/* ===== REMA project page — light lavender theme ===== */

:root {
  --bg: #f7f6fb;
  --bg-deep: #efedf7;
  --panel: #ffffff;
  --panel-soft: #f5f3fa;
  --panel-strong: #ece9f6;
  --line: rgba(74, 63, 122, 0.14);
  --text: #2b2640;
  --muted: #6d6787;
  --accent: #7c6bd6;
  --accent-deep: #5f4fc0;
  --accent-soft: #a99cf0;
  --good: #3f9d6e;
  --danger: #d6537a;
  --icon-halo: #bcc0da;
  --shadow: 0 18px 50px rgba(83, 71, 148, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
  --max-width: 1180px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  font-family: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.65;
  background:
    radial-gradient(circle at top left, rgba(124, 107, 214, 0.10), transparent 30%),
    radial-gradient(circle at 80% 10%, rgba(169, 156, 240, 0.14), transparent 34%),
    linear-gradient(180deg, #f7f6fb 0%, #efedf7 48%, #f7f6fb 100%);
  background-attachment: fixed;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(74, 63, 122, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 63, 122, 0.045) 1px, transparent 1px);
  background-size: 36px 36px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,0.55), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.55), transparent 88%);
  z-index: 0;
}

main, header, footer { position: relative; z-index: 1; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 860px; }
.narrow-text { max-width: 860px; color: var(--muted); margin-bottom: 28px; }

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

.sr-only {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}

/* ===== Navigation ===== */
.nav-wrap {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(247, 246, 251, 0.78);
  border-bottom: 1px solid var(--line);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 1.15rem; letter-spacing: 0.06em;
  color: var(--text);
}
.nav-brand:hover { text-decoration: none; color: var(--accent-deep); }
.nav-brand img {
  width: 28px; height: 28px;
  border-radius: 50%;
  display: block;
}

.nav-links { display: flex; gap: 22px; flex-wrap: wrap; }
.nav-links a {
  color: var(--muted); font-size: 0.92rem; font-weight: 500;
  transition: color 0.2s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent-deep); text-decoration: none; }

/* ===== Hero ===== */
.hero { padding: 64px 0 48px; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
}

/* Project icon: radial mask fades the image edge into a halo of the
   icon's own background color, so it merges with the page background. */
.project-icon-wrap {
  position: relative;
  width: 148px; height: 148px;
  margin-bottom: 18px;
}
.project-icon-wrap::before {
  content: "";
  position: absolute;
  inset: -40px;
  background: radial-gradient(circle,
    var(--icon-halo) 0%,
    var(--icon-halo) 34%,
    rgba(188, 192, 218, 0.42) 55%,
    rgba(188, 192, 218, 0.0) 80%);
  z-index: 0;
}
.project-icon {
  position: relative;
  width: 100%; height: 100%;
  display: block;
  -webkit-mask-image: radial-gradient(circle, #000 40%, rgba(0,0,0,0.35) 60%, transparent 75%);
  mask-image: radial-gradient(circle, #000 40%, rgba(0,0,0,0.35) 60%, transparent 75%);
  z-index: 1;
}

.venue-badge {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--accent-deep);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  line-height: 1.22;
  font-weight: 800;
  margin-bottom: 16px;
}
.hero-title em { color: var(--accent-deep); font-style: italic; }

.hero-subtitle {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 24px;
  max-width: 560px;
}

.authors { font-size: 0.98rem; margin-bottom: 10px; }
.authors sup { color: var(--muted); }
.affiliations { color: var(--muted); font-size: 0.85rem; margin-bottom: 26px; }

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary { background: var(--accent); color: #ffffff; }
.btn-primary:hover { background: var(--accent-deep); }

.btn-outline { border-color: var(--line); background: var(--panel); color: var(--text); }
.btn-outline:hover { border-color: var(--accent); }

.btn.disabled { opacity: 0.5; cursor: default; pointer-events: none; }

/* ===== Figures ===== */
.figure-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow);
  margin: 0 0 28px;
}
.figure-card img { width: 100%; height: auto; display: block; border-radius: 10px; background: #fff; }
.figure-card figcaption { color: var(--muted); font-size: 0.86rem; margin-top: 12px; line-height: 1.55; }

.hero-figure { margin-bottom: 0; }

/* ===== Metric cards ===== */
.metric-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 48px;
}
.metric-strip.compact { margin: 8px 0 40px; }

.metric-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 20px 18px;
  text-align: center;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.metric-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.metric-value {
  display: block;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  font-weight: 800;
  color: var(--accent-deep);
  margin-bottom: 6px;
  white-space: nowrap;
}
.metric-label { color: var(--muted); font-size: 0.82rem; line-height: 1.4; display: block; }

/* ===== Sections ===== */
.section { padding: 72px 0; }
.section-alt {
  background: rgba(124, 107, 214, 0.05);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

h2 {
  font-size: clamp(1.45rem, 2.6vw, 1.95rem);
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.25;
}

