bx-pager.bx-default-pager a {
    display: block;
    font-size: 0;
    line-height: 0;
    text-indent: -9999px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.4) !important;
    border-radius: 50% !important;
    width: 12px !important;
    height: 12px !important;
    transition: all 0.3s ease !important;
}

.bx-wrapper .bx-pager.bx-default-pager a:hover,
.bx-wrapper .bx-pager.bx-default-pager a.active {
    background: #fff !important;
    transform: scale(1.3) !important;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5) !important;
}

/* === Stats Section (Numbers fix) === */
.ai-stats-wrap {
    background: var(--ai-bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--ai-border-base);
    border-radius: var(--ai-radius-lg);
    padding: 40px;
    margin-top: -60px; /* 向上悬浮遮挡轮播图底部 */
    position: relative;
    z-index: 10;
    display: flex;
    justify-content: space-around; /* 均匀分布 */
    align-items: center; /* 垂直居中 */
    flex-wrap: wrap; /* 移动端换行 */
    box-shadow: var(--ai-shadow-lg);
}

.ai-stat-item {
    text-align: center;
    padding: 20px;
    flex: 1; /* 均匀占据空间 */
    min-width: 150px;
}

.ai-stat-num {
    font-size: 40px;
    font-weight: 800;
    color: var(--ai-primary);
    margin-bottom: 8px;
    background: var(--ai-gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.ai-stat-label {
    color: var(--ai-text-secondary);
    font-size: 15px;
    font-weight: 500;
}

/* === CTA Section === */
.ai-cta-section {
    background: var(--ai-gradient-main);
    border-radius: var(--ai-radius-lg);
    padding: 80px 40px;
    text-align: center;
    color: white;
    margin: 60px 0;
    position: relative;
    overflow: hidden;
}

.ai-cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg width="20" height="20" xmlns="http://www.w3.org/2000/svg"><circle cx="2" cy="2" r="1" fill="rgba(255,255,255,0.2)"/></svg>');
    opacity: 0.5;
}

.ai-cta-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
    position: relative;
}

.ai-cta-desc {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 40px;
    position: relative;
}

.ai-cta-btn {
    background: white;
    color: var(--ai-primary);
    padding: 16px 40px;
    font-size: 18px;
    border-radius: var(--ai-radius-pill);
    font-weight: 700;
    display: inline-block;
    transition: var(--ai-transition);
    position: relative;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.ai-cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
    color: var(--ai-primary-dark);
}

/* === Testimonials === */
.ai-testimonial-card {
    background: white;
    padding: 40px;
    border-radius: var(--ai-radius-lg);
    box-shadow: var(--ai-shadow-sm);
    border: 1px solid var(--ai-border-base);
    position: relative;
}

.ai-testimonial-icon {
    position: absolute;
    top: 40px;
    right: 40px;
    font-size: 40px;
    color: rgba(124, 58, 237, 0.1);
}

.ai-testimonial-text {
    font-size: 16px;
    color: var(--ai-text-secondary);
    font-style: italic;
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}

.ai-testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
}

.ai-testimonial-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.ai-testimonial-name {
    font-weight: 700;
    color: var(--ai-text-primary);
}

.ai-testimonial-role {
    font-size: 13px;
    color: var(--ai-text-muted);
}

/* === Quiz Page === */
.ai-btn-outline {
    background: #fff;
    color: var(--ai-text-primary);
    border: 1px solid var(--ai-border-base);
    box-shadow: var(--ai-shadow-sm);
}

.ai-btn-outline:hover {
    color: #1d4ed8;
    border-color: rgba(37, 99, 235, 0.22);
    background: rgba(37, 99, 235, 0.05);
}

.ai-btn-success {
    background: linear-gradient(135deg, #1d4ed8, #2563eb);
    color: #fff;
    box-shadow: 0 12px 28px rgba(37, 99, 235, 0.22);
}

.ai-btn-success:hover {
    color: #fff;
    transform: translateY(-2px);
}

.ai-btn:disabled,
.ai-btn[disabled] {
    opacity: 0.55;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.ai-quiz-wrap {
    max-width: 980px;
    margin: 0 auto;
    position: relative;
}

.ai-quiz-wrap .ai-btn-primary {
    background: linear-gradient(135deg, #1d4ed8, #2563eb);
    box-shadow: 0 10px 24px rgba(37, 99, 235, 0.18);
}

.ai-quiz-wrap .ai-btn-primary:hover {
    box-shadow: 0 14px 28px rgba(37, 99, 235, 0.22);
}

.ai-login-card,
.ai-quiz-card,
.ai-quiz-header,
.ai-quiz-body,
.ai-quiz-result-card,
#stepReview,
.ai-quiz-records {
    background: #ffffff;
    border: 1px solid #dbe4f0;
    border-radius: var(--ai-radius-lg);
    box-shadow: 0 20px 48px rgba(15, 23, 42, 0.06);
    position: relative;
    overflow: hidden;
}

.ai-login-card::before,
.ai-quiz-card::before,
.ai-quiz-header::before,
.ai-quiz-result-card::before,
#stepReview::before,
.ai-quiz-records::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, #0f172a, #1d4ed8 68%, #60a5fa);
}

.ai-login-card {
    max-width: 620px;
    margin: 0 auto;
    overflow: hidden;
}

