/* ============================================================
   Murphy's Law (Rectified) — "Release notes for optimism"
   Warm editorial skin over a software-changelog structure.
   ============================================================ */

:root {
  /* warm optimism palette */
  --bg:        oklch(0.973 0.013 80);
  --bg-deep:   oklch(0.955 0.020 78);
  --panel:     oklch(0.984 0.010 84);
  --ink:       oklch(0.275 0.022 60);
  --ink-soft:  oklch(0.470 0.022 62);
  --ink-faint: oklch(0.640 0.020 66);
  --line:      oklch(0.885 0.018 78);
  --line-soft: oklch(0.925 0.014 80);

  --sun:       oklch(0.800 0.135 72);
  --sun-deep:  oklch(0.690 0.140 58);

  --minus:     oklch(0.575 0.115 33);   /* terracotta */
  --minus-bg:  oklch(0.945 0.030 42);
  --plus:      oklch(0.545 0.095 138);  /* warm olive-green */
  --plus-bg:   oklch(0.945 0.045 132);

  --serif: "Bodoni Moda", Georgia, serif;
  --sans:  "Switzer", "IBM Plex Sans", system-ui, sans-serif;
  --sans2: "IBM Plex Sans", system-ui, sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, monospace;

  --maxw: 980px;
  --gutter: clamp(20px, 5vw, 64px);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* very soft sun glow, top-center — subtle, not a gradient wash */
body::before {
  content: "";
  position: fixed;
  inset: -20vh -20vw auto -20vw;
  height: 70vh;
  background: radial-gradient(60% 100% at 50% 0%,
              oklch(0.92 0.075 82 / 0.55), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }

::selection { background: var(--sun); color: oklch(0.25 0.03 60); }

a { color: inherit; }

/* ---------------------------------------------------------- mono labels */
.mono {
  font-family: var(--mono);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.kicker {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0;
}

/* version tag pill */
.vtag {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--sun-deep);
  border: 1px solid color-mix(in oklch, var(--sun) 55%, var(--line));
  background: color-mix(in oklch, var(--sun) 12%, var(--panel));
  padding: 0.2em 0.6em;
  border-radius: 999px;
  white-space: nowrap;
}

/* ============================================================ topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px var(--gutter);
  background: color-mix(in oklch, var(--bg) 82%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.topbar.stuck { border-color: var(--line); }
.wordmark {
  font-family: var(--serif);
  font-variation-settings: "opsz" 6;
  font-style: italic;
  font-weight: 500;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}
.wordmark sup {
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.5em;
  vertical-align: super;
  color: var(--sun-deep);
  margin-left: 0.15em;
}
.topbar__meta { display: flex; align-items: center; gap: 14px; }
.topbar__by {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}
@media (max-width: 620px) { .topbar__by { display: none; } }

/* ============================================================ hero */
.hero {
  position: relative;
  z-index: 1;
  min-height: calc(75svh - 54px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(32px, 5vh, 64px) 0 clamp(40px, 7vh, 80px);
}
.hero__kick {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: clamp(28px, 5vh, 52px);
}
.hero__kick .kicker { white-space: nowrap; flex: none; }
.hero__kick .rule {
  flex: 1;
  height: 1px;
  background: var(--line);
}

.diff { position: relative; }

/* Shared diff layout: marker lives in its own gutter column, text beside it.
   No absolute positioning → never drifts or collides at any width / line count. */
.hero__old, .hero__new, .law__old, .law__new {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
}
.hero__old .line, .hero__new .line,
.law__old .line, .law__new .line { min-width: 0; }

/* struck-out original line (hero) */
.old {
  font-family: var(--sans2);
  color: var(--minus);
  font-weight: 400;
}
.old .sig { color: var(--minus); opacity: 0.7; }
.old .line {
  width: max-content;
  max-width: 100%;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 58%;
  background-size: 0% 0.08em;
  transition: background-size 0.7s cubic-bezier(0.65, 0, 0.35, 1);
}
.in .old .line { background-size: 100% 0.08em; }

.hero__old {
  column-gap: 0.45em;
  font-size: clamp(1rem, 2.4vw, 1.5rem);
  margin: 0 0 0.5em;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.in .hero__old { opacity: 0.85; transform: none; }

/* rectified law — the big Bodoni moment */
.hero__new {
  font-family: var(--serif);
  font-variation-settings: "opsz" 20;
  font-weight: 500;
  font-size: clamp(2.1rem, 6.5vw, 5.05rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  margin: 0;
  column-gap: 0.34em;
  color: var(--ink);
  clip-path: inset(-0.1em 102% -0.22em 0);
  transition: clip-path 1.1s cubic-bezier(0.16, 1, 0.3, 1) 0.45s;
}
.hero__new em {
  font-style: italic;
  color: var(--sun-deep);
}
.in .hero__new { clip-path: inset(-0.1em -2% -0.22em 0); }

