/* 基础样式重置 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --primary-light: #764ba2;
    --secondary-color: #4ECDC4;
    --accent-color: #FF6B6B;
    --text-dark: #1a202c;
    --text-medium: #4a5568;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --bg-white: #ffffff;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #4ECDC4 0%, #44a08d 100%);
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
}

html {
    scroll-behavior: smooth;
}

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

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

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

.nav-brand .logo {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    object-fit: cover;
}

.nav-brand .brand-name {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-medium);
    font-weight: 500;
    font-size: 16px;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

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

.nav-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-dark);
}

/* Hero区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 100px 0 50px;
    overflow: hidden;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
}

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

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
}

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

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--secondary-color);
    bottom: -100px;
    left: -100px;
    animation: float 10s ease-in-out infinite reverse;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: var(--accent-color);
    top: 50%;
    left: 30%;
    animation: float 12s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.1); }
}

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

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

.hero-text {
    max-width: 600px;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 50px;
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 56px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--text-dark);
}

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

.hero-subtitle {
    font-size: 20px;
    color: var(--text-medium);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
}

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

.stat-number {
    font-size: 32px;
    font-weight: 800;
    color: var(--primary-color);
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
    background: white;
    color: var(--text-dark);
    border: 2px solid #e2e8f0;
}

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

/* 手机模型 */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    width: 300px;
    height: 600px;
    background: #1a1a1a;
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-xl);
    transform: perspective(1000px) rotateY(-15deg) rotateX(5deg);
    transition: transform 0.3s ease;
}

.phone-mockup:hover {
    transform: perspective(1000px) rotateY(-10deg) rotateX(3deg) translateY(-10px);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 30px;
    overflow: hidden;
}

.screen-content {
    padding: 20px;
}

.app-header {
    text-align: center;
    padding: 10px 0;
    font-weight: 600;
    color: var(--text-dark);
    border-bottom: 1px solid #eee;
    margin-bottom: 20px;
}

.score-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 30px;
    color: white;
}

.score-circle .score {
    font-size: 48px;
    font-weight: 800;
}

.score-circle .label {
    font-size: 14px;
    opacity: 0.9;
}

.ability-bars {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.bar-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.bar-item span {
    font-size: 14px;
    color: var(--text-medium);
    width: 80px;
}

.bar {
    flex: 1;
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
}

.bar div {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-light);
    font-size: 14px;
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-light);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--text-light);
    border-radius: 2px;
    animation: scroll 1.5s ease-in-out infinite;
}

@keyframes scroll {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(10px); opacity: 0; }
}

/* 通用区域样式 */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-light);
}

/* 功能特色 */
.features {
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 36px;
    color: white;
}

.feature-card:nth-child(2) .feature-icon {
    background: var(--gradient-secondary);
}

.feature-card:nth-child(3) .feature-icon {
    background: linear-gradient(135deg, #FF6B6B 0%, #ee5a5a 100%);
}

.feature-card:nth-child(4) .feature-icon {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.feature-card:nth-child(5) .feature-icon {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.feature-card:nth-child(6) .feature-icon {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.feature-card p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
}

/* 如何使用 */
.steps-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.step-item {
    flex: 1;
    min-width: 200px;
    max-width: 250px;
    text-align: center;
    position: relative;
}

.step-number {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 72px;
    font-weight: 900;
    color: rgba(102, 126, 234, 0.1);
    z-index: 0;
}

.step-content {
    position: relative;
    z-index: 1;
    background: white;
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.step-content:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.step-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 28px;
    color: white;
}

.step-content h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.step-content p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

.step-arrow {
    font-size: 24px;
    color: var(--primary-color);
    opacity: 0.5;
}

/* 应用截图 */
.screenshots {
    background: var(--bg-light);
}

.screenshots-slider {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

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

.phone-frame {
    width: 220px;
    height: 440px;
    background: #1a1a1a;
    border-radius: 30px;
    padding: 10px;
    margin: 0 auto 20px;
    box-shadow: var(--shadow-lg);
}

.screen-mockup {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 22px;
    overflow: hidden;
    padding: 15px;
}

.mockup-header {
    text-align: center;
    font-weight: 600;
    padding: 10px 0;
    border-bottom: 1px solid #eee;
    margin-bottom: 15px;
    font-size: 14px;
}

.home-screen .search-bar {
    background: #f5f5f5;
    padding: 10px 15px;
    border-radius: 20px;
    font-size: 12px;
    color: #999;
    margin-bottom: 15px;
}

.grade-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    overflow-x: auto;
}

