/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - 参考风格配色 */
    --blurple: #5865F2;
    --blurple-dark: #4752C4;
    --bg-light: #F6F6F6;
    --bg-secondary: #FFFFFF;
    --text-dark: #23272A;
    --text-soft: #4f5660;
    --card-bg: #ffffff;
    --accent-orange: #ED754A;
    --blurple-dark: #4752C4;
    --border-soft: #e5e7eb;
    --primary-soft: rgba(88, 101, 242, 0.1);
    
    /* 兼容旧变量名 */
    --bg-primary: var(--bg-light);
    --bg-tertiary: #EEEEEE;
    --text-primary: var(--text-dark);
    --text-secondary: var(--text-soft);
    
    --accent-cyan: var(--blurple);
    --accent-purple: var(--blurple-dark);
    
    /* Glass effects - 浅色主题 */
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-border: rgba(0, 0, 0, 0.06);
    
    /* Spacing */
    --container-width: 1200px;
    --section-padding: 120px 20px;
    
    /* Effects */
    --blur-amount: 10px;
    --transition-base: 0.25s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Inter", "PingFang SC", 'Segoe UI', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-width);
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border-bottom: 1px solid var(--glass-border);
    padding: 14px 0;
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.logo {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.5px;
    color: var(--blurple);
}

.logo-subtitle {
    font-size: 11px;
    color: var(--text-soft);
    font-weight: 300;
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0;
    flex: 1;
    justify-content: center;
}

.nav-menu li {
    margin: 0;
    position: relative;
}

.nav-menu a {
    margin: 0 14px;
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 15px;
    position: relative;
    transition: color var(--transition-base);
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-menu a i,
.nav-menu a svg {
    width: 14px;
    height: 14px;
    transition: transform var(--transition-base);
}

/* 下拉菜单 */
.nav-menu li.has-dropdown:hover a i,
.nav-menu li.has-dropdown:hover a svg {
    transform: rotate(180deg);
}

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    margin-top: 10px;
    background: #ffffff;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 1000;
    list-style: none;
    padding: 8px 0;
}

.nav-menu li.has-dropdown:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.nav-dropdown li {
    margin: 0;
}

.nav-dropdown a {
    display: block;
    padding: 12px 20px;
    margin: 0;
    color: var(--text-dark);
    font-size: 14px;
    border-radius: 0;
}

.nav-dropdown a::after {
    display: none;
}

.nav-dropdown a:hover {
    background: rgba(88, 101, 242, 0.05);
    color: var(--blurple);
}

.nav-dropdown a.active {
    background: rgba(88, 101, 242, 0.1);
    color: var(--blurple);
    font-weight: 600;
}

.nav-menu a:hover {
    color: var(--text-dark);
}

.nav-menu a:hover::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -5px;
    width: 20px;
    height: 3px;
    background: var(--accent-orange);
    border-radius: 3px;
}

.nav-menu a.active {
    color: var(--blurple);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mobile-menu-btn {
    display: none;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.78);
    color: var(--text-dark);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: inherit;
}

.mobile-menu-btn:hover {
    border-color: rgba(88, 101, 242, 0.4);
    color: var(--blurple);
}

.mobile-menu-btn svg {
    width: 18px;
    height: 18px;
}

.nav-user-entry {
    width: 36px;
    height: 36px;
    border-radius: 999px;
    border: 1px solid var(--blurple);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    background: var(--blurple);
    text-decoration: none;
    transition: all var(--transition-base);
}

.nav-user-entry:hover {
    border-color: var(--blurple-dark);
    color: #ffffff;
    background: var(--blurple-dark);
    transform: translateY(-1px);
}

.nav-user-entry svg,
.nav-user-entry i {
    width: 17px;
    height: 17px;
}

.nav-user-entry.is-admin {
    border-color: var(--blurple);
    color: #ffffff;
    background: var(--blurple);
}

.nav-admin-link {
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 12px;
    border-radius: 999px;
    border: 1px solid rgba(88, 101, 242, 0.45);
    color: var(--blurple);
    background: rgba(88, 101, 242, 0.08);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: all var(--transition-base);
}

