/* ============================================================
   ART EXPLORER — Immersive Cinematic Theme
   ============================================================ */

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

/* ===== Tokens ===== */
:root {
    --bg: #050507;
    --bg-elevated: #0c0c10;
    --bg-card: #111117;
    --bg-glass: rgba(12, 12, 18, 0.7);
    --text: #eae6df;
    --text-secondary: #9e9a94;
    --text-muted: #5c5955;
    --accent: #d4a84b;
    --accent-glow: rgba(212, 168, 75, 0.25);
    --accent-soft: rgba(212, 168, 75, 0.08);
    --border: #1e1e28;
    --border-light: #2a2a36;
    --radius: 16px;
    --radius-sm: 10px;
    --font-heading: 'Cormorant Garamond', 'Georgia', serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Prevent scrolling while hero is visible */
body.no-scroll {
    overflow: hidden;
}

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg);
}
::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

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

/* ================================================================
   HERO — Full-Viewport Intro
   ================================================================ */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    z-index: 1;
    cursor: pointer;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 50% at 50% 45%, rgba(212, 168, 75, 0.06) 0%, transparent 70%),
        radial-gradient(ellipse 80% 60% at 20% 80%, rgba(80, 60, 30, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse 80% 60% at 80% 20%, rgba(60, 50, 80, 0.06) 0%, transparent 60%),
        var(--bg);
    animation: heroBgShift 20s ease-in-out infinite alternate;
    z-index: -1;
}

@keyframes heroBgShift {
    0% { transform: scale(1) translateY(0); }
    100% { transform: scale(1.05) translateY(-10px); }
}

.hero-content {
    text-align: center;
    padding: 0 24px;
    animation: heroFadeIn 1.5s var(--ease-out) both;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-eyebrow {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.25em;
    color: var(--accent);
    margin-bottom: 20px;
    opacity: 0;
    animation: heroFadeIn 1s 0.3s var(--ease-out) both;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(3.5rem, 8vw, 7rem);
    font-weight: 300;
    letter-spacing: -0.03em;
    line-height: 1.05;
    color: var(--text);
    margin-bottom: 20px;
    opacity: 0;
    animation: heroFadeIn 1.2s 0.5s var(--ease-out) both;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-size: clamp(1rem, 2vw, 1.2rem);
    font-weight: 300;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 48px;
    opacity: 0;
    animation: heroFadeIn 1.2s 0.7s var(--ease-out) both;
}

/* Hero Button */
.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    padding: 18px 48px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--bg);
    background: var(--accent);
    border: none;
    border-radius: 60px;
    cursor: pointer;
    transition: all 0.4s var(--ease-out);
    opacity: 0;
    animation: heroFadeIn 1s 1s var(--ease-out) both;
    position: relative;
    overflow: hidden;
}

.hero-btn::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 62px;
    background: var(--accent);
    opacity: 0;
    filter: blur(20px);
    transition: opacity 0.4s ease;
    z-index: -1;
}

.hero-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px var(--accent-glow);
}

.hero-btn:hover::before {
    opacity: 0.4;
}

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

.hero-btn-arrow {
    transition: transform 0.3s var(--ease-out);
    font-size: 1.2rem;
}

.hero-btn:hover .hero-btn-arrow {
    transform: translateX(4px);
}

/* Scroll Hint */
.hero-scroll-hint {
    position: absolute;
    bottom: 36px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    opacity: 0;
    animation: heroFadeIn 1s 1.5s var(--ease-out) both;
}

.hero-scroll-hint span {
    font-size: 0.7rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-muted);
}

.hero-scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--text-muted), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* Hero hidden after first click */
.hero.hero-hidden {
    display: none;
}

/* ================================================================
   ARTWORK VIEW
   ================================================================ */
.artwork-view {
    min-height: 100vh;
    opacity: 1;
    transition: opacity 0.6s var(--ease-out);
}

.artwork-view.hidden {
    display: none;
}

.artwork-view.fade-out {
    opacity: 0;
}

.artwork-view.fade-in {
    opacity: 1;
}

/* ================================================================
   IMAGE STAGE — Full-Width Cinematic
   ================================================================ */
.image-stage {
    position: relative;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    max-height: 88vh;
    background: var(--bg);
    overflow: hidden;
}

.artwork-image {
    display: block;
    width: 100%;
    max-height: 85vh;
    object-fit: contain;
    opacity: 0;
    transform: scale(1.02);
    transition: opacity 0.8s var(--ease-out), transform 8s var(--ease-in-out);
    will-change: transform, opacity;
}

.artwork-image.visible {
    opacity: 1;
    transform: scale(1);
}

/* Ken Burns — gentle drift while viewing */
.artwork-image.ken-burns {
    animation: kenBurns 25s var(--ease-in-out) infinite alternate;
}

