:root {
  --bg: #0b1020;
  --bg2: #0f1733;
  --card: #111a3a;
  --text: #eaf0ff;
  --muted: #b7c3ff;
  --muted2: #93a6ff;
  --line: rgba(234, 240, 255, .12);
  --line2: rgba(234, 240, 255, .18);
  --accent: #7c5cff;
  --accent2: #25d3ff;
  --good: #27d67b;
  --warn: #ffcc66;
  --bad: #ff5c7a;

  --shadow: 0 18px 40px rgba(0, 0, 0, .35);
  --radius: 18px;
  --radius2: 14px;

  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

[data-theme="light"] {
  --bg: #f7f8ff;
  --bg2: #eef1ff;
  --card: #ffffff;
  --text: #0a1024;
  --muted: #3a4a86;
  --muted2: #5a6bb0;
  --line: rgba(10, 16, 36, .12);
  --line2: rgba(10, 16, 36, .18);
  --shadow: 0 18px 40px rgba(8, 12, 28, .10);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: radial-gradient(1200px 900px at 20% 0%, rgba(124, 92, 255, .25), transparent 60%),
    radial-gradient(1100px 900px at 90% 10%, rgba(37, 211, 255, .18), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-decoration-color: rgba(124, 92, 255, .6);
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 99;
  backdrop-filter: blur(10px);
  background: linear-gradient(180deg, rgba(10, 16, 36, .72), rgba(10, 16, 36, .30));
  border-bottom: 1px solid var(--line);
}

[data-theme="light"] .nav {
  background: linear-gradient(180deg, rgba(247, 248, 255, .85), rgba(247, 248, 255, .55));
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 180px;
  max-width: 320px;
  flex: 0 0 auto;
}

.logo {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 12px 24px rgba(124, 92, 255, .25);
}

.brand-title {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-title strong {
  font-weight: 800;
  letter-spacing: .2px;
}

.brand-title span {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 250px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: nowrap;
  justify-content: flex-end;
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

.nav-links a {
  font-size: 13px;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid transparent;
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--text);
  border-color: var(--line);
  background: rgba(255, 255, 255, .04);
  text-decoration: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--line2);
  background: rgba(255, 255, 255, .04);
  color: var(--text);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  user-select: none;
}

.btn:hover {
  background: rgba(255, 255, 255, .07);
}

.btn.primary {
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #081024;
}

.btn.primary:hover {
  filter: brightness(1.03);
}

.btn.ghost {
  background: transparent;
}

.btn.disabled,
.btn[aria-disabled="true"] {
  opacity: .55;
  cursor: not-allowed;
  pointer-events: none;
}

.hero {
  padding: 44px 0 22px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.18fr .82fr;
  gap: 18px;
  align-items: stretch;
}

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

  .brand {
    min-width: unset;
  }
}

.card {
  background: linear-gradient(180deg, rgba(255, 255, 255, .06), rgba(255, 255, 255, .02));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

[data-theme="light"] .card {
  background: var(--card);
}

.hero-main {
  padding: 22px 22px 18px;
  position: relative;
  overflow: hidden;
}

.hero-main::before {
  content: "";
  position: absolute;
  inset: -160px -80px auto auto;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle at 30% 30%, rgba(124, 92, 255, .35), transparent 55%),
    radial-gradient(circle at 70% 70%, rgba(37, 211, 255, .22), transparent 55%);
  transform: rotate(18deg);
  filter: blur(6px);
}

.h-title {
  position: relative;
  z-index: 1;
  margin: 0 0 8px;
  font-size: 36px;
  letter-spacing: .2px;
  font-weight: 900;
}

.h-sub {
  position: relative;
  z-index: 1;
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.55;
  font-size: 14.5px;
}

.badges {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.badge {
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .04);
  font-size: 12px;
  color: var(--muted);
}

.badge strong {
  color: var(--text);
  font-weight: 800;
}

.hero-side {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.side-block {
  padding: 14px 14px 12px;
  border-radius: var(--radius2);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .03);
}

.side-block h3 {
  margin: 0 0 10px;
  font-size: 14px;
  letter-spacing: .2px;
}

.kv {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 8px 12px;
  font-size: 13px;
  align-items: start;
}

.kv .k {
  color: var(--muted2);
}

.kv .v {
  color: var(--text);
}

.kv a {
  text-decoration: underline;
  text-decoration-color: rgba(124, 92, 255, .45);
}

.section {
  padding: 18px 0;
}

.section h2 {
  margin: 0 0 10px;
  font-size: 20px;
  letter-spacing: .2px;
}

.section p {
  margin: 0 0 10px;
  color: var(--muted);
  line-height: 1.65;
  font-size: 14.5px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 900px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

.media {
  padding: 14px;
}

.media .cap {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.media img {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .03);
}

.media video {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .03);
}

.placeholder {
  border-radius: 14px;
  border: 1px dashed var(--line2);
  padding: 14px;
  color: var(--muted);
  background: rgba(255, 255, 255, .02);
  font-size: 13px;
  line-height: 1.55;
}

.table-wrap {
  overflow: auto;
  border-radius: 16px;
  border: 1px solid var(--line);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
  background: rgba(255, 255, 255, .02);
}

th,
td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  font-size: 13px;
}

th {
  text-align: left;
  color: var(--muted2);
  font-weight: 800;
  letter-spacing: .15px;
  background: rgba(255, 255, 255, .03);
}

tr:last-child td {
  border-bottom: none;
}

td strong {
  font-weight: 900;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .03);
  font-size: 12px;
  color: var(--muted);
}

