/* ============================================================
   GEO SaaS 商务官网 - 完整版 V4.1
   顶级国际化设计标准 | 蓝紫渐变主题
   ============================================================ */

/* ===== 隐藏滚动条但保持滚动 ===== */
html {
    scrollbar-width: none;
    -ms-overflow-style: none;
}

html::-webkit-scrollbar {
    width: 0;
    height: 0;
}

/* ===== 1. CSS 变量与基础 ===== */
:root {
    /* 品牌色 - 蓝紫色渐变 */
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --primary-rgb: 79, 70, 229;
    --primary-subtle: #eef2ff;
    --primary-hover: #6366f1;

    /* 蓝紫渐变变量 */
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #4f46e5 100%);
    --gradient-primary-hover: linear-gradient(135deg, #2563eb 0%, #4338ca 100%);
    --gradient-hero: linear-gradient(160deg, #1e3a8a 0%, #2563eb 30%, #4f46e5 60%, #7c3aed 100%);
    --gradient-stats: linear-gradient(135deg, #1e3a8a 0%, #4f46e5 50%, #7c3aed 100%);
    --gradient-cta: linear-gradient(135deg, #1e3a8a 0%, #4f46e5 40%, #7c3aed 100%);

    /* 辅助色 */
    --accent: #f59e0b;
    --accent-light: #fbbf24;
    --accent-subtle: #fffbeb;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;

    /* 中性色 */
    --gray-0: #ffffff;
    --gray-25: #fdfdfe;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* 圆角 */
    --radius-xs: 6px;
    --radius-sm: 10px;
    --radius: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    /* 阴影 */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.10);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.15);
    --shadow-primary: 0 8px 30px rgba(79, 70, 229, 0.25);
    --shadow-accent: 0 8px 30px rgba(245, 158, 11, 0.30);

    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.85rem;
    --font-size-base: 0.95rem;
    --font-size-md: 1.05rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --font-size-4xl: 3rem;

    /* 布局 */
    --max: 1200px;
    --header-height: 72px;

    /* 过渡 */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--gray-700);
    line-height: 1.65;
    background: var(--gray-0);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    font-size: var(--font-size-base);
}

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

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

.container {
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== 2. 滚动动画系统 ===== */
.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: opacity, transform;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 交错子元素动画 */
.stagger-children>* {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.stagger-children.visible>* {
    opacity: 1;
    transform: translateY(0);
}

.stagger-children.visible>*:nth-child(1) { transition-delay: 0.05s; }
.stagger-children.visible>*:nth-child(2) { transition-delay: 0.10s; }
.stagger-children.visible>*:nth-child(3) { transition-delay: 0.15s; }
.stagger-children.visible>*:nth-child(4) { transition-delay: 0.20s; }
.stagger-children.visible>*:nth-child(5) { transition-delay: 0.25s; }
.stagger-children.visible>*:nth-child(6) { transition-delay: 0.30s; }
.stagger-children.visible>*:nth-child(7) { transition-delay: 0.35s; }
.stagger-children.visible>*:nth-child(8) { transition-delay: 0.40s; }
.stagger-children.visible>*:nth-child(9) { transition-delay: 0.45s; }
.stagger-children.visible>*:nth-child(10) { transition-delay: 0.50s; }
.stagger-children.visible>*:nth-child(11) { transition-delay: 0.55s; }
.stagger-children.visible>*:nth-child(12) { transition-delay: 0.60s; }

/* ===== 3. Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(229, 231, 235, 0.6);
    transition: box-shadow var(--transition-base);
}

.header.header-scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--gray-900);
    font-size: 1.25rem;
}

.logo img {
    height: 38px;
    width: auto;
    border-radius: var(--radius-xs);
}

.logo-mark {
    width: 38px;
    height: 38px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.3rem;
    font-weight: 600;
    box-shadow: var(--shadow-primary);
}

.nav-links {
    display: flex;
    gap: 0.25rem;
    align-items: center;
}

.nav-links a {
    padding: 0.5rem 0.85rem;
    color: var(--gray-600);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 500;
    border-radius: var(--radius-xs);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

.nav-links a:hover {
    color: var(--primary);
}

.nav-links a:hover::after {
    width: 70%;
}

.header-actions {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

.btn {
    padding: 0.55rem 1.25rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.88rem;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    cursor: pointer;
    border: none;
    line-height: 1.5;
}

.btn-outline {
    border: 1.5px solid var(--gray-300);
    color: var(--gray-700);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-subtle);
    transform: translateY(-1px);
}

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

.btn-primary:hover {
    background: var(--gradient-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(79, 70, 229, 0.35);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: var(--gray-900);
    box-shadow: var(--shadow-accent);
}

.btn-accent:hover {
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(245, 158, 11, 0.4);
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    flex-direction: column;
    gap: 5px;
    z-index: 1001;
}

