/* =====================================================================
   SensorGen — clean, big-tech long-scroll project page
   ===================================================================== */
:root {
  --white: #ffffff;
  --bg: #ffffff;
  --bg-alt: #f7f6fb;
  --bg-soft: #faf9fe;

  --accent: #674ea7;        /* brand purple */
  --accent-dark: #4a3680;
  --accent-light: #8e7cc3;
  --accent-soft: #efeafb;
  --accent-line: rgba(103, 78, 167, 0.16);
  --accent-glow: rgba(103, 78, 167, 0.10);

  --green: #5d9b3f;
  --green-dark: #437029;
  --green-soft: #eaf4e3;

  --text: #1b1730;
  --text-2: #4f4866;
  --text-3: #857d96;

  --border: #ece8f3;
  --border-2: #e2dcee;
  --card: #ffffff;

  --radius: 16px;
  --radius-sm: 12px;
  --shadow-sm: 0 1px 2px rgba(27, 23, 48, 0.04), 0 2px 8px rgba(27, 23, 48, 0.04);
  --shadow: 0 4px 14px rgba(27, 23, 48, 0.06), 0 12px 32px rgba(27, 23, 48, 0.06);
  --nav-h: 60px;
  --maxw: 1080px;
}

/* ===== Reset & base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'Inter', 'Noto Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
sup { font-size: 0.7em; }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-alt); }
::-webkit-scrollbar-thumb { background: var(--accent-light); border-radius: 4px; }
::selection { background: var(--accent); color: #fff; }

/* ===== Layout helpers ===== */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }
.container.narrow { max-width: 760px; }

.band { padding: clamp(3.5rem, 7vw, 6rem) 0; scroll-margin-top: var(--nav-h); }
.band.alt { background: var(--bg-alt); }

/* ===== Navigation ===== */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between; padding: 0 1.5rem;
}
.nav-brand { font-weight: 800; font-size: 1.15rem; letter-spacing: -0.02em; }
.nav-brand span {
  background: linear-gradient(120deg, var(--green) 0%, var(--accent) 45%, var(--accent-dark) 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 0.15rem; list-style: none; align-items: center; }
.nav-links a {
  display: block; color: var(--text-2); font-size: 0.9rem; font-weight: 500;
  padding: 0.45rem 0.85rem; border-radius: 8px; transition: color .18s, background .18s; cursor: pointer;
}
.nav-links a:hover { color: var(--text); background: var(--accent-soft); }
.nav-links a.active { color: var(--accent-dark); background: var(--accent-soft); font-weight: 600; }

.nav-dropdown { position: relative; }
.dropdown-trigger { display: flex; align-items: center; gap: 0.3rem; }
.dropdown-trigger i { font-size: 0.7rem; transition: transform .2s; }
.nav-dropdown.open .dropdown-trigger i { transform: rotate(180deg); }
.dropdown-menu {
  display: none; position: absolute; top: 100%; right: 0; min-width: 290px;
  background: #fff; border: 1px solid var(--border-2); border-radius: 12px; padding: 0.4rem 0;
  margin-top: 0.4rem; list-style: none; box-shadow: var(--shadow); z-index: 100;
}
.nav-dropdown.open .dropdown-menu { display: block; }
.dropdown-menu li a { display: block; padding: 0.55rem 1rem; font-size: 0.85rem; color: var(--text-2); border-radius: 0; }
.dropdown-menu li a:hover { color: var(--accent); background: var(--accent-soft); }

.nav-toggle { display: none; background: none; border: none; color: var(--text); font-size: 1.3rem; cursor: pointer; }

@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0.1rem;
    background: #fff; padding: 0.75rem 1.25rem; border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .dropdown-menu { position: static; box-shadow: none; border: none; border-left: 2px solid var(--accent-line); border-radius: 0; margin: 0 0 0 0.5rem; min-width: 0; }
}

