/* ===================================
   FlowChat - 现代化聊天APP官网样式
   =================================== */

/* CSS Variables */
:root {
    /* Colors - Vibrant Purple Theme */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #a855f7;
    
    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Neutrals */
    --white: #ffffff;
    --gray-50: #fafafa;
    --gray-100: #f4f4f5;
    --gray-200: #e4e4e7;
    --gray-300: #d4d4d8;
    --gray-400: #a1a1aa;
    --gray-500: #71717a;
    --gray-600: #52525b;
    --gray-700: #3f3f46;
    --gray-800: #27272a;
    --gray-900: #18181b;
    --black: #09090b;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --gradient-dark: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4c1d95 100%);
    --gradient-light: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 50%, #ddd6fe 100%);
    
    /* Typography */
    --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    
    /* Spacing */
    --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;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    --shadow-glow-lg: 0 0 80px rgba(99, 102, 241, 0.4);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    color: var(--gray-800);
    line-height: 1.6;
    background: var(--white);
    overflow-x: hidden;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

/* Container */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

.text-gradient {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    -webkit-background-clip: text;
    -moz-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: #6366f1; /* Fallback */
}

.text-gradient-light {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -moz-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: #6366f1; /* Fallback */
}

/* ===================================
   Header & Navigation
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar {
    padding: 1rem 0;
    background: rgba(255, 255, 255, 0.95);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

@supports (backdrop-filter: blur(20px)) or (-webkit-backdrop-filter: blur(20px)) {
    .navbar {
        background: rgba(255, 255, 255, 0.8);
    }
}

.header.scrolled .navbar {
    padding: var(--space-sm) 0;
    box-shadow: var(--shadow-md);
}

.nav-content {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: justify;
    -ms-flex-pack: justify;
    justify-content: space-between;
    gap: 2rem;
}

.logo {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 700;
    font-size: 1.5rem;
    color: #18181b;
}

.logo img {
    width: 48px;
    height: 48px;
}

.logo-text {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    -webkit-background-clip: text;
    -moz-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: #6366f1; /* Fallback */
}

.nav-links {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--gray-600);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

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

.btn-nav {
    padding: 0.5rem 1.5rem;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    color: #ffffff;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all 250ms ease;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
    z-index: 1001;
}

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

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    z-index: 999;
    padding: 100px var(--space-lg) var(--space-xl);
    transform: translateY(-100%);
    transition: transform var(--transition-slow);
}

.mobile-menu.active {
    transform: translateY(0);
}

.mobile-menu ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.mobile-menu a {
    display: block;
    padding: var(--space-md);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.mobile-menu a:hover {
    background: var(--gray-100);
    color: var(--primary);
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: -webkit-inline-box;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 1rem;
    -webkit-transition: all 250ms ease;
    transition: all 250ms ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-lg {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1.125rem;
}

.btn-primary {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    color: #ffffff;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.45);
}

.btn-ghost {
    background: transparent;
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-white {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    color: #ffffff;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.35);
}

.btn-white:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.45);
}

.btn-full {
    width: 100%;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
    /* 直接设置背景作为回退 */
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4c1d95 100%);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0e7ff 25%, #ddd6fe 50%, #fae8ff 75%, #fce7f3 100%);
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(99, 102, 241, 0.15) 0%, transparent 50%);
}

.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, transparent 70%);
    -webkit-filter: blur(60px);
    filter: blur(60px);
    -webkit-animation: pulse 8s ease-in-out infinite;
    animation: pulse 8s ease-in-out infinite;
}

.hero-decorations {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    pointer-events: none;
}

.decoration {
    position: absolute;
    border-radius: 50%;
}

.decoration-1 {
    width: 200px;
    height: 200px;
    top: 10%;
    left: 5%;
    background: linear-gradient(135deg, #93c5fd 0%, #c4b5fd 100%);
    opacity: 0.4;
    box-shadow: 0 20px 60px rgba(147, 197, 253, 0.3), inset 0 -10px 30px rgba(99, 102, 241, 0.1);
    -webkit-animation: float-decoration 8s ease-in-out infinite;
    animation: float-decoration 8s ease-in-out infinite;
}

