/* ============================================
   数字哥落地页样式
   Design System & CSS Variables
   ============================================ */

:root {
    /* 品牌色 */
    --color-primary: #3B82F6;
    --color-primary-dark: #1D4ED8;
    --color-primary-light: #60A5FA;
    --color-secondary: #10B981;
    --color-accent: #8B5CF6;

    /* 中性色 */
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;

    /* 功能色 */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;

    /* 间距 */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* 圆角 */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);

    /* 字体 */
    --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;

    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ============================================
   全局重置 & 基础样式
   ============================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   通用组件
   ============================================ */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    box-shadow: 0 4px 14px 0 rgb(59 130 246 / 0.39);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px 0 rgb(59 130 246 / 0.23);
}

.btn-secondary {
    background-color: var(--color-gray-100);
    color: var(--color-gray-700);
    border-color: var(--color-gray-200);
}

.btn-secondary:hover {
    background-color: var(--color-gray-200);
    border-color: var(--color-gray-300);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

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

.btn-large {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
}

.btn-icon {
    width: 1.125em;
    height: 1.125em;
}

.section-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-primary);
    background-color: rgb(59 130 246 / 0.1);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--space-md);
    letter-spacing: -0.025em;
}

.section-desc {
    font-size: 1.0625rem;
    color: var(--color-gray-500);
    max-width: 600px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ============================================
   导航栏
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-gray-100);
    transition: background-color var(--transition-base);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo svg {
    width: 36px;
    height: 36px;
}

.brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-gray-900);
}

.tagline {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
    display: none;
}

@media (min-width: 768px) {
    .tagline {
        display: block;
    }
}

.nav-menu {
    display: none;
}

.nav-link {
    padding: var(--space-sm) var(--space-md);
    font-weight: 500;
    color: var(--color-gray-600);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: color var(--transition-fast);
}

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

@media (min-width: 768px) {
    .nav-menu {
        display: flex;
        align-items: center;
        gap: var(--space-xs);
    }
}

.mobile-menu-btn {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background-color: var(--color-gray-700);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

@media (min-width: 768px) {
    .mobile-menu-btn {
        display: none;
    }
}

/* ============================================
   Hero 区域
   ============================================ */

.hero {
    padding-top: 120px;
    padding-bottom: var(--space-3xl);
    background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-white) 100%);
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

@media (min-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr 1fr;
    }
}

.hero-content {
    text-align: center;
}

@media (min-width: 992px) {
    .hero-content {
        text-align: left;
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-bottom: var(--space-lg);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background-color: var(--color-success);
    border-radius: var(--radius-full);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 800;
    line-height: 1.1;
    color: var(--color-gray-900);
    margin-bottom: var(--space-lg);
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1.0625rem;
    color: var(--color-gray-500);
    margin-bottom: var(--space-xl);
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 992px) {
    .hero-subtitle {
        margin-left: 0;
    }
}

.desktop-only {
    display: none;
}

@media (min-width: 768px) {
    .desktop-only {
        display: inline;
    }
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

@media (min-width: 480px) {
    .hero-actions {
        flex-direction: row;
        justify-content: center;
    }
}

@media (min-width: 992px) {
    .hero-actions {
        justify-content: flex-start;
    }
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    justify-content: center;
}

@media (min-width: 992px) {
    .hero-meta {
        justify-content: flex-start;
    }
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

.meta-item svg {
    width: 18px;
    height: 18px;
    color: var(--color-success);
}

/* Hero Visual */
.hero-visual {
    position: relative;
}

.app-preview {
    position: relative;
    z-index: 1;
}

.app-window {
    background-color: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--color-gray-200);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
    transition: transform var(--transition-slow);
}

.app-window:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.window-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background-color: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
}

.window-controls {
    display: flex;
    gap: var(--space-sm);
}

.control {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
}

.control-close { background-color: #FF5F57; }
.control-minimize { background-color: #FFBD2E; }
.control-maximize { background-color: #28CA42; }