.hero__new .sig {
  font-family: var(--mono);
  font-style: normal;
  font-weight: 500;
  font-size: 0.3em;
  color: var(--plus);
  align-self: start;
  transform: translateY(0.5em);
}

.caret {
  display: inline-block;
  width: 0.06em;
  min-width: 3px;
  height: 0.82em;
  background: var(--sun-deep);
  margin-left: 0.08em;
  vertical-align: -0.04em;
  opacity: 0;
}
.in .caret {
  animation: blink 0.9s steps(1) 1.5s 4, fadeCaret 0.2s linear 5.1s forwards;
}
@keyframes blink { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }
@keyframes fadeCaret { to { opacity: 0; } }

.hero__byline {
  margin: clamp(28px, 5vh, 48px) 0 0;
  font-size: 1.02rem;
  color: var(--ink-soft);
  max-width: 46ch;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.6s ease 1.1s, transform 0.6s ease 1.1s;
}
.in .hero__byline { opacity: 1; transform: none; }
.hero__byline strong { color: var(--ink); font-weight: 600; }

/* ============================================================ pragmatist band */
.band {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-deep);
  padding: clamp(48px, 9vh, 96px) 0;
  text-align: center;
}
.band p {
  margin: 0;
  font-family: var(--serif);
  font-variation-settings: "opsz" 20;
  font-style: italic;
  font-weight: 500;
  font-size: clamp(1.8rem, 5vw, 3.4rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
}
.band .dot { color: var(--sun-deep); }
.band .sub {
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 1.4em;
}

/* ============================================================ corollaries */
.corollaries {
  position: relative;
  z-index: 1;
  padding: clamp(64px, 11vh, 128px) 0 clamp(40px, 7vh, 80px);
}
.sec-head { margin-bottom: clamp(40px, 7vh, 72px); }
.sec-head h2 {
  font-family: var(--serif);
  font-variation-settings: "opsz" 20;
  font-weight: 500;
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  letter-spacing: -0.01em;
  margin: 0.4em 0 0;
}
.sec-head h2 em { font-style: italic; color: var(--sun-deep); }
.sec-head .note {
  margin: 0.7em 0 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

.laws { display: flex; flex-direction: column; gap: clamp(16px, 2.6vh, 26px); }

.law {
  position: relative;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: clamp(14px, 2.4vw, 28px);
  align-items: start;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: clamp(20px, 3vw, 32px) clamp(20px, 3vw, 36px);
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.3s ease, box-shadow 0.3s ease;
}
.law.in { opacity: 1; transform: none; }
.law:hover {
  border-color: color-mix(in oklch, var(--sun) 45%, var(--line));
  box-shadow: 0 14px 40px -28px oklch(0.55 0.12 60 / 0.8);
}

.law__num {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--sun-deep);
  padding-top: 0.25em;
  letter-spacing: 0.02em;
}

.law__diff { min-width: 0; }
.law__old {
  column-gap: 0.5em;
  font-family: var(--sans2);
  font-size: clamp(0.92rem, 1.9vw, 1.05rem);
  color: var(--minus);
  margin: 0 0 0.6em;
}
.law__old .line {
  width: max-content;
  max-width: 100%;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 56%;
  background-size: 0% 0.07em;
  transition: background-size 0.65s cubic-bezier(0.65, 0, 0.35, 1) 0.15s;
}
.law.in .law__old .line { background-size: 100% 0.07em; }

.law__new {
  column-gap: 0.5em;
  font-family: var(--sans);
  font-weight: 450;
  font-size: clamp(1.18rem, 2.9vw, 1.7rem);
  line-height: 1.28;
  color: var(--ink);
  margin: 0;
  clip-path: inset(-0.05em 102% -0.18em 0);
  transition: clip-path 0.85s cubic-bezier(0.16, 1, 0.3, 1) 0.55s;
}
.law.in .law__new { clip-path: inset(-0.05em -2% -0.18em 0); }
.law__new em {
  font-family: var(--sans);
  font-style: normal;
  font-weight: 600;
  color: var(--sun-deep);
}

.sig {
  font-family: var(--mono);
  font-weight: 500;
}
.law__old .sig { color: var(--minus); font-size: 0.82em; }
.law__new .sig {
  color: var(--plus);
  font-size: 0.6em;
  align-self: start;
  transform: translateY(0.42em);
}

.law__caret {
  display: inline-block;
  width: 2px;
  height: 0.9em;
  background: var(--sun-deep);
  margin-left: 0.1em;
  vertical-align: -0.06em;
  opacity: 0;
}
.law.in .law__caret {
  animation: blink 0.85s steps(1) 1.3s 3, fadeCaret 0.2s linear 4s forwards;
}

