:root {
  color-scheme: dark;
  --bg: #0d1422;
  --bg-soft: #111b2c;
  --panel: #162235;
  --panel-2: #1c2a3f;
  --text: #edf7fb;
  --muted: #c8d5e1;
  --soft: #d9e9f0;
  --line: rgba(255,255,255,.18);
  --teal: #4bd8cf;
  --teal-soft: rgba(75,216,207,.16);
  --gold: #f6c14d;
  --blue: #6777ff;
  --shadow: 0 20px 70px rgba(0,0,0,.35);
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 20% 0%, rgba(75,216,207,.14), transparent 32rem),
    radial-gradient(circle at 85% 8%, rgba(103,119,255,.16), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}

a { color: var(--teal); text-decoration-thickness: .08em; text-underline-offset: .18em; }
.skip-link { position: absolute; left: -999px; top: 1rem; }
.skip-link:focus { left: 1rem; z-index: 20; background: var(--gold); color: #111; padding: .6rem .8rem; border-radius: 8px; }
.container { width: min(1180px, calc(100% - 2rem)); margin: 0 auto; }
.narrow { width: min(900px, calc(100% - 2rem)); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(13,20,34,.82);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 76px; }
.brand { display: inline-flex; align-items: center; gap: .8rem; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 12px; background: linear-gradient(135deg, var(--teal), var(--blue)); color: #07111f; font-weight: 800; }
.brand span:last-child { display: grid; line-height: 1.15; }
.brand em { color: var(--muted); font-style: normal; font-size: .88rem; }
.top-nav { display: flex; align-items: center; justify-content: flex-end; gap: .35rem; flex-wrap: wrap; }
.top-nav a { text-decoration: none; color: var(--soft); padding: .48rem .7rem; border-radius: 999px; font-size: .92rem; }
.top-nav a:hover, .top-nav a.active { color: var(--text); background: rgba(255,255,255,.08); }

.home-hero, .page-hero { padding: 5.5rem 0 4rem; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(280px, .8fr); gap: 2rem; align-items: center; }
.eyebrow { margin: 0 0 .7rem; color: var(--teal); text-transform: uppercase; letter-spacing: .12em; font-size: .78rem; font-weight: 800; }
h1, h2, h3 { line-height: 1.12; margin: 0 0 1rem; color: #ffffff; }
h1 { font-size: clamp(2.35rem, 6vw, 5rem); letter-spacing: -.03em; }
h2 { font-size: clamp(1.7rem, 3vw, 2.55rem); }
h3 { font-size: 1.35rem; color: #f4fbff; }
.hero-lede { font-size: clamp(1.1rem, 2vw, 1.32rem); color: var(--muted); max-width: 68ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.6rem; }
.button { text-decoration: none; padding: .82rem 1.1rem; border-radius: 999px; border: 1px solid var(--line); font-weight: 700; }
.button.primary { background: var(--teal); color: #07111f; border-color: transparent; }
.button.secondary { background: rgba(255,255,255,.06); color: var(--text); }
.hero-panel, .content-card, .summary-box, .progress-card, .research-article > section, .progression-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.035));
  box-shadow: var(--shadow);
}
.hero-panel { padding: 1.4rem; }
.hero-panel span { color: var(--gold); font-weight: 800; }
.hero-panel ul { margin: 1rem 0 0; padding: 0; list-style: none; display: grid; gap: .7rem; }
.hero-panel li { padding: .8rem; border-radius: 10px; background: rgba(255,255,255,.06); }

.intro-grid, .overview-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; padding: 2rem 0 4rem; }
.content-card, .status-card { padding: 1.35rem; }
.content-card p, .section-heading p, .research-article p, .research-article li { color: var(--soft); }
.feature-card h2 { font-size: clamp(1.35rem, 2vw, 1.9rem); }
.text-link { display: inline-flex; margin-top: .4rem; font-weight: 800; }
.reader-guide-section { padding: 0 0 2rem; }
.progression-section { padding: 2rem 0 5rem; }
.section-heading { max-width: 760px; margin-bottom: 1.6rem; }
.progression-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.progression-card { display: block; text-decoration: none; padding: 1.15rem; min-height: 210px; transition: transform .18s ease, border-color .18s ease; }
.progression-card:hover { transform: translateY(-3px); border-color: rgba(75,216,207,.45); }
.progression-card span { color: var(--gold); font-weight: 800; }
.progression-card strong { display: block; margin: .45rem 0; font-size: 1.05rem; }
.progression-card p { margin: 0; color: var(--soft); font-size: .95rem; }

