:root {
  --bg-color: #f4f6fb;
  --card-bg: #ffffff;
  --accent: #4285f4;
  --accent-dark: #1a73e8;
  --accent-rgb: 66, 133, 244;
  --text-main: #202124;
  --text-muted: #5f6368;
  --border-radius: 16px;
  --shadow-sm: 0 10px 30px rgba(var(--accent-rgb), 0.08);
  --transition: 0.35s ease;
}

body.theme-gcp {
  --bg-color: #f1f3f4;
  --accent: #4285f4;
  --accent-dark: #1a73e8;
  --accent-rgb: 66, 133, 244;
  --shadow-sm: 0 10px 30px rgba(var(--accent-rgb), 0.08);
}

body.theme-home {
  --bg-color: #ffffff;
  --accent: #6366f1;
  --accent-dark: #4f46e5;
  --accent-rgb: 99, 102, 241;
  --shadow-sm: 0 18px 46px rgba(var(--accent-rgb), 0.14);
}

body.theme-azure {
  --bg-color: #f3f7fc;
  --accent: #0078d4;
  --accent-dark: #005a9e;
  --accent-rgb: 0, 120, 212;
  --shadow-sm: 0 10px 30px rgba(var(--accent-rgb), 0.08);
}

body.theme-aws {
  --bg-color: #fdf6ec;
  --accent: #ff9900;
  --accent-dark: #cc7a00;
  --accent-rgb: 255, 153, 0;
  --shadow-sm: 0 10px 30px rgba(var(--accent-rgb), 0.08);
}

body.theme-compare {
  --bg-color: #ffffff;
  --accent: #0ea5e9;
  --accent-dark: #0284c7;
  --accent-rgb: 14, 165, 233;
  --shadow-sm: 0 16px 44px rgba(var(--accent-rgb), 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: 'Noto Sans JP', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
    sans-serif;
  background: var(--bg-color);
  color: var(--text-main);
  line-height: 1.7;
}

.page-header {
  padding: 40px 24px 24px;
  text-align: center;
  background: radial-gradient(circle at top, rgba(var(--accent-rgb), 0.15), transparent 65%),
    var(--bg-color);
}

.headline {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.headline__link {
  color: inherit;
  text-decoration: none;
}

.headline__link:visited {
  color: inherit;
}

.headline__link:hover,
.headline__link:focus-visible {
  text-decoration: none;
}

.tagline {
  margin: 16px auto 0;
  max-width: 720px;
  color: var(--text-muted);
  font-size: 1rem;
}

.page-nav {
  margin: 28px auto 0;
}

.nav-list {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 0;
  margin: 0;
  list-style: none;
  justify-content: center;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.1);
  color: var(--accent-dark);
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), transform 0.2s ease,
    box-shadow var(--transition);
}

.nav-link:hover,
.nav-link:focus {
  background: rgba(var(--accent-rgb), 0.18);
  color: var(--accent-dark);
  transform: translateY(-1px);
  outline: none;
}

.nav-link:focus-visible {
  outline: 3px solid rgba(var(--accent-rgb), 0.4);
  outline-offset: 3px;
}

.nav-link[aria-current='page'] {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 12px 30px rgba(var(--accent-rgb), 0.22);
}

.page-main {
  flex: 1;
  width: min(1100px, 92vw);
  margin: 0 auto 48px;
}

.comparison-main {
  padding: 48px 0 80px;
  display: flex;
  flex-direction: column;
  gap: 64px;
}

.comparison-summary {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 32px;
  border-radius: 24px;
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(var(--accent-rgb), 0.12);
}

.comparison-summary .section-intro {
  margin: 0;
}

.comparison-points {
  margin: 0;
  padding-left: 1.2em;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.comparison-table-section .section-intro {
  margin-bottom: 16px;
}

.comparison-table-section .table-wrapper {
  margin-top: 16px;
  border-radius: 24px;
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(var(--accent-rgb), 0.12);
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

.comparison-table caption {
  padding: 24px 28px 18px;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--accent-dark);
  text-align: left;
}

