/* =====================================================================
   Project website — two-temperature aesthetic.
   Dark immersive hero flowing into a warm-beige article body.
   Inspired by https://pub.sakana.ai/digital-ecosystem/
   ===================================================================== */

@property --button-angle {
  syntax: '<angle>';
  initial-value: 0deg;
  inherits: false;
}

:root {
  --content-width: 920px;
  --content-pad: 28px;

  /* Article (warm zone) — default */
  --color-bg: #FAF7F2;
  --color-bg-soft: #F2EDE4;
  --color-bg-card: #F0EBE1;
  --color-text: #1B1B1A;
  --color-text-muted: #5A5A55;
  --color-text-faint: #8A8A86;
  --color-rule: #DDD5C8;
  --color-accent: #2D8F6F;
  --color-accent-hover: #1E6B50;
  --color-accent-faint: #E6F5EF;
  --color-link: #1E5F7A;

  /* Palette echoed from vis_utils/common.py DATASET_COLORS */
  --color-etth1: #1f77b4;
  --color-etth2: #ff7f0e;
  --color-ettm1: #2ca02c;
  --color-ettm2: #d62728;
  --color-weather: #9467bd;
  --color-electricity: #8c564b;
  --color-traffic: #e377c2;
  --color-exchange: #7f7f7f;

  --font-display: "DM Serif Display", "Source Serif 4", Charter, Georgia, serif;
  --font-serif:   "Source Serif 4", "Source Serif Pro", Charter, "Iowan Old Style",
                  "Cambria", Georgia, serif;
  --font-sans:    "DM Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI",
                  Helvetica, "Helvetica Neue", Arial, sans-serif;
  --font-mono:    "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  hanging-punctuation: first last;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 32px;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.66;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: rgba(45, 143, 111, 0.22);
  color: var(--color-text);
  text-shadow: none;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* --- layout container ---------------------------------------------- */
.page,
section,
.hero-wrap,
footer { width: 100%; }

.col {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--content-pad);
}

section[id] { scroll-margin-top: 32px; }

/* =====================================================================
   HERO — dark immersive, full-bleed
   ===================================================================== */

.hero {
  /* scoped dark tokens — descendants automatically pick these up */
  --color-bg: #0A1218;
  --color-bg-soft: #0E1A22;
  --color-bg-card: #131D26;
  --color-text: #F2EFE6;
  --color-text-muted: #9CA3AD;
  --color-text-faint: #6B7280;
  --color-rule: rgba(255, 255, 255, 0.10);

  position: relative;
  padding: 88px 0 72px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 25% 30%, #122230 0%, #0A1218 55%, #060A0E 100%);
  color: var(--color-text);
  isolation: isolate;
}

/* Ambient drift behind the content */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 38%, rgba(45, 143, 111, 0.10) 0%, transparent 50%),
    radial-gradient(circle at 78% 62%, rgba(98, 128, 178, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 52% 88%, rgba(200, 148, 62, 0.05) 0%, transparent 45%);
  animation: ambientShift 22s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: -1;
}

@keyframes ambientShift {
  0%   { opacity: 0.55; transform: scale(1.00); }
  50%  { opacity: 1.00; transform: scale(1.10); }
  100% { opacity: 0.65; transform: scale(1.05); }
}

.hero .col { position: relative; z-index: 1; }

.hero h1 {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: -0.018em;
  margin: 0 0 18px;
  color: #FFFFFF;
  text-wrap: balance;
}

.hero .subtitle {
  font-family: var(--font-sans);
  color: rgba(212, 235, 224, 0.78);
  font-size: 18px;
  font-weight: 400;
  margin: 0 0 28px;
  letter-spacing: 0.005em;
  max-width: 62ch;
}

.hero .authors {
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: rgba(255, 255, 255, 0.82);
  margin: 0 0 6px;
}

.hero .authors sup {
  color: rgba(255, 255, 255, 0.55);
  font-weight: 400;
  font-size: 0.7em;
}

.hero .authors .affil {
  color: rgba(255, 255, 255, 0.42);
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.82em;
}

.hero .affiliations {
  font-family: var(--font-sans);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  margin: 0 0 32px;
  line-height: 1.55;
}

.hero .affiliations sup {
  color: rgba(255, 255, 255, 0.40);
  font-size: 0.78em;
}

.hero .affiliations a {
  color: rgba(155, 230, 200, 0.90);
  font-family: var(--font-mono);
  font-size: 0.92em;
  text-decoration: none;
  border-bottom: 1px dotted rgba(155, 230, 200, 0.4);
}

.hero .affiliations a:hover {
  color: #BCF1D9;
  border-bottom-color: rgba(155, 230, 200, 0.75);
}

