/* ==========================================================================
   DESIGN SYSTEM & CUSTOM STYLES: TIỆM LẨU NHÀ AN
   Theme: Warm Charcoal & Hotpot Terracotta Gold (Cozy Premium Eatery)
   ========================================================================== */

/* Google Fonts Import & Variables */
:root {
    --bg-main: #fbf9f4;
    --bg-darker: #f4eedf;
    --text-primary: #2b1b11;
    --text-secondary: #665246;
    --accent-red: #c82c0e;
    --accent-red-hover: #a32209;
    --accent-gold: #b57a1d;
    --accent-gold-hover: #936214;
    --border-light: rgba(181, 122, 29, 0.15);
    --border-hover: rgba(181, 122, 29, 0.4);
    --glass-bg: rgba(251, 249, 244, 0.85);
    --glass-bg-hover: rgba(244, 238, 223, 0.95);
    --shadow-soft: 0 10px 35px rgba(43, 27, 17, 0.08);
    --shadow-glow: 0 0 20px rgba(200, 44, 14, 0.08);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    height: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Decorative Background Glow Orbs */
.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    pointer-events: none;
    opacity: 0.45;
}

.orb-1 {
    top: 10%;
    left: -10%;
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, rgba(200, 44, 14, 0.06) 0%, rgba(200, 44, 14, 0) 70%);
}

.orb-2 {
    bottom: 20%;
    right: -10%;
    width: 45vw;
    height: 45vw;
    background: radial-gradient(circle, rgba(181, 122, 29, 0.05) 0%, rgba(181, 122, 29, 0) 70%);
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-darker);
}
::-webkit-scrollbar-thumb {
    background: #c5b6a7;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-gold);
}

/* Header & Navigation Styling */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-soft);
}

.header-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
}

.brand-logo {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-red) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(223, 153, 40, 0.1);
}

.brand-subtitle {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 1.5px;
    margin-top: 2px;
    text-transform: uppercase;
}

.main-nav {
    display: flex;
    gap: 0.75rem;
    background: rgba(43, 27, 17, 0.06);
    padding: 0.35rem;
    border-radius: 12px;
    border: 1px solid rgba(43, 27, 17, 0.08);
}

.nav-tab {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.65rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-fast);
}

.nav-tab svg {
    opacity: 0.7;
    transition: var(--transition-fast);
}

.nav-tab:hover {
    color: var(--text-primary);
    background: rgba(43, 27, 17, 0.04);
}

.nav-tab.active {
    color: #fff;
    background: linear-gradient(135deg, var(--accent-red) 0%, #b82c0a 100%);
    box-shadow: 0 4px 12px rgba(211, 66, 30, 0.3);
}

.nav-tab.active svg {
    opacity: 1;
}

/* Main Content Area */
.main-content {
    flex: 1;
    max-width: 1280px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem;
}

.content-section {
    display: none;
    animation: fadeIn var(--transition-normal);
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Buttons System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
    border: 1px solid transparent;
}

.btn-secondary {
    background: var(--glass-bg);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--glass-bg-hover);
    border-color: var(--accent-gold);
    color: var(--accent-gold);
    box-shadow: var(--shadow-glow);
}

.btn-nav {
    background: rgba(251, 249, 244, 0.9);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
    min-width: 80px;
}

.btn-nav:hover:not(:disabled) {
    background: var(--accent-red);
    border-color: var(--accent-red);
    color: white;
    box-shadow: 0 4px 10px rgba(211, 66, 30, 0.2);
}

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

/* ==========================================================================
   SECTION 1: MENU SECTION SPECIFICS
   ========================================================================== */
.menu-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

.action-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 800px;
    background: var(--glass-bg);
    padding: 0.75rem 1.25rem;
    border-radius: 12px;
    border: 1px solid var(--border-light);
}

.info-text {
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.highlight {
    color: var(--accent-gold);
    font-weight: 700;
}

/* Menu Viewer Box */
.menu-viewer-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 950px;
    gap: 1.5rem;
    position: relative;
}

.menu-image-container {
    flex: 1;
    position: relative;
    background: #ffffff;
    border-radius: 16px;
    border: 2px solid var(--border-light);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    max-height: 72vh;
    aspect-ratio: 1 / 1.414; /* Standard vertical A4 ratio */
    cursor: zoom-in;
    transition: border-color var(--transition-fast);
}

