/* ============================================================
   UnitCalc — Design System
   A premium, utility-first unit conversion website.
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Space+Grotesk:wght@500;600;700&display=swap');

/* --- Custom Properties --- */
:root {
  /* Background */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --bg-input: rgba(255, 255, 255, 0.05);
  --bg-input-focus: rgba(255, 255, 255, 0.08);

  /* Accent Gradient */
  --accent-1: #6366f1;   /* Indigo */
  --accent-2: #8b5cf6;   /* Violet */
  --accent-3: #a78bfa;   /* Light violet */
  --gradient-accent: linear-gradient(135deg, var(--accent-1), var(--accent-2), var(--accent-3));
  --gradient-subtle: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(139,92,246,0.08));

  /* Text */
  --text-primary: #f0f0f5;
  --text-secondary: #8a8a9a;
  --text-tertiary: #55556a;
  --text-accent: var(--accent-3);

  /* Border */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-card: rgba(255, 255, 255, 0.08);
  --border-input: rgba(255, 255, 255, 0.1);
  --border-focus: var(--accent-2);

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
  --shadow-input-focus: 0 0 0 3px rgba(139, 92, 246, 0.2);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Space Grotesk', 'Inter', sans-serif;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 720px;
}

/* --- Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Subtle background pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139, 92, 246, 0.06), transparent);
  pointer-events: none;
  z-index: 0;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; }
input { font-family: inherit; }

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.125rem, 2vw, 1.5rem); }

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.page-wrapper {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Header / Nav --- */
.site-header {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(10, 10, 15, 0.8);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  transition: opacity var(--duration-fast) ease;
}

.site-logo:hover { opacity: 0.8; }

.site-logo svg {
  width: 28px;
  height: 28px;
}

.logo-gradient {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-link {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) ease;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.nav-link.active {
  color: var(--text-primary);
  background: var(--gradient-subtle);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: var(--space-sm);
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    padding: var(--space-md);
    gap: var(--space-xs);
  }
  .nav-links.open { display: flex; }
}

/* --- Glass Card --- */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all var(--duration-normal) var(--ease-out);
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow-card);
}

/* --- Converter Card (Hero Component) --- */
.converter-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.converter-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
}

.converter-fields {
  display: flex;
  align-items: stretch;
  gap: var(--space-lg);
}

@media (max-width: 640px) {
  .converter-fields {
    flex-direction: column;
  }
  .converter-card {
    padding: var(--space-xl);
  }
}

.converter-field {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.converter-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
}

.converter-unit {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-accent);
}

.converter-input {
  width: 100%;
  background: var(--bg-input);
  border: 1.5px solid var(--border-input);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  font-size: 1.75rem;
  font-weight: 600;
  font-family: var(--font-heading);
  color: var(--text-primary);
  transition: all var(--duration-fast) ease;
  outline: none;
  -moz-appearance: textfield;
}

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

.converter-input:focus {
  background: var(--bg-input-focus);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-input-focus);
}

.converter-input::placeholder {
  color: var(--text-tertiary);
  font-weight: 400;
}

/* Swap Button */
.swap-btn-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--space-xl);
}

@media (max-width: 640px) {
  .swap-btn-wrapper {
    padding-top: 0;
  }
}

.swap-btn {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--gradient-subtle);
  border: 1.5px solid var(--border-card);
  color: var(--text-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-normal) var(--ease-bounce);
  flex-shrink: 0;
}

.swap-btn:hover {
  background: var(--gradient-accent);
  color: white;
  transform: rotate(180deg);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
}

.swap-btn:active {
  transform: rotate(180deg) scale(0.92);
}

.swap-btn svg {
  width: 20px;
  height: 20px;
}

/* Formula bar below converter */
.formula-bar {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

.formula-bar code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  background: var(--bg-input);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  color: var(--text-accent);
  font-size: 0.8125rem;
}

/* --- Category Grid --- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-lg);
}

.category-card {
  padding: var(--space-xl);
  text-align: center;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.category-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: width var(--duration-normal) var(--ease-out);
}

