:root {
  --on-surface: #232019;
  --on-surface-variant: #4a453a;
  --secondary: #6b6558;
  --surface: #faf9f5;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f6f4ec;
  --surface-container: #f0eee6;
  --surface-container-high: #e8e5da;
  --surface-container-highest: #e0dbcc;
  --outline: #e0dbcc;
  --outline-variant: #cec7b4;
  --accent: #c08a2e;
  --accent-strong: #8a5a00;
  --accent-container: rgba(192,138,46,0.12);
  --lab-html5: #d25319;  --lab-html5-strong: #b04a16;
  --lab-css: #2965f1;    --lab-css-strong: #2456c8;
  --lab-js: #c15f3c;     --lab-js-strong: #b4522f;
  --lab-ts: #3178c6;     --lab-ts-strong: #2563a8;
  --lab-vue: #42b883;    --lab-vue-strong: #35785f;
  --lab-react: #087ea4;  --lab-react-strong: #046e8f;
  --lab-tailwind: #38bdf8; --lab-tailwind-strong: #0369a1;
  --serif: "Noto Serif SC","Times New Roman",Times,serif;
  --sans: "Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 28px;
  --r-full: 9999px;
  --elev-1: 0 1px 3px 1px rgba(35,32,25,0.05),0 1px 2px 0 rgba(35,32,25,0.08);
  --elev-2: 0 2px 6px 2px rgba(35,32,25,0.06),0 1px 2px 0 rgba(35,32,25,0.08);
  --elev-3: 0 4px 8px 3px rgba(35,32,25,0.08),0 1px 3px 0 rgba(35,32,25,0.06);
  --state-hover: rgba(35,32,25,0.08);
  --state-focus: rgba(35,32,25,0.12);
  --ease-standard: cubic-bezier(0.2,0,0,1);
  --ease-emphasized: cubic-bezier(0.3,0,0,1);
  --page-max: 1080px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--surface-container);
  color: var(--on-surface);
  font-family: var(--sans);
  font-size: 0.95rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-strong); text-decoration: none; transition: color 150ms var(--ease-standard); }
a:hover { text-decoration: underline; }

::selection { background: rgba(192,138,46,0.24); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: var(--r-sm); }

* { scrollbar-width: thin; scrollbar-color: var(--outline-variant) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb { background: var(--outline-variant); border-radius: var(--r-full); border: 3px solid transparent; background-clip: content-box; }

.page { max-width: var(--page-max); margin: 0 auto; padding: 80px 24px 72px; }

.hero { margin: 0 0 56px; }
.hero h1 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: 3.5rem;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.hero h1::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 0.78em;
  margin-right: 18px;
  border-radius: var(--r-full);
  background: var(--accent);
  vertical-align: -0.02em;
}
.hero .sub {
  margin: 0 0 20px;
  color: var(--secondary);
  font-size: 0.9rem;
  letter-spacing: 0.01em;
}
.hero .intro {
  margin: 0;
  color: var(--on-surface-variant);
  overflow-wrap: anywhere;
}

.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
@media (max-width: 880px) { .cards { grid-template-columns: minmax(0, 1fr); } }

.card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--outline);
  border-top: 3px solid var(--card-accent);
  border-radius: var(--r-lg);
  padding: 20px 22px 18px;
  box-shadow: var(--elev-1);
  transition: box-shadow 250ms var(--ease-standard), border-color 250ms var(--ease-standard);
}
.card:hover {
  box-shadow: var(--elev-2);
}
.card-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.card-title { margin: 0; font-family: var(--serif); font-size: 1.2rem; font-weight: 600; line-height: 1.4; }
.card-title a { color: var(--on-surface); }
.card-title a:hover { color: var(--card-accent-strong); text-decoration: none; }
.card-stats { margin-left: auto; color: var(--secondary); font-size: 0.82rem; font-variant-numeric: tabular-nums; }
.card-blurb { margin: 8px 0 10px; color: var(--on-surface-variant); font-size: 0.9rem; }
.card-note { margin: 0 0 8px; color: var(--secondary); font-size: 0.82rem; }