/* ===== Hero ===== */
.hero {
  padding: calc(var(--nav-h) + 3.5rem) 0 3rem;
  background:
    radial-gradient(900px 380px at 80% -10%, var(--accent-glow), transparent 60%),
    radial-gradient(700px 360px at 0% 120%, var(--green-soft), transparent 55%),
    linear-gradient(180deg, var(--bg-soft), var(--white) 70%);
}
.hero-inner { text-align: center; }
.hero-badge {
  display: inline-block; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.02em;
  color: var(--accent-dark); background: var(--accent-soft); border: 1px solid var(--accent-line);
  padding: 0.3rem 0.85rem; border-radius: 999px; margin-bottom: 1.4rem;
}
.badge-todo { color: var(--text-3); font-weight: 500; }
.hero-title {
  font-size: clamp(2.6rem, 7vw, 4.5rem); font-weight: 800; line-height: 1.12; letter-spacing: -0.03em;
  background: linear-gradient(120deg, var(--green) 0%, var(--accent) 38%, var(--accent-dark) 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 0.6rem; padding-bottom: 0.12em;
}
.hero-subtitle {
  font-size: clamp(1.05rem, 2.4vw, 1.5rem); font-weight: 500; color: var(--text-2);
  max-width: 760px; margin: 0 auto 2rem; line-height: 1.4;
}
.authors { margin-bottom: 0.5rem; line-height: 1.9; }
.author-block { display: inline-block; font-size: 1rem; margin: 0 0.1rem; }
.authors a { color: var(--accent); }
.authors a:hover { color: var(--accent-dark); text-decoration: underline; }
.affiliation { color: var(--text-2); font-size: 0.9rem; margin-bottom: 1.8rem; line-height: 1.7; }

.link-buttons { display: flex; justify-content: center; flex-wrap: wrap; gap: 0.7rem; margin-bottom: 2.2rem; }
.link-buttons a {
  display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.6rem 1.25rem;
  border-radius: 999px; font-size: 0.9rem; font-weight: 600; color: #fff;
  background: var(--accent); border: 1px solid var(--accent); transition: all .18s;
}
.link-buttons a:hover { background: var(--accent-dark); border-color: var(--accent-dark); transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.link-buttons a.btn-disabled { opacity: 0.5; pointer-events: none; background: var(--text-3); border-color: var(--text-3); }
.link-buttons .icon { font-size: 1.05rem; display: inline-flex; }

.hero-tagline {
  max-width: 980px; margin: 0 auto 2.5rem; color: var(--text-2); font-size: 1rem; line-height: 1.6;
}
.hero-tagline strong { color: var(--text); }
.hero-figure {
  max-width: 860px; margin: 0 auto; background: #fff; padding: 0.75rem;
  border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
}
.hero-video {
  display: block; width: 100%; height: auto; aspect-ratio: 2160 / 896;
  border-radius: 8px; background: #fff;
}

/* ===== Stat strip ===== */
.stat-strip {
  margin-top: 2.75rem;
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 1rem;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem 1rem; box-shadow: var(--shadow-sm);
}
.stat { text-align: center; }
.stat-num {
  display: block; font-size: clamp(1.8rem, 3.5vw, 2.5rem); font-weight: 800; line-height: 1; letter-spacing: -0.02em;
  color: var(--accent);
}
.stat-label { display: block; margin-top: 0.4rem; font-size: 0.78rem; color: var(--text-3); font-weight: 500; }
@media (max-width: 820px) { .stat-strip { grid-template-columns: repeat(3, 1fr); gap: 1.25rem 0.5rem; } }
@media (max-width: 440px) { .stat-strip { grid-template-columns: repeat(2, 1fr); } }

/* ===== Section headers ===== */
.eyebrow {
  text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.78rem; font-weight: 700;
  color: var(--accent); margin-bottom: 0.7rem;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2.05rem); font-weight: 800; letter-spacing: -0.02em; line-height: 1.2;
  color: var(--text); margin-bottom: 1rem; max-width: 1000px;
}
.section-lead { font-size: 1.05rem; color: var(--text-2); line-height: 1.75; max-width: 780px; margin-bottom: 2.25rem; }
.section-lead strong { color: var(--text); }
.section-note { font-size: 1rem; color: var(--text-2); margin-top: 1.5rem; }
.inline-link { color: var(--accent); font-weight: 600; }
.inline-link:hover { text-decoration: underline; }

.grid-label {
  font-size: 0.82rem; font-weight: 700; color: var(--text-3); text-transform: uppercase;
  letter-spacing: 0.08em; margin: 2.5rem 0 1rem;
}
.theme-head {
  display: flex; align-items: baseline; gap: 0.75rem;
  font-size: clamp(1.25rem, 2.6vw, 1.6rem); font-weight: 700; letter-spacing: -0.01em; color: var(--text);
  margin: 3rem 0 1.5rem; padding-bottom: 0.85rem; border-bottom: 1px solid var(--border);
}
.theme-head:first-of-type { margin-top: 1rem; }
.theme-num { font-size: 0.95rem; font-weight: 800; color: var(--accent); background: var(--accent-soft); border-radius: 8px; padding: 0.15rem 0.55rem; }

/* ===== Cards & grids ===== */
.card-grid { display: grid; gap: 1.1rem; }
.card-grid.two { grid-template-columns: repeat(2, 1fr); }
.card-grid.three { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 820px) { .card-grid.two, .card-grid.three { grid-template-columns: 1fr; } }
@media (min-width: 560px) and (max-width: 820px) { .card-grid.three.compact { grid-template-columns: repeat(2, 1fr); } }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 1.5rem; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--border-2); }
.card h4 { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 0.45rem; display: flex; align-items: center; gap: 0.5rem; }
.card p { font-size: 0.92rem; color: var(--text-2); line-height: 1.65; }
.card h4 i { color: var(--accent); font-size: 0.95em; }

.stat-card .card-stat { display: block; font-size: 1.5rem; font-weight: 800; color: var(--accent); letter-spacing: -0.01em; margin-bottom: 0.35rem; }
.domain-card { border-left: 3px solid var(--green); }
.domain-card h4 i { color: var(--green); }

.task-card { position: relative; }
.task-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; font-size: 1.1rem; color: #fff;
  background: var(--accent); border-radius: 10px; margin-bottom: 0.85rem;
}
.task-fams { list-style: none; margin-top: 0.75rem; display: flex; flex-direction: column; gap: 0.3rem; }
.task-fams li { font-size: 0.85rem; color: var(--text-2); padding-left: 1.1rem; position: relative; }
.task-fams li::before { content: '→'; position: absolute; left: 0; color: var(--accent-light); }

.card.mini { padding: 1.1rem 1.25rem; }
.card.mini h4 { font-size: 0.95rem; margin-bottom: 0.25rem; }
.card.mini p { font-size: 0.85rem; }
.card.mini.accent { background: var(--accent-soft); border-color: var(--accent-line); }
.card.mini.accent h4 { color: var(--accent-dark); }

/* ===== Figures / tables ===== */
.figure-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 1rem; box-shadow: var(--shadow-sm);
}
.figure-card img { width: 100%; border-radius: 8px; background: #fff; }
.figure-card figcaption { margin-top: 0.7rem; color: var(--text-2); font-size: 0.8rem; line-height: 1.5; }
.feature-figure { max-width: 920px; margin: 1.75rem auto 0; }
.feature-figure.wide { max-width: 100%; }

/* two coverage pies side by side */
.pie-row { display: grid; grid-template-columns: 3fr 2fr; gap: 1.25rem; align-items: stretch; margin: 1.75rem 0 0; }
.pie-row .figure-card { margin: 0; display: flex; flex-direction: column; justify-content: center; }
@media (max-width: 760px) { .pie-row { grid-template-columns: 1fr; } }

.table-figure {
  margin: 2rem 0; background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem; box-shadow: var(--shadow-sm); overflow-x: auto;
}
.table-figure img { width: 100%; min-width: 540px; border-radius: 6px; }
.table-figure figcaption { margin-top: 0.9rem; color: var(--text-2); font-size: 0.9rem; line-height: 1.6; }