.grade-tabs span {
    padding: 6px 12px;
    background: #f5f5f5;
    border-radius: 15px;
    font-size: 12px;
    white-space: nowrap;
}

.grade-tabs span.active {
    background: var(--gradient-primary);
    color: white;
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.feature-box {
    background: var(--gradient-primary);
    color: white;
    padding: 20px 10px;
    border-radius: 10px;
    font-size: 12px;
    text-align: center;
}

.diagnosis-screen .progress-bar {
    height: 6px;
    background: #e0e0e0;
    border-radius: 3px;
    margin-bottom: 20px;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 3px;
}

.question-box {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
}

.question-tag {
    display: inline-block;
    padding: 4px 10px;
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
    border-radius: 10px;
    font-size: 11px;
    margin-bottom: 10px;
}

.question-box p {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 15px;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.option {
    padding: 10px;
    background: white;
    border-radius: 8px;
    font-size: 13px;
    border: 1px solid #e0e0e0;
}

.option.selected {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

.report-screen .score-display {
    text-align: center;
    padding: 30px 0;
}

.big-score {
    font-size: 64px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.score-label {
    font-size: 18px;
    color: var(--primary-color);
    font-weight: 600;
}

.stats-row {
    display: flex;
    justify-content: space-around;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 12px;
    font-size: 13px;
}

.vip-card {
    background: var(--gradient-primary);
    color: white;
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    margin-bottom: 20px;
}

.vip-title {
    font-size: 16px;
    margin-bottom: 10px;
}

.vip-price {
    font-size: 36px;
    font-weight: 800;
}

.vip-price span {
    font-size: 16px;
    font-weight: 400;
}

.benefits-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.benefit-item {
    font-size: 13px;
    color: var(--text-medium);
}

.screenshot-label {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
}

/* 用户评价 */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.testimonial-card {
    background: white;
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.testimonial-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.stars {
    color: #ffc107;
    margin-bottom: 20px;
    font-size: 16px;
}

.testimonial-text {
    font-size: 16px;
    color: var(--text-medium);
    line-height: 1.8;
    margin-bottom: 30px;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.author-avatar {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    font-weight: 600;
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-info .name {
    font-weight: 600;
    color: var(--text-dark);
}

.author-info .title {
    font-size: 14px;
    color: var(--text-light);
}

/* 下载区域 */
.download {
    background: var(--gradient-primary);
    color: white;
    padding: 80px 0;
}

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

.download-text h2 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 16px;
}

.download-text p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 40px;
}

.download-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 30px;
    background: white;
    color: var(--text-dark);
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.download-btn i {
    font-size: 32px;
}

.download-btn.android i {
    color: #3ddc84;
}

.btn-text {
    display: flex;
    flex-direction: column;
}

.btn-text .small {
    font-size: 12px;
    color: var(--text-light);
}

.btn-text .big {
    font-size: 18px;
    font-weight: 700;
}

.qr-code {
    display: flex;
    align-items: center;
    gap: 15px;
}

.qr-placeholder {
    width: 100px;
    height: 100px;
    background: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: var(--text-light);
}

.download-image {
    display: flex;
    justify-content: center;
}

.app-logo {
    width: 250px;
    height: 250px;
    border-radius: 50px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

/* 页脚 */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 60px;
    margin-bottom: 60px;
}

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

.footer-logo {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    margin-bottom: 16px;
}

.footer-brand-name {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 15px;
    color: rgba(255,255,255,0.7);
    line-height: 1.7;
    margin-bottom: 24px;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    width: 44px;
    height: 44px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    transition: all 0.3s ease;
}

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

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

.link-group h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 24px;
}

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

.link-group li {
    margin-bottom: 12px;
}

.link-group a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    color: rgba(255,255,255,0.5);
    font-size: 14px;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text {
        max-width: 100%;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-image {
        display: none;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .screenshots-slider {
        grid-template-columns: repeat(2, 1fr);
    }

    .download-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .download-buttons {
        justify-content: center;
    }

    .qr-code {
        justify-content: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 20px;
        box-shadow: var(--shadow-md);
        transform: translateY(-150%);
        transition: transform 0.3s ease;
    }

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

    .nav-toggle {
        display: block;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .section-title {
        font-size: 32px;
    }

    .features-grid,
    .testimonials-grid,
    .screenshots-slider {
        grid-template-columns: 1fr;
    }

    .steps-container {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

    .download-buttons {
        flex-direction: column;
    }

    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

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

.feature-card,
.step-content,
.testimonial-card {
    animation: fadeInUp 0.6s ease forwards;
}

/* 滚动显示动画 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}