.nav-admin-link:hover {
    border-color: var(--blurple);
    background: rgba(88, 101, 242, 0.16);
}

.lang-switch {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-dark);
    padding: 8px 16px;
    border-radius: 24px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all var(--transition-base);
}

.lang-switch:hover {
    border-color: var(--accent-orange);
    color: var(--text-dark);
}

/* Buttons */
.btn-primary {
    background: var(--blurple);
    color: white;
    padding: 8px 20px;
    border-radius: 24px;
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    display: inline-block;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--blurple-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(88, 101, 242, 0.3);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.55);
    border: 1px solid var(--glass-border);
    color: var(--text-dark);
    padding: 8px 20px;
    border-radius: 24px;
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    display: inline-block;
    transition: all var(--transition-base);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
}

.btn-secondary:hover {
    border-color: var(--accent-orange);
    background: rgba(255, 255, 255, 0.75);
}

.btn-try-ar {
    font-size: 15px;
    padding: 8px 20px;
}

/* Glass Card */
.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border-radius: 20px;
    padding: 32px;
    transition: all var(--transition-base);
}


/* Hero Section - AR 透视镜 (性能优化版) */
.hero-interactive {
    position: relative;
    height: 85vh;
    width: 100%;
    overflow: hidden;
    background: #f0f0f0;
    padding-top: 80px;
    /* 定义 CSS 变量初始值，放在父级 */
    --x: 50%;
    --y: 50%;
    --mask-size: 0px;
    cursor: none;
}

/* 隐藏 hero 区域内所有可点击元素的小手光标 */
.hero-interactive * {
    cursor: none !important;
}

.layer {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    pointer-events: none;
}

/* === 层1：现实 (Reality) === */
.layer-reality {
    background-color: #f8f9fa;
    background-image: 
        linear-gradient(#e5e7eb 1px, transparent 1px),
        linear-gradient(90deg, #e5e7eb 1px, transparent 1px);
    background-size: 40px 40px;
    filter: grayscale(100%);
    opacity: 0.6;
    position: relative;
}

/* 四周边缘渐变 */
.layer-reality::before {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: 
        linear-gradient(to bottom, rgba(88, 101, 242, 0.12) 0%, transparent 6%),
        linear-gradient(to top, rgba(88, 101, 242, 0.12) 0%, transparent 6%),
        linear-gradient(to right, rgba(88, 101, 242, 0.12) 0%, transparent 6%),
        linear-gradient(to left, rgba(88, 101, 242, 0.12) 0%, transparent 6%);
    background-size: 100% 6%, 100% 6%, 6% 100%, 6% 100%;
    background-position: top, bottom, left, right;
    background-repeat: no-repeat;
    z-index: 1;
}

.hero-title-outline {
    font-size: 80px;
    font-weight: 900;
    color: transparent;
    -webkit-text-stroke: 2px #d1d5db;
    margin-bottom: 20px;
    letter-spacing: -2px;
}

.hero-desc {
    font-size: 18px;
    color: #9ca3af;
    margin-bottom: 60px;
}

.card-outline {
    width: 260px;
    height: 160px;
    border: 2px dashed #d1d5db;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: #9ca3af;
}

.card-outline i,
.card-outline svg {
    width: 48px;
    height: 48px;
}

.card-outline span {
    font-size: 16px;
    font-weight: 500;
}

/* === 层2：增强 (Augmented) === */
.layer-augmented {
    background-color: #ffffff;
    z-index: 20;
    will-change: clip-path;
    /* 直接绑定 CSS 变量，不使用 transition */
    clip-path: circle(var(--mask-size) at var(--x) var(--y));
}

.bg-gradient-mesh {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 30%, rgba(88, 101, 242, 0.15) 0%, transparent 60%),
        radial-gradient(circle at 80% 70%, rgba(237, 117, 74, 0.15) 0%, transparent 60%);
    pointer-events: none;
}

.hero-title-filled {
    font-size: 80px;
    font-weight: 900;
    color: var(--text-dark);
    margin-bottom: 20px;
    letter-spacing: -2px;
}

