/* =====================================================================
   Chan Makes, ship log
   Plain CSS, no build step. See DESIGN.md for the system rationale.
   ===================================================================== */

:root {
  /* Color, OKLCH. Warm-tinted neutrals, one committed signal accent. */
  --paper:       oklch(0.972 0.008 75);
  --paper-2:     oklch(0.948 0.011 75);
  --ink:         oklch(0.235 0.012 60);
  --ink-2:       oklch(0.475 0.013 60);
  --ink-3:       oklch(0.62 0.012 60);
  --line:        oklch(0.885 0.010 75);
  --line-soft:   oklch(0.915 0.009 75);
  --signal:      oklch(0.605 0.205 33);
  --signal-deep: oklch(0.505 0.200 33);
  --ok:          oklch(0.60 0.120 150);

  /* Type */
  --sans: "Archivo", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", "Cascadia Code", monospace;

  /* Fluid scale, >=1.25 ratio */
  --step--1: clamp(0.78rem, 0.76rem + 0.10vw, 0.84rem);
  --step-0:  clamp(1.0rem, 0.96rem + 0.20vw, 1.12rem);
  --step-1:  clamp(1.30rem, 1.18rem + 0.55vw, 1.62rem);
  --step-2:  clamp(1.75rem, 1.45rem + 1.30vw, 2.60rem);
  --step-3:  clamp(2.6rem, 1.7rem + 3.3vw, 5.05rem);

  /* Space */
  --gap: clamp(1rem, 0.7rem + 1.2vw, 1.6rem);
  --bleed: clamp(1.25rem, 0.6rem + 3vw, 3.5rem);
  --rail-w: clamp(180px, 16vw, 232px);

  /* Motion */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--step-0);
  line-height: 1.55;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { margin: 0; line-height: 1.04; font-weight: 800; letter-spacing: -0.02em; }
p { margin: 0; }
ol, ul { margin: 0; padding: 0; list-style: none; }
em { font-style: normal; }

::selection { background: var(--signal); color: var(--paper); }

a { color: inherit; }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--paper);
  padding: 0.6rem 1rem; z-index: 50; border-radius: 0 0 6px 0;
  font-family: var(--mono); font-size: var(--step--1);
}
.skip:focus { left: 0; }

:focus-visible {
  outline: 2px solid var(--signal-deep);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Shell layout ---------- */
.shell {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  max-width: 1180px;
  margin-inline: auto;
}

/* ---------- Left rail ---------- */
.rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  height: 100dvh;
  padding: var(--bleed) 0 var(--bleed) var(--bleed);
  display: flex;
  flex-direction: column;
  gap: 2rem;
  border-right: 1px solid var(--line);
}

.mark { text-decoration: none; display: inline-flex; align-items: baseline; gap: 0.4rem; }
.mark__name { font-size: var(--step-1); font-weight: 900; letter-spacing: -0.03em; }
.mark__sub { font-family: var(--mono); font-size: var(--step--1); color: var(--signal-deep); font-weight: 500; }

.rail__nav { display: flex; flex-direction: column; gap: 0.65rem; margin-top: 0.5rem; }
.rail__nav a {
  text-decoration: none;
  color: var(--ink-2);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.01em;
  display: inline-flex; align-items: baseline; gap: 0.55rem;
  width: max-content;
  transition: color 0.25s var(--ease-out-quart);
}
.rail__nav a:hover { color: var(--ink); }
.rail__nav a[aria-current="true"] { color: var(--ink); }
.rail__nav a[aria-current="true"] .idx { color: var(--signal-deep); }
.rail__nav .idx { font-family: var(--mono); font-size: 0.72em; color: var(--ink-3); font-weight: 500; transition: color 0.25s var(--ease-out-quart); }

.rail__live {
  margin-top: auto;
  font-family: var(--mono);
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  color: var(--ink-2);
  display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
}
.rail__live-text { font-weight: 600; color: var(--ink); }
.rail__stamp { color: var(--ink-3); }

/* Pulsing status dot */
.dot {
  --d: 7px;
  width: var(--d); height: var(--d); border-radius: 50%;
  background: var(--signal); display: inline-block; flex: none;
  position: relative;
}
.rail__live .dot::after {
  content: ""; position: absolute; inset: 0; border-radius: 50%;
  background: var(--signal);
  animation: ping 2.4s var(--ease-out-expo) infinite;
}
.dot--ok { background: var(--ok); }
@keyframes ping {
  0%   { transform: scale(1);   opacity: 0.55; }
  70%  { transform: scale(3.2); opacity: 0; }
  100% { transform: scale(3.2); opacity: 0; }
}

/* ---------- Main column ---------- */
.main { padding: var(--bleed); padding-bottom: 0; min-width: 0; }

