/* ============================================================
   aofinance — Main Stylesheet
   Color Palette (Blue Base)
   - Primary  : #1e40af (deep blue)
   - Accent   : #3b82f6 (blue-500)
   - Light    : #60a5fa (blue-400)
   - Surface  : #eff6ff (blue-50)
   - Dark BG  : #0f172a (slate-900)
   - Text Main: #0f172a
   - Text Sub : #64748b
============================================================ */

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

:root {
  --blue-50 : #eff6ff;
  --blue-100: #dbeafe;
  --blue-200: #bfdbfe;
  --blue-300: #93c5fd;
  --blue-400: #60a5fa;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --blue-800: #1e40af;
  --blue-900: #1e3a8a;
  --indigo   : #6366f1;
  --slate-50 : #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-500: #64748b;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --white    : #ffffff;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 16px rgba(30,64,175,.12), 0 2px 6px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 40px rgba(30,64,175,.18), 0 4px 12px rgba(0,0,0,.08);
  --shadow-xl: 0 20px 60px rgba(30,64,175,.22);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --header-h : 68px;
  --transition: .25s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans JP', 'Inter', sans-serif;
  color: var(--slate-900);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a   { text-decoration: none; color: inherit; }
button { cursor: pointer; font-family: inherit; }

.container {
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

/* ============================================================
   HEADER
============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--blue-100);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow-md); }

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -.5px;
  color: var(--slate-900);
  transition: opacity var(--transition);
}
.logo:hover { opacity: .8; }
.logo-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-400));
  border-radius: 10px;
  display: grid; place-items: center;
  color: var(--white);
  font-size: .95rem;
  box-shadow: 0 4px 12px rgba(59,130,246,.35);
}
.logo-accent { color: var(--blue-600); }

/* Desktop Nav */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--slate-700);
  transition: background var(--transition), color var(--transition);
}
.nav-link:hover { background: var(--blue-50); color: var(--blue-600); }
.nav-link.active {
  background: var(--blue-600);
  color: var(--white);
  box-shadow: 0 4px 12px rgba(37,99,235,.3);
}
.nav-link i { font-size: .85rem; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 6px;
  border-radius: 8px;
  transition: background var(--transition);
}
.hamburger:hover { background: var(--blue-50); }
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--slate-700);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Nav */
.nav-mobile {
  display: none;
  flex-direction: column;
  background: var(--white);
  border-top: 1px solid var(--blue-100);
  padding: 12px 0;
  box-shadow: 0 8px 24px rgba(0,0,0,.08);
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}
.nav-mobile.open { max-height: 300px; }
.nav-mobile-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  font-size: .95rem;
  font-weight: 500;
  color: var(--slate-700);
  transition: background var(--transition), color var(--transition);
}
.nav-mobile-link:hover { background: var(--blue-50); color: var(--blue-600); }
.nav-mobile-link.active { color: var(--blue-600); font-weight: 600; }

/* ============================================================
   TAB SECTIONS
============================================================ */
.tab-section { display: none; }
.tab-section.active { display: block; }

/* ============================================================
   HERO
============================================================ */
.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  background: linear-gradient(135deg, var(--blue-900) 0%, var(--blue-800) 45%, var(--blue-600) 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
}

/* BG Shapes */
.hero-bg-shapes { position: absolute; inset: 0; pointer-events: none; }
.shape {
  position: absolute;
  border-radius: 50%;
  opacity: .12;
}
.shape-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, var(--blue-300), transparent);
  top: -200px; right: -150px;
}
.shape-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, var(--blue-400), transparent);
  bottom: -100px; left: -100px;
  opacity: .15;
}
.shape-3 {
  width: 200px; height: 200px;
  background: var(--white);
  top: 20%; left: 8%;
  opacity: .04;
}
.shape-4 {
  width: 120px; height: 120px;
  background: var(--white);
  bottom: 15%; right: 30%;
  opacity: .06;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding-block: clamp(60px, 10vw, 100px);
  max-width: 860px;
  margin-inline: auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.25);
  color: var(--blue-200);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
  backdrop-filter: blur(8px);
}
.hero-badge i { color: #fbbf24; font-size: .75rem; }

