/* CSS变量 - 设计系统 2.0 (完全对齐移动应用) */
:root {
    /* ========== 品牌色系统 ========== */
    /* 主薄荷绿 */
    --primary: #4ECDC4;
    --primary-dark: #44A39D;
    --primary-light: #7DE3DC;

    /* 薄荷绿透明度系统 (对齐App) */
    --primary-04: rgba(78, 205, 196, 0.04);
    --primary-08: rgba(78, 205, 196, 0.08);
    --primary-10: rgba(78, 205, 196, 0.1);
    --primary-15: rgba(78, 205, 196, 0.15);
    --primary-20: rgba(78, 205, 196, 0.2);
    --primary-30: rgba(78, 205, 196, 0.3);
    --primary-50: rgba(78, 205, 196, 0.5);

    /* ========== 渐变系统（改为纯色薄荷绿） ========== */
    --gradient-primary: #4ECDC4;
    --gradient-hero: #4ECDC4;
    --gradient-beta: linear-gradient(135deg, #93C5FD 0%, #A5B4FC 50%, #BFDBFE 100%);
    --gradient-gold: linear-gradient(90deg, rgba(255,215,0,0) 0%, rgba(255,215,0,0.7) 50%, rgba(255,215,0,0) 100%);

    /* ========== 文字颜色系统 (对齐App) ========== */
    --text-primary: #1a1a1a;      /* 最深 - 卡片标题 */
    --text-dark: #2D3436;          /* 深色 - 加粗内容 */
    --text-normal: #333333;        /* 主要文本 */
    --text-body: #4A4A4A;          /* 正文内容 */
    --text-secondary: #666666;     /* 辅助文本 */
    --text-light: #999999;         /* 浅色文本 */
    --text-white-90: rgba(255, 255, 255, 0.9);
    --text-white-80: rgba(255, 255, 255, 0.8);

    /* ========== 背景色系统 ========== */
    --bg-primary: #FFFFFF;
    --bg-mint-light: #FAFFFE;      /* 极浅薄荷白 - 核心启示卡片 */
    --bg-secondary: #F5F5F5;       /* 浅灰背景 */
    --bg-tertiary: #F0FFFD;        /* 薄荷渐变背景 */

    /* ========== 边框系统 ========== */
    --border-subtle: rgba(0, 0, 0, 0.04);
    --border-light: rgba(78, 205, 196, 0.1);
    --border-default: rgba(78, 205, 196, 0.2);
    --border-strong: rgba(78, 205, 196, 0.5);

    /* ========== 阴影系统 (分层级) ========== */
    /* 标准黑色阴影 */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 3px 10px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 6px 16px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 32px rgba(0, 0, 0, 0.15);

    /* 品牌色阴影 (特殊强调) */
    --shadow-primary-sm: 0 2px 8px rgba(78, 205, 196, 0.15);
    --shadow-primary-md: 0 4px 12px rgba(78, 205, 196, 0.2);
    --shadow-primary-lg: 0 6px 16px rgba(78, 205, 196, 0.25);
    --shadow-primary-xl: 0 12px 32px rgba(78, 205, 196, 0.3);

    /* ========== 字号系统 (对齐App) ========== */
    --text-xs: 0.625rem;    /* 10px - 极小标注 */
    --text-sm: 0.75rem;     /* 12px - 小号文字 */
    --text-base: 0.875rem;  /* 14px - 辅助信息 */
    --text-md: 0.9375rem;   /* 15px - 卡片内容 */
    --text-lg: 1rem;        /* 16px - 标准正文 */
    --text-xl: 1.125rem;    /* 18px - 大号正文 */
    --text-2xl: 1.25rem;    /* 20px - 子标题 */
    --text-3xl: 1.5rem;     /* 24px - 卡片主标题 */
    --text-4xl: 2rem;       /* 32px - 页面大标题 */
    --text-5xl: 2.5rem;     /* 40px - Hero标题(桌面) */

    /* ========== 字重系统 ========== */
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* ========== 行高系统 ========== */
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 1.75;
    --leading-extra: 2.0;

    /* ========== 字间距系统 (对齐App) ========== */
    --letter-tight: -0.02em;
    --letter-normal: 0;
    --letter-relaxed: 0.3px;
    --letter-wide: 0.5px;
    --letter-wider: 0.8px;
    --letter-extra: 1.5px;

    /* ========== 圆角系统 ========== */
    --radius-xs: 4px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-3xl: 30px;
    --radius-full: 9999px;

    /* ========== 间距系统 (精细化) ========== */
    --spacing-1: 4px;
    --spacing-2: 6px;
    --spacing-3: 8px;
    --spacing-4: 10px;
    --spacing-5: 12px;
    --spacing-6: 14px;
    --spacing-7: 16px;
    --spacing-8: 18px;
    --spacing-9: 20px;
    --spacing-10: 24px;
    --spacing-12: 32px;
    --spacing-16: 40px;
    --spacing-20: 60px;

    /* ========== 装饰色彩 ========== */
    --gold: rgba(255, 215, 0, 0.7);
    --gold-glow: rgba(255, 215, 0, 0.3);
}