.hero-desc-highlight {
    font-size: 18px;
    color: var(--blurple);
    font-weight: 600;
    margin-bottom: 60px;
    background: rgba(88, 101, 242, 0.1);
    padding: 8px 16px;
    border-radius: 20px;
}

.cards-grid {
    display: flex;
    gap: 24px;
    pointer-events: auto;
}

/* === 卡片样式 (轻量版) === */
/* 去掉 backdrop-filter，改用纯色透明度，性能提升极大 */
.glass-card-lite {
    width: 260px;
    height: 160px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-decoration: none;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0,0,0,0.05);
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(88, 101, 242, 0.1);
    transition: transform 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.glass-card-lite:hover {
    transform: scale(1.05);
}

.card-icon-bg {
    width: 40px;
    height: 40px;
    background: rgba(88, 101, 242, 0.1);
    color: var(--blurple);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-icon-bg.orange {
    background: rgba(237, 117, 74, 0.1);
    color: var(--accent-orange);
}

.card-icon-bg i,
.card-icon-bg svg {
    width: 24px;
    height: 24px;
}

.card-text {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.card-text h3 {
    font-size: 18px;
    color: #222;
    margin: 0;
}

.card-meta {
    font-size: 12px;
    color: #888;
    font-family: monospace;
}

/* === 光标圈 (装饰) === */
.cursor-ring {
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 40px;
    transform: translate(calc(var(--x) - 50%), calc(var(--y) - 50%));
    pointer-events: none;
    z-index: 30;
    will-change: transform, opacity;
    opacity: 0;
    animation: none;
}

.cursor-ring svg {
    width: 100%;
    height: 100%;
    stroke: var(--blurple);
    stroke-width: 5; /* 增加 stroke-width，因为 viewBox 是 0 0 100 100 */
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    transform: rotate(-38deg); /* 旋转38度，让箭头指向右上角 */
}

.cursor-ring svg path {
    transition: d 0.3s ease-in-out;
}

.hero-interactive:hover .cursor-ring {
    opacity: 1;
    animation: breathe 4s ease-in-out infinite;
}

@keyframes breathe {
    0%, 100% {
        opacity: 0.15;
    }
    50% {
        opacity: 0.8;
    }
}

.ar-hud {
    position: absolute;
    top: 40px;
    left: 40px;
    font-family: monospace;
    color: var(--blurple);
    border: 1px solid var(--blurple);
    padding: 4px 8px;
    font-size: 12px;
    background: rgba(255, 255, 255, 0.9);
}

/* 移动端禁用：因为手机没有 hover 且 clip-path 费电 */
@media (max-width: 768px) {
    .hero-interactive {
        height: auto;
        min-height: 0;
        padding-top: 0;
        overflow: visible;
        cursor: auto;
        --mask-size: 150%;
    }

    .layer {
        position: relative;
        inset: auto;
        height: auto;
        min-height: 0;
        display: block;
        padding-top: calc(76px + env(safe-area-inset-top, 0px));
        padding-bottom: 14px;
    }
    
    .layer-reality {
        display: none;
    }
    
    .layer-augmented {
        clip-path: none;
    }
    
    .cursor-ring {
        display: none;
    }

    .ar-hud {
        display: none;
    }

    .hero-content {
        justify-content: flex-start;
        gap: 0;
    }
    
    .cards-grid {
        flex-direction: column;
        gap: 16px;
    }
    
    .hero-title-filled,
    .hero-title-outline {
        font-size: 40px;
        line-height: 1.06;
        margin-bottom: 14px;
        text-align: center;
    }

    .hero-desc-highlight,
    .hero-desc {
        margin-bottom: 26px;
    }
    
    .glass-card-lite {
        width: 100%;
        max-width: 360px;
        flex-direction: row;
        align-items: center;
        height: auto;
        padding: 20px;
    }
    
    .glass-card-lite .card-text {
        text-align: left;
        padding-left: 16px;
    }
}

@media (max-width: 640px) {
    .hero-title-outline, 
    .hero-title-filled {
        font-size: 32px;
    }
    
