/* ── Tokens ───────────────────────────────────────────── */
:root {
  --bg: #ffffff;
  --fg: #18181b;
  --muted: #71717a;
  --faint: #a1a1aa;
  --line: #e4e4e7;
  --card: #fafafa;
  --card-hover: #f4f4f5;
  --accent: #2563eb;
  --avatar-bg: #18181b;
  --avatar-fg: #ffffff;
  --radius: 12px;
  --w: 680px;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #0c0c0d;
  --fg: #ececee;
  --muted: #9b9ba3;
  --faint: #6b6b73;
  --line: #26262a;
  --card: #141416;
  --card-hover: #1c1c1f;
  --accent: #7aa7ff;
  --avatar-bg: #ececee;
  --avatar-fg: #0c0c0d;
  color-scheme: dark;
}

/* ── Base ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 17px/1.65 "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  transition: background-color .2s, color .2s;
}
a { color: inherit; }
img { max-width: 100%; }
[hidden] { display: none !important; }

.skip {
  position: absolute; left: 16px; top: -48px;
  background: var(--fg); color: var(--bg);
  padding: 8px 12px; border-radius: 8px; text-decoration: none; z-index: 10;
}
.skip:focus { top: 12px; }

.wrap {
  max-width: var(--w);
  margin: 0 auto;
  padding-inline: 24px;
}

/* ── Header ───────────────────────────────────────────── */
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: 28px;
}
.avatar {
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--avatar-bg); color: var(--avatar-fg);
  font-weight: 600; font-size: 15px; letter-spacing: .02em;
  text-decoration: none;
  transition: transform .2s;
}
.avatar:hover { transform: rotate(-8deg) scale(1.05); }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a {
  text-decoration: none; color: var(--muted);
  font-size: 15px; font-weight: 500;
  padding: 6px 12px; border-radius: 8px;
  transition: color .15s, background-color .15s;
}
.nav a:hover { color: var(--fg); background: var(--card-hover); }
.nav a[aria-current="page"] { color: var(--fg); }

/* ── Content ──────────────────────────────────────────── */
main { padding-block: 40px 24px; }
h1 {
  font-size: clamp(2rem, 6vw, 2.6rem); line-height: 1.15;
  letter-spacing: -0.025em; font-weight: 700;
  margin: 0 0 20px;
}
h2 {
  font-size: 1.15rem; font-weight: 600; letter-spacing: -0.01em;
  margin: 0;
}
p { margin: 0 0 16px; }
.lead { font-size: 1.15rem; color: var(--fg); }
.muted { color: var(--muted); }

.prose a, .lead a, .inline-links a {
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  transition: text-decoration-color .15s;
}
.prose a:hover, .lead a:hover, .inline-links a:hover { text-decoration-color: var(--fg); }

.inline-links { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-top: 20px; font-weight: 500; }

section { margin-top: 64px; }
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 16px;
}
.more { color: var(--muted); font-size: 15px; text-decoration: none; font-weight: 500; }
.more:hover { color: var(--fg); }

/* ── Cards ────────────────────────────────────────────── */
.cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.card {
  display: block; text-decoration: none;
  padding: 18px 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: background-color .15s, transform .15s, border-color .15s;
}
.card:hover { background: var(--card-hover); transform: translateY(-1px); }
.card-title { font-weight: 600; margin: 0 0 4px; display: flex; align-items: center; gap: 8px; }
.card-title .arrow { margin-left: auto; color: var(--faint); transition: transform .15s, color .15s; }
.card:hover .arrow { transform: translateX(3px); color: var(--fg); }
.card-desc { color: var(--muted); font-size: 15px; margin: 0 0 8px; }
.card-meta { color: var(--faint); font-size: 13.5px; display: flex; flex-wrap: wrap; gap: 4px 14px; }
.lang-dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 6px; vertical-align: 0; }

.skeleton { height: 92px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--line); animation: pulse 1.4s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .5; } }

/* Videos */
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.video { text-decoration: none; }
.thumb {
  display: block; width: 100%; aspect-ratio: 16 / 9; border: 0; padding: 0; cursor: pointer;
  border-radius: var(--radius); background: var(--card) center / cover no-repeat;
  position: relative; overflow: hidden;
}
.thumb::after {
  content: ""; position: absolute; inset: 0; margin: auto; width: 54px; height: 38px; border-radius: 10px;
  background: rgba(0,0,0,.7) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M9 7l8 5-8 5z' fill='white'/%3E%3C/svg%3E") center / 26px no-repeat;
  transition: background-color .15s;
}
.thumb:hover::after { background-color: #e11d48; }
.video iframe { width: 100%; aspect-ratio: 16 / 9; border: 0; border-radius: var(--radius); }
.video-title { font-weight: 600; margin: 10px 0 2px; font-size: 15.5px; }

/* Tags */
.tags { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0; }
.tags li { font-size: 14px; padding: 4px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); }

/* ── Footer ───────────────────────────────────────────── */
.site-footer { margin-top: 96px; border-top: 1px solid var(--line); }
.site-footer .wrap {
  padding-block: 28px 40px;
  display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between;
  color: var(--muted); font-size: 14.5px;
}
.foot-links { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.icon-btn {
  display: inline-grid; place-items: center; width: 38px; height: 38px;
  border-radius: 10px; border: 0; background: transparent; color: var(--muted);
  cursor: pointer; text-decoration: none; transition: color .15s, background-color .15s;
}
.icon-btn:hover { color: var(--fg); background: var(--card-hover); }
.icon-btn svg { width: 19px; height: 19px; }
.theme-toggle .moon { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .moon { display: block; }