/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: var(--letter-relaxed);
}

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

/* ========== 导航栏 (玻璃态 - 对齐App) ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 1000;
    border-bottom: 0.5px solid var(--border-light);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* 导航栏Logo - 薄荷绿光晕 */
.logo-img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    box-shadow: 0 0 12px rgba(78, 205, 196, 0.35),
                0 0 24px rgba(78, 205, 196, 0.25),
                0 0 36px rgba(78, 205, 196, 0.15),
                0 2px 8px rgba(78, 205, 196, 0.2);
    animation: logoGlow 3s ease-in-out infinite;
}

.brand-name {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    background-clip: text;
    letter-spacing: var(--letter-wider);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-normal);
    font-weight: var(--font-medium);
    font-size: var(--text-lg);
    letter-spacing: var(--letter-wide);
    transition: all 0.3s ease;
    position: relative;
    padding-bottom: var(--spacing-1);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 2px;
}

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

.nav-menu a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* ========== Hero区域 (全新设计 2025) ========== */
.hero {
    padding: 160px 0 120px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #FAFFFE 0%, #FFFFFF 50%, #F0FFFD 100%);
}

/* 背景特效层 */
.hero-background-effects {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    overflow: hidden;
}

/* 薄荷绿光晕 */
.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
}

.hero-glow-1 {
    width: 600px;
    height: 600px;
    background: var(--primary);
    top: -200px;
    right: -100px;
    animation: breathe 8s ease-in-out infinite, float 20s ease-in-out infinite;
}

.hero-glow-2 {
    width: 500px;
    height: 500px;
    background: var(--primary);
    bottom: -150px;
    left: -100px;
    animation: breathe 10s ease-in-out infinite reverse, float 25s ease-in-out infinite reverse;
}

/* 装饰图案 */
.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(78, 205, 196, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(78, 205, 196, 0.03) 0%, transparent 50%);
    opacity: 0.5;
}

/* 呼吸动画 (对齐App的光晕效果) */
@keyframes breathe {
    0%, 100% {
        opacity: 0.6;
        transform: scale(1);
    }
    50% {
        opacity: 0.9;
        transform: scale(1.1);
    }
}

/* 浮动动画 */
@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(-30px, 40px); }
    66% { transform: translate(20px, -30px); }
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    position: relative;
    z-index: 1;
}

.hero-main-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

/* Hero Badge */
.hero-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-3) var(--spacing-6);
    background: rgba(78, 205, 196, 0.08);
    border: 1px solid var(--primary-20);
    border-radius: 50px;
    margin-bottom: var(--spacing-10);
    animation: fadeInDown 0.8s ease-out;
}

.badge-text {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--primary);
    letter-spacing: var(--letter-wide);
}

/* Hero Title */
.hero-title {
    margin-bottom: var(--spacing-6);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.title-main {
    display: block;
    font-size: 4.5rem;
    font-weight: var(--font-black);
    color: var(--text-primary);
    letter-spacing: var(--letter-tight);
    line-height: 1.1;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-sub {
    display: block;
    font-size: 2.5rem;
    font-weight: var(--font-semibold);
    color: var(--text-secondary);
    letter-spacing: var(--letter-relaxed);
    margin-top: var(--spacing-3);
}

/* Hero Tagline */
.hero-tagline {
    font-size: var(--text-2xl);
    font-weight: var(--font-medium);
    color: var(--text-dark);
    margin-bottom: var(--spacing-8);
    letter-spacing: var(--letter-relaxed);
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.hero-subtitle {
    font-size: var(--text-3xl);
    font-weight: var(--font-normal);
    margin-bottom: var(--spacing-10);
    opacity: 0.95;
    letter-spacing: var(--letter-relaxed);
    line-height: var(--leading-relaxed);
}

.hero-description {
    font-size: var(--text-lg);
    line-height: var(--leading-extra);
    margin-bottom: var(--spacing-12);
    color: var(--text-body);
    letter-spacing: var(--letter-relaxed);
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-10);
    margin-bottom: var(--spacing-12);
    animation: fadeInUp 0.8s ease-out 0.5s both;
}

.stat-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-5) var(--spacing-6);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-subtle);
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-primary-md);
    border-color: var(--primary-20);
}

.stat-content {
    text-align: left;
}

.stat-label {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-1);
    font-weight: var(--font-medium);
}

.stat-value {
    font-size: var(--text-sm);
    color: var(--text-primary);
    font-weight: var(--font-semibold);
}

/* Hero CTA */
.hero-cta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-5);
    margin-bottom: var(--spacing-10);
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.btn-hero-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-5) var(--spacing-10);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 16px rgba(78, 205, 196, 0.3);
    letter-spacing: var(--letter-relaxed);
}

.btn-hero-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(78, 205, 196, 0.4);
    background: var(--primary-dark);
}

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

.btn-arrow {
    font-size: var(--text-2xl);
    font-weight: 300;
    transition: transform 0.3s ease;
}

.btn-hero-primary:hover .btn-arrow {
    transform: translateX(4px);
}

.btn-hero-secondary {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-5) var(--spacing-8);
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-default);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    text-decoration: none;
    transition: all 0.3s ease;
    letter-spacing: var(--letter-relaxed);
}

.btn-hero-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-04);
    transform: translateY(-2px);
}

