/* ============================================
   CalcHeaven — Design System
   Premium, production-ready styles
   ============================================ */

/* ---------- Tokens ---------- */
:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-soft: #eff6ff;
  --color-accent: #22c55e;
  --color-accent-soft: #f0fdf4;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-danger: #ef4444;
  --color-warning: #f59e0b;

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

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.08);
  --shadow-focus: 0 0 0 3px rgba(37, 99, 235, 0.2);

  --font-sans: "Plus Jakarta Sans", "Segoe UI", sans-serif;
  --font-display: "Plus Jakarta Sans", "Segoe UI", sans-serif;

  --container: 1160px;
  --nav-height: 72px;
  --transition: 220ms cubic-bezier(0.22, 1, 0.36, 1);
  --transition-slow: 450ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
}

ul,
ol {
  list-style: none;
}

/* ---------- Utilities ---------- */
.container {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
}

.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;
}

/* ---------- Typography ---------- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
}

h3 {
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

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

.section-label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.section-header {
  max-width: 640px;
  margin-bottom: 3rem;
}

.section-header p {
  margin-top: 0.875rem;
  font-size: 1.0625rem;
  line-height: 1.65;
}

.section-header--center {
  text-align: center;
  margin-inline: auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9375rem;
  transition: background var(--transition), color var(--transition),
    transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--color-border-strong);
  background: var(--color-bg);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn-ghost:hover {
  color: var(--color-text);
  background: rgba(15, 23, 42, 0.04);
}

.btn-accent {
  background: var(--color-accent);
  color: #fff;
}

.btn-accent:hover {
  background: #16a34a;
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 0.625rem 1rem;
  font-size: 0.875rem;
}

/* ---------- Navigation ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition),
    box-shadow var(--transition);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  gap: 1.5rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.03em;
  color: var(--color-text);
  flex-shrink: 0;
}

.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--color-primary), #3b82f6);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 0.875rem;
  font-weight: 800;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--color-text);
  background: rgba(15, 23, 42, 0.04);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}

.nav-toggle:hover {
  background: rgba(15, 23, 42, 0.04);
}

.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 18px;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.site-header.is-open .nav-toggle-bars span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header.is-open .nav-toggle-bars span:nth-child(2) {
  opacity: 0;
}

.site-header.is-open .nav-toggle-bars span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav {
  display: none;
  position: absolute;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 1.25rem 1.5rem;
  box-shadow: var(--shadow-md);
}

.site-header.is-open .mobile-nav {
  display: block;
  animation: fadeSlideDown 200ms ease;
}

.mobile-nav a {
  display: block;
  padding: 0.875rem 0.75rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.mobile-nav a:hover {
  background: var(--color-bg);
  color: var(--color-text);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 5.5rem 0 4.5rem;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 85% 55% at 50% -15%, rgba(37, 99, 235, 0.14), transparent 58%),
    radial-gradient(ellipse 45% 40% at 85% 15%, rgba(34, 197, 94, 0.1), transparent 55%),
    radial-gradient(ellipse 40% 35% at 10% 40%, rgba(37, 99, 235, 0.05), transparent 50%),
    linear-gradient(180deg, #eef4ff 0%, var(--color-bg) 72%);
  pointer-events: none;
  z-index: 0;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(15, 23, 42, 0.045) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 78%);
  pointer-events: none;
  z-index: 0;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}

.hero-brand {
  font-size: clamp(2.85rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.02;
  background: linear-gradient(135deg, var(--color-text) 10%, #1e3a8a 85%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1.25rem;
}

.hero-headline {
  font-size: clamp(1.5rem, 3.2vw, 2.125rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.25;
  color: var(--color-text);
  max-width: 22ch;
  margin: 0 auto 1rem;
}

.hero-tagline {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  color: var(--color-text-secondary);
  margin: 0 auto 2.25rem;
  font-weight: 450;
  max-width: 36rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

/* ---------- Search ---------- */
.search-box {
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

.search-box-inner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 0.4rem 0.4rem 0.4rem 1.25rem;
  box-shadow: var(--shadow-lg);
  transition: border-color var(--transition), box-shadow var(--transition),
    transform var(--transition);
}

.search-box-inner:hover {
  border-color: var(--color-border-strong);
}

.search-box-inner:focus-within {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg), var(--shadow-focus);
}

.search-icon {
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.search-input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  padding: 0.875rem 0;
  font-size: 1rem;
  min-width: 0;
}

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

.search-submit {
  flex-shrink: 0;
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: background var(--transition);
}

.search-submit:hover {
  background: var(--color-primary-hover);
}

/* In-flow results: sit under the input and push hero buttons down */
.search-results {
  display: none;
  width: 100%;
  margin-top: 0.875rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  text-align: left;
}

