/* ============================================================
   Lexi — site/css/main.css
   Editorial typography, warm paper, sage accent.
   Fraunces (Latin) + Noto Serif SC (Han) + JetBrains Mono.
   ============================================================ */

:root {
  /* Paper & ink */
  --paper:        #f5efe2;
  --paper-2:      #ede5d2;
  --paper-3:      #e6dcc4;
  --ink:          #2b2620;
  --ink-2:        #4a4238;
  --ink-3:        #7a6f5e;
  --ink-4:        #b5a994;

  /* Rules & dividers */
  --rule:         #d4c9b1;
  --rule-2:       #bfb29a;

  /* Sage accent */
  --accent:       #7d8e5a;
  --accent-deep:  #5f6e44;
  --accent-soft:  #d6dfbf;
  --accent-faint: #ebf0dd;

  /* Type stacks */
  --serif:    "Fraunces", "Iowan Old Style", "Charter", Georgia, serif;
  --serif-zh: "Noto Serif SC", "Songti SC", "STSong", "宋体", serif;
  --mono:     "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Rhythm */
  --measure:  64ch;
  --gutter:   clamp(20px, 5vw, 56px);
}

/* ============================================================
   Reset / base
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-feature-settings: "kern", "liga", "calt", "onum";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;

  /* Subtle paper grain + warm radial glow */
  background-image:
    radial-gradient(ellipse 80% 60% at 30% 0%, rgba(125, 142, 90, 0.045), transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(125, 142, 90, 0.03), transparent 60%),
    url("data:image/svg+xml,%3Csvg viewBox='0 0 240 240' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.169 0 0 0 0 0.149 0 0 0 0 0.125 0 0 0 0.035 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-attachment: fixed, fixed, fixed;
  background-size: auto, auto, 240px 240px;
}

::selection {
  background: var(--accent-soft);
  color: var(--ink);
}

a {
  color: inherit;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

img {
  max-width: 100%;
  display: block;
}

em {
  font-style: italic;
  font-feature-settings: "kern", "liga";
}

/* ============================================================
   Masthead
   ============================================================ */
.masthead {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px var(--gutter) 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
}

.wordmark {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  font-style: italic;
  font-variation-settings: "opsz" 144, "wght" 600;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1;
  transition: color 220ms;
}

.wordmark:hover {
  color: var(--accent-deep);
}

.masthead-nav {
  display: flex;
  gap: 28px;
  align-items: baseline;
  flex-wrap: wrap;
}

.masthead-nav a {
  font-family: var(--serif);
  font-size: 13.5px;
  font-variation-settings: "opsz" 14, "wght" 400;
  color: var(--ink-2);
  letter-spacing: 0.005em;
  transition: color 200ms;
  position: relative;
}

.masthead-nav a:hover {
  color: var(--accent-deep);
}

.masthead-nav a.external {
  font-style: italic;
  color: var(--ink-3);
}

.masthead-nav a.external:hover {
  color: var(--accent-deep);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  max-width: 1180px;
  margin: clamp(48px, 9vw, 120px) auto clamp(32px, 6vw, 64px);
  padding: 0 var(--gutter);
}

.display {
  font-family: var(--serif);
  font-size: clamp(56px, 11vw, 152px);
  line-height: 0.94;
  font-weight: 400;
  font-variation-settings: "opsz" 144, "wght" 400;
  letter-spacing: -0.035em;
  color: var(--ink);
  max-width: 14ch;
}

.display .line {
  display: block;
}

.display em {
  font-style: italic;
  color: var(--accent-deep);
  font-variation-settings: "opsz" 144, "wght" 400;
}

.hero-sub {
  font-family: var(--serif);
  font-size: clamp(18px, 1.7vw, 22px);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 38em;
  margin-top: clamp(28px, 4vw, 40px);
  font-variation-settings: "opsz" 24, "wght" 400;
}

