/* ============================================
   BRACALC.COM — Design System & Styles
   Aesthetic: Refined Utility / Warm Precision
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Color Palette */
  --color-bg: #FAF7F2;
  --color-bg-alt: #F3EDE4;
  --color-bg-card: #FFFFFF;
  --color-bg-dark: #1A1612;
  --color-text: #2C2520;
  --color-text-muted: #7A7067;
  --color-text-light: #A69E94;
  --color-accent: #C4553A;
  --color-accent-hover: #A8432B;
  --color-accent-light: #F9E8E3;
  --color-accent-glow: rgba(196, 85, 58, 0.15);
  --color-success: #3A8C5C;
  --color-success-light: #E6F4EC;
  --color-border: #E5DDD3;
  --color-border-light: #F0EBE3;
  --color-highlight: #F5D76E;

  /* Typography */
  --font-heading: 'DM Serif Display', Georgia, serif;
  --font-body: 'Outfit', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Sizing */
  --max-width: 1140px;
  --max-width-narrow: 740px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 100px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(44, 37, 32, 0.06);
  --shadow-md: 0 4px 16px rgba(44, 37, 32, 0.08);
  --shadow-lg: 0 8px 32px rgba(44, 37, 32, 0.10);
  --shadow-xl: 0 16px 48px rgba(44, 37, 32, 0.12);
  --shadow-accent: 0 4px 20px rgba(196, 85, 58, 0.25);

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
}

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

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.65;
  overflow-x: hidden;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

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

::selection {
  background: var(--color-accent-light);
  color: var(--color-accent-hover);
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 400;
  line-height: 1.2;
  color: var(--color-text);
}

h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.1rem; }

p {
  max-width: 65ch;
}

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

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

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

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 0.3em 0.8em;
  border-radius: var(--radius-pill);
  font-weight: 500;
}

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

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

section {
  padding: var(--space-3xl) 0;
}

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 247, 242, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-light);
  transition: box-shadow var(--duration-normal) var(--ease-out);
}

.nav.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav__logo-icon {
  width: 28px;
  height: 28px;
  background: var(--color-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 700;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}

.nav__links a {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
  position: relative;
  padding-bottom: 2px;
}

.nav__links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
  transition: width var(--duration-normal) var(--ease-out);
}

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

.nav__links a:hover::after {
  width: 100%;
}

.nav__mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
  position: relative;
}

.nav__mobile-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  position: absolute;
  left: 6px;
  transition: all var(--duration-normal) var(--ease-out);
}

.nav__mobile-toggle span:nth-child(1) { top: 10px; }
.nav__mobile-toggle span:nth-child(2) { top: 15px; }
.nav__mobile-toggle span:nth-child(3) { top: 20px; }

.nav__mobile-toggle.active span:nth-child(1) {
  top: 15px;
  transform: rotate(45deg);
}
.nav__mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav__mobile-toggle.active span:nth-child(3) {
  top: 15px;
  transform: rotate(-45deg);
}

/* --- Hero Section --- */
.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  text-align: center;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
}

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

.hero h1 span {
  color: var(--color-accent);
  position: relative;
}

.hero h1 span::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 4px;
  width: 100%;
  height: 8px;
  background: var(--color-accent-light);
  z-index: -1;
  border-radius: 4px;
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--color-text-muted);
  max-width: 540px;
  margin: 0 auto var(--space-lg);
  line-height: 1.7;
}

.hero__trust {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
  margin-top: var(--space-lg);
}

.hero__trust-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.hero__trust-icon {
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-success);
}

/* --- Calculator Section --- */
.calculator {
  padding: var(--space-2xl) 0 var(--space-3xl);
}

.calc-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
}

.calc-card__header {
  background: var(--color-bg-dark);
  color: white;
  padding: var(--space-lg) var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.calc-card__header h2 {
  color: white;
  font-size: 1.3rem;
}

