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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #1e293b;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-light: #94a3b8;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* 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(12px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
    border-bottom-color: var(--border-color);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo-text {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 36px;
}

.nav-menu a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 8px 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-normal);
}

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

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

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-normal);
    border-radius: 2px;
}

/* Hero Section */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 50%, #f0f9ff 100%);
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

.hero-background::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 60%;
    height: 100%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.06) 0%, transparent 70%);
    animation: float 15s ease-in-out infinite reverse;
}

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

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    padding: 60px 0;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 3.75rem);
    font-weight: 700;
    line-height: 1.15;
    color: var(--text-primary);
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.highlight {
    background: linear-gradient(135deg, var(--primary-color) 0%, #7c3aed 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 520px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-lg {
    padding: 16px 40px;
    font-size: 17px;
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

.btn-download {
    background: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
    width: 100%;
    padding: 14px 24px;
}

.btn-download:hover {
    background: var(--text-primary);
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 32px;
    padding: 24px 32px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: fit-content;
}

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

.stat-number {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.stat-label {
    display: block;
    font-size: 13px;
    color: var(--text-light);
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 48px;
    background: var(--border-color);
}

/* Phone Mockup */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    position: relative;
    width: 300px;
    animation: phoneFloat 6s ease-in-out infinite;
}

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

.phone-screen {
    background: white;
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-xl), 0 0 0 8px rgba(0, 0, 0, 0.05);
    border: 3px solid #e5e7eb;
}

.app-preview {
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
    border-radius: 32px;
    overflow: hidden;
}

.app-header {
    padding: 20px;
    text-align: center;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    border-bottom: 1px solid var(--border-color);
}

.app-content {
    padding: 40px 24px;
    text-align: center;
}

.score-display {
    margin-bottom: 32px;
}

.score-circle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, #7c3aed 100%);
    color: white;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.3);
}

.score-value {
    font-size: 56px;
    font-weight: 700;
    line-height: 1;
}

.score-total {
    font-size: 18px;
    opacity: 0.9;
}

.quick-stats {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.mini-stat {
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
}

.mini-stat.correct {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.mini-stat.wrong {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
}

.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-light);
    font-size: 13px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* Features Section */
.features-section {
    padding: 120px 0;
    background: var(--bg-primary);
}

.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 64px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 32px;
}

.feature-card {
    background: white;
    padding: 40px 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

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

.feature-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(124, 58, 237, 0.08) 100%);
    border-radius: var(--radius-md);
    color: var(--primary-color);
    margin-bottom: 24px;
    transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, var(--primary-color) 0%, #7c3aed 100%);
    color: white;
    transform: scale(1.05);
}

.feature-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

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

/* Values Section */
.values-section {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.value-card {
    position: relative;
    background: white;
    padding: 48px 40px;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-normal);
    overflow: hidden;
}

.value-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.02) 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.value-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

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

.value-number {
    font-size: 64px;
    font-weight: 800;
    color: rgba(37, 99, 235, 0.08);
    line-height: 1;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

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

.value-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

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

.value-icon {
    position: absolute;
    bottom: 24px;
    right: 24px;
    color: rgba(37, 99, 235, 0.08);
    transition: all var(--transition-normal);
}

.value-card:hover .value-icon {
    color: rgba(37, 99, 235, 0.15);
    transform: scale(1.1);
}

/* Showcase Section */
.showcase-section {
    padding: 120px 0;
    background: var(--bg-primary);
}

.showcase-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    margin-bottom: 60px;
    perspective: 1000px;
}

.showcase-phone {
    flex: 1;
    max-width: 280px;
    transition: all var(--transition-slow);
}

.showcase-phone:hover {
    transform: translateY(-12px) scale(1.02);
}

.phone-center {
    transform: scale(1.1);
    z-index: 2;
}

.phone-center:hover {
    transform: scale(1.13) translateY(-12px);
}

.phone-frame {
    background: #1a1a2e;
    border-radius: 36px;
    padding: 12px;
    box-shadow: var(--shadow-xl);
    position: relative;
}

.phone-notch {
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 28px;
    background: #1a1a2e;
    border-radius: 0 0 16px 16px;
    z-index: 10;
}

.screen-content {
    background: white;
    border-radius: 28px;
    overflow: hidden;
    min-height: 500px;
}

.screen-header {
    padding: 44px 20px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.screen-body {
    padding: 20px;
}

.list-item {
    display: flex;
    align-items: center;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.list-item:hover {
    background: rgba(37, 99, 235, 0.05);
}

.list-item.active {
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid var(--primary-light);
}

.item-year {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-color);
    margin-right: 12px;
    min-width: 40px;
}

