/* ═══════════════════════════════════════════════════════════════
   CALCENGINE — NEON TERMINAL THEME
   Background → Pure Black / Charcoal (#000000, #0C0C0C)
   Text       → White / Muted Silver  (#FFFFFF, #A1A1AA)
   Accent 1   → Teal    #00F0FF  (CASH · primary actions)
   Accent 2   → Purple  #B026FF  (CODE · borders, focus)
   Accent 3   → Yellow  #E5FF00  (CLASS · alerts, badges)
═══════════════════════════════════════════════════════════════ */
:root {
  /* ── NEUTRAL DARK PALETTE ── */
  --bg-void:       #000000;
  --bg-base:       #0C0C0C;
  --bg-surface:    #121215;
  --bg-elevated:   #17171B;
  --bg-input:      #0A0A0D;
  --bg-hover:      #1C1C22;

  /* ── DARK SURFACE PALETTE (headers, panels — formerly navy) ── */
  --navy-deep:     #050506;
  --navy-primary:  #0C0C0E;
  --navy-mid:      #141419;
  --navy-light:    #1E1E26;
  --navy-subtle:   rgba(0,240,255,0.05);
  --navy-glow:     rgba(0,240,255,0.10);

  /* ── ACCENT 1 · NEON TEAL (primary action) ── */
  --accent:        #00F0FF;
  --accent-hover:  #5CF6FF;
  --accent-light:  #7DF9FF;
  --accent-subtle: rgba(0,240,255,0.08);
  --accent-glow:   rgba(0,240,255,0.25);

  /* ── ACCENT 2 · NEON PURPLE (secondary, focus) ── */
  --accent2:       #B026FF;
  --accent2-light: #C965FF;
  --accent2-subtle:rgba(176,38,255,0.10);
  --accent2-glow:  rgba(176,38,255,0.30);

  /* ── ACCENT 3 · ELECTRIC YELLOW (alerts, badges) ── */
  --accent3:       #E5FF00;
  --accent3-subtle:rgba(229,255,0,0.10);
  --accent3-glow:  rgba(229,255,0,0.25);

  /* ── SEMANTIC COLORS (neon-tuned) ── */
  --green-data:    #2AFFB2;
  --green-mid:     #00E39C;
  --green-dim:     #0E3B2D;
  --green-subtle:  rgba(42,255,178,0.10);
  --red-warn:      #FF4D6D;
  --red-subtle:    rgba(255,77,109,0.10);
  --blue-info:     #00F0FF;
  --blue-subtle:   rgba(0,240,255,0.08);

  /* ── BORDERS ── */
  --border-dim:    #1E1E26;
  --border-mid:    #2C2C38;
  --border-active: #B026FF;

  /* ── TEXT ── */
  --text-primary:  #FFFFFF;
  --text-secondary:#A1A1AA;
  --text-dim:      #6B6B76;
  --text-mono:     #E8E8F0;

  /* ── TYPOGRAPHY ── */
  /* Inter for UI · JetBrains Mono for numerics/outputs (terminal feel) */
  --font-display:  'Inter', system-ui, sans-serif;
  --font-body:     'Inter', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', monospace;

  /* ── LAYOUT ── */
  --sidebar-w:     300px;
  --header-h:      54px;
  --bc-h:          36px;
  --ad-h:          90px;
  --ad-mob-h:      60px;
  --max-w:         1440px;
  --t-fast:        130ms ease;
  --t-mid:         240ms ease;
  --radius:        5px;

  /* ── SHADOWS (neon glow on dark) ── */
  --shadow-sm:     0 0 0 1px rgba(255,255,255,0.03), 0 2px 8px rgba(0,0,0,0.6);
  --shadow-md:     0 0 0 1px rgba(255,255,255,0.04), 0 4px 18px rgba(0,0,0,0.7);
  --shadow-lg:     0 0 24px rgba(0,240,255,0.10), 0 8px 32px rgba(0,0,0,0.8);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 15px; }

body {
  font-family: var(--font-body);
  font-variant-numeric: tabular-nums;
  background: var(--bg-void);
  color: var(--text-primary);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--bg-elevated); }
::-webkit-scrollbar-thumb { background: var(--border-mid); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--navy-light); }

/* ═══════════════════════════════════════════════════════════════
   HEADER — Navy (30% color)
═══════════════════════════════════════════════════════════════ */
#site-header {
  position: sticky; top: 0; z-index: 200;
  height: var(--header-h);
  background: var(--navy-primary);
  border-bottom: 3px solid var(--accent);
  display: flex; align-items: center;
  padding: 0 24px; gap: 14px;
  box-shadow: var(--shadow-lg);
}

