/* Drum Trace — Barograph Drum Editorial
   Chart paper / navy ink / recording scarlet / brass / storm grid */

:root {
  color-scheme: light;

  --paper: #E4DFD2;
  --paper-2: #F0EBE0;
  --ink: #0B1F33;
  --ink-2: #243648;
  --ink-3: #5A6A78;
  --trace: #C43B5A;
  --brass: #A67C3D;
  --brass-2: #C9A35E;
  --grid: #B8B0A0;
  --storm: #2A3340;
  --line: #9A9284;

  --display: "Oxanium", "Segoe UI", sans-serif;
  --text: "Gentium Plus", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", "Consolas", monospace;

  --shell: 70rem;
  --gutter: clamp(1.1rem, 4vw, 2.75rem);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent 0, transparent calc(100% - 1px), rgba(184, 176, 160, 0.45) 0) 0 0 / 1.15rem 100%,
    linear-gradient(rgba(184, 176, 160, 0.35) 1px, transparent 1px) 0 0 / 100% 1.15rem,
    var(--paper);
  font-family: var(--text);
  font-size: 1.125rem;
  line-height: 1.65;
}

img { max-width: 100%; height: auto; }
a { color: var(--ink); text-underline-offset: 0.18em; }
a:hover { color: var(--trace); }
a:focus-visible {
  outline: 2px solid var(--trace);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: var(--gutter);
  top: 0.75rem;
  z-index: 20;
  background: var(--paper-2);
  padding: 0.5rem 0.75rem;
}

.shell {
  width: min(100% - 2 * var(--gutter), var(--shell));
  margin-inline: auto;
}

.mast {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper-2) 92%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.mast__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.5rem;
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.95rem;
}
.wordmark__mark {
  width: 1.35rem;
  height: 1.35rem;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 50%, transparent 42%, var(--brass) 43% 48%, transparent 49%),
    conic-gradient(from 210deg, var(--trace) 0 18%, transparent 18% 100%);
  box-shadow: inset 0 0 0 1px var(--brass-2);
}
.nav {
  display: flex;
  gap: 1.1rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.nav a { text-decoration: none; color: var(--ink-2); }
.nav a[aria-current="page"],
.nav a:hover { color: var(--trace); }

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(3rem, 9vw, 6.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(ellipse 80% 60% at 78% 40%, rgba(196, 59, 90, 0.12), transparent 55%),
    linear-gradient(180deg, var(--paper-2), var(--paper));
}
.hero__drum {
  position: absolute;
  inset: auto -8% 8% auto;
  width: min(42vw, 22rem);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 10px solid var(--storm);
  background:
    repeating-conic-gradient(from 0deg, var(--paper-2) 0 8deg, #d9d2c3 8deg 16deg);
  box-shadow:
    inset 0 0 0 2px var(--brass),
    inset 0 0 0 14px color-mix(in srgb, var(--storm) 35%, transparent),
    0 18px 40px rgba(11, 31, 51, 0.18);
  animation: drum-spin 48s linear infinite;
  opacity: 0.9;
}
.hero__drum::after {
  content: "";
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  border: 1px dashed var(--grid);
  background:
    radial-gradient(circle at 50% 50%, transparent 58%, rgba(11, 31, 51, 0.08) 59%);
}
.hero__trace {
  position: absolute;
  left: 0;
  right: 0;
  top: 42%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--trace) 12%, var(--trace) 78%, transparent);
  transform-origin: left center;
  animation: trace-pulse 5.5s ease-in-out infinite;
  pointer-events: none;
}
.hero__trace::before {
  content: "";
  position: absolute;
  left: 12%;
  top: -7px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--trace);
  box-shadow: 0 0 0 3px rgba(196, 59, 90, 0.25);
}
@keyframes drum-spin {
  to { transform: rotate(360deg); }
}
@keyframes trace-pulse {
  0%, 100% { opacity: 0.55; transform: scaleX(0.92); }
  50% { opacity: 1; transform: scaleX(1); }
}
.hero__content { position: relative; z-index: 1; max-width: 40rem; }
.hero__brand {
  margin: 0 0 0.85rem;
  font-family: var(--display);
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--ink);
}
.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--text);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  line-height: 1.25;
  max-width: 34ch;
}
.hero__stand {
  margin: 0 0 1.25rem;
  color: var(--ink-2);
  max-width: 42ch;
}
.hero__stamp {
  display: inline-flex;
  gap: 0.75rem;
  margin: 0;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--brass);
  color: var(--storm);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: color-mix(in srgb, var(--paper-2) 80%, white);
}