@keyframes kenBurns {
    0% { transform: scale(1) translate(0, 0); }
    100% { transform: scale(1.04) translate(-0.5%, -0.3%); }
}

.artwork-image.loading-state {
    opacity: 0 !important;
}

/* Vignette gradient overlay */
.image-vignette {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 55%;
    background: linear-gradient(
        to top,
        var(--bg) 0%,
        rgba(5, 5, 7, 0.85) 25%,
        rgba(5, 5, 7, 0.4) 55%,
        transparent 100%
    );
    pointer-events: none;
    z-index: 1;
}

/* Overlay Info — sits on top of vignette */
.image-overlay-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0 48px 40px;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.movement-badge {
    display: inline-block;
    padding: 5px 16px;
    font-family: var(--font-body);
    font-size: 0.68rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
    background: var(--accent-soft);
    border: 1px solid rgba(212, 168, 75, 0.2);
    border-radius: 30px;
    margin-bottom: 16px;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s 0.1s var(--ease-out), transform 0.6s 0.1s var(--ease-out);
}

.movement-badge:empty {
    display: none;
}

.overlay-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.8rem);
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 10px;
    max-width: 800px;
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s 0.2s var(--ease-out), transform 0.6s 0.2s var(--ease-out);
}

.overlay-artist {
    font-family: var(--font-heading);
    font-size: clamp(1rem, 2vw, 1.35rem);
    font-weight: 300;
    font-style: italic;
    color: var(--text-secondary);
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s 0.35s var(--ease-out), transform 0.6s 0.35s var(--ease-out);
}

/* Stagger animation trigger */
.artwork-view.info-visible .movement-badge,
.artwork-view.info-visible .overlay-title,
.artwork-view.info-visible .overlay-artist {
    opacity: 1;
    transform: translateY(0);
}

/* Loading Spinner */
.loading-spinner {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.85rem;
    z-index: 3;
}

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

.spinner {
    width: 36px;
    height: 36px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Image Placeholder (hidden state) */
.image-placeholder.hidden {
    display: none;
}

/* ================================================================
   META BAR
   ================================================================ */
.meta-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px 48px;
    border-bottom: 1px solid var(--border);
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.5s 0.4s var(--ease-out), transform 0.5s 0.4s var(--ease-out);
}

.artwork-view.info-visible .meta-bar {
    opacity: 1;
    transform: translateY(0);
}

.meta-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.meta-item {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--text-secondary);
    letter-spacing: 0.01em;
}

.meta-item:empty {
    display: none;
}

.meta-item:empty + .meta-divider {
    display: none;
}

.meta-divider {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--text-muted);
    flex-shrink: 0;
}

.meta-right {
    flex-shrink: 0;
}

.artwork-counter {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

/* ================================================================
   TAB NAVIGATION
   ================================================================ */
.tabs-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 48px 60px;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.5s 0.5s var(--ease-out), transform 0.5s 0.5s var(--ease-out);
}

.artwork-view.info-visible .tabs-container {
    opacity: 1;
    transform: translateY(0);
}

.tab-bar {
    display: flex;
    gap: 4px;
    padding: 6px;
    margin: 28px 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
}

.tab-btn {
    flex: 1;
    padding: 12px 20px;
    font-family: var(--font-body);
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--text-muted);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s var(--ease-out);
    position: relative;
}

.tab-btn:hover {
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.03);
}

.tab-btn.active {
    color: var(--text);
    background: var(--bg-elevated);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

/* Tab Panels */
.tab-panel {
    display: none;
    animation: panelFadeIn 0.4s var(--ease-out) both;
}

.tab-panel.active {
    display: block;
}

@keyframes panelFadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.panel-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.9;
}

.panel-text p {
    margin-bottom: 18px;
}

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

/* Facts List */
.facts-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.facts-list li {
    position: relative;
    padding-left: 24px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.facts-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    opacity: 0.7;
}

/* ================================================================
   FLOATING DISCOVER BUTTON
   ================================================================ */
.floating-btn {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(0);
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 36px;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--bg);
    background: var(--accent);
    border: none;
    border-radius: 60px;
    cursor: pointer;
    z-index: 100;
    box-shadow: 0 8px 32px var(--accent-glow), 0 2px 8px rgba(0,0,0,0.4);
    transition: all 0.4s var(--ease-out);
    animation: floatingPulse 3s ease-in-out infinite;
}

