/* ── Optimized Grid System ── */
.all-calculators-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0 3rem 0;
}

.calculator-grid-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  background: var(--surface-container-low);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-decoration: none;
  transition: var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.calculator-grid-item:hover {
  background: var(--surface-container-high);
  border-color: var(--primary-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.calculator-grid-item-icon {
  font-size: 1.75rem;
  color: var(--primary);
  margin-bottom: 0.25rem;
  transition: var(--transition);
}

.calculator-grid-item:hover .calculator-grid-item-icon {
  transform: scale(1.1) rotate(-5deg);
}

.calculator-grid-item-name {
  font-family: var(--font-headline);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--on-surface);
}

.calculator-grid-item-tagline {
  font-size: 0.8rem;
  color: var(--on-surface-variant);
  line-height: 1.4;
}

/* Category Header for Grid */
.category-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.category-header-icon {
  color: var(--primary);
  font-size: 1.2rem;
}
.category-header-title {
  font-family: var(--font-headline);
  font-size: 0.9rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--on-surface-variant);
}

/* ═══════════════════════════════════════════════════════════════
   CALC-GRID DESIGN SYSTEM
   PrecisionCalc aesthetic · Material Design 3 tokens
   Green/Black · Manrope headlines · Inter body
   ═══════════════════════════════════════════════════════════════ */

/* ── Design Tokens ─────────────────────────────────────────── */
:root {
  /* Surfaces */
  --surface:             #0e0e0e;
  --surface-dim:         #0e0e0e;
  --surface-container-lowest: #000000;
  --surface-container-low:    #131313;
  --surface-container:        #1a1a1a;
  --surface-container-high:   #20201f;
  --surface-container-highest:#262626;
  --surface-bright:           #2c2c2c;

  /* Brand */
  --primary:             #3fff8b;
  --primary-dim:         #24f07e;
  --primary-glow:        rgba(63, 255, 139, 0.20);
  --primary-glow-lg:     rgba(63, 255, 139, 0.08);
  --on-primary:          #005d2c;
  --primary-container:   #13ea79;

  /* Secondary (blue) */
  --secondary:           #6e9bff;
  --secondary-container: #0058ca;
  --on-secondary:        #001d4e;

  /* Tertiary (cyan) */
  --tertiary:            #7ae6ff;

  /* Text */
  --on-surface:          #ffffff;
  --on-surface-variant:  #adaaaa;
  --on-background:       #ffffff;

  /* Borders */
  --outline:             #767575;
  --outline-variant:     #484847;

  /* Semantic */
  --success:             #3fff8b;
  --warning:             #fbbf24;
  --danger:              #ff716c;

  /* Typography */
  --font-headline: 'Manrope', system-ui, sans-serif;
  --font-body:     'Inter', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', monospace;

  /* Layout */
  --topbar-h:     64px;
  --sidebar-w:    256px;
  --ad-rail-w:    320px;
  --bottom-nav-h: 72px;
  --ad-banner-h:  104px; /* label + slot */

  /* Radius */
  --radius-sm:    6px;
  --radius-md:    12px;
  --radius-lg:    18px;
  --radius-xl:    24px;
  --radius-pill:  100px;

  /* Shadows */
  --shadow-card:  0 1px 0 rgba(255,255,255,0.04) inset, 0 8px 40px rgba(0,0,0,0.5);
  --shadow-glow:  0 0 32px var(--primary-glow), 0 8px 40px rgba(0,0,0,0.5);
  --shadow-topbar: 0 -1px 0 rgba(255,255,255,0.04) inset, 0 8px 30px rgba(0,0,0,0.5);

  --transition: all 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family:  var(--font-body);
  background:   var(--surface);
  color:        var(--on-surface);
  min-height:   100dvh;
  overflow-x:   hidden;
  padding-bottom: var(--bottom-nav-h);
}
a   { text-decoration: none; color: inherit; }
button { cursor: pointer; font-family: var(--font-body); border: none; background: none; }
input, select { font-family: var(--font-body); }

/* Material Symbols base */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  user-select: none;
}

/* Scrollbar */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(63,255,139,0.2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-dim); }

/* ══════════════════════════════════════════════════════════════
   TOP BAR
   ══════════════════════════════════════════════════════════════ */
.topbar {
  position:     fixed;
  top:          0; left: 0; right: 0;
  z-index:      100;
  height:       var(--topbar-h);
  display:      flex;
  align-items:  center;
  gap:          16px;
  padding:      0 24px;
  background:   rgba(14, 14, 14, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  box-shadow:   var(--shadow-topbar);
}

/* Brand */
.brand {
  display:    flex;
  align-items: center;
  gap:         8px;
  flex-shrink: 0;
  cursor:      pointer;
}
.brand-icon {
  color:       var(--primary);
  font-size:   1.4rem;
}
.brand-text {
  font-family:   var(--font-headline);
  font-size:     1.3rem;
  font-weight:   800;
  letter-spacing: -0.05em;
  color:         var(--on-surface);
  transition: var(--transition);
}
.brand:hover .brand-text {
    color: var(--primary);
}


/* Topbar search (desktop) */
.topbar-search {
  flex:        1;
  max-width:   480px;
  position:    relative;
  display:     none; /* shown at md+ */
}
.search-icon-el {
  position:   absolute;
  left:       12px;
  top:        50%;
  transform:  translateY(-50%);
  color:      var(--on-surface-variant);
  font-size:  1.2rem;
  pointer-events: none;
}

