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

:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --secondary-color: #10B981;
    --text-dark: #1F2937;
    --text-light: #6B7280;
    --bg-light: #F9FAFB;
    --border-color: #E5E7EB;
    --white: #FFFFFF;
}

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

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

.container.narrow {
    max-width: 800px;
}

/* Navigation */
.navbar {
    background: var(--white);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.logo a {
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

.cta-button {
    background: var(--primary-color);
    color: var(--white) !important;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: background 0.3s;
}

.cta-button:hover {
    background: var(--primary-hover);
}

/* Hero Section */
.hero {
    padding: 5rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
}

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

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.button {
    display: inline-block;
    padding: 0.875rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    text-align: center;
}

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

.button.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

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

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

.button.large {
    font-size: 1.125rem;
    padding: 1rem 2rem;
}

/* Hero Screenshot */
.hero-image {
    margin-top: 2rem;
}

.hero-screenshot {
    width: 100%;
    max-width: 800px;
    border-radius: 1rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

/* Features Section */
.features {
    padding: 5rem 0;
    background: linear-gradient(180deg, var(--white) 0%, var(--bg-light) 100%);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    max-width: 1100px;
    margin: 0 auto;
}

.feature-card {
    padding: 2.5rem 2rem;
    background: var(--white);
    border: 2px solid transparent;
    border-radius: 1rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

.feature-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 20px 40px rgba(79, 70, 229, 0.1);
    transform: translateY(-8px);
}

.feature-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 80px;
}

.feature-icon.chinese-icon {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}

.feature-icon svg {
    width: 80px;
    height: 80px;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.08));
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
    font-weight: 600;
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 1rem;
}

/* How It Works Section */
.how-it-works {
    padding: 5rem 0;
    background: var(--bg-light);
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto 4rem;
}

.step {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

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

/* Screenshots Showcase */
.screenshots-showcase {
    margin-top: 4rem;
}

.showcase-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.screenshot-item {
    background: var(--white);
    padding: 1rem;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.screenshot-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.screenshot-item img {
    width: 100%;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
}

.screenshot-caption {
    text-align: center;
    color: var(--text-dark);
    font-weight: 500;
}

/* Use Cases Section */
.use-cases {
    padding: 5rem 0;
    background: var(--white);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.use-case {
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
    text-align: center;
}

.use-case h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.use-case p {
    color: var(--text-light);
}

/* CTA Section */
.cta-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.footer-section p {
    color: #9CA3AF;
    line-height: 1.6;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #9CA3AF;
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #9CA3AF;
}

/* Privacy Page */
.privacy-content {
    padding: 4rem 0;
    background: var(--white);
}

.privacy-content h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.last-updated {
    color: var(--text-light);
    margin-bottom: 2rem;
    font-style: italic;
}

.policy-section {
    margin-bottom: 2.5rem;
}

.policy-section h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.policy-section h3 {
    font-size: 1.25rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-dark);
}

.policy-section p {
    margin-bottom: 1rem;
    color: var(--text-light);
    line-height: 1.8;
}

.policy-section ul {
    margin: 1rem 0 1rem 2rem;
    color: var(--text-light);
}

.policy-section ul li {
    margin-bottom: 0.5rem;
    line-height: 1.8;
}

.policy-section a {
    color: var(--primary-color);
    text-decoration: none;
}

.policy-section a:hover {
    text-decoration: underline;
}

.policy-section strong {
    color: var(--text-dark);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
        font-size: 0.875rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .step {
        flex-direction: column;
    }

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

    .hero-screenshot {
        margin-top: 2rem;
    }

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

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
    }

    .button {
        width: 100%;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}