.category-card:hover::after {
  width: 60%;
}

.category-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--gradient-subtle);
  color: var(--text-accent);
  font-size: 1.5rem;
  transition: transform var(--duration-normal) var(--ease-bounce);
}

.category-card:hover .category-icon {
  transform: translateY(-2px) scale(1.05);
}

.category-card h3 {
  font-size: 1rem;
  margin-bottom: var(--space-xs);
}

.category-card p {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

/* --- Conversion Links Grid --- */
.conversion-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-md);
}

.conversion-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: all var(--duration-fast) ease;
}

.conversion-link:hover {
  background: var(--bg-card-hover);
  border-color: rgba(139, 92, 246, 0.3);
  transform: translateX(4px);
}

.conversion-link .arrow {
  color: var(--text-accent);
  font-size: 1.25rem;
  transition: transform var(--duration-fast) ease;
}

.conversion-link:hover .arrow {
  transform: translateX(3px);
}

.conversion-link span {
  font-weight: 500;
  font-size: 0.9375rem;
}

.conversion-link .preview {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-family: 'SF Mono', monospace;
  white-space: nowrap;
}

/* --- Reference Table --- */
.ref-table {
  width: 100%;
  border-collapse: collapse;
}

.ref-table th {
  text-align: left;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-accent);
  border-bottom: 1px solid var(--border-card);
}

.ref-table td {
  padding: var(--space-md) var(--space-lg);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

.ref-table tr:last-child td {
  border-bottom: none;
}

.ref-table tr:hover td {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.ref-table td:first-child {
  color: var(--text-primary);
  font-weight: 600;
}

/* --- FAQ Accordion --- */
.faq-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.faq-item {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-item summary {
  padding: var(--space-lg);
  font-weight: 600;
  font-size: 0.9375rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  transition: color var(--duration-fast) ease;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary:hover {
  color: var(--text-accent);
}

.faq-item summary .chevron {
  width: 16px;
  height: 16px;
  color: var(--text-tertiary);
  transition: transform var(--duration-normal) var(--ease-out);
  flex-shrink: 0;
}

.faq-item[open] summary .chevron {
  transform: rotate(180deg);
}

.faq-item .faq-answer {
  padding: 0 var(--space-lg) var(--space-lg);
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Section Spacing --- */
.section {
  padding: var(--space-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  margin-bottom: var(--space-sm);
}

.section-header p {
  max-width: 560px;
  margin: 0 auto;
}

/* Accent text */
.text-accent {
  color: var(--text-accent);
}

.text-gradient {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Hero Section --- */
.hero {
  padding: var(--space-3xl) 0 var(--space-xl);
  text-align: center;
}

.hero h1 {
  margin-bottom: var(--space-md);
}

.hero p {
  font-size: 1.125rem;
  max-width: 520px;
  margin: 0 auto;
}

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  padding: var(--space-lg) 0 0;
}

.breadcrumb a {
  color: var(--text-secondary);
  transition: color var(--duration-fast) ease;
}

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

.breadcrumb .sep {
  color: var(--text-tertiary);
}

/* --- Footer --- */
.site-footer {
  margin-top: auto;
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

.site-footer a {
  color: var(--text-secondary);
  transition: color var(--duration-fast) ease;
}

.site-footer a:hover {
  color: var(--text-accent);
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-md);
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mt-3xl { margin-top: var(--space-3xl); }

.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

.text-center { text-align: center; }

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.animate-in {
  animation: fadeInUp var(--duration-slow) var(--ease-out) both;
}

.animate-in-delay-1 { animation-delay: 80ms; }
.animate-in-delay-2 { animation-delay: 160ms; }
.animate-in-delay-3 { animation-delay: 240ms; }
.animate-in-delay-4 { animation-delay: 320ms; }

/* Result number animation */
.result-flash {
  animation: resultPop var(--duration-fast) var(--ease-bounce);
}

@keyframes resultPop {
  0% { transform: scale(1); }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

/* --- Copy Button --- */
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--duration-fast) ease;
  white-space: nowrap;
}

.copy-btn:hover {
  color: var(--text-accent);
  border-color: var(--accent-2);
  background: var(--gradient-subtle);
}