/* ── Entrance ─────────────────────────────────────────── */
@media (prefers-reduced-motion: no-preference) {
  main > * { animation: rise .5s both cubic-bezier(.2,.7,.2,1); }
  main > *:nth-child(2) { animation-delay: .05s; }
  main > *:nth-child(3) { animation-delay: .1s; }
  main > *:nth-child(4) { animation-delay: .15s; }
  main > *:nth-child(5) { animation-delay: .2s; }
  @keyframes rise { from { opacity: 0; transform: translateY(8px); } }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .wrap { padding-inline: 18px; }
  html:not(.js) .nav { gap: 0; flex-wrap: nowrap; min-width: 0; overflow-x: auto; scrollbar-width: none; }
  html:not(.js) .nav::-webkit-scrollbar { display: none; }
  html:not(.js) .nav a[href$="index.html"] { display: none; }
  html:not(.js) .nav a { padding: 6px 6px; font-size: 14px; white-space: nowrap; }
  .avatar { width: 38px; height: 38px; font-size: 13px; flex-shrink: 0; }
  .site-header .wrap { gap: 8px; }
  section { margin-top: 52px; }
}

/* ── About / long-form ────────────────────────────────── */
.tagline { color: var(--muted); font-size: 15px; font-weight: 500; letter-spacing: .01em; margin: -8px 0 32px; }
.prose h3 { font-size: 1.2rem; font-weight: 600; letter-spacing: -0.01em; margin: 44px 0 12px; }
.prose strong { font-weight: 600; }
.motto {
  margin: 24px 0; padding: 18px 22px;
  border-left: 3px solid var(--fg); background: var(--card);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 1.15rem; font-weight: 600; line-height: 1.5;
}

/* ── Photos ───────────────────────────────────────────── */
.avatar { overflow: hidden; }
.avatar img { width: 100%; height: 100%; object-fit: cover; display: block; }
.portrait {
  display: block; width: 120px; height: 120px; border-radius: 50%; object-fit: cover;
  margin-bottom: 24px; box-shadow: 0 0 0 4px var(--bg), 0 0 0 5px var(--line);
}

/* ── Blog post ────────────────────────────────────────── */
.back { display: inline-block; color: var(--muted); text-decoration: none; font-size: 15px; font-weight: 500; margin-bottom: 24px; }
.back:hover { color: var(--fg); }
.post-meta { color: var(--muted); font-size: 15px; margin: -8px 0 32px; }
.prose h2 { font-size: 1.35rem; margin: 44px 0 12px; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 16px; }
.prose li { margin-bottom: 6px; }
.prose li::marker { color: var(--faint); }
.prose blockquote {
  margin: 24px 0; padding: 14px 20px; border-left: 3px solid var(--fg);
  background: var(--card); border-radius: 0 var(--radius) var(--radius) 0; font-weight: 500;
}
.prose code { font: 0.88em/1.5 ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace; }
.prose :not(pre) > code { background: var(--card-hover); padding: 2px 6px; border-radius: 6px; }
.prose pre {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px; overflow-x: auto; margin: 0 0 16px; font-size: 15px;
}

/* 10/20/70 ratio block */
.ratio { display: grid; gap: 8px; margin: 8px 0 20px; }
.ratio-row {
  display: flex; align-items: baseline; gap: 16px;
  padding: 14px 18px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
}
.ratio-num { font-weight: 700; font-size: 1.35rem; letter-spacing: -0.02em; min-width: 3.2ch; }
.prose h3 { margin-top: 36px; }

.post-subtitle { font-size: 1.2rem; color: var(--muted); margin: -6px 0 14px; line-height: 1.45; }

/* Theme toggle in the header (also kept in the footer) */
.site-header .nav { margin-inline-start: auto; }
.header-theme { flex-shrink: 0; margin-inline-start: 4px; }
@media (max-width: 480px) {
  .header-theme { width: 32px; height: 32px; margin-inline-start: 2px; }
  .header-theme svg { width: 17px; height: 17px; }
}

/* ── Phone menu (☰) ───────────────────────────────────── */
.menu-toggle { display: none; }
.menu-toggle .menu-close { display: none; }
@media (max-width: 640px) {
  .js .site-header .wrap { position: relative; }
  .js .menu-toggle { display: inline-grid; margin-inline-start: auto; }
  .js .site-header .nav {
    display: none; position: absolute; z-index: 30;
    top: calc(100% - 14px); left: 16px; right: 16px; margin: 0;
    flex-direction: column; gap: 2px; padding: 8px;
    background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
    box-shadow: 0 12px 32px rgba(0, 0, 0, .12);
  }
  .js .site-header.menu-open .nav { display: flex; animation: menu-in .15s ease-out; }
  .js .site-header .nav a { display: block; padding: 11px 14px; font-size: 16px; border-radius: 8px; }
  .js .site-header .nav a[aria-current="page"] { background: var(--card-hover); }
  .js .site-header.menu-open .menu-toggle .menu-open { display: none; }
  .js .site-header.menu-open .menu-toggle .menu-close { display: block; }
  @keyframes menu-in { from { opacity: 0; transform: translateY(-4px); } }
}

/* Opening quote and section dividers in long posts */
.prose .epigraph {
  font-size: 1.15rem; font-style: italic; color: var(--muted); line-height: 1.6;
  margin: 8px 0 28px; padding-inline-start: 20px; border-inline-start: 3px solid var(--line);
}
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }