/* ==========================================================================
   LUMEN Portfolio - Modular CSS Architecture v6.0
   Fine-Art Minimalist Design System & Device Isolation Layer
   ========================================================================== */

:root {
    --bg-primary: #070709;
    --bg-secondary: #111114;
    --bg-surface: #17171c;
    --bg-glass: rgba(11, 11, 14, 0.85);
    --bg-modal: rgba(5, 5, 7, 0.92);

    --text-main: #faf8f5;
    --text-muted: #8e8e98;
    --text-subtle: #52525c;

    --accent-gold: #e5c158;
    --accent-gold-light: #f9ebb9;
    --accent-gold-glow: rgba(229, 193, 88, 0.18);
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.16);
    --border-gold: rgba(229, 193, 88, 0.35);

    --font-display: 'Playfair Display', 'Noto Serif SC', serif;
    --font-body: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
    --font-mono: 'Space Mono', monospace;

    --nav-height: 60px;
    --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 0.18s ease;
}

[data-theme="light"] {
    --bg-primary: #f8f7f4;
    --bg-secondary: #ffffff;
    --bg-surface: #eceae5;
    --bg-glass: rgba(255, 255, 255, 0.92);
    --bg-modal: rgba(248, 247, 244, 0.97);

    --text-main: #0e0e10;
    --text-muted: #5c5c66;
    --text-subtle: #8c8c96;

    --accent-gold: #b89028;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-light: rgba(0, 0, 0, 0.16);
    --border-gold: rgba(184, 144, 40, 0.35);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    background-color: var(--bg-primary);
    color: var(--text-main);
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-body);
    font-weight: 300;
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; outline: none; }

/* ==========================================================================
   1. SITE HEADER (Clean Single-Line Layout)
   ========================================================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background-color: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    box-sizing: border-box;
}

.header-container {
    max-width: 1400px;
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-sizing: border-box;
}

.site-brand {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--text-main);
    text-transform: uppercase;
    white-space: nowrap;
    text-decoration: none;
    opacity: 0.9;
}

.desktop-nav {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.desktop-nav-link {
    font-size: 0.84rem;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    text-transform: uppercase;
    text-decoration: none;
    padding: 4px 0;
    transition: color var(--transition-fast);
}

.desktop-nav-link:hover,
.desktop-nav-link.active {
    color: var(--text-main);
    font-weight: 400;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-nav-book {
    border: 1px solid var(--border-gold);
    color: var(--accent-gold);
    background-color: var(--accent-gold-glow);
    padding: 6px 18px;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border-radius: 20px;
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.btn-nav-book:hover {
    background-color: var(--accent-gold);
    color: #000;
}

.btn-theme-toggle {
    color: var(--text-muted);
    font-size: 1rem;
    padding: 5px 9px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    background: none;
}

.btn-mobile-menu {
    display: none;
    font-size: 1.2rem;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 4px 10px;
    border-radius: 4px;
    background-color: var(--bg-surface);
    cursor: pointer;
    line-height: 1;
}

/* ==========================================================================
   2. ISOLATED MOBILE DRAWER
   ========================================================================== */
.mobile-drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1500;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-smooth), visibility var(--transition-smooth);
}

.mobile-drawer-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.mobile-drawer {
    position: fixed;
    top: 0;
    right: -320px;
    width: 280px;
    height: 100vh;
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    z-index: 1600;
    padding: 24px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    gap: 20px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: right var(--transition-smooth), opacity var(--transition-smooth), visibility var(--transition-smooth);
}

.mobile-drawer.active {
    right: 0;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.drawer-close-btn {
    align-self: flex-end;
    font-size: 1.4rem;
    color: var(--text-muted);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.drawer-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--accent-gold);
    margin-bottom: 10px;
}

.drawer-nav-link {
    font-size: 1rem;
    color: var(--text-muted);
    text-decoration: none;
    padding: 10px 0;
    border-bottom: 1px dashed var(--border-color);
}

.drawer-nav-link.active, .drawer-nav-link:hover {
    color: var(--text-main);
}

.drawer-footer-info {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* ==========================================================================
   3. HERO & CATEGORY FILTER
   ========================================================================== */
.hero {
    margin-top: var(--nav-height);
    padding: 36px 20px 16px 20px;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-tagline {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    margin-bottom: 20px;
    color: var(--text-main);
    text-align: center;
}