.mobile-toggle span {
    width: 24px;
    height: 2.5px;
    background: var(--gray-700);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.mobile-toggle.active span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 1.5rem;
    z-index: 10000;
    flex-direction: column;
    box-shadow: var(--shadow-md);
    transform: translateY(-10px);
    opacity: 0;
    transition: all var(--transition-base);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
}

.mobile-menu.open {
    display: flex !important;
    transform: translateY(0);
    opacity: 1;
}

.mobile-menu a {
    padding: 0.75rem 0.5rem;
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--radius-xs);
    transition: all var(--transition-fast);
    border-bottom: 1px solid var(--gray-50);
}

.mobile-menu a:last-child {
    border-bottom: none;
}

.mobile-menu a:hover {
    color: var(--primary);
    background: var(--primary-subtle);
    padding-left: 1rem;
}

/* ===== 4. Hero Section ===== */
.hero {
    position: relative;
    display: flex;
    align-items: center;
    padding: 6rem 0 4rem;
    text-align: center;
    background: var(--gradient-hero);
    color: white;
    overflow: hidden;
}

.hero-container {
    position: relative;
    z-index: 2;
}

.hero-bg-shape {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    animation: heroFloat 8s ease-in-out infinite;
}

.hero-bg-shape-1 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(129, 140, 248, 0.25) 0%, transparent 70%);
    top: -100px; right: -100px; animation-delay: 0s;
}
.hero-bg-shape-2 {
    width: 300px; height: 300px;
    background: radial-gradient(circle, rgba(129, 140, 248, 0.25) 0%, transparent 70%);
    bottom: -50px; left: -50px; animation-delay: 2s;
}
.hero-bg-shape-3 {
    width: 200px; height: 200px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.15) 0%, transparent 70%);
    top: 40%; left: 20%; animation-delay: 4s;
}

@keyframes heroFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(20px, -30px) scale(1.05); }
    50% { transform: translate(-15px, 20px) scale(0.95); }
    75% { transform: translate(10px, -15px) scale(1.02); }
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
}

.hero-tag-icon {
    font-size: 1rem;
    animation: heroIconPulse 2s ease-in-out infinite;
}

@keyframes heroIconPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.7; }
}

.hero h1 {
    font-size: var(--font-size-4xl);
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 1.25rem;
    color: white;
}

.hero h1 em {
    font-style: normal;
    background: linear-gradient(135deg, #f7f8fb, #fd9d06, #f6f9f5);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-left: 8px;
}

.hero p {
    font-size: 1rem;
    opacity: 0.85;
    margin: 3rem auto;
    line-height: 1.8;
    font-weight: 400;
    text-align: justify;
    text-indent: 2em;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3.5rem;
    flex-wrap: wrap;
}

.btn-lg {
    padding: 0.9rem 2.25rem;
    border-radius: var(--radius);
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: 0.3px;
}

.btn-lg-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: var(--gray-900);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.4);
}
.btn-lg-primary:hover {
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(245, 158, 11, 0.5);
}
.btn-lg-primary svg { transition: transform var(--transition-fast); }
.btn-lg-primary:hover svg { transform: translateX(4px); }

.btn-lg-outline {
    border: 1.5px solid rgba(255,255,255,0.5);
    color: white;
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
}
.btn-lg-outline:hover {
    border-color: white;
    background: rgba(255,255,255,0.12);
    transform: translateY(-3px);
}

.hero-metrics {
    display: flex;
    gap: 3rem;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
}

.hero-metric { text-align: center; min-width: 100px; }

.hero-metric .num {
    font-size: 2.2rem;
    font-weight: 900;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #ffffff, #c7d2fe);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-metric .label {
    font-size: 0.85rem;
    opacity: 0.75;
    margin-top: 0.3rem;
    font-weight: 500;
}
.hero-metric-divider {
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.2);
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    z-index: 2;
    animation: heroScrollPulse 2s ease-in-out infinite;
}
.hero-scroll-mouse {
    width: 26px; height: 42px;
    border: 2px solid rgba(255,255,255,0.6);
    border-radius: var(--radius-full);
    display: flex;
    justify-content: center;
    padding-top: 6px;
}
.hero-scroll-wheel {
    width: 4px; height: 8px;
    background: white;
    border-radius: var(--radius-full);
    animation: heroWheelScroll 1.5s ease-in-out infinite;
}
@keyframes heroWheelScroll {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(16px); opacity: 0; }
}
@keyframes heroScrollPulse {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}
.hero-scroll-indicator span {
    font-size: 0.75rem;
    opacity: 0.6;
    letter-spacing: 1px;
}

.hero-animate-item {
    opacity: 0;
    transform: translateY(30px);
    animation: heroFadeIn 0.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}
@keyframes heroFadeIn {
    to { opacity: 1; transform: translateY(0); }
}
.hero-with-bg {
    background-size: cover;
    background-position: center;
    background-blend-mode: overlay;
}