.copy-btn svg {
  width: 14px;
  height: 14px;
}

.copy-btn.copied {
  color: #34d399;
  border-color: #34d399;
  background: rgba(52, 211, 153, 0.08);
}

/* --- Quick Input Chips --- */
.quick-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
}

.quick-chips-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.quick-chip {
  padding: var(--space-xs) var(--space-md);
  font-size: 0.8125rem;
  font-weight: 600;
  font-family: var(--font-heading);
  color: var(--text-secondary);
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--duration-fast) ease;
}

.quick-chip:hover {
  color: var(--text-primary);
  border-color: var(--accent-2);
  background: var(--gradient-subtle);
  transform: translateY(-1px);
}

.quick-chip:active {
  transform: translateY(0) scale(0.96);
}

/* --- Toast Notification --- */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: var(--space-sm) var(--space-xl);
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent-1);
  border-radius: var(--radius-full);
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.4);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: all var(--duration-normal) var(--ease-out);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* --- Featured Snippet Answer --- */
.instant-answer {
  text-align: center;
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.instant-answer strong {
  color: var(--text-primary);
  font-weight: 700;
}

/* --- Recently Used Section --- */
.recent-section {
  display: none;  /* Hidden until JS populates */
}

.recent-section.has-items {
  display: block;
}

.recent-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-md);
}

/* --- Result Sentence --- */
.result-sentence {
  text-align: center;
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--gradient-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 1.125rem;
  font-weight: 600;
  font-family: var(--font-heading);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--duration-fast) ease;
  position: relative;
}

.result-sentence:hover {
  border-color: var(--accent-2);
  background: rgba(99, 102, 241, 0.1);
}

.result-sentence::after {
  content: 'Click to copy';
  position: absolute;
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  opacity: 0;
  transition: opacity var(--duration-fast) ease;
}

.result-sentence:hover::after {
  opacity: 1;
}

.result-sentence .result-value {
  color: var(--text-accent);
  transition: opacity var(--duration-fast) ease;
}

/* --- Reverse Conversion Link --- */
.reverse-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-accent);
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) ease;
  text-decoration: none;
}

.reverse-link:hover {
  background: var(--gradient-subtle);
  border-color: var(--accent-2);
  transform: translateX(4px);
}

.reverse-link svg {
  width: 16px;
  height: 16px;
}

/* --- Search Bar --- */
.search-wrapper {
  position: relative;
  max-width: 520px;
  margin: var(--space-xl) auto 0;
}

.search-input {
  width: 100%;
  padding: var(--space-md) var(--space-xl);
  padding-left: 3rem;
  font-size: 1rem;
  font-family: var(--font-body);
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1.5px solid var(--border-card);
  border-radius: var(--radius-full);
  outline: none;
  transition: all var(--duration-fast) ease;
}

.search-input:focus {
  background: var(--bg-input-focus);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-input-focus);
}

.search-input::placeholder {
  color: var(--text-tertiary);
}

.search-icon {
  position: absolute;
  left: var(--space-lg);
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-results {
  position: absolute;
  top: calc(100% + var(--space-sm));
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card-hover);
  max-height: 320px;
  overflow-y: auto;
  z-index: 50;
  display: none;
}

.search-results.open {
  display: block;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  font-size: 0.9375rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--duration-fast) ease;
  border-bottom: 1px solid var(--border-subtle);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover,
.search-result-item.active {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.search-result-item .arrow {
  color: var(--text-accent);
}

.search-result-item .preview {
  margin-left: auto;
  font-size: 0.75rem;
  font-family: 'SF Mono', monospace;
  color: var(--text-tertiary);
}

/* --- Number Animation --- */
.converter-input.animating {
  transition: color var(--duration-fast) ease;
}

/* --- Print --- */
@media print {
  body::before { display: none; }
  .site-header, .site-footer, .swap-btn, .quick-chips, .copy-btn, .toast, .search-wrapper, .reverse-link { display: none; }
  .converter-card { box-shadow: none; border: 1px solid #ddd; }
  .converter-input { border: 1px solid #ccc; }
  .glass-card { background: #f9f9f9; border: 1px solid #ddd; }
}