.decoration-2 {
    width: 150px;
    height: 150px;
    top: 50%;
    right: 8%;
    background: linear-gradient(135deg, #f9a8d4 0%, #fbcfe8 100%);
    opacity: 0.45;
    box-shadow: 0 15px 50px rgba(249, 168, 212, 0.3), inset 0 -8px 25px rgba(236, 72, 153, 0.1);
    -webkit-animation: float-decoration 10s ease-in-out infinite 1s;
    animation: float-decoration 10s ease-in-out infinite 1s;
}

.decoration-3 {
    width: 120px;
    height: 120px;
    bottom: 15%;
    left: 10%;
    background: linear-gradient(135deg, #c4b5fd 0%, #e9d5ff 100%);
    opacity: 0.4;
    box-shadow: 0 12px 40px rgba(196, 181, 253, 0.3), inset 0 -6px 20px rgba(139, 92, 246, 0.1);
    -webkit-animation: float-decoration 12s ease-in-out infinite 2s;
    animation: float-decoration 12s ease-in-out infinite 2s;
}

.decoration-4 {
    width: 180px;
    height: 180px;
    top: 25%;
    right: 25%;
    background: linear-gradient(135deg, #ddd6fe 0%, #f9a8d4 100%);
    opacity: 0.35;
    box-shadow: 0 18px 55px rgba(221, 214, 254, 0.3), inset 0 -9px 28px rgba(168, 85, 247, 0.1);
    -webkit-animation: float-decoration 9s ease-in-out infinite 0.5s;
    animation: float-decoration 9s ease-in-out infinite 0.5s;
}

@-webkit-keyframes float-decoration {
    0%, 100% {
        -webkit-transform: translateY(0) scale(1);
        transform: translateY(0) scale(1);
    }
    50% {
        -webkit-transform: translateY(-20px) scale(1.05);
        transform: translateY(-20px) scale(1.05);
    }
}

@keyframes float-decoration {
    0%, 100% {
        -webkit-transform: translateY(0) scale(1);
        transform: translateY(0) scale(1);
    }
    50% {
        -webkit-transform: translateY(-20px) scale(1.05);
        transform: translateY(-20px) scale(1.05);
    }
}


@-webkit-keyframes pulse {
    0%, 100% { -webkit-transform: translate(-50%, -50%) scale(1); transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
    50% { -webkit-transform: translate(-50%, -50%) scale(1.1); transform: translate(-50%, -50%) scale(1.1); opacity: 0.7; }
}

@keyframes pulse {
    0%, 100% { -webkit-transform: translate(-50%, -50%) scale(1); transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
    50% { -webkit-transform: translate(-50%, -50%) scale(1.1); transform: translate(-50%, -50%) scale(1.1); opacity: 0.7; }
}

.hero .container {
    position: relative;
    z-index: 1;
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 6rem 1fr;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
}

.hero-content {
    color: #1e293b;
}

.hero-badge {
    display: -webkit-inline-box;
    display: -ms-inline-flexbox;
    display: inline-flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(139, 92, 246, 0.12));
    border: none;
    border-radius: 9999px;
    font-size: 0.875rem;
    margin-bottom: 2rem;
    color: #5b21b6;
    font-weight: 600;
}

.hero-badge-mobile {
    display: none;
}

.hero-badge-desktop {
    display: -webkit-inline-box;
    display: -ms-inline-flexbox;
    display: inline-flex;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.5);
    -webkit-animation: fadeInUp 0.6s ease-out;
    animation: fadeInUp 0.6s ease-out;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
    -webkit-animation: blink 2s ease-in-out infinite;
    animation: blink 2s ease-in-out infinite;
}

@-webkit-keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

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

.hero h1 {
    color: #0f172a;
    margin-bottom: 1.5rem;
    -webkit-animation: fadeInUp 0.6s ease-out 0.1s backwards;
    animation: fadeInUp 0.6s ease-out 0.1s backwards;
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 3rem;
    line-height: 1.8;
    -webkit-animation: fadeInUp 0.6s ease-out 0.2s backwards;
    animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

.hero-buttons {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    gap: 1rem;
    margin-bottom: 4rem;
    -webkit-animation: fadeInUp 0.6s ease-out 0.3s backwards;
    animation: fadeInUp 0.6s ease-out 0.3s backwards;
}

