/* ============================================
   GERADOR DE CPF — Design System
   Light classic theme · System fonts · Premium
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --clr-bg: #f5f7fa;
  --clr-bg-alt: #ffffff;
  --clr-surface: #ffffff;
  --clr-surface-hover: #f0f4f8;
  --clr-border: #e2e8f0;
  --clr-border-light: #edf2f7;

  --clr-primary: #2563eb;
  --clr-primary-light: #3b82f6;
  --clr-primary-dark: #1d4ed8;
  --clr-primary-bg: #eff6ff;
  --clr-primary-border: #bfdbfe;

  --clr-accent: #059669;
  --clr-accent-light: #10b981;
  --clr-accent-bg: #ecfdf5;
  --clr-accent-border: #a7f3d0;

  --clr-danger: #dc2626;
  --clr-danger-bg: #fef2f2;
  --clr-danger-border: #fecaca;

  --clr-warning: #d97706;
  --clr-warning-bg: #fffbeb;

  --clr-text: #1e293b;
  --clr-text-secondary: #475569;
  --clr-text-muted: #94a3b8;

  /* Typography — System Font Stack */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", Consolas,
    "DejaVu Sans Mono", monospace;

  /* Sizing */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.1);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 16px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 4px 8px rgba(0, 0, 0, 0.06), 0 12px 36px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast: 150ms var(--ease-out);
  --transition-base: 250ms var(--ease-out);
  --transition-slow: 400ms var(--ease-out);

  /* Layout */
  --container-max: 1140px;
  --nav-height: 64px;
}

/* --- Reset & Base --- */
*,
*::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(--clr-text);
  background: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--clr-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--clr-primary-dark);
}

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

ul,
ol {
  list-style: none;
}

/* --- Layout Utilities --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section--sm {
  padding: 48px 0;
}

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--clr-text);
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
}

h3 {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
}

h4 {
  font-size: 1.125rem;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-primary);
  background: var(--clr-primary-bg);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-title {
  margin-bottom: 16px;
}

.section-subtitle {
  color: var(--clr-text-secondary);
  font-size: 1.1rem;
  max-width: 640px;
}

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

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

.text-secondary {
  color: var(--clr-text-secondary);
}

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

.text-primary {
  color: var(--clr-primary);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border-light);
  z-index: 1000;
  transition: box-shadow var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--clr-text);
  text-decoration: none;
}

.nav-brand:hover {
  color: var(--clr-text);
}

.nav-brand .brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-light));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--clr-primary);
  background: var(--clr-primary-bg);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--clr-text);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-light));
  color: #fff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.btn--primary:hover {
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
  transform: translateY(-1px);
  color: #fff;
}

.btn--accent {
  background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent-light));
  color: #fff;
  box-shadow: 0 2px 8px rgba(5, 150, 105, 0.3);
}

.btn--accent:hover {
  box-shadow: 0 4px 16px rgba(5, 150, 105, 0.4);
  transform: translateY(-1px);
  color: #fff;
}

.btn--outline {
  background: var(--clr-bg-alt);
  color: var(--clr-text);
  border: 1.5px solid var(--clr-border);
}

.btn--outline:hover {
  border-color: var(--clr-primary);
  color: var(--clr-primary);
  background: var(--clr-primary-bg);
}

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

.btn--ghost:hover {
  background: var(--clr-surface-hover);
  color: var(--clr-text);
}

.btn--lg {
  padding: 16px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn--sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn--icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* Ripple Effect */
.btn .ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  transform: scale(0);
  animation: ripple-anim 0.6s linear;
  pointer-events: none;
}

@keyframes ripple-anim {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* --- Cards --- */
.card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.card--flat {
  box-shadow: none;
  border: 1px solid var(--clr-border);
}

.card--flat:hover {
  box-shadow: none;
  transform: none;
}

.card--accent {
  border-left: 4px solid var(--clr-primary);
}

/* --- Hero Section --- */
.hero {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 80px;
  background: linear-gradient(180deg, var(--clr-primary-bg) 0%, var(--clr-bg) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(5, 150, 105, 0.05) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

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

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-title {
  margin-bottom: 16px;
  letter-spacing: -2px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--clr-text-secondary);
  max-width: 560px;
  margin-bottom: 32px;
}

/* --- Tool Card (Generator / Validator) --- */
.tool-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  max-width: 580px;
}

.tool-card__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.tool-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.tool-card__icon--gen {
  background: var(--clr-primary-bg);
  color: var(--clr-primary);
}

.tool-card__icon--val {
  background: var(--clr-accent-bg);
  color: var(--clr-accent);
}

