/* =====================================================================
   PeptideDosing — modern tech design system (dark bio-tech)
   Single source of truth. Every page links this stylesheet.
   ===================================================================== */

/* ---------- Tokens ---------- */
:root {
  --bg:           #07080a;
  --bg-grid:      rgba(255,255,255,0.025);
  --surface:      #0d1015;
  --surface-2:    #131821;
  --surface-3:    #1a2030;
  --hairline:     rgba(255,255,255,0.06);
  --hairline-2:   rgba(255,255,255,0.10);
  --hairline-3:   rgba(255,255,255,0.16);

  --ink:          #e8ecf2;
  --ink-soft:     #9ba3b1;
  --ink-mute:     #6b7385;
  --ink-faint:    #4a5260;

  --accent:       #5cf2a3;
  --accent-soft:  rgba(92,242,163,0.12);
  --accent-deep:  #1a3b2a;
  --accent-2:     #5eead4;
  --accent-glow:  rgba(92,242,163,0.45);
  --warn:         #fbbf24;
  --warn-soft:    rgba(251,191,36,0.10);
  --danger:       #f87171;

  --sans: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 22px;

  --shadow-sm: 0 1px 0 rgba(255,255,255,0.04) inset, 0 4px 24px rgba(0,0,0,0.35);
  --shadow-md: 0 1px 0 rgba(255,255,255,0.04) inset, 0 12px 40px rgba(0,0,0,0.45);
  --shadow-glow: 0 0 0 1px rgba(92,242,163,0.25), 0 12px 40px rgba(92,242,163,0.12);

  /* legacy aliases — any inline styles in original pages still resolve correctly */
  --border:        var(--hairline);
  --accent-light:  var(--accent-soft);
  --accent-warm:   var(--accent-2);
  --serif:         var(--sans);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-feature-settings: 'ss01', 'cv11';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  position: relative;
}
body::before {
  content: '';
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(900px 500px at 12% -10%, rgba(92,242,163,0.10), transparent 60%),
    radial-gradient(700px 400px at 95% 8%, rgba(94,234,212,0.06), transparent 60%),
    var(--bg);
  pointer-events: none;
}
body::after {
  content: '';
  position: fixed; inset: 0; z-index: -1;
  background-image:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 80%);
          mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 80%);
  pointer-events: none;
  opacity: 0.7;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
::selection { background: var(--accent); color: #07080a; }

/* ---------- Type ---------- */
h1, h2, h3, h4, h5 {
  font-family: var(--sans); color: var(--ink);
  letter-spacing: -0.02em; line-height: 1.15; font-weight: 600;
}
h1 { font-size: clamp(2.4rem, 5.2vw, 4.4rem); letter-spacing: -0.035em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); letter-spacing: -0.025em; }
h3 { font-size: 1.05rem; }
h4 { font-size: 0.85rem; }
p  { font-size: 0.95rem; color: var(--ink-soft); line-height: 1.7; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono);
  font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent);
  padding: 6px 12px;
  background: var(--accent-soft);
  border: 1px solid rgba(92,242,163,0.18);
  border-radius: 99px;
}
.eyebrow::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 10px var(--accent-glow);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.45} }

.section-label {
  font-family: var(--mono);
  font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--accent);
}
.accent { color: var(--accent); }
.mono   { font-family: var(--mono); }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(7,8,10,0.72);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
          backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--hairline);
}
.nav-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 0 28px;
  height: 60px;
  display: flex; align-items: center; gap: 36px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; margin-right: auto; color: var(--ink); }
.nav-logo-mark {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  color: var(--accent);
  position: relative;
  flex-shrink: 0;
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}
.nav-logo-mark::before {
  content: '';
  position: absolute; inset: -3px;
  background: radial-gradient(circle, rgba(92,242,163,0.32), transparent 65%);
  filter: blur(5px);
  z-index: -1;
  opacity: 0.7;
  transition: opacity 0.25s;
}
.nav-logo-mark svg { width: 100%; height: 100%; display: block; overflow: visible; }
.nav-logo-mark svg .pd-node-active { filter: drop-shadow(0 0 4px rgba(92,242,163,0.7)); }
.nav-logo:hover .nav-logo-mark { transform: rotate(-6deg); }
.nav-logo:hover .nav-logo-mark::before { opacity: 1; }