/* Hero Trust */
.hero-trust {
    display: flex;
    justify-content: center;
    gap: var(--spacing-8);
    animation: fadeInUp 0.8s ease-out 0.7s both;
}

.trust-item {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: var(--font-medium);
    letter-spacing: var(--letter-wide);
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

/* ========== 按钮系统 (对齐App) ========== */
.btn {
    display: inline-block;
    padding: var(--spacing-6) var(--spacing-10);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: var(--font-semibold);
    font-size: var(--text-lg);
    letter-spacing: var(--letter-wide);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--primary);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.5);
    border: 1.5px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--primary-08);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
    z-index: -1;
}

.btn-primary:hover {
    background: white;
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
    border-color: white;
}

.btn-primary:hover::before {
    width: 400px;
    height: 400px;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: white;
    border: 1.5px solid rgba(255, 255, 255, 0.4);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary);
    transform: translateY(-3px);
    border-color: white;
}

/* ========== Beta标签 (玻璃态 - 对齐App) ========== */
.beta-notice {
    display: flex;
    align-items: center;
    gap: var(--spacing-5);
    margin-top: var(--spacing-9);
}

.beta-tag {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: white;
    padding: var(--spacing-2) var(--spacing-7);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--font-bold);
    letter-spacing: var(--letter-wider);
    border: 1.5px solid rgba(255, 255, 255, 0.35);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.3);
    text-transform: uppercase;
}

.beta-text {
    font-size: var(--text-lg);
    opacity: 0.92;
    font-weight: var(--font-medium);
    letter-spacing: var(--letter-relaxed);
}

.phone-mockup {
    width: 100%;
    max-width: 300px;
    height: auto;
    margin: 0 auto;
    display: block;
    filter: drop-shadow(0 20px 60px rgba(0, 0, 0, 0.25));
    transition: transform 0.6s ease;
}

.phone-mockup:hover {
    transform: translateY(-8px) scale(1.02);
}

/* ========== 功能特色区域 (重新设计) ========== */
/* ========== 核心功能展示区 (世界顶级交互式设计) ========== */
.features-showcase {
    padding: var(--spacing-24) 0 var(--spacing-28);
    background: linear-gradient(180deg, #FFFFFF 0%, #FAFFFE 100%);
    position: relative;
    overflow: hidden;
}

.features-interactive {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-16);
    align-items: center;
    margin-top: var(--spacing-16);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

/* 左侧功能列表 */
.features-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-5);
    padding: var(--spacing-7) var(--spacing-8);
    background: white;
    border-radius: var(--radius-xl);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.feature-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary);
    border-radius: var(--radius-xl) 0 0 var(--radius-xl);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.feature-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-10);
}

.feature-item.active {
    background: var(--primary-04);
    border-color: var(--primary-20);
    transform: translateX(8px);
    box-shadow: var(--shadow-primary-md);
}

.feature-item.active::before {
    opacity: 1;
}

.feature-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: 50%;
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--text-secondary);
    transition: all 0.4s ease;
}

.feature-item.active .feature-number {
    background: var(--primary);
    color: white;
    transform: scale(1.1);
}

.feature-content {
    flex: 1;
}

.feature-content h3 {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin: 0 0 var(--spacing-2) 0;
    letter-spacing: var(--letter-relaxed);
}

.feature-content p {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin: 0;
    letter-spacing: var(--letter-relaxed);
    line-height: var(--leading-relaxed);
}

.feature-arrow {
    font-size: var(--text-2xl);
    color: var(--text-light);
    transition: all 0.3s ease;
    font-weight: 300;
}

.feature-item.active .feature-arrow {
    color: var(--primary);
    transform: translateX(4px);
}

/* 右侧手机展示 */
.phone-showcase {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-frame {
    position: relative;
    width: 340px;
    height: 694px;
    background: #1a1a1a;
    border-radius: 48px;
    padding: 12px;
    box-shadow:
        0 30px 60px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.1),
        inset 0 0 0 2px rgba(255, 255, 255, 0.05);
}

.phone-screen {
    width: 100%;
    height: 100%;
    border-radius: 38px;
    overflow: hidden;
    position: relative;
    background: #000;
}

.screenshot {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.screenshot.active {
    opacity: 1;
    z-index: 1;
}

/* 手机光晕效果 */
.phone-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 420px;
    height: 420px;
    background: radial-gradient(circle, rgba(78, 205, 196, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: pulseGlow 4s ease-in-out infinite;
    z-index: -1;
}

@keyframes pulseGlow {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.5;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.1);
        opacity: 0.8;
    }
}

/* 进度指示器 */
.features-progress {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3);
    margin-top: var(--spacing-16);
}

.progress-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary-20);
    cursor: pointer;
    transition: all 0.3s ease;
}

.progress-dot.active {
    background: var(--primary);
    transform: scale(1.3);
}

.progress-dot:hover {
    background: var(--primary-50);
    transform: scale(1.2);
}

/* 旧版样式保留 */
.features {
    padding: var(--spacing-20) 0;
    background: var(--bg-tertiary);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-primary);
    opacity: 0.3;
}

.section-title {
    text-align: center;
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--spacing-20);
    color: var(--text-primary);
    letter-spacing: var(--letter-tight);
    position: relative;
    padding-bottom: var(--spacing-9);
}

