/* ── The Love Equations — Shared Styles ── */

/* Design tokens (palette, radii, shadows) live in the v1.6 Synthesis Layer
   :root block further down — that layer fully supersedes the original v1.0
   tokens, so they are defined once, there. */

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

body {
  font-family: Georgia, 'Times New Roman', serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Accent bar ── */
.accent-bar { width: 100%; height: 3px; background: var(--scarlet); flex-shrink: 0; }

/* ── Nav ── */
.nav {
  background: var(--bg);
  border-bottom: 0.5px solid var(--border);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  flex-shrink: 0;
}
.nav-logo {
  font-size: 16px;
  color: var(--text);
  letter-spacing: 0.05em;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-logo span { color: var(--scarlet); }
.nav-links { display: flex; }
.nav-link {
  font-size: 10px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 0 13px;
  height: 56px;
  display: flex;
  align-items: center;
  border-bottom: 2px solid transparent;
  text-decoration: none;
  transition: color 0.15s;
  white-space: nowrap;
}
.nav-link:hover { color: var(--scarlet); }
.nav-link.active { color: var(--scarlet); border-bottom-color: var(--scarlet); }

/* ── Footer ── */
.footer {
  background: var(--footer-bg);
  padding: 1.75rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  margin-top: auto;
}
.footer-logo { font-size: 13px; color: #4A3030; letter-spacing: 0.05em; }
.footer-logo span { color: #8A3040; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px 24px; }
.footer-link { font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: #3A2020; text-decoration: none; }
.footer-link:hover { color: #6A4040; }
.footer-copy { font-size: 10px; color: #2A1818; letter-spacing: 0.04em; }

/* ── Page wrapper ── */
.page { flex: 1; }

/* ── Hero ── */
.hero {
  background: var(--surface);
  border-bottom: 0.5px solid var(--border);
  padding: 4rem 2.5rem 3.5rem;
  text-align: center;
}
.hero-eyebrow {
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--scarlet);
  margin-bottom: 1.25rem;
}
.hero-title {
  font-size: 44px;
  color: var(--text);
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}
.hero-title em { color: var(--scarlet); font-style: italic; }
.hero-divider {
  width: 40px;
  height: 1px;
  background: var(--scarlet);
  margin: 0 auto 1.5rem;
}
.hero-sub {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 480px;
  margin: 0 auto 2rem;
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--scarlet);
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background 0.15s;
}
.hero-cta:hover { background: var(--scarlet-dim); }

/* ── Page header (non-home pages) ── */
.page-header {
  background: var(--surface);
  border-bottom: 0.5px solid var(--border);
  padding: 2.5rem 2rem 2rem;
}
.page-eyebrow {
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--scarlet);
  margin-bottom: 8px;
}
.page-title {
  font-size: 32px;
  color: var(--text);
  margin-bottom: 10px;
}
.page-sub {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 580px;
}

/* ── Content area ── */
.content { padding: 2.5rem 2rem; max-width: 860px; }

/* ── Section label ── */
.section-label {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1rem;
  padding-bottom: 8px;
  border-bottom: 0.5px solid var(--border);
}

/* ── Cards ── */
.card {
  background: var(--card);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}
.card + .card { margin-top: 10px; }

/* ── Grid ── */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--border);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--border);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.grid-cell {
  background: var(--card);
  padding: 1.35rem 1.25rem;
  cursor: pointer;
  transition: background 0.15s;
}
.grid-cell:hover { background: var(--surface); }

/* ── Badges / pills ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--scarlet);
  border: 0.5px solid var(--border);
  padding: 3px 9px;
  border-radius: var(--radius-sm);
}

