/* Lab Reporter — Clean & Minimal Theme */

:root {
    --lr-primary: #2563eb;
    --lr-primary-hover: #1d4ed8;
    --lr-bg: #f8fafc;
    --lr-card-bg: #ffffff;
    --lr-text: #1e293b;
    --lr-text-muted: #64748b;
    --lr-border: #e2e8f0;
    --lr-success: #16a34a;
    --lr-danger: #dc2626;
    --lr-warning: #d97706;
}

body {
    background-color: var(--lr-bg);
    color: var(--lr-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* ── Navbar ── */
.navbar {
    border-bottom: 1px solid var(--lr-border);
    padding: 0.75rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
}

/* ── All form inputs get Bootstrap styling automatically ── */
input[type="text"],
input[type="password"],
input[type="number"],
input[type="email"],
select,
textarea {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--lr-text);
    background-color: var(--lr-card-bg);
    border: 1px solid var(--lr-border);
    border-radius: 0.5rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--lr-primary);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* ── Cards ── */
.card {
    border: 1px solid var(--lr-border);
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    overflow: hidden;
}

.card-header {
    background-color: #f8fafc;
    border-bottom: 1px solid var(--lr-border);
    font-weight: 600;
}

/* ── Page headers ── */
.page-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--lr-border);
}

.page-header h2 {
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.page-header .text-muted {
    font-size: 0.9375rem;
}

/* ── Tables ── */
.table {
    border-radius: 0.5rem;
    overflow: hidden;
    border: 1px solid var(--lr-border);
}

.table thead th {
    background-color: #f8fafc;
    font-weight: 600;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--lr-text-muted);
    border-bottom: 2px solid var(--lr-border);
}

.table td {
    vertical-align: middle;
}

/* ── Badges ── */
.badge {
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* ── Buttons ── */
.btn {
    border-radius: 0.5rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
}

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

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

/* ── Access code display ── */
.access-code {
    font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, monospace;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--lr-primary);
}

/* ── Stat cards (lab detail) ── */
.stat-card {
    text-align: center;
    padding: 1.25rem;
}

.stat-card .stat-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--lr-text-muted);
    margin-bottom: 0.5rem;
}

.stat-card .stat-value {
    font-size: 1.125rem;
    font-weight: 600;
}

/* ── Field type badges ── */
.badge-input {
    background-color: #dbeafe;
    color: #1e40af;
}

.badge-calculated {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-choice {
    background-color: #ede9fe;
    color: #5b21b6;
}

.badge-constant {
    background-color: #e2e8f0;
    color: #475569;
}

/* ── Sortable field list ── */
.sortable-item {
    background: var(--lr-card-bg);
    border: 1px solid var(--lr-border);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    transition: box-shadow 0.15s;
}

.sortable-item:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.sortable-item .drag-handle {
    cursor: grab;
    color: var(--lr-text-muted);
    margin-right: 0.75rem;
}

.sortable-ghost {
    opacity: 0.4;
}

/* ── Formula builder cards ── */
.formula-card .card-header {
    background-color: #fefce8;
    border-bottom: 1px solid #fde68a;
}

.formula-preview {
    background: #f8fafc;
    border: 1px solid var(--lr-border);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-family: "SF Mono", "Fira Code", Menlo, monospace;
    font-size: 0.875rem;
}

/* ── Student submission form ── */
.field-wrapper {
    margin-bottom: 1.25rem;
}

.field-wrapper .form-label {
    font-weight: 600;
    font-size: 0.9375rem;
}

.field-wrapper .units-label {
    font-weight: 400;
    color: var(--lr-text-muted);
}

.field-error input {
    border-color: var(--lr-danger);
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.field-valid input {
    border-color: var(--lr-success);
}

.validation-message {
    font-size: 0.8125rem;
    margin-top: 0.375rem;
}

.validation-message.error {
    color: var(--lr-danger);
}

.validation-message.valid {
    color: var(--lr-success);
}

/* ── Grading result cards ── */
.result-card {
    border-radius: 0.75rem;
    margin-bottom: 1rem;
    overflow: hidden;
}

.result-card .result-header {
    padding: 0.75rem 1rem;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-card.correct .result-header {
    background-color: #f0fdf4;
    border-bottom: 1px solid #bbf7d0;
    color: #166534;
}

.result-card.incorrect .result-header {
    background-color: #fef2f2;
    border-bottom: 1px solid #fecaca;
    color: #991b1b;
}

.result-card .result-body {
    padding: 1rem;
}

/* ── Score display ── */
.score-display {
    font-size: 2rem;
    font-weight: 700;
}

.score-display .score-fraction {
    color: var(--lr-text-muted);
    font-size: 1.25rem;
    font-weight: 400;
}

/* ── Empty states ── */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--lr-text-muted);
}

.empty-state p {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
}

/* ── Login page ── */
.login-card {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2rem;
}

.login-card h2 {
    font-weight: 700;
    text-align: center;
    margin-bottom: 1.5rem;
}

/* ── Student entry page ── */
.entry-card {
    max-width: 480px;
    margin: 3rem auto;
    padding: 2.5rem;
    text-align: center;
}

.entry-card h2 {
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.entry-card .entry-input {
    font-size: 1.25rem;
    text-align: center;
    letter-spacing: 0.1em;
    padding: 0.75rem;
    text-transform: uppercase;
}

/* ── Responsive tweaks ── */
@media (max-width: 768px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .access-code {
        font-size: 1.5rem;
    }

    .score-display {
        font-size: 1.5rem;
    }
}