.ai-login-header {
    padding: 38px 40px 24px;
    text-align: center;
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.025), rgba(15, 23, 42, 0));
}

.ai-login-icon-wrap {
    width: 84px;
    height: 84px;
    margin: 0 auto 20px;
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    color: #fff;
    background: linear-gradient(135deg, #0f172a, #1d4ed8);
    box-shadow: 0 16px 30px rgba(29, 78, 216, 0.18);
}

.ai-login-header h3 {
    margin-bottom: 10px;
    font-size: 30px;
    font-weight: 700;
    color: var(--ai-text-primary);
}

.ai-login-header p {
    margin: 0;
    font-size: 15px;
    line-height: 1.8;
    color: var(--ai-text-secondary);
}

.ai-login-body {
    padding: 0 40px 32px;
}

.ai-login-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.ai-login-field {
    display: flex;
    align-items: stretch;
    gap: 16px;
    padding: 18px 20px;
    border-radius: 18px;
    border: 1px solid var(--ai-border-base);
    background: #fff;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
    transition: var(--ai-transition);
}

.ai-login-field:hover,
.ai-login-field:focus-within {
    border-color: rgba(37, 99, 235, 0.22);
    box-shadow: 0 12px 26px rgba(29, 78, 216, 0.08);
}

.ai-login-field-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #1d4ed8;
    background: rgba(37, 99, 235, 0.08);
    flex: 0 0 auto;
}

.ai-login-field-input {
    flex: 1;
    min-width: 0;
}

.ai-login-field-input label {
    display: block;
    margin-bottom: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--ai-text-secondary);
}

.ai-login-field-input input {
    width: 100%;
    padding: 0;
    border: none;
    outline: none;
    font-size: 16px;
    color: var(--ai-text-primary);
    background: transparent;
}

.ai-login-field-input input::placeholder {
    color: #94a3b8;
}

.ai-login-btn,
.ai-quiz-start-btn {
    width: 100%;
    min-height: 52px;
    font-size: 16px;
}

.ai-login-footer {
    padding: 18px 24px;
    border-top: 1px solid var(--ai-border-base);
    text-align: center;
    font-size: 14px;
    color: var(--ai-text-secondary);
    background: linear-gradient(180deg, rgba(248, 250, 252, 0.92), rgba(241, 245, 249, 0.85));
}

.ai-login-error {
    display: none;
    margin: 0 40px 32px;
    padding: 14px 16px;
    border-radius: 14px;
    color: #dc2626;
    background: rgba(220, 38, 38, 0.08);
    border: 1px solid rgba(220, 38, 38, 0.16);
}

.ai-login-error.show {
    display: block;
}

.ai-quiz-user-summary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.ai-quiz-user-card {
    min-width: 320px;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 24px;
    color: #fff;
    background: linear-gradient(135deg, #0f172a, #1e3a8a 72%, #2563eb);
    border-radius: 18px;
    box-shadow: 0 18px 34px rgba(15, 23, 42, 0.16);
}

.ai-quiz-user-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    background: rgba(255, 255, 255, 0.2);
    flex: 0 0 auto;
}

.ai-quiz-user-name {
    font-size: 20px;
    font-weight: 700;
}

.ai-quiz-user-id {
    margin-top: 4px;
    font-size: 13px;
    opacity: 0.82;
}

.ai-quiz-user-meta {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
    padding: 16px 20px;
    border-radius: 16px;
    background: linear-gradient(180deg, #ffffff, #f8fbff);
    border: 1px solid #dbe4f0;
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.04);
}

.ai-quiz-user-meta-item {
    font-size: 14px;
    color: var(--ai-text-primary);
}

.ai-quiz-user-meta-item em {
    font-style: normal;
    color: var(--ai-text-secondary);
}

.ai-quiz-user-meta-item strong {
    margin-left: 6px;
}

.ai-quiz-info-shell {
    max-width: 760px;
    margin: 0 auto;
}

.ai-loading-spinner {
    padding: 50px 24px;
    text-align: center;
    font-size: 15px;
    color: var(--ai-text-secondary);
}

.ai-loading-spinner i {
    margin-right: 8px;
}

.ai-quiz-intro-card {
    padding: 32px;
    background: linear-gradient(180deg, rgba(248, 250, 252, 0.88), #ffffff 120px);
}

.ai-quiz-intro-head {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 22px;
}

.ai-quiz-card-icon {
    width: 56px;
    height: 56px;
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #1d4ed8;
    background: linear-gradient(180deg, rgba(37, 99, 235, 0.12), rgba(37, 99, 235, 0.06));
    flex: 0 0 auto;
}

.ai-quiz-card-icon-lg {
    width: 70px;
    height: 70px;
    font-size: 30px;
}

.ai-quiz-intro-copy h4 {
    margin: 0 0 6px;
    font-size: 24px;
    font-weight: 700;
    color: var(--ai-text-primary);
}

.ai-quiz-intro-copy p {
    margin: 0;
    color: var(--ai-text-secondary);
    line-height: 1.8;
}

.ai-quiz-type-list {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.ai-quiz-type-pill {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    border-radius: 999px;
    color: #334155;
    font-size: 14px;
    border: 1px solid var(--ai-border-base);
    background: #f8fafc;
}

