/* ==========================================================================
   Skip Link (Accessibility)
   ========================================================================== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 9999;
  padding: 1rem 1.5rem;
  background: var(--color-primary-darker, #0369A1);
  color: var(--color-white, #fff);
  font-weight: 700;
  text-decoration: none;
  border-radius: 0 0 0.5rem 0;
}
.skip-link:focus {
  top: 0;
}

/* ==========================================================================
   Design Tokens
   ========================================================================== */
:root {
  --color-primary: #0EA5E9;
  --color-primary-dark: #0284C7;
  --color-primary-darker: #0369A1;
  --color-primary-light: #38BDF8;
  --color-primary-lightest: #E0F2FE;

  --color-accent-coral: #F97066;
  --color-accent-orange: #FB923C;
  --color-accent-green: #34D399;
  --color-accent-purple: #A78BFA;

  --color-white: #FFFFFF;
  --color-gray-50: #F8FAFC;
  --color-gray-100: #F1F5F9;
  --color-gray-200: #E2E8F0;
  --color-gray-300: #CBD5E1;
  --color-gray-400: #94A3B8;
  --color-gray-500: #64748B;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1E293B;
  --color-gray-900: #0F172A;

  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;

  --font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.75rem;
  --font-size-5xl: 3.5rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-black: 900;
  --line-height: 1.8;
  --line-height-tight: 1.25;
  --line-height-snug: 1.4;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --container-max: 1200px;
  --container-narrow: 800px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

/* ==========================================================================
   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-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-gray-700);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

body.nav-open { overflow: hidden; }
img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--color-primary-dark);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-primary); }
a:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 4px; }

ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-tight);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  letter-spacing: -0.02em;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

/* ==========================================================================
   Layout
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

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

.section { padding: var(--space-16) 0; }
.section--gray { background-color: var(--color-gray-50); }

.section__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-4);
}

.section__title {
  margin-bottom: var(--space-4);
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-gray-500);
  max-width: 600px;
  margin: 0 auto;
}

.section__header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: var(--space-10);
}

.section__header-row .section__title { margin-bottom: var(--space-2); }

.section__link {
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  white-space: nowrap;
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-gray-900);
  color: var(--color-white);
}

.site-header__inner {
  display: flex;
  align-items: center;
  padding: var(--space-3) 0;
  gap: var(--space-8);
}

.site-header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-header__logo img {
  width: 300px;
  height: auto;
  object-fit: contain;
}

.site-header__menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: 110;
}

.site-header__hamburger,
.site-header__hamburger::before,
.site-header__hamburger::after {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: var(--transition-base);
}

.site-header__hamburger { position: relative; }
.site-header__hamburger::before,
.site-header__hamburger::after { content: ''; position: absolute; left: 0; }
.site-header__hamburger::before { top: -7px; }
.site-header__hamburger::after { top: 7px; }

.site-header__menu-toggle[aria-expanded="true"] .site-header__hamburger { background-color: transparent; }
.site-header__menu-toggle[aria-expanded="true"] .site-header__hamburger::before { top: 0; transform: rotate(45deg); }
.site-header__menu-toggle[aria-expanded="true"] .site-header__hamburger::after { top: 0; transform: rotate(-45deg); }

/* Nav */
.site-nav { margin-left: auto; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-300);
  white-space: nowrap;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-nav__link:hover { color: var(--color-white); background: rgba(255,255,255,0.08); }
.site-nav__link.is-active { color: var(--color-primary-light); }

.site-nav__icon { display: flex; align-items: center; }
.site-nav__icon .icon { stroke: currentColor; }

/* Header actions */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
}

.site-header__search {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-full);
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
  cursor: pointer;
  min-width: 180px;
  transition: background var(--transition-fast);
}

.site-header__search:hover { background: rgba(255,255,255,0.12); }
.site-header__search .icon { width: 16px; height: 16px; }

.btn-header {
  padding: var(--space-2) var(--space-5);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-fast);
  white-space: nowrap;
}

.btn-header:hover { background: var(--color-primary-dark); color: var(--color-white); }

/* ==========================================================================
   Breadcrumb
   ========================================================================== */
.breadcrumb {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-gray-100);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: '›';
  margin-right: var(--space-2);
  color: var(--color-gray-300);
}

.breadcrumb__item a { color: var(--color-gray-500); }
.breadcrumb__item a:hover { color: var(--color-primary); }
.breadcrumb__item span[aria-current="page"] { color: var(--color-gray-700); font-weight: var(--font-weight-medium); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-gray-900);
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(15,23,42,0.85) 0%, rgba(15,23,42,0.5) 50%, rgba(15,23,42,0.2) 100%);
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 600px;
  color: var(--color-white);
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  background: rgba(14,165,233,0.2);
  border: 1px solid rgba(14,165,233,0.3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary-light);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-6);
}