.hero-stats {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 2rem;
    -webkit-animation: fadeInUp 0.6s ease-out 0.4s backwards;
    animation: fadeInUp 0.6s ease-out 0.4s backwards;
}

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

.stat-item .stat-number,
.stat-item .stat-suffix {
    display: inline;
    vertical-align: baseline;
}

.stat-item .stat-number {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -moz-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-item .stat-suffix {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -moz-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    opacity: 0.9;
}

.stat-item .stat-label {
    display: block;
    font-size: 0.875rem;
    color: #64748b;
    font-weight: 500;
    opacity: 0.7;
    margin-top: 0.25rem;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-animation: fadeInUp 0.8s ease-out 0.5s backwards;
    animation: fadeInUp 0.8s ease-out 0.5s backwards;
}

.phone-container {
    position: relative;
}

.phone-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.4) 0%, transparent 70%);
    filter: blur(40px);
    z-index: -1;
}

.hero-phone {
    width: 320px;
    height: auto;
    -webkit-filter: drop-shadow(0 30px 60px rgba(0, 0, 0, 0.4));
    filter: drop-shadow(0 30px 60px rgba(0, 0, 0, 0.4));
    -webkit-animation: float 6s ease-in-out infinite;
    animation: float 6s ease-in-out infinite;
}

@-webkit-keyframes float {
    0%, 100% { -webkit-transform: translateY(0); transform: translateY(0); }
    50% { -webkit-transform: translateY(-20px); transform: translateY(-20px); }
}

@keyframes float {
    0%, 100% { -webkit-transform: translateY(0); transform: translateY(0); }
    50% { -webkit-transform: translateY(-20px); transform: translateY(-20px); }
}

/* Floating Cards */
.floating-card {
    position: absolute;
    background: #ffffff;
    border-radius: 1rem;
    padding: 1rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    -webkit-animation: floatCard 4s ease-in-out infinite;
    animation: floatCard 4s ease-in-out infinite;
}

.card-1 {
    top: 20%;
    left: -60px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    animation-delay: 0s;
}

.card-1 .card-avatar {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 50%;
}

.card-1 .card-name {
    font-weight: 600;
    color: var(--gray-800);
    font-size: 0.875rem;
}

.card-1 .card-msg {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.card-2 {
    top: 50%;
    right: -40px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    animation-delay: 1s;
}

.card-3 {
    bottom: 20%;
    left: -40px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    animation-delay: 2s;
}

.card-icon {
    font-size: 1.5rem;
}

.card-text {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
}

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

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

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    -webkit-transform: translateX(-50%);
    transform: translateX(-50%);
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    color: rgba(100, 116, 139, 0.4);
    gap: 0.5rem;
    font-size: 0.8rem;
    opacity: 0.6;
    -webkit-animation: bounce 2s infinite;
    animation: bounce 2s infinite;
}

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

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

@-webkit-keyframes fadeInUp {
    from {
        opacity: 0;
        -webkit-transform: translateY(30px);
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        -webkit-transform: translateY(30px);
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
}

/* ===================================
   Section Styles
   =================================== */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-4xl);
}

.section-header.light {
    color: #1e293b;
}

.section-header.light h2 {
    color: #0f172a;
}

.section-header.light p {
    color: #475569;
}

.section-tag {
    display: inline-block;
    padding: var(--space-sm) var(--space-md);
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.section-header.light .section-tag {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(139, 92, 246, 0.12));
    color: #5b21b6;
    border: none;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.section-header h2 {
    margin-bottom: var(--space-md);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--gray-500);
}

/* ===================================
   Features Section
   =================================== */
.features {
    padding: 6rem 0;
    background: #fafafa;
}

.features-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 2rem 1fr 2rem 1fr;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background: #ffffff;
    padding: 3rem;
    border-radius: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    -webkit-transition: all 250ms ease;
    transition: all 250ms ease;
    border: 1px solid #f4f4f5;
}

.feature-card:hover {
    -webkit-transform: translateY(-8px);
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    border-color: #818cf8;
}

.feature-icon-wrap {
    width: 80px;
    height: 80px;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
    border-radius: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
    position: relative;
}