.ai-quiz-type-pill strong {
    font-weight: 700;
}

.ai-quiz-type-yellow { border-left: 4px solid #d97706; }
.ai-quiz-type-green { border-left: 4px solid #059669; }
.ai-quiz-type-blue { border-left: 4px solid #0284c7; }

.ai-quiz-notice {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 24px;
    padding: 14px 16px;
    border-radius: 16px;
    border: 1px solid rgba(37, 99, 235, 0.14);
    background: linear-gradient(180deg, rgba(239, 246, 255, 0.95), rgba(248, 250, 252, 0.96));
    color: #1e40af;
    font-size: 14px;
    line-height: 1.8;
}

.ai-quiz-notice i {
    margin-top: 4px;
    flex: 0 0 auto;
}

.ai-empty {
    padding: 48px 24px;
    text-align: center;
    color: var(--ai-text-secondary);
}

.ai-empty i {
    display: block;
    margin-bottom: 12px;
    font-size: 30px;
    color: #cbd5e1;
}

.ai-quiz-empty-state {
    border: 1px dashed #cbd5e1;
    border-radius: 20px;
    background: linear-gradient(180deg, #f8fafc, #ffffff);
}

.ai-quiz-empty-inline {
    margin-top: 10px;
    padding: 28px 20px;
}

.ai-quiz-header {
    padding: 28px 32px;
    margin-bottom: 18px;
    background: linear-gradient(180deg, rgba(248, 250, 252, 0.96), #ffffff);
}

.ai-quiz-header h3 {
    margin-bottom: 10px;
    font-size: 28px;
    font-weight: 700;
    color: var(--ai-text-primary);
}

.ai-quiz-header-meta {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
    margin-bottom: 14px;
    font-size: 14px;
    color: var(--ai-text-secondary);
}

.ai-quiz-header-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.ai-quiz-progress {
    display: flex;
    align-items: center;
    gap: 14px;
}

.ai-quiz-progress-bar {
    flex: 1;
    height: 12px;
    border-radius: 999px;
    overflow: hidden;
    background: #e7edf5;
}

.ai-quiz-progress-fill {
    width: 0;
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(90deg, #0f172a, #1d4ed8 70%, #60a5fa);
    transition: width 0.3s ease;
}

.ai-quiz-progress-text {
    flex: 0 0 auto;
    font-size: 14px;
    font-weight: 700;
    color: var(--ai-text-primary);
}

.ai-quiz-timer {
    margin-top: 18px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.05);
    color: #0f172a;
    font-weight: 700;
    border: 1px solid rgba(148, 163, 184, 0.22);
}

.ai-quiz-timer.warning {
    color: #dc2626;
    background: rgba(220, 38, 38, 0.08);
}

.ai-quiz-body {
    padding: 30px 32px;
    background: linear-gradient(180deg, #ffffff, #fbfdff);
}

.ai-quiz-wrap,
.ai-quiz-wrap input,
.ai-quiz-wrap button,
.ai-quiz-wrap select,
.ai-quiz-wrap textarea {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
}

.ai-quiz-question h4 {
    margin-bottom: 12px;
    font-size: 21px;
    line-height: 1.75;
    letter-spacing: normal;
    word-spacing: normal;
    color: var(--ai-text-primary);
}

.ai-q-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    margin-right: 10px;
    border-radius: 50%;
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    background: linear-gradient(135deg, #0f172a, #1d4ed8);
    vertical-align: middle;
    box-shadow: 0 10px 22px rgba(29, 78, 216, 0.16);
}

.ai-quiz-question-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    margin-left: 10px;
    border-radius: 999px;
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    vertical-align: middle;
}

.ai-quiz-badge-yellow { background: #b45309; }
.ai-quiz-badge-green { background: #047857; }
.ai-quiz-badge-blue { background: #0369a1; }

.ai-quiz-question-tip {
    margin-bottom: 14px;
    font-size: 13px;
    color: var(--ai-text-muted);
}

.ai-quiz-options {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.ai-quiz-option {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 18px 20px;
    border-radius: 18px;
    border: 1px solid #dbe4f0;
    background: linear-gradient(180deg, #ffffff, #fbfdff);
    cursor: pointer;
    transition: var(--ai-transition);
}

.ai-quiz-option:hover {
    transform: translateY(-1px);
    border-color: rgba(37, 99, 235, 0.24);
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.06);
}

.ai-quiz-option.selected {
    border-color: rgba(29, 78, 216, 0.42);
    background: linear-gradient(180deg, rgba(219, 234, 254, 0.62), rgba(239, 246, 255, 0.95));
    box-shadow: 0 12px 28px rgba(37, 99, 235, 0.08);
}

.ai-quiz-option.correct-answer {
    border-color: rgba(22, 163, 74, 0.3);
    background: rgba(22, 163, 74, 0.07);
}

.ai-quiz-option.wrong-answer {
    border-color: rgba(220, 38, 38, 0.28);
    background: rgba(220, 38, 38, 0.06);
}

.ai-option-label {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    color: #1d4ed8;
    background: linear-gradient(180deg, rgba(37, 99, 235, 0.12), rgba(37, 99, 235, 0.06));
    font-weight: 700;
}

.ai-option-text {
    flex: 1;
    line-height: 1.8;
    letter-spacing: normal;
    word-spacing: normal;
    word-break: break-word;
    color: var(--ai-text-primary);
}

