/* ===== CSS Variables & Design Tokens ===== */
:root {
    /* Base Colors */
    --bg-void: #0a0a0a;
    --bg-surface: #1a1a1a;
    --bg-elevated: #252525;
    --accent-seen: #00ff9d;
    --accent-skip: #ff0055;
    --accent-undo: #888888;
    --text-primary: #f5f5f5;
    --text-secondary: #888888;
    --text-muted: #555555;

    /* Theme Variables (overridden by JS) */
    --theme-primary: #00ff9d;
    --theme-secondary: #ff0055;
    --theme-accent: #ffffff;
    --theme-background: #0a0a0a;
    --theme-surface: #1a1a1a;
    --theme-card-glow: rgba(0, 255, 157, 0.3);
    --theme-font: 'Inter', sans-serif;

    /* Glows */
    --glow-seen: 0 0 30px rgba(0, 255, 157, 0.4);
    --glow-skip: 0 0 30px rgba(255, 0, 85, 0.4);

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

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

    /* Transitions */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Card dimensions */
    --card-width: min(320px, 85vw);
    --card-height: calc(var(--card-width) * 1.5);
    --card-radius: 16px;
}

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

html,
body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-void);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    touch-action: pan-y;
    overscroll-behavior: none;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 100%;
    overflow: hidden;
}

/* ===== Progress Bar ===== */
.progress-bar-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--bg-surface);
    z-index: 100;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-seen), #00ccff);
    transition: width 0.4s var(--ease-out-expo);
    box-shadow: 0 0 10px var(--accent-seen);
}

/* ===== Private Browsing Warning Banner ===== */
.private-browsing-banner {
    position: fixed;
    top: 3px;
    left: 0;
    right: 0;
    background: linear-gradient(90deg, #b45309, #d97706);
    color: white;
    padding: 10px 16px;
    font-size: 0.8rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    z-index: 150;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.private-browsing-banner.fade-out {
    animation: slideUp 0.5s ease-out forwards;
}

@keyframes slideUp {
    to {
        transform: translateY(-100%);
        opacity: 0;
    }
}

.private-browsing-banner .banner-close {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 14px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.private-browsing-banner .banner-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ===== HUD Header ===== */
.hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    padding-top: calc(var(--space-md) + 3px);
    background: linear-gradient(180deg, var(--bg-void) 0%, transparent 100%);
    position: relative;
    z-index: 50;
}

.counter {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: -0.02em;
}

.count-current {
    color: var(--accent-seen);
}

.count-separator {
    color: var(--text-muted);
    margin: 0 2px;
}

.count-total {
    color: var(--text-secondary);
}

.decade-badge {
    background: var(--bg-elevated);
    padding: var(--space-sm) var(--space-lg);
    border-radius: 100px;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border: 2px solid rgba(255, 255, 255, 0.2);
    margin-left: var(--space-lg);
    color: #fff;
}

/* ===== Card Stack Container ===== */
.card-stack-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: var(--space-md);
}

.card-stack {
    position: relative;
    width: var(--card-width);
    height: var(--card-height);
}

/* ===== MOVIE CARD ===== */
.movie-card {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 20px;
    background: var(--bg-surface);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    /* 3D Transform Properties */
    perspective: 1000px;
    cursor: grab;
    user-select: none;
    touch-action: none;
    transform-origin: center bottom;
    transition: transform 0.1s ease-out, box-shadow 0.2s ease;
    will-change: transform;
}

.movie-card:active {
    cursor: grabbing;
}

/* Inner container for 3D flip */
.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
    transform-style: preserve-3d;
    border-radius: 20px;
}

/* Flipped state */
.movie-card.flipped .card-inner {
    transform: rotateY(180deg);
}

/* Front and Back Faces */
.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: 20px;
    overflow: hidden;
}

/* Front Face (Poster) */
.card-front {
    background: var(--bg-surface);
    display: flex;
    flex-direction: column;
}