.feature-icon-wrap::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 1rem;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0) 100%);
    pointer-events: none;
}

.feature-icon-wrap svg {
    position: relative;
    z-index: 1;
    filter: brightness(0) invert(1);
}

.feature-icon-wrap img {
    width: 48px;
    height: 48px;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: #27272a;
}

.feature-card p {
    color: #71717a;
    line-height: 1.8;
}

/* ===================================
   Download Section
   =================================== */
.download {
    position: relative;
    padding: 6rem 0;
    overflow: hidden;
    background: linear-gradient(135deg, #fce7f3 0%, #ddd6fe 25%, #e0e7ff 50%, #f0f9ff 75%, #e0f2fe 100%);
}

.download-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.download-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #fce7f3 0%, #ddd6fe 25%, #e0e7ff 50%, #f0f9ff 75%, #e0f2fe 100%);
}

.download > .container {
    position: relative;
    z-index: 1;
}

.download-shapes {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.03);
}

.shape-1 {
    width: 400px;
    height: 400px;
    top: -100px;
    left: -100px;
}

.shape-2 {
    width: 300px;
    height: 300px;
    bottom: -50px;
    right: -50px;
}

.shape-3 {
    width: 200px;
    height: 200px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.download-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 3rem 1fr;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.download-card {
    background: #ffffff;
    border-radius: 1.5rem;
    padding: 3rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    -webkit-transition: all 250ms ease;
    transition: all 250ms ease;
}

.download-card:hover {
    -webkit-transform: translateY(-8px);
    transform: translateY(-8px);
}

.download-card-header {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--gray-100);
}

.platform-info h3 {
    margin-bottom: var(--space-xs);
}

.platform-info .version {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.download-requirements {
    margin-bottom: var(--space-xl);
}

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

.download-requirements svg {
    color: var(--success);
    flex-shrink: 0;
}

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

.btn-download {
    flex: 1;
    padding: 1rem;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    color: #ffffff;
    border-radius: 0.75rem;
    font-weight: 600;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    gap: 0.5rem;
    -webkit-transition: all 250ms ease;
    transition: all 250ms ease;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.btn-download.btn-ios {
    background: var(--gray-900);
}

.btn-download.btn-ios:hover {
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.btn-store,
.btn-testflight {
    flex: 1;
    padding: var(--space-md);
    background: var(--gray-100);
    color: var(--gray-700);
    border-radius: var(--radius-lg);
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    transition: all var(--transition-base);
}

.btn-store:hover,
.btn-testflight:hover {
    background: var(--gray-200);
}

.qr-section {
    text-align: center;
    padding: var(--space-xl);
    margin-top: var(--space-xl);
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
    border-radius: var(--radius-xl);
    border: 2px solid #e5e7eb;
    -webkit-transition: all 0.3s ease;
    transition: all 0.3s ease;
}

.qr-section:hover {
    -webkit-transform: translateY(-5px);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: #d1d5db;
}

.qr-section img {
    margin: 0 auto var(--space-md);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    background: #ffffff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.qr-section span {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
    display: block;
    margin-top: var(--space-sm);
}

/* ===================================
   About Section
   =================================== */
.about {
    padding: 6rem 0;
    background: #ffffff;
}

.about-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 6rem 1fr;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
}

.about-content .section-tag {
    margin-bottom: var(--space-lg);
}

.about-content h2 {
    margin-bottom: var(--space-xl);
}

.about-lead {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--space-lg);
    line-height: 1.8;
}

.about-content > p {
    color: var(--gray-500);
    margin-bottom: var(--space-xl);
    line-height: 1.8;
}

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

.about-list li {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    color: var(--gray-700);
    font-weight: 500;
}

.about-list svg {
    color: var(--success);
    flex-shrink: 0;
}

.about-stats-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 1.5rem 1fr;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.stat-card {
    background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 50%, #ddd6fe 100%);
    padding: 3rem;
    border-radius: 1.5rem;
    text-align: center;
    -webkit-transition: all 250ms ease;
    transition: all 250ms ease;
    border: 1px solid transparent;
}

.stat-card:hover {
    -webkit-transform: translateY(-5px);
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    border-color: #818cf8;
}

