:root {
            --bg-body: #f1f5f9;
            --bg-card: #ffffff;
            --bg-header: rgba(255, 255, 255, 0.95);
            --text-main: #0f172a;
            --text-muted: #64748b;
            --border: #e2e8f0;
            --accent: #0369a1; /* Modern Corporate Blue */
            --accent-glow: rgba(3, 105, 161, 0.1);
            --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
            --glass-bg: rgba(255, 255, 255, 0.4);
            --glass-border: rgba(255, 255, 255, 0.6);
            --glass-shadow: 0 4px 20px rgba(0,0,0,0.05);
            
            --success: #10b981;
            --danger: #ef4444;
            --warning: #f59e0b;
            --teal: #0d9488;
            --teal-glow: rgba(13, 148, 136, 0.18);
        }

        [data-theme="dark"] {
            --bg-body: #020617;
            --bg-card: #0f172a;
            --bg-header: rgba(2, 6, 23, 0.9);
            --text-main: #f1f5f9;
            --text-muted: #94a3b8;
            --border: #1e293b;
            --accent: #38bdf8; /* Light Sky Blue for Dark Mode */
            --accent-glow: rgba(56, 189, 248, 0.15);
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.08);
            --glass-shadow: 0 4px 20px rgba(0,0,0,0.25);
            --teal: #2dd4bf;
            --teal-glow: rgba(45, 212, 191, 0.15);
        }

        * { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
        
        body {
            background-color: var(--bg-body);
            color: var(--text-main);
            font-family: 'Inter', sans-serif;
            transition: background 0.3s, color 0.3s;
            overflow-x: hidden;
            min-height: 100vh;
            padding-bottom: 100px;
        }

        /* Ambient Background */
        body::before {
            content: "";
            position: fixed;
            inset: 0;
            pointer-events: none;
            opacity: 0.6;
            background: 
                radial-gradient(circle at 0% 0%, var(--accent-glow) 0%, transparent 50%),
                radial-gradient(circle at 100% 100%, var(--accent-glow) 0%, transparent 50%);
            z-index: -2;
        }

        .container { max-width: 800px; margin: 0 auto; padding: 0 16px; }

        /* Header */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--bg-header);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 2px solid var(--accent);
            padding: 12px 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
        }

        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .brand-logo-container {
            background: #ffffff;
            padding: 4px;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(0,0,0,0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            overflow: hidden;
        }

        .brand-logo-container:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0,0,0,0.12);
        }

        [data-theme="dark"] .brand-logo-container {
            box-shadow: 0 4px 20px rgba(0,0,0,0.3);
            border: 1px solid rgba(255,255,255,0.1);
            background: #ffffff;
        }

        .brand-logo-img {
            max-height: 42px;
            width: auto;
            object-fit: contain;
        }
        
        @media (max-width: 767px) {
            .brand-logo-img {
                max-height: 30px;
            }
        }

        .brand-text {
            display: flex;
            flex-direction: column;
            line-height: 1;
        }

        .brand-name { font-weight: 800; font-size: 1rem; text-transform: uppercase; color: var(--text-main); }
        .brand-tagline { font-size: 0.6rem; color: var(--text-muted); font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; margin-top: 2px; }

        .header-actions {
            display: flex;
            gap: 8px;
            align-items: center;
        }

        .icon-btn {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            color: var(--text-main);
            width: 38px;
            height: 38px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s;
            font-size: 1.1rem;
        }

        .icon-btn:hover { background: var(--accent); color: white; border-color: var(--accent); }

        /* Search & Filters */
        .controls {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .controls-left {
            display: flex;
            flex-direction: column;
            gap: 10px;
            width: 100%;
        }

        .search-container {
            position: relative;
        }

        .search-input, .select-input {
            width: 100%;
            padding: 10px 16px;
            border-radius: 12px;
            border: 1px solid var(--border);
            background: var(--bg-card);
            color: var(--text-main);
            font-size: 0.9rem;
            font-weight: 600;
            outline: none;
            transition: all 0.2s;
        }