/* ── Tabs / switcher ── */
.tab-nav {
  display: flex;
  gap: 8px;
  margin-bottom: 1.75rem;
}
.tab-btn {
  flex: 1;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-md);
  border: 0.5px solid var(--border);
  background: var(--card);
  cursor: pointer;
  font-family: Georgia, serif;
  font-size: 13px;
  color: var(--text-muted);
  transition: all 0.15s;
  text-align: center;
}
.tab-btn:hover { color: var(--text); border-color: var(--text-dim); }
.tab-btn.active {
  background: var(--scarlet-pale);
  color: var(--scarlet-dim);
  border-color: #E0A0A8;
}

/* ── Collapsible sections ── */
.dos-card {
  background: var(--card);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 10px;
}
.dos-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.1rem;
  cursor: pointer;
}
.dos-head:hover { background: var(--surface); }
.dos-head-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 400;
  color: var(--text);
}
.dos-chev {
  font-size: 14px;
  color: var(--text-dim);
  transition: transform 0.2s;
}
.dos-chev.open { transform: rotate(180deg); }
.dos-body {
  display: none;
  padding: 0.25rem 1.1rem 1rem;
  border-top: 0.5px solid var(--border);
}
.dos-body.open { display: block; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  border: 0.5px solid var(--border);
  background: var(--card);
  cursor: pointer;
  font-family: Georgia, serif;
  font-size: 14px;
  color: var(--text);
  transition: all 0.12s;
  text-decoration: none;
}
.btn:hover { background: var(--surface); }
.btn-scarlet {
  background: var(--scarlet);
  color: var(--bg);
  border-color: var(--scarlet);
}
.btn-scarlet:hover { background: var(--scarlet-dim); }

/* ── Sliders ── */
input[type=range] {
  width: 100%;
  accent-color: var(--scarlet);
}

/* ── Utility ── */
.mt-1 { margin-top: 0.75rem; }
.mt-2 { margin-top: 1.25rem; }
.mt-3 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.75rem; }
.mb-2 { margin-bottom: 1.25rem; }
.mb-3 { margin-bottom: 2rem; }


/* ─────────────────────────────────────────────
   v1.6 Synthesis Layer
   v1.4-style UI polish + Claude cream/scarlet palette
   ───────────────────────────────────────────── */

:root {
  --bg: #fbf6ef;
  --surface: #f3e6d8;
  --card: rgba(255, 252, 247, 0.92);
  --card-solid: #fffdf9;
  --border: rgba(116, 79, 61, 0.18);
  --border-light: rgba(116, 79, 61, 0.11);
  --scarlet: #c41e3a;
  --scarlet-dim: #8f1427;
  --scarlet-deep: #67101d;
  --scarlet-pale: #fae6e8;
  --gold: #b7772f;
  --text: #1a0e0e;
  --text-muted: #71594d;
  --text-dim: #a58b7b;
  --footer-bg: #1a0e0e;
  --shadow: 0 24px 70px rgba(82, 43, 29, 0.16);
  --shadow-soft: 0 14px 40px rgba(82, 43, 29, 0.10);
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --container: 1120px;
}

html { scroll-behavior: smooth; }

body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 6% 0%, rgba(196, 30, 58, 0.11), transparent 30rem),
    radial-gradient(circle at 96% 4%, rgba(183, 119, 47, 0.12), transparent 26rem),
    linear-gradient(180deg, #fbf6ef 0%, #f7eee4 100%);
  color: var(--text);
  line-height: 1.65;
}

.accent-bar {
  height: 4px;
  background: linear-gradient(90deg, var(--scarlet-deep), var(--scarlet), #d66a33, var(--scarlet));
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  height: auto;
  min-height: 76px;
  padding: 0 2rem;
  background: rgba(251, 246, 239, 0.88);
  backdrop-filter: blur(18px);
  box-shadow: 0 10px 40px rgba(82, 43, 29, 0.05);
}

.nav-logo {
  font-family: "Playfair Display", Georgia, "Times New Roman", serif;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  line-height: 1;
}

