/* =========================================================================
   PROMPT MAGIC · Il Codex dei Protocolli
   Design system — Editorial × Terminal
   Palette: paper (avorio) / ink / cinabro (rosso pompeiano)
   Type:    Fraunces (display) · Newsreader (body) · JetBrains Mono (code)
   ========================================================================= */

:root {
  --paper:        #f4efe4;
  --paper-2:      #ebe4d4;
  --paper-3:      #ddd3bd;
  --ink:          #1a1613;
  --ink-soft:     #3d332b;
  --ink-muted:    #7a6d5f;
  --rule:         rgba(26, 22, 19, 0.14);
  --rule-strong:  rgba(26, 22, 19, 0.55);
  --accent:       #c2412a;   /* cinabro / rosso pompeiano */
  --accent-deep:  #8e2c1a;
  --accent-wash:  rgba(194, 65, 42, 0.10);
  --terminal-bg:  #17130f;
  --terminal-fg:  #f0e7d4;
  --terminal-mut: #8a7a64;
  --success:      #2f6b3e;

  --f-display: "Fraunces", "Times New Roman", serif;
  --f-body:    "Newsreader", Georgia, serif;
  --f-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Consolas, monospace;

  --maxw: 1180px;
  --gutter: clamp(1.2rem, 4vw, 3rem);

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: clamp(16px, 1.05vw + 0.6rem, 18px);
  line-height: 1.55;
  font-feature-settings: "ss01", "onum";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Subtle paper texture via layered gradients (no image, pure CSS) */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(1200px 800px at 10% -10%, rgba(194,65,42,0.05), transparent 60%),
    radial-gradient(900px 700px at 110% 110%, rgba(26,22,19,0.04), transparent 65%);
}

/* Film-grain overlay (pure CSS — repeating gradient noise) */
body::after {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.35;
  mix-blend-mode: multiply;
  background-image:
    repeating-radial-gradient(circle at 30% 20%, rgba(26,22,19,0.018) 0 0.5px, transparent 0.5px 2px),
    repeating-radial-gradient(circle at 70% 60%, rgba(26,22,19,0.022) 0 0.5px, transparent 0.5px 2.5px);
}

main, header, footer, nav, section, article { position: relative; z-index: 2; }

a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; display: block; }
button { font: inherit; color: inherit; cursor: pointer; }
input, textarea, select, button { font-family: inherit; }

/* Focus ring */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Selection */
::selection { background: var(--accent); color: var(--paper); }

/* Skip link */
.skip {
  position: absolute; left: -9999px; top: auto;
  background: var(--ink); color: var(--paper);
  padding: 0.6rem 1rem; font-family: var(--f-mono); font-size: 0.8rem;
  z-index: 100;
}
.skip:focus { left: 1rem; top: 1rem; }

/* ---------- Layout shell ---------- */
.shell { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- Masthead / Nav ---------- */
.masthead {
  padding-top: clamp(1.2rem, 2.5vw, 2rem);
}
.masthead-row {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--ink);
}
.wordmark {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 1.2vw + 1rem, 1.65rem);
  letter-spacing: -0.01em;
  font-variation-settings: "opsz" 48, "SOFT" 30;
}
.wordmark .dot { color: var(--accent); }
.wordmark sup {
  font-family: var(--f-mono);
  font-size: 0.55em; font-weight: 500;
  letter-spacing: 0.1em;
  vertical-align: super;
  color: var(--ink-muted);
  margin-left: 0.15em;
}
.meta-line {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: flex; gap: 1.2rem; flex-wrap: wrap;
}
.meta-line .sep { color: var(--rule-strong); }

/* Primary nav (below masthead) */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--f-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.nav-list { display: flex; gap: clamp(0.7rem, 2vw, 1.6rem); flex-wrap: wrap; list-style: none; margin: 0; padding: 0; }
.nav-list a {
  position: relative;
  padding: 0.15em 0;
  color: var(--ink-soft);
  transition: color 0.2s var(--ease);
}
.nav-list a:hover { color: var(--accent); }
.nav-list a[aria-current="page"] {
  color: var(--ink);
  border-bottom: 1.5px solid var(--accent);
}
.nav-brand { font-family: var(--f-display); text-transform: none; letter-spacing: -0.005em; font-size: 1.05rem; font-weight: 600; }

