/* ============================================================
   UniMPA project page
   ============================================================ */

:root {
  --bg: #07080c;
  --bg-alt: #0c0e15;
  --panel: #11131c;
  --panel-2: #161925;
  --line: rgba(255, 255, 255, .09);
  --line-strong: rgba(255, 255, 255, .16);
  --fg: #e9eaf0;
  --fg-dim: #a2a7b8;
  --fg-faint: #6d738a;
  --accent: #8b7cf6;
  --accent-2: #4dd0e1;
  --accent-3: #f2a1c0;
  --ours: rgba(139, 124, 246, .13);
  --radius: 16px;
  --maxw: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 76px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16.5px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre { font-family: 'JetBrains Mono', ui-monospace, monospace; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 860px; }

/* ---------------- nav ---------------- */
.topnav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(7, 8, 12, .78);
  backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  height: 60px; display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.nav-brand {
  font-weight: 800; letter-spacing: -.02em; font-size: 1.12rem; color: var(--fg);
}
.nav-brand:hover { text-decoration: none; color: var(--accent); }
.nav-links { display: flex; gap: 22px; overflow-x: auto; }
.nav-links a {
  color: var(--fg-dim); font-size: .875rem; font-weight: 500; white-space: nowrap;
  padding: 4px 0; border-bottom: 2px solid transparent;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--fg); border-bottom-color: var(--accent); text-decoration: none;
}

/* ---------------- hero ---------------- */
.hero {
  position: relative; overflow: hidden;
  padding: 84px 0 60px;
  text-align: center;
  border-bottom: 1px solid var(--line);
}
.hero-glow {
  position: absolute; inset: -40% 0 auto 0; height: 720px; pointer-events: none;
  background:
    radial-gradient(46% 52% at 22% 12%, rgba(139, 124, 246, .30), transparent 62%),
    radial-gradient(44% 50% at 78% 4%, rgba(77, 208, 225, .20), transparent 62%),
    radial-gradient(40% 40% at 50% 40%, rgba(242, 161, 192, .12), transparent 66%);
  filter: blur(6px);
}
.hero .container { position: relative; }

.eyebrow {
  display: inline-block; margin-bottom: 22px;
  font-size: .74rem; font-weight: 600; letter-spacing: .18em; text-transform: uppercase;
  color: var(--accent-2);
  border: 1px solid var(--line-strong); border-radius: 999px;
  padding: 6px 16px; background: rgba(255, 255, 255, .03);
}

.hero-title {
  margin: 0 auto 26px;
  max-width: 1100px;
  font-size: clamp(1.6rem, 3.25vw, 2.45rem);
  font-weight: 800; line-height: 1.2; letter-spacing: -.028em;
}
.hero-title .title-line {
  display: block;
  text-wrap: balance;
  text-align: center;
}
.hero-title .accent {
  background: linear-gradient(92deg, var(--accent) 0%, var(--accent-3) 48%, var(--accent-2) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
}

.authors { font-size: 1.03rem; font-weight: 500; margin-bottom: 10px; }
.authors a { color: var(--fg); }
.authors a:hover { color: var(--accent); text-decoration: none; }
.authors sup { color: var(--accent); font-size: .7em; }

.affiliations {
  display: flex; flex-wrap: wrap; gap: 8px 26px; justify-content: center;
  color: var(--fg-dim); font-size: .93rem;
}
.affiliations sup { color: var(--accent); }
.corresponding { color: var(--fg-faint); font-size: .82rem; margin-top: 4px; }

.hero-lead {
  max-width: 780px; margin: 30px auto 0;
  color: var(--fg-dim); font-size: 1.03rem;
}
.hero-lead strong { color: var(--fg); font-weight: 600; }
.hero-lead em { color: var(--accent-3); font-style: normal; }

/* buttons */
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 34px; }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 11px 22px; border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, .045);
  color: var(--fg); font-size: .92rem; font-weight: 600;
  transition: transform .16s ease, background .16s ease, border-color .16s ease;
}
.btn:hover {
  text-decoration: none; transform: translateY(-2px);
  background: rgba(255, 255, 255, .1); border-color: var(--accent);
}
.btn-primary {
  background: linear-gradient(96deg, var(--accent), #6d5df0);
  border-color: transparent; color: #fff;
}
.btn-primary:hover { background: linear-gradient(96deg, #9c8ffa, #7b6cf5); }
.btn-ico { font-size: 1rem; line-height: 1; }

/* placeholder buttons: no dead links until the URLs exist */
.btn-disabled { opacity: .48; cursor: not-allowed; }
.btn-disabled:hover {
  transform: none; background: rgba(255, 255, 255, .045); border-color: var(--line-strong);
}
.btn-primary.btn-disabled:hover { background: linear-gradient(96deg, var(--accent), #6d5df0); }
.btn-soon {
  font-size: .66rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  padding: 2px 7px; border-radius: 999px;
  background: rgba(0, 0, 0, .3); border: 1px solid rgba(255, 255, 255, .22);
}