.nav-links {
  align-items: center;
  gap: 0.15rem;
  min-width: 0;
}

.nav-link {
  height: 76px;
  padding: 0 8px;
  border-bottom-width: 2px;
  color: var(--text-muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.015em;
  text-transform: none;
}

.nav-link:hover,
.nav-link.active {
  color: var(--scarlet);
}

/* Hamburger toggle — hidden on desktop, shown at the mobile breakpoint */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: rgba(255, 252, 247, 0.6);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
}
.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.22s ease, opacity 0.18s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(255, 252, 247, 0.72), rgba(250, 230, 232, 0.58)),
    var(--surface);
  padding: 6.5rem 2rem 5.75rem;
}

.hero::after {
  content: "";
  position: absolute;
  width: 34rem;
  aspect-ratio: 1;
  right: -12rem;
  top: -14rem;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(196, 30, 58, 0.17), transparent 65%);
  pointer-events: none;
}

.hero-title,
.page-title {
  font-family: "Playfair Display", Georgia, serif;
  letter-spacing: -0.045em;
}

.hero-title {
  font-size: clamp(3.6rem, 8vw, 7rem);
  line-height: 0.9;
}

.hero-title em {
  color: var(--scarlet);
}

.hero-sub {
  max-width: 620px;
  font-size: 1.08rem;
}

.hero-cta,
.btn {
  border-radius: 999px;
  box-shadow: 0 14px 34px rgba(196, 30, 58, 0.18);
  font-weight: 850;
}

.hero-cta:hover,
.btn:hover {
  transform: translateY(-2px);
}

.page-header {
  padding: 4rem 2rem 3rem;
  background:
    linear-gradient(135deg, rgba(255, 252, 247, 0.78), rgba(250, 230, 232, 0.55)),
    var(--surface);
}

.page-header > * {
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
}

.page-title {
  font-size: clamp(2.4rem, 5.4vw, 4.4rem);
  line-height: 0.98;
}

.page-sub {
  max-width: 760px;
  font-size: 1rem;
}

.content,
.sections-area {
  max-width: var(--container);
  margin-inline: auto;
}

.card,
.grid-3,
.grid-2,
.dos-card,
.mechanism-box,
.inv-box,
.qlink,
.factor-card,
.rule-box,
.profile-card,
.calc-shell,
.smv-card,
.result-box,
.assessment-panel {
  border-color: var(--border) !important;
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-soft);
}

.card,
.grid-cell,
.dos-card,
.factor-card,
.qlink,
.assessment-panel,
.result-box,
.smv-card {
  background: linear-gradient(145deg, rgba(255,255,255,0.88), rgba(255, 250, 243, 0.72)) !important;
}

.grid-3,
.grid-2 {
  gap: 1rem !important;
  background: transparent !important;
  border: 0 !important;
  overflow: visible !important;
}

.grid-cell {
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease, background 160ms ease;
}

.grid-cell:hover,
.qlink:hover,
.smv-card:hover {
  transform: translateY(-2px);
  border-color: rgba(196, 30, 58, 0.38) !important;
  box-shadow: var(--shadow);
}

.badge {
  border-radius: 999px;
  background: var(--scarlet-pale);
  color: var(--scarlet-dim);
  border: 0.5px solid rgba(196, 30, 58, 0.18);
}

.tab-nav {
  background: rgba(255, 252, 247, 0.55);
  border: 0.5px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem;
  display: inline-flex;
  gap: 0.35rem;
  margin-bottom: 1.75rem;
  box-shadow: var(--shadow-soft);
}

.tab-btn {
  border-radius: 999px;
  border: 0.5px solid transparent;
  padding: 0.72rem 1rem;
  background: transparent;
  color: var(--text-muted);
  font-weight: 800;
  cursor: pointer;
}

.tab-btn.land-active,
.tab-btn.male-active,
.tab-btn.fem-active,
.tab-btn.active {
  background: var(--scarlet);
  color: #fffaf3;
  border-color: var(--scarlet);
}

