assets/paper.css

/* Code4Scene project page. The layout and tokens follow the SimWorld Studio project page (simworld.org/simworld-studio/):
   a warm hero with a gradient title, a dark teaser, alternating light sections with pill labels, a dark citation block. */
:root {
  --primary: #667eea; --primary-dark: #4f63d2; --text-h: #1a1f36; --text-p: #374151; --text-muted: #6b7280; --text-light: #9ca3af;
  --bg-page: #f8faff; --bg-card: #ffffff; --bg-alt: #f0f4ff; --border: #e5e7eb; --dark: #15130f;
  --shadow-sm: 0 2px 8px rgba(102,126,234,.08); --shadow-md: 0 8px 28px rgba(102,126,234,.14);
  --radius-sm: 8px; --radius-md: 16px; --max-w: 1100px; --nav-h: 64px;
  /* names the case explorer and the charts use */
  --text-primary: var(--text-h); --text-secondary: var(--text-p); --text-faint: var(--text-light);
  --surface-0: var(--bg-page); --surface-1: #fff; --surface-2: var(--bg-alt); --surface-3: #e6ebf7;
  --line: var(--border); --line-soft: #eef0f5; --line-strong: #cfd5e2;
  --accent: var(--primary); --accent-bright: var(--primary-dark); --accent-wash: rgba(102,126,234,.08);
  --good: #0f9f6e; --bad: #dc4a2d; --warn: #d97706;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 12px); }
body { font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: var(--text-p); background: var(--bg-page); line-height: 1.7; overflow-x: hidden; }
a { color: var(--primary-dark); text-decoration: none; } a:hover { text-decoration: underline; }
img, video { max-width: 100%; display: block; }
code { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: .86em; }

.navbar { position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h); background: rgba(255,255,255,.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(229,231,235,.6); display: flex; align-items: center; justify-content: space-between; padding: 0 2rem; z-index: 1000; box-shadow: 0 1px 16px rgba(0,0,0,.06); }
.navbar-brand { display: flex; align-items: center; gap: .6rem; font-weight: 700; font-size: 1.05rem; color: var(--text-h); }
.navbar-brand:hover { text-decoration: none; }
.navbar-brand svg { height: 30px; width: 30px; }
.navbar-links { display: flex; align-items: center; gap: .25rem; list-style: none; }
.navbar-links a { display: inline-flex; align-items: center; gap: .35rem; padding: .4rem .85rem; border-radius: var(--radius-sm); font-size: .88rem; font-weight: 500; color: var(--text-p); }
.navbar-links a:hover { background: var(--bg-alt); color: var(--primary-dark); text-decoration: none; }
.navbar-links a.on { color: var(--primary-dark); font-weight: 700; }
.navbar-links a.btn-nav-primary { background: var(--primary); color: #fff; padding-left: .5rem; padding-right: .7rem; }
.navbar-links a.btn-nav-primary:hover { background: var(--primary-dark); }
.navbar-links a.btn-nav-primary img { height: 26px; width: auto; }

.hero { padding: calc(var(--nav-h) + 4.5rem) 2rem 4.5rem; text-align: center; position: relative; overflow: hidden;
  background: linear-gradient(150deg, #fffdf5 0%, #fef8e8 45%, #fffbf0 100%); }
.hero::before { content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(70% 55% at 15% 20%, rgba(217,119,6,.13) 0%, transparent 60%), radial-gradient(55% 45% at 85% 75%, rgba(180,83,9,.09) 0%, transparent 55%),
    radial-gradient(45% 40% at 70% 15%, rgba(245,158,11,.11) 0%, transparent 50%); }
.hero-inner { position: relative; max-width: 920px; margin: 0 auto; animation: fadeUp .9s ease both; }
.hero-title { font-size: clamp(1.7rem, 4vw, 2.8rem); font-weight: 800; line-height: 1.25; color: #27180a; margin-bottom: 1rem; letter-spacing: -.02em; }
.hero-title svg { height: 1.05em; width: 1.05em; vertical-align: -0.16em; margin-right: .22em; }
.highlight { background: linear-gradient(90deg, #92400e, #d97706); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-subtitle { font-size: 1.05rem; color: #57534e; max-width: 700px; margin: 0 auto 2rem; }
.hero-authors { font-size: .92rem; color: var(--text-p); margin-bottom: .5rem; line-height: 1.9; }
.hero-authors .author { font-weight: 600; }
.hero-affiliations { font-size: .82rem; color: var(--text-muted); margin-bottom: 2.4rem; }
.hero-buttons { display: flex; flex-wrap: wrap; gap: .75rem; justify-content: center; margin-bottom: 3rem; }
.btn { display: inline-flex; align-items: center; gap: .45rem; padding: .65rem 1.4rem; border-radius: var(--radius-sm); font-size: .9rem; font-weight: 600; cursor: pointer;
  transition: transform .15s, box-shadow .15s, background .15s; border: 0; font-family: inherit; }
.btn:hover { transform: translateY(-2px); text-decoration: none; }
.btn svg { width: 15px; height: 15px; }
.btn-primary { background: linear-gradient(135deg, #92400e, #d97706); color: #fff; box-shadow: 0 4px 18px rgba(180,83,9,.3); }
.btn-primary:hover { color: #fff; box-shadow: 0 8px 26px rgba(180,83,9,.42); }
.btn-outline { background: rgba(255,255,255,.7); border: 1.5px solid rgba(161,98,7,.28); color: #78350f; }
.btn-outline:hover { background: #fff; border-color: rgba(161,98,7,.55); }
.btn-dark { background: rgba(255,255,255,.6); border: 1.5px solid rgba(161,98,7,.22); color: #92400e; }
.btn-dark:hover { background: #fff; }
.btn.off { opacity: .55; cursor: default; } .btn.off:hover { transform: none; }
.hero-stats { display: flex; justify-content: center; gap: 3rem; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hero-stat .stat-num { font-size: 1.9rem; font-weight: 800; line-height: 1; }
.hero-stat .stat-num span { background: linear-gradient(90deg, #92400e, #d97706); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-stat .stat-label { font-size: .75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; margin-top: .3rem; }
.hero-stat .stat-note { font-size: .72rem; color: #a8937a; margin-top: .15rem; }