.ai-quiz-question-tip,
.ai-quiz-notice,
.ai-review-meta {
    letter-spacing: normal;
    word-spacing: normal;
}

.ai-quiz-footer {
    margin-top: 18px;
    display: flex;
    gap: 14px;
    justify-content: flex-end;
    align-items: center;
}

.ai-quiz-result-card,
#stepReview,
.ai-quiz-records {
    padding: 34px 32px;
}

.ai-quiz-result-card {
    text-align: center;
    background: linear-gradient(180deg, rgba(248, 250, 252, 0.92), #ffffff 140px);
}

.ai-quiz-result-flags {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}

.ai-quiz-result-flag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 86px;
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.28);
    background: rgba(248, 250, 252, 0.92);
    color: #475569;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.ai-quiz-result-flag.is-pass {
    color: #166534;
    background: rgba(220, 252, 231, 0.9);
    border-color: rgba(34, 197, 94, 0.22);
}

.ai-quiz-result-flag.is-mid {
    color: #1d4ed8;
    background: rgba(219, 234, 254, 0.92);
    border-color: rgba(37, 99, 235, 0.2);
}

.ai-quiz-result-flag.is-fail {
    color: #b45309;
    background: rgba(254, 243, 199, 0.92);
    border-color: rgba(245, 158, 11, 0.2);
}

.ai-quiz-result-icon {
    width: 92px;
    height: 92px;
    margin: 0 auto 18px;
    border-radius: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    background: linear-gradient(180deg, rgba(219, 234, 254, 0.88), rgba(239, 246, 255, 0.8));
    color: #1d4ed8;
    border: 1px solid rgba(37, 99, 235, 0.12);
}

.ai-quiz-result-icon.is-pass {
    color: #166534;
    background: rgba(22, 163, 74, 0.1);
}

.ai-quiz-result-icon.is-mid {
    color: #1d4ed8;
    background: rgba(37, 99, 235, 0.08);
}

.ai-quiz-result-icon.is-fail {
    color: #b45309;
    background: rgba(245, 158, 11, 0.12);
}

.ai-quiz-result-card h2 {
    margin-bottom: 22px;
    font-size: 34px;
    font-weight: 700;
}

.ai-quiz-score {
    margin-bottom: 24px;
}

.ai-quiz-score-circle {
    width: 150px;
    height: 150px;
    margin: 0 auto;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top, rgba(37, 99, 235, 0.12), rgba(255, 255, 255, 0.96));
    border: 1px solid rgba(37, 99, 235, 0.14);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.ai-quiz-score-number {
    font-size: 48px;
    font-weight: 800;
    color: #1d4ed8;
    line-height: 1;
}

.ai-quiz-score-unit {
    margin-top: 8px;
    color: var(--ai-text-secondary);
}

.ai-quiz-result-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 28px;
}

.ai-quiz-stat {
    padding: 18px 16px;
    border-radius: 18px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    border: 1px solid #dbe4f0;
}

.ai-quiz-stat-num {
    display: block;
    margin-bottom: 8px;
    font-size: 24px;
    font-weight: 800;
    color: var(--ai-text-primary);
}

.ai-quiz-stat-label {
    font-size: 13px;
    color: var(--ai-text-secondary);
}

.ai-quiz-result-actions,
.ai-quiz-review-actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

.ai-quiz-section-title {
    margin-bottom: 22px;
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--ai-text-primary);
}

.ai-review-item {
    padding: 24px;
    border-radius: 20px;
    border: 1px solid #dbe4f0;
    background: linear-gradient(180deg, #ffffff, #fbfdff);
    box-shadow: 0 12px 22px rgba(15, 23, 42, 0.04);
}

.ai-review-item + .ai-review-item {
    margin-top: 18px;
}

.ai-review-item.correct {
    border-color: rgba(22, 163, 74, 0.18);
}

.ai-review-item.wrong {
    border-color: rgba(220, 38, 38, 0.16);
}

.ai-review-item h4 {
    margin-bottom: 16px;
    font-size: 20px;
    line-height: 1.6;
}

.ai-review-meta {
    margin-top: 16px;
    font-size: 14px;
    color: var(--ai-text-secondary);
}

.ai-quiz-records {
    margin-top: 36px;
}

.ai-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    overflow: hidden;
}

.ai-table th,
.ai-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--ai-border-base);
}

.ai-table th {
    font-size: 14px;
    font-weight: 700;
    color: var(--ai-text-primary);
    background: linear-gradient(180deg, #f8fafc, #f1f5f9);
}

.ai-table td {
    font-size: 14px;
    color: var(--ai-text-secondary);
    background: #fff;
}

.ai-table tbody tr:hover td {
    background: rgba(241, 245, 249, 0.9);
}

.ai-quiz-record-score {
    font-size: 18px;
    color: var(--ai-text-primary);
}

.ai-quiz-status {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 62px;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
}

.ai-quiz-status.is-pass {
    color: #15803d;
    background: rgba(34, 197, 94, 0.12);
}

.ai-quiz-status.is-fail {
    color: #dc2626;
    background: rgba(220, 38, 38, 0.1);
}

/* === Certificate Query === */
.ai-certificate-wrap {
    max-width: 980px;
    margin: 0 auto;
}

