:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --ink: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --primary: #2563eb;
  --primary-soft: #dbeafe;
  --green: #16a34a;
  --amber: #f59e0b;
  --rose: #e11d48;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
}

.sidebar {
  background: #111827;
  color: #fff;
  padding: 22px 16px;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 28px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: #f97316;
  font-size: 24px;
  font-weight: 800;
}

.brand span {
  display: block;
  color: #cbd5e1;
  font-size: 13px;
  margin-top: 3px;
}

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

.nav-btn {
  border: 0;
  border-radius: var(--radius);
  padding: 12px;
  color: #d1d5db;
  background: transparent;
  text-align: left;
}

.nav-btn.active,
.nav-btn:hover {
  background: #263244;
  color: #fff;
}

.main {
  padding: 26px;
  max-width: 1180px;
  width: 100%;
}

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

.eyebrow {
  margin: 0 0 5px;
  color: var(--primary);
  font-weight: 700;
  font-size: 13px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: 30px;
}

h2 {
  margin-bottom: 0;
  font-size: 20px;
}

.student-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.dashboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 22px;
}

.stat-panel,
.unit-card,
.learn-panel,
.question-card,
.reward-card,
.parent-report {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.stat-panel {
  padding: 18px;
}

.stat-panel span,
.muted {
  color: var(--muted);
  font-size: 14px;
}

.stat-panel strong {
  display: block;
  margin-top: 8px;
  font-size: 26px;
}

.unit-list,
.reward-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.unit-card {
  padding: 18px;
}

.unit-card h3 {
  margin-bottom: 6px;
}

.unit-meta {
  color: var(--muted);
  min-height: 42px;
}

.progress-line {
  height: 8px;
  background: #edf2f7;
  border-radius: 999px;
  overflow: hidden;
  margin: 15px 0;
}

.progress-line span {
  display: block;
  height: 100%;
  background: var(--green);
}

.primary-btn,
.ghost-btn,
.back-btn {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 13px;
  background: #fff;
  color: var(--ink);
}

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

.back-btn {
  margin-bottom: 14px;
}

.unit-hero {
  background: #0f766e;
  color: #fff;
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 14px;
}

.learn-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.learn-panel {
  padding: 18px;
}

.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
}

.word-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: #fafafa;
}

.word-card b {
  display: block;
  font-size: 20px;
}

.word-card small {
  color: var(--muted);
}

.word-actions {
  display: flex;
  gap: 6px;
  margin-top: 10px;
}

.icon-btn {
  min-width: 38px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font-size: 13px;
}

.icon-btn:hover {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.pronunciation-result {
  margin-top: 8px;
  padding: 8px;
  border-radius: var(--radius);
  background: #eef6ff;
  color: #1e3a8a;
  font-size: 13px;
  line-height: 1.5;
}

.phonics-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(17, 24, 39, 0.72);
}

.phonics-phone {
  position: relative;
  width: min(430px, 100%);
  min-height: min(760px, 92vh);
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  gap: 16px;
  overflow: hidden;
  border-radius: 22px;
  background: #fffdf8;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.32);
}

.phonics-phone::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 84px;
  background: linear-gradient(135deg, #ffb703, #f97316);
  z-index: 0;
}

.phonics-close {
  position: absolute;
  right: 14px;
  top: 12px;
  z-index: 2;
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  color: #92400e;
  font-size: 24px;
  line-height: 1;
}

.phonics-top,
.phonics-progress,
.phonics-stage,
.phonics-actions {
  position: relative;
  z-index: 1;
}

.phonics-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 58px 0 22px;
  color: #fff;
}

.phonics-top span {
  font-weight: 800;
}

.phonics-top strong {
  font-size: 12px;
  opacity: 0.88;
}

.phonics-progress {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin: 0 18px;
  padding: 12px;
  border-radius: 999px;
  background: #fff7ed;
  border: 1px solid #fed7aa;
}