/* ===== 5. 通用区块 ===== */
.section {
    padding: 3rem 0;
    position: relative;
}
.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}
.section-label {
    display: inline-block;
    padding: 0.35rem 1.25rem;
    background: var(--primary-subtle);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 1rem;
}
.section-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.5px;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}
.section-divider {
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    margin: 0.75rem auto 1rem;
    border-radius: var(--radius-full);
}
.section-header .sub {
    color: var(--gray-500);
    font-size: var(--font-size-base);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ===== 6. 功能卡片 Features ===== */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}
.feat-card {
    background: var(--gray-0);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    position: relative;
}
.feat-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
    border-color: var(--primary-light);
}
.feat-img-wrapper { position: relative; overflow: hidden; }
.feat-img { width: 100%; height: 200px; object-fit: cover; transition: transform var(--transition-slow); }
.feat-card:hover .feat-img { transform: scale(1.08); }
.feat-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(to bottom, transparent 50%, rgba(17,24,39,0.5) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}
.feat-card:hover .feat-overlay { opacity: 1; }
.feat-number {
    position: absolute;
    top: 1rem; right: 1rem;
    font-size: 2.5rem;
    font-weight: 900;
    color: rgba(255,255,255,0.8);
    letter-spacing: -2px;
    z-index: 2;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}
.feat-body { padding: 1.5rem; }
.feat-body h3 {
    font-size: 1.1rem;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
    font-weight: 700;
    letter-spacing: -0.3px;
}
.feat-body p {
    color: var(--gray-500);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* ===== 6.5 优势价值 Advantages ===== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}
.advantage-card {
    background: var(--gray-0);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    position: relative;
}
.advantage-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
    border-color: var(--primary-light);
}
.advantage-img-wrapper { position: relative; overflow: hidden; }
.advantage-img { width: 100%; height: 180px; object-fit: cover; transition: transform var(--transition-slow); }
.advantage-card:hover .advantage-img { transform: scale(1.08); }
.advantage-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(to bottom, transparent 50%, rgba(17,24,39,0.5) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}
.advantage-card:hover .advantage-overlay { opacity: 1; }
.advantage-body { padding: 1.25rem; }
.advantage-body h3 {
    font-size: 1.05rem;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
    font-weight: 700;
    letter-spacing: -0.3px;
}
.advantage-body p {
    color: var(--gray-500);
    font-size: 0.88rem;
    line-height: 1.6;
}

/* ===== 7. AI模型 Models ===== */
.models-section {
    background: linear-gradient(180deg, var(--gray-50) 0%, var(--gray-0) 100%);
}
.models-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
}
.model-item {
    background: var(--gray-0);
    border-radius: var(--radius);
    padding: 1.75rem 1rem;
    text-align: center;
    border: 1px solid var(--gray-200);
    transition: all var(--transition-base);
    cursor: pointer;
}
.model-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
    border-color: var(--primary-light);
}
.model-logo {
    width: 52px; height: 52px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.75rem;
    background: linear-gradient(135deg, var(--primary-subtle), #e0e7ff);
    color: var(--primary);
    font-size: 1.25rem;
    transition: all var(--transition-base);
}
.model-item:hover .model-logo {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-primary);
    transform: scale(1.1);
}
.model-logo svg, .model-logo i { width: 28px; height: 28px; display: inline-block; }
.model-item strong { display: block; color: var(--gray-800); font-size: 0.9rem; font-weight: 700; margin-bottom: 0.25rem; }
.model-item span { color: var(--gray-400); font-size: 0.75rem; font-weight: 500; }

/* ===== 8. 媒体渠道 Channels ===== */
.channels-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1rem;
}
.channel-item {
    background: var(--gray-0);
    border-radius: var(--radius);
    padding: 1.75rem 1.25rem;
    text-align: center;
    border: 1px solid var(--gray-200);
    transition: all var(--transition-base);
    cursor: pointer;
}
.channel-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
    border-color: var(--primary-hover);
}
.channel-logo {
    width: 48px; height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.75rem;
    background: linear-gradient(135deg, #eff6ff, #e0e7ff);
    color: var(--primary-hover);
    font-size: 1.25rem;
    transition: all var(--transition-base);
}
.channel-item:hover .channel-logo {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 8px 25px rgba(79,70,229,0.3);
    transform: scale(1.1);
}
.channel-logo svg, .channel-logo i { width: 26px; height: 26px; display: inline-block; }
.channel-item strong { display: block; color: var(--gray-800); font-size: 0.95rem; font-weight: 700; margin-bottom: 0.25rem; }
.channel-item span { color: var(--gray-400); font-size: 0.78rem; line-height: 1.4; }