.logo {
  font-family: var(--font-display);
  font-size: 1.45rem; font-weight: 800;
  letter-spacing: 0.09em; color: #FFFFFF;
  text-transform: uppercase; text-decoration: none;
  cursor: pointer; display: flex; align-items: baseline; gap: 4px;
  transition: opacity var(--t-fast);
}
.logo:hover { opacity: 0.88; }
.logo-sub {
  font-size: 0.58em; color: rgba(255,255,255,0.45);
  font-weight: 300; letter-spacing: 0.18em;
}

/* Search */
.search-wrap { flex: 1; max-width: 500px; position: relative; }
.search-input {
  width: 100%;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.22);
  border-radius: 4px;
  padding: 7px 12px 7px 33px;
  font-family: var(--font-mono); font-size: 0.76rem;
  color: #FFFFFF; outline: none;
  transition: background var(--t-fast), border-color var(--t-fast), box-shadow var(--t-fast);
}
.search-input::placeholder { color: rgba(255,255,255,0.45); }
.search-input:focus {
  background: rgba(0,240,255,0.06);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow), 0 0 16px rgba(0,240,255,0.15);
}
.search-icon {
  position: absolute; left: 10px; top: 50%; transform: translateY(-50%);
  color: rgba(255,255,255,0.5); font-size: 0.9rem; pointer-events: none; line-height: 1;
}

.search-drop {
  position: absolute; top: calc(100% + 5px); left: 0; right: 0;
  background: var(--bg-surface); border: 1px solid var(--border-mid);
  border-radius: 5px; box-shadow: var(--shadow-lg);
  z-index: 300; display: none; overflow: hidden;
  max-height: 360px; overflow-y: auto;
}
.search-drop.open { display: block; }
.sr-item {
  padding: 10px 15px; cursor: pointer;
  display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid var(--border-dim);
  transition: background var(--t-fast);
}
.sr-item:last-child { border-bottom: none; }
.sr-item:hover, .sr-item.active { background: var(--accent-subtle); }
.sr-name {
  font-family: var(--font-mono); font-size: 0.77rem;
  color: var(--text-primary); flex: 1;
}
.sr-name mark {
  background: rgba(0,240,255,0.18); color: var(--accent-hover);
  border-radius: 2px; font-style: normal;
}
.sr-cat {
  font-family: var(--font-mono); font-size: 0.59rem;
  color: var(--accent); background: var(--navy-subtle);
  padding: 2px 7px; border-radius: 10px;
  border: 1px solid rgba(26,58,92,0.15); white-space: nowrap;
}

/* Header right */
.hdr-right { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.hdr-btn {
  font-family: var(--font-mono); font-size: 0.67rem;
  color: rgba(255,255,255,0.75);
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.20);
  border-radius: 3px; padding: 5px 11px;
  cursor: pointer; letter-spacing: 0.04em; text-transform: uppercase;
  transition: all var(--t-fast); text-decoration: none; white-space: nowrap;
}
.hdr-btn:hover {
  background: var(--accent); border-color: var(--accent);
  color: #FFFFFF;
}
.hdr-btn.active { background: var(--accent); border-color: var(--accent); color: #000000; }
.kbd-hint { display: flex; align-items: center; gap: 5px;
  font-family: var(--font-mono); font-size: 0.6rem; color: rgba(255,255,255,0.4); flex-shrink: 0; }
.kbd {
  background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.2);
  border-radius: 3px; padding: 1px 6px; font-size: 0.62rem; color: rgba(255,255,255,0.5);
}

/* ═══════════════════════════════════════════════════════════════
   BREADCRUMB — Light bar with navy accents
═══════════════════════════════════════════════════════════════ */
#breadcrumb {
  height: var(--bc-h);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-dim);
  display: flex; align-items: center; padding: 0 24px; gap: 6px;
  overflow-x: auto; white-space: nowrap;
  box-shadow: var(--shadow-sm);
}
#breadcrumb::-webkit-scrollbar { height: 0; }
.bc {
  font-family: var(--font-mono); font-size: 0.67rem;
  color: var(--text-dim); text-decoration: none;
  transition: color var(--t-fast); cursor: pointer;
}
.bc:hover { color: var(--accent); }
.bc.current { color: var(--text-primary); font-weight: 500; cursor: default; }
.bc-sep { color: var(--border-mid); font-size: 0.62rem; }
.bc-tag {
  font-family: var(--font-mono); font-size: 0.57rem;
  color: var(--accent-hover);
  background: var(--accent-subtle); border: 1px solid rgba(0,240,255,0.25);
  padding: 1px 7px; border-radius: 10px; margin-left: 6px;
  text-transform: uppercase; letter-spacing: 0.07em;
}