.hero__title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-black);
  color: var(--color-white);
  margin-bottom: var(--space-6);
  line-height: 1.1;
}

.hero__title em {
  font-style: italic;
  color: var(--color-primary-light);
  margin-right: 0.15em;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-gray-300);
  margin-bottom: var(--space-8);
  line-height: var(--line-height);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.hero__wave {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 60px;
  z-index: 3;
}

.hero__wave svg {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 100%;
}

/* ==========================================================================
   Page Hero
   ========================================================================== */
.page-hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-16) 0;
  text-align: center;
}

.page-hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

.page-hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,23,42,0.8) 0%, rgba(2,132,199,0.7) 100%);
}

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

.page-hero__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-black);
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.page-hero__description {
  font-size: var(--font-size-lg);
  color: rgba(255,255,255,0.85);
  max-width: 600px;
  margin: 0 auto;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 2px solid transparent;
  border-radius: var(--radius-full);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  min-height: 48px;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
}
.btn--primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn--secondary {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.3);
}
.btn--secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.6);
  color: var(--color-white);
}

.btn--outline {
  background: transparent;
  color: var(--color-gray-700);
  border-color: var(--color-gray-300);
}
.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--ocean {
  background: var(--color-primary);
  color: var(--color-white);
}
.btn--ocean:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
  min-height: 56px;
}

/* ==========================================================================
   Cards
   ========================================================================== */
.card-grid {
  display: grid;
  gap: var(--space-6);
}

.card-grid--2 { grid-template-columns: repeat(2, 1fr); }
.card-grid--3 { grid-template-columns: repeat(3, 1fr); }
.card-grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-gray-100);
  padding: var(--space-6);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

a.card { display: block; text-decoration: none; color: inherit; }
a.card:hover { color: inherit; }

/* Icon Card (Knowledge Base style) */
.card--icon {
  padding: var(--space-8) var(--space-6);
  text-align: left;
  border: 1px solid var(--color-gray-200);
}

.card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
  color: var(--color-white);
}

.card__icon .icon { width: 24px; height: 24px; }

.card__icon--blue { background: var(--color-primary); }
.card__icon--coral { background: var(--color-accent-coral); }
.card__icon--green { background: var(--color-accent-green); }
.card__icon--orange { background: var(--color-accent-orange); }
.card__icon--purple { background: var(--color-accent-purple); }

.card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-2);
}

.card__text {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-4);
  line-height: var(--line-height);
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  color: var(--color-primary);
}

.card__link::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.card__link:hover::after { transform: translateX(4px); }

/* Image card */
.card--image { border: none; box-shadow: var(--shadow-sm); padding: 0; }

.card--image .card__img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.card--image .card__body { padding: var(--space-6); }
.card--image .card__body .card__icon { margin-bottom: var(--space-4); }

/* Overlay card (image with text on top) */
.card--overlay {
  position: relative;
  border: none;
  border-radius: var(--radius-xl);
  overflow: hidden;
  min-height: 300px;
  display: flex;
  align-items: flex-end;
  padding: 0;
}

.card--overlay .card__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.card--overlay:hover .card__img { transform: scale(1.05); }

.card--overlay .card__body {
  position: relative;
  z-index: 1;
  padding: var(--space-6);
  width: 100%;
  background: linear-gradient(to top, rgba(15,23,42,0.85) 0%, rgba(15,23,42,0.4) 60%, transparent 100%);
  color: var(--color-white);
}

.card--overlay .card__title { color: var(--color-white); font-size: var(--font-size-lg); }
.card--overlay .card__text { color: rgba(255,255,255,0.8); }

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.02em;
}

.badge--beginner { background: rgba(52,211,153,0.15); color: #059669; }
.badge--intermediate { background: rgba(14,165,233,0.15); color: #0284C7; }
.badge--advanced { background: rgba(251,146,60,0.15); color: #EA580C; }
.badge--family { background: rgba(167,139,250,0.15); color: #7C3AED; }

/* ==========================================================================
   Feature List
   ========================================================================== */
.feature-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.feature-item {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
}

.feature-item__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--color-primary-lightest);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.feature-item__icon .icon { width: 24px; height: 24px; }

.feature-item__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-1);
}

.feature-item__text {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   Split (two-column image + text)
   ========================================================================== */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.split--reverse { direction: rtl; }
.split--reverse > * { direction: ltr; }

.split__image {
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.split__image img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* ==========================================================================
   Photo Break
   ========================================================================== */
.photo-break {
  position: relative;
  height: 300px;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}