/* ===== Feature rows (figure + takeaway) ===== */
.feature-row {
  display: grid; grid-template-columns: 1fr 1.15fr; gap: 2.5rem; align-items: center;
  margin: 2rem 0;
}
.feature-row.reverse .feature-body { order: 2; }
.feature-row.reverse .feature-media { order: 1; }
.feature-body h4 { font-size: 1.3rem; font-weight: 700; line-height: 1.3; color: var(--text); margin-bottom: 0.85rem; letter-spacing: -0.01em; }
.feature-body p { color: var(--text-2); font-size: 0.98rem; line-height: 1.75; }
.feature-media .figure-card { margin: 0; }
.feature-media.stacked { display: flex; flex-direction: column; gap: 1rem; }

/* Keep single analysis plots compact (~text height); shrink-wrap & center the
   card. Wide/short figures stay full width (height cap never binds); the
   stacked result tables are excluded. */
.feature-media:not(.stacked) .figure-card { width: fit-content; max-width: 100%; margin: 0 auto; }
.feature-media:not(.stacked) .figure-card img { width: auto; max-width: 100%; max-height: 345px; height: auto; margin: 0 auto; }

.takeaway-badge {
  display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.78rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.05em; color: var(--green-dark);
  background: var(--green-soft); border-radius: 999px; padding: 0.3rem 0.8rem; margin-bottom: 1rem;
}
.takeaway-badge i { font-size: 0.9em; }

@media (max-width: 820px) {
  .feature-row { grid-template-columns: 1fr; gap: 1.5rem; }
  .feature-row.reverse .feature-body { order: 1; }
  .feature-row.reverse .feature-media { order: 2; }
}

/* ===== Gallery ===== */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; margin-top: 1.25rem; }
.gallery .figure-card { padding: 0.75rem; }
.gallery figcaption { margin-top: 0.5rem; font-size: 0.82rem; font-weight: 500; color: var(--text-2); text-align: center; }
@media (max-width: 820px) { .gallery { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .gallery { grid-template-columns: 1fr; } }

/* ===== Formula ===== */
.formula, .formula-sm {
  font-family: 'Cambria Math', Cambria, 'Times New Roman', 'Latin Modern Math', serif;
  font-style: normal; white-space: nowrap;
  background: var(--accent-soft); color: var(--accent-dark); border-radius: 6px; padding: 0.1em 0.45em;
}
.formula { font-size: 1.02em; }
.formula-sm { font-size: 0.95em; }

/* ===== Resources ===== */
.resource-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.1rem; margin-bottom: 2rem; }
@media (max-width: 820px) { .resource-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 420px) { .resource-grid { grid-template-columns: 1fr; } }
.resource-card {
  display: block; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 1.5rem; text-align: center; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s, border-color .2s;
}
.resource-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--accent-line); }
.resource-card i { font-size: 1.8rem; color: var(--accent); margin-bottom: 0.6rem; display: block; }
.resource-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 0.2rem; }
.resource-card p { font-size: 0.85rem; color: var(--text-3); }
.resource-card.disabled { opacity: 0.55; pointer-events: none; }

.content-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; box-shadow: var(--shadow-sm);
}
.content-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 0.85rem; display: flex; align-items: center; gap: 0.5rem; }
.content-card h4 i { color: var(--accent); }
.code-block {
  background: #1d1a2e; color: #e7e3f5; border-radius: 10px; padding: 1.1rem 1.25rem; overflow-x: auto;
  font-size: 0.85rem; line-height: 1.65; font-family: 'SFMono-Regular', Consolas, Menlo, monospace;
}
.code-block code { color: inherit; background: none; }

.steps { margin: 0; padding-left: 1.3rem; display: flex; flex-direction: column; gap: 0.7rem; }
.steps li { color: var(--text-2); font-size: 0.96rem; line-height: 1.65; padding-left: 0.25rem; }
.steps li::marker { color: var(--accent); font-weight: 700; }
.steps strong { color: var(--text); }
.steps a { color: var(--accent); font-weight: 600; }
.steps a:hover { text-decoration: underline; }

/* ===== BibTeX ===== */
.bibtex-block {
  background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; overflow-x: auto; font-size: 0.88rem; line-height: 1.7; color: var(--text-2);
}
.bibtex-block code { font-family: 'SFMono-Regular', Consolas, Menlo, monospace; }

