/* Celebi website — clean scientific-project style, inspired by reana.io */

:root {
  --brand: #4aa8e4;
  --brand-dark: #1f7ab8;
  --brand-soft: #e3f2fc;
  --ink: #16202a;
  --ink-soft: #4c5a68;
  --bg: #ffffff;
  --bg-alt: #f4f9fd;
  --bg-card: #ffffff;
  --line: #dfe9f2;
  --terminal-bg: #0e1720;
  --terminal-ink: #d3e2ee;
  --code-bg: #0e1720;
  --code-ink: #d9e6f2;
  --accent-cmd: #9fd7ff;
  --accent-ok: #57d98d;
  --accent-out: #8fa9bd;
  --radius: 12px;
  --shadow: 0 2px 10px rgba(30, 80, 120, 0.08);
  --maxw: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --brand: #6ec0f5;
    --brand-dark: #8fd0f8;
    --brand-soft: #12283a;
    --ink: #e4edf4;
    --ink-soft: #9fb2c1;
    --bg: #0c1218;
    --bg-alt: #101922;
    --bg-card: #131e29;
    --line: #1f2e3d;
    --terminal-bg: #080e14;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

code, pre, .terminal { font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; }

a { color: var(--brand-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 780px; }
.center { text-align: center; }
.muted { color: var(--ink-soft); }

.skip-link {
  position: absolute; left: -9999px; top: 0; padding: 8px 16px;
  background: var(--brand); color: #fff; z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 20px; height: 62px; }
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1.15rem; color: var(--ink);
}
.brand:hover { text-decoration: none; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 18px; font-size: 0.95rem; }
.site-nav a { color: var(--ink-soft); }
.site-nav a:hover { color: var(--brand-dark); text-decoration: none; }
.nav-sep { width: 1px; height: 20px; background: var(--line); }
.nav-github { display: inline-flex; color: var(--ink-soft); }
.lang-switch {
  border: 1px solid var(--line); border-radius: 999px; padding: 3px 12px;
  font-size: 0.85rem;
}
.nav-toggle {
  display: none; margin-left: auto; background: none; border: 0; cursor: pointer;
  width: 40px; height: 40px; padding: 8px;
}
.nav-toggle span { display: block; height: 2px; margin: 5px 0; background: var(--ink); border-radius: 2px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 88px 0 110px;
  text-align: center;
  background:
    radial-gradient(60% 80% at 50% -10%, var(--brand-soft), transparent 70%),
    var(--bg);
  overflow: hidden;
}
.hero-brand { display: flex; align-items: center; justify-content: center; gap: 18px; margin-bottom: 14px; }
.hero-logo { display: inline-block; height: 4.2rem; width: auto; }
.hero-wordmark {
  font-size: 3.4rem; font-weight: 800; letter-spacing: 0.01em; line-height: 1;
  color: var(--ink);
}
@media (max-width: 720px) {
  .hero-logo { height: 2.2rem; }
  .hero-wordmark { font-size: 3rem; }
}
.hero-badge {
  display: inline-block; margin: 0 0 14px; padding: 4px 14px;
  border: 1px solid var(--line); border-radius: 999px;
  color: var(--ink-soft); font-size: 0.82rem; letter-spacing: 0.02em;
  background: var(--bg-card);
}
.hero h1 {
  margin: 0 auto 18px; max-width: 800px;
  font-size: clamp(1.9rem, 4.5vw, 3rem); line-height: 1.2; letter-spacing: -0.02em;
}
.hero-sub { max-width: 680px; margin: 0 auto 30px; color: var(--ink-soft); font-size: 1.06rem; }
.hero-cta { display: flex; gap: 14px; justify-content: center; margin-bottom: 34px; flex-wrap: wrap; }
.hero-install {
  display: inline-block; margin: 0 auto; padding: 14px 22px;
  background: var(--code-bg); color: var(--code-ink);
  border-radius: 10px; font-size: 0.9rem; text-align: left;
  box-shadow: var(--shadow); overflow-x: auto; max-width: 100%;
}
.hero .wave { position: absolute; bottom: -1px; left: 0; width: 100%; height: 72px; fill: var(--bg-alt); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; padding: 11px 26px; border-radius: 10px;
  font-weight: 600; font-size: 0.98rem; transition: transform .12s ease, box-shadow .12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 4px 14px rgba(74, 168, 228, 0.4); }
.btn-primary:hover { background: var(--brand-dark); color: #fff; }
.btn-ghost { border: 1px solid var(--line); color: var(--ink); background: var(--bg-card); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand-dark); }