/* ===== 9. GEO效果 ===== */
.geo-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}
.geo-card {
    background: var(--gray-0);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
}
.geo-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
    border-color: var(--primary-light);
}
.geo-icon {
    width: 56px; height: 56px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-subtle), #e0e7ff);
    border-radius: var(--radius);
    color: var(--primary);
    font-size: 1.5rem;
    transition: all var(--transition-base);
}
.geo-card:hover .geo-icon {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-primary);
    transform: scale(1.1) rotate(-5deg);
}
.geo-icon svg, .geo-icon i { width: 28px; height: 28px; display: inline-block; }
.geo-card .num { font-size: 1.75rem; font-weight: 900; color: var(--primary); letter-spacing: -0.5px; margin-bottom: 0.25rem; }
.geo-card h3 { margin: 0.3rem 0; color: var(--gray-900); font-size: 1rem; font-weight: 700; }
.geo-card p { color: var(--gray-500); font-size: 0.85rem; line-height: 1.6; }

/* ===== 10. 数据条 Stats Strip ===== */
.stats-strip {
    background: var(--gradient-stats);
    color: white;
    padding: 3.5rem 0;
    position: relative;
    overflow: hidden;
}
.stats-strip::before {
    content: '';
    position: absolute;
    top: -50%; left: -10%;
    width: 300px; height: 300px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
}
.stats-strip::after {
    content: '';
    position: absolute;
    bottom: -50%; right: -10%;
    width: 400px; height: 400px;
    border-radius: 50%;
    background: rgba(255,255,255,0.03);
}
.stats-strip .inner {
    display: flex;
    justify-content: center;
    gap: 5rem;
    flex-wrap: wrap;
    align-items: center;
    position: relative;
    z-index: 2;
}
.stats-strip .stat { text-align: center; }
.stats-strip .val { font-size: 2.5rem; font-weight: 900; letter-spacing: -1px; }
.stats-strip .lbl { color: rgba(255,255,255,0.8); font-size: 0.9rem; font-weight: 500; margin-top: 0.3rem; }
.stat-divider { width: 1px; height: 50px; background: rgba(255,255,255,0.25); }

/* ===== 11. 流程 Flow ===== */
.flow-section { background: linear-gradient(180deg, var(--gray-0) 0%, var(--gray-50) 100%); }
.flow-steps {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 1.5rem;
    flex-wrap: wrap;
}
.flow-card {
    background: var(--gray-0);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    width: 300px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    position: relative;
    border: 1px solid var(--gray-200);
    transition: all var(--transition-base);
}
.flow-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
    border-color: var(--primary-light);
}
.flow-num {
    position: absolute;
    top: 1rem; right: 1.25rem;
    font-size: 3rem;
    font-weight: 900;
    color: var(--gray-100);
    line-height: 1;
    letter-spacing: -2px;
    transition: color var(--transition-base);
}
.flow-card:hover .flow-num { color: var(--primary-subtle); }
.flow-icon {
    width: 60px; height: 60px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-subtle), #e0e7ff);
    border-radius: var(--radius);
    color: var(--primary);
    transition: all var(--transition-base);
}
.flow-card:hover .flow-icon {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-primary);
    transform: scale(1.1);
}
.flow-icon svg { width: 28px; height: 28px; }
.flow-card h3 { color: var(--gray-900); margin: 0.75rem 0 0.5rem; font-size: 1.1rem; font-weight: 700; }
.flow-card p { color: var(--gray-500); font-size: 0.9rem; line-height: 1.7; }
.flow-arrow {
    font-size: 2rem;
    color: var(--primary);
    display: flex;
    align-items: center;
    padding: 0 0.5rem;
    margin-top: 5.5rem;
    animation: flowArrowPulse 2s ease-in-out infinite;
}
.flow-arrow svg { width: 28px; height: 28px; }
@keyframes flowArrowPulse {
    0%, 100% { opacity: 0.5; transform: translateX(0); }
    50% { opacity: 1; transform: translateX(6px); }
}

/* ===== 12. 套餐 Pricing ===== */
.pricing-section { background: var(--gray-50); padding: 6rem 0; }
.pricing-section .container { max-width: var(--max); }
.pricing-section .section-header { text-align: center; margin-bottom: 3.5rem; }
.pricing-section .section-label {
    display: inline-block;
    padding: 0.35rem 1.25rem;
    background: var(--primary-subtle);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 1rem;
}
.pricing-section .section-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
    letter-spacing: -0.5px;
}
.pricing-section .section-header .sub {
    color: var(--gray-500);
    font-size: var(--font-size-base);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* 套餐网格 */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    align-items: stretch;
}

