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

:root {
    --color-free: #10b981;
    --color-free-bg: #ecfdf5;
    --color-medium: #f59e0b;
    --color-medium-bg: #fffbeb;
    --color-busy: #ef4444;
    --color-busy-bg: #fef2f2;
    --color-none: #94a3b8;
    --color-none-bg: #f8fafc;
    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-border: #e2e8f0;
    --radius: 12px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--color-text);
    min-height: 100vh;
    background: #f1f5f9;
    overflow-x: hidden;
}

.bg-gradient {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at 20% 0%, rgba(99,102,241,0.1), transparent 50%),
        radial-gradient(circle at 80% 100%, rgba(168,85,247,0.1), transparent 50%),
        linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    z-index: -1;
}

.app-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: white;
    border-right: 1px solid var(--color-border);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header .logo {
    font-size: 1.4em;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 4px;
}

.sidebar-header .last-update {
    font-size: 0.8em;
    color: var(--color-text-light);
}

.filters {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.filter-group label {
    display: block;
    font-size: 0.85em;
    font-weight: 600;
    color: var(--color-text-light);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.filter-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 0.95em;
    background: white;
    color: var(--color-text);
    cursor: pointer;
    transition: border-color 0.2s;
}

.filter-group select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.refresh-btn {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 12px;
    border-radius: 8px;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

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

.sidebar-footer {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

.nav-link {
    color: var(--color-text-light);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.9em;
    transition: background 0.2s;
}

.nav-link:hover {
    background: var(--color-none-bg);
    color: var(--color-text);
}

.main-content {
    padding: 30px 40px;
    max-width: 1200px;
}

.content-header {
    margin-bottom: 24px;
}

.content-header h1 {
    font-size: 2em;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}

.subtitle {
    color: var(--color-text-light);
}

.locations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 16px;
}

.card {
    background: white;
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    transition: all 0.25s ease;
    border-left: 4px solid var(--color-none);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card.status-free { border-left-color: var(--color-free); }
.card.status-medium { border-left-color: var(--color-medium); }
.card.status-busy { border-left-color: var(--color-busy); }

.card-info { flex: 1; min-width: 0; }
.card-info h3 { font-size: 1.1em; font-weight: 700; margin-bottom: 4px; }
.card-info .category {
    font-size: 0.75em;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: flex-end;
}

.card-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 100px;
    font-size: 0.85em;
    font-weight: 600;
    white-space: nowrap;
}

.card.status-free .card-status { background: var(--color-free-bg); color: var(--color-free); }
.card.status-medium .card-status { background: var(--color-medium-bg); color: var(--color-medium); }
.card.status-busy .card-status { background: var(--color-busy-bg); color: var(--color-busy); }
.card.status-none .card-status { background: var(--color-none-bg); color: var(--color-none); }

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: currentColor;
}

.checkin-btn {
    background: rgba(99,102,241,0.1);
    color: var(--color-primary);
    border: 1px solid rgba(99,102,241,0.3);
    border-radius: 100px;
    padding: 6px 12px;
    font-size: 0.85em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

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

.loading, .empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-light);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    margin: 0 auto 16px;
    animation: spin 0.8s linear infinite;
}

.error {
    grid-column: 1 / -1;
    background: #fef2f2;
    color: var(--color-busy);
    padding: 24px;
    border-radius: var(--radius);
    text-align: center;
    border: 1px solid #fecaca;
}

.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal.active { display: flex; }

.modal-content {
    background: white;
    border-radius: 20px;
    padding: 28px;
    max-width: 420px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    animation: slideUp 0.3s ease-out;
}

.modal-content h3 { font-size: 1.3em; margin-bottom: 8px; }
.modal-location { color: var(--color-text-light); margin-bottom: 20px; }

.modal-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.level-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border: 2px solid transparent;
    border-radius: 12px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    background: #f8fafc;
    text-align: left;
    transition: all 0.2s;
}

.level-btn .level-icon { font-size: 1.4em; }
.level-btn.level-free:hover { background: var(--color-free-bg); border-color: var(--color-free); }
.level-btn.level-medium:hover { background: var(--color-medium-bg); border-color: var(--color-medium); }
.level-btn.level-busy:hover { background: var(--color-busy-bg); border-color: var(--color-busy); }

.modal-cancel {
    width: 100%;
    background: transparent;
    color: var(--color-text-light);
    border: none;
    padding: 12px;
    font-size: 0.95em;
    cursor: pointer;
    border-radius: 12px;
}

.modal-cancel:hover { background: #f1f5f9; }

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--color-text);
    color: white;
    padding: 14px 24px;
    border-radius: 100px;
    font-weight: 600;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    z-index: 2000;
    opacity: 0;
    transition: all 0.3s ease;
}

.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
.toast.success { background: var(--color-free); }
.toast.error { background: var(--color-busy); }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@media (max-width: 768px) {
    .app-layout { grid-template-columns: 1fr; }
    .sidebar {
        position: static;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }
    .main-content { padding: 20px 16px; }
    .content-header h1 { font-size: 1.5em; }
    .locations-grid { grid-template-columns: 1fr; }
}