/* ===================================
   Font Declarations (Self-Hosted)
   =================================== */
@font-face {
    font-family: 'Inter';
    src: url('../fonts/inter.woff2') format('woff2');
    font-weight: 100 900;
    font-display: swap;
}

/* ===================================
   CSS Variables - Dark Theme
   =================================== */
:root {
    /* Colors - Dark Theme */
    --color-bg: #000000;
    --color-bg-secondary: #0A0A0A;
    --color-bg-tertiary: #141414;
    --color-primary: #10B981;
    --color-primary-dark: #059669;
    --color-accent: #34D399;
    --color-text: #FFFFFF;
    --color-text-secondary: #A0A0A0;
    --color-text-tertiary: #666666;
    --color-border: #1F1F1F;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Borders & Shadows */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.3);
    --shadow-glow-strong: 0 0 40px rgba(16, 185, 129, 0.5);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Light Theme */
[data-theme="light"] {
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F0FDF4;
    --color-bg-tertiary: #DCFCE7;
    --color-primary: #10B981;
    --color-primary-dark: #059669;
    --color-accent: #34D399;
    --color-text: #111827;
    --color-text-secondary: #6B7280;
    --color-text-tertiary: #9CA3AF;
    --color-border: #D1FAE5;
    --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.2);
    --shadow-glow-strong: 0 0 40px rgba(16, 185, 129, 0.3);
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

/* ===================================
   Navigation
   =================================== */
.navbar-dark {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

/* Light theme navbar */
[data-theme="light"] .navbar-dark {
    background: rgba(240, 253, 244, 0.95);
}

.nav-container-dark {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand-dark {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.125rem;
    font-weight: 700;
}

.logo-icon {
    filter: drop-shadow(0 0 8px rgba(16, 185, 129, 0.5));
}

.nav-links-dark {
    display: flex;
    gap: 2.5rem;
}

.nav-links-dark a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

/* Theme Toggle Button */
.theme-toggle {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Burger Menu Button */
.burger-menu {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 102;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
}

.burger-menu span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.burger-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

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

.burger-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--color-bg);
    backdrop-filter: blur(10px);
    z-index: 101;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

[data-theme="dark"] .mobile-menu-overlay {
    background: rgba(0, 0, 0, 0.98);
}

[data-theme="light"] .mobile-menu-overlay {
    background: rgba(240, 253, 244, 0.98);
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: 2rem;
}

.mobile-menu-link {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    transition: all var(--transition-fast);
    opacity: 0;
    transform: translateY(20px);
}

.mobile-menu-overlay.active .mobile-menu-link {
    opacity: 1;
    transform: translateY(0);
}

.mobile-menu-overlay.active .mobile-menu-link:nth-child(1) {
    transition-delay: 0.1s;
}

.mobile-menu-overlay.active .mobile-menu-link:nth-child(2) {
    transition-delay: 0.2s;
}

.mobile-menu-overlay.active .mobile-menu-link:nth-child(3) {
    transition-delay: 0.3s;
}

.mobile-menu-overlay.active .mobile-menu-link:nth-child(4) {
    transition-delay: 0.4s;
}

.mobile-menu-link:hover {
    color: var(--color-primary);
    transform: translateX(10px);
}

/* Mobile Menu Close Button */
.mobile-menu-close {
    position: fixed;
    top: 1.25rem;
    right: 2rem;
    background: transparent;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    z-index: 102;
    padding: 0.5rem;
    opacity: 0;
    transition: opacity var(--transition-normal);
    /* Match burger menu dimensions */
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-menu-overlay.active .mobile-menu-close {
    opacity: 1;
    transition-delay: 0.2s;
}

.mobile-menu-close:hover {
    color: var(--color-primary);
}

/* Theme Toggle in Mobile Menu */
.mobile-theme-toggle {
    display: none;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    margin-top: 2rem;
}

.mobile-theme-toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ===================================
   Hero Section
   =================================== */
.hero-dark {
    position: relative;
    padding: 12rem 0 6rem;
    text-align: center;
    overflow: hidden;
}

/* Waveforms */
.waveform {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 220px;
    height: 60px;
    opacity: 0.6;
    animation: waveAnimation 3s ease-in-out infinite;
}

.waveform-left {
    left: 10%;
}

.waveform-right {
    right: 10%;
}

@keyframes waveAnimation {

    0%,
    100% {
        transform: translateY(-50%) scaleY(1);
    }

    50% {
        transform: translateY(-50%) scaleY(1.2);
    }
}

.hero-content-dark {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.hero-title-dark {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #1F2937 0%, #10B981 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle-dark {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: 3rem;
}

/* Hero CTA */
.hero-cta {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
}

.hero-cta .btn-primary-dark {
    padding: 1rem 3rem;
    font-size: 1.125rem;
}

/* Search Container */
.search-container {
    display: flex;
    gap: 1rem;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.search-input-dark {
    flex: 1;
    padding: 1rem 1.5rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.search-input-dark:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.search-btn-dark {
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.search-btn-dark:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-strong);
}

