:root {
  --ai-study-red: #ff6b8e;
  --ai-study-action: #9f1239;
  --ai-study-action-hover: #7f1232;
  --ai-study-amber: #f6b84a;
  --ai-study-cyan: #53c7ff;
}

[data-theme="light"] {
  --ai-study-red: #9f1239;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font: 16px/1.72 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }

.ai-study-hero {
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 78% 12%, rgba(83, 199, 255, 0.12), transparent 30%),
    radial-gradient(circle at 20% 0, rgba(239, 70, 111, 0.12), transparent 34%),
    var(--hero-bg);
}

.ai-study-hero__inner,
.ai-study-layout {
  width: min(1240px, calc(100% - 32px));
  margin: 0 auto;
}

.ai-study-hero__inner { padding: clamp(38px, 6vw, 78px) 0 42px; }
.ai-study-eyebrow { margin: 0 0 12px; color: var(--ai-study-red); font-size: 0.78rem; font-weight: 850; letter-spacing: 0.14em; text-transform: uppercase; }
.ai-study-title { max-width: 1010px; margin: 0; color: var(--text); font-size: clamp(2.35rem, 6vw, 5.4rem); line-height: 0.98; letter-spacing: -0.045em; }
.ai-study-deck { max-width: 920px; margin: 22px 0 0; color: var(--panel-ink-soft); font-size: clamp(1.05rem, 2vw, 1.28rem); }
.ai-study-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.ai-study-chip { display: inline-flex; align-items: center; min-height: 32px; padding: 5px 11px; border: 1px solid var(--line); border-radius: 999px; background: var(--chip); color: var(--panel-ink-soft); font-size: 0.78rem; font-weight: 750; }
.ai-study-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0 0; }
.ai-study-button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; padding: 0 16px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); color: var(--text); font-weight: 800; text-decoration: none; }
.ai-study-button:hover { border-color: var(--accent); background: var(--surface-hover); text-decoration: none; }
.ai-study-button--primary { border-color: var(--ai-study-action); background: var(--ai-study-action); color: #fff; }
.ai-study-button--primary:hover { border-color: var(--ai-study-action-hover); background: var(--ai-study-action-hover); color: #fff; }
.ai-study-cover { display: block; width: 100%; height: auto; margin-top: clamp(28px, 5vw, 48px); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); background: #030814; }

.ai-study-lineage { border-bottom: 1px solid var(--line); background: var(--bg-elevated); }
.ai-study-lineage__inner { display: grid; grid-template-columns: repeat(4, 1fr); width: min(1240px, calc(100% - 32px)); margin: 0 auto; padding: 18px 0; }
.ai-study-lineage__step { position: relative; padding: 8px 20px; border-left: 1px solid var(--line); }
.ai-study-lineage__step:first-child { border-left: 0; }
.ai-study-lineage__value { display: block; color: var(--text); font-size: 1.6rem; font-weight: 900; line-height: 1; }
.ai-study-lineage__label { display: block; margin-top: 6px; color: var(--muted); font-size: 0.78rem; }