.floating-btn.hidden {
    display: none;
}

@keyframes floatingPulse {
    0%, 100% { box-shadow: 0 8px 32px var(--accent-glow), 0 2px 8px rgba(0,0,0,0.4); }
    50% { box-shadow: 0 8px 48px rgba(212, 168, 75, 0.35), 0 2px 8px rgba(0,0,0,0.4); }
}

.floating-btn:hover {
    transform: translateX(-50%) translateY(-3px);
    box-shadow: 0 14px 50px rgba(212, 168, 75, 0.4), 0 4px 12px rgba(0,0,0,0.5);
    animation: none;
}

.floating-btn:active {
    transform: translateX(-50%) translateY(0);
}

.floating-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    animation: none;
}

.floating-btn-icon {
    font-size: 1.1rem;
    transition: transform 0.3s var(--ease-out);
}

.floating-btn:hover .floating-btn-icon {
    transform: translateX(3px);
}

/* ================================================================
   KEYBOARD HINT
   ================================================================ */
.keyboard-hint {
    position: fixed;
    bottom: 88px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.68rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    z-index: 99;
    opacity: 0;
    transition: opacity 0.5s ease;
    pointer-events: none;
}

.keyboard-hint.hidden {
    display: none;
}

.keyboard-hint.visible {
    opacity: 1;
}

/* ================================================================
   FOOTER
   ================================================================ */
.footer {
    text-align: center;
    padding: 40px 24px 100px;
    border-top: 1px solid var(--border);
}

.footer p {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.02em;
}

.footer a {
    color: var(--text-muted);
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    transition: all 0.3s ease;
}

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

/* ================================================================
   PROGRESS BAR
   ================================================================ */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: rgba(255, 255, 255, 0.05);
    z-index: 200;
    overflow: hidden;
}

.progress-bar.hidden {
    display: none;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), rgba(212, 168, 75, 0.6));
    border-radius: 0 2px 2px 0;
    transition: width 0.8s var(--ease-out);
    box-shadow: 0 0 12px var(--accent-glow);
}

/* ================================================================
   FULLSCREEN LIGHTBOX
   ================================================================ */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: zoom-out;
    opacity: 0;
    transition: opacity 0.35s var(--ease-out);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.lightbox.hidden {
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
}

.lightbox.visible {
    opacity: 1;
    visibility: visible;
}

.lightbox-img {
    max-width: 92vw;
    max-height: 92vh;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 20px 80px rgba(0, 0, 0, 0.6);
    transform: scale(0.92);
    transition: transform 0.4s var(--ease-out);
    cursor: default;
}

.lightbox.visible .lightbox-img {
    transform: scale(1);
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 24px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 1001;
}

.lightbox-close:hover {
    color: var(--text);
    background: rgba(255, 255, 255, 0.15);
    transform: scale(1.1);
}

/* Make artwork image look clickable */
.artwork-image.visible {
    cursor: zoom-in;
}

/* ================================================================
   IMPROVED IMAGE PLACEHOLDER
   ================================================================ */
.image-placeholder {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    width: 100%;
    height: 100%;
    color: var(--text-muted);
    z-index: 3;
}

.placeholder-icon {
    opacity: 0.4;
}

.placeholder-title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--text-secondary);
}

.placeholder-sub {
    font-size: 0.8rem;
    color: var(--text-muted);
    opacity: 0.7;
}

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 768px) {
    .hero-title {
        font-size: clamp(2.8rem, 10vw, 4.5rem);
    }

    .hero-btn {
        padding: 15px 36px;
        font-size: 0.85rem;
    }

    .image-overlay-info {
        padding: 0 24px 28px;
    }

    .overlay-title {
        font-size: clamp(1.6rem, 6vw, 2.5rem);
    }

    .overlay-artist {
        font-size: 1rem;
    }

    .meta-bar {
        padding: 16px 24px;
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }

    .tabs-container {
        padding: 0 24px 60px;
    }

    .tab-bar {
        flex-direction: column;
    }

    .tab-btn {
        text-align: left;
        padding: 12px 16px;
    }

    .floating-btn {
        bottom: 20px;
        padding: 14px 28px;
        font-size: 0.8rem;
    }

    .keyboard-hint {
        display: none;
    }

    .lightbox-close {
        top: 12px;
        right: 12px;
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }

    .lightbox-img {
        max-width: 96vw;
        max-height: 96vh;
    }
}

@media (max-width: 480px) {
    .hero-subtitle {
        font-size: 0.9rem;
    }

    .hero-subtitle br {
        display: none;
    }

    .overlay-title {
        font-size: 1.5rem;
    }

    .meta-left {
        gap: 8px;
    }

    .meta-item {
        font-size: 0.72rem;
    }

    .panel-text,
    .facts-list li {
        font-size: 0.88rem;
    }

    .footer {
        padding-bottom: 80px;
    }
}