:root {
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --bg-accent: #eff6ff;
  --bg-accent-strong: #dbeafe;
  --surface: #ffffff;
  --fg: #0f172a;
  --fg-secondary: #334155;
  --sub: #475569;
  --muted: #64748b;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --success: #059669;
  --success-bg: #ecfdf5;
  --warning: #d97706;
  --warning-bg: #fef3c7;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --header-h: 68px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 10px 30px rgba(37, 99, 235, 0.08), 0 4px 12px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 40px rgba(15, 23, 42, 0.08);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: all 0.15s ease;
}

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

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

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--accent);
  color: #ffffff;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
  z-index: 2000;
}

.skip-link:focus {
  top: 12px;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* =========================================
   Sticky Header (Icon-only with tooltip on mobile, never overlaps Hero)
   ========================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  z-index: 1000;
}

.header-inner {
  max-width: 1120px;
  height: 100%;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  font-size: 19px;
  color: var(--fg);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.brand img {
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.18);
}

.brand-badge {
  font-size: 12px;
  font-weight: 700;
  color: var(--success);
  background: var(--success-bg);
  border: 1px solid #a7f3d0;
  padding: 2px 8px;
  border-radius: 999px;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 40px;
  height: 40px;
  padding: 0 10px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--fg-secondary);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}

.icon-btn svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.icon-btn:hover {
  background: var(--bg-soft);
  border-color: var(--line);
  color: var(--accent);
}

/* Tooltip via data-tooltip */
.icon-btn[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  background: #ffffff;
  color: var(--fg);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-md);
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
  padding: 4px 10px;
  border-radius: 8px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.15s ease;
  z-index: 1200;
}

.icon-btn[data-tooltip]:hover::after,
.icon-btn[data-tooltip]:focus-visible::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  background: var(--bg-soft);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  padding: 2px;
  gap: 2px;
}

.lang-btn {
  border: none;
  background: transparent;
  color: var(--sub);
  font-size: 12px;
  font-weight: 800;
  padding: 6px 10px;
  border-radius: 9px;
  cursor: pointer;
  line-height: 1;
}

.lang-btn.active {
  background: var(--accent);
  color: #ffffff;
}

/* Mobile Header Simplification: Icon-only on mobile */
@media (max-width: 820px) {
  .nav-label,
  .brand-badge {
    display: none;
  }
  .icon-btn {
    padding: 0;
    width: 38px;
    height: 38px;
  }
}

/* =========================================
   Main Content & Hero (Guaranteed Top Offset so Hero never hides behind Header)
   ========================================= */
.page-main {
  padding-top: var(--header-h);
}

.hero {
  padding: 44px 0 64px;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px;
  align-items: center;
}

@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.trust-pill {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  font-weight: 800;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--bg-accent);
  color: var(--accent);
  border: 1px solid var(--bg-accent-strong);
}

.trust-pill.green {
  background: var(--success-bg);
  color: var(--success);
  border-color: #a7f3d0;
}

.trust-pill.amber {
  background: var(--warning-bg);
  color: #92400e;
  border-color: #fde68a;
}

.hero-title {
  font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1.25;
  font-weight: 900;
  letter-spacing: -0.025em;
  margin: 0 0 18px;
  color: var(--fg);
}

.hero-title .highlight {
  color: var(--accent);
}

.hero-lead {
  font-size: 16px;
  line-height: 1.75;
  color: var(--sub);
  margin: 0 0 24px;
}

/* Prominent Primary CTA Buttons */
.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 56px;
  padding: 14px 26px;
  border-radius: 16px;
  font-size: 16px;
  font-weight: 800;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.15s ease;
}

.btn-cta-primary {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.25);
}

.btn-cta-primary:hover {
  background: var(--accent-hover);
  color: #ffffff;
  transform: translateY(-1px);
}

.btn-cta-secondary {
  background: #ffffff;
  color: var(--fg);
  border-color: var(--line-strong);
}

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

.hero-reassurance {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
}

/* =========================================
   Interactive Synced Split-Zoom Simulator Card in Hero
   ========================================= */
.hero-visual-card {
  background: #ffffff;
  border: 1.5px solid var(--line-strong);
  border-radius: 24px;
  padding: 20px;
  box-shadow: var(--shadow-lg);
}

.visual-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.visual-card-title {
  font-size: 15px;
  font-weight: 900;
  color: var(--fg);
}

.zoom-preset-group {
  display: inline-flex;
  background: var(--bg-soft);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  padding: 3px;
  gap: 4px;
}

.zoom-btn {
  border: none;
  background: transparent;
  color: var(--sub);
  font-size: 12px;
  font-weight: 800;
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
}

.zoom-btn.active {
  background: var(--accent);
  color: #ffffff;
}

.demo-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 14px;
}

.demo-tab {
  background: var(--bg-soft);
  border: 1.5px solid var(--line);
  border-radius: 12px;
  padding: 8px 10px;
  font-size: 13px;
  font-weight: 800;
  color: var(--sub);
  cursor: pointer;
  text-align: center;
}

.demo-tab.active {
  background: var(--bg-accent);
  border-color: var(--accent);
  color: var(--accent);
}

/* Split-Zoom Dual Panes */
.split-zoom-stage {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 14px;
}

@media (max-width: 520px) {
  .split-zoom-stage {
    grid-template-columns: 1fr;
  }
}

.split-pane {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: var(--bg-soft);
  border: 2.5px solid var(--line);
}

.split-pane.best-pane {
  border-color: var(--warning);
}

.split-pane.trash-pane {
  border-color: var(--danger);
}

.pane-viewport {
  width: 100%;
  height: 210px;
  overflow: hidden;
  position: relative;
  cursor: zoom-in;
}

