/* ============================================
   quickycalculator.info — Design System
   Premium calculator hub with 40+ tools
   ============================================ */

/* === Custom Properties === */
:root {
  /* Dark theme (default) */
  --bg-primary: #0a0b14;
  --bg-secondary: #12131f;
  --bg-surface: rgba(255,255,255,0.04);
  --bg-surface-hover: rgba(255,255,255,0.08);
  --bg-card: rgba(255,255,255,0.05);
  --bg-card-hover: rgba(255,255,255,0.10);
  --bg-input: rgba(255,255,255,0.06);
  --bg-input-focus: rgba(255,255,255,0.10);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --accent-primary: #6366f1;
  --accent-primary-rgb: 99,102,241;
  --accent-secondary: #8b5cf6;
  --accent-glow: rgba(99,102,241,0.3);
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a855f7);

  --color-health: #10b981;
  --color-health-bg: rgba(16,185,129,0.12);
  --color-finance: #f59e0b;
  --color-finance-bg: rgba(245,158,11,0.12);
  --color-math: #6366f1;
  --color-math-bg: rgba(99,102,241,0.12);
  --color-datetime: #ec4899;
  --color-datetime-bg: rgba(236,72,153,0.12);
  --color-utility: #06b6d4;
  --color-utility-bg: rgba(6,182,212,0.12);

  --border: rgba(255,255,255,0.08);
  --border-focus: rgba(99,102,241,0.5);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 30px rgba(99,102,241,0.15);

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

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --transition-fast: 150ms ease;
  --transition: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);

  --header-height: 64px;
  --max-width: 1280px;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-surface: rgba(0,0,0,0.03);
  --bg-surface-hover: rgba(0,0,0,0.06);
  --bg-card: rgba(255,255,255,0.8);
  --bg-card-hover: rgba(255,255,255,0.95);
  --bg-input: rgba(0,0,0,0.04);
  --bg-input-focus: rgba(0,0,0,0.06);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #f8fafc;

  --accent-glow: rgba(99,102,241,0.15);
  --border: rgba(0,0,0,0.08);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.1);
  --shadow-glow: 0 0 30px rgba(99,102,241,0.08);

  --color-health-bg: rgba(16,185,129,0.08);
  --color-finance-bg: rgba(245,158,11,0.08);
  --color-math-bg: rgba(99,102,241,0.08);
  --color-datetime-bg: rgba(236,72,153,0.08);
  --color-utility-bg: rgba(6,182,212,0.08);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
input, select, textarea { font: inherit; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* === Animated Background === */
.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-mesh .orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: float 20s ease-in-out infinite;
}

.bg-mesh .orb-1 {
  width: 500px; height: 500px;
  background: var(--accent-primary);
  top: -150px; left: -100px;
  animation-delay: 0s;
}

.bg-mesh .orb-2 {
  width: 400px; height: 400px;
  background: var(--accent-secondary);
  bottom: -100px; right: -100px;
  animation-delay: -7s;
  animation-duration: 25s;
}

.bg-mesh .orb-3 {
  width: 300px; height: 300px;
  background: #06b6d4;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -14s;
  animation-duration: 30s;
}

[data-theme="light"] .bg-mesh .orb { opacity: 0.12; }

/* === Header === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: var(--bg-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 4px;
}

.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--accent-gradient);
  color: white;
  font-size: 1.1rem;
  font-weight: 800;
  margin-right: 8px;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  font-size: 1.2rem;
  transition: all var(--transition);
}

.theme-toggle:hover {
  background: var(--bg-surface-hover);
  transform: rotate(30deg);
}

/* === Container === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* === Hero === */
.hero {
  text-align: center;
  padding: 80px 0 48px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--accent-glow);
  border: 1px solid rgba(var(--accent-primary-rgb), 0.2);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-primary);
  margin-bottom: 20px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}

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

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

/* === Search === */
.search-container {
  max-width: 560px;
  margin: 0 auto 48px;
  position: relative;
}

.search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: var(--text-muted);
  pointer-events: none;
  z-index: 2;
}

.search-input {
  width: 100%;
  padding: 16px 20px 16px 52px;
  border-radius: var(--radius-xl);
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  font-size: 1rem;
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition);
}

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

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

.search-clear {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 2;
}

.search-input:not(:placeholder-shown) ~ .search-clear { opacity: 1; }

/* === Category Tabs === */
.category-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}

.tab-btn {
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  transition: all var(--transition);
  white-space: nowrap;
}

.tab-btn:hover {
  background: var(--bg-surface-hover);
  border-color: var(--text-muted);
}

.tab-btn.active {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.tab-btn .tab-icon { margin-right: 6px; }

.tab-count {
  margin-left: 6px;
  padding: 1px 7px;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.15);
  font-size: 0.75rem;
}

.tab-btn.active .tab-count { background: rgba(255,255,255,0.25); }

/* === Calculator Grid === */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  padding-bottom: 80px;
}

.calc-card {
  position: relative;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  transition: all var(--transition-slow);
  cursor: pointer;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: fadeInUp 0.4s ease both;
}