.window-title {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-gray-600);
}

.window-body {
    display: grid;
    grid-template-columns: 200px 1fr;
    min-height: 320px;
}

.sidebar {
    padding: var(--space-md);
    background-color: var(--color-gray-50);
    border-right: 1px solid var(--color-gray-200);
}

.sidebar-section {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-bottom: var(--space-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sidebar-section:hover {
    background-color: var(--color-gray-200);
}

.sidebar-section.active {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.section-icon {
    font-size: 1.125rem;
}

.main-content {
    padding: var(--space-lg);
    background-color: var(--color-white);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.metric-card {
    padding: var(--space-md);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    text-align: center;
}

.metric-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-gray-900);
}

.metric-label {
    font-size: 0.75rem;
    color: var(--color-gray-500);
    margin-top: var(--space-xs);
}

.metric-trend {
    font-size: 0.75rem;
    color: var(--color-success);
    margin-top: var(--space-xs);
}

.content-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.content-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.content-item:hover {
    background-color: var(--color-gray-50);
}

.item-thumb {
    font-size: 1.5rem;
}

.item-info {
    flex: 1;
    min-width: 0;
}

.item-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-900);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.item-meta {
    font-size: 0.75rem;
    color: var(--color-gray-500);
}

.item-stats {
    display: flex;
    gap: var(--space-sm);
    font-size: 0.75rem;
    color: var(--color-gray-500);
}

/* ============================================
   核心价值
   ============================================ */

.value-props {
    padding: var(--space-3xl) 0;
    background-color: var(--color-white);
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.value-card {
    padding: var(--space-xl);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    position: relative;
}

.value-card.featured {
    background: linear-gradient(135deg, rgb(59 130 246 / 0.05) 0%, rgb(139 92 246 / 0.05) 100%);
    border: 2px solid var(--color-primary);
    box-shadow: var(--shadow-md);
}

.featured-badge {
    position: absolute;
    top: -10px;
    right: var(--space-md);
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: var(--color-white);
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.value-card:hover {
    background-color: var(--color-white);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.value-card.featured:hover {
    background: linear-gradient(135deg, rgb(59 130 246 / 0.1) 0%, rgb(139 92 246 / 0.1) 100%);
    border-color: var(--color-accent);
}

.value-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: var(--color-white);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
}

.value-icon svg {
    width: 24px;
    height: 24px;
}

.value-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--space-sm);
}

.value-card p {
    font-size: 0.9375rem;
    color: var(--color-gray-500);
    line-height: 1.7;
}

/* ============================================
   功能特性
   ============================================ */

.features {
    padding: var(--space-4xl) 0;
    background-color: var(--color-gray-50);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

@media (min-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    /* 两个featured卡片都占满整行 */
    .feature-card.featured {
        grid-column: 1 / -1;
    }
    /* AI内容创作助手（第二个卡片）图片放左边 */
    .feature-card:first-child + .feature-card.featured .feature-image {
        order: -1;
    }
}

.feature-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    background-color: var(--color-white);
    border-radius: var(--radius-2xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.feature-card:hover {
    box-shadow: var(--shadow-md);
}

.feature-card.featured {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

@media (min-width: 768px) {
    .feature-card.featured {
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }
}

.feature-image {
    aspect-ratio: 16 / 10;
    background: linear-gradient(135deg, var(--color-gray-100) 0%, var(--color-gray-200) 100%);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.image-placeholder {
    font-size: 4rem;
    position: relative;
}

.floating-icon {
    position: absolute;
    font-size: 2rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.feature-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
}

.feature-content h3 {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--space-md);
}

.feature-content > p {
    color: var(--color-gray-500);
    margin-bottom: var(--space-lg);
}

.feature-list {
    list-style: none;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    font-size: 0.9375rem;
    color: var(--color-gray-600);
}

.feature-list li span {
    color: var(--color-success);
    font-weight: 700;
    flex-shrink: 0;
}

