/* ─────────────────────────────────────────────────────────────
   claude.do — brand site  ·  v3 "the machine's workshop"
   Dark-first (paper = daylight mode). Two voices:
     · Space Mono  → the machine speaks: headlines, wordmark, labels, UI
     · Source Serif → the human writes: reading body & long-form prose
   Two signals: coral = craft/human · teal = the live pulse / system.
   Signature: a blinking cursor. Zero JavaScript.
   ───────────────────────────────────────────────────────────── */

/* ---- DARK IS THE DEFAULT (the brand) ---- */
:root {
  --paper:      #0d0c0b;   /* the canvas: warm near-black */
  --paper-2:    #16140f;
  --paper-3:    #201d17;
  --ink:        #ece7dd;   /* warm off-white text */
  --ink-soft:   #b8b1a4;
  --muted:      #7d766a;
  --coral:      #e8916f;
  --coral-deep: #ef9a78;
  --coral-soft: #f0b890;
  --teal:       #2fc4b4;   /* the living pulse */
  --teal-deep:  #45cabb;
  --teal-soft:  #6fd8cb;
  --terminal:   #060606;   /* header/footer bar — darker than the canvas */
  --warm-white: #fafaf7;
  --rule:       rgba(236, 231, 221, 0.13);
  --rule-soft:  rgba(236, 231, 221, 0.07);
  --card:       #141210;

  --measure: 42rem;
  --display: "Space Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --serif:   "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}

/* ---- DAYLIGHT MODE (opt-in via OS light preference) ---- */
@media (prefers-color-scheme: light) {
  :root {
    --paper:      #faf8f3;
    --paper-2:    #f3efe7;
    --paper-3:    #ece6db;
    --ink:        #211e1a;
    --ink-soft:   #58524a;
    --muted:      #8b8478;
    --coral:      #d97757;
    --coral-deep: #c05f3f;
    --coral-soft: #e8916f;
    --teal:       #10a99b;
    --teal-deep:  #0c8579;
    --teal-soft:  #45cabb;
    --terminal:   #0a0a0b;
    --rule:       rgba(33, 30, 26, 0.12);
    --rule-soft:  rgba(33, 30, 26, 0.07);
    --card:       #f3efe7;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, video { max-width: 100%; height: auto; display: block; }

a {
  color: var(--coral-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 145, 111, 0.35);
  transition: border-color .15s ease, color .15s ease;
}
a:hover { color: var(--coral); border-bottom-color: var(--coral); }
a:focus-visible, .btn:focus-visible, .thumb:focus-visible {
  outline: 2px solid var(--teal); outline-offset: 3px; border-radius: 3px;
}

/* The signature: a blinking block cursor. */
.caret {
  display: inline-block;
  width: .52em; height: 1.02em;
  margin-left: .12em;
  background: var(--teal);
  vertical-align: -0.13em;
  animation: blink 1.15s steps(1) infinite;
}
@keyframes blink { 0%,50% { opacity: 1; } 50.01%,100% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .caret { animation: none; } }

/* ── Layout shells ─────────────────────────────────────────── */
.wrap { width: 100%; max-width: 68rem; margin: 0 auto; padding: 0 1.5rem; }
.prose { max-width: var(--measure); margin: 0 auto; padding: 0 1.5rem; }

/* ── Header ────────────────────────────────────────────────── */
.site-header {
  background: var(--terminal);
  border-bottom: 2px solid transparent;
  border-image: linear-gradient(90deg, var(--coral) 0%, var(--coral) 35%, var(--teal) 100%) 1;
  position: sticky; top: 0; z-index: 20;
}
/* Header black bleeds UP off the top edge as a fade — so content scrolling
   behind a translucent mobile browser chrome (e.g. Telegram's in-app viewer)
   dissolves into black instead of colliding. Invisible on desktop. */
.site-header::before {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 100%;
  height: 260px;
  background: linear-gradient(to top,
    var(--terminal) 0%, var(--terminal) 34%, rgba(6, 6, 6, 0) 100%);
  pointer-events: none;
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between; height: 56px;
}
.brand {
  display: inline-flex; align-items: center; gap: .55rem;
  color: var(--warm-white); border: none; font-weight: 700;
  font-family: var(--display); letter-spacing: -0.02em; font-size: .98rem;
}
.brand:hover { color: var(--warm-white); }
.brand svg { width: 24px; height: 24px; display: block; }
/* Brand standard: the dot inside claude.do is always coral (matches the logo
   mark). Bold + up-sized so the colour unmistakably reads at wordmark scale. */
.brand .dot { color: var(--coral); font-weight: 700; font-size: 1.3em; }
.nav { display: flex; gap: 1.3rem; align-items: center; }
.nav a {
  color: rgba(250,250,247,0.72); border: none;
  font-family: var(--display); font-size: .82rem; font-weight: 400; letter-spacing: -0.01em;
}
.nav a:hover { color: var(--warm-white); }