/* Shared search input style */
.search-input {
  width:         100%;
  height:        42px;
  padding:       0 16px 0 42px;
  background:    var(--surface-container-high);
  border:        1px solid transparent;
  border-radius: var(--radius-pill);
  color:         var(--on-surface);
  font-size:     0.9rem;
  outline:       none;
  transition:    var(--transition);
}
.search-input:focus {
  border-color:  var(--primary-dim);
  background:    var(--surface-container);
  box-shadow:    0 0 0 3px var(--primary-glow);
}
.search-input::placeholder { color: var(--on-surface-variant); }
.search-input::-webkit-search-cancel-button { display: none; }

/* Topbar nav */
.topbar-nav {
  display:   none;
  gap:       4px;
  flex-shrink: 0;
}
.topbar-link {
  padding:       6px 14px;
  border-radius: var(--radius-pill);
  font-size:     0.82rem;
  font-weight:   600;
  color:         var(--on-surface-variant);
  transition:    var(--transition);
}
.topbar-link:hover { color: var(--primary); background: var(--primary-glow-lg); }

/* Mobile buttons */
.mobile-menu-btn,
.mobile-search-btn {
  width:  40px; height: 40px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color:   var(--primary);
  transition: var(--transition);
  flex-shrink: 0;
}
.mobile-menu-btn:hover,
.mobile-search-btn:hover { background: var(--primary-glow-lg); }
.mobile-search-btn { margin-left: auto; }

/* ── Mobile Search Overlay ──────────────────────────────────  */
.mobile-search-overlay {
  position: fixed;
  top: var(--topbar-h);
  left: 0; right: 0;
  background: var(--surface-container-low);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  z-index: 200;
  padding: 12px 16px;
}
.mobile-search-overlay[hidden] { display: none; }
.mobile-search-inner {
  display:    flex;
  align-items: center;
  gap:         8px;
  background: var(--surface-container);
  border-radius: var(--radius-lg);
  padding: 0 14px;
}
.mobile-search-inner .material-symbols-outlined { color: var(--primary); flex-shrink: 0; }
.mobile-search-inner .search-input {
  border-radius: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0 8px;
  height: 48px;
}
.mobile-search-inner .search-input:focus { box-shadow: none; border-color: transparent; }
.mobile-search-close { color: var(--on-surface-variant); display: flex; align-items: center; }

/* ── Search Dropdown ────────────────────────────────────────  */
.search-dropdown {
  position:   absolute;
  top:        calc(100% + 8px);
  left:       0; right: 0;
  background: var(--surface-container);
  border:     1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow:   hidden;
  z-index:    300;
}
.search-dropdown[hidden] { display: none; }
.mobile-search-overlay .search-dropdown { position: static; margin-top: 8px; }

.search-result-item {
  display:    flex;
  align-items: center;
  gap:         12px;
  padding:     12px 16px;
  cursor:      pointer;
  font-size:   0.92rem;
  transition:  var(--transition);
  width: 100%;
  overflow: hidden;
}
.search-result-item:hover,
.search-result-item.focused {
  background: var(--surface-container-high);
  color:      var(--primary);
}
.result-icon { font-size: 1.25rem; width: 24px; text-align: center; flex-shrink: 0; }
.search-result-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.search-result-cat { 
  font-size: 0.68rem; 
  color: var(--on-surface-variant); 
  flex-shrink: 0;
  background: var(--surface-container-highest);
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* ══════════════════════════════════════════════════════════════
   AD ZONES (fixed heights = Zero CLS)
   ══════════════════════════════════════════════════════════════ */
.ad-zone {
  display:        flex;
  flex-direction: column;
  align-items:    center;
  gap:            4px;
}
.ad-zone-multiplex {
  padding: 16px;
  background: var(--surface-container-low);
  border-radius: var(--radius-lg);
  border: 1px solid var(--outline-variant);
  margin: 32px 0 48px !important;
  width: 100%;
  min-height: 250px;
}

.ad-label {
  font-size:      0.62rem;
  font-weight:    700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color:          var(--outline);
  opacity:        0.7;
}
.ad-zone-a {
  padding: 10px 24px 6px;
  background: rgba(0,0,0,0.3);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.ad-zone-inline {
  padding: 10px 0;
  margin: 24px 0;
}

/* Sponsored Apps (Professional Look) */
.partner-apps {
  margin: 16px 0 32px;
  width: 100%;
}
.partner-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  width: 100%;
}
.partner-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 32px 20px 24px;
  background: var(--surface-container-low);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-xl);
  text-decoration: none;
  transition: var(--transition);
  overflow: hidden;
  min-height: 220px;
}
.partner-card:hover {
  background: var(--surface-container);
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.3);
}
.partner-ribbon {
  position: absolute;
  top: 12px;
  right: -32px;
  background: var(--primary);
  color: var(--on-primary);
  padding: 4px 40px;
  font-size: 0.65rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transform: rotate(45deg);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.partner-title {
  font-family: var(--font-headline);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--on-surface);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.partner-asset {
  margin-bottom: 20px;
  color: var(--primary);
  background: var(--surface-container-high);
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  transition: var(--transition);
}
.partner-card:hover .partner-asset {
  transform: scale(1.1);
  background: var(--primary-fixed-dim);
  color: var(--on-primary-fixed);
}
.partner-desc {
  font-size: 0.85rem;
  color: var(--on-surface-variant);
  line-height: 1.4;
  font-weight: 500;
}
.partner-asset img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}


/* Global Partner Apps (Legacy - removed from top) */
.partner-apps-global { display: none; }

.partner-apps-sidebar .partner-grid {
  grid-template-columns: 1fr;
  gap: 16px;
}
.partner-apps-sidebar .partner-card {
  padding: 24px 20px;
  min-height: auto;
}