/* 套餐卡片 */
.pricing-card {
    background: var(--gray-0);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--gray-200);
    position: relative;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}
.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}
.pricing-card-featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-primary);
    position: relative;
    overflow: visible;
}
.pricing-card-featured::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: calc(var(--radius-lg) + 3px);
    background: var(--gradient-primary);
    z-index: -1;
    opacity: 0.15;
    filter: blur(10px);
}
.pricing-card-featured:hover {
    border-color: var(--primary);
    box-shadow: 0 20px 50px rgba(79,70,229,0.3);
}
.pricing-badge {
    position: absolute;
    top: -13px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: white;
    padding: 0.3rem 1.25rem;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 700;
    white-space: nowrap;
    letter-spacing: 1px;
    text-transform: uppercase;
    box-shadow: var(--shadow-primary);
}
.pricing-name {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--gray-900);
    text-align: center;
    margin-top: 0.25rem;
    margin-bottom: 0.25rem;
    letter-spacing: -0.3px;
}
.pricing-desc {
    color: var(--gray-500);
    font-size: 0.85rem;
    text-align: center;
    margin-bottom: 1.25rem;
    min-height: 2.4rem;
    line-height: 1.5;
}
.pricing-amount {
    text-align: center;
    margin-bottom: 1.25rem;
    padding: 0.75rem 0;
    border-top: 1px solid var(--gray-100);
    border-bottom: 1px solid var(--gray-100);
}
.amount-free {
    font-size: 2.25rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--success), var(--primary-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.amount-price {
    font-size: 2.25rem;
    font-weight: 900;
    color: var(--gray-900);
    letter-spacing: -0.5px;
}
.amount-period {
    font-size: 0.85rem;
    color: var(--gray-400);
    font-weight: 500;
}
.pricing-features {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem;
    flex: 1;
}
.pricing-features li {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    padding: 0.45rem 0;
    font-size: 0.88rem;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-50);
    line-height: 1.5;
}
.pricing-features li:last-child { border-bottom: none; }
.pricing-check-icon {
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--success);
    stroke: var(--success);
}
.pricing-action {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0.8rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.9rem;
    text-decoration: none;
    transition: all var(--transition-fast);
    letter-spacing: 0.3px;
}
.pricing-action-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-primary);
}
.pricing-action-primary:hover {
    background: var(--gradient-primary-hover);
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(79,70,229,0.4);
}
.pricing-action-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}
.pricing-action-secondary:hover {
    background: var(--gray-200);
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}
.pricing-footnote {
    text-align: center;
    font-size: 0.7rem;
    color: var(--gray-400);
    margin-top: 0.75rem;
    line-height: 1.5;
}

/* 对比链接 */
.pricing-compare-link {
    text-align: center;
    margin-top: 2.5rem;
}
.compare-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
    font-size: 0.95rem;
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}
.compare-link-btn:hover {
    background: var(--primary-subtle);
    transform: translateY(-2px);
}
.compare-link-btn svg { transition: transform var(--transition-fast); }
.compare-link-btn:hover svg { transform: translateY(4px); }

/* ===== 对比表格（新 Grid 布局） ===== */
.pricing-comparison {
    margin-top: 4rem;
    scroll-margin-top: 100px;
}
.pricing-comparison h3 {
    text-align: center;
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 2rem;
    letter-spacing: -0.3px;
}

/* 桌面端 Grid 布局 */
.comparison-grid {
    display: grid;
    grid-template-columns: 200px repeat(var(--pkg-count), 1fr);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    font-size: 0.85rem;
    box-shadow: var(--shadow-md);
    background: white;
}
.comparison-header,
.comparison-row {
    display: contents; /* 子项直接参与 grid */
}
.comparison-header > div,
.comparison-row > div {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}
.comparison-header > div {
    background: var(--gray-50);
    font-weight: 700;
    color: var(--gray-700);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--gray-200);
    white-space: nowrap;
}
.comparison-feature-header {
    justify-content: flex-start !important;
    text-align: left !important;
    position: sticky;
    left: 0;
    z-index: 2;
    background: var(--gray-0) !important;
}
.comparison-row > .comparison-feature-cell {
    justify-content: flex-start !important;
    text-align: left;
    background: var(--gray-0);
    position: sticky;
    left: 0;
    z-index: 1;
    box-shadow: 2px 0 5px rgba(0,0,0,0.05);
    min-width: 200px; /* 确保首列宽度 */
}
.comparison-row:nth-child(even) > .comparison-value-cell {
    background-color: var(--gray-50);
}
.comparison-row:hover > .comparison-value-cell {
    background-color: var(--primary-subtle);
    transition: background-color var(--transition-fast);
}
.comparison-row:last-child > div {
    border-bottom: none;
}
.comparison-feature-cell strong {
    color: var(--gray-800);
    font-weight: 700;
    display: block;
}
.comparison-feature-cell .text-muted {
    color: var(--gray-400);
    font-size: 0.78rem;
}
.comparison-value-cell {
    /* 普通单元格样式 */
}
.comparison-check {
    color: var(--success);
    stroke: var(--success);
}
.comparison-cross {
    color: var(--gray-300);
    font-size: 1.2rem;
}
.comparison-unlimited {
    font-weight: 700;
    color: var(--primary);
    background: var(--primary-subtle);
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    display: inline-block;
}
.comparison-number {
    font-weight: 700;
    color: var(--gray-800);
}
.no-packages {
    text-align: center;
    color: var(--gray-400);
    font-size: 1rem;
    padding: 3rem 0;
}