.phonics-dot {
  display: grid;
  justify-items: center;
  gap: 4px;
  border: 0;
  background: transparent;
  color: #9ca3af;
  font-size: 11px;
}

.phonics-dot span {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #e5e7eb;
  color: #6b7280;
  font-weight: 800;
}

.phonics-dot.active,
.phonics-dot.done {
  color: #ea580c;
}

.phonics-dot.active span,
.phonics-dot.done span {
  background: #f59e0b;
  color: #fff;
}

.phonics-stage {
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 16px;
  padding: 14px 28px;
  text-align: center;
}

.phonics-word-card {
  width: 100%;
  display: grid;
  justify-items: center;
  gap: 8px;
  padding: 28px 18px;
  border-radius: 18px;
  background: #ffffff;
  border: 1px solid #f3f4f6;
  box-shadow: 0 10px 30px rgba(245, 158, 11, 0.16);
}

.speaker-orb,
.blend-button {
  border: 0;
  border-radius: 999px;
  background: #f59e0b;
  color: #fff;
  font-weight: 800;
}

.speaker-orb {
  width: 62px;
  height: 62px;
  font-size: 24px;
  box-shadow: 0 10px 24px rgba(245, 158, 11, 0.32);
}

.phonics-word-card h2,
.phonics-big,
.sentence-card h2 {
  margin: 0;
  color: #22c55e;
  font-size: 42px;
  letter-spacing: 0;
}

.phonics-word-card p {
  margin: 0;
  color: #6b7280;
}

.phonics-word-card strong {
  color: #374151;
}

.phonics-tip {
  max-width: 320px;
  margin: 0;
  color: #6b7280;
  font-size: 14px;
  line-height: 1.7;
}

.sound-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(54px, 1fr));
  width: 100%;
  gap: 8px;
}

.sound-tile {
  min-height: 88px;
  display: grid;
  place-items: center;
  gap: 2px;
  border: 0;
  border-radius: 12px;
  background: #22c55e;
  color: #fff;
  animation: tile-pop 360ms ease both;
  animation-delay: var(--delay);
}

.sound-tile b {
  font-size: 24px;
}

.sound-tile span,
.sound-tile small {
  font-size: 12px;
}

.sound-tile small {
  min-width: 30px;
  padding: 2px 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.22);
}

.blend-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.blend-line span {
  min-width: 48px;
  padding: 12px 14px;
  border-radius: 12px;
  background: #e0f2fe;
  color: #0369a1;
  font-size: 22px;
  font-weight: 800;
}

.blend-button {
  padding: 12px 20px;
}

.spell-slots {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.spell-slots span {
  width: 38px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  border: 2px solid #facc15;
  background: #fffbeb;
  color: #16a34a;
  font-size: 24px;
  font-weight: 800;
}

.spell-slots span.filled {
  border-color: #22c55e;
  background: #dcfce7;
  animation: tile-pop 220ms ease both;
}

.letter-bank {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.letter-bank button {
  width: 42px;
  height: 40px;
  border: 0;
  border-radius: 10px;
  background: #6366f1;
  color: #fff;
  font-size: 18px;
  font-weight: 800;
}

.letter-bank button.used {
  background: #d1d5db;
  color: #6b7280;
}

.letter-bank button.shake {
  animation: shake 260ms ease;
}

.sentence-card {
  width: 100%;
  display: grid;
  gap: 16px;
  justify-items: center;
  padding: 24px 18px;
  border-radius: 18px;
  background: #ffffff;
  border: 1px solid #e5e7eb;
}

.sentence-card p {
  margin: 0;
  color: #374151;
  font-size: 18px;
  line-height: 1.7;
}

.phonics-actions {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 0 22px 22px;
}

.phonics-actions button {
  flex: 1;
}

@keyframes tile-pop {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.88);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.empty-note {
  color: var(--muted);
  line-height: 1.7;
}

.grammar-item {
  border-left: 4px solid var(--amber);
  padding-left: 12px;
  margin-bottom: 12px;
}

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

.resource-card {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(260px, 520px);
  align-items: center;
  gap: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
}