section { padding: 5rem 2rem; }
section.alt { background: var(--bg-alt); }
/* the dark sections take the film's own background, so the teaser sits in it without a seam */
section.dark { background: radial-gradient(90% 70% at 50% 0%, #2a2217 0%, var(--dark) 60%); color: rgba(255,255,255,.85); }
.container { max-width: var(--max-w); margin: 0 auto; }
.section-label { display: inline-flex; align-items: center; gap: .4rem; font-size: .72rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--primary);
  background: rgba(102,126,234,.08); border: 1px solid rgba(102,126,234,.2); padding: .28rem .8rem; border-radius: 999px; margin-bottom: .9rem; }
section.dark .section-label { background: rgba(217,119,6,.14); border-color: rgba(240,163,94,.35); color: #f0a35e; }
.section-title { font-size: clamp(1.5rem, 3.5vw, 2.1rem); font-weight: 800; color: var(--text-h); line-height: 1.2; letter-spacing: -.02em; margin-bottom: .9rem; }
section.dark .section-title { color: #f2eee6; }
.section-desc { font-size: 1.05rem; color: var(--text-muted); max-width: 720px; line-height: 1.75; }
section.dark .section-desc { color: rgba(242,238,230,.6); }
.section-header { margin-bottom: 2.6rem; }
.section-header.centered { text-align: center; } .section-header.centered .section-desc { margin: 0 auto; }
.sub-title { font-size: 1.2rem; font-weight: 800; color: var(--text-h); letter-spacing: -.01em; margin: 0 0 .35rem; }
.sub-desc { color: var(--text-muted); font-size: .95rem; margin-bottom: 1.1rem; max-width: 820px; }

.teaser-frame { border-radius: var(--radius-md); overflow: hidden; box-shadow: 0 30px 80px rgba(0,0,0,.5); background: #000; border: 1px solid rgba(240,163,94,.18); }
.teaser-frame video { width: 100%; aspect-ratio: 16 / 9; background: #000; }
.teaser-note { text-align: center; font-size: .82rem; color: rgba(255,255,255,.45); margin-top: 1rem; }

.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 1.8rem 2rem; box-shadow: var(--shadow-sm); }
.card + .card { margin-top: 1.5rem; }
.grid2 > .card + .card { margin-top: 0; }   /* side by side, not stacked */
.grid2 > .card { display: flex; flex-direction: column; }
.setting-card .formula { margin-top: auto; }
.setting-card p { margin-bottom: .9rem; }
.abstract-card { font-family: "DM Sans", Inter, sans-serif; font-size: 1.05rem; line-height: 1.85; padding: 2.4rem 3rem; }
.abstract-card p + p { margin-top: 1rem; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.setting-card h3 { font-size: 1.05rem; font-weight: 800; color: var(--text-h); margin-bottom: .2rem; }
.setting-card .kicker { font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--primary); }
.setting-card p { font-size: .92rem; color: var(--text-muted); margin-top: .5rem; }
.setting-card .formula { font-size: .86rem; background: var(--bg-alt); border-radius: var(--radius-sm); padding: .6rem .8rem; color: var(--text-h); }