/* 移动端：横向滚动表格 */
@media (max-width: 768px) {
    .pricing-comparison {
        margin-top: 2.5rem;
        scroll-margin-top: 80px;
    }
    .pricing-comparison h3 {
        font-size: 1.2rem;
        margin-bottom: 1.5rem;
    }

    /* 滚动容器 */
    .comparison-grid {
        display: grid !important;
        grid-template-columns: 150px repeat(var(--pkg-count), 60px) !important;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        border: 1px solid var(--gray-200);
        border-radius: var(--radius);
        box-shadow: var(--shadow-sm);
        font-size: 0.78rem;
        white-space: nowrap;
        position: relative;
        background: white;
    }

    /* 表头和行 */
    .comparison-header,
    .comparison-row {
        display: contents !important;
    }

    /* 表头单元格 */
    .comparison-header > div {
        background: var(--gray-50);
        font-weight: 700;
        color: var(--gray-700);
        text-transform: uppercase;
        letter-spacing: 0.5px;
        border-bottom: 2px solid var(--gray-200);
        padding: 0.6rem 0.4rem;
        text-align: center;
        white-space: nowrap;
        font-size: 0.75rem;
    }

    /* 普通单元格 */
    .comparison-row > div {
        padding: 0.5rem 0.4rem;
        border-bottom: 1px solid var(--gray-100);
        text-align: center;
        white-space: normal;
        word-break: break-word;
        font-size: 0.78rem;
    }

    /* 首列固定：功能名称 */
    .comparison-feature-header,
    .comparison-row > .comparison-feature-cell {
        position: sticky;
        left: 0;
        z-index: 2;
        background: white !important;
        box-shadow: 2px 0 5px rgba(0,0,0,0.05);
        text-align: left !important;
        justify-content: flex-start;
        display: flex;
        align-items: center;
        min-width: 150px;           /* 首列宽度150px */
        padding-left: 0.5rem;
    }

    /* 功能名称文本 */
    .comparison-feature-cell strong {
        display: block;
        white-space: normal;
        line-height: 1.3;
        font-size: 0.75rem;
    }
    .comparison-feature-cell .text-muted {
        display: none;   /* 已删除描述，如不需要可忽略 */
    }

    /* 隐藏卡片式布局的伪元素 */
    .comparison-value-cell::before {
        display: none !important;
    }

    /* 滚动提示 */
    .comparison-grid::after {
        content: '';
        position: sticky;
        right: 0;
        width: 20px;
        height: 100%;
        background: linear-gradient(to left, rgba(255,255,255,0.9), transparent);
        pointer-events: none;
        flex-shrink: 0;
    }

    .comparison-scroll-hint {
        display: block;
        text-align: center;
        font-size: 0.75rem;
        color: var(--gray-500);
        margin-top: 0.5rem;
    }
}

/* ===== 13. CTA ===== */
.cta {
    background: var(--gradient-cta);
    color: white;
    padding: 5rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.cta-bg-shape { position: absolute; border-radius: 50%; pointer-events: none; animation: heroFloat 10s ease-in-out infinite; }
.cta-bg-shape-1 { width: 350px; height: 350px; background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%); top: -100px; left: 10%; }
.cta-bg-shape-2 { width: 250px; height: 250px; background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 70%); bottom: -50px; right: 10%; animation-delay: 3s; }
.cta .container { position: relative; z-index: 2; }
.cta h2 { font-size: var(--font-size-2xl); font-weight: 900; margin-bottom: 0.75rem; letter-spacing: -0.5px; }
.cta p { opacity: 0.85; margin-bottom: 2.5rem; font-size: 1.05rem; max-width: 600px; margin-left: auto; margin-right: auto; }
.cta-btns { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn-cta {
    padding: 0.9rem 2.25rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: var(--gray-900);
    border-radius: var(--radius);
    font-weight: 700;
    text-decoration: none;
    font-size: 1rem;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-accent);
}
.btn-cta:hover { background: linear-gradient(135deg, var(--accent-light), var(--accent)); transform: translateY(-3px); box-shadow: 0 12px 35px rgba(245,158,11,0.5); }
.btn-cta svg { transition: transform var(--transition-fast); }
.btn-cta:hover svg { transform: translateX(4px); }
.btn-cta-outline {
    padding: 0.9rem 2.25rem;
    border: 2px solid rgba(255,255,255,0.5);
    color: white;
    border-radius: var(--radius);
    font-weight: 700;
    text-decoration: none;
    font-size: 1rem;
    transition: all var(--transition-base);
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
}
.btn-cta-outline:hover { border-color: white; background: rgba(255,255,255,0.12); transform: translateY(-3px); }
.cta-with-bg { background-size: cover; background-position: center; background-blend-mode: overlay; }

