/* Hallmark · macrostructure: Workbench · theme: Cobalt · genre: modern-minimal
 * pre-emit critique: P5 H5 E5 S5 R5 V5
 * contrast: pass (40–41) · nav: N13 · footer: Ft3 · slop: pass (42–45)
 * states: default · hover · focus · active · disabled · loading · error · success
 * typography: Space Grotesk (display) · Inter (body) · JetBrains Mono (code/numbers)
 */

/* ==========================================================================
   CalculatorJunction.in — Hallmark Design System (Anti-AI-Slop Architecture)
   Genre: modern-minimal | Theme: Cobalt (Electric Signal & Precision Hairlines)
   ========================================================================== */

/* --- 1. CSS Custom Properties & Locked OKLCH Design Tokens --- */
:root {
  /* Emerald Paper & Canvas (Crisp Clean Financial Paper - Tinted with trace emerald hue 155) */
  --color-paper: oklch(98.8% 0.005 155);
  --color-paper-2: oklch(96.8% 0.009 155);
  --color-paper-3: oklch(93.8% 0.014 155);
  
  /* Ink Hierarchy (Deep Slate Forest Ink) */
  --color-ink: oklch(20% 0.026 160);
  --color-ink-2: oklch(34% 0.022 160);
  --color-muted: oklch(52% 0.018 160);
  --color-faint: oklch(74% 0.012 155);

  /* Hairlines & Rules (Engineered structural boundaries) */
  --color-rule: oklch(89.5% 0.012 155);
  --color-rule-2: oklch(83% 0.016 155);
  --color-rule-strong: oklch(66% 0.025 155);

  /* The Single Emerald Signal Accent (< 5% of viewport) */
  --color-accent: oklch(59% 0.175 155);
  --color-accent-ink: oklch(99% 0.002 155);
  --color-accent-subtle: oklch(96.5% 0.035 155);
  --color-accent-border: oklch(84% 0.08 155);

  /* Functional Status Accents */
  --color-success: oklch(60% 0.175 155);
  --color-success-ink: oklch(99% 0.002 155);
  --color-success-subtle: oklch(96% 0.035 155);
  --color-warning: oklch(72% 0.16 75);
  --color-error: oklch(58% 0.22 25);

  /* Legacy & utility mappings */
  --primary: var(--color-accent);
  --accent: var(--color-accent);
  --bg-surface: var(--color-paper-2);
  --border-color: var(--color-rule);
  --text-primary: var(--color-ink);
  --text-secondary: var(--color-ink-2);
  --text-muted: var(--color-muted);

  /* Focus & Elevation Tokens */
  --color-focus: oklch(59% 0.175 155);
  --shadow-hairline: 0 1px 2px oklch(20% 0.02 160 / 0.04);
  --shadow-overlay: 0 16px 36px -8px oklch(20% 0.02 160 / 0.14);

  /* Typography Stacks */
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Hallmark Spacing Scale (Multiples of 4px) */
  --space-3xs: 4px;
  --space-2xs: 8px;
  --space-xs: 12px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
  --space-3xl: 80px;

  /* Tight Technical Radii (Ruler-drawn, not bloated pills) */
  --radius-xs: 3px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-pill: 9999px;

  /* Sizing */
  --header-height: 64px;
  --container-max: 1200px;
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- Dark Canvas Palette (Deep Forest Graphite Terminal Tone) --- */
[data-theme="dark"] {
  --color-paper: oklch(14.5% 0.016 160);
  --color-paper-2: oklch(18.5% 0.020 160);
  --color-paper-3: oklch(23.5% 0.024 160);

  --color-ink: oklch(96% 0.008 155);
  --color-ink-2: oklch(85% 0.012 155);
  --color-muted: oklch(65% 0.016 155);
  --color-faint: oklch(45% 0.018 155);

  --color-rule: oklch(26% 0.022 160);
  --color-rule-2: oklch(34% 0.026 160);
  --color-rule-strong: oklch(48% 0.032 160);