.category-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 24px;
    width: 100%;
}

.filter-btn {
    padding: 7px 20px;
    font-size: 0.82rem;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    transition: all var(--transition-fast);
}

.filter-btn:hover { color: var(--text-main); }
.filter-btn.active {
    color: #000;
    background-color: var(--accent-gold);
    border-color: var(--accent-gold);
    font-weight: 500;
}

/* ==========================================================================
   4. GALLERY GRID & ALBUM CARDS
   ========================================================================== */
.gallery-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 24px 80px 24px;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.album-card {
    position: relative;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.album-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-gold);
}

.album-cover-wrapper {
    position: relative;
    width: 100%;
    height: 380px;
    overflow: hidden;
    background-color: var(--bg-surface);
    cursor: pointer;
}

.album-cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s var(--transition-smooth);
}

.album-card:hover .album-cover-img {
    transform: scale(1.04);
}

.album-badge {
    position: absolute;
    top: 14px;
    left: 14px;
    background-color: rgba(5, 5, 7, 0.85);
    backdrop-filter: blur(8px);
    color: var(--accent-gold);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    padding: 4px 10px;
    border-radius: 12px;
    border: 1px solid var(--border-gold);
    z-index: 2;
}

.album-info {
    padding: 16px 20px;
}

.album-category {
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    color: var(--accent-gold);
    margin-bottom: 4px;
    text-transform: uppercase;
}

.album-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 400;
    color: var(--text-main);
    line-height: 1.3;
}

.album-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
    font-size: 0.78rem;
    color: var(--text-subtle);
}

/* ==========================================================================
   5. LIGHTBOX MODAL
   ========================================================================== */
.lightbox-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-modal);
    backdrop-filter: blur(20px);
    z-index: 2000;
    display: none;
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.lightbox-modal.active {
    display: flex;
    flex-direction: column;
    opacity: 1;
}

.lightbox-header {
    height: 56px;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.lightbox-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    color: var(--text-main);
}

.lightbox-counter {
    font-size: 0.82rem;
    color: var(--accent-gold);
}

.lightbox-body {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 20px;
    user-select: none;
}

.lightbox-img-wrapper {
    max-width: 92%;
    max-height: 84vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-img {
    max-width: 100%;
    max-height: 84vh;
    object-fit: contain;
    border-radius: 4px;
}

.lightbox-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    background-color: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-main);
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

/* ==========================================================================
   6. BOOKING MODAL (Zero Overflow & Strict Tab Hiding)
   ========================================================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 2500;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px 16px;
    box-sizing: border-box;
    overflow-y: auto;
}

.modal-overlay.active { display: flex; }

.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-gold);
    border-radius: 12px;
    width: 100%;
    max-width: 500px;
    max-height: 85vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 20px 22px;
    position: relative;
    box-shadow: 0 24px 70px rgba(0,0,0,0.85);
    box-sizing: border-box;
    margin: auto;
}

.modal-drag-handle {
    width: 38px;
    height: 4px;
    background-color: var(--border-light);
    border-radius: 2px;
    margin: -4px auto 14px auto;
    display: none;
}

.modal-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    color: var(--text-main);
}

.modal-close-btn {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close-btn:hover {
    color: var(--text-main);
    border-color: var(--border-light);
}

.modal-segmented-tabs {
    display: flex;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 3px;
    margin-bottom: 14px;
}

.modal-tab-btn {
    flex: 1;
    padding: 7px 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-radius: 20px;
    text-align: center;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.modal-tab-btn.active {
    background-color: var(--accent-gold);
    color: #000;
    font-weight: 600;
}

/* Strict Tab Hiding Protection */
.modal-tab-pane {
    display: none !important;
}

.modal-tab-pane.active {
    display: block !important;
}

.inquiry-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 10px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form-group.full { grid-column: span 2; }