/* Category Pills */
.category-pills {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.pill {
    padding: 0.625rem 1.5rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pill:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.pill.active {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-color: transparent;
    color: white;
}

/* ===================================
   Audiobooks Section
   =================================== */
.audiobooks-dark {
    padding: 4rem 0;
}

.container-dark {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-header-dark {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

.section-header-dark h2 {
    font-size: 2rem;
    font-weight: 700;
}

.view-all-link {
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.view-all-link:hover {
    color: var(--color-primary-dark);
}

/* Audiobooks Grid */
.audiobooks-grid-dark {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* Responsive Grid */
@media (max-width: 1024px) {
    .audiobooks-grid-dark {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .audiobooks-grid-dark {
        grid-template-columns: 1fr;
    }
}

/* Audiobook Cards */
.audiobook-card-dark {
    position: relative;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.audiobook-card-dark:hover {
    transform: translateY(-5px) !important;
    border-color: rgba(16, 185, 129, 0.5);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.card-glow {
    position: absolute;
    inset: -1px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    border-radius: var(--radius-lg);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: -1;
    filter: blur(20px);
}

.card-image-dark {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    overflow: hidden;
    background: var(--color-bg-tertiary);
}

.card-image-dark img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.placeholder-image {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-bg-secondary) 100%);
}

.card-badge-dark {
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    padding: 0.5rem 1rem;
    background: var(--color-primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 50px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.card-content-dark h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.card-author-dark {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

.card-description-dark {
    font-size: 0.95rem;
    color: var(--color-text-tertiary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.card-link-dark {
    display: inline-flex;
    align-items: center;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.card-link-dark:hover {
    gap: 8px;
    color: var(--color-primary-dark);
}


.featured-dark {
    grid-column: span 2;
}

.featured-dark .card-image-dark {
    aspect-ratio: 2/1;
}

/* ===================================
   About Section
   =================================== */
.about-dark {
    padding: 6rem 0;
    background: var(--color-bg-secondary);
}

.about-grid-dark {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.section-badge-dark {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-radius: 50px;
    margin-bottom: 1.5rem;
}

.about-content-dark h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.lead-text-dark {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: 1rem;
    font-weight: 500;
}

.about-content-dark p {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

/* Stats */
.stats-dark {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
    justify-items: center;
}

.stat-item-dark {
    text-align: center;
    padding: 1.5rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.stat-item-dark:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.stat-number-dark {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.stat-label-dark {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* About Image */
.about-image-dark {
    position: relative;
}

.image-glow {
    position: absolute;
    inset: -20px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    border-radius: var(--radius-lg);
    opacity: 0.3;
    filter: blur(40px);
    z-index: -1;
}

.about-image-dark img {
    width: 100%;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

/* ===================================
   Contact Section
   =================================== */
.contact-dark {
    padding: 6rem 0;
}

.contact-wrapper-dark {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-info-dark h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.contact-info-dark p {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: 3rem;
}

.contact-form-dark {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    text-align: left;
}

.form-group-dark {
    margin-bottom: 1.5rem;
}

.form-group-dark label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text);
}

.form-group-dark input,
.form-group-dark textarea {
    width: 100%;
    padding: 0.875rem 1.125rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group-dark input:focus,
.form-group-dark textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.contact-form-dark .btn-primary-dark {
    display: block;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.btn-primary-dark {
    display: inline-block;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary-dark:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-strong);
}

/* ===================================
   Footer
   =================================== */
.footer-dark {
    padding: 3rem 0 2rem;
    border-top: 1px solid var(--color-border);
}

.footer-content-dark {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-brand-dark {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-name-dark {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.footer-brand-dark p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

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

.footer-links-dark a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

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

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

.footer-bottom-dark p {
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 99;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow-strong);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .featured-dark {
        grid-column: span 1;
    }

    .featured-dark .card-image-dark {
        aspect-ratio: 1;
    }

    .about-grid-dark {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .stats-dark {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links-dark {
        display: none;
    }

    .burger-menu {
        display: flex;
    }

    .theme-toggle {
        display: none;
    }

    .mobile-theme-toggle {
        display: flex;
    }

    .hero-dark {
        padding: 10rem 0 4rem;
    }

    .waveform {
        width: 150px;
        opacity: 0.3;
    }

    .waveform-left {
        left: -12%;
    }

    .waveform-right {
        right: -12%;
    }

    .search-container {
        flex-direction: column;
    }

    .audiobooks-grid-dark {
        grid-template-columns: 1fr;
    }

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

    .footer-content-dark {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container-dark {
        padding: 0 1.25rem;
    }

    .hero-title-dark {
        font-size: 2.5rem;
    }

    .waveform {
        display: none;
    }
}