/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

:root {
    --header-height: 70px;
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 600;
    color: #4A90E2;
}

.logo i {
    margin-right: 8px;
    color: #FF6B6B;
}

/* Logo image */
.logo-img {
    height: 20px;
    width: auto;
    margin-right: 8px;
    display: block;
    vertical-align: middle;
}

/* Ensure the anchor around the logo centers the image */
.logo a, .logo-link {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 24px;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    white-space: nowrap;
}

.nav-menu a:hover {
    color: #4A90E2;
}

.cta-button {
    background: linear-gradient(135deg, #4A90E2, #5BA3F5);
    color: white !important;
    padding: 10px 20px;
    border-radius: 25px;
    transition: all 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74, 144, 226, 0.3);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, #E8F4FD 0%, #F0F9FF 50%, #FFF8F0 100%);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: calc(var(--header-height) + 20px); /* 防止固定头部遮挡 */
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: #2C3E50;
}

.highlight {
    background: linear-gradient(135deg, #4A90E2, #FF6B6B);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 30px;
    line-height: 1.6;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #4A90E2, #5BA3F5);
    color: white;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(74, 144, 226, 0.4);
}

.btn-secondary {
    background: white;
    color: #4A90E2;
    border: 2px solid #4A90E2;
}

.btn-secondary:hover {
    background: #4A90E2;
    color: white;
    transform: translateY(-3px);
}

/* App Store badge */
.app-store-badge {
    display: inline-block;
    line-height: 0;
}
.app-store-badge img {
    height: 44px;
}

.hero-buttons .app-store-badge {
    margin-right: 8px;
}

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

/* Hero image styling */
.hero-photo {
    width: 100%;
    max-width: 420px;
    height: auto;
    border-radius: 28px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    transform: rotate(-3deg);
    transition: transform 0.3s ease;
}

.hero-photo:hover {
    transform: rotate(0deg) scale(1.03);
}

.hero-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
}

.hero-wave svg {
    position: relative;
    display: block;
    width: calc(100% + 1.3px);
    height: 120px;
    opacity: 0.6; /* 调高透明度（更透明） */
}

.hero-wave .shape-fill {
    fill: #FFFFFF;
}

/* Features Section */
.features {
    padding: 100px 0;
    background: white;
}

/* 修复跳转时被固定头部遮挡的问题 */
section {
    scroll-margin-top: calc(var(--header-height) + 20px);
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2C3E50;
    margin-bottom: 20px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #4A90E2, #5BA3F5);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2C3E50;
    margin-bottom: 15px;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* Benefits Section */
.benefits {
    padding: 100px 0;
    background: linear-gradient(135deg, #F8F9FA 0%, #E8F4FD 100%);
}

/* Screenshots Section */
.screenshots-section {
    padding: 100px 0;
    background: white;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.screenshot-item {
    text-align: center;
    padding: 20px;
    border-radius: 20px;
    background: #f8f9ff;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.screenshot-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.1);
}

.screenshot-img {
    width: 100%;
    max-width: 200px;
    height: auto;
    border-radius: 15px;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.screenshot-item h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.screenshot-item p {
    color: var(--gray-color);
    line-height: 1.6;
}

.benefits-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.benefit-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 30px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.benefit-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #FF6B6B, #FF8E8E);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.benefit-text h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #2C3E50;
    margin-bottom: 10px;
}

.benefit-text p {
    color: #666;
    line-height: 1.6;
}

/* FAQ Section */
.faq-section {
    padding: 100px 0;
    background: #f8f9ff;
}

.faq-content {
    max-width: 800px;
    margin: 60px auto 0;
}

.faq-item {
    background: white;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-2px);
}

.faq-item h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--dark-color);
    cursor: pointer;
    position: relative;
    padding-right: 30px;
}

.faq-item h3::after {
    content: '+';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.faq-item.active h3::after {
    transform: translateY(-50%) rotate(45deg);
}

.faq-answer {
    color: var(--gray-color);
    line-height: 1.6;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

/* How It Works Section */
.how-it-works {
    padding: 100px 0;
    background: linear-gradient(135deg, #F8F9FA 0%, #E8F4FD 100%);
    position: relative;
}

