/* ========================================
   设计系统 - Design Token System
   ======================================== */

:root {
    /* 颜色系统 - Color System */
    --color-primary-50: #E3F2FD;
    --color-primary-100: #BBDEFB;
    --color-primary-200: #90CAF9;
    --color-primary-300: #64B5F6;
    --color-primary-400: #42A5F5;
    --color-primary-500: #0077B6;  /* 天蓝色主色 */
    --color-primary-600: #006699;
    --color-primary-700: #00557A;
    --color-primary-800: #00445C;
    --color-primary-900: #00353E;

    --color-secondary-50: #F8F9FA;
    --color-secondary-100: #F1F3F5;
    --color-secondary-200: #E9ECEF;
    --color-secondary-300: #DEE2E6;
    --color-secondary-400: #CED4DA;
    --color-secondary-500: #ADB5BD;
    --color-secondary-600: #6C757D;
    --color-secondary-700: #495057;
    --color-secondary-800: #343A40;
    --color-secondary-900: #212529;

    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;

    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F7FAFC;
    --color-bg-tertiary: #EDF2F7;

    /* 字体系统 - Typography System */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-family-secondary: 'JetBrains Mono', 'Fira Code', monospace;

    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */
    --font-size-5xl: 3rem;       /* 48px */
    --font-size-6xl: 3.75rem;   /* 60px */

    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* 间距系统 - Spacing System */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;      /* 48px */
    --space-16: 4rem;      /* 64px */
    --space-20: 5rem;      /* 80px */
    --space-24: 6rem;      /* 96px */

    /* 阴影系统 - Shadow System */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* 过渡系统 - Transition System */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

    /* 圆角系统 - Border Radius System */
    --radius-sm: 0.25rem;   /* 4px */
    --radius-md: 0.375rem;  /* 6px */
    --radius-lg: 0.5rem;    /* 8px */
    --radius-xl: 0.75rem;   /* 12px */
    --radius-2xl: 1rem;     /* 16px */
    --radius-3xl: 1.5rem;   /* 24px */
    --radius-full: 9999px;

    /* 容器宽度 - Container Widths */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
}

/* ========================================
   全局样式 - Global Styles
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-secondary-800);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 100%;
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
    transition: all var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
}

/* ========================================
   导航栏 - Navbar
   ======================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.brand-text {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-500);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-secondary-600);
    padding: var(--space-2) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-primary-500);
    transform: scaleX(0);
    transition: transform var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-primary-500);
}

.nav-link:hover::after {
    transform: scaleX(1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.btn-lang {
    padding: var(--space-2) var(--space-3);
    border: 2px solid var(--color-primary-500);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary-500);
    background-color: transparent;
}

.btn-lang:hover {
    background-color: var(--color-primary-500);
    color: var(--color-white);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-secondary-800);
    transition: all var(--transition-fast);
}

/* ========================================
   按钮系统 - Button System
   ======================================== */

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    background-color: var(--color-primary-500);
    color: var(--color-white);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.btn-primary:hover {
    background-color: var(--color-primary-600);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    background-color: transparent;
    color: var(--color-primary-500);
    font-weight: var(--font-weight-medium);
    border: 2px solid var(--color-primary-500);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.btn-outline:hover {
    background-color: var(--color-primary-500);
    color: var(--color-white);
    transform: translateY(-2px);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-lg);
}

.btn-block {
    width: 100%;
}

/* ========================================
   Hero区域 - 视频网格横幅
   ======================================== */

.hero {
    padding: var(--demo__spacing--xxl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    background: var(--demo__gradient);
}

/* 3D 卡片主体 */
.flip-card {
    width: 260px;
    height: 360px;
    cursor: pointer;
    perspective: 1200px;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner {
    transform: rotateY(180deg);
}

/* 正面 & 背面公共 */
.flip-card-front,
.flip-card-back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: 20px;
    overflow: hidden;
}

/* ---- 正面 ---- */
.flip-card-front {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border: 1px solid var(--color-secondary-200);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

.flip-card-glow {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(ellipse at 50% 0%, rgba(0, 119, 182, 0.08) 0%, transparent 60%);
}

.flip-card-img-bg {
    position: absolute;
    inset: 0;
    opacity: 0.06;
    background-size: cover;
    background-position: center;
}

.flip-card-bg--destiny {
    background: 
        radial-gradient(circle at 30% 40%, #0077B6 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, #00B4D8 0%, transparent 50%);
}