.pill.good {
  color: var(--good);
  border-color: rgba(39, 214, 123, .35);
}

.pill.warn {
  color: var(--warn);
  border-color: rgba(255, 204, 102, .35);
}

.pill.bad {
  color: var(--bad);
  border-color: rgba(255, 92, 122, .35);
}

.code {
  background: rgba(0, 0, 0, .22);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: #eaf0ff;
}

[data-theme="light"] .code {
  background: rgba(10, 16, 36, .06);
  color: var(--text);
}

.codebar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin: 12px 0 8px;
}

.codebar .label {
  color: var(--muted2);
  font-size: 13px;
  font-weight: 800;
}

.copybtn {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 800;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid var(--line2);
  background: rgba(255, 255, 255, .03);
  color: var(--text);
  cursor: pointer;
}

.copybtn:hover {
  background: rgba(255, 255, 255, .06);
}

.footer {
  margin-top: 14px;
  padding: 18px 0 32px;
  color: var(--muted);
  font-size: 13px;
}

.footer .fine {
  margin-top: 8px;
  opacity: .9;
  line-height: 1.6;
}

hr.sep {
  border: none;
  height: 1px;
  background: var(--line);
  margin: 14px 0;
}

.small {
  font-size: 13px;
  color: var(--muted);
}

kbd {
  font-family: var(--mono);
  font-size: 12px;
  padding: 2px 7px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .03);
}

.notice {
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .03);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.notice strong {
  color: var(--text);
}

.viz-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.viz-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.viz-inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

.viz-inline select,
.viz-inline input[type="range"] {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .02);
  color: var(--text);
  border-radius: 8px;
}

.viz-inline select {
  padding: 5px 7px;
}

.viz-inline input[type="range"] {
  accent-color: color-mix(in srgb, var(--accent) 65%, #808080 35%);
  opacity: .82;
  margin: 0;
  padding: 0;
}

.viz-inline input[type="range"]:hover {
  opacity: .95;
}

#syncSeek {
  accent-color: #ff4d4f;
  margin-left: -6px;
  width: calc(100% + 6px);
}

.viz-inline input[type="checkbox"] {
  width: 16px;
  height: 16px;
}

.viz-grow {
  flex: 1;
}

.viz-grow input[type="range"] {
  flex: 1;
  min-width: 220px;
}

.viz-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.viz-canvas-wrap {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, .02);
  padding: 8px;
}

#surprisalCanvas {
  width: 100%;
  height: 320px;
  display: block;
}

.anchor {
  scroll-margin-top: 74px;
}

/* ===== 2026-03-11: Helios-like top hero refresh ===== */

.anchor {
  scroll-margin-top: 86px;
}

.hero {
  padding: 52px 0 18px;
}

.paper-hero {
  max-width: 1040px;
  margin: 0 auto;
  text-align: center;
}

.paper-title {
  margin: 0;
  font-size: clamp(42px, 6.4vw, 72px);
  line-height: 1.05;
  letter-spacing: -.04em;
  font-weight: 900;
  text-wrap: balance;
}

.paper-authors {
  margin: 24px 0 10px;
  font-size: clamp(18px, 2.15vw, 28px);
  line-height: 1.45;
  color: var(--text);
}

.paper-authors strong {
  font-weight: 850;
}

.paper-authors sup,
.paper-affiliations sup,
.paper-notes sup {
  font-size: .62em;
  vertical-align: super;
}

.paper-affiliations {
  margin: 0;
  font-size: clamp(17px, 1.7vw, 25px);
  line-height: 1.5;
  color: var(--text);
}

.paper-affiliations span {
  display: inline-block;
}

.paper-notes {
  margin: 10px auto 0;
  max-width: 980px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 18px 24px;
  flex-wrap: wrap;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.paper-notes a {
  text-decoration: underline;
  text-decoration-color: rgba(124, 92, 255, .45);
}

.hero-links {
  margin-top: 26px;
  display: flex;
  justify-content: center;
  gap: 14px 14px;
  flex-wrap: wrap;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, .9);
  background: rgba(255, 255, 255, .90);
  color: #07101f;
  font-size: 16px;
  font-weight: 800;
  line-height: 1;
  box-shadow: 0 10px 22px rgba(0, 0, 0, .18);
  transition: transform .15s ease, box-shadow .15s ease, opacity .15s ease;
}

.hero-link:hover {
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 14px 28px rgba(0, 0, 0, .24);
}

.paper-quote {
  margin: 34px 0 0;
  font-size: clamp(20px, 2vw, 30px);
  line-height: 1.45;
  font-weight: 700;
  color: var(--text);
}

.paper-quote em {
  font-style: italic;
}

.paper-concept {
  margin-top: 24px;
  padding: 0;
  overflow: hidden;
}

.paper-concept img {
  display: block;
  width: 100%;
  border: none;
  border-radius: 0;
  background: transparent;
}

.section h2 {
  position: relative;
  z-index: 0;
  display: inline-block;
  margin: 0 0 14px;
  padding: 9px 16px 10px;
  font-size: clamp(22px, 2.2vw, 34px);
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.1;
  background: linear-gradient(90deg, #74a7ff 0%, #a58cff 48%, #ffc38a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section h2::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .04);
  z-index: -1;
}

[data-theme="light"] .section h2::after {
  background: rgba(10, 16, 36, .04);
}

[data-theme="light"] .hero-link {
  border-color: rgba(10, 16, 36, .18);
  background: #0a1024;
  color: #f7f8ff;
  box-shadow: 0 10px 22px rgba(8, 12, 28, .12);
}

@media (max-width: 900px) {
  .paper-title {
    letter-spacing: -.02em;
  }

  .paper-authors {
    font-size: 18px;
  }

  .paper-affiliations {
    font-size: 17px;
  }

  .paper-notes {
    flex-direction: column;
    gap: 8px;
  }

  .hero-link {
    width: 100%;
    max-width: 320px;
  }
}