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--white);
  letter-spacing: -.02em;
  margin-bottom: 28px;
  text-shadow: 0 2px 20px rgba(0,0,0,.2);
}

.hero-sub {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--blue-200);
  line-height: 1.9;
  margin-bottom: 36px;
  font-weight: 300;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-bottom: 52px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 999px;
  font-size: .95rem;
  font-weight: 600;
  border: 2px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--white);
  color: var(--blue-700);
  box-shadow: 0 6px 24px rgba(255,255,255,.25);
}
.btn-primary:hover { box-shadow: 0 10px 32px rgba(255,255,255,.35); }
.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,.5);
}
.btn-outline:hover {
  background: rgba(255,255,255,.1);
  border-color: var(--white);
}
.btn-white {
  background: var(--white);
  color: var(--blue-700);
  box-shadow: var(--shadow-md);
}
.btn-white:hover { box-shadow: var(--shadow-lg); }
.btn-outline-white {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,.6);
}
.btn-outline-white:hover {
  background: rgba(255,255,255,.12);
  border-color: var(--white);
}

/* Hero Stats */
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  backdrop-filter: blur(8px);
  min-width: 90px;
}
.stat-icon { color: var(--blue-300); font-size: 1.1rem; }
.stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--white);
  font-family: 'Inter', sans-serif;
  line-height: 1;
}
.stat-plus { font-size: 1.1rem; color: var(--blue-300); }
.stat-label { font-size: .75rem; color: var(--blue-200); font-weight: 500; }

/* Hero Visual (Chart) */
.hero-visual {
  position: absolute;
  right: clamp(20px, 6vw, 80px);
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  pointer-events: none;
}
.chart-mock {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: var(--radius-xl);
  padding: 24px;
  backdrop-filter: blur(12px);
  width: clamp(240px, 30vw, 320px);
  box-shadow: 0 24px 60px rgba(0,0,0,.25);
}
.chart-svg { width: 100%; height: auto; display: block; }
.chart-label { margin-top: 12px; display: flex; justify-content: flex-end; }
.chart-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(34,197,94,.2);
  border: 1px solid rgba(34,197,94,.35);
  color: #86efac;
  font-size: .8rem;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: 999px;
}

/* ============================================================
   SECTION COMMON
============================================================ */
.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 800;
  color: var(--slate-900);
  margin-bottom: 10px;
  letter-spacing: -.02em;
}
.section-title-icon {
  width: 42px; height: 42px;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-400));
  border-radius: 12px;
  display: grid; place-items: center;
  color: var(--white);
  font-size: 1rem;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(59,130,246,.3);
}
.section-desc {
  color: var(--slate-500);
  font-size: .95rem;
  margin-bottom: 32px;
}

/* ============================================================
   SEARCH SECTION
============================================================ */
.search-section { padding: 64px 0 48px; }

.search-bar-wrap { margin-bottom: 24px; }
.search-bar {
  position: relative;
  max-width: 560px;
}
.search-bar .search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--slate-500);
  font-size: .95rem;
  pointer-events: none;
}
.search-bar input {
  width: 100%;
  padding: 14px 48px 14px 46px;
  border: 2px solid var(--blue-200);
  border-radius: 999px;
  font-size: .95rem;
  font-family: inherit;
  color: var(--slate-900);
  background: var(--white);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.search-bar input:focus {
  border-color: var(--blue-500);
  box-shadow: 0 0 0 4px rgba(59,130,246,.12);
}
.search-bar input::placeholder { color: var(--slate-300); }
.search-clear {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--slate-200);
  border: none;
  border-radius: 50%;
  width: 26px; height: 26px;
  display: grid; place-items: center;
  color: var(--slate-500);
  font-size: .75rem;
  transition: background var(--transition);
}
.search-clear:hover { background: var(--slate-300); }