/* ---------- Sections ---------- */
.section { padding: 84px 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
  margin: 0 0 10px; text-align: center;
  font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -0.01em;
}
.section-sub { text-align: center; color: var(--ink-soft); margin: 0 0 44px; }
.page-head { padding-top: 64px; }

/* ---------- Features ---------- */
.feature-grid {
  display: grid; gap: 18px; margin-top: 44px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.feature-card {
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; box-shadow: var(--shadow);
  transition: transform .15s ease, border-color .15s ease;
}
.feature-card:hover { transform: translateY(-3px); border-color: var(--brand); }
.feature-icon {
  width: 48px; height: 48px; border-radius: 12px; margin-bottom: 14px;
  display: flex; align-items: center; justify-content: center;
  background: var(--brand-soft); color: var(--brand-dark);
}
.feature-card h3 { margin: 0 0 8px; font-size: 1.08rem; }
.feature-card p { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }

/* ---------- Terminal ---------- */
.terminal {
  margin-top: 40px; border-radius: 14px; overflow: hidden;
  background: var(--terminal-bg); color: var(--terminal-ink);
  box-shadow: 0 12px 34px rgba(15, 45, 75, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.06);
}
.terminal-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 14px; background: rgba(255, 255, 255, 0.045);
}
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.red { background: #ff5f57; } .dot.yellow { background: #febc2e; } .dot.green { background: #28c840; }
.terminal-title { margin-left: 10px; font-size: 0.8rem; color: var(--accent-out); }
.terminal-body { padding: 20px 22px; font-size: 0.9rem; line-height: 1.9; overflow-x: auto; }
.tline { white-space: pre; }
.t-cmd { color: var(--accent-cmd); }
.t-cmd .prompt { color: var(--brand); font-weight: 700; }
.t-ok { color: var(--accent-ok); }
.t-out { color: var(--accent-out); }

/* ---------- Concepts ---------- */
.concept-grid {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}
.concept-card {
  border: 1px solid var(--line); border-left: 4px solid var(--brand);
  border-radius: 10px; padding: 18px 20px; background: var(--bg-card);
}
a.concept-card {
  display: block; color: var(--ink);
  transition: transform .15s ease, border-color .15s ease;
}
a.concept-card:hover { text-decoration: none; transform: translateY(-3px); border-color: var(--brand); }
.concept-card h3 { margin: 0 0 6px; font-size: 1rem; color: var(--brand-dark); }
.concept-card p { margin: 0; font-size: 0.92rem; color: var(--ink-soft); }

/* ---------- Ecosystem ---------- */
.eco-grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.eco-card {
  position: relative; display: block;
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow); color: var(--ink);
  transition: transform .15s ease, border-color .15s ease;
}
.eco-card:hover { transform: translateY(-3px); border-color: var(--brand); text-decoration: none; }
.eco-kind {
  margin: 0 0 8px; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--brand-dark); font-weight: 700;
}
.eco-card h3 { margin: 0 0 8px; font-size: 1.15rem; color: var(--ink); }
.eco-card p { margin: 0; color: var(--ink-soft); font-size: 0.95rem; padding-right: 26px; }
.eco-arrow {
  position: absolute; right: 20px; top: 22px; color: var(--brand);
  transition: transform .15s ease;
}
.eco-card:hover .eco-arrow { transform: translateX(4px); }

