/* CSS Variables - 橙色系运动风格 */
:root {
    /* 主色调 - 活力橙 */
    --primary: #FF6B35;
    --primary-light: #FF8C42;
    --primary-dark: #E55A2B;
    --accent-orange: #FF9500;
    --accent-yellow: #FFB800;
    
    /* 背景色 - 深黑运动风 */
    --bg-primary: #0A0A0A;
    --bg-secondary: #141414;
    --bg-card: #1A1A1A;
    --bg-glass: rgba(255, 107, 53, 0.05);
    
    /* 文字色 */
    --text-primary: #FFFFFF;
    --text-secondary: #A0A0A0;
    --text-muted: #666666;
    
    /* 边框 */
    --border-color: rgba(255, 107, 53, 0.2);
    --border-light: rgba(255, 255, 255, 0.1);
    
    /* 渐变 */
    --gradient-1: linear-gradient(135deg, #FF6B35 0%, #FF8C42 50%, #FFB800 100%);
    --gradient-2: linear-gradient(90deg, #FF6B35 0%, #FF9500 100%);
    --gradient-3: linear-gradient(180deg, #FF6B35 0%, #E55A2B 100%);
    --gradient-dark: linear-gradient(180deg, #1A1A1A 0%, #0A0A0A 100%);
    
    /* 阴影 */
    --shadow-glow: 0 0 30px rgba(255, 107, 53, 0.4);
    --shadow-glow-lg: 0 0 60px rgba(255, 107, 53, 0.5);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    
    /* 圆角 - 运动风格更锐利 */
    --radius-sm: 4px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 斜切装饰元素 */
.slant-decoration {
    position: relative;
}

.slant-decoration::before {
    content: '';
    position: absolute;
    top: -50px;
    left: 0;
    right: 0;
    height: 100px;
    background: var(--bg-secondary);
    transform: skewY(-3deg);
    z-index: -1;
}

/* 橙色渐变文字 */
.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 按钮 - 运动风格 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 32px;
    border-radius: var(--radius);
    font-weight: 700;
    font-size: 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn svg {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-glow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

/* 导航 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 2px solid var(--border-color);
    padding: 16px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 22px;
    font-weight: 900;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 12px 20px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 8px;
    left: 20px;
    right: 20px;
    height: 2px;
    background: var(--primary);
    transform: scaleX(0);
    transition: transform 0.3s;
}

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

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

/* Hero 区域 - 运动风格 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 120px 0 80px;
    overflow: hidden;
    background: 
        radial-gradient(ellipse at 20% 80%, rgba(255, 107, 53, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(255, 184, 0, 0.1) 0%, transparent 50%),
        var(--bg-primary);
}

/* 动态速度线背景 */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 100px,
            rgba(255, 107, 53, 0.03) 100px,
            rgba(255, 107, 53, 0.03) 101px
        );
    animation: speedLines 20s linear infinite;
}

@keyframes speedLines {
    0% { transform: translateX(0); }
    100% { transform: translateX(100px); }
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

/* 运动徽章 */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    background: rgba(255, 107, 53, 0.15);
    border: 2px solid var(--border-color);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--primary);
    margin-bottom: 28px;
    width: fit-content;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(255, 107, 53, 0.4); }
    50% { box-shadow: 0 0 0 10px rgba(255, 107, 53, 0); }
}

.badge-icon {
    font-size: 18px;
}

.hero-title {
    font-size: clamp(42px, 6vw, 72px);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.03em;
    text-transform: uppercase;
}

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 520px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 56px;
    flex-wrap: wrap;
}

/* 手机模型 - 运动风格 */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-visual::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: var(--gradient-1);
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.1); opacity: 0.4; }
}

.phone-mockup {
    position: relative;
    transform: perspective(1000px) rotateY(-15deg) rotateX(5deg);
    transition: transform 0.5s ease;
}

.phone-mockup:hover {
    transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
}

.phone-frame {
    width: 280px;
    height: 560px;
    background: linear-gradient(145deg, #2A2A2A, #1A1A1A);
    border-radius: 32px;
    padding: 10px;
    box-shadow: 
        0 50px 100px -20px rgba(0, 0, 0, 0.8),
        0 30px 60px -30px rgba(0, 0, 0, 0.9),
        inset 0 0 0 2px rgba(255, 107, 53, 0.3),
        0 0 40px rgba(255, 107, 53, 0.2);
    position: relative;
}

.phone-frame::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 34px;
    padding: 2px;
    background: var(--gradient-1);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0.5;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    border-radius: 24px;
    overflow: hidden;
    position: relative;
}

.phone-image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

/* 运动统计数据 */
.hero-stats {
    display: flex;
    gap: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border-light);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.stat-number {
    font-size: 36px;
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

/* 区域样式 */
section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 72px;
}

.section-tag {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(255, 107, 53, 0.15);
    border: 2px solid var(--border-color);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary);
    margin-bottom: 20px;
}