.comparison-table th,
.comparison-table td {
  padding: 18px 28px;
  font-size: 0.95rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(var(--accent-rgb), 0.12);
}

.comparison-table thead th {
  position: sticky;
  top: 0;
  z-index: 3;
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--accent-dark);
  font-weight: 700;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 0 rgba(var(--accent-rgb), 0.14);
}

.comparison-table thead th:first-child {
  left: 0;
  z-index: 5;
  box-shadow: 2px 0 0 rgba(var(--accent-rgb), 0.14), 0 2px 0 rgba(var(--accent-rgb), 0.14);
}

.comparison-table tbody tr:nth-child(even) {
  background: rgba(var(--accent-rgb), 0.04);
}

.comparison-table tbody tr:nth-child(even) .category-cell {
  background: rgba(var(--accent-rgb), 0.04);
}

.comparison-table tbody tr:last-child th,
.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

.comparison-table .category-cell {
  width: 18%;
  font-weight: 700;
  color: var(--accent-dark);
  position: sticky;
  left: 0;
  z-index: 2;
  background: var(--card-bg);
  box-shadow: 2px 0 0 rgba(var(--accent-rgb), 0.12);
}

.comparison-table .service-cell {
  width: 17%;
  font-weight: 600;
}

.comparison-table .service-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.comparison-table .service-list li {
  display: flex;
  align-items: flex-start;
}

.comparison-table .service-cell a {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 12px;
  background: rgba(var(--accent-rgb), 0.08);
  border: 1px solid rgba(var(--accent-rgb), 0.18);
  color: var(--accent-dark);
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition),
    color var(--transition), transform 0.2s ease, box-shadow var(--transition);
  box-shadow: none;
}

.comparison-table .service-cell a::after {
  content: '\2197';
  font-size: 0.8em;
  opacity: 0.65;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.comparison-table .service-cell a:hover,
.comparison-table .service-cell a:focus {
  background: rgba(var(--accent-rgb), 0.14);
  border-color: rgba(var(--accent-rgb), 0.3);
  color: var(--accent-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(var(--accent-rgb), 0.18);
}

.comparison-table .service-cell a:hover::after,
.comparison-table .service-cell a:focus::after {
  opacity: 1;
  transform: translate(2px, -1px);
}

.comparison-table .service-cell a:focus-visible {
  outline: 3px solid rgba(var(--accent-rgb), 0.35);
  outline-offset: 3px;
}

.comparison-table .note-cell {
  width: 31%;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.comparison-next {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.comparison-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.comparison-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--accent-dark);
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition), transform 0.2s ease;
}

.comparison-link:hover,
.comparison-link:focus {
  background: rgba(var(--accent-rgb), 0.22);
  transform: translateY(-1px);
  outline: none;
}

.comparison-link:focus-visible {
  outline: 3px solid rgba(var(--accent-rgb), 0.4);
  outline-offset: 3px;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 0 24px;
}

.view-title {
  margin: 0;
  font-size: clamp(1.4rem, 2vw, 1.8rem);
  font-weight: 600;
}

.back-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border: none;
  border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--accent);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform 0.2s ease;
}

.back-button:hover,
.back-button:focus {
  background: rgba(var(--accent-rgb), 0.22);
  outline: none;
  transform: translateY(-1px);
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.tile-grid.grouped {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.info-message {
  grid-column: 1 / -1;
  margin: 0;
  padding: 32px;
  border-radius: var(--border-radius);
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  color: var(--text-muted);
  text-align: center;
}

.tile {
  position: relative;
  padding: 24px;
  border-radius: var(--border-radius);
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.category-tile {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  border: none;
  background: var(--card-bg);
  color: inherit;
  font: inherit;
  text-align: left;
  appearance: none;
}

.category-tile:focus-visible {
  outline: 3px solid rgba(var(--accent-rgb), 0.35);
  outline-offset: 4px;
}

.tile:hover,
.tile:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 14px 40px rgba(var(--accent-rgb), 0.18);
}

.tile-title {
  margin: 0 0 12px;
  font-size: 1.2rem;
  font-weight: 600;
}

.tile-description {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.category-badge {
  display: inline-block;
  padding: 4px 10px;
  margin-bottom: 14px;
  border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.08);
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.service-tile {
  padding: 0;
  height: 260px;
  perspective: 1200px;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), height 0.45s ease;
}