/* ---------- Hero ---------- */
.hero { padding: clamp(2rem, 6vh, 6rem) 0 clamp(3rem, 8vh, 6rem); max-width: 54ch; }
.kicker {
  font-family: var(--mono); font-size: var(--step--1);
  letter-spacing: 0.08em; color: var(--signal-deep); font-weight: 500;
  margin-bottom: 1.4rem;
}
.thesis { font-size: var(--step-3); font-weight: 900; letter-spacing: -0.035em; }
.thesis span { display: block; }
.thesis em { color: var(--signal); }
.lede {
  max-width: 50ch; margin-top: 1.6rem;
  font-size: var(--step-1); line-height: 1.45; color: var(--ink-2); font-weight: 400;
}

/* Signal sparkline */
.signal { margin: clamp(2rem, 5vh, 3.4rem) 0 0; position: relative; max-width: 640px; }
.signal__svg { display: block; width: 100%; height: clamp(48px, 9vw, 72px); overflow: visible; }
.signal__path {
  stroke: var(--signal);
  stroke-linecap: round; stroke-linejoin: round;
  stroke-dasharray: 1; stroke-dashoffset: 1;
  animation: draw 1.9s var(--ease-out-expo) 0.4s forwards;
}
@keyframes draw { to { stroke-dashoffset: 0; } }
.signal__pulse {
  position: absolute; right: -3px; top: 38%;
  width: 9px; height: 9px; border-radius: 50%; background: var(--signal);
  opacity: 0; animation: pulseIn 0.5s var(--ease-out-expo) 2.2s forwards;
}
.signal__pulse::after {
  content: ""; position: absolute; inset: 0; border-radius: 50%; background: var(--signal);
  animation: ping 2.4s var(--ease-out-expo) 2.6s infinite;
}
@keyframes pulseIn { from { opacity: 0; transform: scale(0.2); } to { opacity: 1; transform: scale(1); } }

/* Stats */
.stats { display: flex; gap: clamp(1.6rem, 4vw, 3rem); margin-top: clamp(1.8rem, 4vh, 2.6rem); }
.stat dt {
  font-family: var(--mono); font-size: var(--step--1); letter-spacing: 0.05em;
  color: var(--ink-3); text-transform: lowercase;
}
.stat dd { margin: 0.15rem 0 0; font-size: var(--step-2); font-weight: 800; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }

/* ---------- Sections ---------- */
.section { padding: clamp(2.6rem, 7vh, 5rem) 0; border-top: 1px solid var(--line); }
.section__head { margin-bottom: clamp(1.6rem, 4vh, 2.6rem); }
.section__title { font-size: var(--step-2); font-weight: 800; letter-spacing: -0.03em; }
.section__note { margin-top: 0.5rem; color: var(--ink-2); font-size: var(--step--1); font-family: var(--mono); letter-spacing: 0.02em; }

/* ---------- Log entries ---------- */
.entry {
  display: grid;
  grid-template-columns: minmax(140px, 0.9fr) minmax(0, 2.6fr);
  gap: clamp(1rem, 3vw, 2.4rem);
  padding: clamp(1.5rem, 3.5vh, 2.3rem) 0;
  border-top: 1px solid var(--line-soft);
}
.entry:first-child { border-top: 0; }

.entry__meta { display: flex; flex-direction: column; gap: 0.55rem; align-items: flex-start; }
.entry__idx { font-family: var(--mono); font-size: var(--step--1); color: var(--ink-3); font-weight: 500; }
.entry__date { font-family: var(--mono); font-size: var(--step-0); color: var(--ink); font-weight: 500; letter-spacing: 0.01em; }

.badge {
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase;
  font-weight: 600; display: inline-flex; align-items: center; gap: 0.45rem;
  padding: 0.28rem 0.55rem; border: 1px solid var(--line); border-radius: 100px;
  color: var(--ink-2); white-space: nowrap;
}
.badge .dot { --d: 6px; }
.badge--shipping { color: var(--ink); border-color: color-mix(in oklch, var(--ok), var(--line) 55%); }
.badge--building { color: var(--signal-deep); border-color: color-mix(in oklch, var(--signal), var(--line) 45%); }
.badge--building .dot { background: var(--signal); }
.badge--specced .dot { background: var(--ink-3); }
.badge--archived { color: var(--ink-3); }
.badge--archived .dot { background: var(--ink-3); }

.entry__title { font-size: var(--step-1); font-weight: 800; letter-spacing: -0.02em; display: flex; align-items: baseline; gap: 0.7rem; flex-wrap: wrap; }
.ver { font-family: var(--mono); font-size: 0.6em; font-weight: 500; color: var(--ink-3); letter-spacing: 0; }
.entry__what { margin-top: 0.7rem; max-width: 60ch; font-size: var(--step-0); }
.entry__why { margin-top: 0.55rem; max-width: 60ch; color: var(--ink-2); }

.tags { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 1rem; }
.tags li {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.02em;
  color: var(--ink-2); background: var(--paper-2);
  padding: 0.2rem 0.5rem; border-radius: 5px;
}