.sub-heading { font-size: 1.2rem; font-weight: 700; margin: 40px 0 12px; color: var(--text); }

.lede { font-size: 1.02rem; color: var(--text); }

/* ===== Problem cards ===== */
.card-duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 28px 0;
}

.info-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px;
}
.info-card.good { border-left: 3px solid var(--good); }
.info-card.bad { border-left: 3px solid var(--danger); }
.info-card p { color: var(--muted); font-size: 0.95rem; }

.card-tag {
  display: inline-block;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 8px;
}
.tag-good { color: var(--good); }
.tag-bad { color: var(--danger); }

/* ===== Method stages ===== */
.stage-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin: 32px 0;
}

.stage-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.stage-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.stage-num {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.14em;
  margin-bottom: 10px;
}
.stage-card h3 { font-size: 1.05rem; margin-bottom: 10px; }
.stage-card p { color: var(--muted); font-size: 0.92rem; }

/* ===== Plug-in panel ===== */
.plugin-panel {
  background: linear-gradient(135deg, rgba(124, 107, 214, 0.10), rgba(169, 156, 240, 0.10));
  border: 1px solid rgba(124, 107, 214, 0.30);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-top: 36px;
}
.plugin-panel h3 { font-size: 1.15rem; margin-bottom: 12px; }
.plugin-headline { font-weight: 700; color: var(--accent-deep); margin-bottom: 10px; }
.plugin-panel p { color: var(--text); font-size: 0.97rem; }
.plugin-panel.limitation {
  background: var(--panel);
  border-color: var(--line);
}
.plugin-panel.limitation p { color: var(--muted); }

/* ===== Task cards ===== */
.task-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin: 24px 0 32px;
}

.task-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 20px 18px;
}
.task-card h4 { font-size: 1rem; margin-bottom: 8px; color: var(--accent-deep); }
.task-card p { color: var(--muted); font-size: 0.88rem; }
.task-platform {
  display: block;
  margin-top: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.02em;
}

/* ===== Table ===== */
.table-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow);
}
.table-scroll { overflow-x: auto; }

table { width: 100%; border-collapse: collapse; font-size: 0.94rem; }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: 0.85rem; letter-spacing: 0.04em; text-transform: uppercase; }
tbody tr:last-child td { border-bottom: none; }
td.best { color: var(--accent-deep); font-weight: 700; }

.table-note { color: var(--muted); font-size: 0.82rem; margin-top: 12px; }

/* ===== Videos ===== */
.video-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow);
  margin: 0 0 32px;
}
.video-card video { width: 100%; border-radius: 10px; display: block; background: #000; }
.video-card figcaption { color: var(--muted); font-size: 0.86rem; margin-top: 12px; }

.main-video { max-width: 900px; margin-left: auto; margin-right: auto; }
div.main-video { margin-bottom: 32px; }

.video-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.video-placeholder {
  background: var(--panel-soft);
  border: 1px dashed var(--line);
  border-radius: var(--radius-md);
  padding: 44px 24px;
  text-align: center;
  color: var(--muted);
}
.video-placeholder .ph-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 52px; height: 52px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--accent);
  font-size: 1.1rem;
  margin-bottom: 14px;
}
.video-placeholder h4 { color: var(--text); font-size: 0.98rem; margin-bottom: 6px; }
.video-placeholder p { font-size: 0.85rem; }

/* ===== Analysis ===== */
.analysis-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-top: 8px;
}
.analysis-block h3 { font-size: 1.12rem; margin-bottom: 10px; }
.analysis-block > p { color: var(--muted); font-size: 0.95rem; margin-bottom: 18px; }

/* ===== BibTeX ===== */
.bibtex-card {
  position: relative;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow);
}
.bibtex-card pre { overflow-x: auto; }
.bibtex-card code {
  font-family: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;
  font-size: 0.84rem;
  color: #453d6b;
  line-height: 1.6;
}

.copy-btn {
  position: absolute;
  top: 14px; right: 14px;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.copy-btn:hover { border-color: var(--accent); background: var(--panel-strong); }
.copy-btn.copied { color: var(--good); border-color: var(--good); }

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--line);
  padding: 36px 0 48px;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

/* ===== Reveal on scroll ===== */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* JS disabled: keep everything visible */
.no-js .reveal { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .metric-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stage-grid { grid-template-columns: 1fr; }
  .task-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .analysis-grid { grid-template-columns: 1fr; }
  .wide-only { display: none; }
}

@media (max-width: 620px) {
  .hero { padding: 44px 0 36px; }
  .section { padding: 52px 0; }
  .metric-strip { grid-template-columns: 1fr 1fr; }
  .card-duo, .task-grid, .video-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 0.85rem; }
  .metric-value { white-space: normal; }
  .project-icon-wrap { width: 116px; height: 116px; }
}