/* ===== 14. Footer ===== */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: 3.5rem 0 1.5rem;
}
.footer-grid {
    display: grid;
    grid-template-columns: 5fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2.5rem;
}
.footer-links-row {
    grid-column: 2 / -1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-left: 5rem;
}
.footer h4 { color: white; margin-bottom: 1rem; font-size: 0.95rem; font-weight: 700; letter-spacing: 0.3px; }
.footer p { font-size: 0.88rem; color: var(--gray-400); line-height: 1.7; }
.footer-col p { text-align: justify; text-indent: 2em; }
.footer a { font-size: 0.88rem; color: var(--gray-400); text-decoration: none; display: block; padding: 0.2rem 0; transition: all var(--transition-fast); }
.footer a:hover { color: white; padding-left: 0.5rem; }
.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: 1.5rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--gray-500);
}
.footer-bottom a { display: inline; padding: 0; font-size: 0.8rem; color: var(--gray-500); }
.footer-bottom a:hover { color: white; padding-left: 0; }
.footer-links a { display: inline !important; padding: 0 !important; font-size: 0.8rem !important; color: var(--gray-500) !important; }
.footer-links a:hover { color: white !important; padding-left: 0 !important; }

/* ===== 15. 平板响应式 ===== */
@media (max-width: 1024px) {
    :root { --font-size-4xl: 2.5rem; --font-size-3xl: 2rem; --font-size-2xl: 1.75rem; }
    .features { grid-template-columns: repeat(2, 1fr); }
    .models-grid { grid-template-columns: repeat(4, 1fr); }
    .channels-grid { grid-template-columns: repeat(3, 1fr); }
    .geo-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
    .pricing-card { padding: 1.75rem 1.25rem; }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
    .footer-grid>.footer-col:last-child { grid-column: span 2; }
    .flow-arrow { margin-top: 4rem; }
}

