/* WatchTab - Landing Page Styles */

:root {
    --primary-color: #007AFF;
    --primary-dark: #0056CC;
    --text-color: #1d1d1f;
    --text-secondary: #6e6e73;
    --bg-color: #ffffff;
    --bg-secondary: #f5f5f7;
    --border-color: #d2d2d7;
    --success-color: #34C759;
    --gradient-start: #007AFF;
    --gradient-end: #5856D6;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    text-decoration: none;
}

.logo img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

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

.lang-selector {
    position: relative;
}

.lang-selector select {
    appearance: none;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 2rem 0.5rem 1rem;
    font-size: 0.9rem;
    cursor: pointer;
}

.lang-selector::after {
    content: '▼';
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.6rem;
    color: var(--text-secondary);
    pointer-events: none;
}

/* Hero Section */
.hero {
    padding: 8rem 2rem 4rem;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-color) 100%);
}

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

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .tagline {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
}

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

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

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

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

.btn img {
    width: 24px;
    height: 24px;
}

.platform-badges {
    margin-top: 2rem;
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    background: var(--bg-secondary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Features Section */
.features {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
}

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

.feature-card {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 2rem;
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-secondary);
}

/* How It Works Section */
.how-it-works {
    padding: 6rem 2rem;
    background: var(--bg-secondary);
}

.how-it-works .container {
    max-width: 1000px;
    margin: 0 auto;
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

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

.step-number {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
}

.step-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

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

/* Use Cases Section */
.use-cases {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.use-case {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    text-align: center;
}

.use-case-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.use-case h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.use-case p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* CTA Section */
.cta {
    padding: 6rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
}

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

.cta p {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

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

.cta .btn-primary:hover {
    background: var(--bg-secondary);
}

/* Footer */
footer {
    padding: 3rem 2rem;
    background: var(--text-color);
    color: white;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.9rem;
}

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

.copyright {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero .tagline {
        font-size: 1.2rem;
    }

    .nav-links {
        gap: 1rem;
    }

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

    .step {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }

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

@media (max-width: 480px) {
    nav {
        padding: 1rem;
    }

    .hero {
        padding: 6rem 1rem 3rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
}

/* FAQ Section */
.faq {
    padding: 6rem 2rem;
    background: var(--bg-secondary);
}

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

.faq-container {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.faq-item {
    font-family: inherit;
    font-size: inherit;
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
    padding: 0;
    text-align: left;
    cursor: pointer;
    transition: background 0.2s ease-out;
    overflow: hidden;
}

.faq-item:first-child {
    border-top: 1px solid var(--border-color);
}

.faq-item:hover {
    background: rgba(0, 122, 255, 0.04);
}

.faq-item[aria-expanded="true"] {
    background: rgba(0, 122, 255, 0.04);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0.5rem;
    gap: 1rem;
}

.faq-question h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
}

.faq-icon {
    flex-shrink: 0;
    color: var(--text-secondary);
    transition: transform 0.2s ease-out;
    width: 20px;
    height: 20px;
}

.faq-item[aria-expanded="true"] .faq-icon {
    transform: rotate(180deg);
    color: var(--primary-color);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.faq-item[aria-expanded="true"] .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 0.5rem 1.25rem 0.5rem;
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .faq-item,
    .faq-icon,
    .faq-answer {
        transition: none;
    }
}

/* System Requirements Section */
.system-requirements {
    padding: 6rem 2rem;
    background: var(--bg-secondary);
}

.system-requirements .container {
    max-width: 1000px;
    margin: 0 auto;
}

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

.req-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    transition: all 0.3s ease-out;
    cursor: default;
}

.req-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.12);
}

.req-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.req-icon svg {
    color: white;
}

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

.req-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.req-card li {
    padding: 0.75rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 2rem;
    line-height: 1.6;
}

.req-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0.75rem;
    color: var(--success-color);
    font-weight: bold;
    font-size: 1.2rem;
}

@media (max-width: 768px) {
    .faq-question h3 {
        font-size: 1rem;
    }

    .faq-question {
        padding: 1.25rem;
    }

    .faq-answer p {
        padding: 0 1.25rem 1.25rem 1.25rem;
    }

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

    .req-card {
        padding: 2rem;
    }

    .req-icon {
        width: 56px;
        height: 56px;
    }
}