.pane-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform-origin: 50% 38%;
  transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), filter 0.25s ease;
}

.pane-img.is-blurry {
  filter: blur(2.6px) brightness(0.95);
}

.pane-badge-top {
  position: absolute;
  top: 8px;
  left: 8px;
  right: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
}

.badge-crown {
  background: var(--warning-bg);
  color: #92400e;
  border: 1px solid var(--warning);
  font-size: 12px;
  font-weight: 900;
  padding: 4px 9px;
  border-radius: 8px;
}

.badge-trash {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid #fecaca;
  font-size: 12px;
  font-weight: 900;
  padding: 4px 9px;
  border-radius: 8px;
}

.badge-score {
  background: rgba(255, 255, 255, 0.94);
  color: var(--fg);
  font-size: 12px;
  font-weight: 900;
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.pane-footer {
  background: #ffffff;
  padding: 8px 10px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  font-weight: 700;
  color: var(--sub);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.demo-action-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  background: var(--bg-soft);
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
}

.demo-status-text {
  font-size: 13px;
  font-weight: 700;
  color: var(--fg-secondary);
  margin: 0;
}

.btn-demo-cull {
  background: var(--danger);
  color: #ffffff;
  border: none;
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  white-space: nowrap;
}

.btn-demo-cull.is-done {
  background: var(--success);
}

/* =========================================
   Sections, Cards, Grids
   ========================================= */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-header {
  max-width: 740px;
  margin: 0 auto 44px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  color: var(--accent);
  background: var(--bg-accent);
  border: 1px solid var(--bg-accent-strong);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.3;
  font-weight: 900;
  margin: 0 0 12px;
  color: var(--fg);
}

.section-desc {
  font-size: 16px;
  color: var(--sub);
  margin: 0;
}

.risk-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(245px, 1fr));
  gap: 20px;
}

.risk-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.risk-icon-wrap {
  font-size: 28px;
  margin-bottom: 12px;
}

.risk-card h3 {
  font-size: 18px;
  font-weight: 800;
  margin: 0 0 8px;
}

.risk-card p {
  font-size: 14px;
  color: var(--sub);
  margin: 0;
}

/* App Screens Grid */
.screens-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.screen-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.screen-step-badge {
  align-self: flex-start;
  font-size: 12px;
  font-weight: 800;
  color: var(--accent);
  background: var(--bg-accent);
  padding: 4px 10px;
  border-radius: 8px;
  margin-bottom: 10px;
}

.screen-card h3 {
  font-size: 19px;
  font-weight: 900;
  margin: 0 0 8px;
}

.screen-card p {
  font-size: 14px;
  color: var(--sub);
  margin: 0 0 18px;
}

.phone-frame {
  margin-top: auto;
  border-radius: 18px;
  overflow: hidden;
  border: 2px solid var(--line-strong);
  background: var(--bg-soft);
}

/* =========================================
   Interactive Recommender (回遊性強化 1: シーン別診断)
   ========================================= */
.recommender-box {
  background: #ffffff;
  border: 1.5px solid var(--line-strong);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow-md);
}

.rec-tabs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
  margin-bottom: 24px;
}

.rec-tab-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1.5px solid var(--line);
  background: var(--bg-soft);
  color: var(--fg);
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
}

.rec-tab-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.rec-panel {
  display: none;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
}

.rec-panel.active {
  display: grid;
}

@media (max-width: 820px) {
  .rec-panel.active {
    grid-template-columns: 1fr;
  }
}

.rec-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.rec-pill {
  font-size: 12px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 8px;
  background: var(--bg-accent);
  color: var(--accent);
}

.rec-visual-img {
  border-radius: 18px;
  width: 100%;
  height: 280px;
  object-fit: cover;
  border: 1px solid var(--line);
}

/* =========================================
   Pricing Table
   ========================================= */
.pricing-wrap {
  max-width: 820px;
  margin: 0 auto;
  background: #ffffff;
  border: 1.5px solid var(--line-strong);
  border-radius: 22px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.pricing-table th,
.pricing-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.pricing-table thead th {
  background: var(--bg-soft);
  font-size: 15px;
  font-weight: 900;
}

.pricing-table .pro-col {
  background: var(--bg-accent);
  font-weight: 800;
}

.check-yes {
  color: var(--success);
  font-weight: 800;
}

/* =========================================
   Use Cases & Ecosystem Recommendations (回遊性強化 2 & 3)
   ========================================= */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.usecase-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.usecase-thumb {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.usecase-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.usecase-tag {
  font-size: 12px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 6px;
}

.usecase-body h3 {
  font-size: 17px;
  font-weight: 800;
  margin: 0 0 8px;
}

.usecase-body p {
  font-size: 14px;
  color: var(--sub);
  margin: 0 0 14px;
  flex: 1;
}

.usecase-link {
  font-size: 14px;
  font-weight: 800;
  color: var(--accent);
}

/* FAQ */
.faq-list {
  max-width: 780px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px 22px;
}

.faq-item summary {
  font-size: 16px;
  font-weight: 800;
  cursor: pointer;
  color: var(--fg);
}

.faq-item p {
  font-size: 14px;
  color: var(--sub);
  margin: 12px 0 0;
}

/* Share Bar & Footer (Bright Light Theme) */
.share-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}

.btn-share {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: #ffffff;
  color: var(--fg);
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
}

.btn-share:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.site-footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  padding: 48px 0 36px;
  font-size: 14px;
  color: var(--sub);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-weight: 700;
}

.copy-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #ffffff;
  color: var(--fg);
  border: 2px solid var(--accent);
  box-shadow: var(--shadow-lg);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
  opacity: 0;
  pointer-events: none;
  transition: all 0.2s ease;
  z-index: 2000;
}

.copy-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}