/* Keyword Chips */
.keyword-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 500;
  border: 2px solid var(--blue-200);
  color: var(--slate-600);
  background: var(--white);
  cursor: pointer;
  transition: all var(--transition);
}
.chip:hover {
  border-color: var(--blue-400);
  color: var(--blue-600);
  background: var(--blue-50);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.chip.active {
  background: var(--blue-600);
  border-color: var(--blue-600);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(37,99,235,.3);
}

/* ============================================================
   CATEGORIES SECTION
============================================================ */
.categories-section { padding: 0 0 72px; }

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

/* --- Card base --- */
.cat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 28px 28px 22px;
  background: var(--white);
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  overflow: hidden;
}

/* 背景に薄く浮かぶ大アイコン */
.cat-card-bg-icon {
  position: absolute;
  bottom: -10px;
  right: -6px;
  font-size: 5.5rem;
  color: var(--cat-color, var(--blue-500));
  opacity: .07;
  line-height: 1;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  transform: rotate(-10deg);
}

/* カード上部: アイコン + 英語タグ を横並び */
.cat-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* カラーアイコン */
.cat-card-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: grid; place-items: center;
  font-size: 1.3rem;
  color: var(--white);
  background: linear-gradient(135deg,
    var(--cat-color, var(--blue-500)),
    color-mix(in srgb, var(--cat-color, var(--blue-500)) 70%, #fff));
  box-shadow: 0 6px 18px color-mix(in srgb, var(--cat-color, var(--blue-500)) 35%, transparent);
  flex-shrink: 0;
  transition: transform var(--transition), box-shadow var(--transition);
}

/* 英語サブラベル */
.cat-card-tag {
  font-family: 'Inter', sans-serif;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--cat-color, var(--blue-500));
  background: color-mix(in srgb, var(--cat-color, var(--blue-500)) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--cat-color, var(--blue-500)) 25%, transparent);
  padding: 3px 10px;
  border-radius: 999px;
}

/* タイトル */
.cat-card-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--slate-900);
  letter-spacing: -.01em;
}

/* 矢印 */
.cat-card-arrow {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 5px;
  color: var(--slate-300);
  font-size: .8rem;
  font-weight: 600;
  transition: color var(--transition), transform var(--transition), gap var(--transition);
}

/* Hover */
.cat-card:hover {
  border-color: color-mix(in srgb, var(--cat-color, var(--blue-500)) 40%, transparent);
  box-shadow: 0 12px 36px color-mix(in srgb, var(--cat-color, var(--blue-500)) 18%, transparent),
              0 4px 12px rgba(0,0,0,.06);
  transform: translateY(-5px);
}
.cat-card:hover .cat-card-bg-icon {
  opacity: .13;
  transform: rotate(-6deg) scale(1.08);
}
.cat-card:hover .cat-card-icon {
  transform: scale(1.08);
  box-shadow: 0 10px 28px color-mix(in srgb, var(--cat-color, var(--blue-500)) 45%, transparent);
}
.cat-card:hover .cat-card-arrow {
  color: var(--cat-color, var(--blue-500));
  gap: 9px;
}
.cat-card:focus { outline: 3px solid var(--blue-400); outline-offset: 2px; }

/* ============================================================
   GUIDE / STEPS SECTION
============================================================ */
.guide-section {
  background: linear-gradient(180deg, var(--blue-50) 0%, var(--white) 100%);
  padding: 72px 0;
  border-top: 1px solid var(--blue-100);
  border-bottom: 1px solid var(--blue-100);
}
.steps-grid {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
}
.step-card {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 32px 28px;
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--blue-100);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}
.step-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.step-num {
  font-family: 'Inter', sans-serif;
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--blue-100);
  line-height: 1;
  letter-spacing: -.04em;
}
.step-icon {
  width: 48px; height: 48px;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-400));
  border-radius: 12px;
  display: grid; place-items: center;
  color: var(--white);
  font-size: 1.1rem;
  box-shadow: 0 6px 16px rgba(59,130,246,.3);
}
.step-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--slate-900);
}
.step-desc {
  font-size: .85rem;
  color: var(--slate-500);
  line-height: 1.7;
}
.step-connector {
  padding: 16px;
  color: var(--blue-300);
  font-size: 1.2rem;
  flex-shrink: 0;
}

/* ============================================================
   CTA SECTION
============================================================ */
.cta-section { padding: 64px 0 80px; }
.cta-card {
  background: linear-gradient(135deg, var(--blue-800) 0%, var(--blue-600) 60%, var(--indigo) 100%);
  border-radius: var(--radius-xl);
  padding: clamp(36px, 5vw, 52px) clamp(24px, 5vw, 52px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 28px;
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
}
.cta-card::before {
  content: '';
  position: absolute;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(255,255,255,.1), transparent);
  top: -100px; right: 60px;
  border-radius: 50%;
  pointer-events: none;
}
.cta-title {
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 800;
  color: var(--white);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.cta-title i { color: var(--blue-300); }
.cta-desc { color: var(--blue-200); font-size: .9rem; }
.cta-actions { display: flex; gap: 14px; flex-wrap: wrap; flex-shrink: 0; }

/* ============================================================
   PLACEHOLDER PAGES
============================================================ */
.placeholder-page {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-block: 80px;
  gap: 16px;
}
.placeholder-icon {
  width: 90px; height: 90px;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-400));
  border-radius: 24px;
  display: grid; place-items: center;
  font-size: 2.2rem;
  color: var(--white);
  box-shadow: 0 12px 32px rgba(59,130,246,.35);
  margin-bottom: 8px;
  animation: floatIcon 3s ease-in-out infinite;
}
.placeholder-icon.quiz-icon {
  background: linear-gradient(135deg, var(--indigo), #8b5cf6);
  box-shadow: 0 12px 32px rgba(99,102,241,.35);
}
@keyframes floatIcon {
  0%,100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}
.placeholder-title {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 800;
  color: var(--slate-900);
}
.placeholder-desc {
  color: var(--slate-500);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 400px;
}
.placeholder-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 16px;
}
.chip-static {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 500;
  background: var(--blue-50);
  border: 1.5px solid var(--blue-200);
  color: var(--blue-700);
}
.quiz-preview-cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
}
.quiz-preview-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 24px 32px;
  background: var(--white);
  border: 1.5px solid var(--blue-200);
  border-radius: var(--radius-lg);
  font-size: .9rem;
  font-weight: 600;
  color: var(--blue-700);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}
.quiz-preview-card i { font-size: 1.8rem; color: var(--blue-500); }
.quiz-preview-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }

/* ============================================================
   FOOTER
============================================================ */
.site-footer {
  background: var(--slate-900);
  color: var(--slate-300);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 40px;
  padding-block: 52px;
}
.footer-brand { max-width: 260px; }
.footer-brand .logo { margin-bottom: 12px; }
.footer-brand .logo-text { color: var(--white); }
.footer-brand .logo-accent { color: var(--blue-400); }
.footer-brand .logo-icon {
  background: linear-gradient(135deg, var(--blue-500), var(--blue-300));
}
.footer-tagline {
  font-size: .85rem;
  color: var(--slate-400);
  line-height: 1.7;
}
.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-nav a {
  font-size: .9rem;
  color: var(--slate-400);
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--blue-400); }
.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  max-width: 380px;
}
.footer-keywords span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: .78rem;
  color: var(--slate-400);
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
  padding: 5px 12px;
  border-radius: 999px;
}
.footer-keywords i { color: var(--blue-400); font-size: .75rem; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 18px 0;
  text-align: center;
}
.footer-bottom p { font-size: .8rem; color: var(--slate-500); }

/* ============================================================
   SCROLL ANIMATION
============================================================ */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   RESPONSIVE
============================================================ */
@media (max-width: 900px) {
  .hero-visual { display: none; }
  .hero-content { max-width: 100%; }
  .steps-grid { flex-direction: column; }
  .step-connector { transform: rotate(90deg); }
}