/* ═══════════════════════════════════════════════════════════════
   VIEWS
═══════════════════════════════════════════════════════════════ */
.view { display: none; }
.view.active { display: block; }

/* ═══════════════════════════════════════════════════════════════
   HOME VIEW
═══════════════════════════════════════════════════════════════ */
#home-view { max-width: var(--max-w); margin: 0 auto; padding: 32px 24px 64px; }

.home-hero {
  padding: 36px 0 28px;
  display: flex; align-items: flex-end;
  justify-content: space-between; gap: 20px;
  border-bottom: 2px solid var(--border-dim); margin-bottom: 32px;
}
.hero-text {}
.hero-eyebrow {
  font-family: var(--font-mono); font-size: 0.63rem; color: var(--accent);
  letter-spacing: 0.22em; text-transform: uppercase; margin-bottom: 10px;
  display: flex; align-items: center; gap: 10px;
}
.hero-eyebrow::after {
  content: ''; width: 40px; height: 2px; background: var(--accent); border-radius: 1px;
}
.calc-title {
  font-family: var(--font-display); font-size: 3rem; font-weight: 800;
  letter-spacing: 0.02em; line-height: 0.95;
  color: var(--text-primary); text-transform: uppercase;
}
.calc-title span { color: var(--accent); }
.hero-cta {
  margin-top: 18px; padding: 12px 26px;
  font-family: var(--font-display); font-size: 0.95rem; font-weight: 800;
  letter-spacing: 0.05em; text-transform: uppercase;
  background: var(--accent); color: #000000; border: none;
  border-radius: 6px; cursor: pointer; transition: all var(--t-fast);
  box-shadow: 0 0 18px var(--accent-glow);
}
.hero-cta:hover {
  background: var(--accent-hover); transform: translateY(-2px);
  box-shadow: 0 0 28px rgba(0,240,255,0.45);
}
.hero-desc {
  font-size: 0.9rem; color: var(--text-secondary);
  max-width: 520px; line-height: 1.65; margin-top: 12px;
}

.hero-stats { display: flex; gap: 28px; flex-shrink: 0; }
.stat-item { text-align: right; }
.stat-val {
  font-family: var(--font-mono); font-size: 2rem; font-weight: 700;
  color: var(--accent); display: block; line-height: 1;
}
.stat-label {
  font-family: var(--font-mono); font-size: 0.58rem;
  color: var(--text-dim); text-transform: uppercase;
  letter-spacing: 0.1em; margin-top: 3px; display: block;
}

/* Section heads */
.section-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 14px;
}
.section-title {
  font-family: var(--font-mono); font-size: 0.63rem;
  color: var(--text-primary); letter-spacing: 0.18em;
  text-transform: uppercase; font-weight: 600;
  display: flex; align-items: center; gap: 10px;
}
.section-title::after {
  content: ''; width: 28px; height: 2px;
  background: var(--navy-light); border-radius: 1px;
}
.see-all {
  font-family: var(--font-mono); font-size: 0.65rem; color: var(--text-dim);
  cursor: pointer; transition: color var(--t-fast); letter-spacing: 0.04em;
  text-decoration: none; background: none; border: none;
}
.see-all:hover { color: var(--accent); }

/* Category cards */
.cat-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px; margin-bottom: 32px;
}
.cat-card {
  background: var(--bg-surface); border: 1px solid var(--border-dim);
  border-radius: 6px; padding: 18px; cursor: pointer;
  transition: all var(--t-fast); position: relative; overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.cat-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--cat-color, var(--accent)); opacity: 0;
  transition: opacity var(--t-fast);
}
.cat-card:hover {
  border-color: var(--border-active); background: var(--bg-hover);
  transform: translateY(-2px); box-shadow: var(--shadow-md);
}
.cat-card:hover::before { opacity: 1; }
.cat-icon { font-size: 1.5rem; margin-bottom: 9px; display: block; line-height: 1; }
.cat-name {
  font-family: var(--font-display); font-size: 1rem; font-weight: 700;
  letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--text-primary); margin-bottom: 4px;
}
.cat-desc { font-size: 0.76rem; color: var(--text-dim); line-height: 1.55; }
.cat-count {
  font-family: var(--font-mono); font-size: 0.6rem;
  color: var(--cat-color, var(--accent)); margin-top: 10px;
  letter-spacing: 0.06em; font-weight: 600;
}