.ai-cert-card-wrap,
.ai-cert-result-card,
.ai-cert-tips-new {
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--ai-border-base);
    border-radius: var(--ai-radius-lg);
    box-shadow: var(--ai-shadow-md);
}

.ai-cert-card-wrap {
    overflow: hidden;
}

.ai-cert-card-header-bar {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 30px 34px 24px;
    background:
        linear-gradient(180deg, rgba(15, 23, 42, 0.04), rgba(15, 23, 42, 0)),
        #fff;
    border-bottom: 1px solid var(--ai-border-base);
}

.ai-cert-card-icon-circle {
    width: 72px;
    height: 72px;
    border-radius: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    color: #fff;
    font-size: 30px;
    background: linear-gradient(135deg, #1e3a8a, #2563eb);
    box-shadow: 0 18px 40px rgba(37, 99, 235, 0.18);
}

.ai-cert-card-header-bar h3 {
    margin-bottom: 8px;
    font-size: 28px;
    font-weight: 700;
    color: var(--ai-text-primary);
}

.ai-cert-card-header-bar p {
    margin: 0;
    font-size: 15px;
    line-height: 1.8;
    color: var(--ai-text-secondary);
}

.ai-cert-card-body {
    padding: 0 34px 30px;
}

.ai-cert-form-new {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.ai-cert-field {
    display: flex;
    align-items: stretch;
    gap: 16px;
    padding: 18px 20px;
    border-radius: 18px;
    border: 1px solid var(--ai-border-base);
    background: #fff;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
    transition: var(--ai-transition);
}

.ai-cert-field:hover,
.ai-cert-field:focus-within {
    border-color: rgba(37, 99, 235, 0.2);
    box-shadow: 0 14px 34px rgba(37, 99, 235, 0.08);
}

.ai-cert-field-sm {
    background: rgba(248, 250, 252, 0.9);
}

.ai-cert-field-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    font-size: 20px;
    color: #1d4ed8;
    background: rgba(37, 99, 235, 0.08);
}

.ai-cert-field-input {
    flex: 1;
    min-width: 0;
}

.ai-cert-field-input label {
    display: block;
    margin-bottom: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--ai-text-secondary);
}

.ai-cert-field-input input {
    width: 100%;
    padding: 0;
    border: none;
    outline: none;
    background: transparent;
    color: var(--ai-text-primary);
    font-size: 16px;
}

.ai-cert-field-input input::placeholder {
    color: #94a3b8;
}

.ai-cert-optional {
    font-weight: 400;
    color: var(--ai-text-muted);
}

.ai-cert-divider {
    position: relative;
    text-align: center;
    margin: 2px 0;
}

.ai-cert-divider::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--ai-border-base);
}

.ai-cert-divider span {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: #fff;
    border: 1px solid var(--ai-border-base);
    color: var(--ai-text-secondary);
    font-size: 13px;
    font-weight: 700;
}

.ai-cert-submit-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    min-height: 54px;
    border: none;
    border-radius: var(--ai-radius-pill);
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, #1d4ed8, #2563eb);
    box-shadow: 0 14px 30px rgba(37, 99, 235, 0.22);
    transition: var(--ai-transition);
}

.ai-cert-submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 38px rgba(37, 99, 235, 0.28);
}

.ai-cert-card-tips {
    padding: 18px 24px;
    border-top: 1px solid var(--ai-border-base);
    text-align: center;
    font-size: 14px;
    color: var(--ai-text-secondary);
    background: rgba(248, 250, 252, 0.72);
}

.ai-cert-card-tips i {
    margin-right: 6px;
    color: #1d4ed8;
}

.ai-cert-result-area {
    margin-top: 30px;
}

.ai-cert-result-header {
    padding: 30px 32px 22px;
    text-align: center;
    border-bottom: 1px solid var(--ai-border-base);
    position: relative;
    overflow: hidden;
}

.ai-cert-result-flags {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.ai-cert-result-flag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 86px;
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.28);
    background: rgba(248, 250, 252, 0.92);
    color: #475569;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.ai-cert-result-flag.is-success {
    color: #166534;
    background: rgba(220, 252, 231, 0.9);
    border-color: rgba(34, 197, 94, 0.22);
}

.ai-cert-result-flag.is-error {
    color: #b91c1c;
    background: rgba(254, 226, 226, 0.92);
    border-color: rgba(239, 68, 68, 0.18);
}

.ai-cert-result-header i {
    display: block;
    margin-bottom: 14px;
    font-size: 48px;
}

.ai-cert-result-header h3 {
    margin-bottom: 8px;
    font-size: 28px;
    font-weight: 700;
}

.ai-cert-result-header p {
    margin: 0;
    font-size: 15px;
    color: var(--ai-text-secondary);
}

.ai-cert-result-header.success i,
.ai-cert-result-header.success h3 {
    color: #166534;
}

.ai-cert-result-header.error i,
.ai-cert-result-header.error h3 {
    color: #dc2626;
}

.ai-cert-result-body {
    padding: 28px 32px 32px;
}

.ai-cert-result-note {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 18px;
    padding: 14px 16px;
    border-radius: 14px;
    border: 1px solid rgba(37, 99, 235, 0.12);
    background: linear-gradient(180deg, rgba(37, 99, 235, 0.04), rgba(37, 99, 235, 0.02));
    color: #475569;
    line-height: 1.8;
}