/* stats */
.stat-strip {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 12px;
  margin-top: 48px;
}
.stat {
  flex: 1 1 150px; max-width: 210px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 14px;
}
.stat-num {
  font-size: 1.6rem; font-weight: 800; letter-spacing: -.03em;
  background: linear-gradient(92deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-num span { font-size: .68em; }
.stat-lab {
  margin-top: 2px; font-size: .76rem; color: var(--fg-faint);
  text-transform: uppercase; letter-spacing: .09em; font-weight: 600;
}

/* ---------------- sections ---------------- */
.section { padding: 78px 0; }
.section-tight { padding: 44px 0 20px; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-title {
  margin: 0 0 12px;
  font-size: clamp(1.5rem, 2.6vw, 2.05rem);
  font-weight: 750; letter-spacing: -.024em; text-align: center;
}
.sub-title {
  margin: 56px 0 22px; text-align: center;
  font-size: 1.22rem; font-weight: 700; letter-spacing: -.02em; color: var(--fg);
}
.section-sub {
  max-width: 860px; margin: 0 auto 40px; text-align: center;
  color: var(--fg-dim); font-size: .98rem;
}
.section-sub strong { color: var(--fg); }

.abstract-body p { color: var(--fg-dim); margin: 0 0 18px; }
.abstract-body strong { color: var(--fg); font-weight: 600; }
.abstract-body em { color: var(--accent-3); font-style: normal; }

/* ---------------- figures ---------------- */
.figure {
  margin: 0 0 26px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px; overflow: hidden;
}
.figure img { border-radius: 9px; width: 100%; background: #fff; }
.figure figcaption {
  margin-top: 13px; padding: 0 4px;
  color: var(--fg-faint); font-size: .855rem; line-height: 1.62;
}
.figure figcaption strong { color: var(--fg-dim); }

.figure-duo {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 20px;
}

/* full-width feature figure (roughly 2x a .figure-duo cell) */
.figure-hero { margin-bottom: 20px; }
.figure-hero figcaption { max-width: 900px; margin-left: auto; margin-right: auto; }

/* forced 2-column grid, regardless of how many items follow */
.figure-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 720px) {
  .figure-grid-2 { grid-template-columns: 1fr; }
}

/* ---------------- cards ---------------- */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(258px, 1fr)); gap: 18px;
}
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 22px;
  transition: transform .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--line-strong); }
.card-ico { font-size: 1.7rem; line-height: 1; margin-bottom: 14px; }
.card h3 {
  margin: 0 0 10px; font-size: 1.03rem; font-weight: 700; letter-spacing: -.015em;
  color: var(--fg);
}
.card p { margin: 0; color: var(--fg-dim); font-size: .91rem; line-height: 1.68; }
.card p strong { color: var(--fg); }
.card p em { color: var(--accent-3); font-style: normal; }

/* numbered list */
.numbered-list {
  counter-reset: nl; list-style: none; padding: 0; margin: 26px 0 40px;
  display: grid; gap: 14px;
}
.numbered-list li {
  counter-increment: nl; position: relative;
  padding: 16px 20px 16px 58px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  color: var(--fg-dim); font-size: .93rem;
}
.numbered-list li::before {
  content: counter(nl);
  position: absolute; left: 18px; top: 16px;
  width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center;
  background: rgba(139, 124, 246, .16); color: var(--accent);
  font-size: .8rem; font-weight: 700;
}
.numbered-list li strong { color: var(--fg); }

/* ---------------- training stages ---------------- */
.stage-flow {
  display: flex; align-items: stretch; gap: 12px; flex-wrap: wrap; justify-content: center;
}
.stage {
  flex: 1 1 250px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 22px;
}
.stage-num {
  width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center; margin-bottom: 14px;
  background: linear-gradient(135deg, var(--accent), #6d5df0);
  color: #fff; font-weight: 800; font-size: .95rem;
}
.stage h3 { margin: 0 0 9px; font-size: 1rem; font-weight: 700; }
.stage p { margin: 0; color: var(--fg-dim); font-size: .9rem; }
.stage-arrow {
  align-self: center; color: var(--accent); font-size: 1.5rem; flex: 0 0 auto;
}

/* ---------------- video slots ---------------- */
.video-frame {
  position: relative; width: 100%; aspect-ratio: 16 / 9;
  background: var(--panel-2);
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden;
}
.video-frame-wide { max-width: 960px; margin: 0 auto; }
.video-frame video, .video-frame iframe {
  width: 100%; height: 100%; display: block; object-fit: cover; border: 0;
}

