:root {
  --primary-color: #1f3a5f;
  --primary-strong: #13253d;
  --primary-soft: rgba(31, 58, 95, 0.08);
  --accent-color: #2f80ed;
  --bg-color: #f4f7fb;
  --bg-gradient: radial-gradient(circle at top, #ffffff 0%, #eef4fb 45%, #e9f0f7 100%);
  --card-bg: rgba(255, 255, 255, 0.92);
  --card-strong: #ffffff;
  --text-color: #243447;
  --muted-color: #5f6f82;
  --link-color: #1f66d1;
  --border-color: rgba(31, 58, 95, 0.12);
  --border-strong: rgba(31, 58, 95, 0.2);
  --license-bg: #f7faff;
  --shadow-sm: 0 8px 24px rgba(31, 58, 95, 0.08);
  --shadow-md: 0 18px 40px rgba(31, 58, 95, 0.12);
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 24px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.75;
  color: var(--text-color);
  background: var(--bg-gradient);
  margin: 0;
  min-height: 100vh;
  padding: 28px 18px 56px;
}

.container {
  max-width: 1040px;
  margin: 0 auto;
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: var(--shadow-md);
}

h1,
h2,
h3 {
  letter-spacing: 0.01em;
  margin: 0;
}

h1 {
  font-size: clamp(1.8rem, 2vw + 1.2rem, 2.5rem);
  padding-bottom: 14px;
  margin-bottom: 10px;
  color: var(--primary-strong);
  border-bottom: 1px solid var(--border-color);
}

h2 {
  font-size: 1.18rem;
  margin-top: 0;
  margin-bottom: 14px;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

h2::before {
  content: "";
  width: 6px;
  height: 1.15em;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--accent-color), var(--primary-color));
  flex: 0 0 auto;
}

section {
  margin-top: 20px;
  padding: 22px 24px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

p {
  margin: 0.75em 0;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

li {
  padding: 14px 0;
  border-bottom: 1px solid var(--border-color);
}

li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

strong {
  color: var(--primary-strong);
}

.source-name {
  font-weight: 700;
  display: block;
  color: var(--primary-strong);
}

.source-url {
  font-size: 0.9rem;
  color: var(--link-color);
  text-decoration: none;
  word-break: break-all;
}

.small {
  font-size: 0.9rem;
  color: var(--muted-color);
}

.license-box,
.notice-box,
.disclaimer {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.license-box {
  margin-top: 12px;
  padding: 16px;
  background: var(--license-bg);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.8rem;
  white-space: pre-wrap;
  max-height: 320px;
  overflow: auto;
}

.notice-box {
  margin-top: 12px;
  padding: 14px 16px;
  background: linear-gradient(180deg, rgba(47, 128, 237, 0.08), rgba(47, 128, 237, 0.03));
  font-size: 0.95rem;
}

.disclaimer {
  margin-top: 28px;
  padding: 18px 20px;
  background: linear-gradient(180deg, rgba(31, 58, 95, 0.08), rgba(31, 58, 95, 0.03));
  font-size: 0.93rem;
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

a {
  color: var(--link-color);
  text-decoration: none;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration: underline;
}

footer {
  margin-top: 28px;
  padding-top: 18px;
  text-align: center;
  font-size: 0.83rem;
  color: var(--muted-color);
  border-top: 1px solid var(--border-color);
}

hr {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: 24px 0;
}

@media (max-width: 720px) {
  body {
    padding: 16px 12px 40px;
  }

  .container {
    padding: 20px 16px;
    border-radius: 18px;
  }

  section {
    padding: 18px 16px;
  }
}