    .layer {
        padding-top: calc(70px + env(safe-area-inset-top, 0px));
        padding-bottom: 10px;
        min-height: 0;
    }

    .hero-desc-highlight,
    .hero-desc {
        margin-bottom: 20px;
        font-size: 15px;
        padding: 7px 14px;
    }

    .glass-card-lite {
        padding: 18px 16px;
        border-radius: 16px;
    }
}

@media (min-width: 769px) and (max-width: 968px) {
    .hero-title-outline, 
    .hero-title-filled {
        font-size: 50px;
    }
    
    .cards-grid {
        flex-direction: column;
    }
    
    .card-outline, 
    .card-active {
        width: 100%;
        max-width: 300px;
        height: 100px;
        flex-direction: row;
        align-items: center;
        justify-content: flex-start;
        padding: 20px;
    }
    
    .card-text {
        margin-left: 16px;
    }
}

/* Value Props */
.value-props {
    padding: var(--section-padding);
    background: var(--bg-light);
    opacity: 1 !important; /* 确保始终可见 */
}

.props-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 26px;
}

.prop-card {
    text-align: center;
}

.prop-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.prop-card h3 {
    font-size: 24px;
    margin-bottom: 12px;
    font-weight: 700;
    color: var(--text-dark);
}

.prop-card p {
    color: var(--text-soft);
    line-height: 1.8;
}

/* Timeline */
.timeline-section {
    padding: var(--section-padding);
    background: var(--bg-secondary);
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 60px;
    color: var(--text-dark);
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: -16px;
    left: 50%;
    transform: translateX(-50%);
    width: 140px;
    height: 3px;
    background: var(--accent-orange);
    border-radius: 2px;
}

.timeline {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    padding: 40px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent 0%,
        rgba(0, 0, 0, 0.1) 20%,
        rgba(0, 0, 0, 0.1) 80%,
        transparent 100%);
    z-index: 0;
}

.timeline-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    position: relative;
    z-index: 1;
}

.timeline-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--blurple);
    border: 3px solid var(--bg-secondary);
    box-shadow: 0 0 20px rgba(88, 101, 242, 0.4);
}

.timeline-content {
    text-align: center;
    min-width: 200px;
}

.timeline-year {
    font-size: 32px;
    font-weight: 700;
    color: var(--blurple);
    margin-bottom: 8px;
}

.timeline-label {
    font-size: 16px;
    color: var(--text-soft);
}

/* Cases Preview */
.cases-preview {
    padding: var(--section-padding);
    background: var(--bg-light);
    opacity: 1 !important; /* 确保始终可见 */
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 26px;
}

.case-card {
    overflow: hidden;
}

.case-thumbnail {
    width: 100%;
    height: 200px;
    margin-bottom: 20px;
    border-radius: 12px;
    overflow: hidden;
}

.case-placeholder {
    width: 100%;
    height: 100%;
    border-radius: 12px;
}

.case-game {
    background: linear-gradient(135deg, var(--blurple), var(--blurple-dark));
}

.case-face {
    background: linear-gradient(135deg, var(--blurple-dark), var(--accent-orange));
}

.case-web {
    background: linear-gradient(135deg, var(--accent-orange), var(--blurple));
}

.case-guide {
    background: linear-gradient(135deg, var(--blurple), rgba(237, 117, 74, 0.5));
}

.case-education {
    background: linear-gradient(135deg, rgba(237, 117, 74, 0.8), var(--blurple-dark));
}

.case-marketing {
    background: linear-gradient(135deg, var(--accent-orange), rgba(88, 101, 242, 0.6));
}

.case-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.55);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    font-size: 12px;
    color: var(--blurple);
    margin-bottom: 12px;
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
}

.case-card h4 {
    font-size: 18px;
    margin-bottom: 8px;
    font-weight: 700;
    color: var(--text-dark);
}

.case-card p {
    color: var(--text-soft);
    font-size: 14px;
    margin-bottom: 16px;
}

.case-link {
    color: var(--blurple);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: all var(--transition-base);
    display: inline-block;
}