/* 标题装饰线组合 (App风格) */
.section-title::before,
.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}

.section-title::before {
    left: 50%;
    transform: translateX(calc(-50% - 45px));
    width: 30px;
    opacity: 0.4;
}

.section-title::after {
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

/* ========== 功能卡片 (参考App的分段卡片 + 核心启示卡片) ========== */
.feature-card {
    background: var(--bg-primary);
    padding: var(--spacing-12) var(--spacing-10);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 0.5px solid var(--border-subtle);
    position: relative;
    overflow: hidden;
}

/* 左侧渐变条 (参考核心启示卡片) */
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 4px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.4s ease;
}

/* 背景光晕 */
.feature-card::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--primary-04) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-card:hover::after {
    opacity: 1;
}

.feature-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-primary-lg);
    border-color: var(--border-light);
    background: var(--bg-mint-light);
}

.feature-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-10);
    display: inline-block;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    filter: drop-shadow(0 2px 6px var(--primary-15));
    position: relative;
    z-index: 1;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
    filter: drop-shadow(0 4px 12px var(--primary-30));
}

.feature-card h3 {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--spacing-5);
    color: var(--text-primary);
    letter-spacing: var(--letter-relaxed);
    position: relative;
    z-index: 1;
}

.feature-card p {
    color: var(--text-body);
    line-height: var(--leading-relaxed);
    letter-spacing: var(--letter-relaxed);
    font-size: var(--text-md);
    position: relative;
    z-index: 1;
}

/* ========== 产品亮点展示区域 ========== */
.product-highlights {
    padding: var(--spacing-24) 0;
    background: var(--bg-primary);
    position: relative;
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-8);
    margin-top: var(--spacing-16);
}

.highlight-card {
    background: white;
    padding: var(--spacing-10);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-subtle);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.highlight-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.highlight-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-primary-lg);
    border-color: var(--primary-20);
}

.highlight-card:hover::before {
    opacity: 1;
}

.highlight-primary {
    background: linear-gradient(135deg, rgba(78, 205, 196, 0.03) 0%, rgba(78, 205, 196, 0.08) 100%);
    border-color: var(--primary-20);
}

.highlight-primary::before {
    opacity: 1;
    height: 4px;
}


.highlight-card h3 {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-4);
    letter-spacing: var(--letter-relaxed);
}

.highlight-card p {
    font-size: var(--text-base);
    color: var(--text-body);
    line-height: var(--leading-relaxed);
    letter-spacing: var(--letter-relaxed);
}

.highlight-badge {
    display: inline-block;
    margin-top: var(--spacing-5);
    padding: var(--spacing-2) var(--spacing-5);
    background: var(--primary);
    color: white;
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    border-radius: 50px;
    letter-spacing: var(--letter-wide);
}

/* ========== App截图展示区域 (已废弃，改用产品亮点) ========== */
.screenshots-showcase {
    padding: var(--spacing-24) 0;
    background: linear-gradient(180deg, #FAFFFE 0%, #FFFFFF 100%);
    position: relative;
    overflow: hidden;
    display: none; /* 暂时隐藏 */
}

.section-subtitle {
    text-align: center;
    font-size: var(--text-lg);
    color: var(--text-secondary);
    margin-top: var(--spacing-4);
    margin-bottom: var(--spacing-16);
    letter-spacing: var(--letter-relaxed);
}

.screenshots-container {
    position: relative;
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE/Edge */
    scroll-behavior: smooth;
    padding: var(--spacing-8) 0;
}

.screenshots-container::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
}

.screenshot-track {
    display: flex;
    gap: var(--spacing-8);
    padding: 0 max(calc((100vw - 1200px) / 2), var(--spacing-6));
    width: max-content;
}

.screenshot-item {
    flex-shrink: 0;
    width: 280px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-5);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.screenshot-item:hover {
    transform: translateY(-8px);
}

.screenshot-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-2xl);
    box-shadow:
        0 8px 24px rgba(0, 0, 0, 0.12),
        0 2px 8px rgba(0, 0, 0, 0.08),
        0 0 0 0.5px rgba(0, 0, 0, 0.05);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    background: #F5F5F5;
    aspect-ratio: 9 / 19.5; /* iPhone比例 */
    object-fit: cover;
}

.screenshot-item:hover .screenshot-img {
    box-shadow:
        0 16px 48px rgba(78, 205, 196, 0.2),
        0 8px 24px rgba(0, 0, 0, 0.12),
        0 0 0 1px var(--primary-20);
    transform: scale(1.02);
}

.screenshot-caption {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: var(--font-medium);
    letter-spacing: var(--letter-relaxed);
    text-align: center;
}

/* 导航点 */
.screenshot-dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3);
    margin-top: var(--spacing-12);
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-20);
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot.active {
    background: var(--primary);
    transform: scale(1.25);
}

.dot:hover {
    background: var(--primary-50);
    transform: scale(1.15);
}

/* ========== FAQ常见问题区域 ========== */
.faq-section {
    padding: var(--spacing-24) 0;
    background: linear-gradient(180deg, #FFFFFF 0%, #FAFFFE 100%);
}

.faq-container {
    max-width: 900px;
    margin: 0 auto;
    margin-top: var(--spacing-16);
}