/* Calculator card grid */
.calc-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 8px; margin-bottom: 32px;
}
.calc-card {
  background: var(--bg-surface); border: 1px solid var(--border-dim);
  border-radius: 5px; padding: 12px 15px; cursor: pointer;
  display: flex; align-items: center; gap: 12px;
  transition: all var(--t-fast); box-shadow: var(--shadow-sm);
}
.calc-card:hover {
  border-color: var(--accent); background: var(--accent-subtle);
  box-shadow: var(--shadow-md);
}
.calc-card-num {
  font-family: var(--font-mono); font-size: 0.6rem;
  color: var(--text-dim); width: 32px; text-align: right; flex-shrink: 0;
}
.calc-card-body { flex: 1; min-width: 0; }
.calc-card-name {
  font-family: var(--font-mono); font-size: 0.79rem; font-weight: 500;
  color: var(--text-primary); white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.calc-card-cat { font-family: var(--font-mono); font-size: 0.6rem; color: var(--text-dim); margin-top: 2px; }
.calc-card-arrow {
  color: var(--border-mid); font-size: 0.75rem; flex-shrink: 0;
  transition: color var(--t-fast), transform var(--t-fast);
}
.calc-card:hover .calc-card-arrow { color: var(--accent); transform: translateX(3px); }

/* Featured cards */
.featured-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 32px; }
@media(max-width:800px) { .featured-strip { grid-template-columns: 1fr; } }
.featured-card {
  background: var(--navy-primary); border: 1px solid var(--navy-mid);
  border-radius: 7px; padding: 22px; cursor: pointer;
  transition: all var(--t-mid); position: relative; overflow: hidden;
  box-shadow: var(--shadow-md);
}
.featured-card::before {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px;
  background: var(--accent);
}
.featured-card:hover {
  background: var(--navy-mid);
  transform: translateY(-3px); box-shadow: var(--shadow-lg);
}
.featured-label {
  font-family: var(--font-mono); font-size: 0.58rem;
  color: rgba(255,255,255,0.55); letter-spacing: 0.14em;
  text-transform: uppercase; margin-bottom: 8px;
}
.featured-name {
  font-family: var(--font-display); font-size: 1.2rem; font-weight: 700;
  color: #FFFFFF; letter-spacing: 0.03em; margin-bottom: 6px; line-height: 1.2;
}
.featured-card > div:nth-child(3) { font-size: 0.77rem; color: rgba(255,255,255,0.6); }
.featured-tags { display: flex; gap: 5px; flex-wrap: wrap; margin-top: 10px; }
.tag {
  font-family: var(--font-mono); font-size: 0.57rem;
  padding: 2px 7px; border-radius: 10px; border: 1px solid;
}
.tag-green { color: #6EDBB8; border-color: rgba(110,219,184,0.3); background: rgba(110,219,184,0.1); }
.tag-amber { color: var(--accent3); border-color: rgba(229,255,0,0.35); background: var(--accent3-subtle); }
.tag-blue  { color: var(--accent); border-color: rgba(0,240,255,0.3); background: var(--accent-subtle); }

/* ═══════════════════════════════════════════════════════════════
   CATEGORY VIEW
═══════════════════════════════════════════════════════════════ */
#cat-view { max-width: var(--max-w); margin: 0 auto; padding: 28px 24px 64px; }
.cat-view-header { margin-bottom: 24px; }
.cat-view-title {
  font-family: var(--font-display); font-size: 2.2rem; font-weight: 800;
  letter-spacing: 0.03em; text-transform: uppercase; color: var(--text-primary);
}
.cat-view-desc { font-size: 0.85rem; color: var(--text-secondary); margin-top: 6px; max-width: 600px; }

/* ═══════════════════════════════════════════════════════════════
   CALCULATOR PAGE — 5-ROW LAYOUT
═══════════════════════════════════════════════════════════════ */
#calc-view { display: none; }
#calc-view.active {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-w);
  max-width: var(--max-w); margin: 0 auto;
  min-height: calc(100vh - var(--header-h) - var(--bc-h));
}
.calc-main {
  padding: 20px 24px; border-right: 1px solid var(--border-dim);
  min-width: 0; display: flex; flex-direction: column; gap: 16px;
}

