@font-face {
            font-family: 'Austrian';
            src: url('../../fonts/Austrian-lgqaV.ttf') format('truetype');
            font-weight: normal;
            font-style: normal;
            font-display: swap;
        }
        :root {
            --bg-primary: #f8fafc;
            --bg-header-start: rgba(255, 255, 255, 0.30);
            --bg-header-end: rgba(255, 255, 255, 0.40);
            --bg-content-start: rgba(248, 250, 252, 0.85);
            --bg-content-end: rgba(248, 250, 252, 0.85);
            --bg-sidebar-overlay: rgba(255, 255, 255, 0.25);
            --bg-sidebar: rgba(255, 255, 255, 0.85);
            --bg-card: rgba(255, 255, 255, 0.10);
            --bg-card-semi: rgba(255, 255, 255, 0.10);
            --bg-card-transparent: rgba(255, 255, 255, 0.10);
            --bg-card-alt: rgba(255, 255, 255, 0.10);
            
            --text-main: #333333;
            --text-secondary: #475569;
            --text-card-body: #334155;
            --text-card-body-darker: #1e293b;
            --text-accent: #0891b2;
            --text-accent-dark: #0e7490;
            --text-nav: #475569;
            --text-nav-hover: #0891b2;
            
            --nav-bg: transparent;
            --nav-bg-hover: rgba(15, 118, 110, 0.08);
            --nav-border: transparent;
            --nav-border-hover: transparent;
            
            --border-card: rgba(255, 255, 255, 0.3);
            --border-sidebar: rgba(0, 0, 0, 0.06);
            --border-route: #06b6d4;
            --border-route-hover: #0891b2;
            
            --shadow-sm: 0 4px 6px rgba(0,0,0,0.02);
            --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            --header-title-shadow: 0 0 15px rgba(255, 255, 255, 1), 0 0 30px rgba(255, 255, 255, 0.8), 0 2px 4px rgba(255, 255, 255, 0.9);
            
            --bg-logo-circle: rgba(255, 255, 255, 1);
            --size-logo-circle: 132px;
            
            --header-title-color: #1e3a8a; /* Azul marino oscuro */
            --header-slogan-color: #630f19; /* Burdeo oscuro */
        }

        html.dark-mode {
            color-scheme: dark;
            --bg-primary: #0f172a;
            --bg-header-start: rgba(15, 23, 42, 0.65);
            --bg-header-end: rgba(15, 23, 42, 0.75);
            --bg-content-start: rgba(15, 23, 42, 0.85);
            --bg-content-end: rgba(15, 23, 42, 0.90);
            --bg-sidebar-overlay: rgba(0, 0, 0, 0.4);
            --bg-sidebar: rgba(15, 23, 42, 0.75);
            --bg-card: rgba(30, 41, 59, 0.20);
            --bg-card-semi: rgba(30, 41, 59, 0.20);
            --bg-card-transparent: rgba(30, 41, 59, 0.20);
            --bg-card-alt: rgba(30, 41, 59, 0.20);
            
            --text-main: #f8fafc;
            --text-secondary: #94a3b8;
            --text-card-body: #cbd5e1;
            --text-card-body-darker: #f1f5f9;
            --text-accent: #22d3ee;
            --text-accent-dark: #06b6d4;
            --text-nav: #cbd5e1;
            --text-nav-hover: #22d3ee;
            
            --nav-bg: transparent;
            --nav-bg-hover: rgba(94, 234, 212, 0.1);
            --nav-border: transparent;
            --nav-border-hover: transparent;
            
            --border-card: rgba(255, 255, 255, 0.1);
            --border-sidebar: rgba(255, 255, 255, 0.08);
            --border-route: #0891b2;
            --border-route-hover: #06b6d4;
            
            --shadow-sm: 0 4px 6px rgba(0,0,0,0.2);
            --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
            --header-title-shadow: 0 2px 4px rgba(0,0,0,0.5);
            