.faq-item {
    background: white;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-5);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-subtle);
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-20);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-7);
    cursor: pointer;
    user-select: none;
    transition: background 0.3s ease;
}

.faq-question:hover {
    background: var(--primary-04);
}

.faq-question h3 {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    letter-spacing: var(--letter-relaxed);
    margin: 0;
}

.faq-toggle {
    font-size: var(--text-3xl);
    color: var(--primary);
    font-weight: var(--font-light);
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--primary-08);
    transition: all 0.3s ease;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
    background: var(--primary);
    color: white;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                padding 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 var(--spacing-7) var(--spacing-7);
}

.faq-answer p {
    font-size: var(--text-base);
    color: var(--text-body);
    line-height: var(--leading-relaxed);
    letter-spacing: var(--letter-relaxed);
    margin: 0;
}

/* ========== 技术特点区域 ========== */
.tech-advantages {
    padding: var(--spacing-20) 0;
    background: var(--bg-primary);
    position: relative;
}

.tech-advantages::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-primary);
    opacity: 0.15;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

/* ========== 技术栈卡片 (参考App的标准卡片) ========== */
.tech-item {
    text-align: center;
    padding: var(--spacing-12) var(--spacing-9);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 0.5px solid var(--border-subtle);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

/* 顶部渐变条 */
.tech-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.tech-item:hover::before {
    transform: scaleX(1);
}

.tech-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-primary-md);
    border-color: var(--border-light);
}

.tech-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-9);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    filter: drop-shadow(0 2px 6px var(--primary-10));
}

.tech-item:hover .tech-icon {
    transform: scale(1.15) rotate(3deg);
    filter: drop-shadow(0 4px 10px var(--primary-20));
}

.tech-item h3 {
    font-size: var(--text-2xl);
    font-weight: var(--font-semibold);
    margin-bottom: var(--spacing-5);
    color: var(--text-primary);
    letter-spacing: var(--letter-relaxed);
    transition: color 0.3s ease;
}

.tech-item:hover h3 {
    color: var(--primary);
}

.tech-item h4 {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    margin-bottom: var(--spacing-5);
    color: var(--text-normal);
    letter-spacing: var(--letter-relaxed);
    transition: color 0.3s ease;
}

.tech-item:hover h4 {
    color: var(--primary);
}

.tech-item p {
    color: var(--text-body);
    line-height: var(--leading-relaxed);
    letter-spacing: var(--letter-relaxed);
    font-size: var(--text-md);
}

/* ========== 下载区域 (CTA - 完全重做) ========== */
.download {
    padding: var(--spacing-20) 0;
    background: var(--gradient-hero);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* 背景光晕 - 更大更柔和 */
.download::before {
    content: '';
    position: absolute;
    top: -35%;
    left: -5%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.08) 30%, transparent 70%);
    border-radius: 50%;
    animation: breathe 7s ease-in-out infinite, float 18s ease-in-out infinite;
    opacity: 0.7;
}

.download .section-title {
    color: white;
    font-size: var(--text-4xl);
}

.download .section-title::before,
.download .section-title::after {
    background: white;
    opacity: 0.6;
}

.download-description {
    font-size: var(--text-2xl);
    margin-bottom: var(--spacing-20);
    opacity: 0.95;
    font-weight: var(--font-medium);
    letter-spacing: var(--letter-relaxed);
    line-height: var(--leading-relaxed);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.download-buttons {
    display: flex;
    justify-content: center;
    margin-bottom: 50px;
}

.download-btn-container {
    text-align: center;
}

/* ========== 下载按钮 (玻璃态 - 对齐App) ========== */
.download-btn.ios-beta {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--primary);
    padding: var(--spacing-8) var(--spacing-20);
    border-radius: var(--radius-lg);
    display: inline-block;
    margin-bottom: var(--spacing-9);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid rgba(255, 255, 255, 0.8);
    cursor: pointer;
    font-family: inherit;
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    letter-spacing: var(--letter-wide);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2),
                inset 0 1px 0 rgba(255, 255, 255, 0.5);
    position: relative;
    z-index: 1;
}

.download-btn.ios-beta:hover {
    transform: translateY(-4px) scale(1.03);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
    background: white;
    border-color: white;
}

.download-note {
    font-size: var(--text-lg);
    opacity: 0.9;
    margin: 0;
    font-weight: var(--font-medium);
    letter-spacing: var(--letter-relaxed);
}

/* ========== 开发状态信息 (玻璃态卡片) ========== */
.status-info {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1.5px solid rgba(255, 255, 255, 0.35);
    padding: var(--spacing-12);
    border-radius: var(--radius-xl);
    margin-top: var(--spacing-16);
    text-align: left;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.status-info h4 {
    font-size: var(--text-2xl);
    margin-bottom: var(--spacing-9);
    color: white;
    font-weight: var(--font-bold);
    letter-spacing: var(--letter-wide);
}

.status-info ul {
    list-style: none;
    padding: 0;
}

.status-info li {
    padding: var(--spacing-4) 0;
    font-size: var(--text-lg);
    opacity: 0.95;
    letter-spacing: var(--letter-relaxed);
}

/* 关于应用 */
.about {
    padding: 100px 0;
    background: #f8fbff;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 24px;
    color: #555;
}