/* Row 3: calc title strip */
.calc-hdr {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 12px; padding-bottom: 16px; border-bottom: 2px solid var(--border-dim);
}
.calc-title {
  font-family: var(--font-display); font-size: 1.75rem; font-weight: 700;
  letter-spacing: 0.02em; color: var(--text-primary); line-height: 1.1;
}
.calc-subtitle {
  font-size: 0.79rem; color: var(--text-secondary); margin-top: 5px;
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.std-tag {
  font-family: var(--font-mono); font-size: 0.57rem;
  color: var(--green-data); background: var(--green-subtle);
  border: 1px solid rgba(10,112,85,0.22); padding: 2px 7px; border-radius: 10px;
}
.calc-hdr-right {
  display: flex; flex-direction: column; align-items: flex-end;
  gap: 3px; flex-shrink: 0;
}
.calc-meta-row {
  font-family: var(--font-mono); font-size: 0.6rem;
  color: var(--text-dim); letter-spacing: 0.04em;
}
.status-dot { font-size: 0.65rem; }
.status-dot.ready { color: var(--green-mid); }
.status-dot.done { color: var(--accent); }

/* Row 4: two-column calc zone */
.calc-zone {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px; flex-shrink: 0;
}
@media(max-width:860px) { .calc-zone { grid-template-columns: 1fr; } }

/* Input zone */
.input-zone {
  background: var(--bg-surface); border: 1px solid var(--border-dim);
  border-top: 3px solid var(--navy-primary);
  border-radius: 6px; display: flex; flex-direction: column;
  overflow: hidden; box-shadow: var(--shadow-sm);
}
.zone-hdr {
  background: var(--navy-primary); padding: 8px 15px;
  display: flex; align-items: center; justify-content: space-between;
}
.zone-lbl {
  font-family: var(--font-mono); font-size: 0.62rem;
  font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
}
.zone-lbl.inp { color: rgba(255,255,255,0.9); }
.zone-lbl.out { color: rgba(255,255,255,0.9); }
.zone-cnt { font-family: var(--font-mono); font-size: 0.58rem; color: rgba(255,255,255,0.45); }

.fields {
  padding: 15px; flex: 1; display: flex;
  flex-direction: column; gap: 12px; overflow-y: auto;
}

.field-row { display: flex; flex-direction: column; gap: 4px; }
.field-lbl {
  font-family: var(--font-mono); font-size: 0.65rem;
  color: var(--text-primary); letter-spacing: 0.03em;
  display: flex; align-items: center; justify-content: space-between;
  font-weight: 500;
}
.field-lbl span { color: var(--text-dim); font-weight: 400; }
.req { color: var(--accent); margin-left: 2px; }

.field-group { display: flex; gap: 0; }
.f-input {
  flex: 1; background: var(--bg-input);
  border: 1px solid var(--border-mid);
  border-right: none; border-radius: 4px 0 0 4px;
  padding: 8px 11px;
  font-family: var(--font-mono); font-size: 0.84rem;
  color: var(--text-primary); outline: none; min-width: 0;
  transition: border-color var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
}
.f-input:focus {
  border-color: var(--accent2); background: var(--bg-elevated);
  box-shadow: 0 0 0 3px var(--accent2-glow), 0 0 12px var(--accent2-subtle);
}
.f-input::placeholder { color: var(--text-dim); font-size: 0.76rem; }
.f-input.filled { color: var(--accent); background: var(--bg-elevated); font-weight: 500; }
.f-input.select-full {
  border-right: 1px solid var(--border-mid); border-radius: 4px;
  appearance: none; -webkit-appearance: none; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='5'%3E%3Cpath d='M0 0l4 5 4-5z' fill='%238A9DB2'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center;
  padding-right: 26px; background-color: var(--bg-input);
}
.u-sel {
  background: var(--bg-elevated); border: 1px solid var(--border-mid);
  border-radius: 0 4px 4px 0; padding: 0 8px;
  font-family: var(--font-mono); font-size: 0.7rem;
  color: var(--text-secondary); cursor: pointer; outline: none;
  appearance: none; -webkit-appearance: none;
  min-width: 58px; text-align: center;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='6' height='4'%3E%3Cpath d='M0 0l3 4 3-4z' fill='%238A9DB2'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 5px center;
  padding-right: 16px; transition: all var(--t-fast);
}
.u-sel:hover, .u-sel:focus { border-color: var(--accent); color: var(--accent); }

.btn-row {
  padding: 11px 15px; border-top: 1px solid var(--border-dim);
  display: flex; gap: 9px; background: var(--bg-elevated);
}
.calc-btn {
  flex: 1; padding: 10px;
  font-family: var(--font-display); font-size: 1rem;
  font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  background: var(--accent); color: #000000; border: none;
  border-radius: 4px; cursor: pointer; transition: all var(--t-fast);
  position: relative; overflow: hidden;
}
.calc-btn:hover {
  background: var(--accent-hover); transform: translateY(-1px);
  box-shadow: 0 0 20px var(--accent-glow), 0 4px 16px rgba(0,240,255,0.25);
}
.calc-btn:active { transform: translateY(0); box-shadow: none; }
.calc-btn::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.14), transparent);
  transform: translateX(-100%); transition: transform 0.45s;
}
.calc-btn:hover::after { transform: translateX(100%); }
.reset-btn {
  padding: 10px 14px; font-family: var(--font-mono); font-size: 0.7rem;
  font-weight: 500; letter-spacing: 0.04em;
  background: transparent; color: var(--text-dim);
  border: 1px solid var(--border-mid); border-radius: 4px;
  cursor: pointer; transition: all var(--t-fast);
}
.reset-btn:hover { border-color: var(--red-warn); color: var(--red-warn); background: var(--red-subtle); }

