/* TalkBig 网站样式 */

/* 基础重置和变量 */
:root {
    --primary-color: #007AFF;
    --primary-gradient: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
    --secondary-color: #34C759;
    --accent-color: #FF9500;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --background: #FFFFFF;
    --surface: #F2F2F7;
    --border: #D1D1D6;
    --shadow: rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
    --max-width: 1200px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #F2F2F7;
        --text-secondary: #8E8E93;
        --background: #000000;
        --surface: #1C1C1E;
        --border: #38383A;
        --shadow: rgba(0, 0, 0, 0.3);
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
    overflow-x: hidden;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 20px;
    color: var(--primary-color);
}

.logo-img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width 0.3s ease;
}

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

.nav-mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.nav-mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* 按钮组件 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    font-size: 16px;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 122, 255, 0.4);
}

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

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

.btn-app-store img {
    height: 40px;
    width: auto;
}

/* 首页横幅 */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #F8F9FA 0%, #E3F2FD 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="grad1" cx="50%" cy="50%" r="50%"><stop offset="0%" style="stop-color:rgba(0,122,255,0.1);stop-opacity:1" /><stop offset="100%" style="stop-color:rgba(0,122,255,0);stop-opacity:0" /></radialGradient></defs><circle cx="200" cy="200" r="300" fill="url(%23grad1)"/><circle cx="800" cy="600" r="200" fill="url(%23grad1)"/></svg>') no-repeat center;
    background-size: cover;
    opacity: 0.5;
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
}

.highlight {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

/* 手机模型 */
.phone-mockup {
    position: relative;
    width: 300px;
    height: 600px;
    background: linear-gradient(145deg, #1D1D1F, #2C2C2E);
    border-radius: 30px;
    padding: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    margin: 0 auto;
}

.app-screenshot {
    width: 100%;
    height: 100%;
    border-radius: 22px;
    object-fit: cover;
}

.voice-waves {
    position: absolute;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 4px;
    align-items: end;
}

.wave {
    width: 4px;
    background: var(--primary-gradient);
    border-radius: 2px;
    animation: wave 1.5s ease-in-out infinite;
}

.wave:nth-child(1) { height: 20px; animation-delay: 0s; }
.wave:nth-child(2) { height: 35px; animation-delay: 0.1s; }
.wave:nth-child(3) { height: 45px; animation-delay: 0.2s; }
.wave:nth-child(4) { height: 25px; animation-delay: 0.3s; }

@keyframes wave {
    0%, 100% { transform: scaleY(0.3); }
    50% { transform: scaleY(1); }
}

/* 功能特性 */
.features {
    padding: 100px 0;
    background: var(--background);
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.feature-card {
    background: var(--surface);
    border-radius: var(--border-radius);
    padding: 40px 32px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-gradient);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 32px;
    color: white;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.feature-highlights {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.highlight-tag {
    background: rgba(0, 122, 255, 0.1);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

/* 产品演示 */
.demo {
    padding: 100px 0;
    background: var(--surface);
}

.demo-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.demo-steps {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.step {
    display: flex;
    gap: 20px;
    padding: 24px;
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.step.active {
    background: rgba(0, 122, 255, 0.05);
    border-color: var(--primary-color);
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--primary-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
}

.demo-phone {
    width: 300px;
    height: 600px;
    background: linear-gradient(145deg, #1D1D1F, #2C2C2E);
    border-radius: 30px;
    padding: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    margin: 0 auto;
    overflow: hidden;
}

.demo-img {
    width: 100%;
    height: 100%;
    border-radius: 22px;
    object-fit: cover;
    transition: var(--transition);
}

/* 使用场景 */
.scenarios {
    padding: 100px 0;
    background: var(--background);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.scenario-card {
    position: relative;
    height: 320px;
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.scenario-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow);
}

.scenario-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
}

.scenario-work {
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.8), rgba(88, 86, 214, 0.8)),
                url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><rect width="1000" height="1000" fill="%23f8f9fa"/></svg>');
}

.scenario-study {
    background: linear-gradient(135deg, rgba(88, 86, 214, 0.8), rgba(175, 82, 222, 0.8)),
                url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><rect width="1000" height="1000" fill="%23f8f9fa"/></svg>');
}

.scenario-life {
    background: linear-gradient(135deg, rgba(52, 199, 89, 0.8), rgba(48, 176, 199, 0.8)),
                url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><rect width="1000" height="1000" fill="%23f8f9fa"/></svg>');
}

.scenario-create {
    background: linear-gradient(135deg, rgba(255, 149, 0, 0.8), rgba(255, 59, 48, 0.8)),
                url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><rect width="1000" height="1000" fill="%23f8f9fa"/></svg>');
}

.scenario-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 32px;
    color: white;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
}

.scenario-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.scenario-content p {
    margin-bottom: 20px;
    opacity: 0.9;
}

.scenario-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    background: rgba(255, 255, 255, 0.2);
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 0.875rem;
    backdrop-filter: blur(10px);
}

/* 数据统计 */
.stats {
    padding: 80px 0;
    background: var(--surface);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}

/* 下载区域 */
.download {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.download-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.download-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 40px;
}

.download-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 40px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.feature-item i {
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-preview {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* 页脚 */
.footer {
    background: var(--text-primary);
    color: var(--background);
    padding: 60px 0 30px;
}

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

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-logo {
    width: 48px;
    height: 48px;
    border-radius: 12px;
}

.footer-tagline {
    opacity: 0.8;
    font-size: 1.125rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.link-group h4 {
    margin-bottom: 20px;
    font-weight: 600;
}

.link-group a {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    margin-bottom: 12px;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 30px;
    text-align: center;
    opacity: 0.6;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-mobile-toggle {
        display: flex;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .demo-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .download-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .phone-mockup {
        width: 250px;
        height: 500px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .features,
    .demo,
    .scenarios,
    .download {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .features-grid,
    .scenarios-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 图标字体 */
.icon-microphone::before { content: "🎤"; }
.icon-tags::before { content: "🏷️"; }
.icon-chart::before { content: "📊"; }
.icon-notes::before { content: "📝"; }
.icon-download::before { content: "⬇️"; }
.icon-play::before { content: "▶️"; }
.icon-check::before { content: "✓"; }

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 滚动动画 */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}