/* Back Face (Info) */
.card-back {
    background: #1a1a1a;
    color: white;
    transform: rotateY(180deg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: left;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Info content styling */
.card-back-header {
    margin-bottom: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding-bottom: 12px;
}

.card-back-title {
    font-family: var(--font-header);
    font-size: 1.5rem;
    line-height: 1.2;
    display: block;
    margin-bottom: 4px;
}

.card-back-year {
    font-family: var(--font-mono);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.card-back-rating {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.card-back-meta {
    display: flex;
    gap: 12px;
    font-size: 0.85rem;
    color: #aaa;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.card-back-meta span {
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
}

.card-back-cast {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.4;
}

.card-back-overview {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
    overflow-y: auto;
    flex-grow: 1;
    mask-image: linear-gradient(to bottom, black 90%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 90%, transparent 100%);
}

.card-back-footer {
    margin-top: 16px;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-primary);
    opacity: 1;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
}

/* Info Button */
.info-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    z-index: 10;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    line-height: 1;
}

@media (hover: hover) {
    .info-btn:hover {
        background: rgba(0, 0, 0, 0.8);
        border-color: white;
        transform: scale(1.05);
    }
}

.movie-card.flipped .info-btn {
    display: none;
}

.movie-card.dragging {
    transition: none;
}

.movie-card.swipe-right {
    animation: swipeRight 0.4s var(--ease-out-expo) forwards;
}

.movie-card.swipe-left {
    animation: swipeLeft 0.4s var(--ease-out-expo) forwards;
}

@keyframes swipeRight {
    to {
        transform: translateX(150%) rotate(20deg);
        opacity: 0;
    }
}

@keyframes swipeLeft {
    to {
        transform: translateX(-150%) rotate(-20deg);
        opacity: 0;
    }
}

/* Card Stacking Effect - cards peek from behind/below */
.movie-card:nth-child(2) {
    transform: scale(0.98) translateY(-8px);
    filter: brightness(0.7);
    z-index: -1;
}

.movie-card:nth-child(3) {
    transform: scale(0.96) translateY(-14px);
    filter: brightness(0.5);
    z-index: -2;
}

.movie-card:nth-child(n+4) {
    transform: scale(0.94) translateY(-18px);
    filter: brightness(0.3);
    pointer-events: none;
    z-index: -3;
}

/* Card Content */
.card-poster {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
}

.card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-lg);
    background: linear-gradient(0deg, rgba(0, 0, 0, 0.9) 0%, transparent 100%);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.card-year {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Swipe Indicators */
.swipe-indicator {
    position: absolute;
    top: var(--space-lg);
    padding: var(--space-sm) var(--space-lg);
    border-radius: 8px;
    font-weight: 700;
    font-size: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0;
    transform: scale(0.8) rotate(-15deg);
    transition: opacity 0.2s, transform 0.2s;
    pointer-events: none;
}

.swipe-indicator.seen {
    right: var(--space-lg);
    background: var(--accent-seen);
    color: var(--bg-void);
    border: 3px solid var(--accent-seen);
}

.swipe-indicator.skip {
    left: var(--space-lg);
    background: var(--accent-skip);
    color: white;
    border: 3px solid var(--accent-skip);
    transform: scale(0.8) rotate(15deg);
}

.movie-card.hint-right .swipe-indicator.seen,
.movie-card.hint-left .swipe-indicator.skip {
    opacity: 1;
    transform: scale(1) rotate(0deg);
}

/* ===== Loading State ===== */
.loading-state {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    color: var(--text-secondary);
}

.loading-state.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--bg-elevated);
    border-top-color: var(--accent-seen);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ===== Completion State ===== */
.completion-state {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-md);
    padding: var(--space-xl);
}

.completion-state.hidden {
    display: none;
}

.completion-icon {
    font-size: 4rem;
    animation: bounce 1s var(--ease-out-back);
}

@keyframes bounce {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.2);
    }
}