.case-link:hover {
    color: var(--accent-orange);
    transform: translateX(4px);
}

/* Footer */
.footer {
    padding: 30px 40px 40px;
    background: #151515;
    color: white;
    border-top: 3px solid var(--accent-orange);
}

.footer-content {
    max-width: var(--container-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-about h4 {
    font-size: 24px;
    margin-bottom: 12px;
    color: white;
    position: relative;
}

.footer-about h4::before {
    content: "";
    position: absolute;
    left: -12px;
    top: 3px;
    width: 4px;
    height: 14px;
    background: var(--accent-orange);
    border-radius: 4px;
}

.footer-about p {
    color: #d2d2d2;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: flex-end;
}

.footer-links a {
    color: #d2d2d2;
    text-decoration: none;
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: var(--accent-orange);
}

.footer-bottom {
    max-width: var(--container-width);
    margin: 0 auto;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    color: #aaa;
    font-size: 13px;
}

.lang-switch-small {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #d2d2d2;
    padding: 6px 12px;
    border-radius: 16px;
    cursor: pointer;
    font-size: 12px;
    transition: all var(--transition-base);
}

.lang-switch-small:hover {
    color: white;
    border-color: var(--accent-orange);
}

/* Responsive */
@media (max-width: 968px) {
    .navbar {
        padding: 10px 0;
    }

    .nav-container {
        padding: 0 14px;
        gap: 12px;
    }

    .logo-text {
        font-size: 18px;
    }

    .logo-subtitle {
        font-size: 10px;
        letter-spacing: 0.8px;
    }

    .mobile-menu-btn {
        display: inline-flex;
        flex-shrink: 0;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 12px;
        right: 12px;
        max-height: calc(100dvh - 82px);
        overflow-y: auto;
        display: none;
        flex-direction: column;
        justify-content: flex-start;
        gap: 2px;
        padding: 10px;
        padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
        margin: 0;
        list-style: none;
        background: rgba(255, 255, 255, 0.97);
        border: 1px solid var(--glass-border);
        border-radius: 14px;
        box-shadow: 0 14px 32px rgba(15, 23, 42, 0.16);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        z-index: 1200;
        flex: none;
    }

    .navbar.mobile-open .nav-menu,
    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-menu a {
        margin: 0;
        padding: 11px 12px;
        border-radius: 10px;
        font-size: 15px;
        justify-content: space-between;
        gap: 10px;
    }

    .nav-menu a:hover {
        background: rgba(88, 101, 242, 0.08);
        color: var(--text-dark);
    }

    .nav-menu a:hover::after {
        display: none;
    }

    .nav-menu li.has-dropdown > a i,
    .nav-menu li.has-dropdown > a svg {
        margin-left: auto;
        transform: rotate(0deg);
    }

    .nav-menu li.has-dropdown.open > a i,
    .nav-menu li.has-dropdown.open > a svg {
        transform: rotate(180deg);
    }

    .nav-dropdown {
        position: static;
        transform: none;
        margin-top: 4px;
        margin-bottom: 8px;
        min-width: 0;
        width: 100%;
        border-radius: 10px;
        box-shadow: none;
        border-color: #e7ecf5;
        padding: 6px 0;
        opacity: 1;
        visibility: visible;
        display: none;
    }

    .nav-menu li.has-dropdown:hover .nav-dropdown {
        transform: none;
    }

    .nav-menu li.has-dropdown.open .nav-dropdown {
        display: block;
    }

    .nav-dropdown a {
        font-size: 14px;
        padding: 10px 12px;
    }

    .nav-actions {
        margin-left: auto;
        gap: 8px;
        flex-shrink: 0;
    }

    .nav-user-entry {
        width: 34px;
        height: 34px;
    }

    .nav-admin-link {
        display: none;
    }

    body.nav-menu-open {
        overflow: hidden;
    }
    
    .timeline {
        flex-direction: column;
        gap: 40px;
    }
    
    .timeline::before {
        width: 2px;
        height: 100%;
        top: 0;
        left: 50%;
        transform: translateX(-50%);
    }
    
