/* =========================================================
   WeatherSim — ECCV 2026 project page
   Self-contained, dependency-free stylesheet
   ========================================================= */

:root {
  --bg:          #f5f8fd;
  --bg-soft:     #eef3fb;
  --panel:       #ffffff;
  --panel-2:     #f3f7fd;
  --border:      rgba(20, 33, 61, 0.10);
  --text:        #16213a;
  --text-soft:   #4a5670;
  --text-dim:    #8893a8;
  --accent:      #2f6df0;   /* sky blue  — snow / semantics   */
  --accent-2:    #d8a32a;   /* gold      — physics / dynamics  */
  --accent-3:    #c8743a;   /* warm orange — desert / geometry */
  --snow:        #6f8fc4;
  --radius:      18px;
  --maxw:        1080px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--accent-3); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ----------------------------------------------------------
   Animated atmospheric background
   ---------------------------------------------------------- */
.bg-aurora {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(60% 50% at 18% 0%,  rgba(47,109,240,.12), transparent 60%),
    radial-gradient(55% 45% at 85% 8%,  rgba(216,163,42,.10), transparent 60%),
    radial-gradient(70% 60% at 50% 100%, rgba(200,116,58,.07), transparent 60%),
    var(--bg);
}
#snow-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* ----------------------------------------------------------
   Hero
   ---------------------------------------------------------- */
.hero { padding: 92px 0 40px; text-align: center; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--accent-3);
  background: rgba(200,116,58,.10);
  border: 1px solid rgba(200,116,58,.28);
  padding: 7px 16px;
  border-radius: 999px;
  margin-bottom: 26px;
}
.badge .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent-3);
  box-shadow: 0 0 10px var(--accent-3);
}

.hero h1 {
  font-size: clamp(1.15rem, 2.55vw, 2.0rem);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -.02em;
  margin: 0 auto 22px;
  max-width: none;
  background: linear-gradient(115deg, #16213a 8%, var(--accent) 58%, var(--accent-2) 96%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero h1 .line1 { white-space: nowrap; }
.hero h1 .em { white-space: nowrap; }

/* authors */
.authors {
  font-size: 1.06rem;
  color: var(--text);
  max-width: 1000px;
  margin: 0 auto 14px;
}
.authors a { color: var(--text); font-weight: 600; white-space: nowrap; }
.authors a:hover { color: var(--accent-3); }
.authors sup { color: var(--accent); font-weight: 600; font-size: .72em; }
.corr { color: var(--accent-3); }

.affil {
  font-size: .92rem;
  color: var(--text-soft);
  max-width: 900px;
  margin: 0 auto 8px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  row-gap: 4px;
}
.affil .aff { white-space: nowrap; }
.affil .aff:not(:last-child)::after {
  content: "·";
  margin: 0 12px;
  color: var(--text-dim);
}
.affil sup { color: var(--accent); font-weight: 600; }
.corr-note { font-size: .85rem; color: var(--text-dim); margin-bottom: 30px; }

/* buttons */
.btn-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 13px;
  margin-top: 8px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .96rem;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  transition: transform .18s ease, border-color .2s ease, background .2s ease, box-shadow .2s ease;
}
.btn:hover {
  transform: translateY(-2px);
  border-color: rgba(47,109,240,.5);
  background: var(--panel-2);
  color: #fff;
  box-shadow: 0 10px 30px -12px rgba(47,109,240,.5);
}
.btn.primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  border-color: transparent;
  color: #0b0f1a;
}
.btn.primary:hover { color: #0b0f1a; box-shadow: 0 14px 34px -10px rgba(47,109,240,.65); }
.btn svg { width: 18px; height: 18px; }
.btn.disabled {
  opacity: .55;
  cursor: default;
  color: var(--text-soft);
}
.btn.disabled:hover { transform: none; border-color: var(--border); background: var(--panel); color: var(--text-soft); box-shadow: none; }
.btn .soon {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 999px;
  background: rgba(20,33,61,.08);
  color: var(--text-dim);
}

/* ----------------------------------------------------------
   Sections
   ---------------------------------------------------------- */
section { padding: 56px 0; }
.section-tag {
  display: block;
  text-align: center;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.section-title {
  text-align: center;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -.02em;
  margin: 0 0 14px;
}
.section-sub {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 36px;
  color: var(--text-soft);
}

