:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --ink: #172033;
  --muted: #5a6478;
  --line: #d9e0ec;
  --primary: #2354d1;
  --primary-dark: #1a40a3;
  --accent: #0f9f6e;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(23, 32, 51, 0.08);
  --shadow-sm: 0 4px 14px rgba(23, 32, 51, 0.06);
  --nav-bg: rgba(255, 255, 255, 0.92);
  --nav-hover: #eef2f8;
  --card-alt: #f3f6fc;
  --code-bg: #0f1729;
  --code-ink: #e6ecff;
  --toggle-bg: #ffffff;
  --toggle-ink: #172033;
}

html[data-theme="dark"] {
  --bg: #0d1220;
  --surface: #161d2e;
  --ink: #e8edf7;
  --muted: #9aa6bd;
  --line: #29344a;
  --primary: #6b93f5;
  --primary-dark: #b9ccff;
  --accent: #2fc38b;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.35);
  --nav-bg: rgba(16, 21, 34, 0.9);
  --nav-hover: #1e2740;
  --card-alt: #1c2740;
  --code-bg: #060a14;
  --code-ink: #dbe4ff;
  --toggle-bg: #1c2740;
  --toggle-ink: #e8edf7;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  transition: background 0.25s ease, color 0.25s ease;
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

.wrap {
  width: min(1080px, 92vw);
  margin: 0 auto;
}

/* Hero */
.hero {
  background: radial-gradient(1200px 500px at 15% -10%, #3a6bf0 0%, transparent 60%),
              linear-gradient(135deg, #2354d1 0%, #1a40a3 60%, #15357f 100%);
  color: #fff;
  padding: 72px 0 84px;
}
.hero .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.8rem;
  font-weight: 600;
  opacity: 0.85;
  margin: 0 0 14px;
}
.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  line-height: 1.1;
  margin: 0 0 16px;
  font-weight: 700;
}
.hero p.lede {
  font-size: 1.18rem;
  max-width: 640px;
  margin: 0 0 28px;
  opacity: 0.95;
}
.hero .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-bottom: 30px;
  font-size: 0.95rem;
  opacity: 0.9;
}
.hero .meta span { display: inline-flex; align-items: center; gap: 7px; }

.cta-row { display: flex; flex-wrap: wrap; gap: 14px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 13px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: #fff; color: var(--primary-dark); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: #eef2ff; }
.btn-ghost { background: rgba(255,255,255,0.08); color: #fff; border-color: rgba(255,255,255,0.5); }
.btn-ghost:hover { background: rgba(255,255,255,0.16); }

/* Sticky nav */
.modnav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.modnav .wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
}
.modnav-links {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  flex: 1;
  min-width: 0;
}
.modnav a {
  white-space: nowrap;
  text-decoration: none;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 7px 14px;
  border-radius: 999px;
}
.modnav a:hover { color: var(--ink); background: var(--nav-hover); }

.toggle-all {
  flex: 0 0 auto;
  white-space: nowrap;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--primary-dark);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease;
}
.toggle-all:hover { background: var(--nav-hover); }

/* Collapsible sections */
.section-toggle {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  cursor: pointer;
  user-select: none;
}
.section-toggle::after {
  content: "";
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  margin-left: auto;
  border-right: 2.5px solid var(--muted);
  border-bottom: 2.5px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}
section.collapsed .section-toggle::after { transform: rotate(-45deg); }
.section-toggle:focus-visible { outline: 2px solid var(--primary); outline-offset: 4px; border-radius: 6px; }
.section-body {
  overflow: hidden;
  transition: opacity 0.2s ease;
}
section.collapsed .section-body { display: none; }

/* Sections */
main section { padding: 56px 0; border-bottom: 1px solid var(--line); }
section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 10px;
}
section .sub { color: var(--muted); margin: 0 0 28px; max-width: 680px; }

/* Cards grid */
.grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 22px 24px;
  box-shadow: var(--shadow-sm);
}
.card h3 { margin: 0 0 6px; font-size: 1.15rem; }
.card .time {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.card p { margin: 0 0 14px; color: var(--muted); }
.card .result {
  font-size: 0.9rem;
  color: var(--ink);
  background: var(--card-alt);
  border-left: 3px solid var(--primary);
  padding: 10px 14px;
  border-radius: 0 8px 8px 0;
  margin-top: 8px;
}

/* Download cards */
.downloads .grid { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.dl {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.dl .file { font-weight: 600; }
.dl .desc { color: var(--muted); font-size: 0.92rem; flex: 1; }
.dl a.download {
  align-self: flex-start;
  margin-top: 12px;
  font-weight: 600;
  text-decoration: none;
  color: var(--primary);
}
.dl a.download:hover { text-decoration: underline; }

/* Prompt cards */
.prompt-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: 18px;
}
.prompt-card .ph {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: var(--card-alt);
  border-bottom: 1px solid var(--line);
}
.prompt-card .ph strong { font-size: 0.95rem; }
.copy-button {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--primary-dark);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 6px 13px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease;
}
.copy-button:hover { background: var(--nav-hover); }
.copy-button.copied { background: var(--accent); color: #fff; border-color: var(--accent); }
.prompt-card pre {
  margin: 0;
  padding: 16px;
  background: var(--code-bg);
  color: var(--code-ink);
  overflow-x: auto;
  font-size: 0.92rem;
  line-height: 1.55;
}
.prompt-card code { font-family: "Cascadia Code", "Consolas", ui-monospace, monospace; }

/* Links list */
.links { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.links li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 18px;
}
.links a { font-weight: 600; text-decoration: none; }
.links a:hover { text-decoration: underline; }
.links .d { display: block; color: var(--muted); font-size: 0.9rem; margin-top: 2px; }

/* Takeaways */
.takeaways .grid { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.takeaway {
  background: linear-gradient(135deg, var(--surface), var(--card-alt));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
.takeaway .num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 10px;
}

/* Footer */
footer {
  padding: 40px 0 60px;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

@media (max-width: 640px) {
  .hero { padding: 54px 0 64px; }
  main section { padding: 42px 0; }
  .theme-toggle .tt-label { display: none; }
  .theme-toggle { padding: 9px; }
}

/* Agenda */
.agenda-list {
  list-style: none;
  counter-reset: ag;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.agenda-list li {
  counter-increment: ag;
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 20px 16px 58px;
  box-shadow: var(--shadow-sm);
}
.agenda-list li::before {
  content: counter(ag);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.agenda-list .ag-time {
  flex: 0 0 auto;
  min-width: 62px;
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  padding: 4px 10px;
  border-radius: 999px;
  text-align: center;
  margin-top: 2px;
}
.agenda-list .ag-body { display: flex; flex-direction: column; gap: 2px; }
.agenda-list .ag-body strong { font-size: 1.02rem; }
.agenda-list .ag-body span { color: var(--muted); font-size: 0.92rem; }

@media (max-width: 560px) {
  .agenda-list li { flex-wrap: wrap; }
}

/* Theme toggle */
.theme-toggle {
  position: fixed;
  top: 16px;
  right: 18px;
  z-index: 60;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--toggle-bg);
  color: var(--toggle-ink);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background 0.2s ease, color 0.2s ease, transform 0.08s ease;
}
.theme-toggle:hover { transform: translateY(-1px); }
.theme-toggle:active { transform: translateY(0); }
.theme-toggle .tt-icon { font-size: 1rem; line-height: 1; }