.flip-card-bg--hunter {
    background: 
        radial-gradient(circle at 50% 30%, #0077B6 0%, transparent 50%),
        radial-gradient(circle at 40% 70%, #48CAE4 0%, transparent 50%);
}

.flip-card-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-8) var(--space-6);
}

.flip-card-icon-wrap {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    background: linear-gradient(135deg, #0077B6, #00B4D8);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 32px rgba(0, 119, 182, 0.3);
    margin-bottom: var(--space-4);
}

.flip-card-icon {
    font-size: 36px;
    font-weight: 700;
    color: var(--color-white);
    line-height: 1;
}

.flip-card-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-secondary-900);
    margin: 0;
}

.flip-card-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-secondary-500);
    margin: 0;
    text-align: center;
}

.flip-card-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
    background: linear-gradient(135deg, #0077B6, #00B4D8);
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.flip-card-badge--new {
    background: linear-gradient(135deg, #0096C7, #48CAE4);
}

/* ---- 背面 ---- */
.flip-card-back {
    background: linear-gradient(135deg, #0077B6, #023E8A);
    transform: rotateY(180deg);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 32px rgba(0, 119, 182, 0.25);
}

.flip-card-back-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: 
        radial-gradient(ellipse at 30% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
}

.flip-card-back-content {
    position: relative;
    z-index: 1;
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    width: 100%;
    box-sizing: border-box;
}

.flip-card-back-content h4 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    margin: 0;
    text-align: center;
}

.flip-card-features {
    list-style: none;
    padding: 0;
    margin: 0;
    width: 100%;
}

.flip-card-features li {
    padding: 8px 0;
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    text-align: center;
    transition: all var(--transition-fast);
}

.flip-card-features li:last-child {
    border-bottom: none;
}

.flip-card-price {
    display: inline-block;
    margin-top: var(--space-3);
    padding: 4px 16px;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    backdrop-filter: blur(4px);
}

/* ---- 3D 阴影 ---- */
.flip-shadow {
    width: 180px;
    height: 16px;
    margin-top: -8px;
    background: radial-gradient(ellipse, rgba(0, 0, 0, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    transform: scaleX(1);
}

.flip-card-wrapper:hover .flip-shadow {
    transform: scaleX(0.6);
    opacity: 0.3;
    background: radial-gradient(ellipse, rgba(0, 119, 182, 0.3) 0%, transparent 70%);
}

/* 大图内徽章 */
   产品展示区 - Products Section
   ======================================== */

.products {
    padding: var(--space-20) 0 var(--space-24);
    background-color: var(--color-bg);
}

/* products section 需要更大的容器宽度来容纳两张 800px 卡片并排 */
/* 1632px(卡片) + 64px(container padding) + 48px(grid padding) = 1744px → 取 1750px */
.products .container {
    max-width: 1750px;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-secondary-900);
    margin-bottom: var(--space-3);
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--color-secondary-500);
    max-width: 600px;
    margin: 0 auto;
}

/* ==========================================
   产品网格 - Products Grid
   超宽风格：2款产品并排，每张 800px 宽，居中排列
   ≥1700px: 2列(每卡 800px)
   <1700px: 自适应缩放
   <900px:  单列堆叠
   ========================================== */

.products-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-8);
    max-width: 1720px; /* 800*2 + gaps + padding */
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* 每张卡片固定 800px 宽 */
.product-card {
    width: 800px;
    max-width: 100%;
}

/* 超大屏幕 ≥1700px：2列并排，每卡 800px */
@media (min-width: 1700px) {
    .products-grid {
        gap: var(--space-8);
    }

    .product-card {
        width: 800px;
        flex-shrink: 0;
    }
}

/* 中等屏幕 900px-1699px：两张卡自适应等分宽度，保持并排 */
@media (max-width: 1699px) and (min-width: 900px) {
    .product-card {
        width: calc(50% - var(--space-4));
        min-width: 420px;
    }
}

/* ==========================================
   产品卡片 - Product Card (超宽+大图版)
   结构：
   ┌─────────────────────┐
   │   [Hero 大图区域]   │ ← 渐变背景 + 图标 + 徽章
   ├─────────────────────┤
   │ 🎨 名称             │ ← header
   │ 简介...             │ ← desc
   │ url.cc →            │ ← url link
   │ [tag][tag][tag]     │ ← feature tags
   └─────────────────────┘
   ========================================== */