/* 开发状态显示 */
.development-status {
    display: flex;
    gap: 40px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.status-item {
    text-align: center;
    min-width: 120px;
}

.status-label {
    display: block;
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 8px;
}

.status-value {
    display: block;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary);
}

.about-image img {
    width: 100%;
    border-radius: 16px;
    box-shadow: 0 12px 40px rgba(74, 144, 226, 0.1);
}

/* 技术支持 */
/* ========== 联系我们区域 ========== */
.contact-section {
    padding: var(--spacing-24) 0;
    background: linear-gradient(180deg, #FFFFFF 0%, var(--bg-mint-light) 100%);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-16);
    margin-top: var(--spacing-12);
}

.contact-cards {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.contact-card {
    background: white;
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    border: 2px solid var(--primary-08);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.contact-card:hover {
    border-color: var(--primary-20);
    background: var(--primary-04);
    transform: translateX(8px);
    box-shadow: var(--shadow-primary-md);
}

.contact-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-08);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-4);
    color: var(--primary);
    transition: all 0.3s ease;
}

.contact-card:hover .contact-icon {
    background: var(--primary-15);
    transform: scale(1.1);
}

.contact-card h4 {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

.contact-card p {
    font-size: var(--text-base);
    color: var(--text-body);
    margin-bottom: var(--spacing-2);
}

.contact-note {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

/* 反馈表单容器 */
.feedback-form-container {
    background: white;
    padding: var(--spacing-10);
    border-radius: var(--radius-2xl);
    border: 2px solid var(--primary-08);
    box-shadow: var(--shadow-lg);
}

.feedback-form-header {
    margin-bottom: var(--spacing-8);
}

.feedback-form-header h3 {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

.feedback-form-header p {
    font-size: var(--text-base);
    color: var(--text-secondary);
}

/* 表单样式 */
.feedback-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-4);
}

.feedback-form .form-group {
    margin-bottom: var(--spacing-4);
}

.feedback-form label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-dark);
    margin-bottom: var(--spacing-2);
}

.feedback-form input,
.feedback-form textarea {
    width: 100%;
    padding: var(--spacing-4);
    font-size: var(--text-base);
    color: var(--text-primary);
    background: var(--bg-mint-light);
    border: 2px solid var(--primary-08);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    font-family: inherit;
}

.feedback-form input:focus,
.feedback-form textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 4px var(--primary-10);
}

.feedback-form input::placeholder,
.feedback-form textarea::placeholder {
    color: var(--text-light);
}

.feedback-form textarea {
    resize: vertical;
    min-height: 140px;
}

.btn-submit-feedback {
    width: 100%;
    padding: var(--spacing-4) var(--spacing-6);
    background: var(--primary);
    color: white;
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    transition: all 0.3s ease;
}

.btn-submit-feedback:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(78, 205, 196, 0.3);
}

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

.btn-submit-feedback svg {
    transition: transform 0.3s ease;
}

.btn-submit-feedback:hover svg {
    transform: translateX(4px);
}

/* 响应式 */
@media (max-width: 1024px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
    }

    .contact-cards {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-4);
    }
}

@media (max-width: 768px) {
    .contact-cards {
        grid-template-columns: 1fr;
    }

    .feedback-form .form-row {
        grid-template-columns: 1fr;
    }

    .feedback-form-container {
        padding: var(--spacing-6);
    }
}

/* ========== 页脚 (对齐App配色) ========== */
.footer {
    background: linear-gradient(135deg, #1a1a1a 0%, #2D3436 100%);
    color: rgba(255, 255, 255, 0.9);
    padding: var(--spacing-20) 0 var(--spacing-12);
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0.5;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

/* Footer Logo - 薄荷绿光晕 */
.footer-logo img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    box-shadow: 0 0 12px rgba(78, 205, 196, 0.35),
                0 0 24px rgba(78, 205, 196, 0.25),
                0 0 36px rgba(78, 205, 196, 0.15),
                0 2px 8px rgba(78, 205, 196, 0.2);
    animation: logoGlow 3s ease-in-out infinite;
}

.footer-logo span {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: var(--letter-wider);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 30px;
}

.link-group h5 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--primary-light);
}

.link-group ul {
    list-style: none;
}

.link-group li {
    margin-bottom: 8px;
}

.link-group a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: var(--text-md);
    letter-spacing: var(--letter-relaxed);
}

.link-group a:hover {
    color: var(--primary);
    transform: translateX(3px);
}

.footer-bottom {
    border-top: 0.5px solid rgba(78, 205, 196, 0.2);
    padding-top: var(--spacing-9);
    text-align: center;
    margin-top: var(--spacing-12);
}

.footer-bottom p {
    margin-bottom: var(--spacing-3);
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--text-base);
    letter-spacing: var(--letter-relaxed);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* ========== 模态框 (对齐App) ========== */
/* ========== 模态框系统 (精致升级版) ========== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: block;
    opacity: 1;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: white;
    border-radius: var(--radius-2xl);
    width: 90%;
    max-width: 480px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal.show .modal-content {
    transform: translate(-50%, -50%) scale(1);
}

/* 精致关闭按钮 */
.modal-close {
    position: absolute;
    top: var(--spacing-6);
    right: var(--spacing-6);
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: var(--primary-04);
    transform: rotate(90deg);
}