.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

/* --- buttons (article + hero) ------------------------------------- */

.cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid var(--color-rule);
  background: transparent;
  color: var(--color-text);
  transition: background 0.16s ease, border-color 0.16s ease,
              color 0.16s ease, transform 0.06s ease;
}

.cta:hover { border-color: var(--color-accent); color: var(--color-accent); }
.cta:active { transform: translateY(1px); }

.cta.primary {
  background: var(--color-accent);
  color: #FFFFFF;
  border-color: var(--color-accent);
}
.cta.primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #FFFFFF;
}

/* Ghost CTA — hero secondary actions (dark zone) */
.hero .cta.ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.88);
}
.hero .cta.ghost:hover {
  border-color: rgba(45, 220, 160, 0.55);
  color: #B9F1DA;
}

/* --- glowing CTA (rotating conic gradient + pulse) ---------------- */

.cta.primary--glow {
  position: relative;
  padding: 0;
  border: none;
  border-radius: 13px;
  background: conic-gradient(
    from var(--button-angle, 0deg),
    #2DDFAE, #6BAEFF, #C8A547, #2DDFAE
  );
  cursor: pointer;
  z-index: 1;
  animation:
    rotateBorderGradient 5s linear infinite,
    glowPulse 3.2s ease-in-out infinite;
  transition: transform 0.2s ease, box-shadow 0.3s ease;
}

.cta.primary--glow::before {
  content: '';
  position: absolute;
  inset: -18px;
  border-radius: 22px;
  background: conic-gradient(
    from var(--button-angle, 0deg),
    rgba(45, 223, 174, 0.32),
    rgba(107, 174, 255, 0.22),
    rgba(200, 165, 71, 0.22),
    rgba(45, 223, 174, 0.32)
  );
  filter: blur(22px);
  z-index: -1;
  animation: rotateBorderGradient 5s linear infinite;
  pointer-events: none;
}

.cta.primary--glow .cta-inner {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 11px;
  background: linear-gradient(135deg, #0E2032 0%, #122B3E 100%);
  color: #FFFFFF;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.cta.primary--glow:hover { transform: scale(1.025); }
.cta.primary--glow:hover .cta-inner {
  background: linear-gradient(135deg, #122B3E 0%, #16374F 100%);
}
.cta.primary--glow:active { transform: scale(0.98); }

@keyframes rotateBorderGradient { to { --button-angle: 360deg; } }

@keyframes glowPulse {
  0%, 100% {
    box-shadow:
      0 0 18px rgba(45, 223, 174, 0.25),
      0 0 60px rgba(45, 223, 174, 0.10);
  }
  50% {
    box-shadow:
      0 0 28px rgba(45, 223, 174, 0.40),
      0 0 80px rgba(45, 223, 174, 0.16),
      0 0 120px rgba(107, 174, 255, 0.10);
  }
}

/* Firefox / older browsers without @property support */
@supports not (background: conic-gradient(from 0deg, red, blue)) {
  .cta.primary--glow {
    background: linear-gradient(135deg, #2DDFAE, #6BAEFF, #C8A547);
    animation: glowPulse 3.2s ease-in-out infinite;
  }
  .cta.primary--glow::before { animation: none; }
}

/* Respect motion preferences */
@media (prefers-reduced-motion: reduce) {
  .hero::before { animation: none; opacity: 0.7; }
  .cta.primary--glow { animation: glowPulse 3.2s ease-in-out infinite; }
  .cta.primary--glow::before { animation: none; }
}

/* --- hero image / widget panel ------------------------------------ */

.hero-image { margin-top: 52px; }

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}

.hero-image figcaption {
  font-family: var(--font-sans);
  font-size: 13.5px;
  color: rgba(242, 239, 230, 0.62);
  line-height: 1.6;
  margin-top: 16px;
}

/* The hero widget renders on a light inset "screen" against the dark hero */
.hero .la-widget.hero {
  background: #F7F4EE;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 16px 16px 12px;
  color: #1B1B1A;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.04) inset,
    0 14px 50px rgba(0, 0, 0, 0.35),
    0 2px 8px rgba(0, 0, 0, 0.20);
}

.hero .la-widget.hero .la-chip {
  background: #FFFFFF;
  border-color: #DDD5C8;
  color: #5A5A55;
}
.hero .la-widget.hero .la-chip:hover { border-color: #8A8A86; color: #1B1B1A; }
.hero .la-widget.hero .la-chip.active { color: #FFFFFF; }