/* ---------- Hero (home) ---------- */
.hero {
  padding: clamp(3rem, 7vw, 6rem) 0 clamp(2rem, 5vw, 4rem);
  border-bottom: 1px solid var(--ink);
}
.hero-kicker {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex; align-items: center; gap: 0.7rem;
  margin-bottom: 1.5rem;
}
.hero-kicker::before {
  content: ""; display: inline-block;
  width: 28px; height: 1px; background: var(--accent);
}
.hero-title {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(2.6rem, 7vw + 0.5rem, 6.2rem);
  line-height: 0.95;
  letter-spacing: -0.035em;
  margin: 0 0 1.4rem;
  font-variation-settings: "opsz" 144, "SOFT" 30;
  max-width: 14ch;
}
.hero-title em {
  font-style: italic;
  color: var(--accent);
  font-variation-settings: "opsz" 144, "SOFT" 100;
}
.hero-lede {
  font-family: var(--f-body);
  font-size: clamp(1.1rem, 0.6vw + 1rem, 1.35rem);
  max-width: 52ch;
  color: var(--ink-soft);
  line-height: 1.55;
  margin: 0 0 1.8rem;
}
.hero-lede strong { color: var(--ink); font-weight: 600; }
.hero-meta {
  display: flex; gap: 2rem; flex-wrap: wrap;
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.hero-meta span strong { color: var(--ink); font-weight: 600; display: block; font-size: 1.6em; letter-spacing: -0.02em; margin-bottom: 0.2em; font-family: var(--f-display); }

/* ---------- Codex / TOC (home) ---------- */
.codex {
  padding: clamp(2.5rem, 5vw, 4.5rem) 0;
  border-bottom: 1px solid var(--ink);
}
.section-label {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: flex; align-items: center; gap: 0.8rem;
  margin-bottom: 2rem;
}
.section-label::before {
  content: ""; width: 36px; height: 1px; background: var(--ink-muted);
}

.codex-list { list-style: none; margin: 0; padding: 0; }
.codex-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: center;
  padding: clamp(1.4rem, 3vw, 2.2rem) 0;
  border-top: 1px solid var(--rule);
  transition: background 0.35s var(--ease), padding 0.35s var(--ease);
}
.codex-item:last-child { border-bottom: 1px solid var(--rule); }
.codex-item a {
  display: contents;
}
.codex-item:hover {
  background: var(--paper-2);
  padding-left: 0.8rem;
  padding-right: 0.8rem;
}
.codex-item .roman {
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(2.5rem, 5vw, 4.2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-variation-settings: "opsz" 144, "SOFT" 30;
  width: clamp(3rem, 6vw, 5rem);
  transition: color 0.3s var(--ease), transform 0.4s var(--ease);
}
.codex-item:hover .roman { color: var(--accent); transform: translateX(2px); }
.codex-item .body h2 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(1.4rem, 1.5vw + 0.9rem, 2.1rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.35rem;
  line-height: 1.1;
  font-variation-settings: "opsz" 72, "SOFT" 30;
}
.codex-item .body .tag {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.4rem;
  display: block;
}
.codex-item .body p {
  margin: 0; color: var(--ink-soft);
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.5;
}
.codex-item .arrow {
  font-family: var(--f-mono);
  font-size: 1.4rem;
  color: var(--ink-muted);
  transition: transform 0.35s var(--ease), color 0.3s var(--ease);
}
.codex-item:hover .arrow { transform: translateX(8px); color: var(--accent); }