.menu-image-container:hover {
    border-color: var(--accent-gold);
}

.menu-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.3s ease;
    display: block;
    user-select: none;
    -webkit-user-drag: none;
}

/* Loading Overlay inside Menu Viewer */
.image-loader {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(251, 249, 244, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 5;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.image-loader.active {
    opacity: 1;
    pointer-events: auto;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(181, 122, 29, 0.1);
    border-left-color: var(--accent-gold);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Desktop Sidebar Nav Arrows */
.nav-arrow {
    background: var(--glass-bg);
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    width: 54px;
    height: 54px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition-fast);
    flex-shrink: 0;
    box-shadow: var(--shadow-soft);
}

.nav-arrow:hover {
    background: var(--accent-gold);
    border-color: var(--accent-gold);
    color: white;
    transform: scale(1.08);
}

.nav-arrow:disabled {
    opacity: 0.15;
    cursor: not-allowed;
    transform: none !important;
}

/* Pagination Control Panel */
.pagination-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--glass-bg);
    padding: 0.75rem 1.25rem;
    border-radius: 14px;
    border: 1px solid var(--border-light);
    max-width: 100%;
    box-shadow: var(--shadow-soft);
}

.page-select-container {
    position: relative;
    display: flex;
    align-items: center;
}

.select-page {
    background: var(--bg-darker);
    color: var(--accent-gold);
    border: 1px solid var(--border-light);
    padding: 0.55rem 1.5rem 0.55rem 1rem;
    border-radius: 8px;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    min-width: 120px;
    text-align: center;
    transition: var(--transition-fast);
}

.select-page:focus {
    border-color: var(--accent-gold);
    box-shadow: 0 0 0 2px rgba(223, 153, 40, 0.2);
}

.page-select-container::after {
    content: "";
    border: solid var(--accent-gold);
    border-width: 0 2px 2px 0;
    display: inline-block;
    padding: 3px;
    transform: rotate(45deg);
    position: absolute;
    right: 12px;
    pointer-events: none;
}

/* ==========================================================================
   SECTION 2: DECOR SECTION SPECIFICS
   ========================================================================== */
.decor-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
}

/* Branch filter tabs */
.branch-selector {
    display: flex;
    gap: 0.5rem;
    background: rgba(43, 27, 17, 0.06);
    padding: 0.4rem;
    border-radius: 12px;
    border: 1px solid var(--border-light);
}

.branch-tab {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 600;
    padding: 0.55rem 1.25rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.branch-tab:hover {
    color: var(--text-primary);
}

.branch-tab.active {
    background: var(--glass-bg-hover);
    color: var(--accent-gold);
    border: 1px solid rgba(181, 122, 29, 0.3);
    box-shadow: var(--shadow-glow);
}

/* Decor gallery grid */
.decor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    width: 100%;
    max-width: 1100px;
}

.decor-card {
    background: var(--glass-bg);
    border-radius: 14px;
    border: 1px solid var(--border-light);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-normal);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.decor-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent-gold);
    box-shadow: 0 15px 35px rgba(0,0,0,0.6), var(--shadow-glow);
}

.decor-img-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: #000;
}

.decor-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.decor-card:hover .decor-thumb {
    transform: scale(1.08);
}

.decor-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 10, 7, 0.4);
    opacity: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.3s ease;
}

.decor-overlay svg {
    color: white;
    transform: scale(0.8);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.decor-card:hover .decor-overlay {
    opacity: 1;
}

.decor-card:hover .decor-overlay svg {
    transform: scale(1);
}

.decor-info {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.decor-info h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.decor-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   LIGHTBOX MODAL & INTERACTIVE CONTROLS
   ========================================================================== */
.lightbox-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(5, 3, 2, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    display: none;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: white;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition-fast);
    z-index: 1010;
}

.lightbox-close:hover {
    background: var(--accent-red);
    border-color: var(--accent-red);
    transform: scale(1.05);
}

/* Lightbox Navigation */
.lightbox-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition-fast);
    z-index: 1005;
}

.lightbox-arrow:hover {
    background: var(--accent-gold);
    border-color: var(--accent-gold);
    color: white;
}