.completion-state h2 {
    font-size: 1.75rem;
    background: linear-gradient(135deg, var(--accent-seen), #00ccff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.completion-state p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ===== Buttons ===== */
.btn {
    padding: var(--space-md) var(--space-xl);
    border: none;
    border-radius: 100px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s var(--ease-out-expo);
}

.btn-primary {
    background: var(--accent-seen);
    color: var(--bg-void);
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: var(--glow-seen);
}

/* ===== Action Bar ===== */
.action-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg);
    padding-bottom: max(var(--space-lg), env(safe-area-inset-bottom));
    background: linear-gradient(0deg, var(--bg-void) 0%, transparent 100%);
}

.action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    border: 2px solid;
    background: transparent;
    cursor: pointer;
    transition: all 0.2s var(--ease-out-expo);
}

.action-btn svg {
    width: 28px;
    height: 28px;
}

.action-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.action-skip {
    border-color: var(--accent-skip);
    color: var(--accent-skip);
}

/* Only show hover effects on devices with real hover (desktop) */
@media (hover: hover) and (pointer: fine) {
    .action-skip:hover:not(:disabled) {
        background: var(--accent-skip);
        color: white;
        box-shadow: var(--glow-skip);
        transform: scale(1.1);
    }

    .action-undo:hover:not(:disabled) {
        background: var(--accent-undo);
        color: var(--bg-void);
    }

    .action-seen:hover:not(:disabled) {
        background: var(--accent-seen);
        color: var(--bg-void);
        box-shadow: var(--glow-seen);
        transform: scale(1.1);
    }
}

/* Touch devices - only active state, no sticky hover */
.action-skip:active:not(:disabled) {
    background: var(--accent-skip);
    color: white;
    transform: scale(0.95);
}

.action-seen:active:not(:disabled) {
    background: var(--accent-seen);
    color: var(--bg-void);
    transform: scale(0.95);
}

.action-undo {
    width: 48px;
    height: 48px;
    border-color: var(--accent-undo);
    color: var(--accent-undo);
}

.action-undo:active:not(:disabled) {
    background: var(--accent-undo);
    color: var(--bg-void);
    transform: scale(0.95);
}

.action-undo svg {
    width: 20px;
    height: 20px;
}

.action-seen {
    border-color: var(--accent-seen);
    color: var(--accent-seen);
}

/* ===== Action Counters (Seen/Not Seen Tally) ===== */
.action-counter {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    min-width: 48px;
    text-align: center;
}

.counter-skip {
    color: var(--accent-skip);
}

.counter-seen {
    color: var(--accent-seen);
}

/* ===== Keyboard Hints (Desktop) ===== */
.keyboard-hints {
    display: none;
    justify-content: center;
    gap: var(--space-xl);
    padding-bottom: var(--space-md);
    color: var(--text-muted);
    font-size: 0.75rem;
}

@media (hover: hover) and (pointer: fine) {
    .keyboard-hints {
        display: flex;
    }
}

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

kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    padding: 0 var(--space-xs);
    background: var(--bg-elevated);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

/* ===== Desktop Enhancements ===== */
@media (min-width: 768px) {
    :root {
        --card-width: 380px;
    }

    .hud {
        padding: var(--space-lg) var(--space-2xl);
    }

    .counter {
        font-size: 1.5rem;
    }

    .action-btn {
        width: 72px;
        height: 72px;
    }

    .action-btn svg {
        width: 32px;
        height: 32px;
    }

    .action-undo {
        width: 56px;
        height: 56px;
    }
}

/* ===== Background Blur Effect (Desktop) ===== */
@media (min-width: 768px) {
    #app::before {
        content: '';
        position: fixed;
        inset: 0;
        background-size: cover;
        background-position: center;
        filter: blur(60px) brightness(0.3);
        transform: scale(1.2);
        z-index: -1;
        opacity: 0;
        transition: opacity 0.5s ease, background-image 0.5s ease;
    }

    #app.has-bg::before {
        opacity: 1;
    }
}

/* ===== HUD Layout Updates ===== */
.hud-left,
.hud-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

