:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --secondary-color: #64748B;
    --danger-color: #EF4444;
    --danger-hover: #DC2626;
    --success-color: #10B981;
    
    --bg-color: #F8FAFC;
    --surface-color: #FFFFFF;
    
    --text-main: #0F172A;
    --text-muted: #64748B;
    
    --border-color: #E2E8F0;
    --border-light: #F1F5F9;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    --border-radius: 8px;
    
    --floor2-color: #f3f4f6;
    --floor3-color: #d1fae5;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
}

/* Utilities */
.hidden { display: none !important; }
.active { display: block; }
.w-100 { width: 100%; }
.w-50 { width: calc(50% - 10px); }
.w-33 { width: calc(33.33% - 10px); }
.mt-10 { margin-top: 10px; }
.align-center { align-items: center; }

/* Buttons */
button {
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    border: none;
    border-radius: var(--border-radius);
    padding: 10px 16px;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}
.btn-primary:hover { background-color: var(--primary-hover); }

.btn-secondary {
    background-color: white;
    color: var(--text-main);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover { background-color: var(--border-light); }

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}
.btn-danger:hover { background-color: var(--danger-hover); }

.btn-danger-outline {
    background-color: transparent;
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}
.btn-danger-outline:hover {
    background-color: var(--danger-color);
    color: white;
}

.btn-nav {
    background-color: transparent;
    color: var(--text-muted);
    padding: 8px 12px;
}
.btn-nav:hover { background-color: var(--border-light); color: var(--text-main); }
.btn-nav.active {
    background-color: var(--primary-color);
    color: white;
}

.btn-icon {
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 4px 10px;
    border-radius: 4px;
    color: var(--text-main);
}
.btn-icon:hover { background: var(--border-light); }

/* AUTH SCREEN */
#auth-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #e0e7ff 0%, #f3e8ff 100%);
}

.auth-glass-panel {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 30px;
    letter-spacing: 2px;
}

.auth-glass-panel h2 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: var(--text-main);
}

.auth-switch {
    margin-top: 20px;
    font-size: 0.875rem;
    color: var(--text-muted);
}
.auth-switch a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}
.auth-switch a:hover { text-decoration: underline; }

/* FORMS */
.form-group {
    margin-bottom: 15px;
    text-align: left;
}
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
}
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
}
.form-row {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

/* NAVBAR */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 24px;
    background-color: var(--surface-color);
    box-shadow: var(--shadow-sm);
}
.nav-brand {
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 1px;
    font-size: 1.1rem;
}
.nav-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}
.user-badge {
    font-size: 0.85rem;
    background: var(--border-light);
    padding: 4px 10px;
    border-radius: 20px;
    color: var(--text-muted);
    font-weight: 500;
}
.month-selector {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    margin-right: 15px;
}

/* MAIN CONTAINERS */
.views-container {
    padding: 24px;
    max-width: 1400px;
    margin: 0 auto;
}
.panel {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: 20px;
}
.panel h2 {
    font-size: 1.25rem;
    margin-bottom: 20px;
}
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

/* TIMELINE GRID */
.grid-wrapper {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    overflow-x: auto;
    position: relative;
    padding-bottom: 10px;
}
.timeline-grid {
    border-collapse: collapse;
    width: 100%;
    min-width: 1200px; /* Force horizontal scroll */
}
.timeline-grid th, .timeline-grid td {
    border: 1px solid var(--border-color);
    padding: 8px;
    text-align: center;
}
.timeline-grid thead th {
    background-color: var(--bg-color);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-muted);
    min-width: 50px;
}
.timeline-grid thead th.weekend {
    background-color: #fee2e2;
    color: var(--danger-color);
}
.timeline-grid tbody td {
    height: 60px;
    position: relative; /* Crucial for absolute positioning of bookings */
}
.room-cell {
    position: sticky;
    left: 0;
    background-color: var(--surface-color) !important;
    font-weight: 600;
    text-align: left !important;
    padding-left: 15px !important;
    min-width: 150px;
    z-index: 10;
    box-shadow: 2px 0 5px rgba(0,0,0,0.05);
}
.floor-badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    margin-right: 8px;
}
.bg-f2 { background-color: var(--floor2-color); color: #374151; }
.bg-f3 { background-color: var(--floor3-color); color: #065f46; }

/* Bookings on timeline */
.booking-block {
    position: absolute;
    top: 5px;
    bottom: 5px;
    border-radius: 6px;
    color: white;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 4px 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    z-index: 5;
    transition: transform 0.1s, box-shadow 0.1s;
    text-align: left;
}
.booking-block:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    z-index: 6;
}
.status-paid { background-color: var(--success-color); }
.status-debt { background-color: var(--danger-color); }
.status-reserved {
    background-color: transparent;
    color: var(--text-main);
    border: 2px dashed var(--primary-color);
}
.status-reserved:hover {
    background-color: var(--border-light);
}
.b-title {
    font-weight: 600;
}
.b-subtitle {
    font-size: 0.7rem;
    opacity: 0.9;
}

/* Empty cell hover for booking */
.timeline-grid tbody td:not(.room-cell):hover {
    background-color: var(--border-light);
    cursor: pointer;
}

/* DATA TABLES (Users / Reports) */
.data-table {
    width: 100%;
    border-collapse: collapse;
}
.data-table th, .data-table td {
    border-bottom: 1px solid var(--border-color);
    padding: 12px 16px;
    text-align: left;
    font-size: 0.9rem;
}
.data-table th {
    background-color: var(--bg-color);
    font-weight: 600;
    color: var(--text-muted);
}
.data-table tbody tr:hover {
    background-color: var(--border-light);
}
.status-badge {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-pending { background: #fef3c7; color: #92400e; }
.badge-active { background: #d1fae5; color: #065f46; }

/* REPORT SPECIFIC */
.report-wrapper {
    overflow-x: auto;
}
.report-table th, .report-table td {
    text-align: center;
    border: 1px solid var(--border-color);
}
.report-table thead th {
    background-color: var(--bg-color);
}
.report-input {
    width: 70px;
    padding: 4px;
    border: 1px solid transparent;
    background: transparent;
    text-align: center;
    font-weight: bold;
    color: var(--danger-color);
}
.report-input:hover { border: 1px dashed #ccc; }
.report-input:focus {
    border: 1px solid var(--primary-color);
    background: white;
    outline: none;
}
/* hide spin buttons */
.report-input::-webkit-outer-spin-button,
.report-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.report-input[type=number] {
    -moz-appearance: textfield;
}

/* Expenses List */
.expense-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-items: center;
}
.exp-badge {
    background: #fee2e2;
    color: #991b1b;
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    white-space: nowrap;
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
}
.btn-add-exp {
    background: var(--surface-color);
    border: 1px dashed var(--border-color);
    color: var(--text-muted);
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 4px;
}
.btn-add-exp:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* MODALS */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal {
    background: var(--surface-color);
    border-radius: 12px;
    width: 100%;
    max-width: 600px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}
.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-header h2 {
    font-size: 1.25rem;
}
.btn-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    padding: 0;
    line-height: 1;
}
.btn-close:hover { color: var(--danger-color); }
.modal-body {
    padding: 24px;
    max-height: 70vh;
    overflow-y: auto;
}
.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    background: var(--bg-color);
}
.right-buttons {
    display: flex;
    gap: 10px;
    margin-left: auto;
}
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-weight: 500;
}