.form-label {
    font-size: 0.74rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 9px 12px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-main);
    font-size: 0.86rem;
    outline: none;
    box-sizing: border-box;
    transition: border-color var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--accent-gold);
}

input[type="date"] {
    color-scheme: dark;
    color: var(--text-main);
    cursor: pointer;
}

input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(0.8) sepia(100%) saturate(400%) hue-rotate(15deg);
    cursor: pointer;
}

.captcha-group {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.btn-refresh-captcha {
    padding: 10px 14px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--accent-gold);
    border-radius: 6px;
    font-size: 0.82rem;
    cursor: pointer;
    white-space: nowrap;
}

.modal-btn-group {
    display: flex;
    gap: 10px;
    margin-top: 16px;
}

.form-submit-btn {
    flex: 2;
    padding: 12px;
    background-color: var(--accent-gold);
    color: #000;
    font-weight: 600;
    letter-spacing: 0.06em;
    font-size: 0.88rem;
    border-radius: 6px;
    transition: background-color var(--transition-fast);
}

.form-submit-btn:hover {
    background-color: var(--accent-gold-light);
}

.form-cancel-btn {
    flex: 1;
    padding: 12px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.86rem;
    border-radius: 6px;
    text-align: center;
}

.wechat-direct-pane {
    text-align: center;
    padding: 10px 0 6px 0;
}

.wechat-qr-big {
    width: 140px;
    height: 140px;
    border-radius: 8px;
    border: 1px solid var(--border-gold);
    margin: 0 auto 14px auto;
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.wechat-id-badge {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 6px 14px;
    border-radius: 20px;
    display: inline-block;
    font-size: 0.88rem;
    color: var(--accent-gold);
    margin-bottom: 14px;
}

.copy-wechat-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--accent-gold);
    color: #000;
    font-weight: 600;
    border-radius: 6px;
    font-size: 0.88rem;
    letter-spacing: 0.05em;
}

/* ==========================================================================
   7. FOOTER & MOBILE BAR
   ========================================================================== */
.footer {
    margin-top: auto;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 32px 20px;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-subtle);
}

.mobile-bottom-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100vw;
    height: 60px;
    background-color: rgba(17, 17, 20, 0.96);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--border-gold);
    z-index: 990;
    padding: 8px 14px;
    box-sizing: border-box;
}

.mobile-bottom-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    height: 100%;
}

.mobile-bar-btn {
    flex: 1;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.84rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    border-radius: 22px;
}

.mobile-bar-btn.primary { background-color: var(--accent-gold); color: #000; font-weight: 600; }
.mobile-bar-btn.secondary { background-color: var(--bg-surface); color: var(--text-main); border: 1px solid var(--border-color); }

/* ==========================================================================
   8. RESPONSIVE BREAKPOINTS (Zero Collision)
   ========================================================================== */
@media (max-width: 768px) {
    body { padding-bottom: 64px; }
    
    .desktop-nav,
    .btn-nav-book {
        display: none !important;
    }

    .btn-mobile-menu {
        display: block !important;
    }

    .hero {
        margin-top: var(--nav-height);
        padding: 24px 16px 12px 16px;
    }

    .hero-tagline {
        font-size: 1.3rem;
        margin-bottom: 14px;
    }

    .category-filter {
        justify-content: flex-start;
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 8px;
        margin-bottom: 20px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .category-filter::-webkit-scrollbar { display: none; }
    .filter-btn { flex-shrink: 0; padding: 6px 16px; font-size: 0.8rem; }

    .gallery-container { padding: 0 16px 40px 16px; }
    .gallery-grid { grid-template-columns: 1fr; gap: 20px; }
    .album-cover-wrapper { height: 280px; }

    .mobile-bottom-bar { display: block; }

    /* Mobile Bottom Sheet Transformation */
    .modal-overlay {
        align-items: flex-end;
        padding: 0;
    }

    .modal-content {
        border-radius: 18px 18px 0 0;
        max-height: 82vh;
        padding: 18px 16px 26px 16px;
        border-bottom: none;
        animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

    .modal-drag-handle {
        display: block;
    }

    .inquiry-grid { grid-template-columns: 1fr; }
    .form-group.full { grid-column: span 1; }

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

/* Fallback Legacy Aliases for Stale Browser Cache Protection */
.navbar, .nav-links, .mobile-nav-drawer, .drawer-overlay {
    display: none !important;
}