/* ===== Icon Buttons ===== */
.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: var(--space-md);
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal {
    background: var(--bg-surface);
    border-radius: 16px;
    width: 100%;
    max-width: 400px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: slideUp 0.3s var(--ease-out-expo);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-body {
    padding: var(--space-lg);
}

/* ===== Settings Sections ===== */
.settings-section {
    margin-bottom: var(--space-xl);
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
}

.section-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

/* ===== Stats Grid ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
}

.stat-item {
    background: var(--bg-elevated);
    padding: var(--space-md);
    border-radius: 12px;
    text-align: center;
}

.stat-value {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-seen);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== Sync Actions ===== */
.sync-actions {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.sync-actions .btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

/* ===== Code Input ===== */
.code-input {
    width: 100%;
    min-height: 80px;
    padding: var(--space-md);
    background: var(--bg-elevated);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    resize: vertical;
    margin-bottom: var(--space-sm);
}

.code-input:focus {
    outline: none;
    border-color: var(--accent-seen);
}

.advanced-export {
    margin-top: 12px;
    font-size: 0.8rem;
}

.advanced-export summary {
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px 0;
}

.advanced-export summary:hover {
    color: var(--text-secondary);
}

.code-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
}

/* ===== Additional Button Styles ===== */
.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: var(--bg-surface);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-small {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
}

.btn-danger {
    background: transparent;
    color: var(--accent-skip);
    border: 1px solid var(--accent-skip);
}

.btn-danger:hover {
    background: var(--accent-skip);
    color: white;
}

/* ===== Completion Actions ===== */
.completion-actions {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-md);
}

/* ===== Toast Notification ===== */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-elevated);
    color: var(--text-primary);
    padding: var(--space-md) var(--space-lg);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 300;
    animation: toastIn 0.3s var(--ease-out-back);
}

.toast.success {
    background: var(--accent-seen);
    color: var(--bg-void);
}

.toast.error {
    background: var(--accent-skip);
    color: white;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* ===== Backup Modal Styles ===== */
#backupModal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 250;
    background: none;
    border-radius: 0;
    max-width: none;
    max-height: none;
    overflow: visible;
    box-shadow: none;
    border: none;
    animation: none;
}

/* Use a specific class to avoid inheriting global .modal-overlay styles */
.backup-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    z-index: -1;
}

#backupModal .modal-content {
    position: relative;
    /* Enforce dark background */
    background: #1a1a1a;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: slideUp 0.3s var(--ease-out-expo);
    z-index: 20;
}

.backup-modal {
    max-width: 360px;
    text-align: center;
    padding: 24px;
    position: relative;
}

.backup-modal .modal-close {
    position: absolute;
    top: 10px;
    right: 10px;
    background: #333;
    border: 1px solid #555;
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 30;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.backup-modal .modal-close:hover {
    background: #444;
}

.backup-modal h2 {
    margin-bottom: 20px;
    font-size: 1.3rem;
    padding-right: 20px;
    color: white;
}

.qr-container {
    background: white;
    padding: 16px;
    border-radius: 12px;
    margin-bottom: 24px;
    display: inline-block;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

#qrCode {
    width: 180px;
    height: 180px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

#qrCode img,
#qrCode canvas {
    max-width: 100%;
    height: auto;
}

.qr-hint {
    color: #333;
    font-size: 0.8rem;
    margin-top: 10px;
    margin-bottom: 0;
    font-weight: 600;
}

.share-options {
    margin-bottom: 20px;
}

.share-label {
    color: #aaa;
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.share-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #2a2a2a;
    /* Solid background */
    border: 1px solid #444;
    border-radius: 12px;
    padding: 12px 0;
    width: 70px;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.share-btn:hover {
    background: #333;
    transform: translateY(-2px);
    border-color: #666;
}

.share-btn:active {
    transform: translateY(0);
}

.share-icon {
    font-size: 1.5rem;
}

.share-text {
    font-size: 0.7rem;
    opacity: 0.8;
}

.backup-footer {
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.backup-note {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0;
}

