/* =============================================================================
   BASE STYLES - APPLE-INSPIRED DESIGN SYSTEM

   Design Philosophy:
   - Warmth & Approachability with precision
   - 4px grid system for spacing
   - SF Pro typography hierarchy
   - Refined color palette with depth

   Design Direction: Warmth & Sophistication
   - Dark foundation for premium feel
   - Generous spacing for focused browsing
   - Subtle depth via borders + single shadows
   - Pink accent for energy and brand continuity
   ============================================================================= */
:root {
    /* Colors - Pure dark foundation with warm accent */
    --bg-primary: #000000;
    --bg-secondary: #1c1c1e;
    --bg-tertiary: #2c2c2e;
    --bg-elevated: #3a3a3c;

    /* Text hierarchy - 4 levels */
    --text-primary: rgba(255, 255, 255, 0.95);
    --text-secondary: rgba(255, 255, 255, 0.70);
    --text-tertiary: rgba(255, 255, 255, 0.50);
    --text-faint: rgba(255, 255, 255, 0.30);

    /* Accent - Apple Music pink */
    --accent-color: #ff375f;
    --accent-hover: #ff4d73;
    --accent-subtle: rgba(255, 55, 95, 0.15);

    /* Borders - subtle definition */
    --border-color: rgba(255, 255, 255, 0.10);
    --border-subtle: rgba(255, 255, 255, 0.06);

    /* Status colors */
    --color-success: #30d158;
    --color-warning: #ffd60a;
    --color-error: #ff453a;

    /* Typography - SF Pro scale */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-base: 15px;
    --font-size-lg: 17px;
    --font-size-xl: 22px;
    --font-size-2xl: 28px;
    --font-size-3xl: 34px;

    /* Spacing - 4px grid */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* Borders - Apple's softer curves */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Shadows - Single shadow approach for dark mode */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);

    /* Animation - Apple's signature curves */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
    --transition-fast: 150ms var(--ease-out-quart);
    --transition-base: 200ms var(--ease-out-quart);
    --transition-slow: 300ms var(--ease-out-expo);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Prevent text size adjustment on orientation change */
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    /* Improve touch scrolling on iOS */
    -webkit-overflow-scrolling: touch;
    /* Prevent pull-to-refresh on mobile */
    overscroll-behavior-y: contain;
}

/* =============================================================================
   iOS SAFARI OPTIMIZATIONS
   Consistent app-like behavior across all interactive elements
   ============================================================================= */

/* Disable tap highlight on all interactive elements */
button, a, input, select, textarea, [role="button"], [tabindex] {
    -webkit-tap-highlight-color: transparent;
}

/* Prevent double-tap zoom on all interactive elements (iOS Safari) */
button, a, input, select, label, [role="button"], [tabindex] {
    touch-action: manipulation;
}

/* Better touch targets for interactive elements (Apple HIG: 44pt minimum) */
@media (pointer: coarse) {
    button, a, input[type="range"], [role="button"] {
        min-height: 44px;
        min-width: 44px;
    }
}

/* =============================================================================
   LAYOUT - SIDEBAR + MAIN CONTENT
   Sidebar on tablet/desktop, tab bar on mobile
   ============================================================================= */
:root {
    --sidebar-width: 220px;
}

.app-container {
    max-width: 960px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    /* Add top safe area for iOS status bar in native app */
    padding-top: calc(var(--spacing-lg) + env(safe-area-inset-top, 0));
    min-height: 100vh;
}

/* =============================================================================
   SIDEBAR NAVIGATION
   Modern sidebar for tablet/desktop (hidden on mobile)
   ============================================================================= */
.sidebar {
    display: none;
}

/* =============================================================================
   TAB BAR NAVIGATION
   iOS-style bottom tab bar for mobile only
   ============================================================================= */
.tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    gap: 0;
    background: rgba(28, 28, 30, 0.85);
    border-top: 0.5px solid var(--border-color);
    padding-bottom: env(safe-area-inset-bottom, 0);
    z-index: 50;
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
}

.tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: var(--spacing-sm) var(--spacing-xl);
    min-width: 80px;
    text-decoration: none;
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.tab-item:hover {
    color: var(--text-secondary);
}

.tab-item.active {
    color: var(--accent-color);
}

.tab-icon {
    width: 24px;
    height: 24px;
}

.tab-label {
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.01em;
}

/* Mobile: Add padding for tab bar */
body.has-navigation .app-container {
    padding-bottom: calc(60px + env(safe-area-inset-bottom, 0));
}