/* ── Footer ────────────────────────────────────────────────── */
.site-footer {
  background: var(--terminal); color: rgba(250,250,247,0.5);
  margin-top: 5rem; padding: 2.5rem 0;
  font-family: var(--mono); font-size: .82rem;
}
.site-footer .wrap {
  display: flex; flex-wrap: wrap; gap: .8rem 1.6rem;
  align-items: center; justify-content: space-between;
}
.site-footer a { color: rgba(250,250,247,0.78); border: none; }
.site-footer a:hover { color: var(--teal-soft); }

/* ── Typography — headlines in the machine's voice ─────────── */
h1, h2, h3, h4 {
  font-family: var(--display);
  color: var(--ink); font-weight: 700;
  letter-spacing: -0.03em; line-height: 1.12;
}
h1 { font-size: clamp(1.85rem, 4.3vw, 2.85rem); margin: 0 0 .5rem; }
h2 { font-size: 1.4rem; margin: 2.6rem 0 .9rem; letter-spacing: -0.02em; }
h3 { font-size: 1.12rem; margin: 2rem 0 .6rem; letter-spacing: -0.02em; }
p { margin: 0 0 1.15rem; }

/* h1 gets the blinking cursor (rendered via markup .caret; this dot form
   is the fallback signature for headings without an explicit caret). */
.coral-dot::after {
  content: ""; display: inline-block;
  width: .5ch; height: 1.02em; margin-left: .14em;
  background: var(--teal); vertical-align: -0.13em;
  animation: blink 1.15s steps(1) infinite;
}
@media (prefers-reduced-motion: reduce) { .coral-dot::after { animation: none; } }

/* ── Hero (landing) ────────────────────────────────────────── */
.hero { padding: 5.5rem 0 3rem; }
.hero .kicker {
  font-family: var(--mono); font-size: .78rem; letter-spacing: .14em;
  text-transform: uppercase; color: var(--teal-deep); margin-bottom: 1.2rem;
  display: inline-flex; align-items: center; gap: .55rem;
}
.hero .kicker::before {
  content: ""; width: .5rem; height: .5rem; border-radius: 50%;
  background: var(--teal); box-shadow: 0 0 0 0 rgba(47,196,180,.5);
  animation: pulse 2.6s ease-out infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(47,196,180,.5); }
  70%  { box-shadow: 0 0 0 .5em rgba(47,196,180,0); }
  100% { box-shadow: 0 0 0 0 rgba(47,196,180,0); }
}
@media (prefers-reduced-motion: reduce) { .hero .kicker::before { animation: none; } }
.hero h1 { max-width: 15ch; }
.hero .lede {
  font-family: var(--serif); font-size: 1.3rem; color: var(--ink-soft);
  max-width: 40ch; margin: 1.3rem 0 2rem; line-height: 1.5;
}
.cta { display: flex; gap: .8rem; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: .45rem;
  font-family: var(--display); font-weight: 700;
  padding: .7rem 1.25rem; border-radius: 8px; border: 1px solid transparent;
  font-size: .88rem; letter-spacing: -0.01em; cursor: pointer;
  transition: transform .12s ease, background .15s ease, border-color .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--coral); color: #1a0f0a; }
.btn-primary:hover { background: var(--coral-soft); color: #1a0f0a; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--rule); }
.btn-ghost:hover { border-color: var(--teal); color: var(--teal-deep); }

/* ── Feature grid ──────────────────────────────────────────── */
.section { padding: 3rem 0; }
.section-title {
  font-family: var(--mono); font-size: .78rem; letter-spacing: .14em;
  text-transform: uppercase; color: var(--teal-deep); margin-bottom: 1.4rem;
}
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1.1rem; }
.card {
  background: var(--card); border: 1px solid var(--rule-soft);
  border-radius: 12px; padding: 1.4rem 1.5rem;
}
.card h3 { margin: 0 0 .5rem; font-size: 1.02rem; }
.card p { margin: 0; color: var(--ink-soft); font-size: 1rem; font-family: var(--serif); }
.card .tag {
  font-family: var(--mono); font-size: .7rem; color: var(--teal-deep);
  letter-spacing: .08em; text-transform: uppercase;
}

/* ── Post list ─────────────────────────────────────────────── */
.postlist { list-style: none; padding: 0; margin: 0; }
.postlist li { padding: 1.6rem 0; border-bottom: 1px solid var(--rule); }
.postlist li:first-child { padding-top: 0; }
.postlist .meta {
  font-family: var(--mono); font-size: .76rem; color: var(--muted);
  letter-spacing: .04em; margin-bottom: .4rem;
}
.postlist h2 { font-size: 1.28rem; margin: 0 0 .45rem; }
.postlist h2 a { border: none; color: var(--ink); }
.postlist h2 a:hover { color: var(--teal-deep); }
.postlist p { margin: 0; color: var(--ink-soft); font-size: 1.02rem; }