.backup-note strong {
    color: var(--accent-seen);
}

/* Backup Reminder Banner */
.backup-reminder-banner {
    position: fixed;
    top: 3px;
    left: 0;
    right: 0;
    background: linear-gradient(90deg, #059669, #10b981);
    color: white;
    padding: 10px 16px;
    font-size: 0.8rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    z-index: 150;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    animation: slideDown 0.3s ease-out;
}

.backup-reminder-banner .backup-now-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.backup-reminder-banner .backup-now-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.backup-reminder-banner .banner-close {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 14px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.backup-reminder-banner .banner-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ===== Decade Theme Styles ===== */

/* Theme transitions */
body {
    transition: background-color 0.5s ease, color 0.3s ease;
}

/* Apply theme colors to key elements */
body[data-theme] {
    background-color: var(--theme-background);
}

body[data-theme] .decade-badge {
    background: var(--theme-primary);
    color: var(--theme-background);
}

/* Keep original button colors - don't override with theme */
/* The green/red buttons are already well-designed */

body[data-theme] .progress-fill {
    background: linear-gradient(90deg, var(--theme-primary), var(--theme-secondary));
}

body[data-theme] .swipe-indicator.seen {
    background: var(--theme-primary);
}

/* 1980s Neon Theme - BOLD synthwave */
body[data-theme="1980s"] {
    background: linear-gradient(180deg, #1a0a3e 0%, #0d051a 50%, #1a0825 100%);
}

body[data-theme="1980s"]::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        /* Neon grid lines - more visible */
        linear-gradient(transparent 0%, transparent 48%, rgba(255, 0, 255, 0.15) 50%, transparent 52%, transparent 100%),
        linear-gradient(90deg, transparent 0%, transparent 48%, rgba(0, 255, 255, 0.12) 50%, transparent 52%, transparent 100%);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
    opacity: 0.8;
}

/* Neon glow at bottom edge for 80s */
body[data-theme="1980s"]::after {
    content: '';
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 150px;
    background: linear-gradient(to top, rgba(255, 0, 255, 0.2), transparent);
    pointer-events: none;
    z-index: 0;
}

body[data-theme="1980s"] .decade-badge {
    background: linear-gradient(135deg, #ff00ff, #cc00cc);
    color: #fff;
    border: 2px solid #00ffff;
    text-shadow: 0 0 10px rgba(255, 0, 255, 0.5);
    font-family: 'Inter', sans-serif;
}

/* 1990s Grunge Theme - Dark and edgy */
body[data-theme="1990s"] {
    background: linear-gradient(180deg, #1a1412 0%, #0a0808 100%);
}

body[data-theme="1990s"]::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(139, 0, 0, 0.15) 0%, transparent 40%),
        radial-gradient(ellipse at 70% 80%, rgba(139, 69, 19, 0.1) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
}

body[data-theme="1990s"] .decade-badge {
    font-family: 'Rock Salt', cursive;
    font-size: 0.6rem;
    letter-spacing: 0;
    background: #8b0000;
    border: 2px solid #5a0000;
    text-shadow: 1px 1px 0 #000;
}

body[data-theme="1990s"] .movie-card {
    box-shadow:
        0 10px 40px rgba(0, 0, 0, 0.8),
        inset 0 0 60px rgba(139, 0, 0, 0.1);
}

/* 2000s Y2K Theme - Matrix/Tech vibes */
body[data-theme="2000s"] {
    background: linear-gradient(180deg, #0a0f0a 0%, #001a00 50%, #000a05 100%);
}

body[data-theme="2000s"]::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at center, rgba(0, 255, 65, 0.12) 0%, transparent 50%),
        linear-gradient(180deg, transparent 0%, rgba(0, 255, 0, 0.03) 100%);
    pointer-events: none;
    z-index: 0;
}

body[data-theme="2000s"] .decade-badge {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background: linear-gradient(135deg, #00ff41, #00aa2a);
    color: #000;
    border: 1px solid #00ff41;
    text-shadow: none;
}