/* Bento Sponsor Column (part of featured-grid) */
.feature-sponsor-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.feature-sponsor-column .partner-card {
  padding: 24px 16px;
  min-height: auto;
  flex: 1;
}

/* Multiplex In-Grid Partner Ads */
.partner-apps-multiplex .partner-grid {
  justify-content: center;
  max-width: 600px;
  margin: 0 auto;
}
.partner-apps-multiplex .partner-card {
  max-width: 400px;
  margin: 0 auto;
  border: 1px solid var(--primary-glow);
}

@media (max-width: 600px) {
  .partner-grid { grid-template-columns: 1fr; }
}

/* ─── Sidebar History Items ────────────────────────────────── */
.sidebar-history-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 8px;
}
.sidebar-history-item {
  background: var(--surface-container);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  padding: 12px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sidebar-history-item:hover {
  background: var(--surface-container-high);
  border-color: var(--primary-glow);
  transform: translateY(-1px);
}
.history-item-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.history-tool-name {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
  letter-spacing: 0.05em;
}
.history-time {
  font-size: 0.65rem;
  color: var(--on-surface-variant);
}
.history-item-value {
  font-family: var(--font-headline);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--on-surface);
}
.history-item-label {
  font-size: 0.75rem;
  color: var(--on-surface-variant);
  font-weight: 500;
}


.ad-slot {
  background: rgba(255,255,255,0.015);
  border:     1px dashed rgba(255,255,255,0.07);
  border-radius: var(--radius-sm);
  display:    flex;
  align-items: center;
  justify-content: center;
  color:      var(--on-surface-variant);
  font-size:  0.72rem;
  overflow:   hidden;
  min-height: 90px; /* Ensures no CLS on ad load */
}
.ad-slot-leaderboard { width: 728px; height: 90px; max-width: 100%; }
.ad-slot-skyscraper  { width: 300px; height: 600px; }
.ad-slot-native      { width: 100%;  height: 280px; }
.ad-slot-footer      { width: 728px; height: 90px;  max-width: 100%; }

/* ══════════════════════════════════════════════════════════════
   APP SHELL (3-column grid on desktop)
   ══════════════════════════════════════════════════════════════ */
.app-shell {
  display:   flex;
  margin-top: var(--topbar-h);
  min-height: calc(100dvh - var(--topbar-h));
}

/* ── Left Sidebar ───────────────────────────────────────────  */
.sidebar {
  width:     var(--sidebar-w);
  flex-shrink: 0;
  position:  sticky;
  top:       var(--topbar-h);
  height:    calc(100dvh - var(--topbar-h));
  overflow-y: auto;
  border-right: 1px solid rgba(255,255,255,0.05);
  background: var(--surface);
  /* Hidden on mobile — slides in */
  transform: translateX(-100%);
  position:  fixed;
  left:      0;
  top:       var(--topbar-h);
  z-index:   90;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar.open { transform: translateX(0); }

.sidebar-inner {
  padding:  20px 12px 32px;
  display:  flex;
  flex-direction: column;
  gap:      4px;
}
.sidebar-section-label {
  font-size:     0.65rem;
  font-weight:   800;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color:         var(--primary);
  padding:       4px 10px 12px;
}
.sidebar-section { margin-bottom: 8px; }
.sidebar-section-title {
  font-size:     0.7rem;
  font-weight:   700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color:         var(--on-surface-variant);
  padding:       8px 10px 4px;
  display:       block;
}
.sidebar-items { display: flex; flex-direction: column; gap: 1px; }
.sidebar-empty {
  font-size:  0.8rem;
  color:      var(--on-surface-variant);
  padding:    6px 12px;
  opacity:    0.6;
}
.sidebar-item {
  display:    flex;
  align-items: center;
  gap:         10px;
  padding:     9px 12px;
  border-radius: var(--radius-sm);
  color:       var(--on-surface-variant);
  font-size:   0.875rem;
  font-weight: 500;
  transition:  var(--transition);
  border-left: 3px solid transparent;
}
.sidebar-item:hover {
  background: var(--surface-container-low);
  color:      var(--on-surface);
}
.sidebar-item.active {
  background:  rgba(63,255,139,0.08);
  color:       var(--primary);
  border-left-color: var(--primary);
  font-weight: 700;
}
.sidebar-item-icon { font-size: 1rem; width: 20px; }

/* Backdrop (mobile) */
.sidebar-backdrop {
  position:   fixed;
  inset:      0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index:    80;
}
.sidebar-backdrop[hidden] { display: none; }

/* ── Main Content ───────────────────────────────────────────  */
.main-content {
  flex:       1;
  min-width:  0;
  padding:    0 24px 40px;
}

/* ── Right Ad Rail ──────────────────────────────────────────  */
.ad-rail {
  display:    none; /* shown at xl+ */
  width:      var(--ad-rail-w);
  flex-shrink: 0;
  padding:    24px 20px;
  position:   sticky;
  top:        var(--topbar-h);
  height:     calc(100dvh - var(--topbar-h));
  overflow-y: auto;
  border-left: 1px solid rgba(255,255,255,0.05);
}

/* ══════════════════════════════════════════════════════════════
   HOME SCREEN
   ══════════════════════════════════════════════════════════════ */
.home-screen { padding: 32px 0; }