        .search-input { padding-left: 40px; }
        .search-input:focus, .select-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

        .search-icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .hotel-list {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .hotel-row {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 10px 16px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 2px 4px rgba(0,0,0,0.02);
            transition: all 0.2s;
        }

        .hotel-row:hover { border-color: var(--accent-glow); }

        .content { margin-top: 20px; }

        .zone-section {
            margin-bottom: 32px;
            background: transparent;
            border: none;
            box-shadow: none;
            padding: 0;
        }

        .zone-header {
            font-size: 1.1rem;
            font-weight: 900;
            color: var(--accent); /* Blue letters */
            text-transform: uppercase;
            letter-spacing: 1.5px;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            justify-content: flex-start; /* Left aligned without box */
            background: transparent;
            padding: 0;
            box-shadow: none;
        }

        [data-theme="dark"] .zone-header {
            background: linear-gradient(135deg, #1e3a8a, var(--accent));
            color: #ffffff;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
            padding: 14px;
            border-radius: 12px;
            justify-content: center;
        }

        .hotel-list {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .hotel-row {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 12px 16px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 2px 4px rgba(0,0,0,0.02);
            transition: transform 0.1s;
        }

        .hotel-row:active { transform: scale(0.98); }

        .hotel-info {
            display: flex;
            flex-direction: column;
        }

        .hotel-name {
            font-size: 0.9rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.3px;
        }

        .hotel-meta {
            font-size: 0.65rem;
            color: var(--text-muted);
            font-weight: 600;
        }

        .hotel-rating {
            color: #f59e0b;
            font-size: 0.72rem;
            font-weight: 800;
            white-space: nowrap;
            margin-left: 6px;
        }

        .input-group {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .room-input {
            width: 70px;
            padding: 8px;
            border-radius: 8px;
            border: 1px solid var(--border);
            background: var(--bg-body);
            color: var(--text-main);
            font-family: 'JetBrains Mono', monospace;
            font-weight: 700;
            font-size: 1.1rem;
            font-size: 1.1rem;
            text-align: center;
            outline: none;
            transition: all 0.2s;
            -moz-appearance: textfield; /* Firefox */
        }
        
        /* Chrome/Safari/Edge */
        .room-input::-webkit-outer-spin-button,
        .room-input::-webkit-inner-spin-button {
            -webkit-appearance: none;
            margin: 0;
        }

        .room-input:focus {
            border-color: var(--accent);
            background: var(--bg-card);
            box-shadow: 0 0 0 3px var(--accent-glow);
        }

        .room-input[value="0"] { color: var(--text-muted); opacity: 0.6; }
        .room-input:not([value="0"]) { color: var(--accent); }

        /* Actions Bar */
        .bottom-actions {
            position: fixed;
            bottom: 16px;
            left: 50%;
            transform: translateX(-50%);
            width: calc(100% - 32px);
            max-width: 340px;
            display: flex;
            gap: 10px;
            z-index: 900;
        }

        .btn-primary {
            flex: 1;
            padding: 11px 10px;
            border-radius: 14px;
            border: none;
            background: var(--accent);
            color: white;
            font-weight: 700;
            font-size: 0.82rem;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            cursor: pointer;
            box-shadow: 0 6px 14px rgba(37, 99, 235, 0.22);
            transition: all 0.2s;
        }

        .btn-primary:active { transform: translateY(2px); box-shadow: 0 3px 6px rgba(37, 99, 235, 0.15); }

        .btn-viva {
            background: var(--teal);
            box-shadow: 0 8px 16px var(--teal-glow);
        }

        .btn-whatsapp {
            background: #25D366;
            color: #ffffff;
            box-shadow: 0 6px 14px rgba(37, 211, 102, 0.25);
        }