/* ============================================================ changelog */
.changelog {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  background: var(--bg-deep);
  padding: clamp(56px, 10vh, 112px) 0;
}
.changelog .sec-head { margin-bottom: clamp(32px, 5vh, 56px); }
.clog {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.clog__row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: clamp(16px, 3vw, 40px);
  align-items: baseline;
  padding: clamp(16px, 2.6vh, 24px) 0;
  border-top: 1px solid var(--line);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.clog__row:last-child { border-bottom: 1px solid var(--line); }
.clog.in .clog__row { opacity: 1; transform: none; }
.clog.in .clog__row:nth-child(2) { transition-delay: 0.08s; }
.clog.in .clog__row:nth-child(3) { transition-delay: 0.16s; }
.clog.in .clog__row:nth-child(4) { transition-delay: 0.24s; }
.clog.in .clog__row:nth-child(5) { transition-delay: 0.32s; }
.clog__ver { padding-top: 0.1em; }
.clog__body { font-size: 1.02rem; color: var(--ink-soft); }
.clog__body strong { color: var(--ink); font-weight: 600; }

/* ============================================================ footer */
.foot {
  position: relative;
  z-index: 1;
  padding: clamp(40px, 7vh, 72px) 0 clamp(56px, 9vh, 96px);
  text-align: center;
}
.foot__law {
  font-family: var(--serif);
  font-variation-settings: "opsz" 10;
  font-style: italic;
  font-size: clamp(1.3rem, 3.4vw, 2.1rem);
  margin: 0 0 1.4em;
  letter-spacing: -0.01em;
}
.foot__law em { color: var(--sun-deep); }
.foot__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}
.foot__meta .dom { color: var(--sun-deep); }
.foot__meta .sep { color: var(--line); }

/* ============================================================ responsive */
@media (max-width: 760px) {
  .laws { gap: clamp(12px, 2vw, 20px); }
}

@media (max-width: 640px) {
  body { font-size: 17px; }

  .topbar { padding: 13px var(--gutter); }

  /* hero */
  .hero { min-height: calc(74svh - 50px); }
  .hero__kick { margin-bottom: clamp(22px, 4vh, 36px); }
  .hero__old { font-size: 0.95rem; }
  .hero__new { font-size: clamp(1.95rem, 9vw, 2.7rem); line-height: 1.08; }
  .hero__byline { font-size: 0.97rem; max-width: none; }

  /* pragmatist band */
  .band p { font-size: clamp(1.7rem, 7.4vw, 2.4rem); }

  /* corollaries — stack number above the diff; markers keep their gutter */
  .law { grid-template-columns: 1fr; gap: 6px; padding: 22px; }
  .law__num { padding-top: 0; font-size: 0.82rem; }
  .law__new { font-size: clamp(1.12rem, 5.2vw, 1.45rem); line-height: 1.32; }

  /* Let struck originals wrap inside the card instead of overflowing.
     The animated background-strike only spans one line, so on narrow
     screens swap to a native line-through that strikes every wrapped line. */
  .law__old .line,
  .hero__old .line {
    width: auto;
    max-width: 100%;
    background-image: none;
    text-decoration: line-through;
    text-decoration-color: currentColor;
    text-decoration-thickness: 0.07em;
  }

  /* changelog */
  .clog__row { grid-template-columns: 1fr; gap: 6px; }
  .clog__ver { justify-self: start; }  /* pill hugs its content, not full-width */
  .clog__body { font-size: 0.97rem; }

  /* footer — one item per line, drop the slashes */
  .foot__law { font-size: clamp(1.4rem, 6.4vw, 1.9rem); }
  .foot__meta { flex-direction: column; gap: 8px; }
  .foot__meta .sep { display: none; }
}

@media (max-width: 380px) {
  :root { --gutter: 18px; }
  .hero__new { font-size: clamp(1.7rem, 8.4vw, 2.1rem); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  .old .line, .law__old .line { background-size: 100% 0.07em; }
  .hero__new, .law__new { clip-path: none; }
  .hero__old, .hero__byline, .law, .clog__row { opacity: 1; transform: none; }
  .caret, .law__caret { display: none; }
}

/* ---- No-JS / failed-JS fallback: never leave content permanently hidden ---- */
html:not(.js) .hero__old,
html:not(.js) .hero__byline,
html:not(.js) .law,
html:not(.js) .clog__row { opacity: 1; transform: none; }
html:not(.js) .hero__new,
html:not(.js) .law__new { clip-path: none; }
html:not(.js) .old .line,
html:not(.js) .law__old .line { background-size: 100% 0.07em; }
html:not(.js) .caret,
html:not(.js) .law__caret { display: none; }