.nav-logo-text {
  font-family: var(--sans); font-size: 0.96rem; font-weight: 600;
  letter-spacing: -0.022em;
  white-space: nowrap;
}
.nav-logo-text .dim { color: var(--ink-soft); font-weight: 500; }
.nav-link { font-size: 0.86rem; color: var(--ink-soft); font-weight: 500; transition: color 0.15s ease; }
.nav-link:hover { color: var(--ink); }
.nav-cta {
  font-size: 0.84rem; font-weight: 600;
  background: var(--ink); color: var(--bg);
  padding: 8px 16px; border-radius: 8px;
  border: 1px solid var(--hairline-3);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.nav-cta:hover { transform: translateY(-1px); }

/* ---------- Disclaimer ---------- */
.disclaimer-banner {
  background: rgba(251,191,36,0.06);
  border-bottom: 1px solid rgba(251,191,36,0.18);
  padding: 10px 28px;
  font-size: 0.78rem;
  color: #d6a82a;
  text-align: center;
  font-family: var(--sans);
}
.disclaimer-banner strong { color: var(--warn); font-weight: 600; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--sans); font-size: 0.9rem; font-weight: 600;
  padding: 11px 20px; border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  white-space: nowrap; text-decoration: none;
}
.btn-primary {
  background: var(--accent); color: #07080a;
  box-shadow: 0 0 0 1px rgba(92,242,163,0.45), 0 6px 24px rgba(92,242,163,0.18);
}
.btn-primary:hover { transform: translateY(-1px); background: #6cf6ad; }
.btn-ghost {
  background: transparent; color: var(--ink);
  border-color: var(--hairline-3);
}
.btn-ghost:hover { background: var(--surface-2); }
.btn-block { width: 100%; justify-content: center; padding: 13px 18px; }

.arrow { display: inline-block; transition: transform 0.2s ease; }
a:hover .arrow, .btn:hover .arrow { transform: translateX(3px); }

/* ---------- Containers ---------- */
.container { max-width: 1280px; margin: 0 auto; padding: 0 28px; }
.section   { padding: 96px 28px; max-width: 1280px; margin: 0 auto; }
.section-tight { padding: 72px 28px; max-width: 1280px; margin: 0 auto; }
.section-header { margin-bottom: 56px; max-width: 720px; }
.section-header .section-label { display: block; margin-bottom: 14px; }
.section-header h2 { margin-bottom: 14px; }
.section-header p  { font-size: 1rem; color: var(--ink-soft); }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 88px 28px 72px; max-width: 1280px; margin: 0 auto; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 72px; align-items: center; }
.hero h1 { margin: 18px 0 22px; }
.hero h1 .grad {
  background: linear-gradient(120deg, #5cf2a3 0%, #5eead4 100%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.hero p.lede { font-size: 1.05rem; color: var(--ink-soft); max-width: 540px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }

/* Hero search */
.hero-search {
  position: relative;
  margin-top: 26px;
  max-width: 520px;
}
.hero-search input {
  width: 100%;
  padding: 14px 56px 14px 44px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--hairline-2);
  border-radius: 12px;
  color: var(--ink);
  font-family: var(--sans); font-size: 0.95rem;
  outline: none;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
}
.hero-search input::placeholder { color: var(--ink-mute); }
.hero-search input:focus {
  border-color: var(--accent);
  background: rgba(92,242,163,0.04);
  box-shadow: 0 0 0 4px rgba(92,242,163,0.08);
}
.hero-search .search-icon {
  position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
  width: 18px; height: 18px; color: var(--ink-mute);
  pointer-events: none;
  transition: color 0.15s;
}
.hero-search input:focus + .search-kbd, .hero-search input:focus ~ .search-icon { color: var(--accent); }
.hero-search .search-icon svg { width: 100%; height: 100%; }
.hero-search .search-kbd {
  position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
  font-family: var(--mono); font-size: 0.74rem; color: var(--ink-mute);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--hairline-2);
  border-radius: 4px;
  padding: 2px 7px;
  pointer-events: none;
}
.hero-search .search-results {
  position: absolute; left: 0; right: 0; top: calc(100% + 8px);
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--hairline-2);
  border-radius: 12px;
  padding: 6px;
  display: none;
  max-height: 360px; overflow-y: auto;
  z-index: 50;
  box-shadow: var(--shadow-md);
}
.hero-search .search-results.show { display: block; }
.hero-search .sr-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.9rem; color: var(--ink);
  transition: background 0.12s, color 0.12s;
}
.hero-search .sr-item::after {
  content: '↗';
  font-family: var(--mono); font-size: 0.78rem; color: var(--ink-mute);
  transition: color 0.12s, transform 0.12s;
}
.hero-search .sr-item:hover, .hero-search .sr-item.active {
  background: var(--accent-soft); color: var(--accent);
}
.hero-search .sr-item:hover::after, .hero-search .sr-item.active::after {
  color: var(--accent); transform: translateX(2px);
}
.hero-search .sr-none {
  padding: 14px 12px;
  font-family: var(--mono); font-size: 0.84rem; color: var(--ink-mute);
  text-align: center;
}

.data-card {
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--hairline);
  border-radius: var(--r-xl);
  padding: 22px;
  box-shadow: var(--shadow-md);
  position: relative; overflow: hidden;
}
.data-card::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(420px 240px at 100% 0%, rgba(92,242,163,0.10), transparent 60%);
  pointer-events: none;
}
.data-card-header {
  display: flex; align-items: center; justify-content: space-between;
  font-family: var(--mono); font-size: 0.72rem; color: var(--ink-mute);
  letter-spacing: 0.12em; text-transform: uppercase;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--hairline-2);
  margin-bottom: 18px;
}
.data-card-header .live {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--accent);
}
.data-card-header .live::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow); animation: pulse 2.4s ease-in-out infinite;
}
.stat-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 10px; }
.stat-cell {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 16px 18px;
  position: relative; overflow: hidden;
}
.stat-cell .num {
  font-family: var(--mono); font-size: 1.8rem; font-weight: 500; color: var(--ink);
  letter-spacing: -0.02em; line-height: 1;
}
.stat-cell .num.accent { color: var(--accent); }
.stat-cell .label {
  font-size: 0.74rem; color: var(--ink-mute); margin-top: 6px;
  font-family: var(--mono); letter-spacing: 0.04em;
}
.trust-strip { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.chip {
  font-family: var(--mono); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.06em;
  color: var(--ink-soft);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--hairline);
  padding: 5px 10px; border-radius: 6px;
}
.chip.on { color: var(--accent); border-color: rgba(92,242,163,0.22); background: var(--accent-soft); }

/* ---------- Cards ---------- */
.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  position: relative;
  background: linear-gradient(180deg, var(--surface) 0%, rgba(13,16,21,0.65) 100%);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: 26px 24px;
  color: var(--ink);
  display: flex; flex-direction: column;
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
  overflow: hidden;
}
.card::before {
  content: ''; position: absolute; left: 0; right: 0; top: 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(92,242,163,0.0), transparent);
  transition: background 0.2s ease;
}
.card:hover {
  border-color: var(--hairline-3);
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(92,242,163,0.18);
}
.card:hover::before { background: linear-gradient(90deg, transparent, rgba(92,242,163,0.6), transparent); }

.card-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 0.68rem; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.card-tag::before { content: ''; width: 14px; height: 1px; background: var(--accent); }

.card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; letter-spacing: -0.015em; }
.card p { font-size: 0.88rem; color: var(--ink-soft); margin-bottom: 18px; line-height: 1.6; flex: 1; }