.product-card {
    position: relative;
    background-color: var(--color-white);
    border: 1px solid var(--color-secondary-200);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-sm);
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.product-card:hover {
    border-color: var(--color-primary-300);
    box-shadow: var(--shadow-xl), 0 12px 40px rgba(0, 119, 182, 0.15);
    transform: translateY(-8px);
}

.product-card:hover .product-hero-bg {
    transform: scale(1.08);
}

.product-card:hover .hero-screenshot {
    transform: scale(1.05);
}

.product-card--placeholder {
    border-style: dashed;
    opacity: 0.5;
}

.product-card--placeholder:hover {
    opacity: 0.85;
    border-style: solid;
    border-color: var(--color-primary-300);
}

/* ========== 顶部大图区 - Hero Image Area ========== */

.product-hero {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
    flex-shrink: 0;
}

/* 名中注定：深蓝渐变 */
.product-hero--dark {
    background:
        radial-gradient(circle at 30% 40%, rgba(255,255,255,0.12) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(0,180,216,0.18) 0%, transparent 50%),
        linear-gradient(135deg, #003B5C 0%, #0077B6 50%, #48CAE4 100%);
}

/* 猎人AI笔记：天蓝渐变 */
.product-hero--blue {
    background:
        radial-gradient(ellipse at 20% 80%, rgba(255,255,255,0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(0,119,182,0.2) 0%, transparent 50%),
        linear-gradient(135deg, #005f92 0%, #0077B6 35%, #00B4D8 70%, #90E0EF 100%);
}

/* 占位卡背景 */
.product-hero--placeholder {
    background: linear-gradient(135deg, #F0F9FF 0%, #DBEAFA 50%, #E8F4FD 100%);
    height: 160px;
}

/* 光晕动效 */
.hero-glow {
    position: absolute;
    top: -30%;
    right: -20%;
    width: 80%;
    height: 160%;
    background: radial-gradient(ellipse, rgba(255,255,255,0.08) 0%, transparent 70%);
    pointer-events: none;
}

/* 产品截图 - 填充 Hero 区域 */
.hero-screenshot {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* 大图内徽章 */
.hero-badge {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    z-index: 3;
    padding: 4px 12px;
    background-color: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(8px);
    color: white;
    font-size: 11px;
    font-weight: 700;
    border-radius: var(--radius-full);
    letter-spacing: 0.5px;
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.hero-badge--new {
    background-color: rgba(16, 185, 129, 0.85);
    border-color: rgba(16, 185, 129, 0.3);
}

/* ========== 信息体 - Body ========== */

.product-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--space-5) var(--space-5) var(--space-4);
}

/* ---------- 卡片头部：图标 + 名称横排 ---------- */
.product-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

/* 小图标（信息区内左侧） */
.product-icon--sm {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: white;
    font-size: 18px;
    font-weight: 800;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.18);
}

.product-icon--sm svg {
    width: 28px;
    height: 20px;
}

.product-icon--placeholder-sm {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
    background: var(--color-bg-secondary);
    border: 2px dashed var(--color-secondary-300);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--color-secondary-400);
}

/* 产品名称 */
.product-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-secondary-900);
    line-height: 1.3;
}

/* ---------- 简介 ---------- */
.product-desc {
    font-size: var(--font-size-sm);
    color: var(--color-secondary-600);
    line-height: 1.65;
    margin-bottom: var(--space-3);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ---------- 网址链接 ---------- */
.product-url {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: var(--font-size-xs);
    color: var(--color-primary-500);
    font-weight: 600;
    margin-bottom: var(--space-4);
    transition: all var(--transition-fast);
    align-self: flex-start;
}

.product-url:hover {
    color: var(--color-primary-700);
    gap: 7px;
}

.product-url svg {
    flex-shrink: 0;
}

/* ---------- 功能标签网格 ---------- */
.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: auto;
}

/* 单个标签 pill 样式 */
.product-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 11px;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-secondary-200);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    color: var(--color-secondary-700);
    font-weight: 500;
    white-space: nowrap;
    transition: all var(--transition-fast);
    cursor: default;
}

.product-tag:hover {
    background-color: var(--color-primary-50);
    border-color: var(--color-primary-300);
    color: var(--color-primary-700);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 119, 182, 0.12);
}

/* 标签内的 emoji 图标 */
.tag-emoji {
    font-size: 13px;
    line-height: 1;
}

/* ==========================================
   功能详解 - Feature Detail Section
   产品标签导航 + 功能卡片网格
   ========================================== */