/* =============================================================================
   TABLET/DESKTOP: SIDEBAR LAYOUT
   Show sidebar, hide tab bar
   ============================================================================= */
@media (min-width: 768px) {
    /* Hide tab bar on larger screens */
    .tab-bar {
        display: none;
    }

    /* Show and style sidebar */
    .sidebar {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: var(--sidebar-width);
        background: var(--bg-secondary);
        border-right: 0.5px solid var(--border-subtle);
        z-index: 40;
    }

    .sidebar-header {
        padding: var(--spacing-lg) var(--spacing-md);
        border-bottom: 0.5px solid var(--border-subtle);
    }

    .sidebar-logo {
        font-size: var(--font-size-lg);
        font-weight: 700;
        color: var(--text-primary);
        letter-spacing: -0.02em;
    }

    .sidebar-nav {
        flex: 1;
        padding: var(--spacing-md);
        display: flex;
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .sidebar-item {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        padding: var(--spacing-sm) var(--spacing-md);
        border-radius: var(--radius-md);
        text-decoration: none;
        color: var(--text-secondary);
        font-size: var(--font-size-base);
        font-weight: 500;
        transition: all var(--transition-fast);
    }

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

    .sidebar-item.active {
        background: var(--accent-subtle);
        color: var(--accent-color);
    }

    .sidebar-icon {
        width: 22px;
        height: 22px;
        flex-shrink: 0;
    }

    .sidebar-label {
        flex: 1;
    }

    /* Offset main content for sidebar */
    body.has-navigation .app-container {
        margin-left: var(--sidebar-width);
        padding-bottom: var(--spacing-lg);
        max-width: calc(960px + var(--sidebar-width));
    }
}

/* =============================================================================
   PAGE HEADER
   iOS-style navigation bar with back button
   ============================================================================= */
.page-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-md);
    min-height: 44px;
}

.page-header .back-button {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--accent-color);
    text-decoration: none;
    font-size: var(--font-size-base);
    font-weight: 400;
    padding: var(--spacing-xs) 0;
    margin-left: -4px;
    transition: opacity var(--transition-fast);
    flex-shrink: 0;
}

.page-header .back-button:hover {
    opacity: 0.7;
}

.page-header .back-button svg {
    width: 20px;
    height: 20px;
}

.page-header .page-title {
    flex: 1;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Spacer to balance back button */
.page-header .header-spacer {
    width: 60px;
    flex-shrink: 0;
}

/* Large title style (for root pages like Library, Learn) */
.page-title-large {
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.page-title-large h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.page-title-large .subtitle {
    font-size: var(--font-size-base);
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
}

/* =============================================================================
   LIBRARY PAGE
   Apple Music-inspired podcast library with show cards
   ============================================================================= */
.library-header {
    /* Uses page-title-large styles */
}

.library-content {
    padding: var(--spacing-md) 0 var(--spacing-2xl);
}

/* =============================================================================
   EPISODE LIST
   Apple Music-inspired episode rows with artwork and metadata
   ============================================================================= */
.episode-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.episode-item {
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.episode-item:hover {
    background-color: var(--bg-secondary);
}

.episode-item.no-transcript {
    opacity: 0.5;
}

.episode-item.no-transcript:hover {
    background-color: transparent;
}

.episode-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    text-decoration: none;
    color: inherit;
}

.episode-item.no-transcript .episode-link {
    cursor: not-allowed;
}

.episode-artwork {
    width: 56px;
    height: 56px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
}

.episode-artwork svg {
    width: 24px;
    height: 24px;
    color: var(--text-tertiary);
}

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

.episode-title {
    font-size: var(--font-size-base);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.episode-meta {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    align-items: center;
    font-variant-numeric: tabular-nums;
}

.episode-meta span {
    white-space: nowrap;
}

.file-type {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.status {
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.status.transcribed {
    color: var(--color-success);
}

.status.pending {
    color: var(--text-faint);
}

.episode-action {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chevron {
    width: 20px;
    height: 20px;
    color: var(--text-faint);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.episode-item:hover .chevron {
    color: var(--text-tertiary);
    transform: translateX(2px);
}

/* =============================================================================
   EMPTY STATE
   Friendly empty state with icon and message
   ============================================================================= */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    color: var(--text-secondary);
}

.empty-state svg {
    width: 56px;
    height: 56px;
    margin-bottom: var(--spacing-lg);
    color: var(--text-faint);
}

.empty-state h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.empty-state p {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.empty-state code {
    background: var(--bg-secondary);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Selection */
::selection {
    background: var(--accent-color);
    color: white;
}

/* =============================================================================
   SHOW CARDS GRID
   Podcast show cards with artwork and episode previews
   ============================================================================= */
.shows-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.show-card-public {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
    overflow: hidden;
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.show-card-public:hover {
    transform: translateY(-2px);
    border-color: var(--border-color);
}