.ai-study-layout { display: grid; grid-template-columns: minmax(0, 900px) minmax(240px, 300px); gap: 32px; align-items: start; padding: 46px 0 80px; }
.ai-study-article { min-width: 0; padding: clamp(22px, 4vw, 46px); border: 1px solid var(--line); border-radius: 16px; background: var(--panel-translucent); box-shadow: var(--shadow); color: var(--panel-ink-soft); }
.ai-study-article > p:first-child { margin-top: 0; font-size: 1.08rem; color: var(--panel-ink); }
.ai-study-article h2,
.ai-study-article h3 { color: var(--panel-ink); scroll-margin-top: 90px; }
.ai-study-article h2 { margin: 50px 0 14px; padding-top: 8px; border-top: 1px solid var(--line); font-size: clamp(1.55rem, 3vw, 2.05rem); line-height: 1.18; }
.ai-study-article h2:first-of-type { margin-top: 26px; }
.ai-study-article h3 { margin: 30px 0 10px; font-size: 1.25rem; }
.ai-study-article p { margin: 0 0 18px; }
.ai-study-article ul,
.ai-study-article ol { margin: 0 0 22px; padding-left: 1.45rem; }
.ai-study-article li { margin: 8px 0; padding-left: 0.2rem; }
.ai-study-article blockquote { margin: 24px 0; padding: 18px 20px; border: 1px solid color-mix(in srgb, var(--ai-study-amber) 55%, var(--line)); border-left: 4px solid var(--ai-study-amber); border-radius: 10px; background: color-mix(in srgb, var(--ai-study-amber) 8%, var(--panel)); color: var(--panel-ink); }
.ai-study-article blockquote p:last-child { margin-bottom: 0; }
.ai-study-table-wrap { max-width: 100%; }
.ai-study-table-wrap:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.ai-study-article table { width: 100%; margin: 20px 0 28px; border: 1px solid var(--line); border-collapse: collapse; font-size: 0.9rem; }
.ai-study-article th,
.ai-study-article td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.ai-study-article th { background: var(--chip); color: var(--panel-ink); font-weight: 850; }
.ai-study-article tbody tr:nth-child(even) { background: color-mix(in srgb, var(--chip) 48%, transparent); }
.ai-study-article code { padding: 0.12em 0.34em; border-radius: 4px; background: var(--chip); color: var(--panel-ink); }
.ai-study-article pre { overflow-x: auto; margin: 20px 0 28px; padding: 18px; border: 1px solid var(--line); border-radius: 10px; background: #040b17; color: #d9e6f8; }
.ai-study-article pre code { padding: 0; background: transparent; color: inherit; }
.ai-study-figure { margin: 24px 0 34px; }
.ai-study-figure img { display: block; width: 100%; height: auto; border: 1px solid var(--line); border-radius: 12px; background: #07101f; }
.ai-study-figure figcaption { margin-top: 8px; color: var(--panel-muted); font-size: 0.8rem; text-align: center; }

.ai-study-aside { position: sticky; top: 84px; display: grid; gap: 14px; }
.ai-study-aside__card { padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel-translucent); box-shadow: var(--shadow); }
.ai-study-aside__card h2 { margin: 0 0 10px; color: var(--panel-ink); font-size: 1rem; }
.ai-study-aside__card p { margin: 0 0 10px; color: var(--panel-muted); font-size: 0.82rem; }
.ai-study-aside__card ul { margin: 0; padding-left: 1.1rem; }
.ai-study-aside__card li { margin: 7px 0; font-size: 0.82rem; }
.ai-study-warning { border-color: color-mix(in srgb, var(--ai-study-amber) 55%, var(--line)); }

@media (max-width: 960px) {
  .ai-study-layout { grid-template-columns: 1fr; }
  .ai-study-aside { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .ai-study-lineage__inner { grid-template-columns: repeat(2, 1fr); }
  .ai-study-lineage__step:nth-child(3) { border-left: 0; }
  .ai-study-aside { grid-template-columns: 1fr; }
  .ai-study-article { padding: 20px 16px; }
  .ai-study-table-wrap { overflow-x: auto; }
  .ai-study-article table { min-width: max-content; white-space: nowrap; }
}

@media (max-width: 430px) {
  .ai-study-hero__inner,
  .ai-study-layout,
  .ai-study-lineage__inner { width: min(100% - 20px, 1240px); }
  .ai-study-title { font-size: 2.25rem; }
  .ai-study-lineage__step { padding: 8px 10px; }
}

@media print {
  .ai-study-actions,
  .ai-study-aside { display: none; }
  .ai-study-layout { display: block; width: 100%; padding: 0; }
  .ai-study-article { border: 0; box-shadow: none; }
}