.hero .la-widget.hero .la-plot { background: #FFFFFF; }

.hero .la-widget.hero .la-play {
  background: #FFFFFF;
  border-color: #DDD5C8;
  color: #1B1B1A;
}
.hero .la-widget.hero .la-play:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.hero .la-widget.hero .la-slider { background: #D6D2C5; }
.hero .la-widget.hero .la-readout { color: #1B1B1A; }

/* =====================================================================
   ARTICLE — warm beige body
   ===================================================================== */

section { padding: 48px 0; }

section + section { border-top: 1px solid var(--color-rule); }

.section-eyebrow {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 14px;
}

section h2 {
  font-family: var(--font-display);
  font-size: 38px;
  font-weight: 400;
  letter-spacing: -0.012em;
  margin: 0 0 24px;
  line-height: 1.12;
  text-wrap: balance;
}

section h3 {
  font-family: var(--font-sans);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin: 36px 0 12px;
  line-height: 1.32;
}

p { margin: 0 0 18px; }

a { color: var(--color-link); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--color-accent); }

code, kbd, .mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* --- tl;dr --------------------------------------------------------- */
.tldr ol { padding-left: 24px; margin: 0 0 24px; }
.tldr ol li { margin-bottom: 12px; }
.tldr ol li::marker {
  color: var(--color-accent);
  font-weight: 700;
  font-family: var(--font-sans);
}

/* --- result subsections -------------------------------------------- */
.result-card { margin: 28px 0 32px; }
.result-card figure { margin: 0 0 14px; }
.result-card figure img {
  width: 100%;
  height: auto;
  display: block;
  background: var(--color-bg-soft);
  border-radius: 6px;
}
.result-card figcaption {
  font-family: var(--font-sans);
  font-size: 13.5px;
  color: var(--color-text-muted);
  margin-top: 12px;
  line-height: 1.55;
}

/* --- demo / playground CTA card ------------------------------------ */
.demo-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-rule);
  border-radius: 12px;
  margin: 18px 0 0;
}
.demo-card .placeholder {
  width: 100%;
  aspect-ratio: 16 / 9;
  background:
    repeating-linear-gradient(45deg, #E7E0D2, #E7E0D2 16px, #EDE7D9 16px, #EDE7D9 32px);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 22px;
}
.demo-card .demo-preview {
  width: 100%;
  aspect-ratio: 1440 / 900;
  border-radius: 8px;
  margin-bottom: 22px;
  display: block;
  border: 1px solid var(--color-rule);
}
.demo-card .cta.primary { font-size: 16px; padding: 12px 22px; }

/* --- table --------------------------------------------------------- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-variant-numeric: tabular-nums lining-nums;
}
th, td {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 1px solid var(--color-rule);
}
th {
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-bg-soft);
}
td.num { text-align: right; font-variant-numeric: tabular-nums; }

/* --- citation block ------------------------------------------------ */
pre.bibtex {
  background: #1A1F26;
  color: #E9E5D3;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  padding: 18px 22px;
  border-radius: 8px;
  overflow-x: auto;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.copy-btn {
  position: absolute;
  top: 12px; right: 12px;
  padding: 6px 12px;
  font-family: var(--font-sans);
  font-size: 12px;
  background: #2E3641;
  color: #E9E5D3;
  border: 1px solid #444A57;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.16s ease;
}
.copy-btn:hover { background: #3A4554; }

/* --- Lookback-span widget (article zone) --------------------------- */
.la-widget {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-rule);
  border-radius: 10px;
  padding: 20px 20px 16px;
  margin: 24px 0 14px;
}

.la-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.la-chip {
  font-family: var(--font-sans);
  font-size: 13px;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1.5px solid var(--color-rule);
  background: #FFFFFF;
  color: var(--color-text-muted);
  cursor: pointer;
  user-select: none;
  transition: border-color 0.14s ease, color 0.14s ease;
}
.la-chip:hover { border-color: var(--color-text-faint); color: var(--color-text); }
.la-chip.active {
  background: var(--chip-color, var(--color-accent));
  border-color: var(--chip-color, var(--color-accent));
  color: white;
}

.la-plot { width: 100%; display: block; background: white; border-radius: 4px; }

.la-controls {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-top: 12px;
  font-family: var(--font-sans);
  font-size: 13.5px;
}
.la-play {
  font-family: var(--font-sans);
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--color-rule);
  background: white;
  cursor: pointer;
  color: var(--color-text);
}
.la-play:hover { border-color: var(--color-accent); color: var(--color-accent); }

.la-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 8px;
  border-radius: 999px;
  background: #D6D2C5;
  outline: none;
}
.la-slider::-webkit-slider-runnable-track { height: 8px; border-radius: 999px; background: transparent; }
.la-slider::-moz-range-track { height: 8px; border-radius: 999px; background: transparent; }
.la-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  margin-top: -4px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer; border: 2px solid white;
  box-shadow: 0 0 0 1px var(--color-accent-hover);
}
.la-slider::-moz-range-thumb {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer; border: 2px solid white;
}
.la-readout {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text);
  min-width: 80px;
  text-align: right;
}

/* --- main results table (lifted from paper) ----------------------- */
.results-scroll { overflow-x: auto; width: 100%; }
table.main-results {
  border-collapse: collapse;
  width: 100%;
  margin: 10px 0 22px;
  font-family: var(--font-sans);
  font-size: 13px;
  min-width: 760px;
}
table.main-results thead th {
  background: var(--color-bg-soft);
  color: var(--color-text-muted);
  font-weight: 600;
  text-align: center;
  padding: 7px 8px;
  border-bottom: 1px solid var(--color-rule);
  white-space: nowrap;
}
table.main-results thead th.group {
  background: var(--color-bg-card);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.06em;
}
table.main-results thead th.group-linear { color: var(--color-accent); }
table.main-results thead th.group-nonlinear { color: #8E5A1F; }
table.main-results td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--color-rule);
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  font-size: 12.5px;
}
table.main-results td.ds-cell {
  font-family: var(--font-sans);
  font-weight: 600;
  vertical-align: middle;
  text-align: left;
  background: var(--color-bg-soft);
  border-right: 1px solid var(--color-rule);
}
table.main-results td.h-cell {
  font-family: var(--font-sans);
  color: var(--color-text-muted);
  text-align: center;
  background: var(--color-bg-soft);
  border-right: 1px solid var(--color-rule);
}
table.main-results td.best {
  background: var(--color-accent-faint);
  font-weight: 700;
  color: #155947;
}
table.main-results td.second {
  background: #F1EFE3;
  text-decoration: underline;
}
table.main-results td.ours {
  border-left: 2px solid rgba(45, 143, 111, 0.18);
}
table.main-results tr.avg-row td {
  font-style: italic;
  background: #FBF9F3;
}
table.main-results tr.avg-row td.best { background: #D7EEE3; }
table.main-results tr.avg-row td.second { background: #E9E5D3; }
table.main-results tr.avg-row { border-bottom: 2px solid var(--color-rule); }

.row-key.second {
  text-decoration: underline;
  background: #F1EFE3;
  padding: 0 4px;
  border-radius: 2px;
}

/* --- benchmark table ---------------------------------------------- */
table.bench-table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 20px;
  font-family: var(--font-sans);
  font-size: 13px;
}
table.bench-table th,
table.bench-table td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--color-rule);
}
table.bench-table thead th {
  background: var(--color-bg-soft);
  color: var(--color-text-muted);
  font-weight: 600;
  text-align: left;
  font-size: 12px;
}
table.bench-table td.ds-cell {
  font-weight: 600;
  vertical-align: middle;
  border-right: 1px solid var(--color-rule);
}
table.bench-table td.scope-cell { color: var(--color-text-muted); }
table.bench-table td.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  font-size: 12.5px;
}
table.bench-table td.num.best { font-weight: 600; color: var(--color-accent); }
table.bench-table tr:nth-child(3n) td { border-bottom: 2px solid var(--color-rule); }

/* --- native (Plotly) figure containers ---------------------------- */
.native-plot {
  width: 100%;
  min-height: 320px;
  background: white;
  border: 1px solid var(--color-rule);
  border-radius: 6px;
  overflow: hidden;
}
.hp-heatmap-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.hp-heatmap-row .native-plot {
  min-height: 280px;
  border: 1px solid var(--color-rule);
}

@media (max-width: 720px) {
  .hp-heatmap-row { grid-template-columns: 1fr; }
}

/* --- footer ------------------------------------------------------- */
footer {
  background: var(--color-bg-soft);
  padding: 36px 0;
  margin-top: 40px;
  border-top: 1px solid var(--color-rule);
}
footer .col {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-sans);
  font-size: 13.5px;
  color: var(--color-text-muted);
}

/* --- responsive --------------------------------------------------- */
@media (max-width: 720px) {
  body { font-size: 16.5px; }
  .hero { padding: 64px 0 48px; min-height: 88vh; }
  .hero h1 { font-size: 38px; }
  .hero .subtitle { font-size: 16px; }
  section { padding: 48px 0; }
  section + section::before { margin-bottom: 36px; }
  section h2 { font-size: 28px; }
  section h3 { font-size: 17px; }
  .widget-a__controls { grid-template-columns: 1fr; }
}