.stat-card .stat-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

.stat-card .stat-value,
.stat-card .stat-unit {
    display: inline;
    vertical-align: baseline;
}

.stat-card .stat-value {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 3rem;
    font-weight: 800;
    color: #6366f1;
}

.stat-card .stat-unit {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: #6366f1;
}

.stat-card .stat-desc {
    display: block;
    color: #52525b;
    margin-top: 0.5rem;
}

/* ===================================
   Testimonials Section
   =================================== */
.testimonials {
    padding: 6rem 0;
    background: #fafafa;
}

.testimonials-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 2rem 1fr 2rem 1fr;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.testimonial-card {
    background: #ffffff;
    padding: 3rem;
    border-radius: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    -webkit-transition: all 250ms ease;
    transition: all 250ms ease;
}

.testimonial-card:hover {
    -webkit-transform: translateY(-5px);
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

.testimonial-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.testimonial-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 700;
    font-size: 1.25rem;
}

.testimonial-info h4 {
    font-size: 1rem;
    margin-bottom: 2px;
}

.testimonial-info span {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.testimonial-rating {
    margin-left: auto;
    font-size: 0.875rem;
}

.testimonial-card p {
    color: var(--gray-600);
    line-height: 1.8;
    font-style: italic;
}

/* ===================================
   CTA Section
   =================================== */
.cta {
    position: relative;
    padding: 6rem 0;
    overflow: hidden;
    background: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 25%, #e0e7ff 50%, #ddd6fe 75%, #fce7f3 100%);
}

.cta-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.cta-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 25%, #e0e7ff 50%, #ddd6fe 75%, #fce7f3 100%);
}

.cta > .container {
    position: relative;
    z-index: 1;
}

.cta-decorations {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    pointer-events: none;
}

.cta-decoration {
    position: absolute;
    border-radius: 50%;
}

.cta-decoration-1 {
    width: 180px;
    height: 180px;
    top: 15%;
    left: 8%;
    background: linear-gradient(135deg, #93c5fd 0%, #c4b5fd 100%);
    opacity: 0.4;
    box-shadow: 0 15px 50px rgba(147, 197, 253, 0.3), inset 0 -8px 25px rgba(99, 102, 241, 0.1);
    -webkit-animation: float-decoration 10s ease-in-out infinite;
    animation: float-decoration 10s ease-in-out infinite;
}

.cta-decoration-2 {
    width: 150px;
    height: 150px;
    top: 50%;
    right: 10%;
    background: linear-gradient(135deg, #f9a8d4 0%, #fbcfe8 100%);
    opacity: 0.45;
    box-shadow: 0 12px 40px rgba(249, 168, 212, 0.3), inset 0 -6px 20px rgba(236, 72, 153, 0.1);
    -webkit-animation: float-decoration 12s ease-in-out infinite 1.5s;
    animation: float-decoration 12s ease-in-out infinite 1.5s;
}

.cta-decoration-3 {
    width: 130px;
    height: 130px;
    bottom: 20%;
    left: 50%;
    background: linear-gradient(135deg, #ddd6fe 0%, #e9d5ff 100%);
    opacity: 0.4;
    box-shadow: 0 10px 35px rgba(221, 214, 254, 0.3), inset 0 -5px 18px rgba(139, 92, 246, 0.1);
    -webkit-animation: float-decoration 11s ease-in-out infinite 0.8s;
    animation: float-decoration 11s ease-in-out infinite 0.8s;
}

.cta-content {
    text-align: center;
    color: #1e293b;
}

.cta-content h2 {
    color: #0f172a;
    margin-bottom: var(--space-md);
}

.cta-content p {
    font-size: 1.25rem;
    color: #475569;
    margin-bottom: var(--space-2xl);
}

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

/* ===================================
   Contact Section
   =================================== */
.contact {
    padding: 6rem 0;
    background: #ffffff;
}

.contact-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 6rem 1fr;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    -webkit-box-align: start;
    -ms-flex-align: start;
    align-items: start;
}

.contact-info .section-tag {
    margin-bottom: var(--space-lg);
}

.contact-info h2 {
    margin-bottom: var(--space-md);
}

.contact-info > p {
    color: var(--gray-500);
    margin-bottom: var(--space-2xl);
}