.ai-cert-result-note i {
    margin-top: 5px;
    color: #1d4ed8;
    flex: 0 0 auto;
}

.ai-cert-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.ai-cert-info-item {
    padding: 18px 20px;
    border-radius: 18px;
    border: 1px solid var(--ai-border-base);
    background: rgba(248, 250, 252, 0.85);
}

.ai-cert-info-label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    font-size: 13px;
    font-weight: 600;
    color: var(--ai-text-secondary);
}

.ai-cert-info-label i {
    color: #1d4ed8;
}

.ai-cert-info-value {
    display: block;
    font-size: 18px;
    font-weight: 700;
    line-height: 1.6;
    color: var(--ai-text-primary);
    word-break: break-all;
}

.ai-cert-badge-active {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 64px;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    color: #166534;
    background: rgba(220, 252, 231, 0.9);
    border: 1px solid rgba(34, 197, 94, 0.18);
}

.ai-cert-tips-new {
    margin-top: 30px;
    padding: 28px 30px;
}

.ai-cert-tips-title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
    font-size: 22px;
    font-weight: 700;
    color: var(--ai-text-primary);
}

.ai-cert-tips-title i {
    color: #1d4ed8;
}

.ai-cert-tips-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.ai-cert-tip-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 16px;
    border-radius: 14px;
    background: rgba(248, 250, 252, 0.84);
    border: 1px solid var(--ai-border-base);
    color: var(--ai-text-secondary);
    line-height: 1.8;
}

.ai-cert-tip-item i {
    margin-top: 5px;
    color: #16a34a;
    flex: 0 0 auto;
}

.ai-cert-tip-item a {
    font-weight: 600;
}

/* === Footer === */
.ai-footer {
    background: white;
    border-top: 1px solid var(--ai-border-base);
}

.ai-footer-cta {
    background: var(--ai-gradient-main);
    padding: 60px 0;
    text-align: center;
    color: white;
}

.ai-footer-cta-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 24px;
}

.ai-footer-main {
    padding: 60px 0 40px;
}

.ai-footer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.ai-footer-col h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--ai-text-primary);
}

.ai-footer-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ai-footer-col ul li {
    margin-bottom: 12px;
}

.ai-footer-col ul a {
    color: var(--ai-text-secondary);
}

.ai-footer-col ul a:hover {
    color: var(--ai-primary);
}

.ai-footer-contact li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--ai-text-secondary);
}

.ai-footer-contact li i {
    color: var(--ai-primary);
}

.ai-footer-social {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.ai-social-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--ai-bg-base);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ai-text-primary);
    transition: var(--ai-transition);
    position: relative;
}

.ai-social-icon:hover {
    background: var(--ai-primary);
    color: white;
    transform: translateY(-3px);
}

.ai-wechat-qr {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: white;
    padding: 10px;
    border-radius: var(--ai-radius-sm);
    box-shadow: var(--ai-shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--ai-transition);
}

.ai-social-icon:hover .ai-wechat-qr {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-10px);
}

.ai-footer-qrcode img {
    width: 120px;
    border-radius: var(--ai-radius-sm);
}

.ai-footer-qrcode p {
    font-size: 13px;
    color: var(--ai-text-muted);
    margin-top: 8px;
}

.ai-footer-bottom {
    text-align: center;
    padding: 24px 0;
    border-top: 1px solid var(--ai-border-base);
    color: var(--ai-text-muted);
    font-size: 14px;
}

.ai-footer-bottom a {
    color: var(--ai-text-secondary);
}

.ai-footer-bottom a:hover {
    color: var(--ai-primary);
}

/* === Inner Pages & Articles === */
.ai-page-banner {
    padding: 160px 0 80px;
    background: var(--ai-gradient-main);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.ai-page-banner-sm {
    padding: 140px 0 60px;
}

.ai-page-banner::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: url('data:image/svg+xml;utf8,<svg width="40" height="40" xmlns="http://www.w3.org/2000/svg"><circle cx="20" cy="20" r="1" fill="rgba(255,255,255,0.15)"/></svg>');
}

.ai-page-banner-title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
}

.ai-page-banner-meta {
    display: flex;
    justify-content: center;
    gap: 20px;
    font-size: 15px;
    opacity: 0.9;
    position: relative;
    flex-wrap: wrap;
}

.ai-page-banner-meta a {
    color: white;
}

.ai-page-banner-meta a:hover {
    text-decoration: underline !important;
}

.ai-page-banner-meta i {
    margin-right: 6px;
}

.ai-article-wrap {
    background: white;
    border-radius: var(--ai-radius-lg);
    padding: 60px;
    box-shadow: var(--ai-shadow-sm);
    border: 1px solid var(--ai-border-base);
    margin-top: -40px;
    position: relative;
    z-index: 10;
}

.ai-breadcrumb {
    font-size: 14px;
    color: var(--ai-text-secondary);
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--ai-border-base);
}

.ai-breadcrumb a {
    color: var(--ai-text-secondary);
}

.ai-breadcrumb a:hover {
    color: var(--ai-primary);
}

.ai-article-content {
    font-size: 16px;
    line-height: 1.8;
    color: var(--ai-text-primary);
}