/* the pipeline: prompt -> agent -> code -> scene -> evaluator */
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; margin-top: 2rem; align-items: stretch; }
.flow .step { position: relative; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 1rem 1rem 1.1rem; box-shadow: var(--shadow-sm); margin: 0 14px; }
.flow .step:not(:last-child)::after { content: ""; position: absolute; right: -24px; top: 50%; width: 20px; height: 2px; background: var(--line-strong); }
.flow .step:not(:last-child)::before { content: ""; position: absolute; right: -25px; top: calc(50% - 4px); border: 5px solid transparent; border-left: 7px solid var(--line-strong); border-right: 0; }
.flow .step b { display: block; color: var(--text-h); font-size: .92rem; } .flow .step span { display: block; font-size: .8rem; color: var(--text-muted); line-height: 1.5; margin-top: .25rem; }
.flow .step .n { font-size: .68rem; font-weight: 800; letter-spacing: .08em; color: var(--primary); text-transform: uppercase; }
.flow .step.eval { border-color: rgba(217,119,6,.45); background: #fffaf0; } .flow .step.eval .n { color: #b45309; }

/* charts, tooltips */
.chart-card { padding: 1.6rem 1.8rem 1.4rem; }
.chart-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; flex-wrap: wrap; margin-bottom: .6rem; }
.seg { display: inline-flex; background: var(--bg-alt); border-radius: 999px; padding: 3px; border: 1px solid var(--border); }
.seg button { border: 0; background: transparent; padding: .35rem .9rem; border-radius: 999px; font: 600 .84rem Inter, sans-serif; color: var(--text-muted); cursor: pointer; }
.seg button.on { background: #fff; color: var(--text-h); box-shadow: var(--shadow-sm); }
.lb-tabs { display: flex; justify-content: center; margin: 0 0 1.2rem; position: sticky; top: calc(var(--nav-h) + 10px); z-index: 5; }
.seg-lg { background: rgba(255,255,255,.85); backdrop-filter: blur(8px); box-shadow: var(--shadow-sm); } .seg-lg button { padding: .5rem 1.2rem; font-size: .92rem; }
svg.pareto .band { fill: rgba(26,31,54,.035); } svg.pareto .frontier { stroke: var(--text-h); stroke-width: 1.6; stroke-opacity: .7; }
.note { font-size: .82rem; color: var(--text-muted); margin-top: .8rem; line-height: 1.6; }
.tip { position: fixed; z-index: 2000; pointer-events: none; background: #1a1f36; color: #fff; font-size: .8rem; line-height: 1.45; padding: .5rem .7rem; border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,.25); max-width: 300px; opacity: 0; transform: translate(-50%, calc(-100% - 12px)); transition: opacity .12s; }
.tip.on { opacity: 1; } .tip b { display: block; font-size: .84rem; }
svg.ch [data-tip] { cursor: default; }
svg.pareto .pt circle { transition: r .12s; } svg.pareto .pt:hover circle { r: 8; }
svg.pareto .frontier { fill: none; }

.frontier-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; margin-top: 1.2rem; }
.frontier-list h4 { font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--text-muted); margin-bottom: .3rem; }
.frontier-list div.r { display: flex; justify-content: space-between; font-size: .86rem; padding: .3rem 0; border-bottom: 1px solid var(--line-soft); }
.frontier-list div.r span { color: var(--text-muted); font-variant-numeric: tabular-nums; }

/* leaderboards */
.board { width: 100%; border-collapse: collapse; font-size: .88rem; font-variant-numeric: tabular-nums; }
.board-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-md); background: #fff; box-shadow: var(--shadow-sm); }
.board th { text-align: left; font-size: .7rem; letter-spacing: .07em; text-transform: uppercase; color: var(--text-muted); font-weight: 700; padding: .8rem .75rem; border-bottom: 1px solid var(--border);
  white-space: nowrap; cursor: pointer; user-select: none; background: #fbfcff; }
.board th:hover { color: var(--text-h); } .board th.sorted { color: var(--primary-dark); } .board th.sorted::after { content: " ↓"; } .board th.sorted.asc::after { content: " ↑"; }
.board th.nosort { cursor: default; }
.board td { padding: .65rem .75rem; border-bottom: 1px solid var(--line-soft); white-space: nowrap; }
.board tr:last-child td { border-bottom: 0; }
.board tr:hover td { background: #fafbff; }
.board td.rk { color: var(--text-light); width: 36px; }
.board td.nm { font-weight: 600; color: var(--text-h); }
.board td.nm .org { display: block; font-weight: 500; font-size: .75rem; color: var(--text-muted); margin-left: 26px; margin-top: -2px; }
.board .logo { width: 18px; height: 18px; display: inline-flex; vertical-align: -3px; margin-right: 8px; } .board .logo svg { width: 100%; height: 100%; }
.tag { display: inline-block; font-size: .66rem; font-weight: 700; letter-spacing: .03em; border-radius: 999px; padding: 0 .5rem; margin-left: .45rem; vertical-align: 1px; }
.tag.open { color: #0f766e; background: rgba(15,159,110,.1); border: 1px solid rgba(15,159,110,.25); }
.tag.front { color: var(--primary-dark); background: rgba(102,126,234,.1); border: 1px solid rgba(102,126,234,.25); }
.cellbar { display: flex; align-items: center; gap: .5rem; min-width: 128px; }
.cellbar i { display: block; height: 8px; border-radius: 0 4px 4px 0; background: var(--bar, var(--primary)); max-width: 110px; }
.cellbar b { color: var(--text-h); }
.board td.dim { color: var(--text-muted); }
.board-note { font-size: .8rem; color: var(--text-muted); margin: .7rem .2rem 0; }