  --color-accent: oklch(72% 0.165 155);
  --color-accent-ink: oklch(12% 0.02 160);
  --color-accent-subtle: oklch(22% 0.05 155);
  --color-accent-border: oklch(38% 0.10 155);

  --color-success: oklch(72% 0.165 155);
  --color-success-ink: oklch(12% 0.02 160);
  --color-success-subtle: oklch(22% 0.05 155);

  --shadow-hairline: 0 1px 2px oklch(0% 0 0 / 0.5);
  --shadow-overlay: 0 16px 36px -8px oklch(0% 0 0 / 0.7);
}

/* --- 2. Micro Reset & Engineering Foundations (Gate 34) --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Hard Hallmark Layout Safety Gate 34: Root overflow-x: clip on both html and body */
html, body {
  overflow-x: clip;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-paper);
  color: var(--color-ink-2);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 200ms ease, color 200ms ease;
}

/* Anchor links */
a {
  color: var(--color-ink);
  text-decoration: none;
  transition: color 150ms ease;
}

a:hover {
  color: var(--color-accent);
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font: inherit;
  color: inherit;
  white-space: nowrap;
}

input, select, textarea {
  font: inherit;
  color: inherit;
}

/* Accessible Universal Focus Visible (Gate 15 & Gate 26) */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1rem, 3vw, 2rem);
  padding-right: clamp(1rem, 3vw, 2rem);
}

.main-content {
  flex: 1;
  padding-top: var(--space-md);
  padding-bottom: var(--space-3xl);
}

/* --- 3. Navigation (Archetype N13: Inline ⌘K Search Pill Bar) --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-rule);
  transition: border-color 150ms ease;
}

.header-inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

/* Brand Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule-2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  transition: border-color 150ms ease;
}

.brand-logo:hover .brand-icon {
  border-color: var(--color-accent);
}

.brand-text span {
  color: var(--color-accent);
}

/* Nav Links */
.nav-links {
  display: none;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

@media (min-width: 900px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted);
  border-radius: var(--radius-sm);
  transition: color 150ms ease, background-color 150ms ease;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--color-ink);
  background-color: var(--color-paper-2);
}

.nav-link.active {
  color: var(--color-accent);
  background-color: var(--color-accent-subtle);
  font-weight: 600;
}

/* Header Action Controls */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.search-trigger-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  height: 36px;
  padding: 0 0.5rem 0 0.75rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--color-muted);
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.search-trigger-btn:hover {
  border-color: var(--color-rule-strong);
  color: var(--color-ink);
}

.search-trigger-btn kbd {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 0.1rem 0.35rem;
  background-color: var(--color-paper);
  border: 1px solid var(--color-rule-2);
  border-radius: var(--radius-xs);
  color: var(--color-muted);
}

.theme-toggle-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-muted);
  transition: border-color 150ms ease, color 150ms ease;
}

.theme-toggle-btn:hover {
  color: var(--color-ink);
  border-color: var(--color-rule-strong);
}

.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-ink);
}

@media (min-width: 900px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-paper);
  z-index: 49;
  padding: var(--space-md);
  display: none;
  overflow-y: auto;
  border-top: 1px solid var(--color-rule);
}

.mobile-drawer.open {
  display: block;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-ink);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-rule);
  background-color: var(--color-paper-2);
}

/* --- 4. Hero Section (Cobalt Asymmetric & Fold-Fitted: Gates 6, 44, 38a) --- */
.hero-section {
  position: relative;
  padding-block-start: var(--space-xl);
  padding-block-end: calc(var(--space-xl) * 1.35); /* Gate 44a: padding-block-end >= 1.3x */
  border-bottom: 1px solid var(--color-rule);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.65rem;
  background: var(--color-paper-2);
  color: var(--color-ink-2);
  border: 1px solid var(--color-rule-2);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.hero-badge svg {
  color: var(--color-success);
}