.entry__action { margin-top: 1rem; font-size: var(--step--1); }
.entry__action--muted { color: var(--ink-3); font-family: var(--mono); letter-spacing: 0.02em; }

/* Inline link with underline-wipe */
.link {
  --uc: var(--signal-deep);
  color: var(--ink); text-decoration: none; font-weight: 600;
  position: relative; display: inline-flex; align-items: center; gap: 0.3rem;
  background-image: linear-gradient(var(--uc), var(--uc));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 100% 1.5px;
  padding-bottom: 1px;
  transition: background-size 0.35s var(--ease-out-expo), color 0.25s var(--ease-out-quart);
}
.entry__action .link { background-size: 0% 1.5px; }
.entry__action .link:hover, .entry__action .link:focus-visible { background-size: 100% 1.5px; color: var(--signal-deep); }
.link .arr { transition: transform 0.3s var(--ease-out-expo); }
.link:hover .arr, .link:focus-visible .arr { transform: translateX(3px); }

/* ---------- Archive ---------- */
.archive { margin-top: 1.5rem; border-top: 1px solid var(--line-soft); padding-top: 1.3rem; }
.archive summary {
  cursor: pointer; list-style: none; width: max-content;
  font-family: var(--mono); font-size: var(--step--1); color: var(--ink-2);
  letter-spacing: 0.03em; display: inline-flex; align-items: baseline; gap: 0.55rem;
  transition: color 0.2s var(--ease-out-quart);
}
.archive summary:hover { color: var(--ink); }
.archive summary::-webkit-details-marker { display: none; }
.archive__idx { color: var(--ink-3); }
.archive .entry { opacity: 0.72; border-top: 0; padding-top: 1.2rem; }
.entry--archived .entry__title { font-weight: 700; }

/* ---------- Profile ---------- */
.section--profile { }
.profile { display: grid; gap: 1.3rem; max-width: 62ch; }
.profile__lead { font-size: var(--step-1); line-height: 1.32; font-weight: 600; letter-spacing: -0.01em; }
.profile__lead { color: var(--ink); }
.profile__body { color: var(--ink-2); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); margin-top: clamp(3rem, 8vh, 6rem); }
.footer__inner {
  max-width: 1180px; margin-inline: auto;
  padding: clamp(2.4rem, 6vh, 4rem) var(--bleed);
  display: grid; gap: 1.6rem;
}
.footer__cta { font-size: var(--step-1); font-weight: 700; letter-spacing: -0.02em; max-width: 30ch; }
.footer__links { display: flex; gap: clamp(1.2rem, 4vw, 2.4rem); flex-wrap: wrap; }
.footer__links .link { font-size: var(--step-0); }
.footer__colophon {
  font-family: var(--mono); font-size: var(--step--1); color: var(--ink-3);
  letter-spacing: 0.02em; display: flex; align-items: center; gap: 0.55rem; line-height: 1.5;
  border-top: 1px solid var(--line-soft); padding-top: 1.4rem; max-width: 60ch;
}
.footer__colophon .dot { --d: 6px; background: var(--ink-3); }

/* ---------- Reveal motion (only hide when JS can un-hide) ---------- */
html.js .reveal { opacity: 0; transform: translateY(14px); }
html.js .entry, html.js .archive { opacity: 0; transform: translateY(16px); }
/* is-in must match the hidden rule's specificity to win the cascade */
html.js .reveal.is-in,
html.js .entry.is-in,
html.js .archive.is-in {
  opacity: 1; transform: none;
  transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo);
}

/* Hero reveals are staggered by JS via --i */
.hero .reveal.is-in { transition-delay: calc(var(--i, 0) * 90ms); }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .shell { grid-template-columns: 1fr; }
  .rail {
    position: static; height: auto; flex-direction: row; align-items: center;
    flex-wrap: wrap; gap: 1.2rem 1.5rem;
    border-right: 0; border-bottom: 1px solid var(--line);
    padding: var(--bleed) var(--bleed) 1.2rem;
  }
  .rail__nav { flex-direction: row; gap: 1.1rem; margin-top: 0; }
  .rail__live { margin: 0 0 0 auto; }
  .main { padding-top: clamp(1.5rem, 4vh, 2.5rem); }
  .hero { max-width: none; }
  .thesis span { display: inline; }
  .entry { grid-template-columns: 1fr; gap: 0.9rem; }
  .entry__meta { flex-direction: row; align-items: center; flex-wrap: wrap; gap: 0.7rem; }
}

@media (max-width: 400px) {
  .rail__nav .idx { display: none; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .reveal, .entry, .archive { opacity: 1 !important; transform: none !important; }
  .signal__path { animation: none; stroke-dashoffset: 0; }
  .signal__pulse { animation: none; opacity: 1; }
  .signal__pulse::after, .rail__live .dot::after { animation: none; opacity: 0; }
  .is-in { transition: none; }
}