.features-detail {
    padding: var(--space-20) 0 var(--space-24);
    background-color: var(--color-bg);
}

.features-detail .container {
    max-width: 1700px !important;
}

/* 产品标签导航 */
.feature-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
    flex-wrap: wrap;
}

.feature-tab {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-8);
    background-color: var(--color-white);
    border: 2px solid var(--color-secondary-200);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-secondary-600);
    cursor: pointer;
    transition: all var(--transition-normal);
    user-select: none;
}

.feature-tab:hover {
    border-color: var(--color-primary-300);
    color: var(--color-primary-500);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.feature-tab--active {
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-400));
    border-color: var(--color-primary-500);
    color: var(--color-white);
    box-shadow: 0 4px 16px rgba(0, 119, 182, 0.3);
}

.feature-tab--active:hover {
    border-color: var(--color-primary-600);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0, 119, 182, 0.4);
}

.feature-tab-icon {
    font-size: var(--font-size-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: rgba(0, 119, 182, 0.1);
    flex-shrink: 0;
    font-weight: 700;
}

.feature-tab--active .feature-tab-icon {
    background: rgba(255, 255, 255, 0.25);
}

.feature-tab-name {
    white-space: nowrap;
}

/* 功能面板 */
.feature-panel {
    display: none;
}

.feature-panel--active {
    display: block;
    animation: featureFadeIn 0.4s ease;
}

@keyframes featureFadeIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 功能卡片网格 */
.feature-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.feature-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-secondary-200);
    border-radius: var(--radius-xl);
    padding: var(--space-8) var(--space-6);
    transition: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
    cursor: default;
}

.feature-card:hover {
    border-color: var(--color-primary-300);
    box-shadow: var(--shadow-lg), 0 4px 20px rgba(0, 119, 182, 0.08);
    transform: translateY(-4px);
}

.feature-card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
    display: block;
}

.feature-card-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-secondary-900);
    margin-bottom: var(--space-3);
}

.feature-card-desc {
    font-size: var(--font-size-sm);
    color: var(--color-secondary-500);
    line-height: var(--line-height-relaxed);
}

/* 功能详解响应式 */

@media (max-width: 1023px) {
    .feature-cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .feature-tab {
        padding: var(--space-3) var(--space-5);
        font-size: var(--font-size-base);
    }
}

@media (max-width: 639px) {
    .feature-cards {
        grid-template-columns: 1fr;
    }

    .feature-tabs {
        gap: var(--space-3);
    }

    .feature-tab {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-sm);
    }

    .feature-card {
        padding: var(--space-6) var(--space-5);
    }
}

/* ========================================
   定价区域 - 免费与VIP体系
   ======================================== */

.pricing {
    padding: var(--space-24) 0;
    background-color: var(--color-bg);
}

.pricing .container {
    max-width: 1200px !important;
}

/* 子区块 */
.pricing-section-block {
    margin-bottom: var(--space-16);
}

.pricing-section-block:last-child {
    margin-bottom: 0;
}

.pricing-section-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-secondary-900);
    margin-bottom: var(--space-3);
    text-align: center;
}

.pricing-section-desc {
    font-size: var(--font-size-base);
    color: var(--color-secondary-600);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-6);
}

.pricing-section-desc strong {
    color: var(--color-primary-600);
}

/* 表格容器 */
.pricing-table-wrap {
    overflow-x: auto;
    margin-bottom: var(--space-8);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-secondary-200);
}

.pricing-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--color-white);
    font-size: var(--font-size-base);
}

.pricing-table th {
    padding: var(--space-4) var(--space-6);
    text-align: left;
    font-weight: var(--font-weight-semibold);
    color: var(--color-secondary-500);
    background-color: var(--color-bg-secondary);
    border-bottom: 2px solid var(--color-secondary-200);
    font-size: var(--font-size-sm);
    white-space: nowrap;
}

.pricing-table td {
    padding: var(--space-4) var(--space-6);
    color: var(--color-secondary-700);
    border-bottom: 1px solid var(--color-secondary-100);
    line-height: var(--line-height-relaxed);
}

.pricing-table tbody tr:last-child td {
    border-bottom: none;
}

.pricing-table tbody tr:hover {
    background-color: var(--color-primary-50);
}

.table-check {
    font-size: var(--font-size-lg);
}

/* 定价表 - 高亮行 */
.pricing-table-row--highlight {
    background-color: #FFF8E1;
}

.pricing-table-row--highlight:hover {
    background-color: #FFF3CD !important;
}