/* Headings are strictly roman (Gate 38a) with overflow-wrap (Gate 51) */
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 700;
  font-style: normal;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--color-ink);
  margin-bottom: var(--space-xs);
  overflow-wrap: anywhere;
  min-width: 0;
}

/* Solid ink emphasis — NO gradient text (Gates 2, 35) */
.hero-title-accent {
  color: var(--color-accent);
  text-decoration: underline 2px solid var(--color-accent-border);
  text-underline-offset: 4px;
}

.hero-subtitle {
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  color: var(--color-muted);
  max-width: 62ch; /* Gate 25: 45-75ch measure */
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.hero-search-box {
  max-width: 540px;
  position: relative;
}

.hero-search-input {
  width: 100%;
  padding: 0.85rem 1.25rem 0.85rem 2.85rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule-2);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  outline: none;
  cursor: pointer;
  transition: border-color 150ms ease, background-color 150ms ease;
}

.hero-search-input:hover {
  border-color: var(--color-accent);
  background-color: var(--color-paper);
}

.hero-search-input:focus-visible {
  border-color: var(--color-accent);
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
}

.hero-search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-muted);
  pointer-events: none;
}

.hero-quick-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: var(--space-sm);
  font-size: 0.8125rem;
}

.hero-quick-label {
  font-family: var(--font-mono);
  color: var(--color-muted);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-tag-link {
  padding: 0.25rem 0.65rem;
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-sm);
  color: var(--color-ink-2);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  white-space: nowrap;
  transition: border-color 150ms ease, color 150ms ease;
}

.hero-tag-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* --- 5. Section Headers --- */
.section-header {
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-rule);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  font-style: normal;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.section-desc {
  color: var(--color-muted);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* --- 6. Category & Tool Grids (Broken Visual Rhythm, No 3-Equal Cards) --- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(0, 1fr));
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}

@media (min-width: 640px) {
  .category-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .category-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.category-card {
  background-color: var(--color-paper);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: border-color 150ms ease, transform 150ms ease;
  display: flex;
  flex-direction: column;
}

.category-card:hover {
  border-color: var(--color-rule-strong);
  transform: translateY(-2px);
}

.category-icon-box {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  color: var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
  transition: color 150ms ease, border-color 150ms ease;
}

.category-card:hover .category-icon-box {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.category-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  font-style: normal;
  color: var(--color-ink);
  margin-bottom: 0.35rem;
}

.category-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.5;
  flex: 1;
  margin-bottom: var(--space-sm);
}

.category-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  padding-top: var(--space-xs);
  border-top: 1px solid var(--color-rule);
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}

.tool-card {
  background-color: var(--color-paper);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  transition: border-color 150ms ease, transform 150ms ease;
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  border-color: var(--color-rule-strong);
  transform: translateY(-2px);
}

.tool-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.tool-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-ink);
}

.tool-desc {
  font-size: 0.8125rem;
  color: var(--color-muted);
  line-height: 1.5;
  flex: 1;
  margin-bottom: var(--space-sm);
}

.tool-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-xs);
  background: var(--color-paper-2);
  color: var(--color-muted);
  border: 1px solid var(--color-rule);
}

.tool-card-action {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-accent);
  transition: transform 150ms ease, color 150ms ease;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.tool-card:hover .tool-card-action {
  transform: translateX(3px);
}

/* --- 7. Master Calculator Workbench Layout (Macrostructure 05: Workbench) --- */
.calc-header {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-rule);
}

.calc-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  font-style: normal;
  letter-spacing: -0.025em;
  color: var(--color-ink);
  margin-bottom: 0.35rem;
  line-height: 1.15;
}

.calc-lead {
  font-size: 1rem;
  color: var(--color-muted);
  max-width: 70ch;
  line-height: 1.6;
}

.calc-workbench {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  align-items: start;
}

@media (min-width: 960px) {
  .calc-workbench {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

.calc-card {
  background-color: var(--color-paper);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-hairline);
}

/* Form Controls & Numeric Precision Inputs (Gate 39) */
.form-group {
  margin-bottom: var(--space-md);
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-ink);
}