.card-area { margin-top: auto; }

.progress-line { display: flex; align-items: baseline; gap: 8px; color: var(--secondary); font-size: 0.82rem; }
.progress-line b { color: var(--on-surface); font-variant-numeric: tabular-nums; }
.track { height: 6px; margin: 10px 0 16px; border-radius: var(--r-full); background: var(--surface-container-highest); overflow: hidden; }
.track > span { display: block; height: 100%; width: 0; background: var(--card-accent); border-radius: var(--r-full); transition: width 400ms var(--ease-emphasized); }

.card-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  font-size: 0.86rem;
  font-weight: 500;
  padding: 8px 18px;
  border-radius: var(--r-full);
  border: 1px solid transparent;
  cursor: pointer;
  line-height: 1.5;
  transition: background-color 150ms var(--ease-standard), box-shadow 150ms var(--ease-standard), color 150ms var(--ease-standard);
  position: relative;
  overflow: hidden;
}
.btn-enter { background: var(--card-accent-strong); color: var(--surface); }
.btn-enter:hover { background: var(--on-surface); color: var(--surface); text-decoration: none; box-shadow: var(--elev-1); }
.btn-ghost { background: transparent; color: var(--card-accent-strong); border-color: var(--outline); }
.btn-ghost:hover { background: var(--state-hover); border-color: var(--card-accent); text-decoration: none; }
.card-note { margin: 12px 0 0; color: var(--secondary); font-size: 0.82rem; }

.side-theme {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--outline);
  border-radius: var(--r-full);
  background: var(--surface);
  color: var(--secondary);
  cursor: pointer;
  transition: background-color 150ms var(--ease-standard), color 150ms var(--ease-standard);
}
.side-theme:hover { background: var(--state-hover); color: var(--accent-strong); }
.side-theme svg { width: 20px; height: 20px; display: block; }

.foot { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--outline); color: var(--secondary); font-size: 0.82rem; }
.foot p { margin: 0; }
.foot .credit { display: flex; align-items: center; gap: 10px; }
.gh-link { display: inline-flex; align-items: center; color: var(--secondary); transition: color 150ms var(--ease-standard); }
.gh-link:hover { color: var(--accent-strong); text-decoration: none; }
.gh-link svg { width: 16px; height: 16px; fill: currentColor; display: block; }
.noscript-note { color: var(--secondary); font-size: 0.9rem; }

.stale-banner {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 12px 20px;
  background: var(--accent-strong);
  color: var(--surface);
  font-size: 0.82rem;
  border-radius: 0;
}
.stale-banner kbd { background: rgba(255,255,255,0.18); border-radius: var(--r-sm); padding: 0 4px; }

@media (max-width: 560px) {
  .page { padding: 48px 18px 52px; }
  .hero { margin-bottom: 36px; }
  .hero h1 { font-size: 2.4rem; }
  .hero h1::before { margin-right: 12px; width: 5px; }
  .cards { gap: 16px; }
  .card { padding: 18px 18px 16px; }
  .card-actions { gap: 8px; }
  .btn { padding: 10px 16px; }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --on-surface: #e8e4d8;
    --on-surface-variant: #c8c2b0;
    --secondary: #9a9382;
    --surface: #252220;
    --surface-container-lowest: #1a1814;
    --surface-container-low: #1f1d1a;
    --surface-container: #1a1814;
    --surface-container-high: #2a2622;
    --surface-container-highest: #3a3530;
    --outline: #3a3530;
    --outline-variant: #4a4540;
    --accent: #e8a546;
    --accent-strong: #f0c060;
    --state-hover: rgba(255,255,255,0.08);
    --state-focus: rgba(255,255,255,0.12);
  }
}

:root[data-theme="dark"] {
  --on-surface: #e8e4d8;
  --on-surface-variant: #c8c2b0;
  --secondary: #9a9382;
  --surface: #252220;
  --surface-container-lowest: #1a1814;
  --surface-container-low: #1f1d1a;
  --surface-container: #1a1814;
  --surface-container-high: #2a2622;
  --surface-container-highest: #3a3530;
  --outline: #3a3530;
  --outline-variant: #4a4540;
  --accent: #e8a546;
  --accent-strong: #f0c060;
  --state-hover: rgba(255,255,255,0.08);
  --state-focus: rgba(255,255,255,0.12);
}