/* ScienceHUB — メインスタイル */

:root {
  --font-sans: "DM Sans", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --color-bg: #f6f8fc;
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-primary: #0d6e6e;
  --color-primary-hover: #0a5555;
  --color-primary-soft: #e6f4f4;
  --color-accent: #2563eb;
  --color-success: #059669;
  --color-warning: #d97706;
  --color-danger: #dc2626;

  --shadow-sm: 0 1px 2px rgb(15 23 42 / 0.05);
  --shadow-md: 0 8px 24px rgb(15 23 42 / 0.08);
  --shadow-lg: 0 20px 50px rgb(15 23 42 / 0.12);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;

  --header-height: 72px;
  --container: min(1120px, calc(100% - 2rem));
}

[data-theme="dark"] {
  --color-bg: #0b1220;
  --color-surface: #111827;
  --color-surface-elevated: #1a2332;
  --color-border: #2a3548;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-primary: #2dd4bf;
  --color-primary-hover: #5eead4;
  --color-primary-soft: rgb(45 212 191 / 0.12);
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.3);
  --shadow-md: 0 8px 24px rgb(0 0 0 / 0.35);
  --shadow-lg: 0 20px 50px rgb(0 0 0 / 0.45);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

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

.container {
  width: var(--container);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 1rem;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
}

.logo strong {
  color: var(--color-primary);
  font-weight: 700;
}

.logo-mark {
  width: 2rem;
  height: 2rem;
  color: var(--color-primary);
}

.nav {
  display: none;
  gap: 1.5rem;
}

.nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-full);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.15s;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-lg {
  padding: 0.8rem 1.35rem;
  font-size: 1rem;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  color: #fff;
}

.btn-outline {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  padding: 0.5rem 0.65rem;
  min-width: 2.5rem;
}

.btn-ghost:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.btn-external {
  font-size: 0.85em;
}

.theme-icon-dark {
  display: none;
}

[data-theme="dark"] .theme-icon-light {
  display: none;
}

[data-theme="dark"] .theme-icon-dark {
  display: inline;
}

/* Hero */

.hero {
  padding: 4rem 0 5rem;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, var(--color-primary-soft), transparent),
    var(--color-bg);
}

.hero-grid {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 1rem;
  padding: 0.35rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: var(--radius-full);
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero-lead {
  margin: 0 0 1.75rem;
  max-width: 36rem;
  font-size: 1.1rem;
  color: var(--color-text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 0;
}

.hero-stats div {
  min-width: 5rem;
}

.hero-stats dt {
  margin: 0;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.hero-stats dd {
  margin: 0.15rem 0 0;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* Hero visual */

.hero-visual {
  position: relative;
  min-height: 320px;
  display: grid;
  place-items: center;
}

.hub-core {
  width: 7rem;
  height: 7rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  box-shadow: var(--shadow-lg);
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.04); }
}

.orbit-card {
  position: absolute;
  padding: 0.85rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 9rem;
}

.orbit-label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.orbit-value {
  display: block;
  margin-top: 0.2rem;
  font-weight: 600;
  font-size: 0.92rem;
}

.orbit-card-1 { top: 8%; left: 5%; }
.orbit-card-2 { top: 12%; right: 0; }
.orbit-card-3 { bottom: 10%; left: 15%; }

/* Sections */

.section {
  padding: 4.5rem 0;
}

.section-header {
  max-width: 38rem;
  margin-bottom: 2.5rem;
}

.section-header h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.02em;
}

.section-header p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

/* Features */

.feature-grid {
  display: grid;
  gap: 1.25rem;
}

.feature-card {
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
}

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

/* Integrations */

.integrations {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

.integration-panel {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.integration-copy h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.4rem, 3vw, 1.85rem);
}

.integration-copy p {
  margin: 0 0 1.25rem;
  color: var(--color-text-muted);
}

.stack-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.stack-list li {
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.stack-list li:last-child {
  border-bottom: none;
}

.stack-list strong {
  color: var(--color-text);
}

.integration-diagram {
  position: relative;
  min-height: 260px;
  display: grid;
  place-items: center;
}

.diagram-node {
  position: absolute;
  padding: 0.65rem 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.diagram-node-center {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  border-color: color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.diagram-node-top { top: 0; }
.diagram-node-left { left: 0; top: 50%; transform: translateY(-50%); }
.diagram-node-right { right: 0; top: 50%; transform: translateY(-50%); }
.diagram-node-bottom { bottom: 0; }

/* Status */

.status-panel {
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

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

.status-grid {
  display: grid;
  gap: 1rem;
}

.status-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  background: var(--color-bg);
  border-radius: var(--radius-md);
}

.status-item-label {
  font-weight: 600;
}

.status-item-detail {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
}

.status-badge::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: currentColor;
}

.status-badge-ok {
  color: var(--color-success);
  background: color-mix(in srgb, var(--color-success) 12%, transparent);
}

.status-badge-error {
  color: var(--color-danger);
  background: color-mix(in srgb, var(--color-danger) 12%, transparent);
}

.status-overall {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* CTA */

.cta {
  padding-bottom: 5rem;
}

.cta-inner {
  text-align: center;
  padding: 3rem 2rem;
  background: linear-gradient(160deg, var(--color-primary-soft), transparent 60%), var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.cta-inner h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.cta-inner > p {
  margin: 0 0 1.5rem;
  color: var(--color-text-muted);
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.cta-note {
  margin: 1.25rem 0 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Footer */

.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.footer-inner p {
  margin: 0;
}

.footer-inner a {
  color: var(--color-text-muted);
  text-decoration: none;
}

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

/* Responsive */

@media (min-width: 640px) {
  .nav {
    display: flex;
  }
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }

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

  .integration-panel {
    grid-template-columns: 1fr 1fr;
  }

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

@media (min-width: 1100px) {
  .feature-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hub-core {
    animation: none;
  }

  .feature-card:hover {
    transform: none;
  }
}