.meta-rows {
  display: flex; flex-direction: column; gap: 6px;
  border-top: 1px dashed var(--hairline-2);
  padding-top: 14px; margin-top: 4px;
}
.meta-row {
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--mono); font-size: 0.78rem;
}
.meta-row .k { color: var(--ink-mute); letter-spacing: 0.04em; }
.meta-row .v { color: var(--ink); }

.card-foot {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 18px;
  font-family: var(--mono); font-size: 0.78rem; color: var(--accent);
  letter-spacing: 0.04em;
}

/* ---------- Categories ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.cat-card {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: 22px;
  color: var(--ink);
  transition: border-color 0.15s, transform 0.15s, background 0.15s;
  display: flex; flex-direction: column; gap: 10px;
  height: 100%;
}
.cat-card:hover { border-color: var(--hairline-3); transform: translateY(-2px); background: var(--surface-2); }
.cat-icon {
  width: 36px; height: 36px; display: grid; place-items: center;
  border-radius: 10px;
  background: var(--accent-soft);
  border: 1px solid rgba(92,242,163,0.18);
  color: var(--accent);
}
.cat-icon svg { width: 18px; height: 18px; stroke: var(--accent); fill: none; stroke-width: 1.6; }
.cat-card h3 { font-size: 1rem; font-weight: 600; }
.cat-card p { font-size: 0.83rem; color: var(--ink-soft); line-height: 1.55; flex: 1; }
.cat-count {
  font-family: var(--mono); font-size: 0.74rem; color: var(--accent);
  display: inline-flex; align-items: center; gap: 6px; margin-top: 6px;
}

/* ---------- Feature band ---------- */
.feature-band {
  position: relative;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background:
    radial-gradient(700px 300px at 80% 30%, rgba(92,242,163,0.05), transparent 60%),
    radial-gradient(500px 260px at 10% 80%, rgba(94,234,212,0.04), transparent 60%);
}
.feature-grid {
  max-width: 1280px; margin: 0 auto;
  padding: 96px 28px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center;
}
.feature-points { display: flex; flex-direction: column; gap: 14px; }
.feature-point {
  display: grid; grid-template-columns: 38px 1fr; gap: 14px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
}
.feature-point .ico {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--accent-soft);
  border: 1px solid rgba(92,242,163,0.2);
  display: grid; place-items: center;
}
.feature-point .ico svg { width: 16px; height: 16px; stroke: var(--accent); fill: none; stroke-width: 1.7; }
.feature-point h4 { font-size: 0.95rem; font-weight: 600; color: var(--ink); margin-bottom: 4px; }
.feature-point p { font-size: 0.85rem; color: var(--ink-soft); line-height: 1.6; }

/* ---------- Calculator ---------- */
.calc-section {
  padding: 88px 28px;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background: radial-gradient(700px 320px at 50% 0%, rgba(92,242,163,0.05), transparent 60%);
}
.calc-inner { max-width: 880px; margin: 0 auto; text-align: center; }
.calc-inner h2 { margin: 14px 0 10px; }
.calc-inner > p { color: var(--ink-soft); margin-bottom: 32px; }

.calc-box {
  background: linear-gradient(180deg, var(--surface) 0%, rgba(13,16,21,0.6) 100%);
  border: 1px solid var(--hairline-2);
  border-radius: var(--r-lg);
  padding: 28px;
  text-align: left;
  box-shadow: var(--shadow-md);
}
.calc-fields { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; margin-bottom: 14px; }
.field label {
  display: block; font-family: var(--mono); font-size: 0.7rem; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 8px;
}
.field input, .field select, .input, .select {
  width: 100%; padding: 11px 12px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--hairline-2);
  border-radius: 8px;
  color: var(--ink);
  font-family: var(--mono); font-size: 0.92rem;
  outline: none;
  transition: border-color 0.15s, background 0.15s;
}
.field input:focus, .field select:focus, .input:focus, .select:focus {
  border-color: var(--accent);
  background: rgba(92,242,163,0.04);
}
.field select, .select {
  appearance: none; -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-soft) 50%), linear-gradient(135deg, var(--ink-soft) 50%, transparent 50%);
  background-position: calc(100% - 18px) 55%, calc(100% - 13px) 55%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 32px;
}
.field-stack { display: flex; flex-direction: column; gap: 6px; }
.calc-result {
  margin-top: 16px; padding: 18px;
  background: rgba(92,242,163,0.05);
  border: 1px solid rgba(92,242,163,0.2);
  border-radius: 10px;
  font-family: var(--mono); font-size: 0.86rem; color: var(--accent);
  display: none; line-height: 1.7;
}
.calc-result.error { color: var(--warn); background: var(--warn-soft); border-color: rgba(251,191,36,0.25); }
.calc-result strong { color: var(--ink); font-weight: 500; }
.calc-result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.calc-result-cell .k { color: var(--ink-mute); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; }
.calc-result-cell .v { color: var(--ink); font-size: 1.05rem; margin-top: 4px; }
.calc-result-cell .v em { color: var(--accent); font-style: normal; }

