@charset "UTF-8";

:root {
  --bg: #eaf2ff;
  --bg-2: #f7fbff;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-strong: #ffffff;
  --text: #0e1a33;
  --muted: #5c6f91;
  --line: rgba(20, 54, 110, 0.14);
  --blue: #2563eb;
  --blue-2: #1d4ed8;
  --blue-soft: #dbeafe;
  --green: #0f9d58;
  --amber: #d97706;
  --shadow: 0 18px 50px rgba(13, 42, 89, 0.12);
  --radius: 14px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
}

html {
  font-family: "Be Vietnam Pro", "Segoe UI", system-ui, sans-serif;
}

body {
  margin: 0;
  font-family: "Be Vietnam Pro", "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.15), transparent 32%),
    linear-gradient(180deg, #f5f9ff 0%, var(--bg) 100%);
  min-height: 100vh;
}

button,
input,
select,
textarea {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
  align-items: start;
}

.sidebar {
  padding: 24px;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(18px);
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.brand-mark {
  display: none;
}

.brand-name {
  font-weight: 800;
  font-size: 1.05rem;
}

.brand-subtitle,
.eyebrow,
.nav-desc,
.muted {
  color: var(--muted);
}

.chip,
.secondary-btn,
.ghost-btn,
.nav-item,
.metric-card,
.card,
.tab,
.action-btn,
.primary-btn,
.segment {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: none;
}

.chip,
.secondary-btn,
.ghost-btn,
.action-btn,
.primary-btn,
.tab {
  border-radius: 999px;
  padding: 10px 14px;
  cursor: pointer;
}

.chip.active,
.tab.active {
  background: var(--blue);
  color: white;
  border-color: var(--blue);
}

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

.nav-item {
  padding: 14px;
  border-radius: 12px;
  text-align: left;
  cursor: pointer;
}

.nav-item.active {
  background: var(--panel-strong);
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: var(--shadow);
}

.nav-title {
  font-weight: 700;
}

.sidebar-footer {
  margin-top: auto;
  display: grid;
  gap: 10px;
}

.secondary-btn {
  background: var(--blue);
  color: white;
}

.ghost-btn {
  background: transparent;
}

.main {
  padding: 24px;
  min-width: 0;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.topbar-actions:empty {
  display: none;
}

.logout-btn {
  width: 100%;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 12px;
  padding: 10px 12px;
  cursor: pointer;
  color: var(--muted);
  font-weight: 700;
}

.logout-btn:hover {
  background: #ffffff;
  color: var(--text);
}

.role-select {
  min-width: 180px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  color: var(--text);
  padding: 0 12px;
  font: inherit;
}

#resetDemo {
  min-width: 132px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  color: var(--text);
  padding: 0 16px;
  font: inherit;
}

#resetDemo:hover {
  border-color: rgba(37, 99, 235, 0.28);
  background: #ffffff;
}

.topbar h1 {
  margin: 4px 0 8px;
  font-size: 2rem;
}

.topbar p {
  margin: 0;
  max-width: 760px;
  line-height: 1.5;
}

.topbar-metrics {
  display: grid;
  grid-auto-flow: column;
  gap: 14px;
  margin: 10px 0 18px;
}

.topbar-metrics:empty {
  display: none;
  margin: 0;
}

.metric-card {
  border-radius: 14px;
  padding: 16px 18px;
  min-width: 140px;
  background: rgba(255, 255, 255, 0.9);
}

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

.metric-label {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 4px;
}

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

.hero,
.card,
.band {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.84);
  box-shadow: var(--shadow);
}

.hero {
  padding: 24px;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.92), rgba(96, 165, 250, 0.9)),
    #1d4ed8;
  color: white;
  overflow: hidden;
  margin-top: 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
  align-items: center;
}

.hero h2 {
  margin: 0 0 8px;
  font-size: 1.9rem;
}

.hero p {
  margin: 0 0 16px;
  max-width: 56ch;
  line-height: 1.6;
}

.hero-actions,
.row-actions,
.tabs,
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.primary-btn {
  background: white;
  color: var(--blue-2);
  border-color: white;
  font-weight: 700;
}

.card,
.band {
  padding: 20px;
}

.section-title {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}

.section-title h3,
.section-title h4 {
  margin: 0;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 18px;
}

.phase-track {
  display: grid;
  gap: 12px;
}

.phase-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px;
  border-radius: 12px;
  background: var(--bg-2);
}

