:root {
    --bg: #f4f6fb;
    --panel: #ffffff;
    --text: #1e2430;
    --muted: #6a7486;
    --border: #d7deea;
    --primary: #2558e0;
    --primary-soft: #e8efff;
    --danger: #c83737;
    --danger-soft: #fde9e9;
    --success: #1f8b4c;
    --success-soft: #e8f8ee;
    --warning: #b7791f;
    --warning-soft: #fff5e6;
    --shadow: 0 12px 30px rgba(27, 44, 94, 0.08);
    --radius: 16px;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

h1, h2, h3 {
    margin: 0 0 0.6rem;
}

p {
    margin: 0 0 1rem;
}

code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    background: #f1f4fa;
    padding: 0.15rem 0.35rem;
    border-radius: 6px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: #fff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 30;
}

.brand {
    font-size: 1.2rem;
    font-weight: 800;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.user-pill {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    padding: 0.5rem 0.8rem;
    background: var(--primary-soft);
    border-radius: 12px;
    font-size: 0.9rem;
}

.shell {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: calc(100vh - 82px);
}

.sidebar {
    background: #fff;
    border-right: 1px solid var(--border);
    padding: 1rem;
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.nav-link {
    padding: 0.85rem 1rem;
    border-radius: 12px;
    color: var(--text);
    font-weight: 600;
}

.nav-link:hover,
.nav-link.active {
    background: var(--primary-soft);
    color: var(--primary);
    text-decoration: none;
}

.content {
    padding: 1.5rem;
}

.page-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1rem 1.1rem;
    margin-bottom: 1rem;
}

.form-panel {
    min-width: 0;
}

.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-wrapper.wide {
    align-items: flex-start;
}

.auth-panel {
    width: min(460px, 100%);
}

.auth-panel.wide {
    width: min(840px, 100%);
}

.narrow {
    max-width: 520px;
}

.grid-two,
.grid-three,
.panel-split,
.teacher-selection-layout,
.teacher-assignment-layout,
.planner-layout {
    display: grid;
    gap: 1rem;
}

.grid-two,
.panel-split,
.teacher-selection-layout,
.planner-layout {
    grid-template-columns: minmax(320px, 1fr) minmax(320px, 1fr);
}

.grid-three {
    grid-template-columns: repeat(3, minmax(260px, 1fr));
}

.teacher-assignment-layout {
    grid-template-columns: 320px 1fr;
}

.planner-layout {
    grid-template-columns: 360px 1fr;
}

.grid-two.compact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.stack-form {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

label {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    font-weight: 600;
}

input[type="text"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="time"],
select,
textarea {
    width: 100%;
    padding: 0.7rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #fff;
    color: var(--text);
    font: inherit;
}

select[multiple] {
    min-height: 14rem;
}

textarea {
    resize: vertical;
}

.checkbox-row {
    flex-direction: row;
    align-items: center;
    gap: 0.65rem;
    font-weight: 500;
}

.checkbox-row input {
    width: auto;
}

.button,
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    border-radius: 12px;
    padding: 0.65rem 0.95rem;
    font: inherit;
    cursor: pointer;
    text-decoration: none;
}

.button:hover,
button:hover {
    text-decoration: none;
    filter: brightness(0.98);
}

.button-primary {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.button-danger {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
}

.button-light {
    background: #fff;
}

.button-small {
    padding: 0.45rem 0.7rem;
    border-radius: 10px;
    font-size: 0.9rem;
}

.button-row,
.button-list,
.filter-row,
.toolbar-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    align-items: center;
}

.button-list.vertical {
    flex-direction: column;
    align-items: stretch;
}

.inline-form {
    display: inline-flex;
    gap: 0.5rem;
    align-items: center;
    margin: 0;
}

.hidden-form {
    display: none;
}

.muted {
    color: var(--muted);
}

.small {
    font-size: 0.88rem;
}

.tiny {
    font-size: 0.75rem;
}

.flash {
    border-radius: 14px;
    padding: 0.85rem 1rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
}

.flash-success {
    background: var(--success-soft);
    border-color: #cdeed8;
    color: var(--success);
}

.flash-error {
    background: var(--danger-soft);
    border-color: #f7c8c8;
    color: var(--danger);
}

.flash-warning {
    background: var(--warning-soft);
    border-color: #f4deaa;
    color: var(--warning);
}

.info-box {
    border: 1px solid var(--border);
    border-radius: 14px;
    background: #f8faff;
    padding: 0.85rem;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.metric-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1rem;
    box-shadow: var(--shadow);
}

.metric-card span {
    display: block;
    color: var(--muted);
    margin-bottom: 0.4rem;
}

.metric-card strong {
    font-size: 1.5rem;
}

.metric-ok {
    border-color: #b9e7ca;
    background: var(--success-soft);
}

.metric-warn {
    border-color: #f2cf9c;
    background: var(--warning-soft);
}

.meta-list {
    display: grid;
    gap: 0.5rem;
}

.meta-list div {
    display: grid;
    grid-template-columns: 170px 1fr;
    gap: 0.5rem;
    align-items: baseline;
}