/* ===== Footer ===== */
.site-footer { padding: 2.5rem 1.5rem; background: var(--bg-alt); border-top: 1px solid var(--border); text-align: center; }
.footer-icons { font-size: 1.3rem; margin-bottom: 0.75rem; }
.footer-icons a { color: var(--text-3); margin: 0 0.5rem; transition: color .2s; }
.footer-icons a:hover { color: var(--accent); }
.site-footer p { color: var(--text-3); font-size: 0.85rem; margin-top: 0.25rem; }
.site-footer p a { color: var(--text-2); text-decoration: underline; text-underline-offset: 2px; }
.site-footer p a:hover { color: var(--accent); }

/* ===================== Signal-range chart ===================== */
:root {
  --dom-emergency: #bf6733;
  --dom-daily: #5d9b3f;
  --dom-lab: #674ea7;
  --dom-operation: #2f7fb0;
}
.range-chart, .mod-panel {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.range-chart { padding: 1.75rem 1.6rem 1.5rem; }
.range-row { display: grid; grid-template-columns: 200px 1fr; gap: 1.5rem; align-items: center; margin-bottom: 1.6rem; }
.range-label h4 { font-size: 0.95rem; font-weight: 700; color: var(--text); margin-bottom: 0.15rem; }
.range-span { font-size: 0.82rem; color: var(--text-3); }
.range-track { position: relative; height: 52px; }
.range-track::before {
  content: ''; position: absolute; left: 0; right: 0; top: 50%; height: 2px;
  background: var(--border-2); border-radius: 2px;
}
.range-end { position: absolute; top: 50%; width: 2px; height: 12px; background: var(--border-2); transform: translateY(-50%); border-radius: 1px; }
.range-end.lo { left: 0; }
.range-end.hi { right: 0; }
.range-dot {
  position: absolute; top: 50%; width: 14px; height: 14px; border-radius: 50%;
  border: 2px solid #fff; box-shadow: 0 1px 3px rgba(27,23,48,.2);
  transform: translate(-50%, -50%) scale(1);
}
.range-legend { display: flex; flex-wrap: wrap; gap: 0.4rem 1.25rem; margin-top: 1.4rem; padding-top: 1.1rem; border-top: 1px solid var(--border); }
.range-legend .lg { display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.8rem; color: var(--text-2); }
.range-legend .sw { width: 11px; height: 11px; border-radius: 50%; flex: none; }
@media (max-width: 640px) {
  .range-row { grid-template-columns: 1fr; gap: 0.5rem; margin-bottom: 1.9rem; }
  .range-label { display: flex; align-items: baseline; justify-content: space-between; gap: 0.75rem; }
}

/* ===================== Modality grid ===================== */
.mod-panel { padding: 1.4rem 1.6rem 1.5rem; }
.mod-toggle { display: inline-flex; background: var(--bg-alt); border: 1px solid var(--border); border-radius: 999px; padding: 3px; margin-bottom: 1.4rem; }
.mod-tab { border: none; background: none; font: inherit; font-size: 0.85rem; font-weight: 600; color: var(--text-2); padding: 0.4rem 1.05rem; border-radius: 999px; cursor: pointer; transition: background .18s, color .18s; }
.mod-tab.active { background: #fff; color: var(--accent-dark); box-shadow: var(--shadow-sm); }
.mod-body { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0.75rem; }
@media (max-width: 820px) { .mod-body { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 480px) { .mod-body { grid-template-columns: repeat(3, 1fr); } }
.mod-item { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; padding: 0.7rem 0.3rem; border-radius: 12px; cursor: pointer; border: 1px solid transparent; transition: background .18s, border-color .18s, transform .18s; }
.mod-item:hover { background: var(--accent-soft); transform: translateY(-2px); }
.mod-item.active { background: var(--accent-soft); border-color: var(--accent-line); }
.mod-ico { width: 48px; height: 48px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.25rem; color: #fff; background: var(--accent); }
.mod-item.active .mod-ico { background: var(--accent-dark); }
.mod-name { font-size: 0.8rem; font-weight: 600; color: var(--text-2); }
.mod-group + .mod-group { margin-top: 1.4rem; }
.mod-group-title { display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; font-weight: 700; color: var(--text); margin-bottom: 0.7rem; }
.mod-group-title i { width: 22px; text-align: center; }
.mod-group-row { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0.75rem; }
@media (max-width: 820px) { .mod-group-row { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 480px) { .mod-group-row { grid-template-columns: repeat(3, 1fr); } }
.mod-detail { margin-top: 1.1rem; padding: 0.95rem 1.15rem; background: var(--bg-alt); border: 1px solid var(--border); border-radius: 12px; font-size: 0.9rem; color: var(--text-2); }
.mod-detail .md-head { display: flex; align-items: center; gap: 0.55rem; font-weight: 700; color: var(--text); margin-bottom: 0.5rem; }
.mod-detail .md-head i { color: var(--accent); }
.mod-detail .chip { display: inline-block; background: #fff; border: 1px solid var(--border-2); border-radius: 999px; padding: 0.18rem 0.65rem; margin: 0.2rem 0.25rem 0 0; font-size: 0.82rem; color: var(--text-2); }
.mod-hint { font-size: 0.8rem; color: var(--text-3); margin-top: 1rem; }
.mod-panel.picked .mod-hint { display: none; }

