:root {
  --bg: #f4efe7;
  --paper: rgba(255, 252, 245, 0.88);
  --panel: rgba(255, 255, 255, 0.82);
  --line: rgba(64, 52, 39, 0.12);
  --text: #1d140f;
  --muted: #6f6258;
  --accent: #cb5e38;
  --accent-strong: #9d3f23;
  --accent-soft: rgba(203, 94, 56, 0.14);
  --gold: #d7a24d;
  --teal: #1f7a79;
  --shadow: 0 18px 50px rgba(56, 38, 21, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --font-display: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "IBM Plex Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(215, 162, 77, 0.2), transparent 28%),
    radial-gradient(circle at 85% 15%, rgba(31, 122, 121, 0.16), transparent 22%),
    linear-gradient(180deg, #f9f3ea 0%, #f3ebde 48%, #efe4d4 100%);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
}

.shell {
  width: min(1200px, calc(100vw - 32px));
  margin: 24px auto 40px;
}

.brand-link,
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--text);
}

.brand-link {
  text-decoration: none;
}

.brand-mark {
  width: 52px;
  height: 52px;
  border-radius: 18px;
  padding: 6px;
  object-fit: contain;
  background: #120f0b;
  box-shadow: 0 14px 28px rgba(18, 15, 11, 0.18);
  flex-shrink: 0;
}

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand-tagline {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(255, 251, 245, 0.95), rgba(245, 235, 220, 0.82));
  box-shadow: var(--shadow);
}

.hero::after {
  content: '';
  position: absolute;
  inset: auto -80px -100px auto;
  width: 260px;
  height: 260px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(203, 94, 56, 0.25), transparent 64%);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(64, 52, 39, 0.08);
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1,
.hero h2 {
  margin: 18px 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.hero h1 {
  font-size: clamp(36px, 6vw, 64px);
  line-height: 0.96;
}

.hero h2 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.02;
}

.hero p,
.muted {
  color: var(--muted);
}

.hero-identity {
  display: inline-flex;
  align-items: center;
  margin: 10px 0 0;
  padding: 10px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(31, 122, 121, 0.14), rgba(215, 162, 77, 0.22));
  border: 1px solid rgba(31, 122, 121, 0.18);
  color: var(--text);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  box-shadow: 0 12px 24px rgba(31, 122, 121, 0.08);
}

.grid {
  display: grid;
  gap: 18px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.panel-pad {
  padding: 22px;
}

.stat-card {
  padding: 20px;
  min-height: 132px;
}

.stat-label {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.stat-value {
  margin-top: 12px;
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: -0.04em;
}

.stat-note {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff7f1;
  box-shadow: 0 10px 20px rgba(157, 63, 35, 0.24);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.88);
  color: var(--text);
  border: 1px solid var(--line);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
}

.btn-score {
  min-height: 38px;
  padding: 0 14px;
  font-size: 14px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  border: 1px solid rgba(203, 94, 56, 0.18);
  cursor: pointer;
}

.btn-score[data-tone="teal"] {
  background: rgba(31, 122, 121, 0.12);
  color: var(--teal);
  border-color: rgba(31, 122, 121, 0.18);
}

.btn-score[data-tone="gold"] {
  background: rgba(215, 162, 77, 0.16);
  color: #8a5e17;
  border-color: rgba(215, 162, 77, 0.22);
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  cursor: pointer;
  color: var(--muted);
  transition: all 160ms ease;
}

.chip.active {
  color: #fff7f1;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  border-color: transparent;
}

.chart-card {
  padding: 18px 18px 8px;
}

.chart-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.chart-title,
.panel-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

.chart {
  width: 100%;
  height: 340px;
}

.chart-tall {
  height: 420px;
}

.teacher-select-grid {
  display: grid;
  grid-template-columns: 1.1fr 1.1fr 0.8fr;
  gap: 16px;
  align-items: end;
}

.teacher-select {
  min-height: 50px;
  border-radius: 14px;
}

.teacher-entry-field {
  align-self: end;
}

.teacher-entry-btn {
  width: 100%;
}

.student-list {
  display: grid;
  gap: 14px;
}

.student-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.7);
}

.student-main {
  display: grid;
  gap: 10px;
}

.student-name {
  font-size: 22px;
  font-weight: 700;
}

.student-meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 14px;
}

.score-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.auth-wrap {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
  margin-top: 18px;
}

.auth-form {
  display: grid;
  gap: 16px;
}

.field {
  display: grid;
  gap: 8px;
}

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

.input {
  width: 100%;
  min-height: 50px;
  padding: 0 16px;
  border-radius: 14px;
  border: 1px solid rgba(64, 52, 39, 0.12);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
}

.hint-list {
  display: grid;
  gap: 12px;
}

.hint {
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.hint strong {
  display: block;
  margin-bottom: 6px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 18px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.68);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.nav-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.nav-link {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
}

.nav-link.active {
  background: rgba(31, 122, 121, 0.14);
  color: var(--teal);
  border-color: rgba(31, 122, 121, 0.18);
}

.kpi-strip {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.kpi {
  min-width: 150px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.kpi strong {
  display: block;
  font-size: 24px;
  margin-top: 6px;
}

.timeline {
  display: grid;
  gap: 12px;
}

.timeline-records {
  display: grid;
  gap: 14px;
}

.timeline-record {
  position: relative;
  padding: 18px 18px 18px 44px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
}

.timeline-record::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 22px;
  bottom: -22px;
  width: 2px;
  background: rgba(31, 122, 121, 0.16);
}