/* Output zone */
.output-zone {
  background: var(--bg-surface);
  border: 1px solid var(--border-dim);
  border-top: 3px solid var(--green-mid);
  border-radius: 6px; display: flex;
  flex-direction: column; overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.output-content {
  flex: 1; padding: 15px;
  display: flex; flex-direction: column; gap: 6px; overflow-y: auto;
}
.out-empty {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  justify-content: center; color: var(--text-dim);
  font-family: var(--font-mono); font-size: 0.7rem;
  gap: 8px; letter-spacing: 0.06em; text-transform: uppercase; opacity: 0.6;
}
.out-empty-icon { font-size: 1.8rem; opacity: 0.35; }

.out-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 7px 10px; border-radius: 4px; gap: 10px;
  border-left: 3px solid transparent;
  animation: fadeup 0.18s ease both;
  transition: background var(--t-fast);
}
.out-row:hover { background: var(--bg-elevated); }
.out-row.primary {
  border-left-color: var(--green-mid);
  background: var(--green-subtle);
}
.out-row.warn { border-left-color: var(--accent); background: var(--accent-subtle); }
.out-row.fail { border-left-color: var(--red-warn); background: var(--red-subtle); }
.out-k {
  font-family: var(--font-mono); font-size: 0.7rem;
  color: var(--text-secondary); flex: 1;
}
.out-v {
  font-family: var(--font-mono); font-size: 0.88rem;
  font-weight: 600; color: var(--green-data); text-align: right; white-space: nowrap;
}
.out-v.big { font-size: 1.2rem; color: var(--accent); font-weight: 700; }
.out-v.warn { color: var(--accent-hover); }
.out-v.fail { color: var(--red-warn); }
.out-u { font-family: var(--font-mono); font-size: 0.6rem; color: var(--text-dim); min-width: 28px; text-align: right; }
.out-divider { height: 1px; background: var(--border-dim); margin: 2px 0; }

.out-unit-row {
  padding: 7px 15px; border-top: 1px solid var(--border-dim);
  display: flex; align-items: center; gap: 8px;
  background: var(--bg-elevated); flex-wrap: wrap;
}
.out-unit-lbl {
  font-family: var(--font-mono); font-size: 0.6rem; color: var(--text-dim);
  text-transform: uppercase; letter-spacing: 0.08em; white-space: nowrap;
}
.out-unit-btns { display: flex; gap: 4px; flex-wrap: wrap; }
.ou-btn {
  font-family: var(--font-mono); font-size: 0.62rem; padding: 3px 9px;
  border-radius: 10px; border: 1px solid var(--border-mid);
  background: var(--bg-surface); color: var(--text-secondary); cursor: pointer;
  transition: all var(--t-fast);
}
.ou-btn.active {
  background: var(--accent); border-color: var(--accent);
  color: #000000;
}
.ou-btn:hover:not(.active) { border-color: var(--accent); color: var(--accent); }

/* Row 5: Post-result ad — hardcoded height, zero CLS */
.ad-post-result {
  height: var(--ad-h); min-height: var(--ad-h);
  background: var(--bg-elevated); border: 1px dashed var(--border-mid);
  border-radius: 5px; display: flex; align-items: center; justify-content: center;
  overflow: hidden; position: relative;
  contain: layout style; will-change: contents; flex-shrink: 0;
}
.ad-post-result::before {
  content: 'ADVERTISEMENT'; position: absolute; top: 4px; left: 9px;
  font-family: var(--font-mono); font-size: 0.5rem; color: var(--text-dim);
  letter-spacing: 0.12em; opacity: 0.5; pointer-events: none;
}
.ad-inner {
  font-family: var(--font-mono); font-size: 0.65rem;
  color: var(--text-dim); text-align: center; opacity: 0.35; letter-spacing: 0.07em;
}