.calc-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--card-accent-bg, var(--bg-surface));
  opacity: 0;
  transition: opacity var(--transition);
}

.calc-card:hover {
  transform: translateY(-4px);
  border-color: var(--card-accent, var(--accent-primary));
  box-shadow: 0 8px 30px rgba(0,0,0,0.2), 0 0 20px var(--card-accent-glow, var(--accent-glow));
}

.calc-card:hover::before { opacity: 1; }

.calc-card[data-category="health"] {
  --card-accent: var(--color-health);
  --card-accent-bg: var(--color-health-bg);
  --card-accent-glow: rgba(16,185,129,0.2);
}
.calc-card[data-category="finance"] {
  --card-accent: var(--color-finance);
  --card-accent-bg: var(--color-finance-bg);
  --card-accent-glow: rgba(245,158,11,0.2);
}
.calc-card[data-category="math"] {
  --card-accent: var(--color-math);
  --card-accent-bg: var(--color-math-bg);
  --card-accent-glow: rgba(99,102,241,0.2);
}
.calc-card[data-category="datetime"] {
  --card-accent: var(--color-datetime);
  --card-accent-bg: var(--color-datetime-bg);
  --card-accent-glow: rgba(236,72,153,0.2);
}
.calc-card[data-category="utility"] {
  --card-accent: var(--color-utility);
  --card-accent-bg: var(--color-utility-bg);
  --card-accent-glow: rgba(6,182,212,0.2);
}

.card-icon {
  position: relative;
  z-index: 1;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--card-accent-bg, var(--bg-surface));
}

.card-content { position: relative; z-index: 1; }

.card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.card-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.card-category {
  position: relative;
  z-index: 1;
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--card-accent, var(--text-muted));
}

.card-arrow {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  font-size: 0.8rem;
  opacity: 0;
  transform: translateX(-8px);
  transition: all var(--transition);
  z-index: 1;
}

.calc-card:hover .card-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* === No Results === */
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
}

.no-results-icon { font-size: 3rem; margin-bottom: 16px; }
.no-results h3 { font-size: 1.2rem; margin-bottom: 8px; color: var(--text-secondary); }

/* =============================================
   CALCULATOR PAGE STYLES
   ============================================= */

.calc-page {
  min-height: calc(100vh - var(--header-height));
  padding: 32px 0 80px;
}

.calc-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition);
  margin-bottom: 24px;
}

.calc-back:hover {
  background: var(--bg-surface-hover);
  transform: translateX(-4px);
}

.calc-header {
  margin-bottom: 32px;
}

.calc-header-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.calc-header h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.calc-header p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 640px;
}

.calc-formula-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Calculator Layout */
.calc-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

/* Input Panel */
.calc-inputs-panel {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.calc-inputs-panel h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.input-group {
  margin-bottom: 20px;
}

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

.input-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
  font-size: 0.875rem;
  font-weight: 500;
}

.input-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
}

.input-field {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-input);
  border: 1px solid var(--border);
  outline: none;
  font-size: 1rem;
  transition: all var(--transition);
}

.input-field:focus {
  border-color: var(--border-focus);
  background: var(--bg-input-focus);
  box-shadow: 0 0 0 3px rgba(var(--accent-primary-rgb), 0.1);
}

.input-field::placeholder { color: var(--text-muted); }

/* Range slider */
.input-range-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.input-range {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-input);
  outline: none;
}

.input-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(var(--accent-primary-rgb), 0.4);
  transition: transform var(--transition-fast);
}

.input-range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.input-range::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
  border: none;
}

.range-value {
  min-width: 60px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  border: 1px solid var(--border);
  text-align: center;
  font-size: 0.875rem;
  font-family: var(--font-mono);
  outline: none;
}

.range-value:focus {
  border-color: var(--border-focus);
}

/* Select */
.input-select {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-input);
  border: 1px solid var(--border);
  outline: none;
  font-size: 1rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='%2394a3b8'%3E%3Cpath d='M6 8.825L0.375 3.175l0.85-0.85L6 7.175l4.775-4.85 0.85 0.85z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.input-select:focus {
  border-color: var(--border-focus);
  background-color: var(--bg-input-focus);
}

/* Radio group */
.radio-group {
  display: flex;
  gap: 8px;
}

.radio-option {
  flex: 1;
  position: relative;
}

.radio-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.radio-option label {
  display: block;
  text-align: center;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-input);
  border: 1px solid var(--border);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.radio-option label:hover {
  background: var(--bg-input-focus);
}

.radio-option input:checked + label {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

/* Date input */
input[type="date"].input-field {
  color-scheme: dark;
}

[data-theme="light"] input[type="date"].input-field {
  color-scheme: light;
}

/* Results Panel */
.calc-results-panel {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.calc-results-panel h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-item {
  padding: 16px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  margin-bottom: 12px;
  transition: all var(--transition);
}