.dos-head,
.mech-header,
.inv-header,
.section-label {
  letter-spacing: 0.12em;
  font-weight: 850;
}

.dos-body p,
.mech-text,
.inv-note,
.sc-desc,
.factor-sub,
.rule-box,
.page-sub,
.hero-sub {
  line-height: 1.75;
}

.footer {
  background:
    radial-gradient(circle at 10% 0%, rgba(196, 30, 58, 0.24), transparent 22rem),
    var(--footer-bg);
  color: #f7eadc;
}

.footer-logo,
.footer-logo span,
.footer-link,
.footer-copy {
  color: #f7eadc;
}

.footer-link:hover {
  color: #ff9aad;
}

/* v1.4 hierarchy diagram, recolored into cream/scarlet */
.hierarchy-synthesis-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
  gap: 2.5rem;
  align-items: center;
  margin-bottom: 3rem;
}

.hierarchy-intro-card {
  background: linear-gradient(145deg, rgba(255,255,255,0.88), rgba(250,230,232,0.48));
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-soft);
}

.hierarchy-intro-card h2 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(2rem, 4.3vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.04em;
  margin-bottom: 1rem;
}

.hierarchy-intro-card p {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.pyramid-stage {
  width: min(100%, 650px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
}

.pyramid-tier {
  position: relative;
  padding: 1.25rem 1.6rem 1.4rem;
  text-align: center;
  border: 0.5px solid var(--border);
  color: var(--text);
  box-shadow: var(--shadow);
  clip-path: polygon(12% 0, 88% 0, 100% 100%, 0 100%);
}

.pyramid-primary {
  width: 62%;
  background: linear-gradient(145deg, var(--scarlet), var(--scarlet-dim));
  color: #fffaf3;
}

.pyramid-secondary {
  width: 80%;
  background: linear-gradient(145deg, var(--scarlet-pale), rgba(255,255,255,0.76));
}

.pyramid-tertiary {
  width: 100%;
  background: linear-gradient(145deg, var(--card-solid), var(--surface));
}

.pyramid-tier h3 {
  font-size: 1.2rem;
  margin-bottom: 0.35rem;
}

.pyramid-tier p {
  margin: 0;
  font-size: 0.88rem;
  color: currentColor;
  opacity: 0.78;
}

.pyramid-kicker {
  display: inline-block;
  margin-bottom: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  color: var(--gold);
  font-weight: 900;
}

.pyramid-primary .pyramid-kicker { color: #ffd7b0; }

/* Pill dossier synthesis copy */
.dossier-note {
  background: var(--card-solid);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  margin-top: 1rem;
  color: var(--text-muted);
  box-shadow: var(--shadow-soft);
}

.dossier-note strong { color: var(--text); }

/* ── Mobile navigation: collapsible hamburger ── */
@media (max-width: 1024px) {
  .nav {
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
    padding: 0 1.25rem;
  }

  .nav-toggle { display: inline-flex; }

  .nav-links {
    display: none;
    order: 3;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0;
    margin: 0 -1.25rem;
    padding: 0.35rem 1.25rem 0.85rem;
    border-top: 0.5px solid var(--border);
    overflow: visible;
  }

  .nav-links.open { display: flex; }

  .nav-link {
    height: auto;
    width: 100%;
    padding: 0.8rem 0.25rem;
    font-size: 15px;
    border-bottom: 0.5px solid var(--border-light);
  }

  .nav-link:last-child { border-bottom: 0; }

  .nav-link.active {
    border-bottom-color: var(--border-light);
    color: var(--scarlet);
  }
}

@media (max-width: 980px) {
  .hierarchy-synthesis-grid {
    grid-template-columns: 1fr;
  }

  .grid-3,
  .grid-2,
  .factors-row,
  .inv-grid,
  .quick-links {
    grid-template-columns: 1fr !important;
  }

