:root {
  --bg: #f5f5f7;
  --bg-secondary: #fbfbfd;
  --surface: #ffffff;
  --surface-muted: #f9f9fb;
  --text: #111827;
  --text-soft: #6b7280;
  --text-faint: #9ca3af;
  --primary: #0a84ff;
  --primary-soft: rgba(10, 132, 255, 0.12);
  --success-soft: rgba(22, 163, 74, 0.1);
  --warning-soft: rgba(245, 158, 11, 0.14);
  --shadow-soft: 0 2px 10px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 18px 48px rgba(15, 23, 42, 0.06);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(10, 132, 255, 0.1), transparent 28%),
    radial-gradient(circle at 85% 18%, rgba(255, 255, 255, 0.9), transparent 24%),
    linear-gradient(180deg, #f7f7f9 0%, #f5f5f7 42%, #f2f3f5 100%);
  color: var(--text);
  font-family:
    -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

button {
  cursor: pointer;
  border: none;
}

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

.page-shell {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
}

.page-glow {
  position: absolute;
  border-radius: 999px;
  filter: blur(36px);
  opacity: 0.55;
  pointer-events: none;
}

.page-glow-a {
  top: 72px;
  left: -48px;
  width: 240px;
  height: 240px;
  background: rgba(10, 132, 255, 0.12);
}

.page-glow-b {
  right: -72px;
  bottom: 96px;
  width: 320px;
  height: 320px;
  background: rgba(255, 255, 255, 0.72);
}

.teacher-app {
  position: relative;
  z-index: 1;
  width: min(1440px, calc(100vw - 40px));
  margin: 0 auto;
  padding: 24px 0 40px;
}

.hidden {
  display: none !important;
}

.shell-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
}

.glass-bar {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
  box-shadow: var(--shadow-soft);
}

.eyebrow {
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.status-text {
  min-height: 20px;
  font-size: 13px;
  color: var(--text-soft);
}

.auth-screen {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(360px, 420px);
  gap: 32px;
  min-height: calc(100vh - 64px);
  padding: 40px;
  align-items: center;
}

.auth-copy {
  padding: 12px 8px;
}

.auth-copy h1 {
  max-width: 760px;
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.lede {
  max-width: 620px;
  margin-top: 24px;
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-soft);
}

.info-stack {
  display: grid;
  gap: 14px;
  margin-top: 28px;
  max-width: 520px;
}

.glass-note {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-soft);
  color: var(--text-soft);
}

.glass-note strong {
  color: var(--text);
  font-weight: 600;
}

.auth-card {
  display: grid;
  gap: 18px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.92);
  border-radius: 24px;
  box-shadow: 0 22px 44px rgba(15, 23, 42, 0.08);
}

.auth-card h2,
.section-head h2,
.hero-card h2 {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

label {
  display: grid;
  gap: 8px;
  color: var(--text-soft);
  font-size: 14px;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid rgba(209, 213, 219, 0.7);
  border-radius: 16px;
  background: var(--bg-secondary);
  padding: 14px 16px;
  color: var(--text);
  outline: none;
  transition: all 300ms ease-in-out;
}

textarea {
  min-height: 116px;
  resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
  border-color: rgba(10, 132, 255, 0.4);
  box-shadow: 0 0 0 4px rgba(10, 132, 255, 0.1);
  background: #fff;
}

.primary-btn,
.secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 16px;
  transition: all 300ms ease-in-out;
}

.primary-btn {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 10px 24px rgba(10, 132, 255, 0.18);
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.88);
  color: var(--text);
  box-shadow: var(--shadow-soft);
}

.primary-btn:hover,
.secondary-btn:hover,
.metric-card:hover,
.topic-card:hover,
.history-card:hover,
.meta-card:hover,
.step-card:hover,
.review-card:hover,
.message:hover,
.session-tile:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.08);
}

.primary-btn:disabled,
.secondary-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.compact-btn {
  min-height: 40px;
  padding: 0 16px;
  border-radius: 14px;
  font-size: 14px;
}

.topbar {
  position: sticky;
  top: 16px;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  padding: 18px 24px;
  border-radius: 24px;
}

.topbar h1 {
  font-size: 34px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.topbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.profile-chip {
  padding: 12px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow-soft);
  color: var(--text-soft);
  font-size: 14px;
}

.hero-grid,
.training-hero-grid {
  display: grid;
  gap: 20px;
  margin-top: 20px;
}

.hero-grid {
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.92fr);
}

.training-hero-grid {
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
}

.hero-card,
.metric-grid,
.section-card {
  padding: 28px;
}

.hero-card p:last-child {
  margin-top: 14px;
  line-height: 1.85;
  color: var(--text-soft);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.metric-card,
.topic-card,
.history-card,
.meta-card,
.step-card,
.review-card,
.message,
.session-tile {
  border-radius: 20px;
  background: var(--surface-muted);
  box-shadow: var(--shadow-soft);
  transition: all 300ms ease-in-out;
}