        .btn-whatsapp:hover {
            background: #20bd5a;
        }

        [data-theme="dark"] .btn-primary {
            color: #02131f;
            background: #67d4ff;
            border: 1px solid rgba(186, 230, 253, 0.65);
            font-weight: 850;
            text-shadow: none;
            box-shadow: 0 10px 22px rgba(56, 189, 248, 0.22);
        }

        [data-theme="dark"] .btn-viva {
            color: #02201d;
            background: #47e0cf;
            border-color: rgba(153, 246, 228, 0.7);
            box-shadow: 0 10px 22px rgba(45, 212, 191, 0.2);
        }

        [data-theme="dark"] .btn-whatsapp {
            color: #02201d;
            background: #25D366;
            border-color: rgba(37, 211, 102, 0.7);
            box-shadow: 0 10px 22px rgba(37, 211, 102, 0.25);
        }

        [data-theme="dark"] .btn-primary span {
            filter: saturate(1.15) contrast(1.15);
        }

        /* Modal Styles */
        .modal-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            backdrop-filter: blur(8px);
            z-index: 2000;
            display: none;
            align-items: flex-end;
            justify-content: center;
        }

        .modal-overlay.active { display: flex; animation: fadeIn 0.3s; }

        .modal-content {
            background: var(--bg-body);
            width: 100%;
            max-width: 600px;
            border-radius: 24px 24px 0 0;
            padding: 24px;
            max-height: 90vh;
            overflow-y: auto;
            position: relative;
            box-shadow: 0 -10px 40px rgba(0,0,0,0.2);
            transform: translateY(100%);
            transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .modal-overlay.active .modal-content { transform: translateY(0); }

        .dialog-overlay, .modal-overlay.dialog-overlay { 
            align-items: flex-start !important; 
            padding-top: 10vh !important; 
        }
        .dialog-overlay .modal-content, .modal-overlay.dialog-overlay .modal-content { 
            border-radius: 24px !important; 
            margin: 0 auto !important; 
            width: calc(100% - 32px) !important; 
            max-width: 360px !important; 
            transform: translateY(-20px) !important; 
            opacity: 0 !important; 
            box-shadow: 0 15px 50px rgba(0,0,0,0.6) !important;
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1) !important; 
        }
        .dialog-overlay.active .modal-content, .modal-overlay.dialog-overlay.active .modal-content { 
            transform: translateY(0) !important; 
            opacity: 1 !important; 
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            position: sticky;
            top: 0;
            background: var(--bg-body);
            z-index: 10;
            padding-bottom: 10px;
        }

        .modal-title { font-weight: 800; font-size: 1.2rem; }

        .close-modal {
            background: var(--border);
            border: none;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 1.2rem;
            color: var(--text-main);
        }

        /* Settings Specific */
        .settings-section { margin-bottom: 24px; }
        .settings-title { font-size: 0.8rem; font-weight: 800; text-transform: uppercase; color: var(--text-muted); margin-bottom: 12px; }

        .toggle-item {
            background: var(--bg-card);
            padding: 12px 16px;
            border-radius: 12px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 6px;
        }

        .toggle-name { font-size: 0.85rem; font-weight: 600; }

        /* Custom Toggle Switch */
        .switch {
            position: relative;
            display: inline-block;
            width: 44px;
            height: 24px;
        }

        .switch input { opacity: 0; width: 0; height: 0; }

        .slider {
            position: absolute;
            cursor: pointer;
            inset: 0;
            background-color: var(--border);
            transition: .3s;
            border-radius: 34px;
        }

        .slider:before {
            position: absolute;
            content: "";
            height: 18px;
            width: 18px;
            left: 3px;
            bottom: 3px;
            background-color: white;
            transition: .3s;
            border-radius: 50%;
        }

        input:checked + .slider { background-color: var(--success); }
        input:checked + .slider:before { transform: translateX(20px); }