/* 联系插画 - 仅PC端显示 */
.contact-illustration {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.contact-illustration svg {
    width: 100%;
    height: auto;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 50%, #ddd6fe 100%);
    border-radius: 0.75rem;
    color: #6366f1;
    -ms-flex-negative: 0;
    flex-shrink: 0;
}

.contact-detail h4 {
    font-size: 1rem;
    margin-bottom: var(--space-xs);
}

.contact-detail a,
.contact-detail span {
    color: var(--gray-600);
}

.contact-detail a:hover {
    color: var(--primary);
}

/* Contact Form */
.contact-form {
    background: var(--gray-50);
    padding: var(--space-2xl);
    border-radius: var(--radius-2xl);
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

/* ===================================
   Footer
   =================================== */
.footer {
    background: #18181b;
    color: #ffffff;
    padding: 6rem 0 2rem;
}

.footer-grid {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1.5fr 6rem 2fr;
    grid-template-columns: 1.5fr 2fr;
    gap: 6rem;
    margin-bottom: 4rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: var(--space-lg);
}

.footer-logo img {
    width: 48px;
    height: 48px;
}

.footer-brand > p {
    color: var(--gray-400);
    margin-bottom: var(--space-xl);
    line-height: 1.8;
}

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-links a {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    color: var(--gray-400);
    transition: all var(--transition-base);
}

.social-links a:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-3px);
}

.footer-links {
    display: -ms-grid;
    display: grid;
    -ms-grid-columns: 1fr 2rem 1fr 2rem 1fr 2rem 1fr;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.footer-section h4 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: var(--space-lg);
}

.footer-section ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-section a {
    color: var(--gray-400);
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
}

.footer-section a:hover {
    color: var(--white);
    padding-left: var(--space-sm);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* ===================================
   Animations
   =================================== */
[data-aos="fade-up"] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos="fade-up"].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

[data-aos="fade-right"] {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos="fade-right"].aos-animate {
    opacity: 1;
    transform: translateX(0);
}

[data-aos="fade-left"] {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos="fade-left"].aos-animate {
    opacity: 1;
    transform: translateX(0);
}

[data-aos="zoom-in"] {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos="zoom-in"].aos-animate {
    opacity: 1;
    transform: scale(1);
}

[data-aos-delay="100"] { transition-delay: 100ms; }
[data-aos-delay="200"] { transition-delay: 200ms; }
[data-aos-delay="300"] { transition-delay: 300ms; }
[data-aos-delay="400"] { transition-delay: 400ms; }
[data-aos-delay="500"] { transition-delay: 500ms; }

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-buttons {
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        justify-content: center;
    }
    
    .hero-stats {
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .decoration-3,
    .decoration-4 {
        display: none;
    }
    
    .cta-decoration-2,
    .cta-decoration-3 {
        display: none;
    }
    
    .cta-content h2 {
        font-size: 1.75rem;
        line-height: 1.3;
        margin-bottom: 1rem;
    }
    
    .cta-content p {
        font-size: 0.875rem;
        line-height: 1.6;
        margin-bottom: 2rem;
        padding: 0 1rem;
    }
    
    .features-grid {
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
        -ms-flex-wrap: wrap;
        flex-wrap: wrap;
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        justify-content: center;
        gap: 1rem;
    }
    
    .feature-card {
        -webkit-box-flex: 0;
        -ms-flex: 0 1 calc(33.333% - 0.75rem);
        flex: 0 1 calc(33.333% - 0.75rem);
        min-width: 100px;
        padding: 1.5rem 0.75rem;
        text-align: center;
        background: rgba(255, 255, 255, 0.8);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border-radius: 1.25rem;
        border: 1px solid rgba(139, 92, 246, 0.1);
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    }
    
    .feature-card:hover {
        -webkit-transform: translateY(-4px);
        transform: translateY(-4px);
        box-shadow: 0 10px 15px -3px rgba(139, 92, 246, 0.2);
        border-color: rgba(139, 92, 246, 0.3);
    }
    
    .feature-card p {
        display: none;
    }
    
    .feature-icon-wrap {
        width: 72px;
        height: 72px;
        margin: 0 auto 0.875rem;
        border-radius: 18px;
        background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
        box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
        position: relative;
    }
    
