/* Mobile-first design */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --warning: #ca8a04;
    --danger: #dc2626;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--gray-100);
    color: var(--gray-900);
    min-height: 100vh;
    line-height: 1.5;
}

.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 1rem;
}

/* Header */
.header {
    text-align: center;
    padding: 2rem 1rem;
    background: var(--primary);
    color: white;
    margin-bottom: 1.5rem;
    border-radius: 0 0 1rem 1rem;
}

.header h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.header p {
    opacity: 0.9;
    font-size: 0.9rem;
}

/* Cards */
.card {
    background: white;
    border-radius: 0.75rem;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--gray-700);
}

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

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--gray-200);
    border-radius: 0.5rem;
    transition: border-color 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Buttons */
.btn {
    display: block;
    width: 100%;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    text-decoration: none;
}

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

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

.btn-primary:disabled {
    background: var(--gray-500);
    cursor: not-allowed;
}

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

/* Selection options */
.option-card {
    border: 2px solid var(--gray-200);
    border-radius: 0.75rem;
    padding: 1.25rem;
    margin-bottom: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.option-card:hover:not(.disabled) {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.option-card.selected {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.1);
}

.option-card.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--gray-100);
}

.option-card .option-title {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.option-card .option-desc {
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* Status badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
}

.badge-success {
    background: rgba(22, 163, 74, 0.1);
    color: var(--success);
}

.badge-warning {
    background: rgba(202, 138, 4, 0.1);
    color: var(--warning);
}

.badge-danger {
    background: rgba(220, 38, 38, 0.1);
    color: var(--danger);
}

/* Info box */
.info-box {
    background: rgba(37, 99, 235, 0.1);
    border-left: 4px solid var(--primary);
    padding: 1rem;
    border-radius: 0 0.5rem 0.5rem 0;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

/* Alert */
.alert {
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.alert-error {
    background: rgba(220, 38, 38, 0.1);
    color: var(--danger);
    border: 1px solid rgba(220, 38, 38, 0.2);
}

.alert-success {
    background: rgba(22, 163, 74, 0.1);
    color: var(--success);
    border: 1px solid rgba(22, 163, 74, 0.2);
}

.alert-warning {
    background: rgba(202, 138, 4, 0.1);
    color: var(--warning);
    border: 1px solid rgba(202, 138, 4, 0.2);
}

/* Stats grid (admin) */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.stat-card {
    background: white;
    border-radius: 0.75rem;
    padding: 1rem;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--gray-500);
    text-transform: uppercase;
}

/* Progress bar */
.progress-bar {
    height: 8px;
    background: var(--gray-200);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    transition: width 0.3s;
}

.progress-fill.full {
    background: var(--danger);
}

/* User info */
.user-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: white;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.user-info .nif {
    font-weight: 600;
}

.user-info .shift {
    color: var(--gray-500);
}

/* Logout link */
.logout-link {
    color: var(--danger);
    text-decoration: none;
    font-size: 0.875rem;
}

/* Loading spinner */
.loading {
    display: flex;
    justify-content: center;
    padding: 2rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Hidden */
.hidden {
    display: none !important;
}

/* Responsive adjustments */
@media (min-width: 640px) {
    .container {
        padding: 2rem;
    }

    .header {
        border-radius: 1rem;
        margin: 1rem;
    }
}