.ai-article-content img {
    display: none !important;
}

.ai-article-content figure,
.ai-article-content .image,
.ai-article-content .img,
.ai-article-content p:has(img),
.ai-article-content div:has(img) {
    display: none !important;
}

.ai-article-content h2, .ai-article-content h3, .ai-article-content h4 {
    margin: 40px 0 20px;
    font-weight: 700;
    color: var(--ai-text-primary);
}

.ai-article-content p {
    margin-bottom: 24px;
}

.ai-article-content ul, .ai-article-content ol {
    margin-bottom: 24px;
    padding-left: 24px;
}

.ai-article-content blockquote {
    border-left: 4px solid var(--ai-primary);
    padding: 20px;
    background: var(--ai-bg-base);
    margin: 32px 0;
    font-style: italic;
    color: var(--ai-text-secondary);
    border-radius: 0 var(--ai-radius-sm) var(--ai-radius-sm) 0;
}

.ai-article-nav {
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid var(--ai-border-base);
    display: flex;
    justify-content: space-between;
    font-size: 15px;
    flex-wrap: wrap;
    gap: 20px;
}

.ai-article-prev, .ai-article-next {
    max-width: 48%;
}

.ai-article-prev a, .ai-article-next a {
    color: var(--ai-primary);
    font-weight: 500;
}

.ai-article-prev a:hover, .ai-article-next a:hover {
    color: var(--ai-primary-dark);
    text-decoration: underline !important;
}

/* === Lists & Components === */
.ai-page-banner-bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-size: cover;
    background-position: center;
    z-index: -2;
    opacity: 0.3;
}

.ai-page-banner-desc {
    font-size: 18px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.ai-news-toolbar {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 28px;
    margin-bottom: 36px;
    padding: 28px 32px;
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid var(--ai-border-base);
    border-radius: var(--ai-radius-lg);
    box-shadow: var(--ai-shadow-sm);
}

.ai-news-toolbar-copy {
    flex: 1;
    min-width: 0;
}

.ai-news-toolbar-title {
    margin-bottom: 10px;
    font-size: 28px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--ai-text-primary);
}

.ai-news-toolbar-desc {
    margin: 0;
    max-width: 620px;
    font-size: 15px;
    line-height: 1.85;
    color: var(--ai-text-secondary);
}

.ai-cat-nav {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
    flex-wrap: wrap;
    justify-content: center;
}

.ai-cat-nav li {
    list-style: none;
}

.ai-cat-nav a {
    display: inline-block;
    padding: 8px 24px;
    background: var(--ai-bg-base);
    border-radius: var(--ai-radius-pill);
    color: var(--ai-text-secondary);
    font-weight: 500;
    transition: var(--ai-transition);
}

.ai-cat-nav li.active a, .ai-cat-nav a:hover {
    background: var(--ai-primary);
    color: white;
}

.ai-news-cats {
    justify-content: flex-end;
    margin: 0;
    flex: 0 0 auto;
    max-width: 48%;
}

.ai-news-list {
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.ai-card-horizontal {
    display: flex;
    background: white;
    border-radius: var(--ai-radius-lg);
    border: 1px solid var(--ai-border-base);
    box-shadow: var(--ai-shadow-sm);
    overflow: hidden;
    transition: var(--ai-transition);
}

.ai-card-horizontal:hover {
    transform: translateY(-5px);
    box-shadow: var(--ai-shadow-lg);
}

.ai-news-card {
    position: relative;
}

.ai-card-horizontal .ai-card-img {
    width: 200px;
    flex-shrink: 0;
    overflow: hidden;
}

.ai-card-horizontal .ai-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--ai-transition-slow);
}

.ai-card-horizontal:hover .ai-card-img img {
    transform: scale(1.05);
}

.ai-card-horizontal .ai-card-body {
    padding: 30px;
    flex: 1;
}

.ai-news-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 14px;
}

.ai-news-card .ai-card-title {
    margin-bottom: 14px;
    font-size: 24px;
    line-height: 1.45;
}

.ai-news-card .ai-card-title a {
    color: var(--ai-text-primary);
}

.ai-news-card .ai-card-title a:hover {
    color: var(--ai-primary);
}

.ai-news-card .ai-card-desc {
    margin-bottom: 0;
    font-size: 15px;
    line-height: 1.9;
    color: var(--ai-text-secondary);
}

.ai-card-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--ai-text-muted);
    flex-wrap: wrap;
}

.ai-card-meta i {
    margin-right: 4px;
}

.ai-news-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: var(--ai-radius-pill);
    border: 1px solid rgba(124, 58, 237, 0.14);
    background: rgba(124, 58, 237, 0.06);
    color: var(--ai-primary);
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
    transition: var(--ai-transition);
}

.ai-news-link:hover {
    background: var(--ai-primary);
    border-color: var(--ai-primary);
    color: #fff;
}

.ai-pagination {
    margin-top: 52px;
    display: flex;
    justify-content: center;
}

.ai-pagination .pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.ai-pagination .pagination li {
    list-style: none;
}

.ai-pagination .pagination li a,
.ai-pagination .pagination li span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 44px;
    padding: 0 14px;
    border-radius: 12px;
    background: #fff;
    color: var(--ai-text-secondary);
    border: 1px solid var(--ai-border-base);
    transition: var(--ai-transition);
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.05);
}