    .feature-icon-wrap::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        border-radius: 18px;
        background: linear-gradient(135deg, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0) 100%);
        pointer-events: none;
    }
    
    .feature-icon-wrap svg {
        position: relative;
        z-index: 1;
        filter: brightness(0) invert(1);
        width: 40px;
        height: 40px;
    }
    
    .feature-card h3 {
        font-size: 0.875rem;
        margin-bottom: 0;
        color: #1e293b;
        font-weight: 600;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
    }
    
    .qr-section {
        display: none;
    }
    
    .btn-store,
    .btn-testflight {
        display: none;
    }
    
    .download-actions {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -ms-flex-direction: column;
        flex-direction: column;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    /* 移动端隐藏联系插画 */
    .contact-illustration {
        display: none;
    }
    
    /* 移动端联系信息间距调整 */
    .contact-info > p {
        margin-bottom: var(--space-lg);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links,
    .btn-nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero {
        position: relative;
        padding: 0;
        min-height: 100vh;
        height: 100vh;
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
        -webkit-box-align: center;
        -ms-flex-align: center;
        align-items: center;
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        justify-content: center;
    }
    
    .hero-content {
        max-width: 90%;
        text-align: center;
        position: static;
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -ms-flex-direction: column;
        flex-direction: column;
        -webkit-box-align: center;
        -ms-flex-align: center;
        align-items: center;
        padding-top: 0;
    }
    
    .hero-badge-desktop {
        display: none !important;
    }
    
    .hero-badge-mobile {
        display: -webkit-inline-box !important;
        display: -ms-inline-flexbox !important;
        display: inline-flex !important;
        position: absolute;
        top: 100px;
        left: 1.5rem;
        margin-bottom: 0;
    }
    
    .hero h1 {
        font-size: 2.5rem;
        line-height: 1.25;
        margin-bottom: 1rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        line-height: 1.55;
        margin-bottom: 0;
        opacity: 0.85;
        max-width: 100%;
    }
    
    .hero-buttons {
        -webkit-box-orient: horizontal;
        -webkit-box-direction: normal;
        -ms-flex-direction: row;
        flex-direction: row;
        -ms-flex-wrap: wrap;
        flex-wrap: wrap;
        gap: 0.75rem;
        margin-top: 7rem;
        margin-bottom: 0;
    }
    
    .hero-buttons .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }
    
    .hero-stats {
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
        -webkit-box-orient: horizontal;
        -webkit-box-direction: normal;
        -ms-flex-direction: row;
        flex-direction: row;
        -ms-flex-wrap: wrap;
        flex-wrap: wrap;
        gap: 1.5rem;
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        justify-content: center;
        margin-top: 2rem;
    }
    
    .stat-item {
        -webkit-box-flex: 1;
        -ms-flex: 1 1 auto;
        flex: 1 1 auto;
        min-width: 80px;
    }
    
    .stat-item .stat-number,
    .stat-item .stat-suffix {
        display: inline;
    }
    
    .stat-item .stat-number {
        font-size: 1.75rem;
    }
    
    .stat-item .stat-suffix {
        font-size: 1rem;
    }
    
    .stat-item .stat-label {
        display: block;
        font-size: 0.75rem;
    }
    
    .stat-divider {
        display: none;
    }
    
    .features-grid {
        gap: 0.75rem;
    }
    
    .feature-card {
        -webkit-box-flex: 0;
        -ms-flex: 0 1 calc(33.333% - 0.5rem);
        flex: 0 1 calc(33.333% - 0.5rem);
        min-width: 90px;
        padding: 1.25rem 0.5rem;
    }
    
    .feature-icon-wrap {
        width: 64px;
        height: 64px;
        margin: 0 auto 0.75rem;
        border-radius: 16px;
    }
    
    .feature-icon-wrap svg {
        width: 36px;
        height: 36px;
    }
    
    .feature-card h3 {
        font-size: 0.8rem;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .btn-store,
    .btn-testflight {
        display: none;
    }
    
    .download-actions {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -ms-flex-direction: column;
        flex-direction: column;
    }
    
    .about-stats-grid {
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
        -ms-flex-wrap: nowrap;
        flex-wrap: nowrap;
        gap: 0.75rem;
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        justify-content: center;
    }
    