/* ---------- Editor's note ---------- */
.editor-note {
  padding: clamp(3rem, 6vw, 5.5rem) 0;
  border-bottom: 1px solid var(--ink);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
}
.editor-note .side h3 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(1.8rem, 2.5vw + 1rem, 3rem);
  line-height: 1.0;
  letter-spacing: -0.025em;
  margin: 0.5rem 0 0;
  font-variation-settings: "opsz" 144, "SOFT" 40;
  font-style: italic;
}
.editor-note .body p {
  margin: 0 0 1.1rem;
  color: var(--ink-soft);
  font-size: 1.08rem;
  line-height: 1.7;
}
.editor-note .body p:first-of-type::first-letter {
  font-family: var(--f-display);
  font-size: 5.2em;
  float: left;
  line-height: 0.85;
  padding: 0.05em 0.1em 0 0;
  color: var(--accent);
  font-weight: 500;
  font-variation-settings: "opsz" 144, "SOFT" 30;
}
.editor-note .signature {
  font-family: var(--f-body); font-style: italic;
  color: var(--ink-muted); margin-top: 1.5rem;
  font-size: 0.95rem;
}

/* Principles grid */
.principles {
  padding: clamp(2.5rem, 5vw, 4.5rem) 0;
  border-bottom: 1px solid var(--ink);
}
.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
  margin-top: 2rem;
}
.principle {
  border-top: 1px solid var(--ink);
  padding-top: 1rem;
}
.principle .num {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 0.4rem;
}
.principle h4 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 1.3rem;
  letter-spacing: -0.015em;
  margin: 0 0 0.5rem;
  line-height: 1.15;
}
.principle p { margin: 0; color: var(--ink-soft); font-size: 0.98rem; line-height: 1.55; }

/* ---------- Colophon / Footer ---------- */
.colophon {
  padding: clamp(2.5rem, 5vw, 4rem) 0 clamp(1.5rem, 3vw, 2.5rem);
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
}
.colophon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem 2.5rem;
  margin-bottom: 2.5rem;
}
.colophon h5 {
  font-family: var(--f-display);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--ink);
  margin: 0 0 0.7rem;
  text-transform: none;
}
.colophon ul { list-style: none; margin: 0; padding: 0; }
.colophon li { margin-bottom: 0.35rem; }
.colophon a { border-bottom: 1px solid transparent; transition: border-color 0.2s var(--ease), color 0.2s var(--ease); }
.colophon a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.colophon-bottom {
  display: flex; justify-content: space-between; align-items: baseline;
  padding-top: 1.2rem; border-top: 1px solid var(--rule);
  flex-wrap: wrap; gap: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.68rem;
}

/* =========================================================================
   LAB PAGES (capitoli)
   ========================================================================= */

.chapter-head {
  padding: clamp(2.5rem, 5vw, 4.5rem) 0 clamp(2rem, 3vw, 3rem);
  border-bottom: 1px solid var(--ink);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(1.2rem, 3vw, 2.5rem);
  align-items: end;
}
.chapter-numeral {
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(5rem, 12vw, 11rem);
  line-height: 0.82;
  letter-spacing: -0.04em;
  color: var(--accent);
  font-variation-settings: "opsz" 144, "SOFT" 30;
  margin: 0;
  font-style: italic;
}
.chapter-meta .kicker {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 0.8rem;
}
.chapter-meta h1 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(2.2rem, 4vw + 0.5rem, 4rem);
  letter-spacing: -0.028em;
  line-height: 1;
  margin: 0 0 0.8rem;
  font-variation-settings: "opsz" 144, "SOFT" 30;
}
.chapter-meta .subtitle {
  font-family: var(--f-body);
  font-style: italic;
  font-size: clamp(1.1rem, 1vw + 0.8rem, 1.3rem);
  color: var(--ink-soft);
  max-width: 50ch;
  margin: 0 0 0.8rem;
  line-height: 1.45;
}
.chapter-meta .count {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ---------- Toolbar (search/filter) ---------- */
.toolbar {
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--rule);
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
}
.search {
  flex: 1 1 280px;
  display: flex; align-items: center; gap: 0.6rem;
  border: 1px solid var(--rule-strong);
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  background: transparent;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.search:focus-within {
  border-color: var(--accent);
  background: var(--paper-2);
}
.search svg { width: 16px; height: 16px; stroke: var(--ink-muted); flex-shrink: 0; }
.search input {
  flex: 1; background: transparent; border: 0; outline: 0;
  font-family: var(--f-body);
  font-size: 1rem;
  color: var(--ink);
}
.search input::placeholder { color: var(--ink-muted); font-style: italic; }
.kbd {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  padding: 0.15em 0.4em;
  background: var(--paper-2);
  border: 1px solid var(--rule-strong);
  border-bottom-width: 2px;
  border-radius: 3px;
  color: var(--ink-muted);
  white-space: nowrap;
}
.toolbar .hint {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