  .inv-col + .inv-col {
    border-left: 0 !important;
    border-top: 0.5px solid var(--border);
  }
}

@media (max-width: 720px) {
  .hero,
  .page-header,
  .content,
  .sections-area {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .pyramid-primary,
  .pyramid-secondary,
  .pyramid-tertiary {
    width: 100%;
    clip-path: none;
    border-radius: var(--radius-lg);
  }

  .tab-nav {
    display: flex;
    width: 100%;
    border-radius: var(--radius-lg);
    flex-wrap: wrap;
  }
}

/* ── Footer: stack on smaller screens ── */
@media (max-width: 720px) {
  .footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.1rem;
    padding: 1.75rem 1.25rem;
    text-align: left;
  }

  .footer-links {
    gap: 12px 20px;
  }
}

/* ── On-page table of contents (frameworks, statistics) ── */
.smv-sub,
.chart-card,
.dos-section { scroll-margin-top: 96px; }

.page-toc {
  max-width: var(--container);
  margin: 1.6rem auto 0.4rem;
  background: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(255,250,243,0.74));
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: 1.2rem 1.4rem 1.3rem;
}
.page-toc-head {
  display: flex; align-items: center; gap: 8px;
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  font-weight: 850; color: var(--text-dim);
  cursor: pointer; list-style: none;
}
.page-toc-head::-webkit-details-marker { display: none; }
.page-toc-head:hover { color: var(--text); }
.page-toc-head i { color: var(--scarlet); font-size: 15px; }
.page-toc-head .toc-chevron { margin-left: auto; color: var(--text-dim); font-size: 16px; transition: transform 0.22s ease; }
.page-toc[open] .toc-chevron { transform: rotate(180deg); }
.toc-groups { display: none; }
.page-toc[open] .toc-groups { display: flex; flex-wrap: wrap; gap: 1.25rem 2.5rem; margin-top: 1rem; }
.toc-group { flex: 1 1 250px; min-width: 0; }
.toc-group-label {
  font-size: 10.5px; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-dim);
  padding-bottom: 0.42rem; margin-bottom: 0.5rem;
  border-bottom: 0.5px solid var(--border);
}
.toc-entry {
  display: flex; align-items: baseline; gap: 9px;
  text-decoration: none; color: var(--text-muted);
  font-size: 13px; line-height: 1.5; padding: 3.5px 0;
  transition: color 140ms ease;
}
.toc-entry:hover,
.toc-entry:hover .toc-num { color: var(--scarlet); }
.toc-num {
  flex-shrink: 0; min-width: 1.5em; text-align: right;
  color: var(--scarlet-dim); font-weight: 800; font-size: 12px;
  font-variant-numeric: tabular-nums;
}
.toc-entry.sub { padding-left: 1.35rem; font-size: 12.5px; }
.toc-entry.sub .toc-num { min-width: 2em; color: var(--text-dim); font-weight: 700; }

/* ── Back-to-top floating button (injected on long pages) ── */
.back-to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  background: var(--scarlet); color: #fffaf3;
  border: none; border-radius: 999px;
  box-shadow: 0 10px 26px rgba(196,30,58,0.34);
  cursor: pointer; font-size: 20px;
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s, background 0.2s ease;
  z-index: 30;
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--scarlet-dim); transform: translateY(-2px); }
.back-to-top:focus-visible { outline: 2px solid var(--scarlet-dim); outline-offset: 3px; }
@media (max-width: 720px) {
  .back-to-top { width: 42px; height: 42px; font-size: 18px; }
}