    .stat-card {
        -webkit-box-flex: 1;
        -ms-flex: 1 1 calc(25% - 0.5625rem);
        flex: 1 1 calc(25% - 0.5625rem);
        min-width: 80px;
        padding: 1.25rem 0.5rem;
    }
    
    .stat-card .stat-icon {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
    }
    
    .stat-card .stat-value,
    .stat-card .stat-unit {
        display: inline;
        vertical-align: baseline;
    }
    
    .stat-card .stat-value {
        font-size: 1.5rem;
    }
    
    .stat-card .stat-unit {
        font-size: 0.875rem;
    }
    
    .stat-card .stat-desc {
        display: block;
        font-size: 0.7rem;
        margin-top: 0.25rem;
    }
    
    .footer-links {
        display: none;
    }
    
    .footer-bottom {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -ms-flex-direction: column;
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    
    .hero {
        position: relative;
        padding: 0;
        min-height: 100vh;
        height: 100vh;
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
        -webkit-box-align: center;
        -ms-flex-align: center;
        align-items: center;
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        justify-content: center;
    }
    
    .hero-content {
        max-width: 95%;
        text-align: center;
        position: static;
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -ms-flex-direction: column;
        flex-direction: column;
        -webkit-box-align: center;
        -ms-flex-align: center;
        align-items: center;
        padding-top: 0;
    }
    
    .hero-badge-desktop {
        display: none !important;
    }
    
    .hero-badge-mobile {
        display: -webkit-inline-box !important;
        display: -ms-inline-flexbox !important;
        display: inline-flex !important;
        position: absolute;
        top: 100px;
        left: 1rem;
        margin-bottom: 0;
        font-size: 0.7rem;
        padding: 0.35rem 0.75rem;
    }
    
    .hero h1 {
        font-size: 2rem;
        line-height: 1.3;
        margin-bottom: 0.75rem;
    }
    
    .hero-subtitle {
        font-size: 0.95rem;
        line-height: 1.5;
        margin-bottom: 0;
        opacity: 0.8;
        max-width: 100%;
    }
    
    .hero-buttons {
        margin-top: 7rem;
        margin-bottom: 0;
    }
    
    
    .hero-stats {
        gap: 1rem;
        margin-top: 1.5rem;
    }
    
    .stat-item .stat-number,
    .stat-item .stat-suffix {
        display: inline;
    }
    
    .stat-item .stat-number {
        font-size: 1.5rem;
    }
    
    .stat-item .stat-suffix {
        font-size: 0.875rem;
    }
    
    .stat-item .stat-label {
        display: block;
        font-size: 0.65rem;
    }
    
    .feature-card,
    .download-card,
    .testimonial-card,
    .contact-form {
        padding: 1.5rem;
    }
    
    .cta-content h2 {
        font-size: 1.5rem;
        line-height: 1.3;
    }
    
    .cta-content p {
        font-size: 0.8rem;
        line-height: 1.5;
        padding: 0 0.5rem;
    }
    
    .about-stats-grid {
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
        -ms-flex-wrap: nowrap;
        flex-wrap: nowrap;
        gap: 0.5rem;
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        justify-content: center;
    }
    
    .stat-card {
        -webkit-box-flex: 1;
        -ms-flex: 1 1 calc(25% - 0.375rem);
        flex: 1 1 calc(25% - 0.375rem);
        min-width: 70px;
        padding: 1rem 0.375rem;
    }
    
    .stat-card .stat-icon {
        font-size: 1.25rem;
        margin-bottom: 0.375rem;
    }
    
    .stat-card .stat-value,
    .stat-card .stat-unit {
        display: inline;
        vertical-align: baseline;
    }
    
    .stat-card .stat-value {
        font-size: 1.25rem;
    }
    
    .stat-card .stat-unit {
        font-size: 0.75rem;
    }
    
    .stat-card .stat-desc {
        display: block;
        font-size: 0.65rem;
        margin-top: 0.25rem;
    }
    
    .footer-links {
        display: none;
    }
}

/* ===================================
   Utilities
   =================================== */
.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;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

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

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

/* Selection */
::selection {
    background: var(--primary);
    color: var(--white);
}