/* ---------- Guides ---------- */
.guides-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.guide-card {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: 24px;
  color: var(--ink);
  transition: border-color 0.15s, transform 0.15s;
  display: flex; flex-direction: column; gap: 10px;
}
.guide-card:hover { border-color: var(--hairline-3); transform: translateY(-2px); }
.guide-num {
  font-family: var(--mono); font-size: 0.74rem; color: var(--accent);
  letter-spacing: 0.16em;
}
.guide-card h3 { font-size: 1.05rem; font-weight: 600; }
.guide-card p { font-size: 0.85rem; color: var(--ink-soft); flex: 1; }

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--hairline);
  background: linear-gradient(180deg, transparent, rgba(0,0,0,0.4));
  padding: 64px 28px 28px;
  color: var(--ink-mute);
}
.footer-grid {
  max-width: 1280px; margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 56px;
  margin-bottom: 48px;
}
.footer-brand .nav-logo { margin-bottom: 14px; }
.footer-brand p { font-size: 0.85rem; line-height: 1.6; max-width: 360px; color: var(--ink-soft); }
.footer-col h4 {
  font-family: var(--mono); font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-soft);
  margin-bottom: 14px;
}
.footer-col a {
  display: block; color: var(--ink-mute); font-size: 0.88rem;
  padding: 4px 0;
  transition: color 0.15s;
}
.footer-col a:hover { color: var(--ink); }

.footer-disclaimer {
  max-width: 1280px; margin: 0 auto;
  font-size: 0.78rem; line-height: 1.7; color: var(--ink-faint);
  border-top: 1px solid var(--hairline);
  padding-top: 24px;
  margin-bottom: 18px;
}
.footer-disclaimer strong { color: var(--ink-soft); font-weight: 500; }
.footer-bottom {
  max-width: 1280px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  font-family: var(--mono); font-size: 0.75rem; color: var(--ink-faint);
}

/* =====================================================================
   Protocol / guide page layout
   ===================================================================== */
.page-layout {
  max-width: 1200px; margin: 0 auto;
  padding: 56px 28px;
  display: grid; grid-template-columns: minmax(0,1fr) 280px;
  gap: 56px; align-items: start;
}
.breadcrumb {
  display: flex; gap: 8px; align-items: center;
  font-family: var(--mono); font-size: 0.74rem; color: var(--ink-mute);
  margin-bottom: 24px; flex-wrap: wrap;
  letter-spacing: 0.04em;
}
.breadcrumb a { color: var(--ink-soft); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { color: var(--ink-faint); }

.protocol-tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 0.7rem; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(92,242,163,0.2);
  padding: 5px 12px; border-radius: 99px;
  margin-bottom: 18px;
}

.page-layout main h1 {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  letter-spacing: -0.025em;
  margin-bottom: 18px;
}
.page-layout main > p {
  font-size: 0.98rem; color: var(--ink-soft); line-height: 1.7;
  margin-bottom: 18px;
}