/* ===== Face × Body composite ("Overall looks rating") ===== */
.composite-section { max-width: var(--container); margin: 0 auto; padding: 2.4rem 2rem 2.8rem; }
.composite-lens { display: flex; gap: 6px; max-width: 340px; margin: 0 auto 1rem; }
.composite-lensbtn {
  flex: 1; border: 0.5px solid var(--border); background: rgba(255,255,255,0.6); border-radius: 9px;
  padding: 8px 10px; font-family: inherit; font-size: 12.5px; font-weight: 600; color: var(--text-muted);
  cursor: pointer; transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.composite-lensbtn[data-lens="blackpill"].active { background: #51606F; color: #fff; border-color: #51606F; }
.composite-lensbtn[data-lens="conventional"].active { background: #0F6E56; color: #fff; border-color: #0F6E56; }
.composite-panel {
  border: 0.5px solid var(--border); border-radius: var(--radius-lg);
  background: linear-gradient(145deg, rgba(255,255,255,0.92), rgba(255,250,243,0.74));
  box-shadow: var(--shadow-soft); padding: clamp(1.2rem, 3.5vw, 1.9rem);
}
.composite-head { text-align: center; margin-bottom: 1.1rem; }
.composite-title {
  font-family: "Playfair Display", Georgia, serif; font-size: clamp(1.7rem, 4vw, 2.2rem);
  line-height: 1.04; letter-spacing: -0.03em; color: var(--text); margin: 0.15rem 0 0.4rem;
}
.composite-lead { font-size: 12.5px; color: var(--text-muted); line-height: 1.55; max-width: 48ch; margin: 0 auto; }
.composite-score-wrap { text-align: center; padding: 0.6rem 0 0.2rem; }
.composite-score { font-family: "Playfair Display", Georgia, serif; font-size: clamp(3rem, 11vw, 4.6rem); line-height: 0.9; }
.composite-score .unit { font-size: 0.34em; color: var(--text-dim); letter-spacing: 0.04em; }
.composite-tier { font-size: 14px; font-weight: 700; letter-spacing: 0.02em; margin-top: 0.3rem; }
.composite-srcbadge {
  display: inline-block; margin-top: 0.7rem; font-size: 11px; font-weight: 700; letter-spacing: 0.04em;
  text-transform: uppercase; color: #51606F; background: #eef1f4; border-radius: 999px; padding: 0.32rem 0.8rem;
}
.composite-other { font-size: 12.5px; color: var(--text-muted); margin-top: 0.7rem; }
.composite-breakdown { font-size: 12.5px; color: var(--text-muted); margin-top: 0.35rem; }
.composite-note {
  font-size: 11.5px; color: var(--text-dim); line-height: 1.55; margin-top: 1.1rem;
  border-top: 0.5px solid var(--border-light); padding-top: 0.8rem;
}
.composite-foot { margin-top: 1rem; text-align: center; }
.composite-foot button {
  font: inherit; font-size: 12px; font-weight: 700; color: var(--scarlet-dim); background: none;
  border: 0.5px solid var(--border); border-radius: 999px; padding: 0.4rem 1rem; cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease;
}
.composite-foot button:hover { background: var(--scarlet-pale); border-color: rgba(196,30,58,0.3); }
.composite-empty { text-align: center; color: var(--text-dim); padding: 1rem 1rem 0.4rem; }
.composite-empty > i { font-size: 30px; display: block; margin-bottom: 0.5rem; color: var(--border); }
.composite-empty-lead { font-size: 13px; color: var(--text-muted); line-height: 1.6; max-width: 44ch; margin: 0 auto 0.9rem; }
.composite-rows { display: inline-flex; flex-direction: column; gap: 0.45rem; text-align: left; margin: 0 auto; }
.composite-row { font-size: 13px; display: flex; align-items: center; gap: 0.5rem; }
.composite-row i { font-size: 16px; }
.composite-row.done { color: var(--text-muted); }
.composite-row.done i { color: #0F6E56; }
.composite-row.todo a { color: var(--scarlet-dim); font-weight: 600; text-decoration: none; }
.composite-row.todo a:hover { text-decoration: underline; }
.composite-row.todo i { color: var(--text-dim); }
@media (max-width: 880px) { .composite-section { padding: 1.6rem 1rem 2.2rem; } }