            --bg-logo-circle: rgba(255, 255, 255, 0.3);
            --size-logo-circle: 132px;
            
            --header-title-color: #93c5fd; /* Azul clarito para contraste de noche */
            --header-slogan-color: #fda4af; /* Rosa suave para contraste de noche */
        }

        body {
            font-family: 'Montserrat', sans-serif;
            margin: 0;
            padding: 0;
            background-color: var(--bg-primary);
            color: var(--text-main);
            height: 100vh;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        /* Top Header */
        .main-header {
            background-image: linear-gradient(var(--bg-header-start), var(--bg-header-end)), url('../../images/explanada_para_web_2.jpg?v=2');
            background-repeat: no-repeat;
            background-size: cover;
            background-position: center;
            padding: 0.5rem 2.5rem;
            box-shadow: var(--shadow-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 20;
            position: sticky;
            top: 0;
            border-bottom: 1px solid rgba(15, 118, 110, 0.1);
            transition: background-image 0.3s ease;
        }

        .main-header h1 {
            margin: -1.5rem 0 0 0;
            font-size: 5.8rem;
            color: var(--header-title-color);
            font-family: 'Austrian', cursive;
            font-weight: 400;
            letter-spacing: 1px;
            text-transform: none;
            text-shadow: var(--header-title-shadow);
            transition: color 0.3s ease, text-shadow 0.3s ease;
        }
        
        /* Layout Structure */
        .layout-container {
            display: flex;
            flex: 1;
            overflow: hidden;
        }

        /* Sidebar Styles */
        .sidebar {
            width: 280px;
            background-image: linear-gradient(var(--bg-sidebar), var(--bg-sidebar)), url('../../images/sidebar_waves.jpg');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-right: 1px solid var(--border-sidebar);
            display: flex;
            flex-direction: column;
            box-shadow: 4px 0 24px rgba(0,0,0,0.03);
            z-index: 10;
            transition: all 0.3s ease;
            overflow-y: auto;
            -webkit-overflow-scrolling: touch;
        }

        .sidebar-header {
            padding: 2.5rem 1.5rem;
            text-align: center;
            border-bottom: 1px solid var(--border-sidebar);
            background-color: transparent;
            transition: background-color 0.3s ease;
        }

        .sidebar-header h2 {
            margin: 0;
            font-size: 1.8rem;
            letter-spacing: 2px;
            color: #fefce8;
            -webkit-text-stroke: 1px #047857;
            text-shadow: 
                0 0 5px #fefce8,
                0 0 10px #d9f99d,
                0 0 20px #bef264,
                0 0 40px #84cc16;
            line-height: 1.2;
            font-weight: 700;
            font-family: 'Quicksand', 'Nunito', 'Segoe UI', sans-serif;
            text-transform: lowercase;
        }
        
        .sidebar-header span {
            display: block;
            margin-top: 0.5rem;
            font-size: 0.95rem;
            color: #d9f99d;
            -webkit-text-stroke: 0.5px #047857;
            text-shadow: 0 0 10px #84cc16;
            letter-spacing: 1px;
            font-weight: 600;
        }

        .nav-menu {
            padding: 2rem 1.2rem;
            display: flex;
            flex-direction: column;
            gap: 0.4rem;
            flex-shrink: 0;
            padding-bottom: 4rem;
        }

        .nav-link {
            color: var(--header-title-color);
            text-decoration: none;
            padding: 0.8rem 1.2rem;
            font-size: 1.1rem;
            font-weight: 600;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            border-radius: 12px;
            display: flex;
            align-items: center;
            font-weight: 500;
            background-color: var(--nav-bg);
            border: 1px solid var(--nav-border);
        }

        .nav-link:hover, .nav-link.active {
            background-color: var(--nav-bg-hover);
            color: var(--header-title-color);
            transform: translateX(6px);
            border-color: var(--nav-border-hover);
            opacity: 0.8;
        }

        .sidebar-footer {
            padding: 1.5rem;
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-secondary);
            border-top: 1px solid var(--border-sidebar);
            display: flex;
            flex-direction: column;
            gap: 1rem;
            align-items: center;
        }

