/* pipeline public docs — admin UI と同じ落ち着いた紙テクスチャを維持しつつ
   アクセントは「配管色 (#b7b6eb 平均ペリウィンクル) の濃い目」 #4f47a3 に。
   paprika 本体の 赤と 混同しないように 色相をはっきり 分けてある。 */

:root {
  --bg: #f5f3ef;
  --bg-soft: #ffffff;
  --fg: #222222;
  --fg-soft: #555555;
  --fg-dim: #888888;
  --border: #e2e0e6;
  --border-soft: #ecebf0;
  --accent: #4f47a3;
  --accent-soft: rgba(79, 71, 163, 0.08);
  --accent-strong: #3a3380;
  --code-bg: #f3f2f7;
  --code-fg: #2d2b3a;
  --warn-bg: #fff3e0;
  --warn-fg: #7a4500;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 6px 20px rgba(70, 60, 120, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16151c;
    --bg-soft: #1f1e26;
    --fg: #e8e7ee;
    --fg-soft: #b8b6c8;
    --fg-dim: #8a889c;
    --border: rgba(170, 165, 200, 0.18);
    --border-soft: rgba(170, 165, 200, 0.10);
    --accent: #8a82d6;
    --accent-soft: rgba(138, 130, 214, 0.14);
    --accent-strong: #a8a2e6;
    --code-bg: #25232e;
    --code-fg: #d8d6e6;
    --warn-bg: #2a200c;
    --warn-fg: #f0c95c;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 6px 20px rgba(0, 0, 0, 0.45);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  background: var(--bg);
  color: var(--fg);
  font: 14.5px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI",
        "Hiragino Sans", "Yu Gothic UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* === Header — solid paprika-red, matches admin UI's sticky header === */
header.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}
header .nav {
  max-width: 1080px; margin: 0 auto; padding: 12px 24px;
  display: flex; align-items: center; gap: 22px;
}
header .brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 17px; letter-spacing: -0.005em;
  text-decoration: none; color: #fff;
}
header .brand-icon {
  width: 28px; height: 28px; border-radius: 6px;
  background: #fff; padding: 2px;
  display: block;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}
header .brand-text { color: #fff; }
header .nav-links { display: flex; gap: 4px; margin-left: auto; }
header .nav-links a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none; font-size: 13.5px; font-weight: 500;
  padding: 6px 12px; border-radius: 6px;
  transition: background 0.15s, color 0.15s;
}
header .nav-links a:hover { background: rgba(255, 255, 255, 0.15); color: #fff; }
header .nav-links a.active { background: rgba(255, 255, 255, 0.22); color: #fff; }
header .gh {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.12);
  padding: 5px 12px; border-radius: 6px;
  color: #fff; text-decoration: none; font-size: 13px;
  transition: background 0.15s;
}
header .gh:hover { background: rgba(255, 255, 255, 0.25); }

/* === Hero === */
.hero {
  text-align: center; padding: 64px 24px 56px;
  background:
    radial-gradient(ellipse at top, var(--accent-soft) 0%, transparent 55%),
    linear-gradient(to bottom, var(--bg) 0%, var(--bg-soft) 100%);
}
.hero .hero-icon {
  width: 144px; height: 144px;
  margin: 0 auto 26px;
  display: block;
  border-radius: 22px;
  background: #fff;
  padding: 8px;
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.06),
    0 16px 36px rgba(79, 71, 163, 0.18);
  animation: hero-icon-float 6s ease-in-out infinite;
}
@keyframes hero-icon-float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 14px; letter-spacing: -0.015em; line-height: 1.18;
  color: var(--fg);
}
.hero .tagline {
  font-size: 1.08rem; color: var(--fg-soft);
  margin: 0 auto 28px; max-width: 640px;
}
.hero .cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .hero-demo {
  display: block;
  width: 100%;
  max-width: 780px;
  margin: 44px auto 0;
  border-radius: 12px;
  background: #1c1a24;
  aspect-ratio: 928 / 492;
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.08),
    0 12px 40px rgba(70, 60, 120, 0.18);
  border: 1px solid var(--border-soft);
}
.hero .hero-demo-caption {
  max-width: 780px;
  margin: 12px auto 0;
  font-size: 0.86rem;
  color: var(--fg-dim);
  text-align: center;
}
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 11px 22px; border-radius: 8px;
  font-weight: 600; font-size: 14.5px;
  text-decoration: none;
  transition: transform 0.1s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
}
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 2px 6px rgba(79, 71, 163, 0.25);
}
.btn-primary:hover { background: var(--accent-strong); transform: translateY(-1px); }
.btn-ghost {
  background: var(--bg-soft); color: var(--fg);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* === Section / Container === */
main { max-width: 880px; margin: 0 auto; padding: 40px 24px 80px; }
section { margin-bottom: 56px; }
h1, h2, h3, h4 { letter-spacing: -0.005em; line-height: 1.3; margin-top: 1.6em; margin-bottom: 0.6em; color: var(--fg); }
h1 { font-size: 2.1rem; }
h2 {
  font-size: 1.45rem;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  color: #444;
}
h3 { font-size: 1.15rem; }
h4 { font-size: 1.0rem; color: var(--fg-soft); }
p { color: var(--fg-soft); margin: 0.5em 0 1em; }
a { color: var(--accent-strong); text-decoration: none; }
a:hover { color: var(--accent); text-decoration: underline; }
ul, ol { color: var(--fg-soft); }
li { margin-bottom: 4px; }

