/* ShelfStream - Apple-inspired Design */

:root {
    --color-primary: #007AFF;
    --color-primary-dark: #0056CC;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-background: #ffffff;
    --color-background-alt: #f5f5f7;
    --color-border: #d2d2d7;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --max-width: 980px;
    --transition: 0.3s ease;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-text: #f5f5f7;
        --color-text-secondary: #a1a1a6;
        --color-background: #000000;
        --color-background-alt: #1d1d1f;
        --color-border: #424245;
    }
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-family);
    font-size: 17px;
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
    text-decoration: underline;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.022em;
}

h1 {
    font-size: 56px;
    line-height: 1.07143;
    letter-spacing: -0.005em;
}

h2 {
    font-size: 48px;
    line-height: 1.08349;
    letter-spacing: -0.003em;
}

h3 {
    font-size: 28px;
    line-height: 1.14286;
}

h4 {
    font-size: 21px;
    line-height: 1.19048;
}

@media (max-width: 768px) {
    h1 {
        font-size: 32px;
        line-height: 1.125;
    }

    h2 {
        font-size: 28px;
        line-height: 1.14286;
    }

    h3 {
        font-size: 21px;
        line-height: 1.19048;
    }
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 22px;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
}

@media (prefers-color-scheme: dark) {
    .nav {
        background: rgba(29, 29, 31, 0.8);
    }
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 21px;
    font-weight: 600;
    color: var(--color-text);
}

.nav-logo img {
    width: 32px;
    height: 32px;
    border-radius: 7px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-size: 14px;
}

.nav-links a:hover {
    color: var(--color-text);
    text-decoration: none;
}

.lang-select {
    padding: 6px 12px;
    font-size: 14px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: transparent;
    color: var(--color-text);
    cursor: pointer;
}

/* Hero Section */
.hero {
    padding: 120px 0 60px;
    text-align: center;
    background: var(--color-background-alt);
}

.hero-eyebrow {
    font-size: 21px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.hero h1 {
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 28px;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
}

@media (max-width: 768px) {
    .hero-subtitle {
        font-size: 19px;
    }
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 17px;
    font-weight: 400;
    border-radius: 980px;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    text-decoration: none;
}

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

.btn-secondary:hover {
    background: var(--color-primary);
    color: #ffffff;
    text-decoration: none;
}

.hero-image {
    max-width: 800px;
    margin: 60px auto 0;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

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

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    margin-bottom: 16px;
}

.section-title p {
    font-size: 21px;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

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

@media (max-width: 768px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

.feature-card {
    text-align: center;
    padding: 40px 30px;
    background: var(--color-background-alt);
    border-radius: 20px;
    transition: transform var(--transition);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), #5856D6);
    border-radius: 16px;
    color: #ffffff;
    font-size: 28px;
}

.feature-card h3 {
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: 15px;
}

/* Screenshots Section */
.screenshots {
    padding: 100px 0;
    background: var(--color-background-alt);
    overflow: hidden;
}

.screenshot-gallery {
    display: flex;
    gap: 24px;
    overflow-x: auto;
    padding: 20px 0;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
}

.screenshot-gallery::-webkit-scrollbar {
    display: none;
}

.screenshot-item {
    flex: 0 0 280px;
    scroll-snap-align: center;
}

.screenshot-item img {
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.12);
}

/* Download Section */
.download {
    padding: 100px 0;
    text-align: center;
}

.download h2 {
    margin-bottom: 20px;
}

.download p {
    font-size: 21px;
    color: var(--color-text-secondary);
    margin-bottom: 40px;
}

.app-store-badge {
    height: 54px;
    transition: opacity var(--transition);
}

.app-store-badge:hover {
    opacity: 0.8;
}

/* Footer */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    background: var(--color-background-alt);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 14px;
}

.footer-links a:hover {
    color: var(--color-text);
}

.footer-copyright {
    color: var(--color-text-secondary);
    font-size: 14px;
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* Legal Pages */
.legal {
    padding: 100px 0 60px;
}

.legal h1 {
    font-size: 48px;
    margin-bottom: 16px;
}

.legal .last-updated {
    color: var(--color-text-secondary);
    margin-bottom: 40px;
}

.legal-content {
    max-width: 800px;
}

.legal-content h2 {
    font-size: 28px;
    margin: 48px 0 16px;
}

.legal-content h3 {
    font-size: 21px;
    margin: 32px 0 12px;
}

.legal-content p {
    margin-bottom: 16px;
    color: var(--color-text-secondary);
}

.legal-content ul, .legal-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.legal-content li {
    margin-bottom: 8px;
    color: var(--color-text-secondary);
}

.legal-content strong {
    color: var(--color-text);
}

/* Google Data Section (Privacy Policy) */
.google-data-notice {
    background: var(--color-background-alt);
    padding: 24px;
    border-radius: 12px;
    margin: 24px 0;
    border-left: 4px solid var(--color-primary);
}

.google-data-notice h3 {
    margin-top: 0 !important;
    color: var(--color-primary);
}

/* Language Selector in Legal Pages */
.legal-lang-selector {
    display: flex;
    gap: 8px;
    margin-bottom: 40px;
}

.legal-lang-selector a {
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    background: var(--color-background-alt);
    color: var(--color-text-secondary);
}

.legal-lang-selector a.active {
    background: var(--color-primary);
    color: #ffffff;
}

.legal-lang-selector a:hover {
    text-decoration: none;
}

/* Index (Language Select) Page */
.lang-select-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px 20px;
}

.lang-select-page h1 {
    margin-bottom: 40px;
}

.lang-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    max-width: 400px;
    width: 100%;
}

@media (max-width: 480px) {
    .lang-options {
        grid-template-columns: 1fr;
    }
}

.lang-option {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 20px;
    background: var(--color-background-alt);
    border-radius: 12px;
    color: var(--color-text);
    font-size: 17px;
    font-weight: 500;
    transition: all var(--transition);
}

.lang-option:hover {
    background: var(--color-primary);
    color: #ffffff;
    text-decoration: none;
    transform: translateY(-2px);
}

.lang-flag {
    font-size: 24px;
}

/* Utility */
.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: 40px;
}

.mb-4 {
    margin-bottom: 40px;
}