.search-results.is-open {
  display: block;
  animation: fadeSlideDown 180ms ease;
}

.search-result {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  width: 100%;
  padding: 0.875rem 1rem;
  transition: background var(--transition);
  border-bottom: 1px solid var(--color-border);
}

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

.search-result:hover,
.search-result.is-active {
  background: var(--color-primary-soft);
}

.search-result-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  display: grid;
  place-items: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.search-result-body {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
  flex: 1;
}

.search-result-title {
  display: block;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.35;
}

.search-result-desc {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.search-empty {
  padding: 1.25rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* ---------- Sections ---------- */
.section {
  padding: 5.5rem 0;
}

.section--tight {
  padding: 3.5rem 0;
}

.section--alt {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

/* ---------- Cards / Calculator Grid ---------- */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.35rem;
}

.calc-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.65rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow),
    border-color var(--transition);
  overflow: hidden;
}

.calc-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition);
}

.calc-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(37, 99, 235, 0.25);
}

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

.calc-card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  margin-bottom: 1.25rem;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  transition: transform var(--transition-slow), background var(--transition);
}

.calc-card:hover .calc-card-icon {
  transform: scale(1.06);
}

.calc-card-icon--accent {
  background: var(--color-accent-soft);
  color: #16a34a;
}

.calc-card-icon--warm {
  background: #fff7ed;
  color: #ea580c;
}

.calc-card-icon--slate {
  background: #f1f5f9;
  color: #334155;
}

.calc-card-icon--rose {
  background: #fff1f2;
  color: #e11d48;
}

.calc-card-icon--teal {
  background: #f0fdfa;
  color: #0d9488;
}

.calc-card h3 {
  margin-bottom: 0.5rem;
}

.calc-card p {
  font-size: 0.9375rem;
  flex: 1;
  margin-bottom: 1.25rem;
}

.calc-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: gap var(--transition);
}

.calc-card:hover .calc-card-link {
  gap: 0.625rem;
}

.calc-card-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  background: var(--color-accent-soft);
  color: #15803d;
}

.featured-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 1.25rem;
}

.featured-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 280px;
  padding: 2rem;
  border-radius: var(--radius-xl);
  background: linear-gradient(145deg, #1e40af 0%, var(--color-primary) 50%, #3b82f6 100%);
  color: #fff;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.featured-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.featured-card::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 60%;
  height: 120%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15), transparent 70%);
  pointer-events: none;
}

.featured-card--accent {
  background: linear-gradient(145deg, #15803d 0%, var(--color-accent) 60%, #4ade80 100%);
  min-height: 0;
}

.featured-stack {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.featured-card h3 {
  color: #fff;
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  position: relative;
}

.featured-card p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9375rem;
  margin-bottom: 1.25rem;
  max-width: 320px;
  position: relative;
}

.featured-card .btn {
  position: relative;
  align-self: flex-start;
  background: #fff;
  color: var(--color-primary);
}

.featured-card--accent .btn {
  color: #15803d;
}

.featured-card .btn:hover {
  background: #f1f5f9;
}

.featured-label {
  position: relative;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 0.75rem;
}

/* ---------- Category Browse ---------- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.category-card {
  display: flex;
  align-items: center;
  gap: 1.125rem;
  padding: 1.5rem 1.35rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow),
    border-color var(--transition), background var(--transition);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(37, 99, 235, 0.28);
  background: var(--color-surface);
}

.category-card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  transition: transform var(--transition-slow);
}

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

.category-card-icon--accent {
  background: var(--color-accent-soft);
  color: #16a34a;
}

.category-card-icon--slate {
  background: #f1f5f9;
  color: #334155;
}

.category-card-icon--warm {
  background: #fff7ed;
  color: #ea580c;
}

.category-card-body {
  flex: 1;
  min-width: 0;
}

.category-card-body h3 {
  margin-bottom: 0.35rem;
  font-size: 1.125rem;
}

.category-card-body p {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.category-card-meta {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 650;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.category-card-arrow {
  color: var(--color-text-muted);
  font-size: 1.125rem;
  transition: transform var(--transition), color var(--transition);
}

.category-card:hover .category-card-arrow {
  transform: translateX(4px);
  color: var(--color-primary);
}

.category-panels {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.category-panel {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}

.category-panel h3 {
  font-size: 0.9375rem;
  margin-bottom: 0.875rem;
  letter-spacing: -0.015em;
}

.category-links {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.category-links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  padding: 0.35rem 0.5rem;
  margin: 0 -0.5rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.category-links a:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

/* ---------- Why / Feature Cards ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.feature-card {
  text-align: left;
  padding: 1.65rem 1.4rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow),
    border-color var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

.feature-card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1.125rem;
  border-radius: var(--radius-md);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  transition: transform var(--transition-slow);
}