    .props-grid {
        grid-template-columns: 1fr;
    }
    
    .cases-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links {
        align-items: center;
    }
}

@media (max-width: 640px) {
    .section-title {
        font-size: 28px;
    }
    
    .nav-container {
        padding: 0 10px;
        gap: 8px;
    }

    .logo-subtitle {
        display: none;
    }

    .nav-menu {
        top: 60px;
        left: 8px;
        right: 8px;
        max-height: calc(100dvh - 70px);
    }
    
    .nav-actions {
        gap: 8px;
    }
    
    .btn-try-ar {
        font-size: 13px;
        padding: 8px 16px;
    }
    
    .footer {
        padding: 60px 20px 40px;
    }
}

@media (max-width: 420px) {
    .logo-text {
        font-size: 16px;
    }

    .nav-container {
        gap: 6px;
    }

    .nav-actions {
        gap: 6px;
    }

    .mobile-menu-btn,
    .nav-user-entry {
        width: 32px;
        height: 32px;
    }

    .mobile-menu-btn svg,
    .nav-user-entry svg {
        width: 16px;
        height: 16px;
    }
}

/* Page Header Styles */
.page-header {
    padding: 90px 20px 20px;
    background: var(--bg-light);
}

.page-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-dark);
    margin: 0 0 12px 0;
    text-align: center;
}

.page-subtitle {
    font-size: 20px;
    color: var(--text-soft);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

/* Resources Page Styles */
.resources-main {
    padding: 20px 20px 80px;
    background: var(--bg-light);
    min-height: calc(100vh - 200px);
}

.resources-container {
    max-width: 1200px;
}

/* 主 Tabs：3D / 2D */
.primary-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 32px;
}

.primary-tabs-inner {
    display: inline-flex;
    background: #EBECEF;
    padding: 4px;
    border-radius: 12px;
}

.primary-tab {
    padding: 10px 24px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    color: #5F6368;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    user-select: none;
    border: none;
    background: transparent;
    font-family: inherit;
}

.primary-tab:hover {
    color: #23272A;
}

.primary-tab.active {
    background: #FFFFFF;
    color: #5865F2;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.primary-tab.active:hover {
    color: #5865F2;
}

/* Shell 容器 */
.shell {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border-radius: 20px;
    padding: 32px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

/* 二级 Tabs */
.secondary-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 4px 6px 0;
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 20px;
}

.secondary-tab {
    position: relative;
    border: none;
    background: transparent;
    color: var(--text-soft);
    padding: 10px 12px 12px;
    margin: 0 4px;
    cursor: pointer;
    white-space: nowrap;
    font-family: inherit;
    transition: all var(--transition-base);
    font-size: 0.875em;
}

.secondary-tab:hover {
    color: var(--text-dark);
}

.secondary-tab::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    border-radius: 2px;
    background: var(--accent-orange);
    transition: width 0.2s;
}

.secondary-tab.active {
    color: var(--blurple);
    font-weight: 600;
}

.secondary-tab.active::after {
    width: 26px;
}

/* 顶部提示 */
.notice {
    margin: 0 0 24px 0;
    padding: 16px 20px;
    border-radius: 12px;
    background: rgba(88, 101, 242, 0.08);
    border: 1px solid rgba(88, 101, 242, 0.15);
    color: var(--text-dark);
    display: flex;
    align-items: center;
    gap: 10px;
    line-height: 1.6;
    font-size: 0.875em;
}

.notice-icon {
    width: 8px;
    height: 8px;
    border-radius: 999px;
    background: var(--accent-orange);
    flex-shrink: 0;
}

/* 内容区域：卡片布局 */
.content-row {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1.6fr);
    gap: 18px;
}

.section {
    display: none;
}

.section.active {
    display: grid;
}

.panel {
    display: none;
}

.panel.active {
    display: block;
    margin-top: -40px;
}

/* 左侧主卡 */
.main-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border-radius: 20px;
    padding: 28px 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.main-card-tag {
    display: inline-block;
    font-size: 11px;
    padding: 4px 10px;
    border-radius: 12px;
    background: rgba(88, 101, 242, 0.1);
    color: var(--blurple);
    margin-bottom: 12px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.main-card-title {
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 8px 0;
}