.close-line {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 18px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 2px;
    transition: background 0.3s ease;
}

.modal-close:hover .close-line {
    background: var(--primary);
}

.close-line-1 {
    transform: translate(-50%, -50%) rotate(45deg);
}

.close-line-2 {
    transform: translate(-50%, -50%) rotate(-45deg);
}

/* 模态框头部 */
.modal-header {
    text-align: center;
    padding: var(--spacing-12) var(--spacing-10) var(--spacing-8);
}

.modal-logo-wrapper {
    display: inline-flex;
    margin-bottom: var(--spacing-6);
}

.modal-logo {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    box-shadow: 0 0 20px rgba(78, 205, 196, 0.4),
                0 0 40px rgba(78, 205, 196, 0.3),
                0 4px 12px rgba(78, 205, 196, 0.25);
    animation: logoGlow 3s ease-in-out infinite;
}

.modal-title {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin: 0 0 var(--spacing-3) 0;
    letter-spacing: var(--letter-relaxed);
}

.modal-subtitle {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin: 0;
    letter-spacing: var(--letter-relaxed);
}

/* Logo呼吸光晕动画 */
@keyframes logoGlow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(78, 205, 196, 0.4),
                    0 0 40px rgba(78, 205, 196, 0.3),
                    0 0 60px rgba(78, 205, 196, 0.2),
                    0 4px 12px rgba(78, 205, 196, 0.25);
    }
    50% {
        box-shadow: 0 0 30px rgba(78, 205, 196, 0.6),
                    0 0 60px rgba(78, 205, 196, 0.4),
                    0 0 90px rgba(78, 205, 196, 0.3),
                    0 6px 16px rgba(78, 205, 196, 0.35);
    }
}

.beta-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--gradient-primary);
    color: white;
    font-size: var(--text-xs);
    font-weight: var(--font-bold);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-md);
    letter-spacing: var(--letter-wider);
    box-shadow: var(--shadow-primary-sm);
    text-transform: uppercase;
}

/* 模态框主体 */
.modal-body {
    padding: 0 var(--spacing-10) var(--spacing-10);
}

.modal-form {
    width: 100%;
}

.form-group {
    margin-bottom: var(--spacing-6);
}

.form-row {
    display: flex;
    gap: var(--spacing-4);
}

.form-group-half {
    flex: 1;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-3);
    color: var(--text-dark);
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
    letter-spacing: var(--letter-relaxed);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-4) var(--spacing-5);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    letter-spacing: var(--letter-relaxed);
    transition: all 0.3s ease;
    font-family: inherit;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-08);
}

.form-group textarea {
    resize: vertical;
    min-height: 72px;
    line-height: var(--leading-relaxed);
}

.form-hint {
    margin-top: var(--spacing-2);
    font-size: var(--text-xs);
    color: var(--text-secondary);
    letter-spacing: var(--letter-relaxed);
}

/* 设备选择器 */
.device-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.device-option input[type="radio"] {
    display: none;
}

.device-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-5);
    border: 1.5px solid var(--border-subtle);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    background: white;
}

.device-label:hover {
    border-color: var(--primary-30);
    background: var(--primary-04);
}

.device-option input:checked + .device-label {
    border-color: var(--primary);
    background: var(--primary-04);
}

.device-content {
    flex: 1;
}

.device-name {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-1);
}

.device-desc {
    font-size: var(--text-xs);
    color: var(--text-secondary);
}

.device-check {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-default);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.device-option input:checked + .device-label .device-check {
    background: var(--primary);
    border-color: var(--primary);
}

.device-option input:checked + .device-label .device-check::after {
    content: '✓';
    color: white;
    font-size: 12px;
    font-weight: bold;
}

/* 提交按钮 */
.form-actions {
    margin-top: var(--spacing-8);
}

.btn-submit {
    width: 100%;
    padding: var(--spacing-5) var(--spacing-8);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: var(--letter-relaxed);
}

.btn-submit:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(78, 205, 196, 0.3);
}

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

/* ========== 成功模态框 ========== */
.modal-success {
    max-width: 420px;
    text-align: center;
    padding: var(--spacing-12) var(--spacing-10);
}

.success-animation {
    margin-bottom: var(--spacing-8);
}

.success-checkmark {
    width: 80px;
    height: 80px;
    margin: 0 auto;
    position: relative;
    animation: scaleIn 0.5s ease-out;
}

@keyframes scaleIn {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.check-icon {
    width: 80px;
    height: 80px;
    position: relative;
    border-radius: 50%;
    box-sizing: content-box;
    border: 4px solid var(--primary);
}

.check-icon::before {
    top: 3px;
    left: -2px;
    width: 30px;
    transform-origin: 100% 50%;
    border-radius: 100px 0 0 100px;
}

.check-icon::after {
    top: 0;
    left: 30px;
    width: 60px;
    transform-origin: 0 50%;
    border-radius: 0 100px 100px 0;
    animation: rotateCircle 4.25s ease-in;
}

.icon-line {
    height: 5px;
    background-color: var(--primary);
    display: block;
    border-radius: 2px;
    position: absolute;
    z-index: 10;
}