/* icons on labels / theme headers */
.grid-label > i { margin-right: 0.5rem; color: var(--accent); }
.theme-head > i { color: var(--accent); font-size: 0.85em; margin-left: -0.35rem; }

/* ===================== Scroll reveal ===================== */
.js-anim [data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .55s ease, transform .55s ease; }
.js-anim [data-reveal].in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js-anim [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* range-chart entrance: baseline grows, dots pop in sequentially (enhancement,
   gated on .js-anim so content is always visible without JS / reduced-motion) */
.js-anim .range-chart[data-reveal] { opacity: 1; transform: none; }
.js-anim .range-track::before { transform: scaleX(0); transform-origin: left; transition: transform .6s ease; }
.js-anim .range-chart.in .range-track::before { transform: scaleX(1); }
.js-anim .range-chart .range-dot {
  opacity: 0; transform: translate(-50%, -50%) scale(0);
  transition: opacity .4s ease, transform .5s cubic-bezier(.34, 1.56, .64, 1);
}
.js-anim .range-chart .range-dot.pop { opacity: 1; transform: translate(-50%, -50%) scale(1); }

/* ===================== Findings: click-to-reveal evidence ===================== */
.evidence-toggle {
  margin-top: 1.15rem; display: inline-flex; align-items: center; gap: 0.45rem;
  font: inherit; font-size: 0.85rem; font-weight: 600; color: var(--accent);
  background: var(--accent-soft); border: 1px solid var(--accent-line); border-radius: 999px;
  padding: 0.45rem 1.05rem; cursor: pointer; transition: background .18s, color .18s;
}
.evidence-toggle:hover { background: var(--accent); color: #fff; }
.evidence-toggle i { font-size: 0.78em; }
.feature-row.collapsible:not(.open) { display: block; }
.feature-row.collapsible:not(.open) .feature-media { display: none; }
.feature-row.collapsible.open .feature-media { animation: evidenceIn .35s ease; }
@keyframes evidenceIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .feature-row.collapsible.open .feature-media { animation: none; } }

/* ===================== Interaction polish + coverage ===================== */
:root { --cat-s2s: #2f7fb0; --cat-interp: #7c5cc4; --cat-trans: #5d9b3f; --cat-edit: #c0577f; }

/* modality tiles — more clickable */
.mod-item .mod-ico { transition: transform .2s ease, background .2s ease, box-shadow .2s ease; }
.mod-item:hover { background: var(--accent-soft); border-color: var(--accent-line); transform: translateY(-3px); box-shadow: var(--shadow); }
.mod-item:hover .mod-ico { transform: scale(1.1); box-shadow: 0 5px 14px var(--accent-glow); }
.mod-item:hover .mod-name { color: var(--accent-dark); }

