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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.5;
}

/* Screen Management */
.screen {
    min-height: 100vh;
}

.screen.hidden {
    display: none;
}

/* Login Screen */
#login-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: #333;
    font-size: 1.5rem;
}

.login-box input {
    width: 100%;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
}

.login-box input:focus {
    outline: none;
    border-color: #667eea;
}

.login-box button {
    width: 100%;
    padding: 0.75rem;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
}

.login-box button:hover {
    background: #5a67d8;
}

.error {
    color: #dc2626;
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

/* App Header */
.app-header {
    background: white;
    border-bottom: 1px solid #e5e7eb;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-header h1 {
    font-size: 1.25rem;
    color: #333;
}

.app-header nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: #6b7280;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
}

.nav-btn:hover {
    background: #f3f4f6;
}

.nav-btn.active {
    background: #667eea;
    color: white;
}

#logout-btn {
    padding: 0.5rem 1rem;
    border: 1px solid #dc2626;
    background: transparent;
    color: #dc2626;
    cursor: pointer;
    border-radius: 6px;
    margin-left: 1rem;
}

#logout-btn:hover {
    background: #dc2626;
    color: white;
}

/* Main Content */
.app-main {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* View Management */
.view {
    display: none;
}

.view.active {
    display: block;
}

/* Dashboard */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.stat-card h3 {
    font-size: 0.875rem;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: #333;
}

.stat-label {
    font-size: 0.875rem;
    color: #9ca3af;
}

.today-list {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.today-list h2 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.reservation-item {
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid #f3f4f6;
}

.reservation-item:last-child {
    border-bottom: none;
}

.reservation-time {
    font-weight: 600;
    color: #667eea;
}

.reservation-guests {
    color: #6b7280;
}

.reservation-name {
    font-weight: 500;
}

/* Floor Plan */
.floorplan-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    align-items: center;
}

.floorplan-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    min-height: 500px;
    padding: 2rem;
    position: relative;
}

.floorplan-area {
    position: relative;
    width: 100%;
    height: 450px;
    background: #f9fafb;
    border: 2px dashed #d1d5db;
    border-radius: 8px;
}

.table {
    position: absolute;
    background: #22c55e;
    border: 2px solid #16a34a;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    color: white;
    font-weight: 600;
    user-select: none;
}

.table:hover {
    transform: scale(1.05);
}

.table.occupied {
    background: #ef4444;
    border-color: #dc2626;
}

.table.selected {
    background: #f59e0b;
    border-color: #d97706;
}

.table.merged {
    background: #8b5cf6;
    border-color: #7c3aed;
}

.table.circle {
    border-radius: 50%;
}

.floorplan-legend {
    display: flex;
    gap: 2rem;
    margin-top: 1rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.legend-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.legend-color.free { background: #22c55e; }
.legend-color.occupied { background: #ef4444; }
.legend-color.selected { background: #f59e0b; }

/* Calendar */
.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.calendar-header button {
    padding: 0.5rem 1rem;
    background: white;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    cursor: pointer;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: #e5e7eb;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    overflow: hidden;
}

.calendar-day-header {
    background: #f9fafb;
    padding: 1rem;
    text-align: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.calendar-day {
    background: white;
    min-height: 100px;
    padding: 0.5rem;
    cursor: pointer;
    transition: background 0.2s;
}

.calendar-day:hover {
    background: #f3f4f6;
}

.calendar-day.other-month {
    color: #9ca3af;
    background: #fafafa;
}

.calendar-day.today {
    background: #dbeafe;
}

.calendar-day.has-reservations::after {
    content: '';
    display: block;
    width: 6px;
    height: 6px;
    background: #ef4444;
    border-radius: 50%;
    margin-top: 4px;
}

.day-number {
    font-weight: 500;
    font-size: 0.875rem;
}

.reservation-count {
    font-size: 0.75rem;
    color: #6b7280;
    margin-top: 0.25rem;
}

/* Reservations */
.reservations-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.reservations-list {
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Settings */
.settings-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    background: transparent;
    color: #6b7280;
    cursor: pointer;
    border-bottom: 2px solid transparent;
}

.tab-btn.active {
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab-content {
    display: none;
}

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

/* Forms */
.form-row {
    margin-bottom: 1rem;
}

.form-row label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: 500;
    font-size: 0.875rem;
}

.form-row input,
.form-row select,
.form-row textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.875rem;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
    outline: none;
    border-color: #667eea;
}

/* Buttons */
.btn-primary {
    padding: 0.5rem 1rem;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: background 0.2s;
}

.btn-primary:hover {
    background: #5a67d8;
}

.btn-secondary {
    padding: 0.5rem 1rem;
    background: white;
    color: #374151;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
}

.btn-secondary:hover {
    background: #f3f4f6;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.hidden {
    display: none;
}

.modal {
    background: white;
    border-radius: 12px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal.hidden {
    display: none;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
}

.modal-header h2 {
    font-size: 1.25rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #6b7280;
}

.modal-close:hover {
    color: #333;
}

.modal form {
    padding: 1.5rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .app-header nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .floorplan-container {
        padding: 1rem;
    }
}