/* Hero */
.hero {
  position:  relative;
  padding:   40px 0 36px;
  /* overflow:  hidden; <-- REMOVED this to prevent clipping search dropdown */
  z-index:   10;
}
.hero-glow {
  position:  absolute;
  top:       -60px; left: -80px;
  width:     320px; height: 320px;
  background: var(--primary-glow-lg);
  filter:    blur(80px);
  border-radius: 50%;
  pointer-events: none;
}
.hero-text { position: relative; z-index: 1; margin-bottom: 28px; }
.hero-title {
  font-family:   var(--font-headline);
  font-size:     clamp(2.2rem, 5vw, 4rem);
  font-weight:   800;
  letter-spacing: -0.04em;
  line-height:   1.1;
  color:         var(--on-surface);
  margin-bottom: 12px;
}
.hero-accent { color: var(--primary); font-style: italic; }
.hero-sub {
  font-size:  1rem;
  color:      var(--on-surface-variant);
  max-width:  480px;
  line-height: 1.6;
}

/* Hero search (visible only on mobile) */
.hero-search {
  position:  relative;
  max-width: 560px;
  display:   block;
}
.hero-search-icon {
  position:  absolute;
  left:      14px; top: 50%;
  transform: translateY(-50%);
  color:     var(--primary);
  pointer-events: none;
}
.hero-search-input { padding-left: 46px; height: 52px; font-size: 1rem; border-radius: var(--radius-lg); }

/* Section headers */
.section-header {
  display:    flex;
  justify-content: space-between;
  align-items: flex-end;
  margin:     32px 0 16px;
}
.section-eyebrow {
  font-size:     0.7rem;
  font-weight:   800;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color:         var(--primary);
  display:       block;
  margin-bottom: 4px;
}
.section-title {
  font-family:   var(--font-headline);
  font-size:     1.5rem;
  font-weight:   800;
  letter-spacing: -0.03em;
}
.section-sub { font-size: 0.85rem; color: var(--on-surface-variant); margin-top: 2px; }
.section-link {
  font-size:  0.8rem;
  color:      var(--on-surface-variant);
  font-weight: 600;
  transition: var(--transition);
  display:    flex;
  align-items: center;
  gap:         4px;
}
.section-link:hover { color: var(--primary); }

/* ══════════════════════════════════════════════════════════════
   FEATURED GRID (Asymmetric)
   ══════════════════════════════════════════════════════════════ */
.featured-grid {
  display:               grid;
  grid-template-columns: 1fr;
  gap:                   16px;
}

/* Large feature card */
.feature-card-large {
  position:   relative;
  background: var(--surface-container);
  border-radius: var(--radius-lg);
  padding:    32px;
  overflow:   hidden;
  display:    flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 280px;
  transition: var(--transition-slow);
  border:     1px solid rgba(255,255,255,0.04);
}
.feature-card-large:hover {
  background: var(--surface-container-high);
  box-shadow: var(--shadow-glow);
  border-color: rgba(63,255,139,0.2);
}
.feature-card-accent-bar {
  position:   absolute;
  left:       0; top: 0; bottom: 0;
  width:      3px;
  background: var(--primary);
  opacity:    0;
  transition: var(--transition-slow);
}
.feature-card-large:hover .feature-card-accent-bar { opacity: 1; }
.feature-card-watermark {
  position: absolute;
  top: 10%;
  right: -5%;
  width: 280px;
  height: 120px;
  background: url('logo.png') center/contain no-repeat;
  opacity: 0.05;
  filter: grayscale(1) brightness(3);
  pointer-events: none;
  transition: var(--transition-slow);
  transform: rotate(-12deg);
}
.feature-card-large:hover .feature-card-watermark {
  opacity: 0.12;
  transform: scale(1.1) rotate(-8deg);
  filter: grayscale(0) brightness(1.5);
}
.feature-card-content { position: relative; z-index: 1; }
.feature-badge {
  display:       inline-block;
  padding:       3px 10px;
  border-radius: var(--radius-pill);
  background:    var(--primary-glow);
  color:         var(--primary);
  font-size:     0.65rem;
  font-weight:   800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.feature-card-title {
  font-family:   var(--font-headline);
  font-size:     1.6rem;
  font-weight:   800;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}
.feature-card-desc {
  font-size:  0.9rem;
  color:      var(--on-surface-variant);
  line-height: 1.6;
  margin-bottom: 20px;
  max-width:  420px;
}
.feature-cta {
  display:    inline-flex;
  align-items: center;
  gap:         6px;
  background: var(--primary);
  color:      var(--on-primary);
  font-size:  0.82rem;
  font-weight: 800;
  padding:    10px 20px;
  border-radius: var(--radius-lg);
  letter-spacing: 0.04em;
  transition: var(--transition);
}
.feature-card-large:hover .feature-cta { transform: translateX(2px); }

/* Side cards grid */
.feature-side-grid {
  display:               grid;
  grid-template-columns: 1fr;
  gap:                   12px;
}
.feature-side-card {
  position:   relative;
  background: var(--surface-container-low);
  border-radius: var(--radius-md);
  padding:    20px;
  display:    flex;
  align-items: center;
  gap:         16px;
  transition: var(--transition);
  border:     1px solid rgba(255,255,255,0.04);
  overflow:   hidden;
}
.feature-side-card:hover {
  background: var(--surface-container-high);
  color:      var(--on-surface);
}
.feature-side-left-bar {
  position:   absolute;
  left:       0; top: 50%;
  transform:  translateY(-50%);
  width:      3px; height: 32px;
  background: var(--secondary);
  border-radius: 0 2px 2px 0;
  opacity:    0;
  transition: var(--transition);
}
.feature-side-card:hover .feature-side-left-bar { opacity: 1; }
.feature-side-icon {
  font-size:  1.8rem;
  color:      var(--secondary);
  flex-shrink: 0;
  width:      48px; height: 48px;
  display:    flex;
  align-items: center;
  justify-content: center;
  background: rgba(110,155,255,0.08);
  border-radius: var(--radius-sm);
}
.feature-side-title { font-weight: 700; font-size: 0.95rem; margin-bottom: 2px; }
.feature-side-desc  { font-size: 0.8rem; color: var(--on-surface-variant); }