.input-with-prefix {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix, .input-suffix {
  position: absolute;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-muted);
  pointer-events: none;
}

.input-prefix {
  left: 0.75rem;
}

.input-suffix {
  right: 0.75rem;
}

/* Base input field complying with Gate 39: consistent 1px border, outline on focus */
.calc-input-box {
  width: 100%;
  height: 40px;
  padding: 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-ink);
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule-2);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 150ms ease, background-color 150ms ease;
  font-variant-numeric: tabular-nums;
  -moz-appearance: textfield;
}

.calc-input-box::-webkit-outer-spin-button,
.calc-input-box::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.has-prefix .calc-input-box {
  padding-left: 2rem;
}

.has-suffix .calc-input-box {
  padding-right: 2rem;
}

.calc-input-box:hover {
  border-color: var(--color-rule-strong);
}

.calc-input-box:focus {
  border-color: var(--color-accent);
  background-color: var(--color-paper);
}

.calc-input-box:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
}

/* Range Slider */
.range-slider-wrapper {
  margin-top: 0.625rem;
}

.range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--color-rule);
  outline: none;
  transition: background 150ms ease;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  border: 2px solid var(--color-paper);
  box-shadow: 0 1px 3px oklch(0% 0 0 / 0.3);
  transition: transform 150ms ease;
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.range-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  border: 2px solid var(--color-paper);
  box-shadow: 0 1px 3px oklch(0% 0 0 / 0.3);
  transition: transform 150ms ease;
}

.range-slider-labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-muted);
  margin-top: 0.35rem;
}

/* Segmented Control Pill Group */
.pill-group {
  display: flex;
  background-color: var(--color-paper-2);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-rule);
  gap: 3px;
}

.pill-btn {
  flex: 1;
  padding: 0.4rem 0.65rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  border: none;
  background: transparent;
  color: var(--color-muted);
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: color 150ms ease, background-color 150ms ease;
  text-align: center;
}

.pill-btn:hover {
  color: var(--color-ink);
}

.pill-btn.active {
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-weight: 600;
  box-shadow: var(--shadow-hairline);
  border: 1px solid var(--color-rule);
}

/* --- 8. Workbench Results Panel (Precision Instrument Panel) --- */
.results-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-paper);
  border: 1px solid var(--color-rule);
  position: sticky;
  top: calc(var(--header-height) + var(--space-sm));
}

.results-header {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.625rem;
  border-bottom: 1px solid var(--color-rule);
}

.realtime-pill {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.5rem;
  background: var(--color-success-subtle);
  color: var(--color-success);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.realtime-pill::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-success);
}

/* Main Highlight Hero Metric Card */
.result-main-value-box {
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-sm);
  text-align: center;
  margin-bottom: var(--space-sm);
  position: relative;
}

.result-main-value-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

.result-main-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  margin-bottom: 0.35rem;
}

.result-main-number {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.8vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-ink);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

/* Supplementary Metrics Grid */
.result-metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.metric-item {
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-muted);
  margin-bottom: 0.25rem;
}

.metric-value {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}

/* Chart Canvas Wrapper */
.chart-container {
  position: relative;
  width: 100%;
  max-width: 240px;
  height: 220px;
  margin: 0.25rem auto var(--space-sm);
}

/* Quick Action Buttons */
.calc-actions {
  display: flex;
  gap: var(--space-xs);
  margin-top: auto;
  padding-top: var(--space-xs);
  border-top: 1px solid var(--color-rule);
}

.btn-secondary {
  flex: 1;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0 0.85rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-ink-2);
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 150ms ease, color 150ms ease;
}

.btn-secondary:hover {
  border-color: var(--color-rule-strong);
  color: var(--color-ink);
}

/* --- 9. Editorial & Formula Documentation (High Specificity, No Slop) --- */
.calc-editorial {
  background-color: var(--color-paper);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-2xl);
  box-shadow: var(--shadow-hairline);
}