.meta-list dt {
    font-weight: 700;
}

.meta-list dd {
    margin: 0;
}

.table-wrap {
    overflow: auto;
}

.table-wrap.large table {
    min-width: 860px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    border-bottom: 1px solid var(--border);
    padding: 0.8rem 0.7rem;
    text-align: left;
    vertical-align: top;
}

th {
    background: #fafcff;
    position: sticky;
    top: 0;
    z-index: 1;
}

tr.is-current {
    background: #f8fbff;
}

.actions-cell {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.55rem;
    border-radius: 999px;
    font-size: 0.8rem;
    background: #eef2f8;
    color: var(--muted);
    margin-right: 0.3rem;
    margin-top: 0.2rem;
}

.status-pill.success {
    background: var(--success-soft);
    color: var(--success);
}

.status-pill.neutral {
    background: #eef2f8;
    color: var(--muted);
}

.chip-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.chip-link {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.65rem 0.9rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    font-weight: 600;
}

.chip-link span {
    color: var(--muted);
    font-size: 0.85rem;
}

.chip-link.active,
.chip-link:hover {
    background: var(--primary-soft);
    color: var(--primary);
    text-decoration: none;
    border-color: #b9cbff;
}

.sticky-toolbar {
    position: sticky;
    top: 84px;
    z-index: 15;
}

.slot-pool,
.assigned-slot-list {
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
    min-height: 120px;
}

.slot-chip,
.assigned-slot-chip,
.slot-card,
.teacher-timetable-slot {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 0.75rem 0.8rem;
    background: #fff;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.slot-chip strong,
.assigned-slot-chip strong,
.slot-card strong,
.teacher-timetable-slot strong {
    font-size: 1rem;
}

.slot-chip span,
.assigned-slot-chip span,
.slot-card span,
.teacher-timetable-slot span {
    color: var(--muted);
    font-size: 0.9rem;
}

.slot-chip[draggable="true"],
.assigned-slot-chip[draggable="true"],
.slot-card[draggable="true"] {
    cursor: grab;
}

.dragging {
    opacity: 0.55;
}

.slot-chip.full {
    background: #f0f2f6;
    color: #8893a5;
    border-style: dashed;
}

.slot-chip.inactive {
    background: #f7f8fb;
    border-style: dashed;
}

.assigned-slot-chip.conflict,
.teacher-timetable-slot.conflict {
    border-color: #e4ab56;
    background: var(--warning-soft);
}

.warning-text {
    color: var(--warning) !important;
    font-weight: 700;
}

.planner-grid-wrap {
    overflow: auto;
}

.planner-grid {
    min-width: 920px;
    table-layout: fixed;
}

.planner-grid th,
.planner-grid td {
    width: 12.5%;
}

.phase-head {
    width: 10rem;
    min-width: 10rem;
}

.drop-cell,
.drop-zone,
.teacher-card {
    transition: background 0.15s ease, border-color 0.15s ease;
}

.drop-cell {
    min-height: 88px;
    background: #fbfcff;
}

.drop-label {
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.na-cell {
    background: #f0f3f8;
}

.drop-zone-hover {
    background: #eef4ff !important;
    border-color: var(--primary) !important;
}

.scheduled-cell {
    background: #f8fbff;
}

.teacher-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
}

.teacher-card {
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 0.9rem;
    background: #fbfcff;
}

.teacher-card header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.6rem;
}

.teacher-points {
    padding: 0.35rem 0.55rem;
    border-radius: 999px;
    font-size: 0.84rem;
    font-weight: 700;
    background: var(--warning-soft);
    color: var(--warning);
}

.teacher-points.ok {
    background: var(--success-soft);
    color: var(--success);
}

.teacher-points.warn {
    background: var(--warning-soft);
    color: var(--warning);
}

.print-wrapper {
    padding: 1.25rem;
}

.print-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.credentials-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(280px, 1fr));
    gap: 1rem;
}

.credential-card {
    min-height: 160px;
    padding: 1rem;
    border: 2px dashed #9098a8;
    border-radius: 14px;
    background: #fff;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    page-break-inside: avoid;
}

.credential-title {
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 0.35rem;
}

.print-class-block {
    margin-bottom: 2rem;
    page-break-inside: avoid;
}

.print-grid .scheduled-cell {
    background: #fff;
}

.teacher-grid td {
    min-height: 90px;
}

.compact-list {
    padding-left: 1.1rem;
    margin: 0 0 1rem;
}

.compact-list li {
    margin-bottom: 0.35rem;
}

.week-switcher {
    gap: 0.5rem;
}

.no-print {
    display: block;
}

@media (max-width: 1100px) {
    .shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: 0;
        border-bottom: 1px solid var(--border);
    }

    .grid-two,
    .panel-split,
    .teacher-selection-layout,
    .teacher-assignment-layout,
    .planner-layout,
    .grid-three {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .content {
        padding: 1rem;
    }

    .topbar {
        padding: 1rem;
    }

    .planner-grid {
        min-width: 760px;
    }

    .credentials-grid {
        grid-template-columns: 1fr;
    }
}

@media print {
    body {
        background: #fff;
    }

    .no-print {
        display: none !important;
    }

    .panel,
    .metric-card {
        box-shadow: none;
        border-color: #bfc7d7;
    }

    .print-wrapper {
        padding: 0;
    }

    .credential-card,
    .print-class-block {
        break-inside: avoid;
    }

    .planner-grid,
    .teacher-grid {
        min-width: 0;
        width: 100%;
    }
}