.unit-toggle {
  display: flex;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-pill);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.unit-toggle__btn {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.6);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.45em 1.2em;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.unit-toggle__btn.active {
  background: var(--color-accent);
  color: white;
  border-radius: var(--radius-pill);
}

.calc-card__body {
  padding: var(--space-xl);
}

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

.input-group {
  position: relative;
}

.input-group label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.input-group__hint {
  font-size: 0.78rem;
  color: var(--color-text-light);
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  display: block;
  margin-bottom: var(--space-sm);
}

.input-group input[type="number"] {
  width: 100%;
  padding: 0.9rem 1.2rem;
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--duration-fast) var(--ease-out);
  -moz-appearance: textfield;
}

.input-group input[type="number"]::-webkit-inner-spin-button,
.input-group input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.input-group input[type="number"]:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-glow);
}

.input-group__unit {
  position: absolute;
  right: 14px;
  bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-text-light);
  font-weight: 500;
  pointer-events: none;
}

.calc-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  padding: 1rem 2rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: white;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.calc-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.15) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.6s var(--ease-out);
}

.calc-btn:hover {
  background: var(--color-accent-hover);
  box-shadow: var(--shadow-accent);
  transform: translateY(-1px);
}

.calc-btn:hover::before {
  transform: translateX(100%);
}

.calc-btn:active {
  transform: translateY(0);
}

.calc-btn svg {
  width: 18px;
  height: 18px;
}

/* --- Results Section --- */
.results {
  display: none;
  margin-top: var(--space-xl);
  animation: fadeSlideUp 0.5s var(--ease-out) forwards;
}

.results.visible {
  display: block;
}

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

.results__primary {
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, #2A2320 100%);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  color: white;
  text-align: center;
  margin-bottom: var(--space-lg);
  position: relative;
  overflow: hidden;
}

.results__primary::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 140px;
  height: 140px;
  background: var(--color-accent);
  border-radius: 50%;
  opacity: 0.12;
}

.results__primary-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: var(--space-sm);
}

.results__primary-size {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  color: white;
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.results__primary-desc {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  max-width: 400px;
  margin: 0 auto;
}

.results__international {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.size-badge {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
  transition: all var(--duration-fast) var(--ease-out);
}

.size-badge:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.size-badge__region {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-light);
  margin-bottom: 4px;
}

.size-badge__size {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--color-text);
}

/* Sister Sizes */
.sister-sizes {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  border: 1px solid var(--color-border-light);
}

.sister-sizes__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin-bottom: var(--space-xs);
}

.sister-sizes__subtitle {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.sister-sizes__grid {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.sister-size-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  min-width: 72px;
  transition: all var(--duration-fast) var(--ease-out);
}

.sister-size-chip.current {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
  box-shadow: var(--shadow-accent);
}

.sister-size-chip__label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.5;
}

.sister-size-chip.current .sister-size-chip__label {
  color: rgba(255,255,255,0.7);
}

.sister-size-chip__size {
  font-family: var(--font-heading);
  font-size: 1.1rem;
}

.sister-arrow {
  color: var(--color-text-light);
  font-size: 0.8rem;
}

/* --- Content Pillar Sections --- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

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

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  max-width: 520px;
  margin: 0 auto;
}

/* Sister Size Matrix */
.matrix-section {
  background: var(--color-bg-alt);
}

.matrix-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  -webkit-overflow-scrolling: touch;
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-bg-card);
  font-size: 0.88rem;
  min-width: 600px;
}

.matrix-table thead {
  background: var(--color-bg-dark);
  color: white;
}

.matrix-table th {
  padding: 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
  white-space: nowrap;
}

.matrix-table td {
  padding: 0.7rem 1rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border-light);
  font-weight: 500;
  white-space: nowrap;
}

.matrix-table tbody tr:hover {
  background: var(--color-accent-light);
}

.matrix-table tbody tr:hover td {
  color: var(--color-accent-hover);
}

.matrix-table .highlight-cell {
  background: var(--color-accent);
  color: white;
  font-weight: 700;
  border-radius: 4px;
}