.tool-card__title {
  font-size: 1.3rem;
}

/* CPF Output Display */
.cpf-output {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--clr-bg);
  border: 2px dashed var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
  transition: all var(--transition-base);
}

.cpf-output.generated {
  border-color: var(--clr-primary-border);
  background: var(--clr-primary-bg);
  border-style: solid;
}

.cpf-output__value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: 0.05em;
  user-select: all;
  transition: color var(--transition-fast);
}

.cpf-output__placeholder {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--clr-text-muted);
  letter-spacing: 0.05em;
}

/* Generator Controls */
.gen-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.gen-controls .btn {
  flex: 1;
}

/* Options */
.tool-options {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  flex-wrap: wrap;
}

.tool-options label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
}

/* Toggle Switch */
.toggle {
  position: relative;
  width: 40px;
  height: 22px;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle__slider {
  position: absolute;
  inset: 0;
  background: var(--clr-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.toggle__slider::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: #fff;
  border-radius: 50%;
  transition: transform var(--transition-fast);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.toggle input:checked+.toggle__slider {
  background: var(--clr-primary);
}

.toggle input:checked+.toggle__slider::before {
  transform: translateX(18px);
}

/* --- Validator Input --- */
.validator-input {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.validator-input input {
  flex: 1;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  border: 2px solid var(--clr-border);
  border-radius: var(--radius-md);
  background: var(--clr-bg);
  color: var(--clr-text);
  outline: none;
  transition: border-color var(--transition-fast);
}

.validator-input input:focus {
  border-color: var(--clr-primary);
}

.validator-input input::placeholder {
  color: var(--clr-text-muted);
  font-weight: 400;
}

/* Validation Result */
.validation-result {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  animation: slideUp 0.3s var(--ease-spring);
}

.validation-result.show {
  display: flex;
}

.validation-result.valid {
  background: var(--clr-accent-bg);
  color: var(--clr-accent);
  border: 1px solid var(--clr-accent-border);
}

.validation-result.invalid {
  background: var(--clr-danger-bg);
  color: var(--clr-danger);
  border: 1px solid var(--clr-danger-border);
}

.validation-result .result-icon {
  font-size: 1.3rem;
}

/* --- Bulk Generator --- */
.bulk-output {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
  margin-top: 16px;
}

.bulk-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--clr-bg);
  border: 1px solid var(--clr-border-light);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.bulk-item:hover {
  background: var(--clr-primary-bg);
  border-color: var(--clr-primary-border);
}

.bulk-item .copy-icon {
  opacity: 0;
  transition: opacity var(--transition-fast);
  color: var(--clr-primary);
}

.bulk-item:hover .copy-icon {
  opacity: 1;
}

.bulk-item.copied {
  background: var(--clr-accent-bg);
  border-color: var(--clr-accent-border);
}

/* --- Feature Grid --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.feature-card {
  padding: 28px;
}

.feature-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.feature-card__icon--blue {
  background: var(--clr-primary-bg);
  color: var(--clr-primary);
}

.feature-card__icon--green {
  background: var(--clr-accent-bg);
  color: var(--clr-accent);
}

.feature-card__icon--yellow {
  background: var(--clr-warning-bg);
  color: var(--clr-warning);
}

.feature-card__title {
  margin-bottom: 8px;
}

.feature-card__desc {
  color: var(--clr-text-secondary);
  font-size: 0.95rem;
}

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--clr-bg);
  padding: 4px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  border: 1px solid var(--clr-border-light);
}

.tab-btn {
  flex: 1;
  padding: 10px 20px;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.tab-btn.active {
  background: var(--clr-surface);
  color: var(--clr-primary);
  box-shadow: var(--shadow-sm);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.3s var(--ease-out);
}

/* --- FAQ Accordion --- */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.accordion-item {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.accordion-item:hover {
  border-color: var(--clr-border);
}

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 18px 24px;
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--clr-text);
  cursor: pointer;
  text-align: left;
  gap: 12px;
}

.accordion-trigger:hover {
  color: var(--clr-primary);
}

.accordion-chevron {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--clr-text-muted);
  transition: transform var(--transition-base);
}

.accordion-item.open .accordion-chevron {
  transform: rotate(180deg);
  color: var(--clr-primary);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.accordion-body {
  padding: 0 24px 18px;
  color: var(--clr-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* --- Page Header (Inner Pages) --- */
.page-header {
  padding-top: calc(var(--nav-height) + 48px);
  padding-bottom: 48px;
  background: linear-gradient(180deg, var(--clr-primary-bg) 0%, var(--clr-bg) 100%);
}