/* 价格展示 */
.price-highlight {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-600);
    white-space: nowrap;
}

.price-badge {
    display: inline-block;
    margin-left: var(--space-2);
    padding: 2px var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: #DC3545;
    background-color: #FFE5E7;
    border-radius: var(--radius-sm);
    vertical-align: middle;
}

.price-original {
    font-size: var(--font-size-sm);
    color: var(--color-secondary-400);
    text-decoration: line-through;
}

/* 提示说明 */
.pricing-note {
    margin-bottom: var(--space-8);
    padding: var(--space-5);
    background: linear-gradient(135deg, #E3F2FD, #F0F8FF);
    border-radius: var(--radius-lg);
    border-left: 3px solid var(--color-primary-500);
}

.pricing-note p {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-secondary-700);
    line-height: var(--line-height-relaxed);
}

/* CTA 按钮区 */
.pricing-cta {
    text-align: center;
    padding: var(--space-8);
    background-color: var(--color-white);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--color-secondary-200);
}

.price-tag {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-600);
    margin-bottom: 4px;
    letter-spacing: 0.5px;
}

.price-tag-sub {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: #DC3545;
    margin-bottom: var(--space-6);
}

.pay-buttons {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

.pay-btn {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 14px 28px;
    border-radius: var(--radius-xl);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    min-width: 200px;
    justify-content: center;
}

.pay-btn--alipay {
    background: linear-gradient(135deg, #1677FF, #0958D9);
    color: white;
    box-shadow: 0 4px 14px rgba(22, 119, 255, 0.3);
}
.pay-btn--alipay:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(22, 119, 255, 0.4);
}

.pay-btn--paypal {
    background: linear-gradient(135deg, #003087, #009CDE);
    color: white;
    box-shadow: 0 4px 14px rgba(0, 48, 135, 0.3);
}
.pay-btn--paypal:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 48, 135, 0.4);
}

.pay-btn-icon { font-size: 1.3rem; }
.pay-btn-label { flex: 1; text-align: left; }
.pay-btn-price {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    opacity: 0.9;
}

/* 定价区域响应式 */
@media (max-width: 1023px) {
    .pricing-section-block {
        margin-bottom: var(--space-12);
    }
}

@media (max-width: 639px) {
    .pricing-table th,
    .pricing-table td {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-sm);
    }

    .pricing-cta {
        padding: var(--space-6);
    }
}

/* ========================================
   支付方式展示 - Payment Methods
   ======================================== */

.payment-methods {
    padding: var(--space-24) 0;
    background-color: var(--color-bg);
}

.payment-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
    max-width: 800px;
    margin: 0 auto;
}

.payment-method-card {
    padding: var(--space-8);
    background-color: var(--color-white);
    border: 2px solid var(--color-secondary-200);
    border-radius: var(--radius-2xl);
    text-align: center;
    transition: all var(--transition-normal);
}

.payment-method-card:hover {
    border-color: var(--color-primary-500);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.payment-logo {
    height: 50px;
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
}

.payment-method-card h4 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-secondary-900);
    margin-bottom: var(--space-2);
}

.payment-method-card p {
    font-size: var(--font-size-sm);
    color: var(--color-secondary-600);
}

/* ========================================
   联系区域 - Contact Section
   ======================================== */

.contact {
    padding: var(--space-24) 0;
    background-color: var(--color-bg-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.contact-info-card {
    padding: var(--space-8);
    background-color: var(--color-white);
    border-radius: var(--radius-2xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.contact-info-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.contact-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-4);
}

.contact-info-card h4 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-secondary-900);
    margin-bottom: var(--space-2);
}

.contact-info-card p {
    font-size: var(--font-size-base);
    color: var(--color-secondary-600);
}

/* ========================================
   留言板 - Message Board
   ======================================== */

.message-board {
    margin-top: var(--space-16);
    padding: var(--space-12);
    background-color: var(--color-white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
}

.message-board-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.message-board-header h3 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-secondary-900);
    margin-bottom: var(--space-2);
}

.message-board-header p {
    font-size: var(--font-size-base);
    color: var(--color-secondary-500);
}

.message-form {
    max-width: 800px;
    margin: 0 auto var(--space-8);
}

.message-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
}

.message-form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.message-form-group label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-secondary-700);
}

.message-form-group input,
.message-form-group textarea {
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-secondary-200);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-family: var(--font-family-primary);
    background-color: var(--color-bg);
    color: var(--color-secondary-900);
    transition: all var(--transition-fast);
    outline: none;
}

.message-form-group input:focus,
.message-form-group textarea:focus {
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px rgb(0 119 182 / 0.1);
    background-color: var(--color-white);
}

.message-form-group input::placeholder,
.message-form-group textarea::placeholder {
    color: var(--color-secondary-400);
}

.message-form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.message-submit {
    display: block;
    margin: var(--space-6) auto 0;
    padding: var(--space-3) var(--space-12);
    font-size: var(--font-size-base);
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, #0077B6, #00B4D8);
    color: white;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.message-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgb(0 119 182 / 0.3);
}

.message-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    max-width: 800px;
    margin: 0 auto;
    max-height: 500px;
    overflow-y: auto;
    padding: var(--space-4);
    border-top: 1px solid var(--color-secondary-100);
}

.message-item {
    padding: var(--space-5);
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    border-left: 3px solid var(--color-primary-500);
    transition: all var(--transition-fast);
}

.message-item:hover {
    background-color: var(--color-primary-50);
    border-left-color: var(--color-primary-600);
}

.message-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-2);
}

.message-item-name {
    font-weight: var(--font-weight-semibold);
    color: var(--color-secondary-900);
    font-size: var(--font-size-sm);
}

.message-item-time {
    font-size: var(--font-size-xs);
    color: var(--color-secondary-400);
}

.message-item-body {
    font-size: var(--font-size-base);
    color: var(--color-secondary-600);
    line-height: var(--line-height-relaxed);
}

.message-list-empty {
    text-align: center;
    padding: var(--space-12);
    color: var(--color-secondary-400);
    font-size: var(--font-size-base);
}

/* 留言板响应式 */
@media (max-width: 639px) {
    .message-form-row {
        grid-template-columns: 1fr;
    }

    .message-board {
        padding: var(--space-6);
        margin-top: var(--space-8);
    }

    .message-submit {
        width: 100%;
    }
}

/* ========================================
   页脚 - Footer
   ======================================== */

.footer {
    padding: var(--space-16) 0 var(--space-8);
    background-color: var(--color-secondary-900);
    color: var(--color-white);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-brand p {
    margin-top: var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--color-secondary-400);
    line-height: var(--line-height-relaxed);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.footer-logo .logo-icon {
    width: 40px;
    height: 40px;
}

.footer-logo span {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
}

.footer-links h4 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-4);
}

.footer-links a {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-secondary-400);
    padding: var(--space-2) 0;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-secondary-700);
    text-align: center;
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--color-secondary-400);
}

.preview-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.preview-feature-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-base);
    color: var(--color-secondary-700);
    padding: var(--space-2) 0;
}

.preview-feature-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}


/* ========================================
   响应式设计 - Responsive Design
   ======================================== */

/* 大屏幕 - Large screens (1280px and up) */
@media (min-width: 1280px) {
    .container {
        max-width: var(--container-xl);
        padding-left: var(--space-8);
        padding-right: var(--space-8);
    }

    .products-grid {
        gap: var(--space-8);
    }

    .product-hero {
        height: 220px;
    }
}

/* 桌面端 - Desktop (900px to 1279px): 自适应并排 */
@media (max-width: 1279px) and (min-width: 900px) {
    .products-grid {
        gap: var(--space-6);
    }

    .product-hero {
        height: 200px;
    }
}

/* 平板设备 - Tablet (768px to 899px): 单列 */
@media (max-width: 899px) {
    .products-grid {
        flex-direction: column;
        align-items: center;
        gap: var(--space-5);
        padding: 0 var(--space-5);
    }

    .product-card {
        width: 100%;
        max-width: 600px;
    }

    .product-hero {
        height: 160px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-8);
    }
}

/* 手机设备 - Mobile (639px and below) */
@media (max-width: 639px) {
    .container {
        padding: 0 var(--space-4);
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-white);
        padding: var(--space-4);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding: var(--demo__spacing--xl) 0;
    }

    .products-grid {
        flex-direction: column;
        align-items: center;
        gap: var(--space-5);
        padding: 0 var(--space-4);
    }