.feature-card:hover .feature-card-icon {
  transform: scale(1.06);
}

.feature-card-icon--accent {
  background: var(--color-accent-soft);
  color: #16a34a;
}

.feature-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.125rem;
}

.feature-card p {
  font-size: 0.925rem;
  line-height: 1.55;
}

/* Legacy why-grid support for older pages */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.why-item {
  text-align: center;
  padding: 1.5rem 1rem;
}

.why-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.25rem;
  border-radius: var(--radius-md);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: grid;
  place-items: center;
}

.why-item h3 {
  margin-bottom: 0.625rem;
}

.why-item p {
  font-size: 0.9375rem;
  max-width: 280px;
  margin-inline: auto;
}

/* ---------- Footer ---------- */
.site-footer {
  background: linear-gradient(180deg, #0b1220 0%, #0f172a 100%);
  color: #cbd5e1;
  padding: 4.5rem 0 2rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.35fr 1.65fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand .logo {
  color: #fff;
  margin-bottom: 1rem;
}

.footer-brand p {
  color: #94a3b8;
  font-size: 0.95rem;
  max-width: 320px;
  line-height: 1.65;
}

.footer-nav-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.footer-col a {
  display: block;
  font-size: 0.9rem;
  color: #94a3b8;
  padding: 0.35rem 0;
  transition: color var(--transition), transform var(--transition);
}

.footer-col a:hover {
  color: #fff;
  transform: translateX(2px);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.75rem;
  border-top: 1px solid rgba(148, 163, 184, 0.14);
  font-size: 0.8125rem;
  color: #64748b;
}

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
}

.footer-bottom a {
  color: #94a3b8;
  transition: color var(--transition);
}

.footer-bottom a:hover {
  color: #fff;
}

/* ---------- Page Hero (inner pages) ---------- */
.page-hero {
  padding: 3rem 0 2rem;
  background:
    radial-gradient(ellipse 70% 80% at 0% 0%, rgba(37, 99, 235, 0.08), transparent 50%),
    linear-gradient(180deg, #eef4ff 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

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

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

.breadcrumb-sep {
  color: var(--color-border-strong);
}

.page-hero h1 {
  margin-bottom: 0.75rem;
}

.page-hero-desc {
  font-size: 1.0625rem;
  max-width: 560px;
}

/* ---------- Calculator Layout ---------- */
.calc-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.5rem;
  padding: 2.5rem 0 4rem;
  align-items: start;
}

.calc-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
}

.calc-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.calc-panel-header h2 {
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.results-panel {
  background: linear-gradient(160deg, #1e40af 0%, var(--color-primary) 100%);
  border: none;
  color: #fff;
  position: sticky;
  top: calc(var(--nav-height) + 1.25rem);
}

.results-panel .calc-panel-header {
  border-bottom-color: rgba(255, 255, 255, 0.15);
}

.results-panel .calc-panel-header h2 {
  color: #fff;
}

.results-panel .calc-panel-header p,
.results-live-label {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.8125rem;
}

.result-main {
  margin-bottom: 1.5rem;
}

.result-main-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 0.375rem;
}

.result-main-value {
  font-size: clamp(2.25rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: #fff;
  font-variant-numeric: tabular-nums;
  transition: transform 150ms ease;
}

.result-main-value.is-updating {
  transform: scale(1.02);
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.result-item {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.result-item-label {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 0.25rem;
}

.result-item-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

/* ---------- Form Controls ---------- */
.form-group {
  margin-bottom: 1.5rem;
}

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

.form-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.625rem;
}

.form-label-hint {
  font-weight: 500;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}

.form-label-value {
  font-weight: 700;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

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

.input-prefix,
.input-suffix {
  position: absolute;
  color: var(--color-text-muted);
  font-weight: 500;
  pointer-events: none;
  z-index: 1;
}

.input-prefix {
  left: 1rem;
}

.input-suffix {
  right: 1rem;
}

.form-input {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
  transition: border-color var(--transition), box-shadow var(--transition),
    background var(--transition);
}

.form-input:hover {
  border-color: var(--color-border-strong);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: var(--shadow-focus);
}

.form-input.has-prefix {
  padding-left: 2.25rem;
}

.form-input.has-suffix {
  padding-right: 2.5rem;
}

.form-input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Range slider */
.range-wrap {
  padding: 0.25rem 0;
}

.form-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: var(--color-border);
  outline: none;
  cursor: pointer;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.4);
  cursor: pointer;
  transition: transform var(--transition);
}

.form-range::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.form-range::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.4);
  cursor: pointer;
}

.tip-presets {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.875rem;
}

.tip-preset {
  flex: 1;
  min-width: 56px;
  padding: 0.625rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.tip-preset:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.tip-preset.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.people-stepper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.stepper-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  transition: all var(--transition);
  flex-shrink: 0;
}