/* International Converter */
.converter-section {
  background: var(--color-bg);
}

.converter-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
}

.converter-select-group {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-lg);
  align-items: end;
  margin-bottom: var(--space-xl);
}

.converter-select-group label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.converter-select-group select {
  width: 100%;
  padding: 0.8rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237A7067' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
}

.converter-select-group select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-glow);
}

.converter-arrow {
  font-size: 1.3rem;
  color: var(--color-text-light);
  padding-bottom: 8px;
}

.converter-result {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  border: 1px dashed var(--color-border);
}

.converter-result__size {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  color: var(--color-accent);
}

.converter-result__label {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

/* Fit Test */
.fit-test-section {
  background: var(--color-bg-alt);
}

.fit-checklist {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.fit-item {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  border: 2px solid var(--color-border-light);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  position: relative;
}

.fit-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.fit-item.checked {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

.fit-item__check {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-fast) var(--ease-out);
}

.fit-item.checked .fit-item__check {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.fit-item.checked .fit-item__check::after {
  content: '✓';
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
}

.fit-item__icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.fit-item__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin-bottom: var(--space-xs);
}

.fit-item__desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.fit-item__fix {
  display: none;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
  font-size: 0.85rem;
  color: var(--color-accent-hover);
  font-weight: 500;
}

.fit-item.checked .fit-item__fix {
  display: block;
}

/* --- How It Works --- */
.how-section {
  background: var(--color-bg);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  counter-reset: step-counter;
}

.step-card {
  position: relative;
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
}

.step-card::before {
  counter-increment: step-counter;
  content: counter(step-counter);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  color: white;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  border-radius: 50%;
  margin: 0 auto var(--space-md);
}

.step-card h4 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  margin-bottom: var(--space-sm);
}

.step-card p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin: 0 auto;
}

/* --- Footer --- */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255, 255, 255, 0.6);
  padding: var(--space-2xl) 0 var(--space-lg);
}

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

.footer__brand h3 {
  font-family: var(--font-heading);
  color: white;
  font-size: 1.3rem;
  margin-bottom: var(--space-sm);
}

.footer__brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  max-width: 320px;
}

.footer__col h4 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: var(--space-md);
}

.footer__col ul {
  list-style: none;
}

.footer__col li {
  margin-bottom: var(--space-sm);
}

.footer__col a {
  color: rgba(255,255,255,0.6);
  font-size: 0.88rem;
  transition: color var(--duration-fast);
}

.footer__col a:hover {
  color: white;
}

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
}

/* --- Scroll Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in.delay-1 { transition-delay: 0.1s; }
.fade-in.delay-2 { transition-delay: 0.2s; }
.fade-in.delay-3 { transition-delay: 0.3s; }

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .nav__links.open {
    display: flex;
  }

  .nav__mobile-toggle {
    display: block;
  }

  .calc-inputs {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .converter-select-group {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .converter-arrow {
    text-align: center;
    transform: rotate(90deg);
    padding: 0;
  }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .hero__trust {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .results__international {
    grid-template-columns: repeat(3, 1fr);
  }

  .fit-checklist {
    grid-template-columns: 1fr;
  }

  .results__primary-size {
    font-size: 2.8rem;
  }
}

@media (max-width: 480px) {
  .results__international {
    grid-template-columns: repeat(2, 1fr);
  }

  .sister-sizes__grid {
    gap: 6px;
  }

  .sister-size-chip {
    min-width: 58px;
    padding: var(--space-xs) var(--space-sm);
  }

  .calc-card__header {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}

/* --- Print Styles --- */
@media print {
  .nav, .footer, .calc-btn, .unit-toggle {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }

  .results__primary {
    background: #eee;
    color: black;
  }

  .results__primary-size,
  .results__primary h2 {
    color: black;
  }
}