.panel {
  padding: clamp(2.4rem, 6vw, 4rem) 0;
  border-bottom: 1px solid var(--line);
}
.panel--drum {
  background: color-mix(in srgb, var(--paper-2) 70%, transparent);
}
.eyebrow {
  margin: 0 0 0.4rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brass);
}
.panel h2 {
  margin: 0 0 1rem;
  font-family: var(--display);
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.lede p { margin: 0 0 0.85rem; max-width: 62ch; color: var(--ink-2); }

.library { display: grid; gap: 1rem; }
.entry {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem 1.25rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, transparent 0 70%, rgba(196, 59, 90, 0.08) 70% 72%, transparent 72%),
    var(--paper-2);
  box-shadow: inset 3px 0 0 var(--trace);
}
.entry__id {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.entry h3 {
  margin: 0 0 0.35rem;
  font-family: var(--display);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.3;
}
.entry h3 a { text-decoration: none; }
.entry h3 a:hover { text-decoration: underline; color: var(--trace); }
.entry p { margin: 0; color: var(--ink-2); font-size: 1rem; }

.standards {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.85rem;
}
.standards li {
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--brass);
  background: var(--paper-2);
}
.standards strong { font-family: var(--display); font-weight: 600; }

.not-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--ink-2);
}
.not-list li { margin-bottom: 0.45rem; }

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 0.85rem 0;
}
.faq summary {
  cursor: pointer;
  font-family: var(--display);
  font-weight: 600;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "▸ ";
  color: var(--trace);
  font-family: var(--mono);
}
.faq details[open] summary::before { content: "▾ "; }
.faq p { margin: 0.55rem 0 0; color: var(--ink-2); max-width: 62ch; }

.support-box {
  padding: 1rem 1.15rem;
  border: 1px dashed var(--brass);
  background: var(--paper-2);
}
.support-box a { font-family: var(--mono); font-size: 0.95rem; }

.article__head {
  padding: clamp(2.5rem, 7vw, 4rem) 0 1rem;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--paper-2), transparent);
}
.article__meta {
  margin: 0.75rem 0 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}
.prose { max-width: 42rem; }
.prose h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1.2;
}
.prose h2 {
  margin: 1.75rem 0 0.65rem;
  font-family: var(--display);
  font-size: 1.25rem;
}
.prose p, .prose li { color: var(--ink-2); }
.prose ul { padding-left: 1.2rem; }
.backlink {
  display: inline-block;
  margin-top: 1.5rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-bottom: 1px solid var(--trace);
}

.colophon {
  padding: 1.75rem 0 2.5rem;
  background: var(--storm);
  color: #D8DEE5;
}
.colophon a { color: #F0EBE0; }
.colophon a:hover { color: var(--brass-2); }
.colophon__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.15rem;
  margin-bottom: 0.85rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.colophon__note {
  margin: 0;
  font-size: 0.92rem;
  color: #A8B3BF;
}

@media (max-width: 720px) {
  .hero__drum { width: 11rem; opacity: 0.55; inset: auto -1.5rem 12% auto; }
  .entry { grid-template-columns: 1fr; }
  .nav { gap: 0.75rem; font-size: 0.7rem; }
}