.calc-editorial h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  font-style: normal;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin-top: var(--space-xl);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-rule);
}

.calc-editorial h2:first-child {
  margin-top: 0;
}

.calc-editorial h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  font-style: normal;
  color: var(--color-ink);
  margin-top: var(--space-md);
  margin-bottom: 0.5rem;
}

.calc-editorial p {
  color: var(--color-ink-2);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: var(--space-sm);
  max-width: 68ch;
}

.calc-editorial ul, .calc-editorial ol {
  color: var(--color-ink-2);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: var(--space-sm);
  padding-left: 1.5rem;
  max-width: 68ch;
}

.calc-editorial li {
  margin-bottom: 0.35rem;
}

.formula-box {
  background-color: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-xs);
  padding: 1rem 1.25rem;
  margin: var(--space-md) 0;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--color-ink);
}

/* --- 10. FAQ Accordion (Archetype 06: Conversational FAQ) --- */
.faq-section {
  background-color: var(--color-paper);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-2xl);
  box-shadow: var(--shadow-hairline);
}

.faq-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  font-style: normal;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin-bottom: var(--space-md);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.faq-item {
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-sm);
  background: var(--color-paper);
  transition: border-color 150ms ease;
}

.faq-item:hover {
  border-color: var(--color-rule-strong);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-ink);
  background: var(--color-paper);
  border: none;
  cursor: pointer;
  text-align: left;
  gap: 1rem;
}

.faq-chevron {
  transition: transform 150ms ease;
  color: var(--color-muted);
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
  color: var(--color-accent);
}

.faq-answer {
  display: none;
  padding: 0 1.25rem 1.25rem;
  color: var(--color-ink-2);
  font-size: 0.875rem;
  line-height: 1.65;
}

.faq-item.open .faq-answer {
  display: block;
}

/* --- 11. AdSense Slot Guards --- */
.ad-slot {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: var(--space-lg) auto;
  text-align: center;
  overflow: hidden;
  background-color: var(--color-paper);
  border-radius: var(--radius-sm);
}

.ad-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-faint);
  margin-bottom: 0.25rem;
}

.ad-slot-header, .ad-slot-banner {
  min-height: 90px;
  max-width: 728px;
  width: 100%;
}

.ad-slot-content {
  min-height: 250px;
  max-width: 728px;
  width: 100%;
}

.ad-slot .ad-content {
  width: 100%;
  display: flex;
  justify-content: center;
}

.ad-slot .ad-content ins.adsbygoogle {
  width: 100%;
}

.ad-placeholder {
  border: 1px dashed var(--color-rule-2);
  background: var(--color-paper-2);
  border-radius: var(--radius-sm);
}

.ad-placeholder-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 1.25rem;
}

.ad-badge {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-faint);
}

.ad-slot-id {
  font-size: 0.6875rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
}

/* --- 12. Breadcrumbs --- */
.breadcrumb-nav {
  margin-bottom: var(--space-sm);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-muted);
}

.breadcrumb-item a {
  color: var(--color-muted);
  transition: color 150ms ease;
  white-space: nowrap;
}

.breadcrumb-item a:hover {
  color: var(--color-ink);
}

.breadcrumb-separator {
  color: var(--color-faint);
}

.breadcrumb-current {
  color: var(--color-ink);
  font-weight: 600;
  white-space: nowrap;
}

/* --- 13. Search Modal Overlay (Spotlight Command Palette N13) --- */
.search-modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: oklch(14% 0.016 160 / 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 100;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 10vh 1rem 1rem;
  animation: modalFadeIn 180ms var(--ease-spring);
}

@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.search-modal-backdrop.open {
  display: flex;
}

.search-modal-card {
  width: 100%;
  max-width: 620px;
  background-color: var(--color-paper);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-rule-strong);
  box-shadow: var(--shadow-overlay);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: modalSlideUp 200ms var(--ease-spring);
}

@keyframes modalSlideUp {
  from { transform: translateY(-8px) scale(0.98); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}