    .product-card {
        width: 100%;
        max-width: none;
    }

    .product-hero {
        height: 180px;
    }

    .product-name {
        font-size: var(--font-size-lg);
    }

    .product-header {
        margin-bottom: var(--space-3);
    }

    .payment-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
}

/* ========================================
   登录/注册模态框
   ======================================== */
.modal-overlay {
    position: fixed; inset: 0; z-index: 2000;
    background: rgba(0,0,0,0.45); backdrop-filter: blur(4px);
    display: none; align-items: center; justify-content: center;
    padding: 24px;
}
.modal-overlay.active { display: flex; }
.modal-content {
    background: #fff; border-radius: 20px; padding: 36px 32px 28px;
    max-width: 420px; width: 100%; position: relative;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    animation: modalIn 0.25s ease;
}
@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-close {
    position: absolute; top: 12px; right: 16px;
    font-size: 28px; color: var(--color-secondary-400);
    background: none; border: none; cursor: pointer; line-height: 1;
}
.modal-close:hover { color: var(--color-secondary-700); }
.modal-tabs { display: flex; gap: 0; margin-bottom: 24px; border-bottom: 2px solid var(--color-secondary-200); }
.modal-tab {
    flex: 1; padding: 12px; text-align: center; font-weight: 600;
    font-size: 1rem; color: var(--color-secondary-500);
    background: none; border: none; border-bottom: 2px solid transparent;
    margin-bottom: -2px; cursor: pointer; transition: all 0.2s;
}
.modal-tab--active { color: var(--color-primary-500); border-bottom-color: var(--color-primary-500); }
.auth-form { display: none; }
.auth-form--active { display: block; }
.auth-field { margin-bottom: 16px; }
.auth-field label { display: block; font-size: 0.85rem; font-weight: 500; color: var(--color-secondary-700); margin-bottom: 6px; }
.auth-field input {
    width: 100%; padding: 12px 14px; border: 1.5px solid var(--color-secondary-200);
    border-radius: 10px; font-size: 0.95rem; outline: none; transition: border 0.2s;
    box-sizing: border-box;
}
.auth-field input:focus { border-color: var(--color-primary-500); box-shadow: 0 0 0 3px rgba(0,119,182,0.1); }
.auth-error { color: #e53e3e; font-size: 0.85rem; margin-top: 8px; min-height: 20px; }

/* 用户菜单 */
.user-menu {
    position: fixed; top: 72px; right: 24px; z-index: 2001;
    background: #fff; border-radius: 14px; padding: 8px 0;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12); border: 1px solid var(--color-secondary-200);
    min-width: 200px;
}
.user-menu-header { padding: 12px 18px; border-bottom: 1px solid var(--color-secondary-100); font-size: 0.9rem; color: var(--color-secondary-800); font-weight: 600; }
.user-menu-item {
    display: flex; align-items: center; gap: 10px; padding: 10px 18px;
    font-size: 0.9rem; color: var(--color-secondary-700); cursor: pointer; transition: background 0.15s;
}
.user-menu-item:hover { background: var(--color-primary-50); }

/* ========================================
   动画 - Animations
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

/* ========================================
   无障碍 - Accessibility
   ======================================== */

:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

::selection {
    background-color: var(--color-primary-500);
    color: var(--color-white);
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ========================================
   滚动条 - Scrollbar
   ======================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background-color: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
    background-color: var(--color-secondary-400);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--color-secondary-500);
}

/* ========================================
   视频网格横幅 - Video Grid Banner
   ======================================== */

:root {
  --demo__spacing--sm: 10px;
  --demo__spacing--md: 20px;
  --demo__spacing--lg: 40px;
  --demo__spacing--xl: 60px;
  --demo__spacing--xxl: 80px;
  --demo__radius: 30px;
  --demo__radius--sm: 20px;
  --demo__font-weight--light: 300;
  --demo__font-weight--semi-bold: 500;
  --demo__color--bg-dark: #020318;
  --demo__color--bg-light: #1a1a4e;
  --demo__color--hero-text: white;
  --demo__gradient: linear-gradient(180deg, var(--demo__color--bg-dark), var(--demo__color--bg-light) 50%);
  --demo__icon--close: url("data:image/svg+xml,%3Csvg viewBox='0 0 22 22' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Crect x='0.5' y='0.5' width='20.9787' height='21' rx='10.4893' stroke='white'/%3E%3Cpath d='M13.9922 8L7.99219 14M7.99219 8L13.9922 14' stroke='white' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E%0A");
}