.quickstart {
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--hairline-2);
  border-radius: var(--r-lg);
  padding: 26px 28px;
  margin: 28px 0 36px;
  box-shadow: var(--shadow-sm);
  position: relative; overflow: hidden;
}
.quickstart::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.5;
}
.quickstart h2 {
  font-size: 0.78rem; font-family: var(--mono); font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 18px;
  padding-left: 0; /* override main h2 */
}
.quickstart h2::before { display: none; }
.qs-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.qs-item {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 14px 16px;
}
.qs-item .label {
  font-family: var(--mono); font-size: 0.68rem; color: var(--ink-mute);
  letter-spacing: 0.12em; text-transform: uppercase;
  margin-bottom: 6px;
}
.qs-item .val {
  font-family: var(--mono); font-size: 0.92rem; color: var(--ink);
  font-weight: 500; letter-spacing: -0.005em;
}

.page-layout main h2 {
  font-size: 1.55rem; letter-spacing: -0.02em;
  margin: 48px 0 14px;
  color: var(--ink);
  position: relative; padding-left: 18px;
}
.page-layout main h2::before {
  content: ''; position: absolute; left: 0; top: 8px; bottom: 8px; width: 3px;
  background: var(--accent); border-radius: 99px;
}
.page-layout main h3 {
  font-size: 1rem; font-weight: 600; color: var(--ink);
  margin: 28px 0 10px;
}
.page-layout main p {
  font-size: 0.94rem; color: var(--ink-soft); line-height: 1.75;
  margin-bottom: 14px;
}
.page-layout main ol, .page-layout main ul {
  padding-left: 22px;
  font-size: 0.94rem; color: var(--ink-soft);
}
.page-layout main ol li, .page-layout main ul li {
  margin-bottom: 8px; line-height: 1.7;
}
.page-layout strong { color: var(--ink); font-weight: 600; }

/* TOC */
.toc {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: 22px 22px 18px;
}
.toc h4 {
  font-family: var(--mono); font-size: 0.7rem; font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-mute); margin-bottom: 12px;
}
.toc a {
  display: block; font-size: 0.83rem; color: var(--ink-soft);
  padding: 6px 12px; border-left: 2px solid var(--hairline-2);
  margin-bottom: 2px;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  border-radius: 0 6px 6px 0;
}
.toc a:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.related-box {
  margin-top: 14px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: 18px;
}
.related-box h4 {
  font-family: var(--mono); font-size: 0.7rem; font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-mute); margin-bottom: 12px;
}
.related-link {
  display: block; padding: 9px 12px;
  background: var(--accent-soft);
  border: 1px solid rgba(92,242,163,0.2);
  border-radius: 8px;
  color: var(--accent); font-size: 0.82rem; font-weight: 500;
  margin-bottom: 8px;
}
.related-link-plain {
  display: block; font-size: 0.82rem; color: var(--ink-soft); padding: 4px 0;
}
.related-link-plain:hover { color: var(--accent); }

/* Tables */
table {
  width: 100%; border-collapse: separate; border-spacing: 0;
  margin: 22px 0; font-size: 0.88rem;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  overflow: hidden;
}
th {
  background: var(--surface-2);
  color: var(--ink); text-align: left;
  padding: 12px 16px;
  font-family: var(--mono); font-size: 0.74rem; font-weight: 500;
  letter-spacing: 0.1em; text-transform: uppercase;
  border-bottom: 1px solid var(--hairline-2);
}
td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink-soft);
  font-family: var(--mono); font-size: 0.86rem;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,255,255,0.015); color: var(--ink); }

.note-box {
  background: rgba(251,191,36,0.06);
  border: 1px solid rgba(251,191,36,0.25);
  border-left: 3px solid var(--warn);
  border-radius: 0 10px 10px 0;
  padding: 14px 18px; margin: 22px 0;
  font-size: 0.88rem; color: #d6a82a; line-height: 1.65;
}
.note-box strong { color: var(--warn); }
.info-box {
  background: var(--accent-soft);
  border: 1px solid rgba(92,242,163,0.22);
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  padding: 14px 18px; margin: 22px 0;
  font-size: 0.88rem; color: var(--accent); line-height: 1.65;
}
.info-box strong { color: #b6f6d2; }
.warn-box {
  background: rgba(251,191,36,0.06);
  border: 1px solid rgba(251,191,36,0.22);
  border-radius: var(--r-md);
  padding: 16px;
  margin-top: 16px;
  font-size: 0.82rem; color: #d6a82a; line-height: 1.65;
}
.warn-box strong { color: var(--warn); }