        /* Form Controls */
        .form-group { margin-bottom: 16px; }
        .form-label { display: block; font-size: 0.75rem; font-weight: 800; text-transform: uppercase; color: var(--text-muted); margin-bottom: 6px; }
        .form-input {
            width: 100%;
            padding: 12px;
            border-radius: 12px;
            border: 1px solid var(--border);
            background: var(--bg-card);
            color: var(--text-main);
            font-size: 0.95rem;
            outline: none;
        }

        /* Viva Export Modal */
        .viva-preview {
            background: #ffffff;
            color: #1c1e21;
            padding: 20px;
            border-radius: 16px;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            font-size: 0.95rem;
            line-height: 1.4;
            white-space: pre-wrap;
            border: 1px solid #e1e4e8;
            margin-bottom: 20px;
            user-select: text;
        }

        .viva-actions {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .viva-btn {
            padding: 14px;
            border-radius: 12px;
            border: none;
            font-weight: 700;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .btn-copy { background: #f1f5f9; color: #0f172a; }
        .btn-whatsapp { background: #25d366; color: white; }

        .desktop-actions {
            display: none;
        }

        /* Animations */
        @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

        /* Responsive adjustments */
        @media (min-width: 768px) {
            /* Subtle Premium Grid Background for Desktop */
            body::after {
                content: "";
                position: fixed;
                inset: 0;
                pointer-events: none;
                z-index: -3;
                background-image: radial-gradient(var(--text-muted) 1px, transparent 1px);
                background-size: 32px 32px;
                opacity: 0.08;
                -webkit-mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
                mask-image: linear-gradient(to bottom, black 0%, transparent 100%);
            }

            .bottom-actions { display: none; } /* Hide floating bar on desktop */
            .desktop-actions { display: contents; }
            /* Restore full size for desktop action buttons */
            .desktop-actions .btn-primary {
                padding: 12px 20px;
                font-size: 0.9rem;
                font-weight: 800;
                border-radius: 16px;
                gap: 8px;
                box-shadow: 0 8px 16px rgba(37, 99, 235, 0.25);
            }
            .controls-left { display: contents; }
            .controls { 
                display: grid; 
                grid-template-columns: 1fr 310px; 
                grid-template-rows: auto auto; 
                gap: 12px 24px; 
                align-items: stretch;
            }
            .controls-left-selects { grid-column: 1; grid-row: 1; display: flex; gap: 12px; }
            .controls-left-selects .select-input { flex: 1; width: 100%; }
            .search-container { grid-column: 1; grid-row: 2; }
            .desktop-actions {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 8px;
                grid-column: 2;
                grid-row: 1 / span 2;
            }
            #btn-pdf-desktop { grid-column: 1; grid-row: 1; }
            #btn-pdf-modern-desktop { grid-column: 1; grid-row: 1; }
            #btn-wa-desktop { grid-column: 2; grid-row: 1; }
            #btn-viva-desktop { grid-column: 1 / span 2; grid-row: 2; }
            .modal-overlay { align-items: center; }
            .modal-content { border-radius: 24px; transform: translateY(40px); margin: 20px; }
            .modal-overlay.active .modal-content { transform: translateY(0); }
            
            /* Responsive Desktop Content Grid */
            .container { max-width: 1400px; padding: 0 40px; }
            
            .content { 
                display: block; 
            }
            
            .zone-section {
                background: transparent;
                border: none;
                padding: 0;
                margin-bottom: 32px;
                box-shadow: none;
            }

            .hotel-list {
                display: grid;
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }
        
        @media (min-width: 1200px) {
            .hotel-list {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (min-width: 1600px) {
            .hotel-list {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        .empty-state {
            padding: 40px 20px;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .reset-btn {
            padding: 7px 13px;
            background: transparent;
            color: var(--text-muted);
            border: 1.5px solid var(--border);
            border-radius: 10px;
            font-size: 0.72rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.4px;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .reset-btn:hover {
            background: var(--accent-glow);
            color: var(--accent);
            border-color: var(--accent);
            transform: translateY(-1px);
        }