/* ---------- Lab workspace: COMPOSER (singolo pannello input) ---------- */
.lab-workspace {
  padding: clamp(1.5rem, 3vw, 2.5rem) 0 0;
}

.composer {
  background: linear-gradient(180deg, var(--paper-2) 0%, transparent 100%);
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  padding: clamp(1.5rem, 3vw, 2.2rem) clamp(1.2rem, 2.5vw, 2rem);
  position: relative;
}
.composer::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 60px; height: 2px;
  background: var(--accent);
}

.composer-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: clamp(1rem, 2.5vw, 1.8rem);
  align-items: baseline;
  padding-bottom: 1.2rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px dashed var(--rule-strong);
}
.composer-num {
  font-family: var(--f-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(2.6rem, 6vw, 4rem);
  color: var(--accent);
  line-height: 0.85;
  letter-spacing: -0.03em;
  font-variation-settings: "opsz" 144, "SOFT" 100;
  min-width: 2ch;
  text-align: center;
}
.composer-meta { min-width: 0; }
.composer-tag {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.35rem;
}
.composer-title {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0;
}
.composer-progress {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  white-space: nowrap;
  align-self: start;
  padding-top: 0.4rem;
}

.composer-form {
  display: grid;
  gap: 1rem;
}
.composer-label {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}
.composer-label .req {
  color: var(--accent);
  font-style: italic;
  text-transform: none;
  letter-spacing: 0;
  font-family: var(--f-body);
  font-size: 0.85rem;
}
.composer-input {
  width: 100%;
  padding: 0.95rem 1.1rem;
  font-family: var(--f-body);
  font-size: 1.08rem;
  line-height: 1.5;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: 0;
  outline: 0;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
  resize: vertical;
  min-height: 3.2rem;
  font-family: var(--f-body);
}
.composer-input::placeholder { color: var(--ink-muted); font-style: italic; }
.composer-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-wash);
}

.composer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 0.3rem;
}
.composer-hint {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.btn-primary {
  padding: 0.8rem 1.6rem;
  font-size: 0.78rem;
}

/* ---------- Index dei protocolli ---------- */
.index-section {
  padding: clamp(2.5rem, 5vw, 4rem) 0 clamp(3rem, 6vw, 5rem);
}
.index-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  padding-bottom: 0.9rem;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 0;
}
.index-kicker {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin: 0 0 0.3rem;
}
.index-title-el {
  font-family: var(--f-display);
  font-weight: 500;
  font-style: italic;
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink);
}
.index-filter {
  flex: 0 1 320px;
  min-width: 220px;
}

.index-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}
.index-list > li {
  border-bottom: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
}
.index-list > li:nth-child(2n) { border-right: 0; }

.index-item {
  width: 100%;
  background: transparent;
  border: 0;
  padding: 1rem clamp(1rem, 2vw, 1.4rem) 1.05rem;
  display: grid;
  grid-template-columns: 2.2rem 1fr auto;
  gap: 0.8rem 1rem;
  align-items: baseline;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
  position: relative;
  transition: background 0.2s var(--ease), opacity 0.3s var(--ease);
}
.index-item[hidden] { display: none; }
.index-item:hover { background: var(--paper-2); }
.index-item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -3px;
}
.index-item[aria-checked="true"] {
  background: var(--paper-2);
}
.index-item[aria-checked="true"]::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--accent);
}
.index-item .idx-num {
  font-family: var(--f-display);
  font-style: italic;
  font-weight: 400;
  font-size: 1.15rem;
  color: var(--accent);
  line-height: 1.2;
  letter-spacing: 0;
  text-align: center;
  font-variation-settings: "SOFT" 80;
}
.index-item .idx-body { min-width: 0; }
.index-item .idx-tag {
  font-family: var(--f-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: block;
  margin-bottom: 0.2rem;
}
.index-item .idx-title {
  font-family: var(--f-body);
  font-size: 1rem;
  line-height: 1.3;
  color: var(--ink);
  display: block;
}
.index-item[aria-checked="true"] .idx-title {
  font-weight: 600;
}
.index-item .idx-mark {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--accent);
  opacity: 0;
  transition: opacity 0.2s var(--ease);
  align-self: center;
}
.index-item[aria-checked="true"] .idx-mark { opacity: 1; }