/* Decorative timeline line */
.steps-timeline {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: calc(50% + 40px);
    width: 70%;
    height: 4px;
    background: linear-gradient(90deg, rgba(74,144,226,0), rgba(74,144,226,0.3), rgba(74,144,226,0));
    border-radius: 2px;
    filter: blur(0.3px);
}

/* Steps grid */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    position: relative;
    z-index: 1;
}

/* Individual step card */
.step-card {
    list-style: none;
    background: white;
    border: 1px solid #eef2f7;
    box-shadow: 0 12px 30px rgba(74, 144, 226, 0.12);
    border-radius: 20px;
    padding: 28px 24px;
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-areas:
        "badge title"
        "icon desc"
        "progress progress";
    gap: 12px 16px;
    align-items: center;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    outline: none;
}

.step-card:focus-visible {
    box-shadow: 0 0 0 4px rgba(74, 144, 226, 0.35);
}

.step-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 40px rgba(74, 144, 226, 0.2);
}

/* Step badge */
.step-badge {
    grid-area: badge;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    background: linear-gradient(135deg, #4A90E2, #5BA3F5);
    box-shadow: 0 8px 20px rgba(74, 144, 226, 0.35);
}

/* Step icon */
.step-icon {
    grid-area: icon;
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #4A90E2;
    background: linear-gradient(135deg, rgba(74,144,226,0.08), rgba(91,163,245,0.08));
    box-shadow: inset 0 0 0 2px rgba(74,144,226,0.15);
    transition: transform 0.25s ease;
}

.step-card:hover .step-icon {
    transform: scale(1.06) rotate(-2deg);
}

/* Step content */
.step-content {
    grid-area: desc;
}

.step-title {
    grid-area: title;
    font-size: 1.25rem;
    font-weight: 700;
    color: #2C3E50;
    letter-spacing: 0.2px;
}

.step-desc {
    color: #566372;
    line-height: 1.6;
}

/* Progress indicator */
.step-progress {
    grid-area: progress;
    width: 100%;
    height: 6px;
    background: #f0f4f9;
    border-radius: 999px;
    overflow: hidden;
    margin-top: 8px;
}

.step-progress-fill {
    display: block;
    height: 100%;
    width: var(--progress);
    background: linear-gradient(135deg, #4A90E2, #5BA3F5);
    border-radius: 999px;
    box-shadow: 0 6px 14px rgba(74, 144, 226, 0.25);
    transition: width 0.8s ease;
}

/* Micro-interactions */
.step-card:hover .step-progress-fill {
    width: calc(var(--progress) + 4%);
}

/* Responsive */
@media (max-width: 992px) {
    .steps-grid {
        grid-template-columns: 1fr;
    }
    .steps-timeline {
        display: none;
    }
    .step-card {
        grid-template-columns: auto auto 1fr;
        grid-template-areas:
            "badge title title"
            "icon desc desc"
            "progress progress progress";
    }
}

.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
}

.cta-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.cta-text p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

/* 灰色小字提示：Android coming soon */
.cta-note {
    align-self: center;
    font-size: 0.8rem; /* 更小字体 */
    color: #6B7280; /* gray-500 */
}

.hero-buttons { align-items: flex-start; }
.cta-ios { display: flex; flex-direction: column; align-items: flex-start; }
.hero-buttons .cta-note { margin-left: 0; margin-top: 8px; }

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-outline:hover {
    background: white;
    color: #4A90E2;
}

.cta-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.8;
}

/* Footer */
.footer {
    background: #2C3E50;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a {
    color: #BDC3C7;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: #34495E;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: #4A90E2;
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #34495E;
    color: #BDC3C7;
}

/* Responsive Design */
@media (max-width: 992px) {
    :root { --header-height: 70px; }
    .nav-menu {
        display: none;
    }
    /* Show mobile nav when toggled */
    .nav-menu.active {
        display: flex;
        flex-direction: column;
        gap: 14px;
        position: fixed;
        top: var(--header-height);
        right: 16px;
        left: 16px;
        background: #fff;
        border: 1px solid #E5E7EB;
        border-radius: 12px;
        padding: 12px 16px;
        box-shadow: 0 12px 30px rgba(0,0,0,0.12);
        z-index: 1001;
    }
    .nav-menu.active a {
        color: #333;
        font-weight: 600;
        white-space: normal; /* allow wrapping in the dropdown */
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-photo {
        max-width: 320px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-content {
        grid-template-columns: 1fr;
    }
    