.phase-item.current {
  background: var(--blue-soft);
  border: 1px solid rgba(37, 99, 235, 0.18);
}

.status {
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}

.status.done { background: #dcfce7; color: #166534; }
.status.current { background: #dbeafe; color: #1d4ed8; }
.status.locked { background: #eef2ff; color: #475569; }

.unit-grid,
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.dropdown-panel {
  margin-bottom: 18px;
  padding: 14px;
  border-radius: 14px;
  background: #f8fbff;
  border: 1px solid var(--line);
}

.program-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.program-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: white;
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.program-tab.active {
  background: var(--blue);
  border-color: var(--blue);
  color: white;
}

.program-tab-count {
  font-weight: 500;
  font-size: 12px;
  color: var(--muted);
}

.program-tab.active .program-tab-count {
  color: rgba(255, 255, 255, 0.82);
}

/* Lộ trình xoắn ốc theo buổi */
.spiral-note {
  font-size: 13px;
  line-height: 1.55;
  margin: 0 0 12px;
}

.spiral-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 14px;
  font-size: 12px;
  color: var(--muted);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.spiral-swatch {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  display: inline-block;
  background: var(--line);
}

.spiral-swatch.routine,
.spiral-cell.routine,
.spiral-chip.routine {
  --strand: #64748b;
}

.spiral-swatch.topic,
.spiral-cell.topic,
.spiral-chip.topic {
  --strand: var(--blue);
}

.spiral-swatch.story,
.spiral-cell.story,
.spiral-chip.story {
  --strand: var(--amber);
}

.spiral-swatch.song,
.spiral-cell.song,
.spiral-chip.song {
  --strand: var(--green);
}

.spiral-swatch.phonics,
.spiral-cell.phonics,
.spiral-chip.phonics {
  --strand: #7c3aed;
}

.spiral-swatch.milestone,
.spiral-cell.milestone,
.spiral-chip.milestone {
  --strand: #dc2626;
}

.spiral-swatch {
  background: var(--strand, var(--line));
}

.spiral-swatch.repeat {
  opacity: 0.32;
}

.spiral-wrap {
  overflow-x: auto;
  padding-bottom: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.spiral-grid {
  display: grid;
  grid-template-columns: 190px repeat(var(--spiral-cols), 22px);
  gap: 2px;
  padding: 8px;
  min-width: max-content;
}

.spiral-corner {
  position: sticky;
  left: 0;
  z-index: 2;
  background: var(--panel);
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  display: flex;
  align-items: flex-end;
  padding: 0 8px 6px 0;
}

.spiral-head {
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 10px;
  font-weight: 600;
  padding: 2px 0;
  cursor: pointer;
  border-radius: 4px;
}

.spiral-head.milestone {
  color: #dc2626;
  font-weight: 800;
}

.spiral-head.active {
  background: var(--blue);
  color: white;
}

.spiral-label {
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--panel);
  padding: 4px 10px 4px 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  border-right: 2px solid var(--strand, var(--line));
  overflow: hidden;
}

.spiral-label strong {
  font-size: 12px;
  line-height: 1.25;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.spiral-label .muted {
  font-size: 10px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.spiral-label.routine { --strand: #64748b; }
.spiral-label.topic { --strand: var(--blue); }
.spiral-label.story { --strand: var(--amber); }
.spiral-label.song { --strand: var(--green); }
.spiral-label.phonics { --strand: #7c3aed; }
.spiral-label.milestone { --strand: #dc2626; }

.spiral-cell {
  height: 20px;
  border: 0;
  border-radius: 4px;
  cursor: pointer;
  padding: 0;
  background: var(--strand, var(--line));
}

.spiral-cell.intro {
  box-shadow: inset 0 0 0 2px rgba(15, 23, 42, 0.28);
}

.spiral-cell.repeat {
  opacity: 0.32;
}

.spiral-cell.empty {
  background: #f1f5f9;
}

.spiral-cell.col,
.spiral-cell.empty.col {
  outline: 2px solid var(--blue);
  outline-offset: -2px;
}

.spiral-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.spiral-chip {
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--strand, var(--muted));
  background: color-mix(in srgb, var(--strand, var(--line)) 12%, white);
  border: 1px solid color-mix(in srgb, var(--strand, var(--line)) 32%, white);
}

.spiral-chip.intro {
  color: white;
  background: var(--strand, var(--blue));
  border-color: var(--strand, var(--blue));
}

