:root {
    --bg: #0a0a0a;
    --panel: #151515;
    --card: #181818;
    --line: #2a2a2a;
    --text: #f2f2f2;
    --muted: #a4a4a4;
    --emerald: #28c6b7;
    --danger: #ff5f5f;
    --ok: #79d98f;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    min-height: 100%;
    font-family: Tahoma, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

body {
    background:
        radial-gradient(circle at 10% 0%, rgba(40, 198, 183, 0.08), transparent 28%),
        var(--bg);
}

.app-shell {
    max-width: 1120px;
    margin: 0 auto;
    padding: 14px;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    background: #080808;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 12px 14px;
    margin-bottom: 14px;
}

.topbar-title {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
}

.topbar-link {
    color: var(--text);
    text-decoration: none;
    border: 1px solid var(--line);
    padding: 8px 12px;
    border-radius: 10px;
}

.topbar-link:hover {
    background: #1b1b1b;
}

.point-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 auto;
    padding: 6px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: #111;
}

.point-icon {
    width: 17px;
    height: 17px;
    fill: var(--emerald);
}

.point-value {
    font-weight: 700;
}

.content-wrap {
    display: grid;
    gap: 12px;
}

.card {
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--panel);
    padding: 16px;
}

.card h1, .card h2, .card p {
    margin-top: 0;
}

.hint {
    color: var(--muted);
    font-size: 13px;
    margin-bottom: 12px;
}

.point-positive {
    color: var(--ok);
    font-weight: 700;
}

.point-negative {
    color: var(--danger);
    font-weight: 700;
}

.admin-grid,
.session-cards {
    display: grid;
    gap: 10px;
}

.admin-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.panel-link,
.session-card {
    text-decoration: none;
    color: var(--text);
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--card);
    padding: 12px;
}

.panel-link:hover,
.session-card:hover {
    background: #1d1d1d;
}

.session-card {
    display: grid;
    gap: 6px;
    position: relative;
    cursor: pointer;
    padding: 14px;
}

.session-card span {
    display: block;
    color: var(--muted);
    font-size: 13px;
}

.session-card strong {
    display: block;
    line-height: 1.5;
}

.session-card.selected {
    border-color: var(--emerald);
    box-shadow: 0 0 0 1px rgba(40, 198, 183, 0.15) inset;
}

.session-card input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    position: absolute;
    inset-inline-start: 10px;
    inset-block-start: 10px;
    width: 15px;
    height: 15px;
    border-radius: 3px;
    background: #0a0a0a;
    border: 1px solid var(--line);
    padding: 0;
    cursor: pointer;
}

.session-card input[type="checkbox"]:checked {
    background: var(--emerald);
    border-color: var(--emerald);
}

.session-cards {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.session-grid {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.session-card-item {
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--card);
    padding: 12px;
    display: grid;
    gap: 8px;
}

.session-card-item h3 {
    margin: 0;
    line-height: 1.35;
}

.session-card-item .meta {
    margin: 0;
    color: var(--muted);
}

.session-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    color: var(--muted);
}

.session-stats strong {
    color: var(--text);
}

.session-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.session-actions a {
    text-decoration: none;
    border: 1px solid var(--line);
    padding: 7px 10px;
    border-radius: 8px;
    color: var(--text);
}

.session-actions a:hover {
    background: #1d1d1d;
}

.detail-head {
    display: grid;
    gap: 4px;
    margin-bottom: 10px;
}

.stack-form {
    display: grid;
    gap: 12px;
}

.stack-form label {
    display: grid;
    gap: 6px;
}

.two-column,
.attendance-head,
.employee-card {
    display: flex;
    gap: 10px;
    align-items: center;
}

.two-column {
    align-items: end;
}

.attendance-head {
    color: var(--muted);
    font-size: 13px;
}

.attendance-list {
    display: grid;
    gap: 8px;
}

.employee-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 10px;
    transition: border-color 160ms ease;
}

.employee-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.employee-card.is-absent {
    border-color: #3a3a3a;
    opacity: 0.78;
}

.employee-card .status-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    user-select: none;
}

.status-toggle input {
    appearance: none;
    -webkit-appearance: none;
    width: 38px;
    height: 20px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: #171717;
    position: relative;
    cursor: pointer;
}

.status-toggle input::before {
    content: "";
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--muted);
    transition: transform 0.2s ease;
}

.status-toggle input:checked {
    border-color: var(--emerald);
    background: rgba(40, 198, 183, 0.2);
}

.status-toggle input:checked::before {
    transform: translateX(18px);
    background: var(--emerald);
}

input,
textarea,
select,
button,
.btn {
    border: 1px solid var(--line);
    background: #090909;
    color: var(--text);
    border-radius: 8px;
    padding: 10px;
    font-family: inherit;
    outline: none;
}

input:focus,
textarea:focus,
select:focus,
button:focus,
.btn:focus {
    border-color: #474747;
}

input:disabled,
textarea:disabled,
select:disabled {
    opacity: 0.6;
}

textarea {
    width: 100%;
    min-height: 52px;
    resize: vertical;
}

.btn {
    display: inline-flex;
    text-decoration: none;
    align-items: center;
    justify-content: center;
    width: max-content;
    cursor: pointer;
}

button,
.btn {
    cursor: pointer;
}

button:hover,
.btn:hover {
    background: #171717;
}

.btn.ghost {
    background: transparent;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 6px;
}

.table th,
.table td {
    border: 1px solid var(--line);
    text-align: right;
    padding: 8px 10px;
}

.table thead th {
    background: #1a1a1a;
}

.table tbody tr:nth-child(even) {
    background: #101010;
}

.flash {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px;
}

.flash.success {
    border-color: var(--ok);
    background: rgba(121, 217, 143, 0.16);
    color: #d9ffd5;
}

.flash.error {
    border-color: var(--danger);
    background: rgba(255, 95, 95, 0.16);
    color: #ffd4d4;
}

@media (max-width: 980px) {
    .topbar {
        flex-wrap: wrap;
    }

    .point-pill {
        margin: 0;
        margin-left: auto;
    }
}

@media (max-width: 760px) {
    .app-shell {
        padding: 10px;
    }

    .two-column,
    .attendance-head,
    .employee-card,
    .session-stats,
    .session-actions {
        grid-template-columns: 1fr;
    }

    .session-card input[type="checkbox"] {
        position: static;
        margin-inline-start: auto;
        margin-bottom: 4px;
        width: 16px;
        height: 16px;
    }
}