@media (max-width: 720px) {
  .nav-desktop { display: none; }
  .hamburger { display: flex; }
  .nav-mobile { display: flex; }
  .cta-card { flex-direction: column; align-items: flex-start; }
  .hero-title { font-size: 1.9rem; }
  .category-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-stats { gap: 10px; }
  .stat-card { padding: 12px 16px; min-width: 76px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { justify-content: center; }
  .btn { padding: 12px 22px; font-size: .9rem; }
  .footer-inner { flex-direction: column; gap: 28px; }
}

/* ============================================================
   ARTICLES PAGE（記事一覧タブ）
============================================================ */
.articles-page {
  padding: 3rem 0 5rem;
}

.articles-header {
  margin-bottom: 1.5rem;
}

.articles-filter {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 2rem;
}

/* 記事グリッド */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

/* 記事カード */
.article-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--slate-200);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.article-card-link {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  height: 100%;
  position: relative;
}

/* サムネイル */
.article-card-thumb {
  position: relative;
  height: 130px;
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--thumb-color, #3b82f6) 80%, #000),
    color-mix(in srgb, var(--thumb-color, #3b82f6) 50%, #1e3a8a)
  );
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.article-card-thumb::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 70% 30%, rgba(255,255,255,.18) 0%, transparent 60%);
}
.article-card-thumb-icon {
  font-size: 3.5rem;
  color: rgba(255,255,255,.25);
  position: absolute;
  right: 1rem;
  bottom: -.3rem;
  line-height: 1;
}
.article-card-cat-badge {
  position: relative;
  z-index: 1;
  background: rgba(255,255,255,.2);
  color: #fff;
  border: 1px solid rgba(255,255,255,.35);
  border-radius: 100px;
  padding: .3rem .85rem;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .04em;
  display: flex;
  align-items: center;
  gap: .35rem;
  backdrop-filter: blur(4px);
}

/* ボディ */
.article-card-body {
  padding: 1.2rem 1.3rem 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: .6rem;
}
.article-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--slate-900);
  line-height: 1.5;
}
.article-card:hover .article-card-title {
  color: var(--blue-700);
}
.article-card-excerpt {
  font-size: .86rem;
  color: var(--slate-500);
  line-height: 1.65;
  flex: 1;
}
.article-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem .9rem;
  font-size: .78rem;
  color: var(--slate-400);
}
.article-card-meta span {
  display: flex; align-items: center; gap: .3rem;
}
.article-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem;
}
.article-card-tags .tag {
  background: var(--slate-100);
  color: var(--slate-500);
  border-radius: 100px;
  padding: .18rem .55rem;
  font-size: .73rem;
  font-weight: 500;
}

/* 矢印 */
.article-card-arrow {
  position: absolute;
  bottom: 1.2rem;
  right: 1.3rem;
  width: 2rem;
  height: 2rem;
  background: var(--blue-50);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-500);
  font-size: .8rem;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}
.article-card:hover .article-card-arrow {
  background: var(--blue-600);
  color: #fff;
  transform: translateX(3px);
}

/* Coming Soon カード */
.article-card-coming {
  background: var(--slate-50);
  border: 1.5px dashed var(--slate-300);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .6rem;
  text-align: center;
  opacity: .7;
}
.coming-icon {
  font-size: 2rem;
  color: var(--slate-300);
}
.coming-cat {
  font-size: .75rem;
  font-weight: 700;
  color: var(--slate-400);
  display: flex;
  align-items: center;
  gap: .3rem;
}
.coming-title {
  font-size: .92rem;
  font-weight: 600;
  color: var(--slate-500);
  line-height: 1.45;
}
.coming-badge {
  background: var(--slate-200);
  color: var(--slate-500);
  border-radius: 100px;
  padding: .2rem .7rem;
  font-size: .73rem;
  font-weight: 600;
  letter-spacing: .04em;
}

/* 記事なし */
.articles-empty {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--slate-400);
}
.articles-empty i { font-size: 2.5rem; margin-bottom: .8rem; display: block; }
.articles-empty p { font-size: .95rem; }

@media (max-width: 640px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
}