.main-card-title h3 {
    margin: 0;
}

.main-card-desc {
    color: var(--text-soft);
    margin: 0 0 16px 0;
    line-height: 1.7;
}

.main-card-text {
    color: var(--text-dark);
    margin: 0 0 0 0;
    line-height: 1.8;
}

.main-card-text strong {
    color: var(--blurple);
    font-weight: 600;
}

.pill-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.pill {
    padding: 4px 10px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.03);
    font-size: 12px;
    color: var(--text-soft);
    line-height: 1.5;
}

.pill-strong {
    background: rgba(88, 101, 242, 0.1);
    color: var(--blurple);
    font-weight: 600;
}

.main-card-note {
    color: var(--text-soft);
    border-top: 1px dashed var(--glass-border);
    padding-top: 12px;
    margin-top: 12px;
    line-height: 1.6;
    font-size: 0.875em;
}

/* 右侧细则卡 */
.detail-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border-radius: 20px;
    padding: 24px;
}

.detail-title {
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 8px 0;
}

.detail-title h4 {
    margin: 0;
}

.detail-text {
    color: var(--text-soft);
    margin: 0 0 16px 0;
    line-height: 1.7;
}

.detail-list {
    list-style: none;
    padding: 0;
    margin: 0;
    color: var(--text-soft);
}

.detail-list li {
    position: relative;
    padding-left: 20px;
    margin: 8px 0;
    line-height: 1.7;
}

.detail-list li::before {
    content: "•";
    position: absolute;
    left: 6px;
    top: 0;
    color: var(--accent-orange);
    font-weight: bold;
    font-size: 16px;
}

.detail-list strong {
    color: var(--blurple);
    font-weight: 600;
}

/* 身体检测部分：标题不使用蓝色 */
[data-section-content="body"] .detail-list strong {
    color: var(--text-dark);
}

/* 音频识别部分：标题不使用蓝色 */
[data-section-content="audio"] .detail-list strong {
    color: var(--text-dark);
}

/* 占位样式 */
.placeholder {
    padding: 60px 24px;
    text-align: center;
    color: var(--text-soft);
    line-height: 1.8;
}

.placeholder strong {
    color: var(--text-dark);
    font-weight: 600;
}

@media (max-width: 968px) {
    .page-header {
        padding: 90px 20px 16px;
    }
    
    .page-title {
        font-size: 36px;
        margin-bottom: 10px;
    }
    
    .page-subtitle {
        font-size: 18px;
    }
    
    .resources-main {
        padding: 16px 16px 60px;
    }
    
    .content-row {
        grid-template-columns: 1fr;
    }
    
    .secondary-tabs {
        gap: 8px;
        padding: 4px 4px 0;
    }
    
    .secondary-tab {
        padding: 8px 4px 10px;
        margin: 0 6px;
        font-size: 13px;
    }
}

@media (max-width: 640px) {
    .page-header {
        padding: 80px 16px 16px;
    }
    
    .page-title {
        font-size: 28px;
        margin-bottom: 10px;
    }
    
    .page-subtitle {
        font-size: 18px;
    }
    
    .resources-main {
        padding: 12px 12px 40px;
    }
    
    .primary-tabs-inner {
        padding: 3px;
    }
    
    .primary-tab {
        min-width: 80px;
        padding: 6px 14px;
        font-size: 13px;
    }
    
    .shell {
        padding: 24px 20px;
        border-radius: 20px;
    }
    
    .secondary-tabs {
        gap: 4px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 8px;
        margin-bottom: 16px;
    }
    
    .secondary-tab {
        padding: 8px 10px 10px;
        margin: 0 2px;
        font-size: 13px;
    }
    
    .content-row {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .main-card {
        padding: 24px 20px;
    }
    
    .detail-card {
        padding: 20px;
    }
    
    .notice {
        padding: 14px 16px;
    }
    
    .placeholder {
        padding: 40px 20px;
    }
}