@media (max-width: 768px) {
  .photo-break { height: 200px; background-attachment: scroll; }
}

/* ==========================================================================
   CTA / Newsletter
   ========================================================================== */
.cta-newsletter {
  background: var(--color-gray-900);
  padding: var(--space-20) 0;
  text-align: center;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.cta-newsletter::before {
  content: '';
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.15;
}

.cta-newsletter > .container { position: relative; z-index: 1; }

.cta-newsletter__title {
  font-size: var(--font-size-3xl);
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.cta-newsletter__text {
  color: var(--color-gray-400);
  margin-bottom: var(--space-8);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.cta-newsletter__form {
  display: flex;
  gap: var(--space-3);
  max-width: 480px;
  margin: 0 auto;
}

.cta-newsletter__input {
  flex: 1;
  padding: var(--space-3) var(--space-5);
  border: 1px solid var(--color-gray-700);
  border-radius: var(--radius-full);
  background: var(--color-gray-800);
  color: var(--color-white);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
}

.cta-newsletter__input::placeholder { color: var(--color-gray-500); }
.cta-newsletter__input:focus { outline: none; border-color: var(--color-primary); }

.cta-newsletter__btn {
  padding: var(--space-3) var(--space-8);
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-full);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast);
}

.cta-newsletter__btn:hover { background: var(--color-primary-dark); }

/* Simple CTA section */
.cta-section {
  position: relative;
  overflow: hidden;
  padding: var(--space-20) 0;
  text-align: center;
  color: var(--color-white);
}

.cta-section__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

.cta-section__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,23,42,0.8) 0%, rgba(2,132,199,0.7) 100%);
}

.cta-section > .container { position: relative; z-index: 1; }

.cta-section__title { color: var(--color-white); margin-bottom: var(--space-4); }
.cta-section__text { color: rgba(255,255,255,0.85); margin-bottom: var(--space-8); max-width: 560px; margin-left: auto; margin-right: auto; font-size: var(--font-size-lg); }

/* ==========================================================================
   Content Pages
   ========================================================================== */
.page-content { }

.page-content h2 {
  margin-top: var(--space-12);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-gray-100);
}

.page-content h3 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
  color: var(--color-gray-800);
}

.page-content h4 { margin-top: var(--space-6); margin-bottom: var(--space-3); }
.page-content p { margin-bottom: var(--space-5); color: var(--color-gray-600); }

.page-content ul, .page-content ol { margin-bottom: var(--space-5); padding-left: var(--space-6); }
.page-content ul { list-style: disc; }
.page-content ol { list-style: decimal; }
.page-content li { margin-bottom: var(--space-2); color: var(--color-gray-600); }
.page-content li::marker { color: var(--color-primary); }

.info-box,
.warning-box {
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-5);
  margin: var(--space-8) 0;
}
.info-box { background: var(--color-primary-lightest); }
.warning-box { background: #FEF3C7; border-left-color: var(--color-warning); }

.info-box > :first-child,
.warning-box > :first-child { margin-top: 0; }
.info-box > :last-child,
.warning-box > :last-child { margin-bottom: 0; }

.info-box__title { font-size: var(--font-size-lg); margin-bottom: var(--space-2); color: var(--color-primary-dark); }
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-item { border-bottom: 1px solid var(--color-gray-200); padding: var(--space-6) 0; }

.faq-item__question {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-800);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}

.faq-item__question::after {
  content: '+';
  font-size: var(--font-size-xl);
  color: var(--color-primary);
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-primary-lightest);
  transition: transform var(--transition-fast);
}

.faq-item.is-open .faq-item__question::after { content: '−'; }
.faq-item__answer { display: none; padding-top: var(--space-4); color: var(--color-gray-500); }
.faq-item.is-open .faq-item__answer { display: block; }

/* ==========================================================================
   Glossary
   ========================================================================== */
.glossary-term { padding: var(--space-5) 0; border-bottom: 1px solid var(--color-gray-100); }
.glossary-term__word { font-size: var(--font-size-lg); font-weight: var(--font-weight-bold); color: var(--color-gray-800); margin-bottom: var(--space-1); }
.glossary-term__reading { font-size: var(--font-size-sm); color: var(--color-gray-400); margin-bottom: var(--space-2); }
.glossary-term__definition { color: var(--color-gray-500); }

/* ==========================================================================
   Contact Form
   ========================================================================== */
.form-group { margin-bottom: var(--space-6); }
.form-label { display: block; font-weight: var(--font-weight-semibold); margin-bottom: var(--space-2); font-size: var(--font-size-sm); color: var(--color-gray-700); }
.form-label .required { color: var(--color-danger); margin-left: var(--space-1); }

