/* Tutor Attendance - tablet/mobile-first styling. Large touch targets throughout,
   since this is mainly used on a shared notebook/tablet at a front desk. */

:root {
    --color-bg: #f4f6f8;
    --color-card: #ffffff;
    --color-text: #1f2937;
    --color-muted: #6b7280;
    --color-border: #e2e5e9;
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-danger: #dc2626;
    --color-danger-dark: #b91c1c;
    --color-success-bg: #dcfce7;
    --color-success-text: #166534;
    --color-error-bg: #fee2e2;
    --color-error-text: #991b1b;
    --radius: 10px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    font-size: 18px;
    line-height: 1.4;
}

.topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.topbar h1 {
    font-size: 22px;
    margin: 0;
}

.back-link {
    color: var(--color-primary);
    text-decoration: none;
    font-size: 17px;
    white-space: nowrap;
}

.content {
    max-width: 640px;
    margin: 0 auto;
    padding: 20px;
}

.card {
    background: var(--color-card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    margin-bottom: 20px;
}

.card h2 {
    margin-top: 0;
    font-size: 19px;
}

label {
    display: block;
    font-weight: 600;
    margin: 16px 0 6px;
    font-size: 15px;
    color: var(--color-muted);
}

label:first-child { margin-top: 0; }

input[type="text"],
input[type="password"],
input[type="email"],
input[type="date"],
input[type="time"],
select {
    width: 100%;
    padding: 14px 12px;
    font-size: 18px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: #fff;
    color: var(--color-text);
}

input:focus, select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.btn {
    display: inline-block;
    padding: 14px 20px;
    font-size: 18px;
    font-weight: 600;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}
.btn-primary:active { background: var(--color-primary-dark); }
.btn-primary:disabled { background: #93b4f2; cursor: not-allowed; }

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

.btn-danger {
    background: var(--color-danger);
    color: #fff;
}
.btn-danger:active { background: var(--color-danger-dark); }

.btn-text {
    background: none;
    color: var(--color-muted);
    padding: 10px;
}

.btn-block {
    display: block;
    width: 100%;
    margin-top: 20px;
}

.btn-large {
    display: block;
    width: 100%;
    margin-bottom: 12px;
    padding: 18px 20px;
    font-size: 19px;
}

.btn-small {
    padding: 8px 14px;
    font-size: 15px;
}

.home-links a {
    display: block;
    margin-bottom: 14px;
}

.spacer { height: 24px; }

.flash {
    padding: 12px 14px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-weight: 600;
}
.flash-success { background: var(--color-success-bg); color: var(--color-success-text); }
.flash-error { background: var(--color-error-bg); color: var(--color-error-text); }

.hint {
    color: var(--color-muted);
    font-size: 14px;
}

.muted {
    color: var(--color-muted);
    font-size: 15px;
}

.live-clock {
    text-align: center;
    font-size: 44px;
    font-weight: 700;
    margin: 10px 0 24px;
    letter-spacing: 1px;
}

.clock-block {
    text-align: center;
    background: var(--color-bg);
    border-radius: var(--radius);
    padding: 18px;
    margin: 20px 0 4px;
}

.clock-date {
    color: var(--color-muted);
    font-size: 15px;
    margin-bottom: 6px;
}

.clock-time {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: 1px;
    font-variant-numeric: tabular-nums;
}

.clock-block .hint {
    margin-top: 10px;
    margin-bottom: 0;
}

.subtitle {
    text-align: center;
    color: var(--color-muted);
    margin-top: 0;
    font-size: 15px;
}

.toggle-group {
    display: flex;
    gap: 10px;
    margin-bottom: 4px;
}

.toggle-option {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 10px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    font-weight: 600;
    margin: 0;
    cursor: pointer;
}

.toggle-option input { width: auto; margin: 0; }

.inline-form .inline-row {
    display: flex;
    gap: 10px;
    align-items: stretch;
}

.inline-row input { flex: 1; }
.inline-row .btn { white-space: nowrap; }

.list-table, .report-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 8px;
}

.list-table td, .report-table td, .report-table th {
    padding: 12px 6px;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
    vertical-align: middle;
}

.report-table th {
    color: var(--color-muted);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.report-table tfoot td {
    border-top: 2px solid var(--color-border);
    border-bottom: none;
}

.col-hours, .col-action {
    text-align: right;
    white-space: nowrap;
}

.session-row {
    display: flex;
    flex-direction: column;
    color: inherit;
    text-decoration: none;
}

.session-row strong { font-size: 17px; }

.period-picker {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
}
.period-picker .btn { flex: 1; }

.range-heading {
    font-size: 17px;
    color: var(--color-muted);
    margin: 4px 0 12px;
}

@media (min-width: 640px) {
    .content { padding: 32px 20px; }
}