.btn {
  display: inline-flex; align-items: center; gap: 0.5em;
  padding: 0.65rem 1.1rem;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  font-family: var(--f-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.15s var(--ease);
  white-space: nowrap;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: var(--paper); }
.btn:active { transform: translateY(1px); }
.btn-ghost {
  background: transparent; color: var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

/* ---------- Protocol output (terminal) ---------- */
.output {
  margin-top: 1rem;
  background: var(--terminal-bg);
  color: var(--terminal-fg);
  border: 1px solid var(--ink);
  padding: 1rem 1.1rem 0.9rem;
  font-family: var(--f-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  position: relative;
  overflow: hidden;
  max-height: 0;
  padding-top: 0; padding-bottom: 0;
  transition: max-height 0.45s var(--ease), padding 0.3s var(--ease);
}
.output[data-open="true"] {
  max-height: 2000px;
  padding-top: 1rem; padding-bottom: 0.9rem;
}
.output-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed rgba(240,231,212,0.25);
}
.output-header .stamp {
  color: var(--terminal-mut);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.output-header .stamp::before {
  content: "●";
  color: var(--accent);
  margin-right: 0.5em;
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}
.output .text {
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--terminal-fg);
}
.output .text::after {
  content: "▊";
  color: var(--accent);
  margin-left: 0.1em;
  animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.output-footer {
  display: flex; justify-content: flex-end; gap: 0.5rem;
  margin-top: 0.8rem;
  padding-top: 0.6rem;
  border-top: 1px dashed rgba(240,231,212,0.25);
}
.btn-copy {
  padding: 0.45rem 0.9rem;
  background: transparent;
  color: var(--terminal-fg);
  border: 1px solid rgba(240,231,212,0.3);
  font-family: var(--f-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn-copy:hover { background: var(--accent); color: var(--paper); border-color: var(--accent); }
.btn-copy.copied { background: var(--success); border-color: var(--success); color: var(--paper); }

/* Toast */
.toast {
  position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%) translateY(120%);
  background: var(--ink); color: var(--paper);
  padding: 0.7rem 1.2rem;
  font-family: var(--f-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  border-radius: 2px;
  z-index: 50;
  transition: transform 0.35s var(--ease);
  box-shadow: 0 8px 24px rgba(26,22,19,0.25);
}
.toast.visible { transform: translateX(-50%) translateY(0); }
.toast::before {
  content: "✓";
  color: var(--accent);
  margin-right: 0.6em;
  font-weight: bold;
}

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal:nth-child(2) { transition-delay: 0.05s; }
.reveal:nth-child(3) { transition-delay: 0.1s; }
.reveal:nth-child(4) { transition-delay: 0.15s; }
.reveal:nth-child(5) { transition-delay: 0.2s; }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .chapter-head { grid-template-columns: 1fr; }
  .chapter-numeral { font-size: clamp(4rem, 18vw, 7rem); }
  .editor-note { grid-template-columns: 1fr; }
  .codex-item { grid-template-columns: auto 1fr; gap: 1rem; }
  .codex-item .arrow { display: none; }
  .hero-meta { gap: 1.2rem; }

  .composer-header {
    grid-template-columns: auto 1fr;
  }
  .composer-progress {
    grid-column: 1 / -1;
    padding-top: 0;
  }
  .index-list { grid-template-columns: 1fr; }
  .index-list > li { border-right: 0; }
  .index-header { gap: 0.8rem; }
  .index-filter { flex: 1 1 100%; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Print ---------- */
@media print {
  body::before, body::after { display: none; }
  .nav, .toolbar, .output-footer, footer.colophon { display: none; }
  body { background: white; color: black; }
  .output { background: #f5f5f5; color: black; border: 1px solid #ccc; }
  .output[data-open="true"] { max-height: none; }
}