/* task cards as buttons */
.task-card { cursor: pointer; }
.task-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.task-card.active { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow); }
.task-card.active .task-icon, .task-card:hover .task-icon { background: var(--accent-dark); }
.task-explore { margin-top: 0.9rem; font-size: 0.8rem; font-weight: 600; color: var(--accent); opacity: 0; transition: opacity .18s; display: inline-flex; align-items: center; gap: 0.35rem; }
.task-card:hover .task-explore, .task-card.active .task-explore { opacity: 1; }

/* findings claim = button */
.feature-body.clickable { cursor: pointer; }
.feature-body.clickable:hover .evidence-toggle { background: var(--accent); color: #fff; }
.evidence-toggle i.chev { transition: transform .2s; }
.feature-row.open .evidence-toggle i.chev { transform: rotate(180deg); }

/* coverage panel */
.coverage { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); padding: 1.4rem 1.6rem 1.5rem; }
.cov-toggle { display: inline-flex; background: var(--bg-alt); border: 1px solid var(--border); border-radius: 999px; padding: 3px; margin-bottom: 1.3rem; }
.cov-tab { border: none; background: none; font: inherit; font-size: 0.85rem; font-weight: 600; color: var(--text-2); padding: 0.4rem 1.05rem; border-radius: 999px; cursor: pointer; transition: background .18s, color .18s; }
.cov-tab.active { background: #fff; color: var(--accent-dark); box-shadow: var(--shadow-sm); }
.cov-row { border: 1px solid var(--border); border-radius: 12px; margin-bottom: 0.6rem; overflow: hidden; transition: border-color .18s; }
.cov-row:hover { border-color: var(--border-2); }
.cov-head { display: grid; grid-template-columns: 210px 1fr auto; gap: 1.1rem; align-items: center; padding: 0.85rem 1.1rem; }
.cov-head:not(.plain) { cursor: pointer; }
.cov-cat { display: flex; align-items: center; gap: 0.6rem; font-weight: 700; font-size: 0.92rem; color: var(--text); }
.cov-cat .ci { width: 30px; height: 30px; border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 0.82rem; flex: none; }
.cov-track { height: 12px; border-radius: 6px; background: var(--bg-alt); position: relative; overflow: hidden; }
.cov-track > span { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 6px; width: 0; transition: width .85s cubic-bezier(.22, 1, .36, 1); }
.cov-metawrap { display: flex; align-items: center; gap: 0.75rem; }
.cov-meta { font-size: 0.88rem; color: var(--text); font-weight: 700; text-align: right; white-space: nowrap; }
.cov-meta small { display: block; font-weight: 500; color: var(--text-3); font-size: 0.76rem; }
.cov-chev { color: var(--text-3); font-size: 0.78rem; transition: transform .2s; }
.cov-row.open .cov-chev { transform: rotate(180deg); }
.cov-body { display: none; padding: 0.1rem 1.1rem 0.9rem; }
.cov-row.open .cov-body { display: block; }
.cov-set { display: grid; grid-template-columns: 250px 1fr 92px; gap: 1.1rem; align-items: center; padding: 0.33rem 0; }
.cov-set .sn { font-size: 0.85rem; color: var(--text-2); }
.cov-sbar { height: 8px; border-radius: 4px; background: var(--bg-alt); position: relative; overflow: hidden; }
.cov-sbar > span { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 4px; opacity: .88; width: 0; transition: width .7s cubic-bezier(.22, 1, .36, 1); }
.cov-sc { font-size: 0.82rem; color: var(--text-3); text-align: right; font-variant-numeric: tabular-nums; }
.cov-hint { font-size: 0.8rem; color: var(--text-3); margin-top: 1rem; }
@media (max-width: 720px) {
  .cov-head { grid-template-columns: 1fr auto; grid-template-areas: 'cat meta' 'bar bar'; row-gap: 0.6rem; }
  .cov-cat { grid-area: cat; } .cov-metawrap { grid-area: meta; } .cov-track { grid-area: bar; }
  .cov-set { grid-template-columns: 1fr auto; grid-template-areas: 'sn sc' 'bar bar'; row-gap: 0.3rem; }
  .cov-set .sn { grid-area: sn; } .cov-sc { grid-area: sc; } .cov-sbar { grid-area: bar; }
}