.show-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
}

/* Mobile-first: horizontal layout */
.show-card-header {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    padding: var(--spacing-md);
}

.show-card-image {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-md);
    object-fit: cover;
    background: var(--bg-tertiary);
    flex-shrink: 0;
}

.show-card-image-placeholder {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-color), #ff6b8b);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.show-card-image-placeholder svg {
    width: 32px;
    height: 32px;
    color: white;
    opacity: 0.9;
}

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

.show-card-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: var(--spacing-xs);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--text-primary);
}

.show-card-author {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.show-card-meta {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    font-variant-numeric: tabular-nums;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.level-badge-small {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* Desktop: restore vertical card layout */
@media (min-width: 641px) {
    .show-card-header {
        display: block;
        padding: 0;
    }

    .show-card-image {
        width: 100%;
        height: auto;
        aspect-ratio: 1;
        border-radius: 0;
    }

    .show-card-image-placeholder {
        width: 100%;
        height: auto;
        aspect-ratio: 1;
        border-radius: 0;
    }

    .show-card-image-placeholder svg {
        width: 64px;
        height: 64px;
    }

    .show-card-info {
        padding: var(--spacing-md);
    }

    .show-card-title {
        font-size: var(--font-size-lg);
    }
}

.show-card-episodes {
    padding: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-subtle);
}

.show-card-episodes h3 {
    font-size: var(--font-size-xs);
    color: var(--text-faint);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.episode-list-compact {
    list-style: none;
}

.episode-list-compact li {
    margin-bottom: 2px;
}

.episode-list-compact li:last-child {
    margin-bottom: 0;
}

.episode-link-compact {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--text-secondary);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.episode-link-compact:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.episode-title-compact {
    font-size: var(--font-size-sm);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.status-dot.transcribed {
    background: var(--color-success);
}

.view-all-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.view-all-link:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.view-all-link svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.view-all-link:hover svg {
    transform: translateX(2px);
}

/* =============================================================================
   SHOW PAGE
   Individual podcast show with hero and episode list
   ============================================================================= */
.show-header-public {
    padding: 0 0 var(--spacing-md);
}

.show-hero {
    display: flex;
    gap: var(--spacing-xl);
    align-items: flex-start;
}

.show-hero-image {
    width: 180px;
    height: 180px;
    border-radius: var(--radius-lg);
    object-fit: cover;
    flex-shrink: 0;
    box-shadow: var(--shadow-lg);
}

.show-hero-placeholder {
    width: 180px;
    height: 180px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--accent-color), #ff6b8b);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: var(--shadow-lg);
}

.show-hero-placeholder svg {
    width: 72px;
    height: 72px;
    color: white;
    opacity: 0.9;
}

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

.show-hero-info h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.show-hero-info .show-author {
    font-size: var(--font-size-base);
    color: var(--accent-color);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.show-hero-info .show-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.show-meta-public {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    font-variant-numeric: tabular-nums;
}

.show-content {
    padding: var(--spacing-xl) 0 var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

/* Episode artwork image */
.episode-artwork img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-md);
}

/* Player extras */
.show-info-small {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-top: var(--spacing-sm);
    text-align: center;
}

.show-name {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.episode-date {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.artwork-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-md);
}

.no-transcript-notice {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.no-transcript-notice svg {
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-md);
}

.no-transcript-notice h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.no-transcript-notice p {
    font-size: var(--font-size-sm);
}

.no-transcript-main {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-tertiary);
    font-size: var(--font-size-base);
}

/* =============================================================================
   RESPONSIVE - MOBILE
   ============================================================================= */
@media (max-width: 640px) {
    .app-container {
        padding: var(--spacing-md);
    }

    /* Large page titles */
    .page-title-large h1 {
        font-size: var(--font-size-2xl);
    }

    .page-title-large .subtitle {
        font-size: var(--font-size-sm);
    }

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

    .show-hero-image,
    .show-hero-placeholder {
        width: 140px;
        height: 140px;
    }

    .show-hero-info h1 {
        font-size: var(--font-size-xl);
    }

    .shows-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .episode-artwork {
        width: 48px;
        height: 48px;
    }

    .episode-link {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .episode-title {
        font-size: var(--font-size-sm);
    }

    .episode-meta {
        font-size: var(--font-size-xs);
    }

    .section-title {
        font-size: var(--font-size-lg);
        margin-bottom: var(--spacing-md);
    }
}

/* Tablet adjustments */
@media (min-width: 641px) and (max-width: 1023px) {
    .shows-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}