.session-tasks {
  display: grid;
  gap: 8px;
}

.task-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  border-radius: var(--radius-sm);
  background: white;
}

.task-item.intro { border-left-color: var(--blue); }
.task-item.repeat { border-left-color: var(--amber); }
.task-item.phonics { border-left-color: #7c3aed; }
.task-item.milestone { border-left-color: #dc2626; }

.task-index {
  width: 24px;
  height: 24px;
  flex: 0 0 24px;
  border-radius: 50%;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.task-body {
  flex: 1;
  min-width: 0;
}

.task-body strong {
  font-size: 14px;
}

.task-body .muted {
  font-size: 13px;
  line-height: 1.5;
  margin-top: 2px;
}

.task-time {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  white-space: nowrap;
}

.spiral-steps {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}

.spiral-steps .action-btn[disabled] {
  opacity: 0.45;
  cursor: default;
}

/* Roadmap: danh sách Day của một chương trình */
.day-list {
  display: grid;
  gap: 10px;
}

.day-chapter {
  margin: 14px 0 2px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  border-top: 1px dashed var(--line);
  padding-top: 12px;
}

.day-list > .day-chapter:first-child {
  margin-top: 0;
  border-top: 0;
  padding-top: 0;
}

.day-row {
  display: block;
  width: 100%;
  text-align: left;
  font: inherit;
  color: inherit;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: white;
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.day-row:hover {
  border-color: rgba(37, 99, 235, 0.35);
  transform: translateY(-1px);
}

.day-row.current {
  border-color: rgba(37, 99, 235, 0.45);
  box-shadow: 0 10px 26px rgba(37, 99, 235, 0.08);
}

.day-row.milestone {
  border-left: 4px solid #dc2626;
}

.day-row-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.day-num {
  flex: 0 0 auto;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue);
}

.day-title {
  flex: 1;
  min-width: 0;
  font-size: 14px;
}

.day-row-head .status {
  flex: 0 0 auto;
}

.day-unit {
  font-size: 13px;
  margin-bottom: 10px;
}

.day-row .spiral-chips {
  margin: 10px 0 0;
}

.day-row .session-tasks {
  margin-top: 14px;
}

.day-row .row-actions .ghost-btn[disabled] {
  opacity: 0.45;
  cursor: default;
}

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

.lesson-row {
  width: 100%;
  text-align: left;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: white;
  cursor: pointer;
}

.lesson-row.active {
  border-color: rgba(37, 99, 235, 0.35);
  box-shadow: 0 10px 26px rgba(37, 99, 235, 0.08);
}

.lesson-row-main {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 10px;
}

/* Roadmap tầng 1: lưới chương trình */
.program-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.program-card {
  display: block;
  width: 100%;
  text-align: left;
  font: inherit;
  color: inherit;
  padding: 20px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: white;
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.program-card:hover {
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.08);
  transform: translateY(-2px);
}

.program-card.mine {
  border-color: rgba(37, 99, 235, 0.4);
  background: linear-gradient(160deg, var(--blue-soft), #ffffff 55%);
}

.program-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.program-card-head strong {
  font-size: 17px;
}

.program-card-meta {
  display: flex;
  gap: 14px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 12px;
}

.program-card .spiral-chips {
  margin: 12px 0 14px;
}

.program-card-cta {
  font-size: 13px;
  font-weight: 700;
  color: var(--blue);
}

/* Breadcrumb roadmap */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: 14px;
  font-size: 13px;
}

.crumb {
  border: 0;
  background: transparent;
  font: inherit;
  padding: 4px 8px;
  border-radius: 8px;
  color: var(--blue);
  font-weight: 600;
  cursor: pointer;
}

.crumb:hover {
  background: var(--blue-soft);
}

.crumb.current {
  color: var(--muted);
  font-weight: 600;
  padding: 4px 8px;
}

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

/* Trang Thông tin của tôi */
.profile-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.profile-avatar {
  flex: 0 0 auto;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 22px;
  font-weight: 700;
  color: var(--blue);
  background: var(--blue-soft);
}

.profile-ident {
  flex: 1;
  min-width: 0;
}

.profile-ident h3 {
  margin: 0 0 4px;
}

.profile-ident p {
  margin: 0;
  font-size: 13px;
}

.profile-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.profile-info-item {
  display: grid;
  gap: 4px;
  font-size: 14px;
}

