:root {
  --bg: #06131f;
  --panel: rgba(7, 26, 39, 0.72);
  --panel-strong: rgba(9, 31, 46, 0.92);
  --line: rgba(164, 218, 226, 0.18);
  --text: #eff7f6;
  --muted: #9cc4c8;
  --warm: #ff8f3f;
  --warm-soft: #ffc15d;
  --teal: #4dd4c6;
  --blue: #7bc2ff;
  --danger: #ffb06a;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.24);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 143, 63, 0.16), transparent 28%),
    radial-gradient(circle at 80% 20%, rgba(77, 212, 198, 0.18), transparent 24%),
    linear-gradient(145deg, #04101a 0%, #0a1b2d 52%, #102943 100%);
  overflow-x: hidden;
}

.aurora {
  position: fixed;
  border-radius: 999px;
  filter: blur(50px);
  opacity: 0.35;
  pointer-events: none;
}

.aurora-left {
  top: 10%;
  left: -4rem;
  width: 18rem;
  height: 18rem;
  background: rgba(255, 143, 63, 0.55);
}

.aurora-right {
  top: 30%;
  right: -3rem;
  width: 16rem;
  height: 16rem;
  background: rgba(77, 212, 198, 0.5);
}

.page-shell {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
}

.hero-panel,
.mission-grid,
.feature-layout,
.science-panel {
  display: grid;
  gap: 20px;
}

.hero-panel {
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--warm-soft);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 16px;
  font-size: clamp(3rem, 6vw, 5.4rem);
  line-height: 0.94;
}

.summary {
  max-width: 38rem;
  margin-bottom: 22px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.mode-switch {
  display: inline-flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.mode-button,
.launch-button,
.star {
  border: 0;
  cursor: pointer;
}

.mode-button {
  padding: 12px 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-weight: 600;
  transition: transform 180ms ease, background 180ms ease, color 180ms ease;
}

.mode-button.active,
.mode-button:hover {
  background: linear-gradient(135deg, var(--warm), var(--warm-soft));
  color: #162535;
  transform: translateY(-2px);
}

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

.signal-strip article,
.mission,
.stack-card,
.practice-stage,
.map-card {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.signal-strip article {
  padding: 16px;
  border-radius: 22px;
}

.signal-value {
  display: block;
  margin-bottom: 6px;
  font-size: 1.9rem;
  font-weight: 700;
}

.signal-label {
  color: var(--muted);
  font-size: 0.92rem;
}

.map-card {
  padding: 18px;
  border-radius: 30px;
}

.map-card-header,
.map-footer,
.mission-metrics,
.mode-pills {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.map-card-header,
.map-footer {
  color: var(--muted);
  font-size: 0.88rem;
}

.constellation {
  position: relative;
  height: 380px;
  margin: 16px 0;
  border-radius: 24px;
  background:
    radial-gradient(circle at 30% 30%, rgba(123, 194, 255, 0.1), transparent 26%),
    radial-gradient(circle at 70% 65%, rgba(255, 193, 93, 0.12), transparent 24%),
    rgba(3, 18, 28, 0.8);
  overflow: hidden;
}

.map-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.map-lines path {
  fill: none;
  stroke: rgba(123, 194, 255, 0.32);
  stroke-width: 0.8;
}

.star {
  position: absolute;
  padding: 12px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  box-shadow: 0 0 0 1px rgba(123, 194, 255, 0.16);
}

.star-large {
  font-size: 1rem;
}

.star-medium {
  font-size: 0.92rem;
}

.star-small {
  font-size: 0.82rem;
}

.star-active {
  background: linear-gradient(135deg, rgba(77, 212, 198, 0.88), rgba(123, 194, 255, 0.92));
  color: #072133;
}

.star-warning {
  background: linear-gradient(135deg, rgba(255, 176, 106, 0.9), rgba(255, 143, 63, 0.94));
  color: #2b1d0b;
}

.mission-grid {
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  margin-bottom: 22px;
}

.mission {
  min-height: 220px;
  padding: 20px;
  border-radius: 26px;
}

.spotlight {
  background:
    radial-gradient(circle at top right, rgba(255, 193, 93, 0.14), transparent 28%),
    linear-gradient(160deg, rgba(7, 28, 43, 0.92), rgba(14, 44, 63, 0.88));
}

.mission-tag {
  color: var(--warm-soft);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.mission h2 {
  margin-bottom: 10px;
  font-size: 2rem;
}

.mission h3 {
  margin-bottom: 10px;
  font-size: 1.24rem;
}

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

.mission-metrics {
  margin: 18px 0 18px;
  color: var(--text);
  font-size: 0.92rem;
}

.launch-button {
  padding: 14px 20px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--warm), var(--warm-soft));
  color: #102131;
  font-weight: 700;
}

.feature-layout,
.science-panel {
  grid-template-columns: 0.92fr 1.08fr;
}

.science-panel {
  align-items: stretch;
  margin-bottom: 22px;
}

.science-head,
.curve-lab,
.feynman-lab {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.science-head {
  padding: 24px;
  border-radius: 26px;
}