.service-tile.flipped {
  height: clamp(320px, 40vw, 420px);
  z-index: 2;
}

@media (min-width: 900px) {
  .service-tile.flipped {
    grid-column: span 2;
  }
}

.service-tile .tile-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s ease;
  transform-style: preserve-3d;
  border-radius: var(--border-radius);
}

.service-tile.flipped .tile-inner {
  transform: rotateY(180deg);
}

.tile-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 24px;
  backface-visibility: hidden;
  border-radius: var(--border-radius);
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.tile-front {
  align-items: flex-start;
}

.tile-front .tile-title {
  font-size: 1.1rem;
}

.tile-front .pill {
  display: inline-block;
  padding: 6px 12px;
  margin-top: 14px;
  border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
}


.tile-back {
  transform: rotateY(180deg);
  justify-content: flex-start;
  gap: 12px;
  overflow: hidden;
}

.tile-back-body {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
  overflow-x: hidden;
  padding-right: 6px;
  scrollbar-gutter: stable;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.tile-back p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.tile-back ul {
  margin: 12px 0 16px 1.2em;
  padding: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.tile-back a {
  margin-top: auto;
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s ease;
}

.tile-back a:hover,
.tile-back a:focus {
  background: var(--accent-dark);
}

.service-group {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.service-group-header {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.service-group-title {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--accent-dark);
}

.service-group-description {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.service-group-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.page-footer {
  padding: 24px 16px 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.home-header {
  padding: clamp(72px, 20vw, 96px) 24px 64px;
  text-align: center;
  background: radial-gradient(circle at top, rgba(var(--accent-rgb), 0.18), transparent 65%),
    linear-gradient(160deg, rgba(var(--accent-rgb), 0.16), transparent 55%), var(--bg-color);
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  margin: 0 auto 20px;
  border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--accent-dark);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-title {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 3.1rem);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.hero-title__link {
  color: inherit;
  text-decoration: none;
}

.hero-title__link:visited {
  color: inherit;
}

.hero-title__link:hover,
.hero-title__link:focus-visible {
  text-decoration: none;
}

.hero-lead {
  margin: 20px auto 0;
  max-width: 760px;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.hero-steps {
  margin: clamp(36px, 7vw, 56px) auto 0;
  padding: clamp(28px, 6vw, 40px);
  max-width: min(920px, 100%);
  border-radius: 28px;
  background: linear-gradient(
      135deg,
      rgba(var(--accent-rgb), 0.16),
      rgba(var(--accent-rgb), 0.08)
    ),
    rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(var(--accent-rgb), 0.22);
  box-shadow: 0 26px 52px rgba(var(--accent-rgb), 0.18);
  display: flex;
  flex-direction: column;
  gap: 28px;
  text-align: left;
  backdrop-filter: blur(6px);
}

.hero-steps__title {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 2.3rem);
  font-weight: 700;
  letter-spacing: 0.03em;
}

.hero-steps__intro {
  margin: 0;
  max-width: 720px;
  color: var(--text-muted);
  font-size: 1rem;
}

.hero-steps .steps-list {
  gap: clamp(20px, 5vw, 28px);
}

.hero-actions {
  margin: 36px auto 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 999px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 18px 32px rgba(var(--accent-rgb), 0.25);
  transition: background var(--transition), transform 0.2s ease, box-shadow var(--transition);
}

.hero-button:hover,
.hero-button:focus {
  background: var(--accent-dark);
  transform: translateY(-2px);
}

.hero-button:focus-visible {
  outline: 3px solid rgba(var(--accent-rgb), 0.4);
  outline-offset: 4px;
}

.hero-button--secondary {
  background: transparent;
  color: var(--accent-dark);
  border: 2px solid rgba(var(--accent-rgb), 0.35);
  box-shadow: none;
}

.hero-button--secondary:hover,
.hero-button--secondary:focus {
  background: rgba(var(--accent-rgb), 0.12);
}