.profile-info-item span {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.lesson-stepper {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.step-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #fff;
  cursor: pointer;
  text-align: left;
}

.step-chip span {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: #eff6ff;
  color: var(--blue-2);
  font-weight: 800;
  flex: 0 0 auto;
}

.step-chip.active {
  border-color: rgba(37, 99, 235, 0.38);
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.1);
  background: #f8fbff;
}

.step-chip strong {
  font-size: 0.95rem;
}

.unit-card,
.mini-card {
  padding: 18px;
  border-radius: 14px;
  background: white;
  border: 1px solid var(--line);
}

.package-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.package-strip span {
  display: inline-flex;
  align-items: center;
  padding: 5px 9px;
  border-radius: 999px;
  background: #eff6ff;
  color: #1746aa;
  border: 1px solid rgba(37, 99, 235, 0.12);
  font-size: 0.78rem;
  font-weight: 700;
}

.package-card {
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 16px;
}

.package-card-title {
  font-weight: 800;
  margin-bottom: 12px;
}

.package-card-grid {
  display: grid;
  gap: 10px;
}

.package-card-grid div {
  display: grid;
  gap: 4px;
}

.package-card-grid span {
  opacity: 0.85;
  font-size: 0.8rem;
}

.package-card-grid strong {
  font-size: 0.95rem;
  line-height: 1.45;
}

.unit-card.current {
  border-color: rgba(37, 99, 235, 0.35);
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.12);
}

.progress {
  height: 8px;
  border-radius: 999px;
  background: #e5eefc;
  overflow: hidden;
  margin: 12px 0;
}

.progress > span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue), #60a5fa);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 999px;
  background: #eff6ff;
  color: var(--blue-2);
  font-size: 0.82rem;
  font-weight: 700;
}

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

.timeline-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 14px;
  align-items: center;
}

.timeline-track {
  height: 8px;
  border-radius: 999px;
  background: #e5eefc;
  overflow: hidden;
}

.timeline-track span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--blue), #8bcbff);
}

.story-scene {
  width: 100%;
}

.story-art {
  position: relative;
  height: 240px;
  border-radius: 16px;
  overflow: hidden;
  background: linear-gradient(180deg, #9fd0ff 0%, #dff2ff 62%, #b7e3a6 62%, #94d48a 100%);
  border: 1px solid rgba(37, 99, 235, 0.12);
}

.story-sky,
.story-ground,
.story-animal,
.story-character {
  position: absolute;
}

.story-sky {
  inset: 0 0 auto 0;
  height: 64%;
}

.story-ground {
  inset: auto 0 0 0;
  height: 38%;
  background: linear-gradient(180deg, rgba(117, 196, 104, 0.7), rgba(86, 171, 78, 0.95));
}

.story-animal.giraffe {
  left: 58%;
  bottom: 18%;
  width: 58px;
  height: 120px;
  background: linear-gradient(180deg, #f5c76b 0%, #e0a64b 100%);
  border-radius: 24px 24px 18px 18px;
  box-shadow: inset 0 0 0 6px rgba(255, 255, 255, 0.18);
}

.story-animal.zebra {
  left: 40%;
  bottom: 17%;
  width: 62px;
  height: 88px;
  background: repeating-linear-gradient(90deg, #fff 0 10px, #1f2937 10px 16px);
  border-radius: 20px;
}

.story-animal.elephant {
  left: 74%;
  bottom: 16%;
  width: 86px;
  height: 70px;
  background: #8fb4d8;
  border-radius: 36px 36px 30px 30px;
}

.story-character {
  width: 36px;
  height: 56px;
  border-radius: 50% 50% 18px 18px;
  background: #f3c7a7;
  bottom: 18%;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
}

.story-character.milo {
  left: 22%;
  background: linear-gradient(180deg, #2d6cdf 0%, #1746aa 100%);
}

.story-character.lucy {
  left: 28%;
  background: linear-gradient(180deg, #ff8ab4 0%, #e4558d 100%);
}

.tab {
  background: rgba(255, 255, 255, 0.8);
}

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

.list-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 16px;
  border-radius: 12px;
  background: #f8fbff;
  border: 1px solid var(--line);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.label {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: #e0f2fe;
  color: #075985;
  font-size: 0.78rem;
  font-weight: 800;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.toggle {
  display: inline-flex;
  border-radius: 999px;
  padding: 4px;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--line);
}

.toggle button {
  border: 0;
  background: transparent;
  padding: 9px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.toggle button.active {
  background: var(--blue);
  color: white;
}

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

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    position: static;
    height: auto;
  }

  .hero-grid,
  .grid-2,
  .split {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-direction: column;
  }

  .topbar-metrics {
    grid-auto-flow: row;
    width: 100%;
  }
}

@media (max-width: 720px) {
  .main,
  .sidebar {
    padding: 16px;
  }

  .topbar h1 {
    font-size: 1.55rem;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }
}

.overview-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap: 18px;
}

.overview-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.overview-stat {
  padding: 18px;
  border-radius: 14px;
  background: white;
  border: 1px solid var(--line);
}

.overview-stat .metric-value {
  font-size: 1.55rem;
}

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

.mission-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.mission-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.skill-row {
  margin-bottom: 12px;
}

.skill-row-head {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
}

.is-admin {
  background: #f4f6f8;
}

.is-admin body,
body:has(.is-admin) {
  background: #f4f6f8;
}

body.is-admin {
  background: #f4f6f8;
  color: #111827;
}

body.is-admin .app-shell {
  background: #f4f6f8;
}

body.is-admin .sidebar {
  background: #f3f4f6;
  border-right: 1px solid #e5e7eb;
  backdrop-filter: none;
  padding: 20px 16px;
  gap: 16px;
}

body.is-admin .brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: #2563eb;
  color: #fff;
  flex: 0 0 auto;
}

body.is-admin .brand-name {
  font-size: 1rem;
  font-weight: 800;
}

body.is-admin .brand-subtitle,
body.is-admin .eyebrow,
body.is-admin .muted,
body.is-admin .nav-desc {
  color: #6b7280;
}

body.is-admin .nav {
  gap: 4px;
}

body.is-admin .nav-group {
  display: grid;
  gap: 4px;
}

body.is-admin .nav-group-label {
  margin: 16px 8px 6px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: #9ca3af;
}

body.is-admin .nav-item,
body.is-admin .chip,
body.is-admin .metric-card,
body.is-admin .card,
body.is-admin .tab,
body.is-admin .action-btn,
body.is-admin .primary-btn,
body.is-admin .segment {
  box-shadow: none;
}

body.is-admin .nav-item {
  border: 0;
  background: transparent;
  border-radius: 10px;
  padding: 10px 12px;
}

body.is-admin .nav-item.active {
  background: #2563eb;
  color: #fff;
  box-shadow: none;
  border-color: transparent;
}

body.is-admin .nav-item.active .nav-desc {
  color: rgba(255, 255, 255, 0.78);
}

body.is-admin .nav-title {
  font-weight: 700;
  font-size: 0.94rem;
}

body.is-admin .nav-desc {
  font-size: 0.75rem;
  margin-top: 2px;
}

body.is-admin .sidebar-footer {
  margin-top: auto;
  padding: 12px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid #e5e7eb;
}

body.is-admin .admin-user {
  display: flex;
  align-items: center;
  gap: 10px;
}

body.is-admin .admin-user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  background: #dbeafe;
  color: #1d4ed8;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 0.8rem;
}

body.is-admin .main {
  padding: 28px 32px;
  background: #f4f6f8;
}

body.is-admin .topbar h1 {
  font-size: 1.7rem;
  margin: 2px 0 6px;
}

body.is-admin .topbar p {
  max-width: 640px;
  color: #6b7280;
}

body.is-admin .role-select,
body.is-admin #resetDemo {
  height: 40px;
  border-radius: 8px;
  background: #fff;
  border: 1px solid #d1d5db;
}

body.is-admin .topbar-metrics {
  display: none;
}

body.is-admin .content {
  gap: 16px;
}

body.is-admin .hero,
body.is-admin .card,
body.is-admin .band {
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
  border: 1px solid #e5e7eb;
  background: #fff;
  border-radius: 12px;
}

body.is-admin .admin-panel {
  padding: 18px 20px 8px;
}

body.is-admin .admin-panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

body.is-admin .admin-panel-head h3 {
  margin: 0;
  font-size: 1rem;
}

body.is-admin .admin-count {
  color: #6b7280;
  font-weight: 600;
}

body.is-admin .admin-add {
  border: 0;
  background: #2563eb;
  color: #fff;
  border-radius: 8px;
  padding: 9px 14px;
  font-weight: 700;
  cursor: pointer;
}