        .controls {
            display: flex;
            gap: 1rem;
            align-items: center;
            justify-content: center;
        }

        .btn-icon {
            background: transparent;
            border: none;
            font-size: 1.8rem;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            color: var(--text-nav);
            text-decoration: none;
            transition: all 0.25s ease;
            padding: 0.2rem;
        }

        .btn-icon:hover {
            transform: translateY(-3px) scale(1.1);
        }

        .sidebar-footer a:hover {
            color: var(--text-nav-hover) !important;
        }

        /* Main Content Styles */
        .content-wrapper {
            flex: 1;
            display: flex;
            flex-direction: column;
            background-image: linear-gradient(var(--bg-content-start), var(--bg-content-end)), url('../../images/explanada.jpg');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            transition: background-image 0.3s ease;
            overflow-y: auto;
        }

        main {
            flex: 1;
            padding: 2.5rem;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        /* Shared Components */
        .btn {
            background-color: #06b6d4;
            color: #fff;
            padding: 12px 28px;
            font-size: 1.1rem;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            text-decoration: none;
            transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            font-weight: bold;
            display: inline-block;
            text-align: center;
        }

        .btn:hover {
            background-color: #0891b2;
            transform: translateY(-2px);
            box-shadow: 0 6px 10px rgba(0, 0, 0, 0.15);
        }

        /* Mobile Adjustments */
        #mobile-menu-btn {
            display: none;
            position: absolute;
            top: 1.5rem;
            left: 1.5rem;
            background: transparent;
            border: none;
            font-size: 2.2rem;
            color: var(--text-accent);
            cursor: pointer;
            z-index: 30;
            transition: color 0.3s ease;
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background: var(--bg-sidebar-overlay);
            backdrop-filter: blur(4px);
            z-index: 8;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        
        .sidebar-overlay.active {
            display: block;
            opacity: 1;
        }

        .logo-container {
            position: absolute; left: 140px; transform: translateX(-50%); display: flex; align-items: center;
        }

        .controls-container {
            position: absolute; right: 2.5rem; bottom: 0.1rem; display: flex; gap: 0.8rem;
        }

        @media (max-width: 900px) {
            #mobile-menu-btn { display: block; }
            .layout-container { flex-direction: column; }
            .sidebar {
                position: fixed;
                left: -300px;
                top: 0;
                height: 100vh;
                height: -webkit-fill-available;
                width: 280px;
                z-index: 9999;
                transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
                overflow-y: auto !important;
                -webkit-overflow-scrolling: touch !important;
                display: block !important; /* Overrides flexbox to guarantee scroll on iOS */
            }
            :root {
                --size-logo-circle: 92px;
            }
            html.dark-mode {
                --size-logo-circle: 92px;
            }
            .sidebar.mobile-open { left: 0; }
            .main-header {
                padding: 0.5rem 1rem;
                flex-direction: column;
                justify-content: flex-start;
            }
            .logo-container {
                position: static;
                transform: none;
                margin-bottom: 0.2rem;
                margin-top: 0;
            }
            .logo-container img {
                height: 90px !important;
            }
            .main-header h1 {
                font-size: 3.5rem;
                text-align: center;
                margin: -0.5rem 0 0 0;
            }
            .main-header p {
                font-size: 0.9rem !important;
                text-align: center;
            }
            .controls-container {
                position: static;
                margin-top: 1rem;
                justify-content: center;
                flex-wrap: wrap;
            }
            main { padding: 1rem; }
        }
        