.science-head h2 {
  max-width: 18rem;
  margin-bottom: 12px;
  font-size: 2rem;
}

.science-head p {
  color: var(--muted);
  line-height: 1.7;
}

.curve-lab {
  padding: 22px;
  border-radius: 26px;
  background:
    linear-gradient(145deg, rgba(77, 212, 198, 0.11), rgba(5, 22, 35, 0.94)),
    var(--panel-strong);
}

.curve-axis {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  color: var(--muted);
  font-size: 0.78rem;
  text-align: center;
}

.curve-track {
  position: relative;
  height: 86px;
  margin: 14px 0 18px;
  border-bottom: 1px solid rgba(164, 218, 226, 0.2);
}

.curve-track::before {
  content: "";
  position: absolute;
  inset: 8px 0 18px;
  border-radius: 999px;
  background:
    linear-gradient(90deg, rgba(77, 212, 198, 0.8), rgba(255, 193, 93, 0.55), rgba(123, 194, 255, 0.35));
  clip-path: polygon(0 22%, 16% 35%, 32% 48%, 49% 58%, 66% 66%, 82% 72%, 100% 76%, 100% 86%, 0 45%);
}

.curve-point {
  position: absolute;
  top: 37px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 6px rgba(123, 194, 255, 0.12);
  transform: translateX(-50%);
}

.curve-point.strong {
  background: var(--teal);
}

.curve-point.warning {
  background: var(--danger);
  box-shadow: 0 0 0 6px rgba(255, 176, 106, 0.14);
}

.curve-point.stable {
  background: var(--warm-soft);
}

.curve-status {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.curve-status article {
  min-height: 86px;
  padding: 14px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
}

.curve-status strong,
.feynman-prompt span {
  display: block;
  margin-bottom: 6px;
  color: var(--warm-soft);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.curve-status span,
.feynman-prompt p {
  color: var(--muted);
  line-height: 1.6;
}

.feynman-lab {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 22px;
  border-radius: 26px;
}

.feynman-prompt h3 {
  margin-bottom: 10px;
  font-size: 1.35rem;
}

.rubric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.rubric-grid span {
  display: flex;
  align-items: center;
  min-height: 54px;
  padding: 12px 14px;
  border-radius: 16px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.rubric-pass {
  box-shadow: inset 3px 0 0 var(--teal);
}

.rubric-warn {
  box-shadow: inset 3px 0 0 var(--danger);
}

.feature-stack {
  display: grid;
  gap: 14px;
}

.stack-card,
.practice-stage {
  border-radius: 26px;
}

.stack-card {
  padding: 18px;
}

.stack-card.active {
  background:
    linear-gradient(150deg, rgba(77, 212, 198, 0.17), rgba(8, 28, 44, 0.94)),
    var(--panel-strong);
}

.stack-step {
  margin-bottom: 8px;
  color: var(--blue);
  font-size: 0.84rem;
  letter-spacing: 0.16em;
}

.stack-card h3 {
  margin-bottom: 8px;
  font-size: 1.2rem;
}

.stack-card p,
.practice-stage p {
  color: var(--muted);
  line-height: 1.7;
}

.practice-stage {
  padding: 24px;
  background:
    radial-gradient(circle at top left, rgba(77, 212, 198, 0.12), transparent 26%),
    linear-gradient(180deg, rgba(8, 32, 49, 0.96), rgba(5, 22, 35, 0.94));
}

.practice-head {
  margin-bottom: 18px;
}

.practice-window {
  display: grid;
  gap: 14px;
}

.bubble,
.coach-note {
  padding: 16px 18px;
  border-radius: 22px;
}

.bubble {
  max-width: 82%;
}

.bubble span,
.coach-note strong {
  display: block;
  margin-bottom: 8px;
}

.bubble.ai {
  background: rgba(255, 255, 255, 0.06);
}

.bubble.user {
  justify-self: end;
  background: linear-gradient(135deg, rgba(255, 143, 63, 0.24), rgba(255, 193, 93, 0.2));
}

.coach-note {
  background: rgba(123, 194, 255, 0.08);
  border: 1px solid rgba(123, 194, 255, 0.16);
}

.mode-pills {
  margin-top: 18px;
}

.mode-pills span {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 980px) {
  .hero-panel,
  .mission-grid,
  .feature-layout,
  .science-panel,
  .feynman-lab {
    grid-template-columns: 1fr;
  }

  .mission-grid {
    gap: 16px;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 20px, 1000px);
    padding-top: 24px;
    padding-bottom: 32px;
  }

  h1 {
    font-size: 2.8rem;
  }

  .signal-strip {
    grid-template-columns: 1fr;
  }

  .curve-axis {
    grid-template-columns: repeat(4, 1fr);
    text-align: left;
  }

  .curve-status,
  .rubric-grid {
    grid-template-columns: 1fr;
  }

  .constellation {
    height: 300px;
  }

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