.hero-metrics {
  margin: 48px auto 0;
  max-width: 760px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  padding: 0;
}

.hero-metric {
  padding: 20px 24px;
  border-radius: 18px;
  background: rgba(var(--accent-rgb), 0.1);
  border: 1px solid rgba(var(--accent-rgb), 0.18);
  backdrop-filter: blur(2px);
}

.hero-metric dt {
  margin: 0 0 6px;
  color: var(--accent-dark);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-metric dd {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
}

.home-main {
  width: min(1100px, 92vw);
  margin: 0 auto;
  padding: 48px 0 72px;
  display: flex;
  flex-direction: column;
  gap: 72px;
}

.ad-section {
  width: min(1100px, 92vw);
  margin: 0 auto 64px;
  padding: 8px 0 16px;
  display: flex;
  justify-content: center;
}

.home-section {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.section-title {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.2rem);
  font-weight: 700;
}

.section-intro {
  margin: 0;
  max-width: 720px;
  color: var(--text-muted);
  font-size: 1rem;
}

.provider-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.provider-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 28px;
  border-radius: 20px;
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(var(--accent-rgb), 0.12);
  border-top: 5px solid transparent;
}

.provider-card--gcp {
  border-top-color: #4285f4;
}

.provider-card--azure {
  border-top-color: #0078d4;
}

.provider-card--aws {
  border-top-color: #ff9900;
}

.provider-card__title {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 700;
}

.provider-card__description {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.98rem;
}

.provider-card__list {
  margin: 0;
  padding-left: 1.1em;
  color: var(--text-muted);
  font-size: 0.92rem;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.provider-card__link {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.16);
  color: var(--accent-dark);
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition), transform 0.2s ease;
}

.provider-card__link:hover,
.provider-card__link:focus {
  background: rgba(var(--accent-rgb), 0.24);
  transform: translateY(-1px);
}

.provider-card__link:focus-visible {
  outline: 3px solid rgba(var(--accent-rgb), 0.4);
  outline-offset: 4px;
}

.steps-list {
  counter-reset: steps;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.steps-list li {
  position: relative;
  padding: 28px 24px 24px;
  border-radius: 18px;
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(var(--accent-rgb), 0.12);
}

.steps-list li::before {
  counter-increment: steps;
  content: counter(steps, decimal-leading-zero);
  position: absolute;
  top: -18px;
  left: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 12px 24px rgba(var(--accent-rgb), 0.25);
}

.steps-list h3 {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.steps-list p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.updates-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.updates-list li {
  padding: 20px 24px;
  border-radius: 16px;
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(var(--accent-rgb), 0.1);
  display: grid;
  gap: 6px;
}

.updates-list time {
  font-weight: 600;
  color: var(--accent-dark);
  letter-spacing: 0.04em;
}

.home-footer {
  max-width: 760px;
  margin: 0 auto;
  line-height: 1.6;
}

@media (max-width: 900px) {
  .comparison-main {
    padding: 40px 0 64px;
    gap: 52px;
  }

  .comparison-summary {
    padding: 28px;
    border-radius: 20px;
  }

  .comparison-table-section .table-wrapper {
    border-radius: 20px;
  }

  .comparison-table caption {
    padding: 20px 24px 16px;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 16px 24px;
    font-size: 0.9rem;
  }
}

@media (max-width: 720px) {
  .hero-metrics {
    margin-top: 36px;
  }

  .hero-steps {
    padding: 28px 24px;
    border-radius: 24px;
    gap: 24px;
  }

  .hero-steps .steps-list {
    grid-template-columns: 1fr;
  }

  .hero-button {
    width: 100%;
  }

  .hero-button--secondary {
    border-width: 1px;
  }
}

@media (max-width: 600px) {
  .service-tile {
    height: 300px;
  }

  .comparison-summary {
    padding: 24px;
  }

  .comparison-table caption {
    padding: 18px 20px 14px;
  }

  .comparison-table {
    min-width: 560px;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 14px 18px;
  }

  .comparison-links {
    flex-direction: column;
  }

  .comparison-link {
    width: 100%;
    justify-content: center;
  }
}