/* Documentation zone */
.doc-zone { border-top: 2px solid var(--border-dim); padding-top: 28px; margin-top: 4px; }
.doc-zone-lbl {
  font-family: var(--font-mono); font-size: 0.6rem; color: var(--text-secondary);
  letter-spacing: 0.18em; text-transform: uppercase; margin-bottom: 22px;
  display: flex; align-items: center; gap: 12px; font-weight: 600;
}
.doc-zone-lbl::before, .doc-zone-lbl::after { content: ''; flex: 1; height: 1px; background: var(--border-dim); }
.doc-section { margin-bottom: 24px; }
.doc-h {
  font-family: var(--font-display); font-size: 1.1rem; font-weight: 600;
  color: var(--text-primary); margin-bottom: 10px; letter-spacing: 0.02em;
}
.doc-p {
  font-size: 0.84rem; color: var(--text-secondary); line-height: 1.75;
  margin-bottom: 10px; max-width: 680px;
}
.formula-box {
  background: var(--navy-subtle); border: 1px solid rgba(26,58,92,0.15);
  border-left: 4px solid var(--navy-primary);
  padding: 12px 16px; font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--text-primary); border-radius: 0 5px 5px 0;
  line-height: 1.9; margin: 10px 0;
}

/* ═══════════════════════════════════════════════════════════════
   SIDEBAR — Navy (30% element)
═══════════════════════════════════════════════════════════════ */
.calc-sidebar {
  background: var(--bg-base); padding: 16px 14px;
  display: flex; flex-direction: column; gap: 12px;
  position: sticky; top: calc(var(--header-h) + var(--bc-h));
  height: fit-content; align-self: flex-start;
  max-height: calc(100vh - var(--header-h) - var(--bc-h) - 16px);
  overflow-y: auto; border-left: 1px solid var(--border-dim);
}
.calc-sidebar::-webkit-scrollbar { width: 0; }

.sidebar-ad {
  width: 272px; min-height: 250px; background: var(--bg-elevated);
  border: 1px dashed var(--border-mid); border-radius: 5px;
  display: flex; align-items: center; justify-content: center;
  position: relative; contain: layout style; will-change: contents; flex-shrink: 0;
}
.sidebar-ad.tall { min-height: 580px; }
.sidebar-ad::before {
  content: 'AD'; position: absolute; top: 4px; right: 7px;
  font-family: var(--font-mono); font-size: 0.5rem;
  color: var(--text-dim); opacity: 0.35;
}
.sidebar-ad-lbl {
  font-family: var(--font-mono); font-size: 0.6rem; color: var(--text-dim);
  opacity: 0.35; text-align: center; letter-spacing: 0.08em; text-transform: uppercase;
}
.related-list { display: flex; flex-direction: column; gap: 5px; }
.related-lbl {
  font-family: var(--font-mono); font-size: 0.59rem; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.12em;
  margin-bottom: 6px; font-weight: 600;
}
.related-item {
  background: var(--bg-surface); border: 1px solid var(--border-dim);
  border-radius: 4px; padding: 9px 12px; cursor: pointer;
  transition: all var(--t-fast); display: flex; align-items: center; gap: 8px;
  box-shadow: var(--shadow-sm);
}
.related-item:hover { border-color: var(--accent); background: var(--accent-subtle); }
.related-name { font-family: var(--font-mono); font-size: 0.71rem; color: var(--text-primary); flex: 1; }
.related-arrow { color: var(--text-dim); font-size: 0.65rem; transition: color var(--t-fast); }
.related-item:hover .related-arrow { color: var(--accent); }

/* ═══════════════════════════════════════════════════════════════
   MOBILE ANCHOR AD
═══════════════════════════════════════════════════════════════ */
#ad-mob {
  display: none; position: fixed; bottom: 0; left: 0; right: 0;
  height: var(--ad-mob-h); background: var(--bg-surface);
  border-top: 1px solid var(--border-dim); z-index: 150;
  align-items: center; justify-content: center;
  contain: layout style; box-shadow: 0 -2px 8px rgba(26,58,92,0.08);
}
#ad-mob::before {
  content: 'AD'; position: absolute; top: 3px; left: 7px;
  font-family: var(--font-mono); font-size: 0.5rem; color: var(--text-dim); opacity: 0.35;
}