.feature-list li svg {
    width: 18px;
    height: 18px;
    color: var(--color-success);
}

/* ============================================
   平台支持
   ============================================ */

.platforms {
    padding: var(--space-4xl) 0;
    background-color: var(--color-white);
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--space-lg);
}

.platform-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-xl);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.platform-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.platform-card.supported {
    background-color: rgb(16 185 129 / 0.05);
    border-color: var(--color-success);
}

.platform-card.coming-soon {
    opacity: 0.7;
}

.platform-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
}

.platform-icon svg {
    width: 100%;
    height: 100%;
}

.xiaohongshu { background-color: #FFF0F2; }
.wechat { background-color: #F0F9FF; }
.douyin { background-color: #F5F5F5; }
.bilibili { background-color: #E0F2FE; }
.zhihu { background-color: #EFF6FF; }
.weibo { background-color: #FEF2F2; }
.kuaishou { background-color: #FFF7ED; }

.platform-name {
    font-weight: 600;
    color: var(--color-gray-900);
}

.platform-status {
    font-size: 0.75rem;
    color: var(--color-gray-500);
}

.platform-card.supported .platform-status {
    color: var(--color-success);
    font-weight: 500;
}

/* ============================================
   使用场景
   ============================================ */

.scenarios {
    padding: var(--space-4xl) 0;
    background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-white) 100%);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
}

.scenario-card {
    padding: var(--space-xl);
    background-color: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.scenario-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.scenario-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-gray-100);
    color: var(--color-primary);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-lg);
}

.scenario-icon svg {
    width: 28px;
    height: 28px;
}

.scenario-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--space-sm);
}

.scenario-card > p {
    color: var(--color-gray-500);
    font-size: 0.9375rem;
    margin-bottom: var(--space-lg);
}

.scenario-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tag {
    padding: var(--space-xs) var(--space-sm);
    background-color: var(--color-gray-100);
    font-size: 0.75rem;
    color: var(--color-gray-600);
    border-radius: var(--radius-md);
}

/* ============================================
   数据展示
   ============================================ */

.stats {
    padding: var(--space-3xl) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

@media (min-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.stat-label {
    font-size: 0.9375rem;
    opacity: 0.9;
}

/* ============================================
   定价
   ============================================ */

.pricing {
    padding: var(--space-4xl) 0;
    background-color: var(--color-gray-50);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
    align-items: stretch;
}

.pricing-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background-color: var(--color-white);
    border-radius: var(--radius-2xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.pricing-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.pricing-card.featured {
    border: 2px solid var(--color-primary);
    box-shadow: var(--shadow-md);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    right: var(--space-xl);
    padding: var(--space-xs) var(--space-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.pricing-header {
    text-align: center;
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-gray-200);
}

.pricing-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--space-md);
}

.pricing {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
}

.currency {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-600);
}

.amount {
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-gray-900);
}

.period {
    font-size: 0.9375rem;
    color: var(--color-gray-500);
}

.pricing-desc {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

.pricing-features {
    list-style: none;
    flex: 1;
    margin-bottom: var(--space-xl);
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    font-size: 0.9375rem;
    color: var(--color-gray-600);
}

.pricing-features li svg {
    width: 18px;
    height: 18px;
    color: var(--color-success);
    flex-shrink: 0;
}

.pricing-card .btn {
    width: 100%;
}

/* ============================================
   下载区域
   ============================================ */

.download {
    padding: var(--space-4xl) 0;
    background-color: var(--color-white);
}

.download-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

@media (min-width: 992px) {
    .download-content {
        grid-template-columns: 1fr 1fr;
    }
}

.download-info h2 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--space-md);
}

.download-info > p {
    font-size: 1.0625rem;
    color: var(--color-gray-500);
    margin-bottom: var(--space-xl);
}

.download-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.download-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: all var(--transition-base);
}

.download-item:hover {
    background-color: var(--color-gray-100);
    transform: translateX(4px);
}