body.is-admin .admin-add:hover {
  background: #1d4ed8;
}

body.is-admin .admin-toolbar {
  display: grid;
  grid-template-columns: 1fr 180px 180px;
  gap: 10px;
  margin-bottom: 14px;
}

body.is-admin .admin-toolbar input,
body.is-admin .admin-toolbar select {
  height: 40px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  background: #fff;
  padding: 0 12px;
  color: #111827;
}

body.is-admin .admin-table-wrap {
  overflow: auto;
}

body.is-admin table.admin-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

body.is-admin .admin-table th {
  text-align: left;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: #6b7280;
  font-weight: 800;
  padding: 12px 10px;
  border-bottom: 1px solid #e5e7eb;
  white-space: nowrap;
}

body.is-admin .admin-table td {
  padding: 14px 10px;
  border-bottom: 1px solid #f3f4f6;
  vertical-align: middle;
  font-size: 0.92rem;
}

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

body.is-admin .admin-link {
  color: #2563eb;
  font-weight: 700;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

body.is-admin .badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 800;
}

body.is-admin .badge-blue { background: #dbeafe; color: #1d4ed8; }
body.is-admin .badge-yellow { background: #fef3c7; color: #92400e; }
body.is-admin .badge-green { background: #dcfce7; color: #166534; }
body.is-admin .badge-amber { background: #ffedd5; color: #9a3412; }
body.is-admin .badge-gray { background: #f3f4f6; color: #374151; }

body.is-admin .icon-btn {
  width: 32px;
  height: 32px;
  border: 0;
  background: transparent;
  color: #dc2626;
  border-radius: 8px;
  cursor: pointer;
}

body.is-admin .icon-btn:hover {
  background: #fef2f2;
}

body.is-admin .admin-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

body.is-admin .admin-stat {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 18px;
}

body.is-admin .admin-stat .metric-value {
  font-size: 1.6rem;
}

body.is-admin .admin-shortcuts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

body.is-admin .admin-shortcut {
  text-align: left;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 16px;
  cursor: pointer;
}

body.is-admin .admin-shortcut:hover {
  border-color: #93c5fd;
}

body.is-admin .admin-shortcut strong {
  display: block;
  margin-bottom: 4px;
}

body.is-admin .admin-back {
  border: 1px solid #d1d5db;
  background: #fff;
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  font-weight: 700;
  color: #374151;
}

body.is-admin .grade-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

body.is-admin .grade-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 16px;
}

body.is-admin .grade-meta {
  display: grid;
  gap: 10px;
  margin: 16px 0;
}

body.is-admin .grade-meta div {
  display: grid;
  gap: 4px;
}

body.is-admin .grade-meta span {
  color: #6b7280;
  font-size: 0.78rem;
  font-weight: 700;
}

body.is-admin .grade-task,
body.is-admin .grade-answer {
  padding: 14px;
  border-radius: 10px;
  background: #f8fafc;
  border: 1px solid #e5e7eb;
}

body.is-admin .grade-question {
  display: grid;
  gap: 4px;
  padding: 10px 0;
  border-bottom: 1px solid #e5e7eb;
}

body.is-admin .grade-question:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

body.is-admin .grade-answer {
  margin-bottom: 16px;
}

body.is-admin .grade-answer strong {
  display: block;
  margin-top: 6px;
  font-size: 1.05rem;
}

body.is-admin .grade-form {
  display: grid;
  gap: 8px;
}

body.is-admin .grade-form label {
  font-size: 0.8rem;
  font-weight: 700;
  color: #6b7280;
}

body.is-admin .grade-form select,
body.is-admin .grade-form textarea {
  width: 100%;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  padding: 10px 12px;
  background: #fff;
}

body.is-admin .lesson-form {
  display: grid;
  gap: 14px;
}

body.is-admin .lesson-form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

body.is-admin .lesson-form label {
  display: grid;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  color: #6b7280;
}

body.is-admin .lesson-form input,
body.is-admin .lesson-form select,
body.is-admin .lesson-form textarea {
  width: 100%;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  padding: 10px 12px;
  background: #fff;
  color: #111827;
  font-weight: 500;
}

body.is-admin .lesson-form input[readonly] {
  background: #f8fafc;
  color: #6b7280;
}

body.is-admin .media-section {
  display: grid;
  gap: 12px;
}

body.is-admin .media-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

body.is-admin .media-field {
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 12px;
  background: #f8fafc;
  display: grid;
  gap: 8px;
}