.resource-card h3 {
  margin: 5px 0 0;
  font-size: 16px;
}

.resource-card audio {
  width: 100%;
}

.resource-type {
  display: inline-block;
  border-radius: 999px;
  background: #ecfdf5;
  color: #047857;
  padding: 4px 8px;
  font-size: 12px;
  font-weight: 700;
}

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

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

.dialogue-card .section-head {
  align-items: flex-start;
  margin-bottom: 10px;
}

.dialogue-lines {
  display: grid;
  gap: 8px;
  margin-bottom: 10px;
}

.dialogue-line {
  display: grid;
  grid-template-columns: 86px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fafafa;
}

.dialogue-line strong {
  color: #0f766e;
}

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

.question-card {
  padding: 16px;
}

.question-card h4 {
  margin: 0 0 12px;
}

.option-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 8px;
}

.option-btn {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.option-btn:hover {
  border-color: var(--primary);
  background: var(--primary-soft);
}

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

.answer-row input {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
}

.feedback {
  margin-top: 10px;
  padding: 10px;
  border-radius: var(--radius);
  background: #f3f4f6;
}

.feedback.correct {
  background: #dcfce7;
  color: #166534;
}

.feedback.wrong {
  background: #ffe4e6;
  color: #9f1239;
}

.reward-card {
  padding: 16px;
}

.reward-card strong {
  display: block;
  font-size: 18px;
  margin-bottom: 5px;
}

.reward-card .cost {
  color: var(--primary);
  font-weight: 800;
}

.history-list,
.weak-list {
  display: grid;
  gap: 8px;
}

.history-item,
.weak-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
}

.admin-panel,
.parent-report {
  padding: 20px;
}

.admin-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.admin-form {
  display: grid;
  grid-template-columns: repeat(4, minmax(140px, 1fr));
  gap: 12px;
  align-items: end;
  margin-bottom: 14px;
}

.admin-form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
}

.admin-form select {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  padding: 0 10px;
}

.source-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
}

.source-box {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: #f8fafc;
  margin-bottom: 14px;
}

.source-manager {
  margin-bottom: 14px;
}

.compact-head {
  margin-bottom: 10px;
}

.source-grid {
  display: grid;
  gap: 8px;
}

.source-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 12px;
}

.source-card p {
  margin-bottom: 0;
}

.danger-btn {
  border: 1px solid #fecdd3;
  border-radius: var(--radius);
  padding: 8px 11px;
  background: #fff1f2;
  color: var(--rose);
}

.danger-btn:hover {
  background: var(--rose);
  border-color: var(--rose);
  color: #fff;
}

.source-box a {
  color: var(--primary);
}

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

.catalog-unit {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 14px;
}

.catalog-unit h3 {
  margin-bottom: 8px;
}

.lesson-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.lesson-tag {
  border-radius: 999px;
  background: #eef2ff;
  color: #3730a3;
  padding: 5px 9px;
  font-size: 13px;
}

.sub-title {
  margin: 22px 0 10px;
}

.toast {
  position: sticky;
  top: 10px;
  z-index: 10;
  margin-bottom: 14px;
  padding: 12px 14px;
  border-radius: var(--radius);
  background: #111827;
  color: #fff;
}

@media (max-width: 760px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    padding: 14px;
  }

  .brand {
    margin-bottom: 12px;
  }

  .nav {
    grid-template-columns: repeat(4, 1fr);
  }

  .nav-btn {
    text-align: center;
    padding: 10px 6px;
  }

  .main {
    padding: 16px;
  }

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

  .dashboard,
  .learn-grid {
    grid-template-columns: 1fr;
  }

  .student-pill {
    flex-direction: column;
    align-items: flex-end;
    gap: 2px;
  }

  .admin-form {
    grid-template-columns: 1fr;
  }

  .dialogue-line {
    grid-template-columns: 1fr auto;
  }

  .dialogue-line strong {
    grid-column: 1 / -1;
  }

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