.download-item .platform-icon {
    width: 48px;
    height: 48px;
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.download-item .platform-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-gray-700);
}

.platform-info {
    flex: 1;
}

.platform-name {
    font-weight: 600;
    color: var(--color-gray-900);
}

.platform-size {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
}

.download-arrow {
    width: 20px;
    height: 20px;
    color: var(--color-gray-400);
}

.download-visual {
    position: relative;
    min-height: 300px;
}

.floating-card {
    position: absolute;
    padding: var(--space-lg);
    background-color: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    animation: floatCard 4s ease-in-out infinite;
    animation-delay: var(--delay, 0s);
    max-width: 180px;
}

.floating-card:nth-child(1) {
    top: 0;
    left: 10%;
}

.floating-card:nth-child(2) {
    top: 35%;
    right: 5%;
}

.floating-card:nth-child(3) {
    bottom: 0;
    left: 30%;
}

@keyframes floatCard {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-15px);
    }
}

.card-icon {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

.card-title {
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--space-xs);
}

.card-desc {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

/* ============================================
   CTA区域
   ============================================ */

.cta {
    padding: var(--space-4xl) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    text-align: center;
    color: var(--color-white);
}

.cta-content h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.cta-content > p {
    font-size: 1.0625rem;
    opacity: 0.9;
    max-width: 540px;
    margin: 0 auto var(--space-xl);
}

.cta-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    justify-content: center;
}

@media (min-width: 480px) {
    .cta-actions {
        flex-direction: row;
    }
}

.cta .btn-secondary {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    color: var(--color-white);
}

.cta .btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

/* ============================================
   页脚
   ============================================ */

.footer {
    padding: var(--space-3xl) 0 var(--space-lg);
    background-color: var(--color-gray-900);
    color: var(--color-gray-400);
}

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

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: 1.5fr 2fr;
    }
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.footer-brand .logo svg {
    opacity: 0.9;
}

.footer-brand .brand-text {
    color: var(--color-white);
}

.footer-tagline {
    font-size: 0.9375rem;
}

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

@media (min-width: 640px) {
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

.link-group h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--space-md);
}

.link-group a {
    display: block;
    font-size: 0.875rem;
    color: var(--color-gray-400);
    text-decoration: none;
    margin-bottom: var(--space-sm);
    transition: color var(--transition-fast);
}

.link-group a:hover {
    color: var(--color-white);
}

.footer-bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-gray-800);
    text-align: center;
    font-size: 0.875rem;
}

/* ============================================
   响应式设计
   ============================================ */

@media (max-width: 767px) {
    .hero {
        padding-top: 100px;
        padding-bottom: var(--space-2xl);
    }

    .value-props,
    .features,
    .platforms,
    .scenarios,
    .pricing,
    .download {
        padding: var(--space-2xl) 0;
    }

    .stats {
        padding: var(--space-xl) 0;
    }

    .window-body {
        grid-template-columns: 60px 1fr;
    }

    .sidebar-section {
        flex-direction: column;
        gap: 0;
        padding: var(--space-sm);
    }

    .section-icon {
        font-size: 1rem;
    }

    .sidebar-section span:not(.section-icon) {
        display: none;
    }

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

    .metric-value {
        font-size: 1rem;
    }

    .content-item {
        padding: var(--space-xs);
    }

    .item-stats {
        display: none;
    }

    /* 下载区域浮动卡片移动端改为堆叠布局 */
    .download-visual {
        display: flex;
        flex-direction: column;
        gap: var(--space-md);
        min-height: auto;
    }

    .floating-card {
        position: static;
        animation: none;
        max-width: 100%;
    }
}

/* ============================================
   工具类
   ============================================ */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   打印样式
   ============================================ */

@media print {
    .navbar,
    .hero-actions,
    .cta,
    .footer {
        display: none;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
    }

    section {
        page-break-inside: avoid;
    }
}