.item-name {
    flex: 1;
    font-size: 15px;
    font-weight: 500;
}

.item-arrow {
    font-size: 20px;
    color: var(--text-light);
}

.search-bar {
    margin-top: 20px;
    padding: 14px 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-light);
}

.question-nav {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.q-nav-item {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.q-nav-item.done {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.q-nav-item.current {
    background: var(--primary-color);
    color: white;
}

.answer-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.option {
    padding: 20px;
    text-align: center;
    font-size: 20px;
    font-weight: 600;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.option:hover {
    border-color: var(--primary-light);
}

.option.selected {
    background: rgba(37, 99, 235, 0.1);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.result-score {
    text-align: center;
    margin-bottom: 32px;
}

.result-number {
    font-size: 72px;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
}

.result-max {
    font-size: 24px;
    color: var(--text-light);
    margin-left: 4px;
}

.result-bars {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.bar-row {
    display: grid;
    grid-template-columns: 80px 1fr 40px;
    align-items: center;
    gap: 12px;
}

.bar-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.bar-track {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, #7c3aed 100%);
    border-radius: 4px;
    transition: width 1s ease;
}

.bar-val {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-color);
    text-align: right;
}

.showcase-features {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.showcase-feature {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
}

.check-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border-radius: 50%;
    font-size: 14px;
    font-weight: 700;
}

/* Download Section */
.download-section {
    padding: 120px 0;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: white;
}

.download-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.download-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.download-subtitle {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 56px;
}

.download-platforms {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-bottom: 40px;
}

.platform-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    transition: all var(--transition-normal);
}

.platform-card:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.platform-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    border-radius: var(--radius-md);
}

.ios-icon {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.2) 0%, rgba(147, 51, 234, 0.2) 100%);
    color: #60a5fa;
}

.android-icon {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2) 0%, rgba(5, 150, 105, 0.2) 100%);
    color: #34d399;
}

.platform-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
}

.platform-card p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 24px;
}

.qr-placeholder {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.qr-code {
    display: inline-block;
    padding: 12px;
    background: white;
    border-radius: var(--radius-md);
    margin-bottom: 8px;
}

.qr-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

.download-note {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
}

.download-note p {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* About Section */
.about-section {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 80px;
    align-items: start;
}

.about-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.about-text {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.about-values {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.about-value-item {
    display: flex;
    gap: 16px;
    padding: 20px 24px;
    background: white;
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-color);
}

.about-value-item strong {
    font-size: 15px;
    color: var(--primary-color);
    min-width: 56px;
}

.about-value-item span {
    font-size: 15px;
    color: var(--text-secondary);
}

.contact-info {
    background: white;
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 96px;
}

.contact-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 28px;
    color: var(--text-primary);
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 32px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: center;
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(124, 58, 237, 0.08) 100%);
    border-radius: var(--radius-md);
    color: var(--primary-color);
    flex-shrink: 0;
}

.contact-label {
    display: block;
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 2px;
}

.contact-value {
    display: block;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
}

.feedback-cta {
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.feedback-cta p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

/* Footer */
.footer {
    background: var(--secondary-color);
    color: white;
    padding: 48px 0 24px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-brand .logo-text {
    font-size: 24px;
    color: white;
    display: block;
    margin-bottom: 8px;
}

.footer-tagline {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-copyright {
    width: 100%;
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 24px;
}

.footer-copyright p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

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

    .hero-stats {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-visual {
        order: -1;
    }

    .phone-mockup {
        width: 260px;
    }

    .values-grid {
        grid-template-columns: 1fr;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .contact-info {
        position: static;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        align-items: center;
        padding: 32px;
        gap: 24px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-120%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

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

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

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

    .hero-section {
        padding-top: 100px;
        min-height: auto;
    }

    .hero-title {
        font-size: 2.25rem;
    }

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

    .stat-divider {
        width: 80%;
        height: 1px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .showcase-wrapper {
        flex-direction: column;
        gap: 32px;
    }

    .phone-center {
        transform: scale(1);
    }

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

    .download-platforms {
        grid-template-columns: 1fr;
    }

    .scroll-indicator {
        display: none;
    }

    .section-header {
        margin-bottom: 48px;
    }

    .features-section,
    .values-section,
    .showcase-section,
    .download-section,
    .about-section {
        padding: 80px 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn-lg {
        width: 100%;
    }

    .phone-mockup {
        width: 240px;
    }

    .score-circle {
        width: 140px;
        height: 140px;
    }

    .score-value {
        font-size: 48px;
    }

    .platform-card {
        padding: 32px 24px;
    }

    .feature-card {
        padding: 32px 24px;
    }

    .value-card {
        padding: 36px 28px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }

    .download-note {
        flex-direction: column;
        gap: 12px;
    }
}

/* 动画效果 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}