/* ══════════════════════════════════════════════════════════════
   COMPLETE GRID (WolframAlpha-inspired)
   ══════════════════════════════════════════════════════════════ */
.complete-grid {
  display:               grid;
  grid-template-columns: repeat(2, 1fr);
  gap:                   10px;
  margin-bottom:         32px;
}
.grid-tool-item {
  background:    var(--surface-container-low);
  border-radius: var(--radius-md);
  padding:       18px 16px;
  display:       flex;
  flex-direction: column;
  align-items:   flex-start;
  gap:           10px;
  cursor:        pointer;
  transition:    var(--transition);
  border:        1px solid transparent;
  position:      relative;
  overflow:      hidden;
  text-decoration: none;
  color:         inherit;
}
.grid-tool-item::before {
  content:    '';
  position:   absolute;
  top:        0; left: 0; right: 0;
  height:     2px;
  background: var(--primary);
  transform:  scaleX(0);
  transition: transform 0.2s ease;
  transform-origin: left;
}
.grid-tool-item:hover { background: var(--surface-container-high); border-color: rgba(255,255,255,0.06); }
.grid-tool-item:hover::before { transform: scaleX(1); }
.grid-tool-icon {
  font-size: 1.4rem;
  color:     var(--primary);
}
.grid-tool-name {
  font-size:     0.82rem;
  font-weight:   700;
  color:         var(--on-surface);
}
.grid-tool-tagline {
    font-size: 0.7rem;
    color: var(--on-surface-variant);
    opacity: 0.8;
}


/* ══════════════════════════════════════════════════════════════
   TOOL CONTAINER (active calculator)
   ══════════════════════════════════════════════════════════════ */
.tool-container {
  display:        flex;
  flex-direction: column;
  gap:            20px;
  max-width:      720px;
  padding:        28px 0;
}

/* Tool Header */
.tool-header {
  display:    flex;
  align-items: flex-start;
  gap:         16px;
}
.tool-header-icon {
  width:         52px; height: 52px;
  background:    var(--primary-glow);
  border-radius: var(--radius-md);
  display:       flex;
  align-items:   center; justify-content: center;
  color:         var(--primary);
  font-size:     1.6rem;
  flex-shrink:   0;
}
.tool-header-info { flex: 1; }
.tool-header-info h1 {
  font-family:   var(--font-headline);
  font-size:     1.6rem;
  font-weight:   800;
  letter-spacing: -0.03em;
  margin-bottom: 4px;
}
.tool-header-info p { font-size: 0.875rem; color: var(--on-surface-variant); }

/* Input Card */
.input-card {
  background:    var(--surface-container);
  border:        1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding:       24px;
  display:       flex;
  flex-direction: column;
  gap:           16px;
  box-shadow:    var(--shadow-card);
}

/* Form Grid */
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-row.single { grid-template-columns: 1fr; }
.form-row.triple { grid-template-columns: 1fr 1fr 1fr; }

.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
  font-size:     0.72rem;
  font-weight:   700;
  color:         var(--on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.field input,
.field select {
  height:     48px;
  padding:    0 14px;
  background: rgba(255,255,255,0.04);
  border:     1px solid rgba(255,255,255,0.09);
  border-radius: var(--radius-sm);
  color:      var(--on-surface);
  font-size:  1rem;
  transition: var(--transition);
  outline:    none;
  width:      100%;
  -webkit-appearance: none;
  appearance: none;
}
.field input:focus,
.field select:focus {
  border-color: var(--primary-dim);
  background:   rgba(63,255,139,0.05);
  box-shadow:   0 0 0 3px var(--primary-glow);
}
.field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23767575' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}
.field select option { background: var(--surface-container); color: var(--on-surface); }

/* Toggle buttons */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--on-surface-variant);
}
.toggle-btn {
  display: flex;
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  overflow: hidden;
}
.toggle-btn button {
  padding: 6px 18px;
  background: transparent;
  color: var(--on-surface-variant);
  font-size: 0.82rem;
  font-weight: 700;
  transition: var(--transition);
}
.toggle-btn button.active {
  background: var(--primary);
  color:      var(--on-primary);
}

/* ══════════════════════════════════════════════════════════════
   ZONE C: NATIVE AD
   ══════════════════════════════════════════════════════════════ */
.ad-zone-c {
  padding: 24px 0; /* enforced 24px buffer from interactive elements */
}

/* ══════════════════════════════════════════════════════════════
   RESULT CARD
   ══════════════════════════════════════════════════════════════ */
.result-card {
  background:    var(--surface-container);
  border:        1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding:       24px;
  box-shadow:    var(--shadow-card);
  transition:    var(--transition-slow);
  position:      relative;
  overflow:      hidden;
}
.result-card::before {
  content:    '';
  position:   absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity:    0;
  transition: var(--transition);
}
.result-card.active::before { opacity: 1; }
.result-card.active {
  border-color: rgba(63,255,139,0.18);
  box-shadow:   var(--shadow-glow);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}
.result-item { display: flex; flex-direction: column; gap: 4px; }
.result-label {
  font-size:     0.68rem;
  font-weight:   700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color:         var(--on-surface-variant);
}
.result-value {
  font-family: var(--font-mono);
  font-size:   1.35rem;
  font-weight: 500;
  color:       var(--primary);
  display:     flex;
  align-items: center;
  gap:         8px;
  word-break:  break-all;
}
.result-value.large { font-size: 1.8rem; }
.result-sub { font-size: 0.78rem; color: var(--on-surface-variant); }