    .benefit-item {
        flex-direction: column;
        text-align: center;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-stats {
        gap: 30px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-photo {
        max-width: 260px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}

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

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

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Early Access Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    position: relative;
    background: #FFFFFF;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    max-width: 560px;
    width: 100%;
}

.modal-content {
    padding: 28px;
}

.modal-close {
    position: absolute;
    top: 10px;
    right: 12px;
    background: transparent;
    border: none;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    color: #7F8C8D;
}

.modal-content h3 {
    margin: 0 0 10px 0;
    font-size: 1.5rem;
}

.modal-content p {
    color: #4B5563;
    margin-bottom: 18px;
}

#early-access-form input[type="email"] {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #E5E7EB;
    border-radius: 10px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#early-access-form input[type="email"]:focus {
    border-color: #4A90E2;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.15);
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 16px;
}

.form-error {
    margin-top: 10px;
    color: #D35454;
    font-size: 0.95rem;
}

.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;
}

/* Use Cases Section */
.use-cases {
    padding: 100px 0;
    background: linear-gradient(135deg, #FFFFFF 0%, #F8F9FA 100%);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.use-case-item {
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
}

.use-case-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.use-case-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #4A90E2, #5BA3F5);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: white;
    font-size: 1.5rem;
}

.use-case-content h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: #2C3E50;
    margin-bottom: 15px;
}

.use-case-content p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 20px;
}

.use-case-example {
    background: #f8f9ff;
    padding: 15px;
    border-radius: 10px;
    border-left: 4px solid #4A90E2;
}

.example-label {
    font-weight: 600;
    color: #4A90E2;
    display: block;
    margin-bottom: 5px;
    font-size: 0.9rem;
}

.example-text {
    color: #555;
    font-style: italic;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Testimonials Section */
.testimonials {
    padding: 100px 0;
    background: linear-gradient(135deg, #F8F9FA 0%, #E8F4FD 100%);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.testimonial-item {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
}

.testimonial-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.testimonial-content {
    text-align: center;
}

.testimonial-rating {
    margin-bottom: 20px;
    color: #FFD700;
    font-size: 1.2rem;
}

.testimonial-text {
    font-size: 1.1rem;
    color: #333;
    line-height: 1.7;
    margin-bottom: 25px;
    font-style: italic;
}

.testimonial-author strong {
    display: block;
    font-size: 1.1rem;
    color: #2C3E50;
    margin-bottom: 5px;
}

.testimonial-author span {
    color: #666;
    font-size: 0.95rem;
}

/* Responsive adjustments for new sections */
@media (max-width: 768px) {
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .use-case-item,
    .testimonial-item {
        padding: 25px 20px;
    }
}


/* Hero Privacy Strip */
.privacy-strip {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(26, 30, 36, 0.06);
  color: #1A1E24;
  font-size: 14px;
}
.privacy-strip i {
  color: #2ecc71; /* accent green */
}
.privacy-strip a {
  color: #1A73E8;
  text-decoration: none;
}
.privacy-strip a:hover {
  text-decoration: underline;
}

/* Dedicated Privacy Section */
.privacy-section {
  padding: 64px 0;
  background: #F7F9FC;
}
.privacy-section .section-header {
  text-align: center;
  margin-bottom: 24px;
}
.privacy-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 12px;
}
.privacy-item {
  background: #fff;
  border: 1px solid #e6e9ef;
  border-radius: 10px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.privacy-item i {
  color: #2ecc71;
}
.privacy-note {
  margin-top: 16px;
  text-align: center;
  font-size: 14px;
}

/* Footer privacy microcopy */
.footer-privacy-note {
  margin-top: 8px;
  font-size: 13px;
  color: #4b5563;
}

/* Responsive tweaks */
@media (max-width: 768px) {
  .privacy-list {
    grid-template-columns: 1fr;
  }
}

.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
}

.cta-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.cta-text p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