.result-item:last-child { margin-bottom: 0; }

.result-item.highlight {
  background: linear-gradient(135deg, rgba(var(--accent-primary-rgb), 0.15), rgba(139,92,246,0.1));
  border: 1px solid rgba(var(--accent-primary-rgb), 0.2);
}

.result-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.result-value {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

.result-item.highlight .result-value {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 2rem;
}

.result-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Result burst animation */
.result-item.burst {
  animation: resultBurst 0.5s ease;
}

/* Action Bar */
.action-bar {
  display: flex;
  gap: 8px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.btn-action {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--transition);
}

.btn-action:hover {
  background: var(--bg-surface-hover);
  transform: translateY(-1px);
}

.btn-action.copied {
  background: rgba(16,185,129,0.15);
  border-color: #10b981;
  color: #10b981;
}

/* === Info Section === */
.calc-info {
  margin-top: 32px;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.calc-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.calc-info p, .calc-info li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.calc-info ul {
  padding-left: 20px;
  list-style: disc;
}

.calc-info li { margin-bottom: 6px; }

/* === Footer === */
.site-footer {
  padding: 32px 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
}

.site-footer a {
  color: var(--accent-primary);
  transition: opacity var(--transition);
}

.site-footer a:hover { opacity: 0.8; }

/* === Animations === */
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(30px, -40px) scale(1.05); }
  50% { transform: translate(-20px, 20px) scale(0.95); }
  75% { transform: translate(40px, 10px) scale(1.02); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes resultBurst {
  0% { transform: scale(1); }
  30% { transform: scale(1.05); }
  60% { transform: scale(0.98); }
  100% { transform: scale(1); }
}

@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.fade-in { animation: fadeInUp 0.4s ease both; }
.fade-in-delay-1 { animation-delay: 0.05s; }
.fade-in-delay-2 { animation-delay: 0.10s; }
.fade-in-delay-3 { animation-delay: 0.15s; }

/* === Toast === */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  background: var(--text-primary);
  color: var(--bg-primary);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

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

/* === Responsive === */
@media (max-width: 900px) {
  .calc-body {
    grid-template-columns: 1fr;
  }
  .calc-results-panel {
    position: static;
  }
}

@media (max-width: 768px) {
  .hero { padding: 48px 0 32px; }
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 0.95rem; }

  .calc-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px;
  }

  .calc-card { padding: 20px; }
  .card-icon { width: 40px; height: 40px; font-size: 1.2rem; }

  .site-header { padding: 0 16px; }
  .container { padding: 0 16px; }

  .category-tabs { gap: 6px; }
  .tab-btn { padding: 7px 14px; font-size: 0.8rem; }
}

@media (max-width: 480px) {
  .calc-grid {
    grid-template-columns: 1fr;
  }

  .radio-group {
    flex-direction: column;
  }

  .action-bar {
    flex-wrap: wrap;
  }

  .btn-action { font-size: 0.75rem; }

  .result-value { font-size: 1.2rem; }
  .result-item.highlight .result-value { font-size: 1.5rem; }
}

/* === Print === */
@media print {
  .site-header, .site-footer, .bg-mesh,
  .action-bar, .calc-back, .theme-toggle { display: none !important; }

  body { background: white; color: black; }

  .calc-inputs-panel, .calc-results-panel, .calc-info {
    background: white;
    border: 1px solid #ddd;
    backdrop-filter: none;
  }

  .calc-body { display: block; }
  .calc-results-panel { margin-top: 24px; }
}

/* === Scrollbar === */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--bg-surface-hover);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* === Selection === */
::selection {
  background: rgba(var(--accent-primary-rgb), 0.3);
  color: white;
}

/* === Footer Enhancement === */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 48px 0;
  margin-top: auto;
  backdrop-filter: blur(20px);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.footer-info p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-links-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links-row a {
  transition: color var(--transition);
}

.footer-links-row a:hover {
  color: var(--accent-primary);
}

.footer-separator {
  color: var(--border);
  opacity: 0.5;
}

/* === Info Pages (About, FAQ, Privacy, etc.) === */
.info-page {
  padding: 60px 24px 100px;
  max-width: 800px;
  margin: 0 auto;
}

.info-content h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  margin-bottom: 32px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.info-content h2 {
  font-size: 1.5rem;
  margin: 40px 0 20px;
  color: var(--text-primary);
}

.info-content h3 {
  font-size: 1.1rem;
  margin: 24px 0 12px;
  color: var(--accent-primary);
}

.info-content p {
  margin-bottom: 20px;
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

.info-content ul {
  list-style: disc;
  padding-left: 20px;
  margin-bottom: 30px;
  color: var(--text-secondary);
}

.info-content li {
  margin-bottom: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 16px;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: var(--accent-primary);
  background: var(--bg-card-hover);
}

.faq-item h3 {
  margin-top: 0;
  color: var(--text-primary);
  font-weight: 600;
}

.faq-item p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

@media (max-width: 768px) {
  .footer-content { gap: 16px; }
  .footer-links-row { gap: 12px; font-size: 0.8rem; }
  .footer-separator { display: none; }
  .info-page { padding-top: 40px; }
}