/* Star field */
.c-stars {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.c-stars__dot {
  position: absolute;
  border-radius: 50%;
  background: #fff;
  animation: twinkle var(--dur) ease-in-out infinite alternate;
  animation-delay: var(--delay);
}
@keyframes twinkle {
  0%   { opacity: var(--o-min, 0.15); transform: scale(0.8); }
  100% { opacity: var(--o-max, 0.95); transform: scale(1.2); }
}

/* Header & grid sit above stars */
.hero .c-video-section__header,
.hero .c-video-grid {
  position: relative;
  z-index: 1;
}

.c-video-section__header {
  margin-bottom: var(--demo__spacing--xxl);
  padding: 0 var(--demo__spacing--md);
}
.c-video-section__title {
  color: var(--demo__color--hero-text);
  font-size: 1.6em;
  font-weight: var(--demo__font-weight--light);
  text-transform: uppercase;
  margin: 0 0 8px 0;
}
.c-video-section__subtitle {
  font-size: 1.4em;
  font-weight: var(--demo__font-weight--semi-bold);
  margin: 0;
  color: #fff;
  text-shadow: 0 0 20px rgba(255,255,255,0.4);
}

.c-video-grid {
  align-items: center;
  display: grid;
  grid-gap: var(--demo__spacing--lg);
  grid-template-columns: repeat(3, 1fr);
  max-width: 1000px;
  margin: 0 auto;
  overflow-y: auto;
  max-height: 600px;
  padding: 0 var(--demo__spacing--lg);
}

.c-video-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.c-ex-video {
  align-items: center;
  aspect-ratio: 1;
  background: linear-gradient(135deg, rgba(20,20,60,0.85), rgba(40,40,80,0.7));
  border-radius: 140px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  position: relative;
  transition: all 0.5s ease-out;
  width: 280px;
}

.c-ex-video__close {
  aspect-ratio: 1;
  background: no-repeat center / 80%;
  background-image: var(--demo__icon--close);
  display: none;
  position: absolute;
  right: 5px;
  top: 5px;
  width: 32px;
  z-index: 10;
  cursor: pointer;
}

.c-ex-video.is-active {
  aspect-ratio: 9 / 16;
  border-radius: var(--demo__radius--sm);
  transition-duration: 0.3s;
}

.c-ex-video.is-active .c-ex-video__close {
  display: block;
}

/* Play button overlay */
.c-ex-video__playbtn {
  position: absolute;
  z-index: 2;
  width: 60px;
  height: 60px;
  pointer-events: none;
  top: 50%;
  left: 50%;
  transform: translate(-50%, calc(-50% + 15px));
}
.c-ex-video__playbtn svg {
  display: block;
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 2px 6px rgba(0,0,0,0.5));
}
.c-ex-video.is-active .c-ex-video__playbtn {
  display: none;
}

/* Text label overlay */
.c-ex-video__label {
  color: #fff;
  font-size: 18px;
  font-weight: var(--demo__font-weight--semi-bold);
  letter-spacing: 4px;
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 50%;
  transform: translate(-50%, calc(-50% - 35px));
  text-shadow: 0 0 10px rgba(0,0,0,0.7), 0 2px 4px rgba(0,0,0,0.5);
  pointer-events: none;
  white-space: nowrap;
}
.c-ex-video.is-active .c-ex-video__label {
  display: none;
}

.c-ex-video .video-js {
  width: 100%;
  height: 100%;
}

/* Hide Video.js big play button and controls when inactive */
.c-ex-video:not(.is-active) .vjs-big-play-button,
.c-ex-video:not(.is-active) .vjs-control-bar {
  display: none;
}

/* Video.js 9:16 aspect ratio */
.video-js.vjs-9-16 {
  --vjs-video-aspect-ratio: 16/9;
}
.video-js.vjs-9-16.vjs-fluid {
  padding-top: 177.78%;
}

/* Override Video.js control bar to show only on hover when active */
.c-ex-video.is-active .vjs-control-bar {
  opacity: 0;
  transition: opacity 0.2s;
}
.c-ex-video.is-active:hover .vjs-control-bar {
  opacity: 1;
}

/* Responsive: mobile */
@media (max-width: 768px) {
  .c-video-grid {
    grid-template-columns: 1fr;
    max-height: none;
    gap: var(--demo__spacing--lg);
  }
  .c-ex-video {
    width: 220px;
  }
  .c-video-section__title {
    font-size: 1.3em;
  }
  .c-video-section__subtitle {
    font-size: 1.1em;
  }
}