/* Copy button */
.copy-btn {
  background: none;
  border:     none;
  color:      var(--on-surface-variant);
  font-size:  0.85rem;
  padding:    2px 4px;
  border-radius: 4px;
  transition: var(--transition);
  opacity:    0;
  cursor:     pointer;
}
.result-item:hover .copy-btn { opacity: 1; }
.copy-btn:hover { color: var(--primary); background: var(--primary-glow); }
.copy-btn.copied { color: var(--success); opacity: 1; }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 700;
}
.badge-success { background: rgba(63,255,139,0.12); color: var(--success);  border: 1px solid rgba(63,255,139,0.3); }
.badge-warning { background: rgba(251,191,36,0.12);  color: var(--warning); border: 1px solid rgba(251,191,36,0.3); }
.badge-danger  { background: rgba(255,113,108,0.12); color: var(--danger);  border: 1px solid rgba(255,113,108,0.3); }

/* Result placeholder */
.result-placeholder {
  color: var(--on-surface-variant);
  font-size: 0.9rem;
  text-align: center;
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

/* ══════════════════════════════════════════════════════════════
   AMORTIZATION TABLE
   ══════════════════════════════════════════════════════════════ */
.table-card {
  background:    var(--surface-container);
  border:        1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding:       24px;
  box-shadow:    var(--shadow-card);
}
.table-header {
  display:    flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.table-title { font-size: 1rem; font-weight: 700; font-family: var(--font-headline); }
.print-btn {
  display:    inline-flex;
  align-items: center;
  gap:         6px;
  padding:    8px 16px;
  border:     1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-pill);
  background: transparent;
  color:      var(--on-surface-variant);
  font-size:  0.8rem;
  font-weight: 600;
  cursor:     pointer;
  transition: var(--transition);
}
.print-btn:hover { color: var(--primary); border-color: var(--primary-dim); background: var(--primary-glow); }
.table-scroll { overflow-x: auto; max-height: 320px; overflow-y: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.82rem; }
thead th {
  position: sticky; top: 0;
  background: var(--surface-container-high);
  padding: 10px 12px;
  text-align: left;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--on-surface-variant);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
tbody td {
  padding: 9px 12px;
  color: var(--on-surface-variant);
  border-bottom: 1px solid rgba(255,255,255,0.03);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--surface-container-high); color: var(--on-surface); }

/* ══════════════════════════════════════════════════════════════
   SEO CONTENT CARD
   ══════════════════════════════════════════════════════════════ */
.seo-card {
  background:    var(--surface-container-low);
  border:        1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-lg);
  padding:       28px;
}
.seo-card h2 {
  font-family:   var(--font-headline);
  font-size:     1rem;
  font-weight:   700;
  color:         var(--on-surface-variant);
  margin-bottom: 16px;
}
.seo-card h3 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--on-surface-variant);
  margin: 16px 0 6px;
}
.seo-card p {
  font-size:   0.875rem;
  color:       var(--outline);
  line-height: 1.75;
  margin-bottom: 10px;
}
.seo-card .formula-block {
  font-family: var(--font-mono);
  font-size:   0.82rem;
  background:  rgba(63,255,139,0.05);
  border:      1px solid rgba(63,255,139,0.15);
  border-radius: var(--radius-sm);
  padding:     12px 16px;
  color:       var(--primary-dim);
  margin:      10px 0;
  white-space: pre-wrap;
}
.seo-card details summary {
  cursor:    pointer;
  font-size: 0.85rem;
  color:     var(--outline);
  padding:   8px 0;
  list-style: none;
  display:   flex;
  align-items: center;
  gap:       6px;
}
.seo-card details summary::before { content: '▶'; font-size: 0.65rem; transition: var(--transition); }
.seo-card details[open] summary::before { content: '▼'; }
.seo-card details p { margin-top: 8px; padding-left: 16px; }

/* ══════════════════════════════════════════════════════════════
   SCIENTIFIC CALCULATOR
   ══════════════════════════════════════════════════════════════ */
.sci-display {
  background:    rgba(0,0,0,0.4);
  border:        1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-sm);
  padding:       14px 18px;
  font-family:   var(--font-mono);
  font-size:     1.6rem;
  color:         var(--primary);
  text-align:    right;
  min-height:    64px;
  word-break:    break-all;
  margin-bottom: 12px;
}
.sci-display .expr { font-size: 0.82rem; color: var(--on-surface-variant); margin-bottom: 4px; min-height: 18px; }
.sci-keypad { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.sci-btn {
  height:        52px;
  border:        1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-sm);
  background:    rgba(255,255,255,0.03);
  color:         var(--on-surface);
  font-size:     0.88rem;
  font-weight:   600;
  cursor:        pointer;
  transition:    var(--transition);
  display:       flex;
  align-items:   center;
  justify-content: center;
  user-select:   none;
}
.sci-btn:hover  { background: var(--surface-container-high); }
.sci-btn:active { transform: scale(0.93); }
.sci-btn.op     { color: var(--secondary); background: rgba(110,155,255,0.07); }
.sci-btn.eq     { background: var(--primary); color: var(--on-primary); font-size: 1.2rem; }
.sci-btn.eq:hover { background: var(--primary-dim); }
.sci-btn.fn     { color: var(--warning); font-size: 0.76rem; }
.sci-btn.del    { color: var(--danger); }
.sci-btn.zero   { grid-column: span 2; }