.video-placeholder {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 9px;
  background:
    repeating-linear-gradient(45deg, rgba(255,255,255,.017) 0 12px, transparent 12px 24px),
    radial-gradient(60% 70% at 50% 40%, rgba(139,124,246,.14), transparent 70%);
  color: var(--fg-faint);
}
.ph-play {
  width: 54px; height: 54px; border-radius: 50%;
  display: grid; place-items: center;
  border: 1px solid var(--line-strong); background: rgba(255, 255, 255, .05);
  color: var(--accent); font-size: 1.15rem; padding-left: 4px;
}
.ph-title {
  font-size: .9rem; font-weight: 600; letter-spacing: .04em;
  text-transform: uppercase; color: var(--fg-dim);
}
.video-placeholder code {
  font-size: .74rem; color: var(--fg-faint);
  background: rgba(0, 0, 0, .35); border: 1px solid var(--line);
  padding: 3px 9px; border-radius: 6px;
}
.video-note {
  text-align: center; color: var(--fg-faint); font-size: .83rem; margin: 14px 0 0;
}

.video-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px;
  margin: 34px 0 44px;
}
.video-card { display: flex; flex-direction: column; gap: 12px; }
.video-meta h4 { margin: 6px 0 6px; font-size: .98rem; font-weight: 700; letter-spacing: -.012em; }
.video-meta p { margin: 0; color: var(--fg-dim); font-size: .875rem; line-height: 1.62; }
.video-meta p strong { color: var(--accent-2); }
.tag {
  display: inline-block; font-size: .68rem; font-weight: 700;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); background: rgba(139, 124, 246, .13);
  border: 1px solid rgba(139, 124, 246, .3); border-radius: 999px; padding: 2px 10px;
}

/* ---------------- tabs & tables ---------------- */
.tabs {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 28px;
}
.tab {
  font: inherit; font-size: .875rem; font-weight: 600; cursor: pointer;
  padding: 9px 18px; border-radius: 999px;
  color: var(--fg-dim); background: var(--panel); border: 1px solid var(--line);
  transition: color .15s, background .15s, border-color .15s;
}
.tab:hover { color: var(--fg); border-color: var(--line-strong); }
.tab.is-active {
  color: #fff; background: linear-gradient(96deg, var(--accent), #6d5df0); border-color: transparent;
}

.tab-panel { display: none; }
.tab-panel.is-active { display: block; animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.table-note {
  max-width: 900px; margin: 0 auto 18px; text-align: center;
  color: var(--fg-faint); font-size: .875rem;
}
.table-note strong, .table-note b { color: var(--fg-dim); }

.table-wrap {
  overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--panel); margin-bottom: 18px;
}
table { width: 100%; border-collapse: collapse; font-size: .875rem; white-space: nowrap; }
thead th {
  position: sticky; top: 0;
  background: var(--panel-2); color: var(--fg-dim);
  font-weight: 600; font-size: .8rem; text-align: center;
  padding: 11px 13px; border-bottom: 1px solid var(--line-strong);
}
tbody td {
  padding: 10px 13px; text-align: center; color: var(--fg-dim);
  border-bottom: 1px solid rgba(255, 255, 255, .045);
}
tbody td:first-child, thead th:first-child { text-align: left; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: rgba(255, 255, 255, .022); }
tbody td em { color: var(--fg-faint); font-style: normal; font-size: .82em; }
tbody td b { color: var(--fg); }

tbody tr.ours td {
  background: var(--ours); color: var(--fg);
  border-top: 1px solid rgba(139, 124, 246, .3);
  border-bottom: 1px solid rgba(139, 124, 246, .3);
}
tbody tr.ours:hover td { background: rgba(139, 124, 246, .2); }
tbody tr.ours td b { color: #cfc6ff; }

/* ---------------- findings ---------------- */
.finding-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px;
}
.finding {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 20px;
}
.finding-num {
  font-size: 1.35rem; font-weight: 800; letter-spacing: -.02em; margin-bottom: 6px;
  color: var(--accent-3);
}
.finding p { margin: 0; color: var(--fg-dim); font-size: .875rem; line-height: 1.62; }
.finding p strong { color: var(--fg); }

/* ---------------- code block ---------------- */
.code-block {
  position: relative;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 22px 18px;
}
.code-block pre {
  margin: 0; overflow-x: auto;
  color: var(--fg-dim); font-size: .82rem; line-height: 1.75;
}
.copy-btn {
  position: absolute; top: 12px; right: 12px;
  font: inherit; font-size: .74rem; font-weight: 600; cursor: pointer;
  padding: 5px 13px; border-radius: 8px;
  background: rgba(255, 255, 255, .06); border: 1px solid var(--line-strong); color: var(--fg-dim);
}
.copy-btn:hover { color: var(--fg); border-color: var(--accent); }

/* ---------------- footer ---------------- */
.footer {
  padding: 44px 0 56px; border-top: 1px solid var(--line);
  text-align: center; color: var(--fg-faint); font-size: .875rem;
}
.footer p { margin: 0 0 6px; }
.footer-fine { font-size: .78rem; color: #4c5265; }

/* ---------------- responsive ---------------- */
@media (max-width: 760px) {
  body { font-size: 15.5px; }
  .hero { padding: 56px 0 44px; }
  .section { padding: 56px 0; }
  .nav-links { gap: 16px; }
  .stage-arrow { transform: rotate(90deg); }
  .stat { flex-basis: 44%; max-width: none; }
}