.section-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 900;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    text-transform: uppercase;
}

.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 功能特色 - 运动卡片风格 */
.features {
    background: var(--bg-secondary);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: -50px;
    left: 0;
    right: 0;
    height: 100px;
    background: var(--bg-secondary);
    transform: skewY(-2deg);
    z-index: -1;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-color);
    box-shadow: var(--shadow-glow);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card.featured {
    grid-row: span 2;
    display: flex;
    flex-direction: column;
    background: linear-gradient(180deg, rgba(255,107,53,0.1) 0%, var(--bg-card) 100%);
    border-color: var(--border-color);
}

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    position: relative;
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    stroke: white;
    stroke-width: 2;
}

.bg-orange { background: linear-gradient(135deg, #FF6B35, #FF8C42); }
.bg-yellow { background: linear-gradient(135deg, #FFB800, #FF9500); }
.bg-red { background: linear-gradient(135deg, #EF4444, #F97316); }
.bg-green { background: linear-gradient(135deg, #22c55e, #16a34a); }
.bg-blue { background: linear-gradient(135deg, #3b82f6, #06b6d4); }
.bg-purple { background: linear-gradient(135deg, #a855f7, #6366f1); }

.feature-title {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

.feature-list {
    margin-top: auto;
    padding-top: 32px;
}

.feature-list li {
    padding: 10px 0;
    padding-left: 28px;
    position: relative;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.feature-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    color: white;
    font-weight: 900;
    content: "✓";
    text-align: center;
    line-height: 18px;
}

/* 使用方法 - 运动步骤 */
.how-it-works {
    background: var(--bg-primary);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.step {
    text-align: center;
    padding: 48px 32px;
    background: var(--bg-card);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    position: relative;
}

.step::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -32px;
    width: 32px;
    height: 2px;
    background: var(--gradient-2);
}

.step:last-child::after {
    display: none;
}

.step:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.step-number {
    font-size: 80px;
    font-weight: 900;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 24px;
    opacity: 0.9;
    font-family: 'Arial Black', sans-serif;
}

.step-content h3 {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

/* 下载区域 */
.download {
    background: 
        radial-gradient(ellipse at center, rgba(255, 107, 53, 0.1) 0%, transparent 70%),
        var(--bg-primary);
    padding: 160px 0;
}

.download-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 72px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-1);
}

.download-card::after {
    content: '';
    position: absolute;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    height: 200px;
    background: var(--primary);
    filter: blur(100px);
    opacity: 0.2;
}

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

.download-title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 900;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: -0.02em;
}

.download-desc {
    color: var(--text-secondary);
    margin-bottom: 48px;
    font-size: 18px;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 32px;
    border-radius: var(--radius);
    transition: var(--transition);
    min-width: 220px;
    position: relative;
    overflow: hidden;
}

.download-btn svg {
    width: 36px;
    height: 36px;
}

.download-btn.primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: var(--shadow-glow);
}

.download-btn.primary:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-glow-lg);
}

.download-btn.secondary {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--text-primary);
}

.download-btn.secondary:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-4px);
}

.download-btn .btn-small {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.8;
    font-weight: 600;
}

.download-btn .btn-large {
    display: block;
    font-size: 20px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.qr-code {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.qr-placeholder {
    width: 140px;
    height: 140px;
    background: white;
    border-radius: var(--radius);
    padding: 16px;
    color: var(--bg-primary);
    border: 4px solid var(--primary);
}

.qr-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.qr-placeholder svg {
    width: 100%;
    height: 100%;
}

.qr-code span {
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

/* 页脚 */
.footer {
    background: var(--bg-secondary);
    border-top: 2px solid var(--border-color);
    padding: 80px 0 32px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 64px;
    margin-bottom: 64px;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 900;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-logo svg {
    width: 40px;
    height: 40px;
    stroke: var(--primary);
    stroke-width: 2.5;
}

.footer-desc {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 800;
    margin-bottom: 24px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-col ul li {
    margin-bottom: 14px;
}

.footer-col ul li a {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.footer-col ul li a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s;
}

.footer-col ul li a:hover {
    color: var(--primary);
}

.footer-col ul li a:hover::after {
    width: 100%;
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border-light);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 48px;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .phone-mockup {
        transform: none;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .feature-card.featured {
        grid-row: span 1;
    }
    
    .steps {
        grid-template-columns: 1fr;
    }
    
    .step::after {
        display: none;
    }
    
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 8px;
        border-bottom: 2px solid var(--border-color);
        transform: translateY(-150%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .hero {
        padding: 140px 0 80px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 24px;
        align-items: center;
    }
    
    .stat-item {
        align-items: center;
    }
    
    .phone-frame {
        width: 260px;
        height: 520px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .download-card {
        padding: 48px 24px;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    section {
        padding: 80px 0;
    }
}

@media (max-width: 480px) {
    .btn {
        width: 100%;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .download-btn {
        min-width: 100%;
    }
}