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

        /* Polished responsive app layout */
        body {
            padding-bottom: calc(92px + env(safe-area-inset-bottom));
        }

        header {
            border-bottom: 1px solid rgba(3, 105, 161, 0.24);
        }

        .content {
            padding-top: 4px;
        }

        .search-input,
        .select-input,
        .form-input {
            min-height: 44px;
            border-radius: 10px;
        }

        .zone-section {
            margin-bottom: 30px;
        }

        .zone-header {
            position: sticky;
            top: 126px;
            z-index: 20;
            min-height: 34px;
            margin-bottom: 10px;
            padding: 8px 0;
            border-bottom: 1px solid var(--border);
            background: linear-gradient(to bottom, var(--bg-body) 72%, rgba(241, 245, 249, 0));
            font-size: 0.84rem;
            line-height: 1.25;
            letter-spacing: 0.08em;
        }

        [data-theme="dark"] .zone-header {
            top: 126px;
            justify-content: flex-start;
            background: linear-gradient(to bottom, var(--bg-body) 72%, rgba(2, 6, 23, 0));
            color: var(--accent);
            border-radius: 0;
            box-shadow: none;
            padding: 8px 0;
        }

        .hotel-list {
            gap: 9px;
        }

        .hotel-row {
            min-height: 58px;
            border-radius: 10px;
            padding: 10px 12px;
            gap: 12px;
            box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
        }

        .hotel-row:hover {
            border-color: rgba(3, 105, 161, 0.34);
            box-shadow: 0 8px 18px rgba(15, 23, 42, 0.06);
        }

        .hotel-info {
            min-width: 0;
            gap: 2px;
        }

        .hotel-name {
            line-height: 1.2;
            overflow-wrap: anywhere;
        }

        .room-input {
            width: 62px;
            min-height: 42px;
            border-radius: 10px;
            font-size: 1rem;
            background: color-mix(in srgb, var(--bg-body) 82%, var(--bg-card));
        }

        .bottom-actions {
            bottom: calc(12px + env(safe-area-inset-bottom));
            width: calc(100% - 24px);
            max-width: 430px;
            padding: 8px;
            border: 1px solid var(--glass-border);
            border-radius: 18px;
            background: var(--bg-header);
            box-shadow: 0 18px 42px rgba(15, 23, 42, 0.18);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
        }

        .btn-primary {
            min-height: 44px;
            border-radius: 12px;
            letter-spacing: 0.01em;
        }

        .modal-content {
            border: 1px solid var(--border);
        }

        @media (max-width: 767px) {
            .container {
                padding: 0 12px;
            }

            header {
                padding: 10px 0;
            }

            .header-top {
                gap: 10px;
                margin-bottom: 10px;
            }

            .brand {
                min-width: 0;
                gap: 10px;
            }

            .header-actions {
                gap: 6px;
            }

            .icon-btn {
                width: 36px;
                height: 36px;
                border-radius: 10px;
                flex: 0 0 auto;
            }

            .reset-btn {
                width: 36px;
                height: 36px;
                padding: 0;
                font-size: 1rem;
                border-radius: 10px;
                justify-content: center;
            }

            .reset-label {
                display: none;
            }

            .content {
                margin-top: 14px;
            }

            .zone-header {
                top: 136px;
            }

            [data-theme="dark"] .zone-header {
                top: 136px;
            }

            .hotel-row {
                align-items: stretch;
            }

            .input-group {
                align-items: center;
            }
        }

        @media (min-width: 768px) {
            body {
                padding-bottom: 42px;
            }

            header {
                padding: 14px 0;
            }

            .content {
                margin-top: 24px;
            }

            .zone-header {
                position: static;
                margin-bottom: 14px;
                padding-top: 0;
                background: transparent;
                font-size: 0.92rem;
            }

            [data-theme="dark"] .zone-header {
                position: static;
                background: transparent;
                color: var(--accent);
            }

            .hotel-list {
                gap: 12px;
            }

            .hotel-row {
                min-height: 64px;
                padding: 12px 14px;
            }
        }