.metric-card,
.topic-card,
.history-card,
.meta-card,
.step-card,
.review-card,
.session-tile {
  padding: 20px;
}

.metric-card strong {
  display: block;
  margin-top: 10px;
  font-size: 34px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.metric-card p,
.topic-card p,
.history-card p,
.meta-card p,
.step-card p,
.review-card p {
  margin-top: 8px;
  color: var(--text-soft);
  line-height: 1.8;
}

.lobby-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.92fr);
  gap: 20px;
  margin-top: 20px;
}

.lobby-side,
.training-side {
  display: grid;
  gap: 20px;
}

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

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

.topic-list,
.history-list,
.step-list {
  display: grid;
  gap: 14px;
}

.topic-card h3,
.history-card h3,
.step-card h3,
.review-card h3 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.topic-group {
  display: grid;
  gap: 12px;
}

.scenario-quick-list {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.scenario-chip-btn {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow-soft);
  transition: all 300ms ease-in-out;
  text-align: left;
}

.scenario-chip-btn strong {
  display: block;
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
}

.scenario-chip-btn span {
  display: block;
  margin-top: 4px;
  color: var(--text-soft);
  font-size: 13px;
  line-height: 1.6;
}

.scenario-chip-btn:hover,
.scenario-chip-btn.is-active {
  transform: translateY(-4px);
  background: rgba(10, 132, 255, 0.08);
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.08);
}

.tag-row,
.summary-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.tag,
.tag-warn,
.step-badge {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.tag,
.step-badge {
  background: var(--primary-soft);
  color: var(--primary);
}

.tag-warn {
  background: var(--warning-soft);
  color: #b45309;
}

.scenario-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.step-card.active-step {
  background: rgba(10, 132, 255, 0.08);
  box-shadow: inset 0 0 0 1px rgba(10, 132, 255, 0.14), var(--shadow-soft);
}

.step-card.done-step {
  background: var(--success-soft);
}

.step-card-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.history-actions {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 16px;
}

.session-overview {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.session-tile p:last-child {
  margin-top: 10px;
  color: var(--text);
  font-weight: 600;
}

.chat-log {
  display: grid;
  gap: 14px;
  margin-top: 18px;
  min-height: 240px;
  max-height: 540px;
  overflow-y: auto;
  padding-right: 4px;
}

.message {
  max-width: 88%;
  padding: 18px 20px;
}

.message.teacher {
  justify-self: end;
  background: rgba(10, 132, 255, 0.08);
}

.message.ai {
  justify-self: start;
  background: rgba(255, 255, 255, 0.98);
}

.message.pending-message {
  color: var(--text-soft);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: inset 0 0 0 1px rgba(10, 132, 255, 0.1), var(--shadow-soft);
  animation: messagePulse 1.4s ease-in-out infinite;
}

.message-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  color: var(--text-faint);
  font-size: 12px;
}

.message-content {
  color: var(--text);
  line-height: 1.85;
  white-space: pre-wrap;
  word-break: break-word;
}

@keyframes messagePulse {
  0%,
  100% {
    opacity: 0.72;
  }

  50% {
    opacity: 1;
  }
}

.composer-card {
  margin-top: 18px;
  padding: 18px;
  border-radius: 22px;
  background: var(--surface-muted);
  box-shadow: var(--shadow-soft);
}

.composer-actions {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-top: 14px;
}

.review-hero {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}

.score-card {
  display: grid;
  align-content: center;
  justify-items: center;
  min-height: 220px;
  padding: 24px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(10, 132, 255, 0.12), rgba(255, 255, 255, 0.96));
  box-shadow: var(--shadow-soft);
}

.score-card strong {
  margin-top: 10px;
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.review-step-list {
  display: grid;
  gap: 14px;
  margin-top: 16px;
}

.review-step-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.review-step-score {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--primary);
}

.empty-state {
  padding: 24px;
  border-radius: 20px;
  background: var(--surface-muted);
  color: var(--text-soft);
  line-height: 1.8;
}

@media (max-width: 1200px) {
  .auth-screen,
  .hero-grid,
  .lobby-grid,
  .training-hero-grid,
  .review-hero,
  .review-grid {
    grid-template-columns: 1fr;
  }

  .metric-grid,
  .scenario-meta,
  .session-overview {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .teacher-app {
    width: calc(100vw - 20px);
    padding-top: 12px;
  }

  .auth-screen,
  .hero-card,
  .metric-grid,
  .section-card {
    padding: 20px;
  }

  .auth-copy h1 {
    font-size: 38px;
  }

  .topbar,
  .topbar-actions,
  .section-head,
  .inline-actions,
  .history-actions,
  .composer-actions,
  .glass-note,
  .scenario-chip-btn {
    align-items: stretch;
    flex-direction: column;
  }

  .message {
    max-width: 100%;
  }
}