.lightbox-arrow-left {
    left: 30px;
}

.lightbox-arrow-right {
    right: 30px;
}

.lightbox-content {
    position: relative;
    max-width: 90%;
    max-height: 85%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.lightbox-img {
    max-width: 100%;
    max-height: 75vh;
    object-fit: contain;
    border-radius: 6px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.8);
    transition: transform 0.1s ease; /* Fluid transitions during zooming/dragging */
    cursor: grab;
}

.lightbox-img:active {
    cursor: grabbing;
}

.lightbox-caption {
    margin-top: 15px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    text-align: center;
    background: rgba(0,0,0,0.6);
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    letter-spacing: 0.5px;
}

/* Zoom controls bar */
.zoom-controls {
    position: absolute;
    bottom: 25px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(20, 15, 12, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 0.5rem 0.8rem;
    border-radius: 30px;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    z-index: 1005;
    box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.zoom-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    transition: var(--transition-fast);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 700;
}

.zoom-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent-gold);
}

/* ==========================================================================
   FOOTER BLOCK STYLING
   ========================================================================== */
.app-footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border-light);
    padding: 4rem 2rem 2rem;
    margin-top: auto;
}

.footer-grid {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.footer-col h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-gold);
    letter-spacing: 1px;
    position: relative;
    padding-bottom: 0.5rem;
}

.footer-col h4::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--accent-red);
}

.footer-col p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-col li {
    font-size: 0.88rem;
    color: var(--text-secondary);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.footer-icon {
    color: var(--accent-red);
    flex-shrink: 0;
    margin-top: 3px;
}

.footer-col li strong {
    color: var(--text-primary);
}

.branch-list li {
    align-items: flex-start !important;
    margin-bottom: 0.8rem;
}

.branch-list li div {
    display: flex;
    flex-direction: column;
}

.map-link {
    color: var(--accent-gold);
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 600;
    transition: var(--transition-fast);
    display: inline-block;
    margin-top: 3px;
}

.map-link:hover {
    color: var(--accent-red);
    text-decoration: underline;
}

.footer-bottom {
    max-width: 1280px;
    margin: 3rem auto 0;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-light);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   MEDIA QUERIES FOR RESPONSIVE BEHAVIOR
   ========================================================================== */

/* Large screens and middle-size tablets */
@media (max-width: 1024px) {
    .menu-viewer-wrapper {
        gap: 0.75rem;
    }
    
    .nav-arrow {
        width: 46px;
        height: 46px;
    }
}

/* Small tablets / Landscape mobile */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .header-container {
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
    }

    .main-nav {
        width: 100%;
        justify-content: center;
        gap: 0.4rem;
    }

    .nav-tab {
        flex: 1;
        justify-content: center;
        padding: 0.55rem 0.6rem;
        font-size: 0.85rem;
    }

    .nav-tab svg {
        display: none !important;
    }

    .main-content {
        padding: 1.25rem;
    }

    /* Hide desktop navigation side arrows on mobile and rely on swipe and footer nav buttons */
    .nav-arrow {
        display: none !important;
    }

    .menu-image-container {
        max-height: 58vh;
    }

    .action-bar {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }

    .btn-zoom {
        width: 100%;
    }

    /* Lightbox elements */
    .lightbox-arrow {
        display: none !important; /* Touch swipe works, or zoom in */
    }

    .lightbox-close {
        top: 15px;
        right: 15px;
        width: 42px;
        height: 42px;
    }

    .footer-grid {
        gap: 2rem;
    }
}

/* Small mobile portrait */
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .brand-title {
        font-size: 1.4rem;
        text-align: center;
    }

    .brand-subtitle {
        text-align: center;
    }

    .nav-tab {
        padding: 0.55rem 0.35rem;
        font-size: 0.8rem;
    }

    .menu-image-container {
        max-height: 50vh;
    }

    .pagination-controls {
        flex-wrap: wrap;
        gap: 0.4rem;
        width: 100%;
    }

    .btn-nav {
        flex: 1 1 20%;
        min-width: unset;
        font-size: 0.8rem;
        padding: 0.5rem 0.25rem;
    }

    .page-select-container {
        flex: 1 1 100%;
        order: -1; /* Place the dropdown above navigation buttons on tiny displays */
        margin-bottom: 0.25rem;
    }

    .select-page {
        width: 100%;
    }

    .decor-grid, .footer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}