.compact-hero { padding-bottom: 2.5rem; }
.summary-box { padding: 1.2rem; margin-top: 1.4rem; background: var(--teal-soft); box-shadow: none; }
.summary-box strong { color: var(--teal); }
.summary-box p { margin: .35rem 0 0; color: #eefaff; }
.article-layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 1.2rem; align-items: start; padding-bottom: 5rem; }
.progress-card { position: sticky; top: 96px; padding: 1rem; box-shadow: none; }
.progress-card span { color: var(--muted); font-size: .82rem; text-transform: uppercase; letter-spacing: .1em; }
.progress-card strong { display: block; font-size: 2rem; color: var(--gold); }
.research-article { min-width: 0; overflow-wrap: anywhere; }
.research-article > h2, .research-article > h3, .research-article > h4 { margin-top: 2.2rem; color: #ffffff; }
.research-article > p, .research-article > ul, .research-article > ol, .research-article > blockquote, .research-article > .table-wrap, .research-article > pre { margin: 1rem 0; }
.research-article ul, .research-article ol { padding-left: 1.4rem; }
.research-article li { margin: .38rem 0; }
.research-article code {
  color: #ffe29a;
  background: rgba(246,193,77,.14);
  border-radius: 5px;
  padding: .08rem .25rem;
  overflow-wrap: anywhere;
  word-break: break-word;
}
.research-article pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #08101d;
  white-space: pre;
}
.research-article pre code {
  display: block;
  min-width: max-content;
  background: transparent;
  padding: 0;
  color: #f8e7b0;
  word-break: normal;
  overflow-wrap: normal;
}
blockquote { margin-left: 0; padding: .2rem 1rem; border-left: 3px solid var(--teal); color: var(--soft); background: rgba(75,216,207,.09); }
.table-wrap { max-width: 100%; overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; }
table { width: 100%; border-collapse: collapse; min-width: 620px; }
th, td { padding: .75rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--teal); background: rgba(255,255,255,.05); }
.page-pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2.5rem; border-top: 1px solid var(--line); padding-top: 1.2rem; }
.pager-link { color: var(--teal); text-decoration: none; font-weight: 700; }

.site-footer { border-top: 1px solid var(--line); padding: 2rem 0; background: rgba(0,0,0,.16); }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; color: var(--soft); }
.footer-grid p { margin: .35rem 0; }
.footer-grid a { color: var(--teal); }

@media (max-width: 900px) {
  .header-inner, .top-nav { align-items: flex-start; justify-content: flex-start; }
  .header-inner { flex-direction: column; padding: .9rem 0; }
  .hero-grid, .intro-grid, .overview-grid, .article-layout, .footer-grid { grid-template-columns: 1fr; }
  .progress-card { position: static; }
  .progression-grid { grid-template-columns: 1fr; }
  .home-hero, .page-hero { padding-top: 3.5rem; }
  h1 { font-size: clamp(2rem, 11vw, 3.2rem); }
  .page-pager { flex-direction: column; }
  table { min-width: 560px; }
}

@media (max-width: 560px) {
  .container, .narrow { width: min(100% - 1.2rem, 1180px); }
  .top-nav a { padding: .42rem .55rem; font-size: .86rem; }
  .home-hero, .page-hero { padding: 2.5rem 0 2rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .button { text-align: center; }
  .content-card, .status-card, .summary-box, .hero-panel, .progress-card, .progression-card { padding: 1rem; }
  .article-layout { gap: .9rem; }
  .research-article > h2 { font-size: 1.55rem; }
  .research-article > h3 { font-size: 1.24rem; }
  .research-article pre { font-size: .88rem; }
}