/* ═══════════════════════════════════════════════════════════════
   FOOTER — Navy (30% element)
═══════════════════════════════════════════════════════════════ */
#site-footer {
  background: var(--navy-deep); border-top: 3px solid var(--accent);
  padding: 36px 24px; margin-top: 0;
}
.footer-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px;
}
.footer-title {
  font-family: var(--font-mono); font-size: 0.61rem; color: var(--accent-light);
  text-transform: uppercase; letter-spacing: 0.14em; margin-bottom: 11px; font-weight: 600;
}
.footer-p { font-size: 0.78rem; color: rgba(255,255,255,0.45); line-height: 1.65; }
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 7px; }
.footer-links a {
  font-family: var(--font-mono); font-size: 0.7rem;
  color: rgba(255,255,255,0.45); text-decoration: none; cursor: pointer;
  transition: color var(--t-fast);
}
.footer-links a:hover { color: var(--accent-light); }
.footer-bottom {
  max-width: var(--max-w); margin: 20px auto 0;
  padding-top: 16px; border-top: 1px solid rgba(255,255,255,0.1);
  display: flex; align-items: center; justify-content: space-between;
  font-family: var(--font-mono); font-size: 0.61rem;
  color: rgba(255,255,255,0.3); flex-wrap: wrap; gap: 8px;
}

/* ═══════════════════════════════════════════════════════════════
   ANIMATIONS
═══════════════════════════════════════════════════════════════ */
@keyframes fadeup {
  from { opacity: 0; transform: translateY(5px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes shimmer {
  0%   { background-position: -200% center; }
  100% { background-position: 200% center; }
}
@keyframes pulse-green {
  0%   { box-shadow: 0 0 0 0 rgba(10,112,85,0.3); }
  70%  { box-shadow: 0 0 0 5px rgba(10,112,85,0); }
  100% { box-shadow: none; }
}
.output-zone.flash { animation: pulse-green 0.55s ease forwards; }
.output-zone.calculating {
  background: linear-gradient(90deg, var(--bg-surface) 25%, var(--green-subtle) 50%, var(--bg-surface) 75%);
  background-size: 200% auto; animation: shimmer 0.8s linear;
}

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════════════ */
@media(max-width:1100px) {
  #calc-view.active { grid-template-columns: 1fr; }
  .calc-sidebar { display: none; }
  #ad-mob { display: flex; }
  body { padding-bottom: calc(var(--ad-mob-h) + 6px); }
}
@media(max-width:860px) {
  .calc-zone { grid-template-columns: 1fr; }
  .hero-stats { display: none; }
  .home-hero { padding: 20px 0 16px; }
  .calc-title { font-size: 2.2rem; }
  .featured-strip { grid-template-columns: 1fr 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media(max-width:600px) {
  .cat-grid { grid-template-columns: 1fr 1fr; }
  .featured-strip { grid-template-columns: 1fr; }
  .hdr-btn { display: none; }
  .kbd-hint { display: none; }
  body { padding: 0 0 calc(var(--ad-mob-h) + 6px); }
}
/* ══ LEGAL MODAL ═══════════════════════════════════════════ */
#legal-overlay {
  display: none; position: fixed; inset: 0; z-index: 9999;
  background: rgba(18,40,64,0.55); backdrop-filter: blur(3px);
  align-items: center; justify-content: center; padding: 20px;
}
#legal-overlay.open { display: flex; }
.legal-modal {
  background: var(--bg-surface); border: 1px solid var(--border-mid);
  border-top: 4px solid var(--accent); border-radius: 8px;
  max-width: 680px; width: 100%; max-height: 85vh; overflow-y: auto;
  box-shadow: 0 20px 60px rgba(18,40,64,0.35);
  animation: legalIn 0.18s ease-out;
}
@keyframes legalIn { from { opacity:0; transform: translateY(12px);} to {opacity:1; transform:none;} }
.legal-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 26px; border-bottom: 1px solid var(--border-dim);
  position: sticky; top: 0; background: var(--bg-surface);
}
.legal-head h2 {
  font-family: var(--font-mono); font-size: 1.15rem; color: var(--text-primary);
  margin: 0; font-weight: 600;
}
.legal-close {
  background: none; border: none; font-size: 1.6rem; line-height: 1;
  color: var(--text-dim); cursor: pointer; padding: 0 4px; transition: color var(--t-fast);
}
.legal-close:hover { color: var(--accent); }
.legal-body { padding: 22px 26px 28px; }
.legal-body h3 {
  font-family: var(--font-mono); font-size: 0.9rem; color: var(--text-primary);
  margin: 18px 0 7px; font-weight: 600;
}
.legal-body h3:first-child { margin-top: 0; }
.legal-body p {
  font-size: 0.86rem; line-height: 1.65; color: var(--text-secondary); margin: 0 0 10px;
}
.legal-body .legal-updated {
  font-size: 0.72rem; color: var(--text-dim); font-style: italic; margin-bottom: 16px;
}

/* ══ Shared-core additions: cards/search/related as real links ══ */
a.calc-card, a.related-item, a.sr-item { text-decoration: none; color: inherit; }
a.calc-card { display: flex; }