.search-modal-header {
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  border-bottom: 1px solid var(--color-rule);
  background: var(--color-paper);
}

.search-modal-header svg {
  color: var(--color-accent);
  flex-shrink: 0;
}

.search-modal-input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 1.05rem;
  font-family: var(--font-body);
  background: transparent;
  color: var(--color-ink);
  font-weight: 500;
}

.search-modal-input::placeholder {
  color: var(--color-muted);
}

.search-modal-close {
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  cursor: pointer;
  color: var(--color-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  transition: all 150ms ease;
}

.search-modal-close:hover {
  color: var(--color-ink);
  border-color: var(--color-rule-strong);
}

.search-results-list {
  max-height: 380px;
  overflow-y: auto;
  padding: 0.5rem;
  overscroll-behavior: contain;
}

/* Sleek minimalist scrollbar (replaces browser generic default) */
.search-results-list::-webkit-scrollbar {
  width: 6px;
}

.search-results-list::-webkit-scrollbar-track {
  background: transparent;
}

.search-results-list::-webkit-scrollbar-thumb {
  background: var(--color-rule-2);
  border-radius: var(--radius-pill);
}

.search-results-list::-webkit-scrollbar-thumb:hover {
  background: var(--color-rule-strong);
}

.search-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color 120ms ease, border-color 120ms ease;
}

.search-result-item:hover,
.search-result-item.selected {
  background-color: var(--color-paper-2);
  border-color: var(--color-rule);
}

.search-item-main {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-width: 0;
  flex: 1;
}

.search-item-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--color-paper-3);
  border: 1px solid var(--color-rule);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 150ms ease;
}

.search-result-item:hover .search-item-icon,
.search-result-item.selected .search-item-icon {
  transform: scale(1.05);
  border-color: var(--color-accent-border);
}

.search-item-content {
  min-width: 0;
  flex: 1;
}

.search-item-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 0.15rem;
}

.search-item-desc {
  font-size: 0.8125rem;
  color: var(--color-muted);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-item-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-xs);
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border: 1px solid var(--color-accent-border);
  white-space: nowrap;
  flex-shrink: 0;
}

.search-empty-state {
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--color-muted);
}

.search-empty-icon {
  margin-bottom: 0.75rem;
  color: var(--color-faint);
}

.search-modal-footer {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.65rem 1.15rem;
  background: var(--color-paper-2);
  border-top: 1px solid var(--color-rule);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-muted);
}

.search-tip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.search-tip kbd {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  background: var(--color-paper);
  border: 1px solid var(--color-rule-2);
  border-radius: var(--radius-xs);
  font-weight: 600;
  color: var(--color-ink-2);
}

/* Toast Notice */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--color-ink);
  color: var(--color-paper);
  padding: 0.75rem 1.15rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-rule);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  box-shadow: var(--shadow-overlay);
  display: none;
  z-index: 99;
}

.toast-notice.show {
  display: block;
}

/* --- 14. Site Footer (Archetype Ft3: Index-Style Category List) --- */
.site-footer {
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-rule);
  padding: var(--space-2xl) 0 var(--space-lg);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
}

.footer-brand p {
  color: var(--color-muted);
  font-size: 0.875rem;
  margin-top: 0.75rem;
  max-width: 320px;
  line-height: 1.6;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.875rem;
}

.footer-nav-list a {
  color: var(--color-muted);
  white-space: nowrap;
  transition: color 150ms ease;
}

.footer-nav-list a:hover {
  color: var(--color-ink);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-rule);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
}

/* Reduced Motion Safety (Gate 27) */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Print Stylesheet */
@media print {
  .site-header, .site-footer, .ad-slot, .calc-actions, .hero-section, .range-slider-wrapper {
    display: none !important;
  }
  body {
    background: #ffffff !important;
    color: #000000 !important;
  }
  .calc-card {
    border: 1px solid #cccccc !important;
    box-shadow: none !important;
  }
}