/* === Cards / Feature grid === */
.feature-grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin: 28px 0;
}
.feature-card {
  padding: 22px; border-radius: 8px;
  border: 1px solid var(--border-soft);
  background: var(--bg-soft);
  box-shadow: var(--shadow);
  transition: transform 0.15s, box-shadow 0.2s, border-color 0.2s;
}
.feature-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
  box-shadow: var(--shadow-lg);
}
.feature-card .icon {
  width: 38px; height: 38px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent-strong);
  display: grid; place-items: center; margin-bottom: 12px;
  font-size: 19px;
}
.feature-card h3 { margin: 0 0 6px; font-size: 1.02rem; }
.feature-card p { margin: 0; font-size: 13.5px; color: var(--fg-soft); }

/* === Code === */
code {
  background: var(--code-bg); color: var(--code-fg);
  font-family: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas, monospace;
  font-size: 0.9em; padding: 2px 6px; border-radius: 4px;
}
pre {
  background: var(--code-bg); color: var(--code-fg);
  padding: 14px 16px; border-radius: 8px; overflow-x: auto;
  border: 1px solid var(--border);
  font-family: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas, monospace;
  font-size: 13px; line-height: 1.55;
}
pre code { background: transparent; padding: 0; }

/* === Table — matches admin UI table aesthetic === */
table {
  width: 100%; border-collapse: collapse; margin: 14px 0;
  font-size: 13.5px;
  background: var(--bg-soft);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
th, td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--border-soft); vertical-align: middle; }
th { font-weight: 600; color: #555; background: #fafafa; }
@media (prefers-color-scheme: dark) {
  th { background: var(--code-bg); color: var(--fg-soft); }
}
td { color: var(--fg-soft); }
tr:last-child td { border-bottom: none; }
td code { font-size: 12.5px; }

/* === Callout === */
.callout {
  padding: 13px 16px; border-radius: 6px; margin: 16px 0;
  border-left: 3px solid var(--accent); background: var(--accent-soft);
  color: var(--fg);
}
.callout.warn { border-left-color: #d4a017; background: var(--warn-bg); color: var(--warn-fg); }
.callout strong { color: var(--fg); }

/* === TOC === */
.toc {
  background: var(--bg-soft); border: 1px solid var(--border-soft);
  padding: 16px 20px; border-radius: 8px; margin: 20px 0 36px;
  box-shadow: var(--shadow);
}
.toc h4 {
  margin: 0 0 8px; font-size: 0.78rem;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--fg-dim);
}
.toc ul { list-style: none; padding: 0; margin: 0; columns: 2; column-gap: 26px; }
.toc li { margin: 3px 0; break-inside: avoid; }
.toc a { color: var(--fg-soft); font-size: 13.5px; }
.toc a:hover { color: var(--accent-strong); text-decoration: none; }

/* === Footer === */
footer {
  max-width: 1080px; margin: 0 auto; padding: 36px 24px 56px;
  border-top: 1px solid var(--border);
  color: var(--fg-dim); font-size: 12.5px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
footer a { color: var(--fg-soft); }
footer a:hover { color: var(--accent); }

/* === Screenshot tour (= 4 figures grid) === */
.tour-grid {
  display: grid; gap: 18px; margin: 24px 0 8px;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
}
.tour-figure {
  margin: 0; padding: 0;
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: 8px; overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.15s, box-shadow 0.2s, border-color 0.2s;
}
.tour-figure:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  box-shadow: var(--shadow-lg);
}
.tour-figure a { display: block; text-decoration: none; color: inherit; }
.tour-figure img {
  display: block; width: 100%; height: auto;
  border-bottom: 1px solid var(--border-soft);
}
.tour-figure figcaption { padding: 11px 15px 13px; }
.tour-figure figcaption .label {
  font-weight: 600; font-size: 13.5px; color: var(--fg);
  display: flex; align-items: center; gap: 8px;
}
.tour-figure figcaption .label .badge {
  font-size: 10px; padding: 2px 7px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent-strong);
  letter-spacing: 0.04em; text-transform: uppercase; font-weight: 600;
}
.tour-figure figcaption .desc {
  font-size: 12.5px; color: var(--fg-soft); margin-top: 4px; line-height: 1.5;
}

/* === Diagram (SVG container) === */
.diagram {
  margin: 28px 0; padding: 22px; border-radius: 8px;
  background: var(--bg-soft); border: 1px solid var(--border-soft);
  box-shadow: var(--shadow);
  display: flex; justify-content: center;
}
.diagram svg { max-width: 100%; height: auto; }

@media (max-width: 640px) {
  header .nav-links { display: none; }
  .toc ul { columns: 1; }
  .hero { padding: 56px 18px 40px; }
  .hero .hero-icon { width: 120px; height: 120px; }
}