body.is-admin .media-field-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: baseline;
}

body.is-admin .media-preview {
  min-height: 120px;
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
  border: 1px solid #e5e7eb;
  display: grid;
  place-items: center;
}

body.is-admin .media-preview img,
body.is-admin .media-preview video {
  width: 100%;
  height: 160px;
  object-fit: cover;
  display: block;
}

body.is-admin .media-preview audio {
  width: calc(100% - 16px);
  margin: 24px 8px;
}

body.is-admin .media-empty {
  color: #6b7280;
  font-size: 0.85rem;
  padding: 24px 12px;
  text-align: center;
}

body.is-admin .media-field input[type="file"] {
  padding: 8px;
  background: #fff;
}

@media (max-width: 1100px) {
  .overview-grid,
  body.is-admin .admin-stats,
  body.is-admin .admin-shortcuts,
  body.is-admin .admin-toolbar,
  body.is-admin .grade-layout,
  body.is-admin .lesson-form-grid,
  body.is-admin .media-grid {
    grid-template-columns: 1fr;
  }

  .overview-stats {
    grid-template-columns: 1fr 1fr;
  }
}

body.is-login {
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.16), transparent 34%),
    linear-gradient(180deg, #f5f9ff 0%, #eaf2ff 100%);
}

body.is-login .app-shell {
  grid-template-columns: 1fr;
}

body.is-login .sidebar,
body.is-login .topbar,
body.is-login .topbar-metrics {
  display: none;
}

body.is-login .main {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px;
}

body.is-login .content {
  width: min(440px, 100%);
}

.login-screen {
  width: 100%;
}

.login-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 36px 32px 28px;
  text-align: center;
}

.login-brand {
  font-size: 1.45rem;
  font-weight: 800;
}

.login-lead {
  margin: 8px 0 24px;
  color: var(--muted);
}

.login-actions {
  display: grid;
  gap: 12px;
}

.login-btn {
  height: 52px;
  border-radius: 14px;
  border: 1px solid var(--line);
  font-weight: 800;
  cursor: pointer;
}

.login-btn-student {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}

.login-btn-student:hover {
  background: var(--blue-2);
}

.login-btn-admin {
  background: #fff;
  color: var(--text);
}

.login-btn-admin:hover {
  border-color: rgba(37, 99, 235, 0.35);
  background: #f8fbff;
}

.login-credit {
  margin: 22px 0 0;
  color: #8a9bb8;
  font-size: 0.82rem;
}

body.is-admin .logout-btn {
  border-radius: 8px;
  background: #fff;
  border: 1px solid #e5e7eb;
}

/* ============================================================
   Trang học tương tác của một buổi (6 task bấm mở được)
   ============================================================ */

.task-run {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.task-panel {
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  border-radius: var(--radius-sm);
  background: white;
  overflow: hidden;
  transition: box-shadow 0.18s ease;
}

.task-panel.intro { border-left-color: var(--blue); }
.task-panel.repeat { border-left-color: var(--amber); }
.task-panel.phonics { border-left-color: #7c3aed; }
.task-panel.milestone { border-left-color: #dc2626; }
.task-panel.open { box-shadow: 0 10px 30px rgba(13, 42, 89, 0.1); }
.task-panel.done .task-index { background: var(--green); color: white; }

.task-panel-head {
  width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

.task-panel-head:hover { background: #f8fbff; }
.task-panel.open .task-panel-head { background: #f4f9ff; }

.task-panel-title {
  flex: 1;
  min-width: 0;
  display: block;
}

.task-panel-title strong { display: block; font-size: 14px; }

.task-panel-title .muted {
  display: block;
  font-size: 13px;
  line-height: 1.5;
  margin-top: 2px;
}

.task-panel-body {
  padding: 4px 14px 16px;
  border-top: 1px dashed var(--line);
}

.task-panel-body > p.muted { margin: 12px 0; font-size: 13px; }

.task-nav { margin-top: 16px; }
.task-nav .ghost-btn[disabled] { opacity: 0.45; cursor: default; }

/* --- Video nhúng --- */
.media-card {
  margin: 12px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #f8fbff;
}

/* --crop: phần mép trên bị cắt bỏ, để giấu thanh tiêu đề của YouTube khi bé
   tạm dừng giữa chừng. Đổi một số này là cả khung tự tính lại. */
.media-frame {
  --crop: .12;
  position: relative;
  padding-top: calc(56.25% * (1 - var(--crop)));
  background: #0e1a33;
  overflow: hidden;
}