/* takeaways */
.tk { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); padding: 2rem 2.2rem; }
.tk + .tk { margin-top: 1.6rem; }
.tk .n { display: inline-block; font-size: .7rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: #b45309; background: rgba(217,119,6,.08);
  border: 1px solid rgba(217,119,6,.22); border-radius: 999px; padding: .15rem .7rem; }
.tk h3 { font-size: 1.3rem; line-height: 1.35; font-weight: 800; color: var(--text-h); letter-spacing: -.01em; margin: .7rem 0 .3rem; }
.tk .s { color: var(--text-muted); font-size: .95rem; }
.tk .figs { margin-top: 1.4rem; display: grid; gap: 1.6rem; }
.tk .figs.two { grid-template-columns: 1.15fr 1fr; align-items: start; }
.tk figure figcaption { font-size: .8rem; color: var(--text-muted); margin-top: .6rem; line-height: 1.5; }
.tk figure .fh { font-size: .8rem; font-weight: 700; color: var(--text-h); margin-bottom: .5rem; }

/* case cards on the home page */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.case-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s; color: inherit; }
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); text-decoration: none; }
.case-card .th { aspect-ratio: 16 / 9; background: #222 center / cover no-repeat; position: relative; }
.case-card .th i { position: absolute; left: 10px; top: 10px; font: 700 .7rem Inter, sans-serif; font-style: normal; color: #fff; background: rgba(15,12,41,.72); padding: .15rem .55rem; border-radius: 999px; }
.case-card .meta { padding: 1rem 1.2rem 1.15rem; }
.case-card .meta h4 { font-size: .98rem; font-weight: 700; color: var(--text-h); }
.case-card .meta p { font-size: .8rem; color: var(--text-muted); margin-top: .15rem; }

/* citation */
.cite-box { position: relative; background: rgba(255,255,255,.04); border: 1px solid rgba(240,163,94,.2); border-radius: var(--radius-md); padding: 1.6rem 1.8rem; max-width: 860px; margin: 0 auto; }
.cite-box pre { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: .83rem; color: rgba(255,255,255,.72); white-space: pre-wrap; line-height: 1.7; }
.cite-copy-btn { position: absolute; top: 1rem; right: 1rem; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2); border-radius: var(--radius-sm); color: rgba(255,255,255,.75);
  padding: .3rem .7rem; font: .78rem Inter, sans-serif; cursor: pointer; }
.cite-copy-btn.copied { background: rgba(217,119,6,.25); border-color: rgba(240,163,94,.5); color: #f0a35e; }
section.dark .btn-outline { background: transparent; border-color: rgba(255,255,255,.25); color: rgba(255,255,255,.85); }
footer { background: #0d0b09; color: rgba(255,255,255,.45); text-align: center; padding: 2rem; font-size: .82rem; }
footer a { color: rgba(255,255,255,.62); }

@keyframes fadeUp { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@media (max-width: 900px) {
  .grid2, .tk .figs.two, .frontier-list { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr 1fr; }
  .flow { grid-template-columns: 1fr; gap: 12px; } .flow .step { margin: 0; } .flow .step::after, .flow .step::before { display: none; }
}
@media (max-width: 768px) {
  section { padding: 3.5rem 1rem; }
  .hero { padding: calc(var(--nav-h) + 2.5rem) 1rem 3.5rem; }
  .navbar { padding: 0 1rem; } .navbar-links a { padding: .35rem .5rem; font-size: .8rem; } .navbar-links .hide-sm { display: none; }
  .abstract-card { padding: 1.6rem; } .tk { padding: 1.4rem 1.2rem; } .card { padding: 1.3rem 1.1rem; }
  .case-grid { grid-template-columns: 1fr; } .hero-stats { gap: 1.6rem; }
}