/* ══════════════════════════════════════════════════════════════
   UNIT CONVERTER
   ══════════════════════════════════════════════════════════════ */
.unit-converter-layout {
  display:               grid;
  grid-template-columns: 1fr auto 1fr;
  gap:                   12px;
  align-items:           end;
}
.swap-btn {
  height:        48px; width: 48px;
  border-radius: 50%;
  background:    rgba(110,155,255,0.1);
  border:        1px solid rgba(110,155,255,0.25);
  color:         var(--secondary);
  font-size:     1.2rem;
  cursor:        pointer;
  transition:    var(--transition);
  display:       flex;
  align-items:   center; justify-content: center;
  flex-shrink:   0;
}
.swap-btn:hover { background: var(--secondary-container); color: #fff; transform: rotate(180deg); }

/* ══════════════════════════════════════════════════════════════
   ANIMATIONS
   ══════════════════════════════════════════════════════════════ */
@keyframes glowPulse {
  0%   { box-shadow: var(--shadow-card); }
  40%  { box-shadow: 0 0 40px var(--primary-glow), 0 8px 40px rgba(0,0,0,0.5); }
  100% { box-shadow: var(--shadow-glow); }
}
.result-glow { animation: glowPulse 0.35s ease forwards; }

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeSlideUp 0.25s ease forwards; }

/* ══════════════════════════════════════════════════════════════
   BOTTOM NAV (Mobile)
   ══════════════════════════════════════════════════════════════ */
.bottom-nav {
  position:   fixed;
  bottom:     0; left: 0; right: 0;
  height:     var(--bottom-nav-h);
  display:    flex;
  justify-content: space-around;
  align-items: center;
  padding:    0 8px;
  background: rgba(14,14,14,0.92);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-top: 1px solid rgba(255,255,255,0.06);
  box-shadow: 0 -8px 30px rgba(0,0,0,0.5);
  z-index:    100;
}
.bottom-nav-item {
  display:        flex;
  flex-direction: column;
  align-items:    center;
  justify-content: center;
  gap:            2px;
  padding:        8px 12px;
  border-radius:  var(--radius-md);
  color:          var(--outline);
  transition:     var(--transition);
  min-width:      54px;
  position:       relative;
}
.bottom-nav-item::after {
  content:       '';
  position:      absolute;
  bottom:        -2px;
  width:         4px; height: 4px;
  border-radius: 50%;
  background:    var(--primary);
  opacity:       0;
  transition:    var(--transition);
}
.bottom-nav-item.active        { color: var(--primary); }
.bottom-nav-item.active::after { opacity: 1; }
.bottom-nav-icon  { font-size: 1.4rem; }
.bottom-nav-label { font-size: 0.6rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; }

/* ══════════════════════════════════════════════════════════════
   FOOTER
   ══════════════════════════════════════════════════════════════ */
.site-footer {
  border-top: 1px solid rgba(255,255,255,0.05);
  background: var(--surface-container-lowest);
  padding:    20px 24px 100px; /* extra bottom for mobile nav */
  display:    flex;
  flex-direction: column;
  align-items: center;
  gap:         16px;
}
.footer-content {
  display:    flex;
  flex-direction: column;
  align-items: center;
  gap:         12px;
  text-align: center;
}
.footer-brand { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.footer-copy  { font-size: 0.78rem; color: var(--outline); }
.footer-links {
  display:    flex;
  gap:        20px;
  font-size:  0.78rem;
  color:      var(--outline);
}
.footer-links a:hover { color: var(--primary); }

/* ══════════════════════════════════════════════════════════════
   RESPONSIVE: TABLET (768px+)
   ══════════════════════════════════════════════════════════════ */
@media (min-width: 768px) {
  body { padding-bottom: 0; }

  .topbar-search { display: block; }
  .mobile-menu-btn { display: none; }
  .mobile-search-btn { display: none; }
  .bottom-nav { display: none; }
  .site-footer { padding-bottom: 20px; }

  /* Sidebar always visible on md+ */
  .sidebar {
    position:  sticky;
    transform: none !important;
    top:       var(--topbar-h);
    height:    calc(100dvh - var(--topbar-h));
    flex-shrink: 0;
  }
  .sidebar-backdrop { display: none !important; }

  /* Hero search hidden — desktop uses topbar search */
  .hero-search { display: none; }

  /* Featured grid: 2-col */
  .featured-grid {
    grid-template-columns: 1.4fr 1fr;
    min-height: 380px;
  }
  .feature-side-grid {
    grid-template-columns: 1fr;/* ─── Tool Loader Overlay ───────────────────────────────────── */
#tool-loader-overlay {
  position: fixed;
  inset: 0;
  background: rgba(12, 17, 26, 0.8);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
}
.loader {
  width: 48px;
  height: 48px;
  border: 4px solid var(--primary-glow);
  border-bottom-color: transparent;
  border-radius: 50%;
  animation: rotation 1s linear infinite;
}
@keyframes rotation {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}
    gap: 12px;
  }

  /* Complete grid: 3-col */
  .complete-grid { grid-template-columns: repeat(3, 1fr); }

  .topbar-nav { display: flex; }

  .footer-content { flex-direction: row; justify-content: space-between; width: 100%; max-width: 900px; text-align: left; }
  .footer-brand { align-items: flex-start; }
}

