body { background: var(--paper); }
.hub-shell { min-height: 100vh; }
.hub-top {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 clamp(22px, 4vw, 64px);
  border-bottom: 1px solid var(--line-strong);
  background: var(--surface);
}
.hub-brand { display: flex; align-items: center; gap: 12px; }
.hub-meta { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 12px; }
.hub-main { width: min(100%, 1480px); margin: 0 auto; padding: 0 clamp(22px, 5vw, 76px) 80px; }
.hero {
  min-height: 520px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(420px, .9fr);
  align-items: center;
  gap: clamp(40px, 7vw, 110px);
  border-bottom: 1px solid var(--line-strong);
}
.hero-kicker { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; color: var(--solar); }
.hero-kicker::before { content: ''; width: 28px; height: 2px; background: currentColor; }
.hero h1 { max-width: 780px; margin: 0; font-stretch: 106%; font-size: clamp(48px, 5.4vw, 82px); font-weight: 520; letter-spacing: -.055em; line-height: .98; }
.hero h1 em { color: var(--muted); font-style: normal; }
.hero-copy { max-width: 660px; margin: 24px 0 0; color: var(--ink-soft); font-size: 17px; line-height: 1.6; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.hero-actions .btn { min-height: 46px; padding: 0 18px; }

.coordinate-card {
  position: relative;
  min-height: 370px;
  padding: 28px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-lift);
  overflow: hidden;
}
.coordinate-card::before { content: ''; position: absolute; inset: 0; pointer-events: none; background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 32px 32px; opacity: .18; }
.coordinate-title { position: relative; display: flex; align-items: baseline; justify-content: space-between; gap: 20px; padding-bottom: 14px; border-bottom: 1px solid var(--line-strong); }
.coordinate-title h2 { margin: 0; font-size: 16px; }
.room-track { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 35px; }
.room-node { min-height: 76px; display: grid; place-items: center; gap: 4px; padding: 10px; border: 1px solid var(--line-strong); border-top: 3px solid var(--room-color); border-radius: var(--radius-sm); background: var(--surface-strong); box-shadow: 0 3px 12px rgba(16,24,32,.06); }
.room-node strong { font-stretch: 112%; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.room-node small { color: var(--muted); text-align: center; }
.thread-track { position: relative; margin-top: 36px; padding: 17px 14px; border: 1px solid var(--line-strong); border-radius: var(--radius-sm); background: #101820; color: white; }
.thread-track::before { content: ''; position: absolute; left: 8%; right: 8%; top: -37px; height: 37px; border-left: 1px solid var(--solar); border-right: 1px solid var(--solar); }
.thread-head { display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.thread-id { font: 600 12px/1 var(--font-mono); }
.thread-status { color: #ff8a6c; font-size: 11px; }
.thread-stages { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; margin-top: 13px; }
.thread-stage-mini { height: 5px; border-radius: 4px; background: #52616d; }
.thread-stage-mini.done { background: #2b9b6a; }
.thread-stage-mini.current { background: var(--solar); }
.coordinate-caption { position: relative; margin: 22px 0 0; color: var(--muted); font-size: 12px; }

.hub-section { padding: 60px 0; border-bottom: 1px solid var(--line-strong); }
.section-intro { display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: clamp(30px, 6vw, 90px); margin-bottom: 32px; }
.section-intro h2 { margin: 0; font-stretch: 108%; font-size: 28px; letter-spacing: -.035em; }
.section-intro p { max-width: 720px; margin: 2px 0 0; color: var(--muted); font-size: 15px; line-height: 1.65; }

.scenario-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border: 1px solid var(--line-strong); border-radius: var(--radius-md); background: var(--surface); overflow: hidden; }
.scenario-card { min-height: 212px; display: flex; flex-direction: column; align-items: flex-start; padding: 19px; border-right: 1px solid var(--line); background: transparent; transition: background var(--ease); }
.scenario-card:last-child { border-right: 0; }
.scenario-card:hover { background: var(--surface-strong); }
.scenario-number { color: var(--solar); font: 600 11px/1 var(--font-mono); }
.scenario-card h3 { margin: 29px 0 7px; font-size: 16px; line-height: 1.2; }
.scenario-card p { flex: 1; margin: 0 0 20px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.scenario-link { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); font-weight: 650; }
.scenario-link span { color: var(--solar); }

.thesis-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.thesis-card { min-height: 225px; padding: 22px; border-top: 2px solid var(--ink); background: rgba(255,255,255,.3); }
.thesis-card .caps { color: var(--solar); }
.thesis-card h3 { margin: 15px 0 8px; font-size: 19px; letter-spacing: -.02em; }
.thesis-card p { margin: 0; color: var(--muted); line-height: 1.6; }
.thesis-card ul { margin: 15px 0 0; padding: 0; list-style: none; }
.thesis-card li { position: relative; padding: 6px 0 6px 15px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 12px; }
.thesis-card li::before { content: ''; position: absolute; left: 0; top: 13px; width: 5px; height: 5px; border-radius: 50%; background: var(--solar); }

.test-line { display: grid; grid-template-columns: 170px minmax(0, 1fr) auto; align-items: center; gap: 20px; min-height: 64px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.test-line:last-child { border-bottom: 0; }
.test-name { font-weight: 650; }
.test-question { color: var(--muted); }
.test-mark { color: var(--success); font: 600 11px/1 var(--font-mono); }

.hub-footer { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 34px 0 0; color: var(--muted); font-size: 12px; }
.hub-footer strong { color: var(--ink); }

@media (max-width: 1100px) {
  .hero { grid-template-columns: 1fr; padding: 70px 0; }
  .coordinate-card { min-height: auto; }
  .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .scenario-card { border-bottom: 1px solid var(--line); }
  .scenario-card:nth-child(2n) { border-right: 0; }
  .scenario-card:last-child { grid-column: 1 / -1; border-bottom: 0; }
  .thesis-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .hub-top { align-items: flex-start; padding-top: 15px; padding-bottom: 15px; }
  .hub-meta { flex-direction: column; align-items: flex-end; gap: 2px; }
  .hub-main { padding-left: 18px; padding-right: 18px; }
  .hero { min-height: 0; }
  .hero h1 { font-size: 47px; }
  .hero-copy { font-size: 15px; }
  .coordinate-card { padding: 18px; }
  .room-track { grid-template-columns: repeat(2, 1fr); }
  .thread-track::before { display: none; }
  .section-intro { grid-template-columns: 1fr; gap: 12px; }
  .scenario-grid { grid-template-columns: 1fr; }
  .scenario-card, .scenario-card:nth-child(2n), .scenario-card:last-child { grid-column: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .scenario-card:last-child { border-bottom: 0; }
  .test-line { grid-template-columns: 1fr auto; gap: 7px 18px; padding: 15px 0; }
  .test-question { grid-column: 1 / -1; grid-row: 2; }
  .hub-footer { align-items: flex-start; flex-direction: column; }
}