/* --- Info Blocks --- */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.info-card {
  padding: 28px;
}

.info-card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.info-card p {
  color: var(--clr-text-secondary);
  line-height: 1.7;
}

/* CPF Anatomy Diagram */
.cpf-anatomy {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 28px;
  flex-wrap: wrap;
}

.cpf-digit-group {
  display: flex;
  gap: 4px;
}

.cpf-digit {
  width: 44px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  border: 2px solid;
}

.cpf-digit--region {
  background: var(--clr-primary-bg);
  border-color: var(--clr-primary-border);
  color: var(--clr-primary);
}

.cpf-digit--check {
  background: var(--clr-accent-bg);
  border-color: var(--clr-accent-border);
  color: var(--clr-accent);
}

.cpf-separator {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--clr-text-muted);
}

.cpf-legend {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 16px;
  font-size: 0.85rem;
  font-weight: 600;
}

.cpf-legend span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.legend-dot--region {
  background: var(--clr-primary);
}

.legend-dot--check {
  background: var(--clr-accent);
}

/* --- Footer --- */
.footer {
  background: var(--clr-bg-alt);
  border-top: 1px solid var(--clr-border-light);
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--clr-text);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-desc {
  color: var(--clr-text-secondary);
  font-size: 0.9rem;
  max-width: 320px;
  line-height: 1.7;
}

.footer h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--clr-text-muted);
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
}

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

.footer-bottom {
  border-top: 1px solid var(--clr-border-light);
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--clr-text-muted);
}

/* --- Toast --- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-text);
  animation: toastIn 0.4s var(--ease-spring), toastOut 0.3s var(--ease-out) forwards;
  animation-delay: 0s, 2.2s;
}

.toast .toast-icon {
  font-size: 1.1rem;
}

/* --- Animations --- */
@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(40px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes toastOut {
  from {
    opacity: 1;
    transform: translateX(0);
  }

  to {
    opacity: 0;
    transform: translateX(40px);
  }
}

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

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

/* Stagger children */
.reveal-stagger>* {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

.reveal-stagger.visible>*:nth-child(1) {
  transition-delay: 0s;
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger.visible>*:nth-child(2) {
  transition-delay: 0.08s;
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger.visible>*:nth-child(3) {
  transition-delay: 0.16s;
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger.visible>*:nth-child(4) {
  transition-delay: 0.24s;
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger.visible>*:nth-child(5) {
  transition-delay: 0.32s;
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger.visible>*:nth-child(6) {
  transition-delay: 0.40s;
  opacity: 1;
  transform: translateY(0);
}

/* --- Quantity Selector --- */
.qty-selector {
  display: flex;
  align-items: center;
  gap: 4px;
}

.qty-selector button {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--clr-text-secondary);
  transition: all var(--transition-fast);
}

.qty-selector button:hover {
  background: var(--clr-primary-bg);
  border-color: var(--clr-primary-border);
  color: var(--clr-primary);
}

.qty-selector .qty-value {
  width: 36px;
  text-align: center;
  font-weight: 700;
  font-size: 0.95rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--clr-surface);
    border-bottom: 1px solid var(--clr-border);
    padding: 16px;
    box-shadow: var(--shadow-lg);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    padding-top: calc(var(--nav-height) + 32px);
    padding-bottom: 48px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .tool-card {
    padding: 24px;
  }

  .cpf-output__value,
  .cpf-output__placeholder {
    font-size: 1.4rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .gen-controls {
    flex-direction: column;
  }

  .section {
    padding: 48px 0;
  }

  .cpf-digit {
    width: 34px;
    height: 44px;
    font-size: 1.1rem;
  }

  .bulk-output {
    grid-template-columns: 1fr;
  }

  .validator-input {
    flex-direction: column;
  }

  .tabs {
    flex-direction: column;
  }
}

/* --- Prose (for content pages) --- */
.prose {
  max-width: 720px;
  line-height: 1.8;
  color: var(--clr-text-secondary);
}

.prose h2 {
  margin-top: 40px;
  margin-bottom: 16px;
  color: var(--clr-text);
}

.prose h3 {
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--clr-text);
}

.prose p {
  margin-bottom: 16px;
}

.prose ul,
.prose ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 6px;
}

.prose strong {
  color: var(--clr-text);
  font-weight: 600;
}

/* Disclaimer Banner */
.disclaimer {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 20px;
  background: var(--clr-warning-bg);
  border: 1px solid #fde68a;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--clr-warning);
  line-height: 1.6;
}

.disclaimer-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
  margin-top: 2px;
}