/* ---------- Steps ---------- */
.steps { max-width: 780px; margin: 0 auto; display: grid; gap: 30px; }
.step { display: flex; gap: 20px; align-items: flex-start; }
.step-num {
  flex: none; width: 44px; height: 44px; border-radius: 50%;
  background: var(--brand); color: #fff; font-weight: 700; font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(74, 168, 228, 0.4);
}
.step-body { flex: 1; min-width: 0; }
.step-body h3 { margin: 6px 0 6px; }
.step-body > p { margin: 0 0 12px; color: var(--ink-soft); }
pre.code {
  margin: 0; padding: 14px 18px; border-radius: 10px;
  background: var(--code-bg); color: var(--code-ink);
  font-size: 0.88rem; line-height: 1.7; overflow-x: auto;
}

/* ---------- News ---------- */
.news-list { list-style: none; margin: 34px 0 30px; padding: 0; display: grid; gap: 4px; }
.news-list li {
  padding: 16px 4px; border-bottom: 1px solid var(--line);
  display: grid; grid-template-columns: 110px 1fr; gap: 6px 18px; align-items: baseline;
}
.news-list time { color: var(--ink-soft); font-size: 0.88rem; font-variant-numeric: tabular-nums; }
.news-list a { font-weight: 600; color: var(--ink); }
.news-list a:hover { color: var(--brand-dark); }
.news-list p { grid-column: 2; margin: 0; color: var(--ink-soft); font-size: 0.92rem; }
.news-list li.nodate { grid-template-columns: 1fr; }
.news-list li.nodate p { grid-column: 1; }

/* ---------- Roadmap ---------- */
.roadmap-grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.roadmap-col {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow);
}
.roadmap-col h3 {
  margin: 0 0 14px; padding-bottom: 10px; font-size: 1.05rem;
  border-bottom: 2px solid var(--line);
}
.roadmap-current h3 { border-color: var(--brand); color: var(--brand-dark); }
.roadmap-near h3 { border-color: #d9a514; }
.roadmap-future h3 { border-color: var(--ink-soft); }
.roadmap-col ul { margin: 0; padding-left: 20px; color: var(--ink-soft); font-size: 0.94rem; }
.roadmap-col li { margin-bottom: 8px; }

/* ---------- Prose (news articles) ---------- */
.prose h1 { font-size: 1.9rem; margin: 6px 0 4px; }
.prose h2 { margin-top: 1.8em; }
.prose p, .prose li { font-size: 1rem; }
.prose pre {
  padding: 14px 18px; border-radius: 10px; overflow-x: auto;
  background: var(--code-bg); color: var(--code-ink); font-size: 0.88rem;
}
.prose code { background: var(--brand-soft); padding: 2px 6px; border-radius: 6px; font-size: 0.9em; }
.prose pre code { background: none; padding: 0; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-alt); margin-top: 40px; }
.footer-grid {
  display: grid; gap: 30px; padding-top: 54px; padding-bottom: 30px;
  grid-template-columns: 2fr 1fr 1fr 1fr;
}
.footer-brand p { color: var(--ink-soft); font-size: 0.92rem; margin: 12px 0 0; max-width: 300px; }
.footer-brand .license a { font-size: 0.85rem; }
.footer-col { display: grid; gap: 9px; align-content: start; }
.footer-col h3 { margin: 0 0 6px; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-soft); }
.footer-col a { color: var(--ink-soft); font-size: 0.94rem; }
.footer-col a:hover { color: var(--brand-dark); }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  padding-top: 20px; padding-bottom: 26px; border-top: 1px solid var(--line);
  font-size: 0.85rem; color: var(--ink-soft);
}
.footer-bottom p { margin: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none; position: absolute; top: 62px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    padding: 8px 24px 16px; box-shadow: var(--shadow);
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 10px 0; }
  .nav-sep, .nav-github { display: none; }
  .lang-switch { align-self: flex-start; margin-top: 8px; }
  .news-list li { grid-template-columns: 1fr; }
  .news-list p { grid-column: 1; }
  .section { padding: 60px 0; }
  .hero { padding: 60px 0 84px; }
}