.stepper-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

.people-stepper .form-input {
  text-align: center;
  font-weight: 600;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

/* ---------- Content Sections ---------- */
.content-section {
  padding: 3.5rem 0;
}

.content-section + .content-section {
  border-top: 1px solid var(--color-border);
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.content-block h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.content-block p {
  margin-bottom: 1rem;
  font-size: 0.9875rem;
}

.content-block p:last-child {
  margin-bottom: 0;
}

.facts-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.fact-item {
  display: flex;
  gap: 1rem;
  padding: 1.125rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.fact-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  color: #16a34a;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.fact-item h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  letter-spacing: -0.01em;
}

.fact-item p {
  font-size: 0.875rem;
  margin: 0;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.related-card {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 1.125rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

.related-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

.related-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.related-card h4 {
  font-size: 0.9375rem;
  margin-bottom: 0.125rem;
}

.related-card span {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ---------- Coming Soon / Placeholder ---------- */
.coming-soon-banner {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  padding: 1rem 1.125rem;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
}

.coming-soon-banner p {
  font-size: 0.875rem;
  color: #92400e;
  margin: 0;
}

.coming-soon-banner strong {
  display: block;
  color: #78350f;
  margin-bottom: 0.125rem;
}

.placeholder-overlay {
  position: relative;
}

.placeholder-overlay::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(248, 250, 252, 0.35);
  border-radius: var(--radius-xl);
  pointer-events: none;
}

/* ---------- Static Pages ---------- */
.prose {
  max-width: 680px;
  margin: 0 auto;
  padding: 3rem 0 5rem;
}

.prose h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
}

.prose h3 {
  margin: 2rem 0 0.75rem;
}

.prose p,
.prose li {
  margin-bottom: 1rem;
  font-size: 1.025rem;
  color: var(--color-text-secondary);
}

.prose ul {
  list-style: disc;
  padding-left: 1.25rem;
  margin-bottom: 1.5rem;
}

.prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.contact-form {
  max-width: 520px;
  margin: 0 auto;
  padding: 3rem 0 5rem;
}

.contact-form .form-group {
  margin-bottom: 1.25rem;
}

.contact-form textarea.form-input {
  min-height: 140px;
  resize: vertical;
}

/* ---------- Animations ---------- */
@keyframes fadeSlideDown {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 {
  transition-delay: 80ms;
}

.reveal-delay-2 {
  transition-delay: 160ms;
}

.reveal-delay-3 {
  transition-delay: 240ms;
}

.hero-content > * {
  animation: fadeUp 0.75s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero-content > *:nth-child(1) {
  animation-delay: 0ms;
}

.hero-content > *:nth-child(2) {
  animation-delay: 90ms;
}

.hero-content > *:nth-child(3) {
  animation-delay: 170ms;
}

.hero-content > *:nth-child(4) {
  animation-delay: 250ms;
}

.hero-content > *:nth-child(5) {
  animation-delay: 330ms;
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .calc-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .featured-grid {
    grid-template-columns: 1fr;
  }

  .featured-stack {
    flex-direction: row;
  }

  .featured-stack .featured-card {
    flex: 1;
    min-height: 220px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .category-panels {
    grid-template-columns: repeat(2, 1fr);
  }

  .why-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .calc-layout {
    grid-template-columns: 1fr;
  }

  .results-panel {
    position: static;
  }

  .content-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .related-grid {
    grid-template-columns: 1fr 1fr;
  }

  .nav-links,
  .nav-cta .btn {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 1.5rem, var(--container));
  }

  .hero {
    padding: 3.25rem 0 2.75rem;
  }

  .hero-headline {
    max-width: none;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .section {
    padding: 3.75rem 0;
  }

  .section-header {
    margin-bottom: 2rem;
  }

  .calc-grid {
    grid-template-columns: 1fr;
  }

  .category-grid {
    grid-template-columns: 1fr;
  }

  .category-panels {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .featured-stack {
    flex-direction: column;
  }

  .search-box-inner {
    flex-wrap: wrap;
    padding: 0.75rem;
  }

  .search-input {
    width: 100%;
    padding: 0.5rem 0.5rem;
  }

  .search-submit {
    width: 100%;
  }

  .search-icon {
    display: none;
  }

  .footer-nav-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 0.875rem;
    text-align: center;
  }

  .footer-legal-links {
    justify-content: center;
  }

  .related-grid {
    grid-template-columns: 1fr;
  }

  .result-grid {
    grid-template-columns: 1fr;
  }

  .form-actions {
    flex-direction: column;
  }

  .tip-presets {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
  }

  .page-hero {
    padding: 2rem 0 1.5rem;
  }

  .calc-panel {
    padding: 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}