/* ===== 16. 手机响应式 ===== */
@media (max-width: 768px) {
    :root { --header-height: 60px; --font-size-4xl: 2rem; --font-size-3xl: 1.75rem; --font-size-2xl: 1.5rem; --font-size-xl: 1.25rem; }
    .container { padding: 0 1rem; }
    .header-inner { height: var(--header-height); }
    .nav-links, .header-actions { display: none; }
    .mobile-toggle { display: flex; }
    .logo { font-size: 1.1rem; }
    .logo img { height: 32px; }
    .logo-mark { width: 32px; height: 32px; font-size: 1.2rem; }
    .mobile-menu { top: var(--header-height); padding: 1rem; }
    .hero { min-height: auto; padding: 4rem 0 3rem; }
    .hero-tag { font-size: 0.8rem; padding: 0.5rem 1rem; gap: 0.3rem; }
    .hero h1 { font-size: 1.8rem; letter-spacing: -0.5px; line-height: 1.3; margin-bottom: 1rem; }
    .hero h1 em { font-style: normal; background: linear-gradient(135deg, #f7f8fb, #fd9d06, #f6f9f5); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-left: 8px; }
    .hero p { font-size: 0.9rem; line-height: 1.7; margin-bottom: 1.5rem; padding: 10px; }
    .hero-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 0.6rem; margin-bottom: 2.5rem; }
    .btn-lg { padding: 0.75rem 1.25rem; font-size: 0.85rem; justify-content: center; }
    .hero-metrics { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
    .hero-metric .num { font-size: 1.6rem; }
    .hero-metric-divider { display: none; }
    .hero-scroll-indicator { bottom: 0.75rem; }
    .hero-scroll-mouse { width: 22px; height: 34px; border-width: 1.5px; }
    .hero-scroll-wheel { width: 3px; height: 6px; }
    .section { padding: 3rem 0; }
    .section-header { margin-bottom: 2rem; }
    .section-header h2 { font-size: 1.4rem; }
    .section-label { font-size: 0.7rem; padding: 0.3rem 1rem; }
    .section-divider { width: 40px; height: 3px; }
    .section-header .sub { font-size: 0.88rem; }
    .features { grid-template-columns: 1fr; gap: 1rem; }
    .feat-img { height: 200px; }
    .feat-body { padding: 1.25rem; }
    .feat-number { font-size: 2rem; top: 0.75rem; right: 0.75rem; }
    .advantages-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
    .advantage-img { height: 140px; }
    .advantage-body { padding: 1rem; }
    .advantage-body h3 { font-size: 0.95rem; }
    .advantage-body p { font-size: 0.8rem; }
    .models-grid { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
    .model-item { padding: 1.25rem 0.5rem; }
    .model-logo { width: 44px; height: 44px; margin-bottom: 0.5rem; }
    .model-logo svg, .model-logo i { width: 24px; height: 24px; }
    .model-item strong { font-size: 0.8rem; }
    .model-item span { font-size: 0.7rem; }
    .channels-grid { grid-template-columns: repeat(4, 1fr); gap: 0.5rem; }
    .channel-item { padding: 1rem 0.5rem; }
    .channel-logo { width: 38px; height: 38px; margin-bottom: 0.5rem; }
    .channel-logo svg, .channel-logo i { width: 20px; height: 20px; }
    .channel-item strong { font-size: 0.78rem; }
    .channel-item span { font-size: 0.7rem; }
    .geo-grid { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
    .geo-card { padding: 1.5rem 1rem; }
    .geo-icon { width: 44px; height: 44px; margin-bottom: 0.75rem; }
    .geo-icon svg, .geo-icon i { width: 22px; height: 22px; }
    .geo-card .num { font-size: 1.4rem; }
    .geo-card h3 { font-size: 0.9rem; }
    .geo-card p { font-size: 0.78rem; }
    .stats-strip { padding: 2.5rem 0; }
    .stats-strip .inner { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
    .stats-strip .val { font-size: 1.8rem; }
    .stats-strip .lbl { font-size: 0.8rem; }
    .stat-divider { display: none; }
    .flow-steps { flex-direction: column; align-items: center; gap: 0.75rem; }
    .flow-arrow { transform: rotate(90deg); margin: 0; animation: flowArrowDownPulse 2s ease-in-out infinite; }
    @keyframes flowArrowDownPulse { 0%,100% { opacity:0.5; transform: rotate(90deg) translateX(0); } 50% { opacity:1; transform: rotate(90deg) translateX(6px); } }
    .flow-card { width: 100%; max-width: 320px; padding: 2rem 1.5rem; }
    .flow-num { font-size: 2.5rem; top: 0.75rem; right: 1rem; }
    .flow-icon { width: 48px; height: 48px; margin-bottom: 0.75rem; }
    .flow-icon svg { width: 24px; height: 24px; }
    .pricing-section { padding: 3rem 0; }
    .pricing-section .section-header h2 { font-size: 1.4rem; }
    .pricing-section .section-header .sub { font-size: 0.85rem; }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
    .pricing-card { padding: 1.25rem 0.75rem; border-radius: var(--radius); }
    .pricing-name { font-size: 1rem; }
    .pricing-desc { font-size: 0.75rem; min-height: 2rem; margin-bottom: 0.75rem; }
    .amount-free, .amount-price { font-size: 1.5rem; }
    .amount-period { font-size: 0.7rem; }
    .pricing-features li { font-size: 0.75rem; padding: 0.3rem 0; gap: 0.4rem; }
    .pricing-features li svg { width: 14px; height: 14px; }
    .pricing-action { font-size: 0.8rem; padding: 0.55rem 0.5rem; }
    .pricing-badge { font-size: 0.6rem; padding: 0.2rem 0.8rem; top: -10px; letter-spacing: 0.5px; }
    .pricing-footnote { font-size: 0.65rem; }
    .pricing-compare-link { margin-top: 1.5rem; }
    .compare-link-btn { font-size: 0.85rem; padding: 0.5rem 1rem; }
    .pricing-comparison { margin-top: 2.5rem; scroll-margin-top: 80px; }
    .pricing-comparison h3 { font-size: 1.2rem; margin-bottom: 1.5rem; }
    .pricing-comparison table { font-size: 0.75rem; min-width: 600px; } /* 移动端保持横向滚动 */
    .pricing-comparison th, .pricing-comparison td { padding: 0.5rem 0.6rem; }
    .pricing-comparison th { font-size: 0.7rem; }
    .pricing-comparison th:first-child, .pricing-comparison td:first-child { min-width: 140px; }
    .cta { padding: 3rem 0; }
    .cta h2 { font-size: 1.5rem; }
    .cta p { font-size: 0.9rem; margin-bottom: 1.5rem; }
    .cta-btns { flex-direction: column; gap: 0.75rem; align-items: center; }
    .btn-cta, .btn-cta-outline { width: 100%; max-width: 320px; justify-content: center; padding: 0.8rem 1.5rem; font-size: 0.9rem; }
    .footer { padding: 2.5rem 0 1rem; }
    .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; margin-bottom: 1.5rem; }
    .footer-grid>.footer-col:first-child { grid-column: 1 / -1; }
    .footer-grid>.footer-col:last-child { grid-column: auto; }
    .footer-col p { padding: 10px; }
    .footer-links-row { grid-column: 1 / -1; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; margin-left: 2rem; }
    .footer h4 { font-size: 0.9rem; margin-bottom: 0.6rem; }
    .footer p, .footer a { font-size: 0.82rem; }
    .footer-bottom { font-size: 0.78rem; }
}

/* ===== 17. 超小屏 ===== */
@media (max-width: 480px) {
    .hero-buttons { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
    .channels-grid { grid-template-columns: repeat(3, 1fr); }
    .models-grid { grid-template-columns: repeat(2, 1fr); }
    .geo-grid { grid-template-columns: repeat(2, 1fr); }
    .advantages-grid { gap: 0.75rem; }
    .advantage-img { height: 150px; }
}

/* ===== 18. 打印样式 ===== */
@media print {
    .hero-bg-shape, .hero-scroll-indicator, .cta-bg-shape, .flow-arrow { display: none; }
}