:root {
  --paper: #f7efe0;
  --paper-deep: #ead8bd;
  --ink: #211b16;
  --muted: #6d6257;
  --line: #dec9aa;
  --orange: #ef6d2f;
  --red: #c83e2a;
  --green: #76896a;
  --white: #fffaf0;
  --shadow: 0 24px 80px rgba(69, 42, 18, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Songti SC", "STSong", "Noto Serif SC", Georgia, serif;
  background:
    radial-gradient(circle at 18% 10%, rgba(118, 137, 106, 0.2), transparent 28rem),
    radial-gradient(circle at 82% 0%, rgba(239, 109, 47, 0.18), transparent 30rem),
    linear-gradient(135deg, #f8f0df, #efe0c6);
}

button {
  font: inherit;
}

.app-shell {
  width: min(1440px, 100%);
  margin: 0 auto;
  padding: 28px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 24px;
  align-items: end;
  margin-bottom: 24px;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(34px, 4.8vw, 68px);
  letter-spacing: -0.08em;
  line-height: 0.96;
}

.hero p,
p {
  color: var(--muted);
  line-height: 1.7;
}

.hero p {
  max-width: 800px;
  margin: 0;
  font-size: 18px;
}

.hero-note,
.panel,
.boundary-card,
.student-item,
.metric-grid article,
.state-box,
.reason-box,
.priority-card,
.copy-card,
.follow-card,
.risk-card {
  border: 1px solid var(--line);
  background: rgba(255, 250, 240, 0.78);
  box-shadow: var(--shadow);
}

.hero-note {
  padding: 18px;
}

.hero-note strong {
  display: block;
  margin-bottom: 8px;
  color: var(--red);
}

.hero-note span {
  display: block;
  color: var(--muted);
  line-height: 1.6;
}

.hero-note a {
  display: block;
  margin-top: 12px;
  padding: 10px 12px;
  background: var(--ink);
  color: var(--white);
  text-align: center;
  text-decoration: none;
}

.workspace {
  display: grid;
  grid-template-columns: 320px minmax(360px, 1fr) minmax(380px, 0.9fr);
  gap: 18px;
}

.panel {
  min-height: 720px;
  padding: 20px;
}

.panel-title {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.panel-title span {
  color: var(--red);
}

.panel-title strong {
  font-size: 22px;
  letter-spacing: -0.04em;
}

.boundary-card,
.state-box,
.reason-box,
.copy-card,
.follow-card {
  padding: 16px;
  margin-bottom: 14px;
  background: #fff8e9;
}

.boundary-card strong {
  color: var(--red);
}

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

.student-item {
  width: 100%;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 4px 10px;
  text-align: left;
  padding: 14px;
  color: var(--ink);
  cursor: pointer;
}

.student-item span {
  grid-row: span 2;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: var(--green);
  color: var(--white);
  font-size: 13px;
}

.student-item strong {
  font-size: 18px;
}

.student-item em {
  color: var(--muted);
  font-style: normal;
  font-size: 13px;
}

.student-item.active {
  background: var(--ink);
  color: var(--white);
}

.student-item.active em {
  color: rgba(255, 250, 240, 0.72);
}

.student-detail {
  margin-bottom: 16px;
  padding: 18px;
  background:
    linear-gradient(135deg, rgba(255, 248, 233, 0.96), rgba(242, 220, 183, 0.82));
  border: 1px solid var(--line);
}

.student-detail h2 {
  margin: 0 0 8px;
  font-size: 34px;
  letter-spacing: -0.06em;
}

.student-detail p {
  margin: 0;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.metric-grid article {
  padding: 14px;
  background: #fff8e9;
}

.metric-grid span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.metric-grid strong {
  display: block;
  margin-top: 8px;
  color: var(--red);
  font-size: 28px;
}

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

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

.tags span {
  padding: 8px 10px;
  background: var(--green);
  color: var(--white);
  font-size: 13px;
}

.reason-box p,
.copy-card p,
.follow-card p {
  margin: 0;
}

.priority-card {
  padding: 18px;
  margin-bottom: 14px;
  background:
    linear-gradient(135deg, var(--ink), #57402a);
}

.priority-card span {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 14px;
  background: var(--orange);
  color: var(--white);
}

.priority-card strong {
  display: block;
  color: var(--white);
  font-size: 30px;
  letter-spacing: -0.06em;
}

.priority-card p {
  margin: 8px 0 0;
  color: rgba(255, 250, 240, 0.78);
}

.copy-card p {
  white-space: pre-line;
  font-size: 18px;
}

.risk-card {
  display: none;
  padding: 16px;
  background: #c83e2a;
}

.risk-card.show {
  display: block;
}

.risk-card strong,
.risk-card p {
  color: var(--white);
}

.risk-card p {
  margin: 6px 0 0;
}

.error {
  color: var(--red);
}

@media (max-width: 1180px) {
  .hero,
  .workspace {
    grid-template-columns: 1fr;
  }

  .panel {
    min-height: auto;
  }
}

@media (max-width: 720px) {
  .app-shell {
    padding: 16px;
  }

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