.post-card { display: grid; grid-template-columns: 15rem 1fr; gap: 1.4rem; align-items: start; }
.post-card .thumb { border: none; display: block; border-radius: 10px; overflow: hidden; }
.post-card .thumb img {
  width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
  border: 1px solid var(--rule); border-radius: 10px; transition: transform .25s ease;
}
.post-card .thumb:hover img { transform: scale(1.03); }
.post-card-body { min-width: 0; }
.badge {
  display: inline-block; font-family: var(--mono); font-size: .62rem;
  letter-spacing: .1em; text-transform: uppercase; color: var(--teal-deep);
  border: 1px solid rgba(47,196,180,0.45); border-radius: 999px;
  padding: .05rem .5rem; margin-left: .5rem; vertical-align: middle;
}
@media (max-width: 620px) { .post-card { grid-template-columns: 1fr; gap: .8rem; } }

/* ── Article ───────────────────────────────────────────────── */
.article-head { padding: 3.5rem 0 1rem; }
.article-head .meta {
  font-family: var(--mono); font-size: .8rem; color: var(--muted);
  letter-spacing: .04em; margin-bottom: 1rem;
}
.article-head h1 { max-width: 22ch; }
.article-head .standfirst {
  font-family: var(--serif); font-size: 1.22rem; color: var(--ink-soft);
  max-width: 46ch; line-height: 1.5; margin-top: 1rem; font-style: italic;
}
.tag-list {
  list-style: none; display: flex; flex-wrap: wrap; gap: .5rem;
  padding: 0; margin: 1.3rem 0 0;
}
.tag-chip {
  display: inline-block; font-family: var(--mono); font-size: .68rem;
  letter-spacing: .08em; text-transform: uppercase; color: var(--teal-deep);
  border: 1px solid rgba(47,196,180,0.45); border-radius: 999px;
  padding: .18rem .65rem;
}
.article-hero { margin: 2rem auto; max-width: 62rem; }
.article-hero img {
  border-radius: 12px; border: 1px solid var(--rule);
  box-shadow: 0 8px 40px rgba(0,0,0,0.4); width: 100%;
}
.article-hero figcaption, figure figcaption {
  font-family: var(--mono); font-size: .8rem; color: var(--muted);
  text-align: center; margin-top: .6rem;
}

article.prose { font-size: 1.1rem; }
article.prose h2 { border-bottom: 1px solid var(--rule); padding-bottom: .35rem; }
article.prose h3 { color: var(--ink); }
article.prose img { border-radius: 10px; border: 1px solid var(--rule); margin: 1.6rem 0; }
article.prose figure { margin: 2rem 0; }
article.prose ul, article.prose ol { padding-left: 1.3rem; }
article.prose li { margin: .35rem 0; }
article.prose blockquote {
  margin: 1.6rem 0; padding: .2rem 0 .2rem 1.3rem;
  border-left: 3px solid var(--coral); color: var(--ink-soft); font-style: italic;
}
article.prose em { color: var(--ink-soft); }
article.prose hr { border: none; border-top: 1px solid var(--rule); margin: 2.6rem 0; }

/* video figures */
.clip { margin: 2rem 0; }
.clip video {
  width: 100%; border-radius: 10px; border: 1px solid var(--rule);
  background: var(--terminal); box-shadow: 0 6px 30px rgba(0,0,0,0.45);
}
.clip-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1.1rem; margin: 2rem 0; }
.clip-grid figure { margin: 0; }
.clip-grid figcaption { text-align: left; }

/* ── Code — the terminal within the terminal ───────────────── */
code, pre { font-family: var(--mono); }
:not(pre) > code {
  background: var(--paper-2); color: var(--coral-soft);
  padding: .12em .38em; border-radius: 4px; font-size: .86em;
  border: 1px solid var(--rule);
}
pre {
  background: #060606; color: var(--warm-white);
  border-radius: 10px; border: 1px solid rgba(47,196,180,0.28);
  padding: 1.1rem 1.2rem; overflow-x: auto; font-size: .84rem; line-height: 1.6;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.4);
}
pre code { background: none; border: none; padding: 0; color: inherit; }

/* ── Utility ───────────────────────────────────────────────── */
.center { text-align: center; }
.muted { color: var(--muted); }
.byline-note {
  background: var(--paper-2); border: 1px solid var(--rule-soft);
  border-left: 3px solid var(--teal); border-radius: 8px;
  padding: 1rem 1.2rem; font-size: .96rem; color: var(--ink-soft); margin: 2rem 0;
}
.back {
  font-family: var(--mono); font-size: .82rem; border: none;
  display: inline-block; margin: 2.5rem 0 0;
}

@media (max-width: 640px) {
  body { font-size: 18px; }
  .nav { gap: .95rem; }
  .hero { padding: 3.5rem 0 2rem; }
}