.figure {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
  box-shadow: 0 22px 50px -28px rgba(20,33,61,.28);
}
.figure img { display: block; width: 100%; height: auto; }
.figure video { display: block; width: 100%; height: auto; background: #000; }
.figcaption {
  font-size: .9rem;
  color: var(--text-soft);
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
}
.figcaption b { color: var(--text); }

/* teaser pulled up under hero */
.teaser-wrap { margin-top: 8px; }

/* abstract */
.abstract-card {
  background: linear-gradient(180deg, var(--panel), var(--bg-soft));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 40px;
  max-width: 900px;
  margin: 0 auto;
}
.abstract-card p { color: var(--text-soft); margin: 0 0 16px; }
.abstract-card p:last-child { margin-bottom: 0; }
.abstract-card .lead { color: var(--text); }
.kw {
  color: var(--accent-3);
  font-weight: 600;
}
.kw-sem { color: var(--accent); }
.kw-dyn { color: #9a6f12; }
.kw-geo { color: #b35e23; }

.tagline {
  text-align: center;
  margin: 34px auto 0;
  max-width: 760px;
  font-size: clamp(1.25rem, 2.4vw, 1.85rem);
  font-weight: 700;
  font-style: italic;
  letter-spacing: -.01em;
  background: linear-gradient(115deg, var(--accent) 8%, var(--accent-3) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* video */
.video-frame {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
  box-shadow: 0 26px 60px -30px rgba(20,33,61,.32);
  max-width: 960px;
  margin: 0 auto;
}
.video-frame video { display: block; width: 100%; height: auto; }

/* three pillars */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}
.pillar {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: transform .2s ease, border-color .2s ease;
}
.pillar:hover { transform: translateY(-4px); border-color: rgba(47,109,240,.35); }
.pillar .icon {
  width: 46px; height: 46px;
  display: grid; place-items: center;
  border-radius: 12px;
  margin-bottom: 16px;
  font-size: 1.4rem;
}
.pillar:nth-child(1) .icon { background: rgba(47,109,240,.14); }
.pillar:nth-child(2) .icon { background: rgba(216,163,42,.18); }
.pillar:nth-child(3) .icon { background: rgba(200,116,58,.16); }
.pillar:nth-child(1) .tag { color: var(--accent); }
.pillar:nth-child(2) .tag { color: #9a6f12; }
.pillar:nth-child(3) .tag { color: #b35e23; }
.pillar h3 { margin: 0 0 8px; font-size: 1.12rem; }
.pillar .tag {
  font-size: .76rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent); display:block; margin-bottom: 4px;
}
.pillar p { margin: 0; color: var(--text-soft); font-size: .93rem; }

.method-stack { display: grid; gap: 26px; }

/* results / stat */
.stat-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-bottom: 40px;
}
.stat {
  flex: 1 1 220px;
  max-width: 280px;
  text-align: center;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 22px;
}
.stat .num {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -.02em;
  background: linear-gradient(120deg, var(--accent-3), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat .lbl { color: var(--text-soft); font-size: .92rem; margin-top: 4px; }

/* bibtex */
.bibtex {
  background: #0e1830;
  border: 1px solid rgba(20,33,61,.18);
  border-radius: var(--radius);
  padding: 4px 0;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  box-shadow: 0 22px 50px -30px rgba(20,33,61,.4);
}
.bibtex pre {
  margin: 0;
  padding: 24px 26px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: .86rem;
  line-height: 1.7;
  color: #c7d4ee;
}
.bibtex .copy {
  position: absolute;
  top: 14px; right: 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text-soft);
  font-size: .8rem;
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: all .2s ease;
}
.bibtex .copy:hover { color: #fff; border-color: var(--accent); }

/* footer */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 0 60px;
  text-align: center;
  color: var(--text-dim);
  font-size: .88rem;
}
footer a { color: var(--text-soft); }
.ack {
  max-width: 760px; margin: 0 auto 18px;
  color: var(--text-dim); font-size: .82rem; line-height: 1.6;
}

/* responsive */
@media (max-width: 760px) {
  .pillars { grid-template-columns: 1fr; }
  .abstract-card { padding: 28px 22px; }
  .hero { padding: 64px 0 28px; }
  .hero h1 .line1 { white-space: normal; }
  .affil .aff { white-space: normal; }
}