.ai-pagination .pagination li.active span,
.ai-pagination .pagination li a:hover {
    background: var(--ai-primary);
    color: #fff;
    border-color: var(--ai-primary);
    box-shadow: 0 12px 28px rgba(124, 58, 237, 0.18);
}

.ai-pagination .pagination li.disabled span {
    color: var(--ai-text-muted);
    background: rgba(255, 255, 255, 0.66);
    border-color: var(--ai-border-base);
    cursor: not-allowed;
    box-shadow: none;
    opacity: 0.7;
}

.ai-pagination .pagination li:first-child a,
.ai-pagination .pagination li:first-child span,
.ai-pagination .pagination li:last-child a,
.ai-pagination .pagination li:last-child span {
    min-width: 52px;
    font-size: 18px;
}

/* Utilities & Animations */
.anim-fade-up {
    animation: fadeUp 0.8s ease forwards;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 992px) {
    .ai-bento-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .ai-footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .ai-hero-title {
        font-size: 40px;
    }
    .ai-article-wrap {
        padding: 40px;
    }
    .ai-news-toolbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .ai-news-cats {
        max-width: 100%;
        justify-content: flex-start;
    }
    .ai-quiz-result-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    .ai-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}

@media (max-width: 768px) {
    .ai-nav-list {
        display: none;
    }
    .ai-bento-grid {
        grid-template-columns: 1fr;
    }
    .ai-stats-wrap {
        flex-direction: column;
        gap: 30px;
    }
    .ai-footer-grid {
        grid-template-columns: 1fr;
    }
    .ai-hero {
        padding: 120px 0 60px;
    }
    .ai-card-horizontal {
        flex-direction: column;
    }
    .ai-card-horizontal .ai-card-img {
        width: 100%;
        height: 200px;
    }
    .ai-news-toolbar {
        padding: 22px 20px;
        margin-bottom: 28px;
    }
    .ai-news-toolbar-title {
        font-size: 24px;
    }
    .ai-news-card .ai-card-body {
        padding: 22px 20px;
    }
    .ai-news-card-top {
        flex-direction: column;
        align-items: flex-start;
    }
    .ai-news-card .ai-card-title {
        font-size: 20px;
    }
    .ai-pagination .pagination li a,
    .ai-pagination .pagination li span {
        min-width: 38px;
        height: 38px;
        padding: 0 12px;
        font-size: 13px;
        border-radius: 10px;
    }
    .ai-pagination .pagination li:first-child a,
    .ai-pagination .pagination li:first-child span,
    .ai-pagination .pagination li:last-child a,
    .ai-pagination .pagination li:last-child span {
        min-width: 46px;
        font-size: 16px;
    }
    .ai-article-wrap {
        padding: 20px;
    }
    .ai-page-banner-title {
        font-size: 32px;
    }
    .ai-article-nav {
        flex-direction: column;
    }
    .ai-article-prev, .ai-article-next {
        max-width: 100%;
    }
    .ai-login-header,
    .ai-login-body,
    .ai-quiz-header,
    .ai-quiz-body,
    .ai-quiz-result-card,
    #stepReview,
    .ai-quiz-records,
    .ai-quiz-intro-card {
        padding-left: 20px;
        padding-right: 20px;
    }
    .ai-login-header {
        padding-top: 30px;
        padding-bottom: 20px;
    }
    .ai-login-header h3,
    .ai-quiz-header h3,
    .ai-quiz-result-card h2 {
        font-size: 24px;
    }
    .ai-login-error {
        margin-left: 20px;
        margin-right: 20px;
    }
    .ai-quiz-user-card {
        min-width: 100%;
    }
    .ai-quiz-user-meta {
        width: 100%;
    }
    .ai-quiz-intro-head,
    .ai-quiz-footer,
    .ai-quiz-result-actions,
    .ai-quiz-review-actions {
        flex-direction: column;
    }
    .ai-quiz-footer .ai-btn,
    .ai-quiz-result-actions .ai-btn,
    .ai-quiz-review-actions .ai-btn {
        width: 100%;
    }
    .ai-quiz-question h4 {
        font-size: 18px;
    }
    .ai-quiz-question-badge {
        display: block;
        width: fit-content;
        margin: 10px 0 0 46px;
    }
    .ai-quiz-result-stats {
        grid-template-columns: 1fr;
    }
    .ai-cert-card-header-bar,
    .ai-cert-card-body,
    .ai-cert-result-header,
    .ai-cert-result-body,
    .ai-cert-tips-new {
        padding-left: 20px;
        padding-right: 20px;
    }
    .ai-cert-card-header-bar {
        align-items: flex-start;
        padding-top: 24px;
        padding-bottom: 20px;
    }
    .ai-cert-card-icon-circle {
        width: 60px;
        height: 60px;
        font-size: 24px;
        border-radius: 18px;
    }
    .ai-cert-card-header-bar h3,
    .ai-cert-result-header h3 {
        font-size: 22px;
    }
    .ai-cert-field {
        padding: 16px;
        gap: 12px;
    }
    .ai-cert-field-icon {
        width: 46px;
        height: 46px;
        font-size: 18px;
        border-radius: 14px;
    }
    .ai-cert-info-value {
        font-size: 16px;
    }
    .ai-cert-tips-title {
        font-size: 20px;
    }
}