/* ========================================
   CubreMedia - Design System & Styles
   ======================================== */

/* Design Tokens */
:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a24;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --border-color: rgba(255, 255, 255, 0.1);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

img, svg {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* Utility Classes */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-primary);
    padding: var(--space-xs) var(--space-md);
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-header .section-subtitle {
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    font-size: 0.9375rem;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

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

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

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.coming-soon-badge {
    font-size: 0.625rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.2rem 0.5rem;
    background: rgba(139, 92, 246, 0.2);
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: var(--radius-sm);
    color: var(--accent-secondary);
    margin-left: var(--space-sm);
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}

.header.scrolled {
    border-bottom-color: var(--border-color);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.25rem;
    font-weight: 600;
}

.logo-icon {
    width: 32px;
    height: 32px;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* Mobile Menu */
@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        justify-content: center;
        gap: var(--space-xl);
        transition: right var(--transition-base);
        border-left: 1px solid var(--border-color);
    }

    .nav.active {
        right: 0;
    }

    .nav-link {
        font-size: 1.25rem;
    }

    .mobile-menu-btn {
        display: flex;
        z-index: 1001;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-4xl) 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139, 92, 246, 0.1), transparent);
    pointer-events: none;
}

.hero-content {
    max-width: 700px;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    max-width: 550px;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

/* ========================================
   About Section
   ======================================== */
.about {
    padding: var(--space-4xl) 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
}

@media (min-width: 768px) {
    .about-content {
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.about-text p:last-child {
    margin-bottom: 0;
}

.about-text strong {
    color: var(--text-primary);
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.stat-card {
    text-align: center;
    padding: var(--space-xl);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.stat-number {
    display: block;
    font-family: var(--font-mono);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ========================================
   Podcast Section
   ======================================== */
.podcast {
    padding: var(--space-4xl) 0;
}

.podcast-platforms {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-3xl);
}

.platform-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.875rem 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-base);
}

.platform-btn svg {
    width: 20px;
    height: 20px;
}

.platform-btn:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.episodes {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    max-width: 700px;
    margin: 0 auto;
}

.episode-card {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.episode-card:hover {
    border-color: var(--accent-primary);
    transform: translateX(4px);
}

.episode-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
    padding: var(--space-xs) var(--space-sm);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.episode-info {
    flex: 1;
    min-width: 0;
}

.episode-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.episode-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.episode-duration {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

/* Play Button */
.play-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-base);
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.3);
}

.play-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.play-btn svg {
    width: 18px;
    height: 18px;
    color: white;
}

.play-btn .icon-play {
    margin-left: 2px;
}

.play-btn .icon-pause {
    display: none;
}

.episode-card.playing .play-btn .icon-play {
    display: none;
}

.episode-card.playing .play-btn .icon-pause {
    display: block;
}

/* Progress Bar */
.progress-bar {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    margin-top: var(--space-sm);
    overflow: hidden;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.episode-card.playing .progress-bar,
.episode-card.played .progress-bar {
    opacity: 1;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
    transition: width 0.1s linear;
}

/* ========================================
   Book Section
   ======================================== */
.book {
    padding: var(--space-4xl) 0;
    background: var(--bg-secondary);
}

.book-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

@media (min-width: 768px) {
    .book-content {
        grid-template-columns: 1fr 1.2fr;
    }
}

/* 3D Book Mockup */
.book-mockup {
    display: flex;
    justify-content: center;
    perspective: 1000px;
}

.book-3d {
    transform-style: preserve-3d;
    transform: rotateY(-15deg);
    transition: transform var(--transition-slow);
}

.book-mockup:hover .book-3d {
    transform: rotateY(-5deg);
}

.book-cover {
    position: relative;
    width: 220px;
    height: 320px;
    transform-style: preserve-3d;
}

.book-front {
    position: absolute;
    inset: 0;
    background: var(--accent-gradient);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    box-shadow:
        5px 5px 20px rgba(0, 0, 0, 0.3),
        inset 0 0 0 1px rgba(255, 255, 255, 0.1);
}

.book-spine {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 20px;
    background: linear-gradient(135deg, #4f46e5, #6366f1);
    transform: rotateY(-90deg) translateX(-10px);
    transform-origin: right;
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.book-label {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    opacity: 0.7;
    margin-bottom: auto;
}

.book-mock-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.book-mock-subtitle {
    font-size: 0.875rem;
    opacity: 0.8;
}

.book-decoration {
    position: absolute;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 40px;
    height: 40px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    transform: rotate(45deg);
}

/* Book Info */
.book-info .section-title {
    text-align: left;
}

.book-description {
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.book-features {
    margin-bottom: var(--space-xl);
}

.book-features li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
}

.book-features li:last-child {
    margin-bottom: 0;
}

.book-features svg {
    width: 20px;
    height: 20px;
    color: var(--accent-primary);
    flex-shrink: 0;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--space-3xl) 0 var(--space-xl);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: 2fr 1fr;
    }
}

.footer-brand .logo {
    margin-bottom: var(--space-md);
}

.footer-tagline {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: var(--space-3xl);
}

.footer-col h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.footer-col a {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 640px) {
    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

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

    .stat-card {
        padding: var(--space-lg);
    }

    .episode-card {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }

    .episode-duration {
        align-self: flex-start;
    }

    .book-cover {
        width: 180px;
        height: 260px;
    }

    .footer-links {
        gap: var(--space-2xl);
    }
}

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

.hero-content > * {
    animation: fadeInUp 0.6s ease-out forwards;
    opacity: 0;
}

.hero-content > *:nth-child(1) { animation-delay: 0.1s; }
.hero-content > *:nth-child(2) { animation-delay: 0.2s; }
.hero-content > *:nth-child(3) { animation-delay: 0.3s; }