/* 灰色小字提示：Android coming soon */
.cta-note {
    align-self: center;
    font-size: 0.8rem; /* 更小字体 */
    color: #6B7280; /* gray-500 */
}

.hero-buttons { align-items: flex-start; }
.cta-ios { display: flex; flex-direction: column; align-items: flex-start; }
.hero-buttons .cta-note { margin-left: 0; margin-top: 8px; }

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-outline:hover {
    background: white;
    color: #4A90E2;
}

.cta-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.8;
}

/* Footer */
.footer {
    background: #2C3E50;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a {
    color: #BDC3C7;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: #34495E;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: #4A90E2;
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #34495E;
    color: #BDC3C7;
}

/* Responsive Design */
@media (max-width: 992px) {
    :root { --header-height: 70px; }
    .nav-menu {
        display: none;
    }
    /* Show mobile nav when toggled */
    .nav-menu.active {
        display: flex;
        flex-direction: column;
        gap: 14px;
        position: fixed;
        top: var(--header-height);
        right: 16px;
        left: 16px;
        background: #fff;
        border: 1px solid #E5E7EB;
        border-radius: 12px;
        padding: 12px 16px;
        box-shadow: 0 12px 30px rgba(0,0,0,0.12);
        z-index: 1001;
    }
    .nav-menu.active a {
        color: #333;
        font-weight: 600;
        white-space: normal; /* allow wrapping in the dropdown */
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-photo {
        max-width: 320px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-content {
        grid-template-columns: 1fr;
    }
    
    .benefit-item {
        flex-direction: column;
        text-align: center;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-stats {
        gap: 30px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-photo {
        max-width: 260px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}

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

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

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Early Access Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    position: relative;
    background: #FFFFFF;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    max-width: 560px;
    width: 100%;
}

.modal-content {
    padding: 28px;
}

.modal-close {
    position: absolute;
    top: 10px;
    right: 12px;
    background: transparent;
    border: none;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    color: #7F8C8D;
}

.modal-content h3 {
    margin: 0 0 10px 0;
    font-size: 1.5rem;
}

.modal-content p {
    color: #4B5563;
    margin-bottom: 18px;
}

#early-access-form input[type="email"] {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #E5E7EB;
    border-radius: 10px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#early-access-form input[type="email"]:focus {
    border-color: #4A90E2;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.15);
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 16px;
}

.form-error {
    margin-top: 10px;
    color: #D35454;
    font-size: 0.95rem;
}

.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;
}

/* Use Cases Section */
.use-cases {
    padding: 100px 0;
    background: linear-gradient(135deg, #FFFFFF 0%, #F8F9FA 100%);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.use-case-item {
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
}

.use-case-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.use-case-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #4A90E2, #5BA3F5);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: white;
    font-size: 1.5rem;
}

.use-case-content h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: #2C3E50;
    margin-bottom: 15px;
}

.use-case-content p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 20px;
}

.use-case-example {
    background: #f8f9ff;
    padding: 15px;
    border-radius: 10px;
    border-left: 4px solid #4A90E2;
}

.example-label {
    font-weight: 600;
    color: #4A90E2;
    display: block;
    margin-bottom: 5px;
    font-size: 0.9rem;
}

.example-text {
    color: #555;
    font-style: italic;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Testimonials Section */
.testimonials {
    padding: 100px 0;
    background: linear-gradient(135deg, #F8F9FA 0%, #E8F4FD 100%);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.testimonial-item {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
}

.testimonial-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.testimonial-content {
    text-align: center;
}

.testimonial-rating {
    margin-bottom: 20px;
    color: #FFD700;
    font-size: 1.2rem;
}

.testimonial-text {
    font-size: 1.1rem;
    color: #333;
    line-height: 1.7;
    margin-bottom: 25px;
    font-style: italic;
}

.testimonial-author strong {
    display: block;
    font-size: 1.1rem;
    color: #2C3E50;
    margin-bottom: 5px;
}

.testimonial-author span {
    color: #666;
    font-size: 0.95rem;
}

/* Responsive adjustments for new sections */
@media (max-width: 768px) {
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .use-case-item,
    .testimonial-item {
        padding: 25px 20px;
    }
}