.timeline-record:last-child::before {
  bottom: 22px;
}

.timeline-record::after {
  content: '';
  position: absolute;
  left: 14px;
  top: 22px;
  width: 14px;
  height: 14px;
  border-radius: 999px;
  background: var(--teal);
  box-shadow: 0 0 0 4px rgba(31, 122, 121, 0.12);
}

.timeline-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.7);
}

.timeline-item span:last-child {
  font-weight: 700;
}

.selector-grid {
  display: grid;
  gap: 14px;
}

.selector-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.selector-card:hover {
  transform: translateY(-1px);
}

.selector-card.active {
  border-color: rgba(203, 94, 56, 0.26);
  background: linear-gradient(135deg, rgba(203, 94, 56, 0.12), rgba(255, 255, 255, 0.92));
}

.selector-card h3,
.lesson-row strong {
  margin: 0 0 8px;
  font-size: 20px;
}

.selector-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
}

.lesson-list,
.action-log,
.data-list {
  display: grid;
  gap: 12px;
}

.lesson-row,
.action-item,
.data-row {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
}

.lesson-row.active {
  border-color: rgba(31, 122, 121, 0.25);
  background: rgba(31, 122, 121, 0.1);
}

.lesson-row-head,
.action-head,
.data-row-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  background: rgba(31, 122, 121, 0.12);
  color: var(--teal);
}

.status-badge.finished {
  background: rgba(215, 162, 77, 0.16);
  color: #8a5e17;
}

.status-badge.draft {
  background: rgba(111, 98, 88, 0.12);
  color: var(--muted);
}

.inline-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.select {
  min-height: 42px;
  padding: 0 14px;
  border-radius: 12px;
  border: 1px solid rgba(64, 52, 39, 0.12);
  background: rgba(255, 255, 255, 0.9);
}

.section-stack {
  display: grid;
  gap: 18px;
}

.action-item small,
.data-row small,
.lesson-row small {
  color: var(--muted);
}

.lesson-combined-grid {
  display: grid;
  gap: 16px;
}

.inline-feedback {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(31, 122, 121, 0.1);
  color: var(--teal);
  border: 1px solid rgba(31, 122, 121, 0.14);
  font-size: 14px;
}

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

.pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(31, 122, 121, 0.1);
  color: var(--teal);
  font-size: 13px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.form-grid .field.full {
  grid-column: 1 / -1;
}

.admin-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
}

.table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

.table th,
.table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(64, 52, 39, 0.08);
  text-align: left;
  vertical-align: top;
}

.table th {
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.table tr:last-child td {
  border-bottom: 0;
}

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

.mini-btn {
  min-height: 32px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  cursor: pointer;
}

.mini-btn.danger {
  color: #a63f27;
  border-color: rgba(166, 63, 39, 0.18);
  background: rgba(166, 63, 39, 0.08);
}

.checklist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(64, 52, 39, 0.1);
  background: rgba(255, 255, 255, 0.76);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(215, 162, 77, 0.14);
  color: #8a5e17;
  font-size: 12px;
}

.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.split-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 18px;
}

.detail-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
}

.detail-card h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.detail-list {
  display: grid;
  gap: 10px;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(64, 52, 39, 0.08);
}

.detail-row:last-child {
  border-bottom: 0;
}

.toggle-chip {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  color: var(--muted);
}

.toggle-chip.active {
  background: rgba(31, 122, 121, 0.12);
  color: var(--teal);
  border-color: rgba(31, 122, 121, 0.2);
}

.module-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.module-tab {
  padding: 12px 16px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
  color: var(--muted);
  cursor: pointer;
}

.module-tab.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff7f1;
  border-color: transparent;
}

.module-panel {
  display: none;
}

.module-panel.active {
  display: block;
}

.workspace-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 18px;
}

.workspace-vertical {
  display: grid;
  gap: 18px;
}

.workspace-stack {
  display: grid;
  gap: 18px;
}

.module-shell {
  display: grid;
  gap: 18px;
}

.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.section-copy {
  display: grid;
  gap: 6px;
}

.section-copy p {
  margin: 0;
}

.table-card {
  display: grid;
  gap: 16px;
}

.student-pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  max-height: 98px;
  overflow: hidden;
  align-content: flex-start;
}

.student-pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: rgba(31, 122, 121, 0.12);
  color: var(--teal);
  border: 1px solid rgba(31, 122, 121, 0.14);
  font-size: 13px;
  line-height: 1;
}

.student-pill.more {
  background: rgba(215, 162, 77, 0.18);
  color: #8a5e17;
  border-color: rgba(215, 162, 77, 0.22);
}

.pagination-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

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

.pagination-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn[disabled] {
  opacity: 0.48;
  cursor: not-allowed;
  transform: none;
}

.btn[disabled]:hover {
  transform: none;
}

.table td small,
.table td div small {
  color: var(--muted);
}

.table td {
  word-break: break-word;
}

.empty-state {
  padding: 36px 24px;
  text-align: center;
  color: var(--muted);
}

.toast {
  position: fixed;
  right: 22px;
  bottom: 22px;
  min-width: 220px;
  max-width: min(420px, calc(100vw - 32px));
  padding: 14px 16px;
  border-radius: 16px;
  color: #fff7f1;
  background: rgba(28, 22, 16, 0.92);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: all 180ms ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.empty {
  padding: 24px;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 960px) {
  .grid-2,
  .grid-3,
  .auth-wrap,
  .admin-columns,
  .form-grid,
  .split-grid,
  .workspace-grid,
  .teacher-select-grid {
    grid-template-columns: 1fr;
  }

  .student-card {
    grid-template-columns: 1fr;
  }

  .score-group {
    justify-content: flex-start;
  }

  .hero {
    padding: 24px;
  }

  .nav {
    align-items: flex-start;
  }
}