/* Big Letters Website - Main Stylesheet
 * Clean, minimal design with light/dark mode
 * Mobile-first responsive design
 */

/* === CSS VARIABLES === */
:root {
    /* Light Mode (default) */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #eff6ff;
    --border: #e5e7eb;
    --card-shadow: rgba(0, 0, 0, 0.05);
    --card-shadow-hover: rgba(0, 0, 0, 0.1);
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-light: #1e3a5f;
    --border: #334155;
    --card-shadow: rgba(0, 0, 0, 0.3);
    --card-shadow-hover: rgba(0, 0, 0, 0.4);
}

/* Auto dark mode based on system preference */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;
        --text-muted: #64748b;
        --accent: #60a5fa;
        --accent-hover: #93c5fd;
        --accent-light: #1e3a5f;
        --border: #334155;
        --card-shadow: rgba(0, 0, 0, 0.3);
        --card-shadow-hover: rgba(0, 0, 0, 0.4);
    }
}

/* === BASE STYLES === */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
}

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-hover);
}

/* === LAYOUT === */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 4rem 0;
}

.section-alt {
    background-color: var(--bg-secondary);
}

/* === HEADER & NAVIGATION === */
.header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s ease;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-link {
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
    background-color: var(--accent-light);
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
    color: var(--accent);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

/* Mobile Navigation */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding-top: 1rem;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-link {
        padding: 0.75rem 1rem;
        border-bottom: 1px solid var(--border);
    }
}

/* === HERO SECTION === */
.hero {
    padding: 5rem 0 4rem;
    text-align: center;
}

.hero h1 {
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 2rem;
}

.hero-image {
    max-width: 100%;
    height: auto;
    border-radius: 16px;
    box-shadow: 0 20px 60px var(--card-shadow);
    margin: 2rem auto;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
}

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

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

.btn-secondary:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

/* App Store Badge */
.app-store-badge {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--text-primary);
    color: var(--bg-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.app-store-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--card-shadow-hover);
    color: var(--bg-primary);
}

.app-store-badge .badge-small {
    font-size: 0.7rem;
    opacity: 0.9;
}

.app-store-badge .badge-large {
    font-size: 1.2rem;
    font-weight: 700;
}

/* === FEATURES SECTION === */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--card-shadow-hover);
}

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

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

.feature-card p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* === USE CASES SECTION === */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.use-case-card {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.use-case-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.use-case-card h4 {
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.use-case-card p {
    margin-bottom: 0;
    font-size: 0.9rem;
}

/* === SCREENSHOTS GALLERY === */
.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.screenshot {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 24px var(--card-shadow);
    transition: transform 0.3s ease;
}

.screenshot:hover {
    transform: scale(1.02);
}

.screenshot img {
    width: 100%;
    height: auto;
    display: block;
}

/* === SECTION HEADERS === */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3rem;
}

.section-header h2 {
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.1rem;
}

/* === CTA SECTION === */
.cta-section {
    text-align: center;
    padding: 5rem 0;
    background-color: var(--bg-secondary);
}

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

.cta-section p {
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* === FOOTER === */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 3rem 0 2rem;
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

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

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* === BLOG STYLES === */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.blog-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--card-shadow-hover);
}

.blog-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.blog-card-content {
    padding: 1.5rem;
}

.blog-card-date {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.blog-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.blog-card h3 a {
    color: var(--text-primary);
}

.blog-card h3 a:hover {
    color: var(--accent);
}

.blog-card p {
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.read-more {
    font-weight: 600;
    color: var(--accent);
}

/* Blog Post */
.blog-post {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0 4rem;
}

.blog-post-header {
    margin-bottom: 2rem;
}

.blog-post-date {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.blog-post-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.blog-post-content h2 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.blog-post-content h3 {
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.blog-post-content ul,
.blog-post-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.blog-post-content li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.blog-post-content img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 2rem 0;
}

.blog-post-content blockquote {
    border-left: 4px solid var(--accent);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--text-secondary);
}

/* === LEGAL PAGES === */
.legal-page {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0 4rem;
}

.legal-page h1 {
    margin-bottom: 0.5rem;
}

.legal-page .last-updated {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.legal-page h2 {
    margin-top: 2.5rem;
    font-size: 1.5rem;
}

.legal-page h3 {
    margin-top: 1.5rem;
    font-size: 1.25rem;
}

.legal-page ul {
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.legal-page li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

/* === CONTACT PAGE === */
.contact-page {
    max-width: 600px;
    margin: 0 auto;
    padding: 3rem 0 4rem;
    text-align: center;
}

.contact-email {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent);
    display: inline-block;
    padding: 1rem 2rem;
    background-color: var(--accent-light);
    border-radius: 12px;
    margin: 1.5rem 0;
}

/* === UTILITIES === */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* === ANIMATIONS === */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .section {
        padding: 3rem 0;
    }
    
    .hero {
        padding: 3rem 0 2rem;
    }
    
    .features-grid,
    .use-cases-grid {
        gap: 1rem;
    }
    
    .feature-card,
    .use-case-card {
        padding: 1.5rem;
    }
    
    .footer-grid {
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
}

/* === COOKIE NOTICE === */
#cookie-notice {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 1.25rem 1.5rem;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    box-shadow: 0 -4px 12px var(--card-shadow);
    transition: transform 0.3s ease, opacity 0.3s ease;
    transform: translateY(100%);
    opacity: 0;
}

#cookie-notice.cookie-notice-show {
    transform: translateY(0);
    opacity: 1;
}

.cookie-notice-content {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.cookie-notice-text {
    color: var(--text-primary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.cookie-notice-text a {
    color: var(--accent);
    text-decoration: underline;
}

.cookie-notice-actions {
    display: flex;
    gap: 0.75rem;
    flex-shrink: 0;
}

.cookie-notice-btn {
    padding: 0.625rem 1.25rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.cookie-notice-btn-accept {
    background-color: var(--accent);
    color: #ffffff;
}

.cookie-notice-btn-accept:hover {
    background-color: var(--accent-hover);
}

.cookie-notice-btn-reject {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.cookie-notice-btn-reject:hover {
    background-color: var(--bg-primary);
}

@media (max-width: 768px) {
    #cookie-notice {
        flex-direction: column;
        align-items: stretch;
        padding: 1rem;
    }
    
    .cookie-notice-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    
    .cookie-notice-actions {
        width: 100%;
        flex-direction: column;
    }
    
    .cookie-notice-btn {
        width: 100%;
    }
}