/* References */
.refs {
  border-top: 1px solid var(--hairline);
  padding-top: 36px; margin-top: 56px;
}
.ref-item {
  display: flex; gap: 12px; margin-bottom: 14px;
  font-family: var(--mono); font-size: 0.82rem; color: var(--ink-soft);
  line-height: 1.6;
}
.ref-num {
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  color: var(--accent);
  width: 24px; height: 24px;
  border-radius: 6px;
  display: grid; place-items: center;
  font-size: 0.7rem; font-weight: 500;
  flex-shrink: 0; margin-top: 1px;
}
.ref-item a { color: var(--accent); }
.ref-item a:hover { text-decoration: underline; }

/* =====================================================================
   Glossary, FAQ, simple pages
   ===================================================================== */
.simple-page { max-width: 920px; margin: 0 auto; padding: 64px 28px 96px; }
.simple-page h1 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 16px; }
.simple-page > p.lede { font-size: 1.05rem; color: var(--ink-soft); margin-bottom: 32px; }
.simple-page h2 { font-size: 1.4rem; margin: 36px 0 14px; }
.simple-page h3 { font-size: 1.05rem; margin: 22px 0 10px; }
.simple-page p, .simple-page li { color: var(--ink-soft); font-size: 0.95rem; line-height: 1.75; }
.simple-page ul, .simple-page ol { padding-left: 22px; margin: 12px 0 18px; }
.simple-page strong { color: var(--ink); font-weight: 600; }
.simple-page hr { border: 0; border-top: 1px solid var(--hairline); margin: 36px 0; }
.simple-page .lead, .simple-page p.lead {
  font-size: 1.1rem; color: var(--ink-soft); margin-bottom: 32px; line-height: 1.7;
  max-width: 720px;
}
.simple-page table { background: var(--surface); }

.faq-item {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: 20px 22px; margin-bottom: 12px;
  transition: border-color 0.15s;
}
.faq-item:hover { border-color: var(--hairline-3); }
.faq-q { font-size: 0.98rem; font-weight: 600; color: var(--ink); margin-bottom: 8px; letter-spacing: -0.01em; }
.faq-a { font-size: 0.92rem; color: var(--ink-soft); line-height: 1.7; }

.example-box {
  background: linear-gradient(180deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 1px solid var(--hairline-2);
  border-radius: var(--r-md);
  padding: 22px 26px; margin: 24px 0;
  position: relative; overflow: hidden;
}
.example-box::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent); opacity: 0.4;
}
.example-box .ex-label {
  font-family: var(--mono); font-size: 0.7rem; font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px;
}
.example-box .math {
  font-family: var(--mono); font-size: 0.92rem; line-height: 1.85;
  color: var(--ink);
}

/* Keep legacy class names working — original site used a bare <nav> selector */
nav.nav { padding: 0; gap: 0; height: auto; background: rgba(7,8,10,0.72); }

/* =====================================================================
   Glossary
   ===================================================================== */
.page-header {
  max-width: 1080px; margin: 0 auto;
  padding: 56px 28px 24px;
}
.page-header h1 {
  font-size: clamp(2rem, 4.4vw, 3.2rem);
  letter-spacing: -0.03em; margin-bottom: 12px;
}
.page-header p { font-size: 1rem; color: var(--ink-soft); max-width: 640px; }

.search-bar {
  max-width: 1080px; margin: 0 auto;
  padding: 0 28px 20px;
}
.search-bar input {
  width: 100%; padding: 13px 16px;
  background: var(--surface);
  border: 1px solid var(--hairline-2);
  border-radius: 10px;
  color: var(--ink);
  font-family: var(--mono); font-size: 0.92rem;
  outline: none; transition: border-color 0.15s, background 0.15s;
}
.search-bar input::placeholder { color: var(--ink-mute); }
.search-bar input:focus { border-color: var(--accent); background: rgba(92,242,163,0.04); }

.letter-nav {
  max-width: 1080px; margin: 0 auto;
  padding: 0 28px 24px;
  display: flex; gap: 6px; flex-wrap: wrap;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 32px;
  padding-bottom: 24px;
}
.letter-btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  color: var(--ink-soft);
  font-family: var(--mono); font-size: 0.82rem; font-weight: 500;
  text-decoration: none;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
  padding: 0 10px;
}
.letter-btn:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }

.glossary { max-width: 1080px; margin: 0 auto; padding: 0 28px 96px; }
.letter-section { margin-bottom: 36px; scroll-margin-top: 80px; }
.letter-heading {
  font-family: var(--mono); font-size: 0.9rem;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent);
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 8px; margin-bottom: 16px;
}
.hidden { display: none !important; }
.term {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: 16px 20px; margin-bottom: 10px;
  transition: border-color 0.15s;
}
.term:hover { border-color: var(--hairline-3); }
.term-name {
  font-size: 0.96rem; font-weight: 600; color: var(--ink);
  margin-bottom: 6px; letter-spacing: -0.01em;
}
.term-name .abbr { color: var(--ink-mute); font-weight: 500; font-family: var(--mono); font-size: 0.85em; }
.term-def { font-size: 0.9rem; color: var(--ink-soft); line-height: 1.7; }
.term-def a { color: var(--accent); }
.term-def a:hover { text-decoration: underline; }

/* Beginners guide-style category pill row */
.category-pills { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0 22px; }
.cat-pill {
  font-family: var(--mono); font-size: 0.74rem; font-weight: 500;
  letter-spacing: 0.04em; color: var(--ink-soft);
  background: var(--surface);
  border: 1px solid var(--hairline);
  padding: 6px 12px; border-radius: 99px;
}
.cat-pill .emoji { margin-right: 4px; }

/* Disclaimer block embedded inside content (beginners-guide etc) */
.simple-page .note-box { margin: 22px 0; }
.simple-page .info-box { margin: 22px 0; }
.simple-page .example-box { margin: 28px 0; }

/* Highlight strong references in long-form text more subtly */
.simple-page main strong, .page-layout main strong { color: var(--ink); }

/* "Coming soon" or pending-protocol cells */
.coming { font-family: var(--mono); font-size: 0.78rem; color: var(--ink-mute); font-style: italic; margin-top: 8px; }


/* =====================================================================
   Responsive
   ===================================================================== */

/* Sticky sidebar — entire aside locks in viewport */
.page-layout > aside {
  position: sticky;
  top: 78px;
  align-self: start;
  max-height: calc(100vh - 96px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--hairline-2) transparent;
}
.page-layout > aside::-webkit-scrollbar { width: 6px; }
.page-layout > aside::-webkit-scrollbar-track { background: transparent; }
.page-layout > aside::-webkit-scrollbar-thumb { background: var(--hairline-2); border-radius: 6px; }

@media (max-width: 1024px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: 1fr; gap: 48px; padding: 72px 28px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
}
@media (max-width: 760px) {
  .nav-inner { padding: 0 18px; gap: 14px; }
  .nav-link { display: none; }
  .nav-cta { padding: 7px 12px; font-size: 0.8rem; }
  .hero { padding: 56px 20px 40px; }
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .section, .section-tight { padding: 64px 20px; }
  .cards-grid, .cat-grid, .guides-grid { grid-template-columns: 1fr; }
  .calc-fields { grid-template-columns: 1fr; }
  .calc-result-grid { grid-template-columns: 1fr; }
  .qs-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .page-layout { grid-template-columns: 1fr; padding: 40px 20px; gap: 32px; }
  .toc { display: none; }
  table { font-size: 0.8rem; }
  th, td { padding: 10px 12px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: 1fr; }
}