/* ══════════════════════════════════════════════════════════════
   RESPONSIVE: DESKTOP (1024px+)
   ══════════════════════════════════════════════════════════════ */
@media (min-width: 1024px) {
  /* Complete grid: 4-col */
  .complete-grid { grid-template-columns: repeat(4, 1fr); }

  .main-content { padding: 0 32px 48px; }
}

/* ══════════════════════════════════════════════════════════════
   RESPONSIVE: WIDE (1440px+) — show ad rail
   ══════════════════════════════════════════════════════════════ */
@media (min-width: 1024px) {
  .ad-rail { display: block; }

  /* Complete grid: 5-col */
  .complete-grid { grid-template-columns: repeat(5, 1fr); }
}

/* ══════════════════════════════════════════════════════════════
   RESPONSIVE: Mobile form adjustments
   ══════════════════════════════════════════════════════════════ */
@media (max-width: 767px) {
  .form-row { grid-template-columns: 1fr; }
  .form-row.triple { grid-template-columns: 1fr 1fr; }
  .unit-converter-layout {
    grid-template-columns: 1fr;
  }
  .swap-btn { justify-self: center; transform: rotate(90deg); margin: 4px auto; display: flex; }
  .swap-btn:hover { transform: rotate(270deg); }
  .sci-keypad { grid-template-columns: repeat(4, 1fr); }
  .result-grid { grid-template-columns: 1fr 1fr; }
  .section-header { flex-direction: column; align-items: flex-start; gap: 4px; }
  .main-content { padding: 0 16px 32px; }
}

/* ══════════════════════════════════════════════════════════════
   PRINT STYLES
   ══════════════════════════════════════════════════════════════ */
@media print {
  body { background: white !important; color: black !important; padding: 0 !important; margin: 0 !important; }
  .sidebar, .top-bar, .bottom-nav, .ad-rail, .ad-slot, .footer, .tool-header-actions, .form-row, .share-btn, .action-btn, #tool-loader-overlay { 
    display: none !important; 
  }
  .app-shell { display: block !important; margin: 0 !important; padding: 0 !important; }
  .main-content { margin: 0 !important; padding: 0 !important; width: 100% !important; max-width: none !important; top: 0 !important; }
  .tool-container { box-shadow: none !important; border: 1px solid #eee !important; padding: 20px !important; margin: 0 !important; }
  .result-card { background: #f9f9f9 !important; border: 1px solid #ddd !important; color: black !important; }
  .result-value, .result-label { color: black !important; text-shadow: none !important; }
  .result-glow { border: none !important; background: none !important; }
  h1 { font-size: 24pt !important; margin-bottom: 20px !important; color: black !important; }
  .amort-table th { background: #eee !important; color: black !important; }
  .amort-table td { border-bottom: 1px solid #eee !important; }
  
  /* Add PrecisionCalc Branding to Print */
  #active-tool-view::before {
    content: "PrecisionCalc.com — Professional Tool Report";
    display: block;
    font-size: 10pt;
    font-weight: 700;
    color: #444;
    margin-bottom: 30px;
    border-bottom: 1px solid #333;
    padding-bottom: 8px;
  }
}

/* ══════════════════════════════════════════════════════════════
   HOME PAGE BENTO CALCULATOR
   ══════════════════════════════════════════════════════════════ */
.home-calc-card {
  background: var(--surface-container-highest);
  border: 1px solid var(--outline-variant);
  border-radius: 20px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
.home-calc-display {
  background: rgba(0,0,0,0.3);
  padding: 16px;
  border-radius: 12px;
  text-align: right;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  border: 1px solid rgba(255,255,255,0.05);
  font-family: 'JetBrains Mono', monospace;
}
.home-calc-prev { font-size: 0.9rem; color: var(--on-surface-variant); opacity: 0.7; height: 1.2em; min-height: 1.2em; }
.home-calc-current { font-size: 1.8rem; font-weight: 700; color: var(--primary); word-break: break-all; }

.home-calc-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.calc-btn {
  background: var(--surface-container);
  border: none;
  border-radius: 10px;
  padding: 12px 0;
  color: var(--on-surface);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.calc-btn:hover { background: var(--surface-container-high); transform: translateY(-2px); }
.calc-btn:active { transform: translateY(0); scale: 0.95; }
.calc-btn.opt { color: var(--secondary); background: rgba(0,255,136,0.05); }
.calc-btn.action { background: var(--primary); color: var(--on-primary); }

/* ─── Category Accordion (Mobile Only) ─── */
@media (max-width: 768px) {
  .all-calculators-grid {
    display: none;
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 12px 16px;
    background: var(--surface-container-low);
    border-radius: 0 0 16px 16px;
    margin-top: -8px;
    margin-bottom: 16px;
  }
  
  .category-header {
    cursor: pointer;
    margin-bottom: 8px;
    border-radius: 12px;
    transition: background 0.3s;
    position: relative;
    padding-right: 48px;
  }
  
  .category-header:hover {
    background: var(--surface-container-high);
  }
  
  .category-header::after {
    content: 'expand_more';
    font-family: 'Material Symbols Outlined';
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--on-surface-variant);
    transition: transform 0.3s;
  }
  
  .category-header.active {
    background: var(--surface-container-highest);
    border-radius: 16px 16px 0 0;
    margin-bottom: 8px;
  }
  
  .category-header.active::after {
    transform: translateY(-50%) rotate(180deg);
  }
  
  .category-header.active + .all-calculators-grid {
    display: grid;
  }

  .calculator-grid-item {
    background: var(--surface);
    border: 1px solid var(--outline-variant);
  }
}