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-gray-800);
  background: var(--color-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-lightest);
}

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

/* ==========================================================================
   Blog Notice
   ========================================================================== */
.blog-notice {
  text-align: center;
  padding: var(--space-12);
  background: var(--color-gray-50);
  border-radius: var(--radius-2xl);
  border: 2px dashed var(--color-gray-200);
}

.blog-notice__icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-lightest);
  border-radius: var(--radius-lg);
  margin: 0 auto var(--space-6);
  color: var(--color-primary);
}

.blog-notice__icon .icon { width: 32px; height: 32px; }
.blog-notice__title { margin-bottom: var(--space-3); }
.blog-notice__text { color: var(--color-gray-500); max-width: 480px; margin: 0 auto; }

/* ==========================================================================
   Ad Unit
   ========================================================================== */
.ad-unit {
  margin: var(--space-8) auto;
  padding: var(--space-4) 0;
  text-align: center;
  min-height: 90px;
  overflow: hidden;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--space-16) 0 var(--space-8);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.site-footer__logo {
  height: 60px;
  width: auto;
  margin-bottom: var(--space-4);
}

.site-footer__tagline { font-size: var(--font-size-sm); color: var(--color-gray-500); margin-bottom: var(--space-6); }

.site-footer__social {
  display: flex;
  gap: var(--space-3);
}

.site-footer__social-link {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-gray-800);
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.site-footer__social-link:hover { background: var(--color-primary); color: var(--color-white); }

.site-footer__heading {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  margin-bottom: var(--space-5);
}

.site-footer__nav li { margin-bottom: var(--space-3); }
.site-footer__nav a { color: var(--color-gray-400); font-size: var(--font-size-sm); }
.site-footer__nav a:hover { color: var(--color-white); }

.site-footer__subscribe-text { font-size: var(--font-size-sm); color: var(--color-gray-500); margin-bottom: var(--space-4); }

.site-footer__subscribe-form {
  display: flex;
  gap: var(--space-2);
}

.site-footer__subscribe-input {
  flex: 1;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-gray-700);
  border-radius: var(--radius-sm);
  background: var(--color-gray-800);
  color: var(--color-white);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
}

.site-footer__subscribe-input::placeholder { color: var(--color-gray-600); }

.site-footer__subscribe-btn {
  padding: var(--space-2) var(--space-5);
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
}

.site-footer__subscribe-btn:hover { background: var(--color-primary-dark); }

.site-footer__bottom {
  border-top: 1px solid var(--color-gray-800);
  padding-top: var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-xs);
  color: var(--color-gray-600);
}

.site-footer__bottom-links {
  display: flex;
  gap: var(--space-6);
}

.site-footer__bottom-links a { color: var(--color-gray-500); font-size: var(--font-size-xs); }
.site-footer__bottom-links a:hover { color: var(--color-white); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .site-nav__icon { display: none; }
  .site-header__search { display: none; }
  .card-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .card-grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
  }

  .section { padding: var(--space-12) 0; }

  .site-header__inner { padding: var(--space-4) 0; }
  .site-header__logo img { width: 200px; }
  .site-header__menu-toggle { display: block; margin-left: auto; }

  .site-nav {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: 300px;
    max-width: 85vw;
    background: var(--color-gray-900);
    box-shadow: var(--shadow-xl);
    padding: 72px var(--space-6) var(--space-6);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    z-index: 105;
    overflow-y: auto;
  }

  .site-nav.is-open { transform: translateX(0); }

  .site-nav__list { flex-direction: column; align-items: stretch; gap: var(--space-1); }
  .site-nav__link { padding: var(--space-3) var(--space-4); font-size: var(--font-size-base); border-radius: var(--radius-sm); }
  .site-nav__icon { display: inline-flex; }

  .site-header__actions { display: none; }

  .hero { min-height: 420px; }
  .hero__title { font-size: var(--font-size-3xl); }
  .hero__actions { flex-direction: column; }

  .card-grid--2, .card-grid--3, .card-grid--4 { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: var(--space-8); }
  .split--reverse { direction: ltr; }

  .site-footer__grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .site-footer__bottom { flex-direction: column; gap: var(--space-4); text-align: center; }

  .cta-newsletter__form { flex-direction: column; }

  .page-hero { padding: var(--space-12) 0; }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--space-4); }
  .site-header__inner.container { padding: var(--space-4) var(--space-4); }
}

/* ==========================================================================
   Utilities
   ========================================================================== */
.text-center { text-align: center; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* SVG Icon base */
.icon { display: inline-block; vertical-align: middle; flex-shrink: 0; }