/* Iframe cao hơn khung rồi kéo ngược lên: mép trên tràn ra ngoài và bị cắt,
   mép dưới vẫn khớp đúng khung nên không mất thanh điều khiển. */
.media-frame iframe {
  position: absolute;
  left: 0;
  width: 100%;
  top: calc(-100% * var(--crop) / (1 - var(--crop)));
  height: calc(100% / (1 - var(--crop)));
  border: 0;
}

/* Player nhỏ thì thanh tiêu đề chiếm tỉ lệ cao hơn, phải cắt sâu hơn một chút. */
@media (max-width: 700px) {
  .media-frame { --crop: .17; }
}

/* Ảnh bìa + nút play của mình, đè kín khung khi chưa bấm. */
.media-poster {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* Kéo điểm neo xuống để ảnh bìa lộ đúng phần hình mà iframe sẽ chiếu,
     bấm play không bị nhảy hình. */
  object-position: center 64%;
  display: block;
}

.media-play {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  padding: 0;
  cursor: pointer;
  background: rgba(6, 18, 40, .28);
  transition: background .18s ease;
}

.media-play:hover { background: rgba(6, 18, 40, .12); }

/* Tam giác play dựng bằng border, không cần ảnh. */
.media-play span {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .94);
  box-shadow: 0 8px 24px rgba(6, 18, 40, .35);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform .18s ease;
}

.media-play span::before {
  content: "";
  margin-left: 5px;
  border-style: solid;
  border-width: 12px 0 12px 20px;
  border-color: transparent transparent transparent var(--blue);
}

.media-play:hover span { transform: scale(1.08); }
.media-play:focus-visible { outline: 3px solid var(--blue); outline-offset: -3px; }

.media-note { padding: 10px 12px; font-size: 12px; }

/* --- Nút nghe đọc mẫu --- */
.say-btn {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: white;
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.2;
}

.say-btn:hover { border-color: var(--blue); background: var(--blue-soft); }
.say-btn:active { transform: scale(0.96); }

.say-list { display: grid; gap: 8px; margin: 12px 0; }

.say-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: white;
  font-size: 14px;
}

/* --- Thẻ từ vựng --- */
.flash-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 8px;
  margin: 12px 0;
}

.flash-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: white;
  cursor: pointer;
  font: inherit;
  color: inherit;
  text-align: left;
}

.flash-card:hover { border-color: var(--blue); background: #f4f9ff; }
.flash-card.heard { border-color: var(--green); background: color-mix(in srgb, var(--green) 8%, white); }
.flash-word { font-weight: 700; font-size: 14px; }
.flash-icon { opacity: 0.6; font-size: 13px; }

/* --- Câu hỏi tương tác --- */
.quiz-block {
  margin: 12px 0;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fbfdff;
}

.quiz-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
  font-size: 14px;
}

.choice-row { display: flex; flex-wrap: wrap; gap: 8px; }

.choice-btn {
  border: 1px solid var(--line);
  background: white;
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  color: inherit;
}

.choice-btn:hover { border-color: var(--blue); background: var(--blue-soft); }

.choice-btn.ok {
  border-color: var(--green);
  background: var(--green);
  color: white;
}

.choice-btn.miss {
  border-color: #dc2626;
  background: #dc2626;
  color: white;
}

.choice-feedback {
  margin-top: 10px;
  font-size: 13px;
  font-weight: 600;
}

.choice-feedback.ok { color: var(--green); }
.choice-feedback.miss { color: #dc2626; }

/* --- Bảng chữ phonics --- */
.letter-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }

.letter-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-width: 62px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: white;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

.letter-tile:hover { border-color: #7c3aed; background: #f8f5ff; }
.letter-main { font-size: 22px; font-weight: 800; color: #7c3aed; line-height: 1; }
.letter-sample { font-size: 11px; color: var(--muted); }

/* --- Ghi âm --- */
.record-play { display: block; width: 100%; margin-top: 12px; }

.primary-btn.recording {
  background: #dc2626;
  border-color: #dc2626;
  animation: record-pulse 1.1s ease-in-out infinite;
}

@keyframes record-pulse {
  50% { opacity: 0.68; }
}

.finish-band {
  margin-top: 14px;
  background: color-mix(in srgb, var(--green) 10%, white);
  border: 1px solid color-mix(in srgb, var(--green) 35%, white);
}