.icon-line.line-tip {
    top: 42px;
    left: 14px;
    width: 25px;
    transform: rotate(45deg);
    animation: checkTip 0.75s ease 0.3s;
    animation-fill-mode: forwards;
    opacity: 0;
}

.icon-line.line-long {
    top: 35px;
    right: 8px;
    width: 47px;
    transform: rotate(-45deg);
    animation: checkLong 0.75s ease 0.5s;
    animation-fill-mode: forwards;
    opacity: 0;
}

@keyframes checkTip {
    0% {
        width: 0;
        left: 14px;
        top: 42px;
        opacity: 0;
    }
    100% {
        width: 25px;
        left: 14px;
        top: 42px;
        opacity: 1;
    }
}

@keyframes checkLong {
    0% {
        width: 0;
        right: 8px;
        top: 35px;
        opacity: 0;
    }
    100% {
        width: 47px;
        right: 8px;
        top: 35px;
        opacity: 1;
    }
}

.icon-circle {
    top: -4px;
    left: -4px;
    z-index: 10;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    position: absolute;
    box-sizing: content-box;
    border: 4px solid rgba(78, 205, 196, 0.5);
}

.icon-fix {
    top: 8px;
    width: 5px;
    left: 26px;
    z-index: 1;
    height: 85px;
    position: absolute;
    transform: rotate(-45deg);
    background-color: white;
}

.success-title {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin: 0 0 var(--spacing-5) 0;
    letter-spacing: var(--letter-relaxed);
}

.success-message {
    font-size: var(--text-base);
    color: var(--text-body);
    margin-bottom: var(--spacing-3);
    line-height: var(--leading-relaxed);
    letter-spacing: var(--letter-relaxed);
}

.success-note {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-10);
    letter-spacing: var(--letter-relaxed);
}

.success-tip {
    color: #666;
    margin-bottom: 30px;
    line-height: 1.6;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 20px 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-container {
        padding: 0 var(--spacing-5);
    }

    .title-main {
        font-size: 3rem;
    }

    .title-sub {
        font-size: 1.8rem;
    }

    .hero-tagline {
        font-size: var(--text-xl);
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-5);
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }

    .stat-item {
        width: 100%;
    }

    .hero-cta {
        flex-direction: column;
        gap: var(--spacing-4);
    }

    .btn-hero-primary,
    .btn-hero-secondary {
        width: 100%;
        justify-content: center;
    }

    .hero-trust {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .development-status {
        justify-content: center;
    }

    .modal-content {
        width: 95%;
        margin: 20px;
    }

    .modal-header,
    .modal-body {
        padding: 16px;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .form-group-half {
        margin-bottom: 20px;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-row {
        gap: 12px;
    }

    /* 截图展示响应式 */
    .screenshot-item {
        width: 220px;
    }

    .screenshot-track {
        padding: 0 var(--spacing-6);
    }
}

@media (max-width: 480px) {
    .title-main {
        font-size: 2.5rem;
    }

    .title-sub {
        font-size: 1.5rem;
    }

    .hero-tagline {
        font-size: var(--text-lg);
    }

    .hero-description {
        font-size: var(--text-base);
    }

    .btn-hero-primary {
        padding: var(--spacing-4) var(--spacing-8);
        font-size: var(--text-base);
    }

    .section-title {
        font-size: 2rem;
    }
    
    .feature-card,
    .tech-item {
        padding: 24px;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 12px;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }

    .beta-notice {
        justify-content: center;
    }

    /* 截图展示响应式 - 小屏 */
    .screenshot-item {
        width: 180px;
    }

    .section-subtitle {
        font-size: var(--text-base);
        padding: 0 var(--spacing-4);
    }

    .development-status {
        flex-direction: column;
        gap: 20px;
    }

    .modal-header,
    .modal-body {
        padding: 16px;
    }
}

/* ========== 动画系统 (对齐App) ========== */

/* 淡入上升动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* 脉冲动画 (用于强调元素) */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.85;
        transform: scale(1.03);
    }
}

/* 金色闪光动画 */
@keyframes shimmer {
    0% {
        background-position: -100% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* 滚动触发动画 - 初始状态（默认显示，避免JavaScript未加载时不可见） */
.feature-card,
.tech-item {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 添加will-animate类来启用动画（通过JavaScript控制） */
.feature-card.will-animate,
.tech-item.will-animate {
    opacity: 0;
    transform: translateY(40px);
}

/* 动画进入状态 */
.feature-card.animate-in,
.tech-item.animate-in {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* 为不同卡片添加延迟 (更长的间隔) */
.feature-card:nth-child(1) { transition-delay: 0.1s; }
.feature-card:nth-child(2) { transition-delay: 0.25s; }
.feature-card:nth-child(3) { transition-delay: 0.4s; }
.feature-card:nth-child(4) { transition-delay: 0.55s; }
.feature-card:nth-child(5) { transition-delay: 0.7s; }
.feature-card:nth-child(6) { transition-delay: 0.85s; }

.tech-item:nth-child(1) { transition-delay: 0.1s; }
.tech-item:nth-child(2) { transition-delay: 0.25s; }
.tech-item:nth-child(3) { transition-delay: 0.4s; }
.tech-item:nth-child(4) { transition-delay: 0.55s; }

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}