        /* Photo Grid & Lightbox CSS */
        .photo-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            padding: 20px 0;
            width: 100%;
        }
        .photo-grid-item {
            width: 100%;
            height: 220px;
            object-fit: cover;
            border-radius: 10px;
            cursor: pointer;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            box-shadow: var(--shadow-sm);
        }
        .photo-grid-item:hover {
            transform: scale(1.03);
            box-shadow: var(--shadow-md);
        }
        .photo-grid-wrapper {
            position: relative;
            overflow: hidden;
            border-radius: 10px;
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            cursor: pointer;
            width: 100%;
            height: 220px;
        }
        .photo-grid-wrapper:hover {
            transform: scale(1.03);
            box-shadow: var(--shadow-md);
        }
        .photo-grid-wrapper .photo-grid-item {
            width: 100%;
            height: 100%;
            border-radius: 0;
            box-shadow: none;
            margin: 0;
            transition: transform 0.4s ease;
        }
        .photo-grid-wrapper:hover .photo-grid-item {
            transform: scale(1.05); /* Zoom sutil interno al hacer hover */
            box-shadow: none;
        }
        .photo-caption-hover {
            position: absolute;
            bottom: 0; left: 0; right: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.85), transparent);
            color: #f8fafc;
            padding: 40px 15px 15px 15px;
            text-align: center;
            font-size: 0.95rem;
            font-weight: 500;
            opacity: 0;
            transition: opacity 0.3s ease;
            pointer-events: none;
            text-shadow: 0 1px 2px rgba(0,0,0,0.8);
        }
        .photo-grid-wrapper:hover .photo-caption-hover {
            opacity: 1;
        }

        .lightbox {
            display: none;
            position: fixed;
            z-index: 999999;
            padding-top: 20px;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.95);
            backdrop-filter: blur(5px);
            -webkit-backdrop-filter: blur(5px);
            align-items: center;
            justify-content: center;
            flex-direction: column;
        }
        .lightbox-content {
            margin: auto;
            display: block;
            max-width: 95%;
            max-height: 85vh;
            object-fit: contain;
            border-radius: 8px;
            animation: zoomIn 0.3s ease;
        }
        .lightbox-caption {
            position: absolute;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%);
            color: #ffffff;
            font-size: 1.15rem;
            font-weight: 500;
            text-align: center;
            text-shadow: 0 2px 4px rgba(0,0,0,0.8);
            z-index: 15;
            max-width: 90%;
            background: rgba(0,0,0,0.6);
            padding: 10px 24px;
            border-radius: 30px;
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
            display: none; /* Se oculta si no hay texto */
        }
        @keyframes zoomIn {
            from {transform:scale(0.9); opacity:0;}
            to {transform:scale(1); opacity:1;}
        }
        .lightbox-close {
            position: absolute;
            top: 20px;
            right: 20px;
            color: #f1f1f1;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            z-index: 10;
            background: rgba(255,255,255,0.2);
            padding: 8px 16px;
            border-radius: 20px;
            border: 1px solid rgba(255,255,255,0.4);
            transition: all 0.3s ease;
        }
        .lightbox-close:hover {
            background: rgba(255,255,255,0.4);
        }
        .lightbox-prev, .lightbox-next {
            cursor: pointer;
            position: absolute;
            top: 50%;
            width: auto;
            padding: 16px;
            margin-top: -25px;
            color: white;
            font-weight: bold;
            font-size: 30px;
            transition: 0.3s ease;
            border-radius: 5px;
            user-select: none;
            background-color: rgba(0,0,0,0.5);
            border: none;
            z-index: 10;
        }
        .lightbox-prev:hover, .lightbox-next:hover {
            background-color: rgba(0,0,0,0.8);
        }
        .lightbox-prev { left: 20px; }
        .lightbox-next { right: 20px; }
        @media (max-width: 1000px) {
            .photo-grid { grid-template-columns: repeat(2, 1fr); }
            .photo-grid-item, .photo-grid-wrapper { height: 200px; }
        }
        @media (max-width: 600px) {
            .photo-grid { grid-template-columns: repeat(1, 1fr); }
            .photo-grid-item, .photo-grid-wrapper { height: 250px; }
            .lightbox-prev, .lightbox-next { padding: 10px; font-size: 20px; }
            .lightbox-caption { font-size: 1rem; bottom: 20px; padding: 8px 18px; }
        }