/* 2010s Modern Theme - Clean dark */
body[data-theme="2010s"] {
    background: linear-gradient(180deg, #111111 0%, #0a0a0a 100%);
}

body[data-theme="2010s"] .decade-badge {
    background: linear-gradient(135deg, #1db954, #1aa34a);
    color: #fff;
}

/* 2020s Neo Modern Theme - Vibrant gradients */
body[data-theme="2020s"] {
    background: linear-gradient(135deg, #0f0515 0%, #150520 50%, #0a0a15 100%);
}

body[data-theme="2020s"]::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(168, 85, 247, 0.2) 0%, transparent 40%),
        radial-gradient(ellipse at 80% 70%, rgba(236, 72, 153, 0.15) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
}

body[data-theme="2020s"] .decade-badge {
    background: linear-gradient(135deg, #a855f7, #ec4899);
    color: #fff;
}

/* ===== Card Flip Styles ===== */
.movie-card {
    perspective: 1000px;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

.movie-card.flipped .card-inner {
    transform: rotateY(180deg);
}

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--card-radius);
    overflow: hidden;
}

.card-front {
    z-index: 2;
}

.card-back {
    transform: rotateY(180deg);
    background: var(--theme-surface, var(--bg-surface));
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
}

.card-back-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.card-back-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-back-year {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.card-back-rating {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.rating-stars {
    color: #fbbf24;
    font-size: 1rem;
}

.rating-value {
    font-weight: 600;
    color: var(--text-primary);
}

.card-back-overview {
    flex: 1;
    overflow-y: auto;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.card-back-footer {
    margin-top: var(--space-md);
    text-align: center;
}

.flip-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ===== Streak Indicator ===== */
.streak-indicator {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #ff6b00, #ff0055);
    color: white;
    padding: var(--space-xs) var(--space-md);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    box-shadow: 0 4px 20px rgba(255, 107, 0, 0.4);
    animation: streakPulse 0.5s ease-out;
    z-index: 100;
}

.streak-indicator.hidden {
    display: none;
}

.streak-indicator.hot {
    animation: streakPulse 0.5s ease-out, fireGlow 1s ease-in-out infinite;
}

@keyframes streakPulse {
    0% {
        transform: translateX(-50%) scale(0.5);
        opacity: 0;
    }

    50% {
        transform: translateX(-50%) scale(1.1);
    }

    100% {
        transform: translateX(-50%) scale(1);
        opacity: 1;
    }
}

@keyframes fireGlow {

    0%,
    100% {
        box-shadow: 0 4px 20px rgba(255, 107, 0, 0.4);
    }

    50% {
        box-shadow: 0 4px 30px rgba(255, 107, 0, 0.7), 0 0 40px rgba(255, 0, 85, 0.5);
    }
}

/* ===== Rank Badge ===== */
.rank-badge {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    font-size: 0.75rem;
}

.rank-emoji {
    font-size: 1rem;
}

.rank-name {
    font-weight: 500;
    color: var(--text-secondary);
}

/* ===== Confetti Animation ===== */
@keyframes confetti-fall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }

    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

.confetti-piece {
    border-radius: 2px;
}

/* ===== Decade Transition Toast ===== */
.decade-toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--theme-surface);
    border: 2px solid var(--theme-primary);
    padding: var(--space-lg) var(--space-xl);
    border-radius: 16px;
    text-align: center;
    z-index: 500;
    animation: decadeToastIn 0.5s var(--ease-out-back), decadeToastOut 0.5s ease 2s forwards;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px var(--theme-card-glow);
}

.decade-toast h2 {
    font-size: 2rem;
    color: var(--theme-primary);
    margin-bottom: var(--space-xs);
}

.decade-toast p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

@keyframes decadeToastIn {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.5);
    }

    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

@keyframes decadeToastOut {
    0% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }

    100% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.8);
        pointer-events: none;
    }
}