:root {
  --bg: #0f1720;
  --bg-strong: #0b1118;
  --surface: rgba(18, 28, 38, 0.84);
  --surface-strong: #121d27;
  --line: rgba(184, 204, 218, 0.12);
  --text: #edf3f8;
  --muted: #9fb0bc;
  --teal: #63c6be;
  --blue: #70a3ff;
  --gold: #ffce7c;
  --radius-xl: 28px;
  --radius-lg: 20px;
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.28);
  --font-body: "Instrument Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display: "Fraunces", Georgia, serif;
}

html[data-theme="editorial"] {
  --font-body: "Instrument Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display: "Fraunces", Georgia, serif;
}

html[data-theme="atlas"] {
  --bg: #0e1722;
  --bg-strong: #0b1118;
  --surface: rgba(15, 24, 34, 0.82);
  --surface-strong: #121d27;
  --line: rgba(184, 204, 218, 0.12);
  --text: #edf3f8;
  --muted: #9fb0bc;
  --teal: #7ed0d8;
  --blue: #7f9dff;
  --gold: #f2cc76;
  --font-body: "IBM Plex Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display: "IBM Plex Sans", "PingFang SC", sans-serif;
}

html[data-theme="lab"] {
  --bg: #eff4fb;
  --bg-strong: #e5edf8;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: #ffffff;
  --line: rgba(23, 33, 43, 0.1);
  --text: #17212b;
  --muted: #607080;
  --teal: #2456d3;
  --blue: #2f7b66;
  --gold: #b88323;
  --shadow: 0 18px 34px rgba(44, 78, 126, 0.08);
  --font-body: "IBM Plex Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display: "Fraunces", Georgia, serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(112, 163, 255, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(99, 198, 190, 0.14), transparent 26%),
    linear-gradient(180deg, #101821 0%, var(--bg) 100%);
}

html[data-theme="atlas"] body {
  background:
    radial-gradient(circle at top left, rgba(127, 157, 255, 0.16), transparent 28%),
    radial-gradient(circle at top right, rgba(126, 208, 216, 0.14), transparent 26%),
    linear-gradient(180deg, #101821 0%, var(--bg) 100%);
}

html[data-theme="lab"] body {
  background:
    radial-gradient(circle at top left, rgba(36, 86, 211, 0.12), transparent 28%),
    radial-gradient(circle at top right, rgba(47, 123, 102, 0.1), transparent 26%),
    linear-gradient(180deg, #fafcff 0%, var(--bg) 100%);
}

a {
  color: var(--text);
  text-decoration: none;
}

.page-shell {
  width: min(1280px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0 40px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.8fr);
  gap: 18px;
  margin-bottom: 18px;
}

.hero__content,
.meta-card,
.card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.hero__content {
  padding: clamp(28px, 5vw, 46px);
  border-radius: var(--radius-xl);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4.6rem);
  line-height: 0.94;
  letter-spacing: -0.04em;
}

.subtitle {
  max-width: 50ch;
  margin: 18px 0 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: 1.02rem;
}

.quick-links {
  margin-top: 22px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-toolbar {
  margin-top: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

.quick-links a {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  color: var(--muted);
  font-weight: 600;
}

.quick-links a:hover {
  color: var(--text);
  border-color: rgba(112, 163, 255, 0.3);
}

.theme-switcher {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}

.theme-switcher span {
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.theme-switcher select {
  min-width: 120px;
}

.meta-card {
  border-radius: var(--radius-xl);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 100%;
}

.meta-card__label {
  display: inline-flex;
  margin-bottom: 12px;
  color: var(--gold);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.meta {
  color: var(--muted);
  line-height: 1.8;
}

.controls {
  padding: 20px;
  border-radius: var(--radius-lg);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px) max-content;
  gap: 18px;
  align-items: end;
  margin-bottom: 18px;
}

.controls__group {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.controls label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 600;
}

select {
  width: 100%;
  background: rgba(9, 15, 22, 0.9);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  padding: 11px 13px;
  font: inherit;
}

.topics-field select {
  min-height: 190px;
}

button {
  min-height: 48px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--blue), #4f8fff);
  color: white;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 14px 28px rgba(79, 143, 255, 0.2);
}

button:hover {
  filter: brightness(1.06);
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 1100px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  border-radius: var(--radius-lg);
  padding: 18px;
}

.card__header {
  margin-bottom: 12px;
}

.card__header h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: -0.02em;
}

.card__header p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.chart-card canvas {
  width: 100% !important;
  min-height: 300px;
}

@media (max-width: 980px) {
  .hero,
  .controls,
  .controls__group {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100vw - 18px, 1280px);
    padding-top: 10px;
    padding-bottom: 18px;
  }

  .hero__content,
  .meta-card,
  .card {
    border-radius: 22px;
  }

  .quick-links {
    flex-direction: column;
  }

  .hero-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .theme-switcher {
    justify-content: space-between;
  }

  .quick-links a,
  button {
    width: 100%;
    justify-content: center;
    text-align: center;
  }
}