.hero-gloss {
  font-family: var(--serif-zh);
  font-size: clamp(13px, 1.1vw, 15px);
  color: var(--accent-deep);
  margin-top: 16px;
  letter-spacing: 0.12em;
  font-weight: 400;
  opacity: 0.85;
}

.hero-actions {
  margin-top: clamp(36px, 5vw, 56px);
  display: flex;
  align-items: baseline;
  gap: 24px;
  flex-wrap: wrap;
}

.action.primary {
  font-family: var(--serif);
  font-size: clamp(17px, 1.5vw, 19px);
  font-weight: 500;
  font-variation-settings: "opsz" 24, "wght" 500;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
  transition: color 220ms, border-color 220ms, transform 220ms;
  display: inline-block;
}

.action.primary:hover {
  color: var(--accent-deep);
  border-color: var(--accent-deep);
  transform: translateX(2px);
}

.action-note {
  font-family: var(--serif);
  font-size: 13px;
  color: var(--ink-3);
  font-style: italic;
  font-variation-settings: "opsz" 14;
}

/* ============================================================
   Hero stage — CSS-rendered Lexi reader window
   ============================================================ */
.hero-stage {
  max-width: 1140px;
  margin: 0 auto clamp(80px, 12vw, 140px);
  padding: 0 var(--gutter);
}

.mock-window {
  --mock-paper:   #f5efe2;
  --mock-paper-2: #ede5d2;
  --mock-paper-3: #e6dcc4;
  --mock-ink:     #2b2620;
  --mock-ink-2:   #4a4238;
  --mock-ink-3:   #7a6f5e;
  --mock-ink-4:   #b5a994;
  --mock-rule:    #d4c9b1;
  --mock-rule-2:  #bfb29a;
  --mock-accent:  #7d8e5a;
  --mock-soft:    #d6dfbf;

  background: var(--mock-paper);
  border-radius: 10px;
  overflow: hidden;
  position: relative;
  isolation: isolate;
  box-shadow:
    0 0 0 1px rgba(43, 38, 32, 0.06),
    0 2px 4px rgba(43, 38, 32, 0.04),
    0 12px 36px rgba(43, 38, 32, 0.08),
    0 40px 112px rgba(43, 38, 32, 0.08);
  transition: transform 700ms cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 700ms cubic-bezier(0.16, 1, 0.3, 1);
  /* Tiny rim highlight for that macOS window feel */
  background-image: linear-gradient(180deg,
    rgba(255, 255, 255, 0.5),
    rgba(255, 255, 255, 0) 28px);
}

.hero-stage:hover .mock-window {
  transform: translateY(-4px);
  box-shadow:
    0 0 0 1px rgba(43, 38, 32, 0.07),
    0 4px 8px rgba(43, 38, 32, 0.05),
    0 20px 56px rgba(43, 38, 32, 0.10),
    0 56px 144px rgba(43, 38, 32, 0.09);
}

/* ====== Chrome ====== */
.mock-chrome {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(212, 201, 177, 0.55);
  background: linear-gradient(180deg,
    rgba(245, 239, 226, 0.95),
    rgba(245, 239, 226, 0.85));
  backdrop-filter: blur(10px);
}

.mock-lights {
  display: flex;
  gap: 7px;
  padding-right: 8px;
}

.mock-light {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: block;
  box-shadow: inset 0 0 0 0.5px rgba(0, 0, 0, 0.18);
}

.mock-light.close { background: #e8a09a; }
.mock-light.min   { background: #e8c994; }
.mock-light.max   { background: #a6b894; }

.mock-title {
  font-family: var(--serif);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--mock-ink-2);
  font-variation-settings: "opsz" 14, "wght" 500;
  text-align: center;
  letter-spacing: 0.005em;
}

.mock-toolbar {
  display: flex;
  gap: 2px;
  color: var(--mock-ink-2);
}

.mock-tb {
  width: 26px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 5px;
  color: var(--mock-ink-2);
  transition: background 200ms, color 200ms;
}

.mock-tb svg {
  width: 14px;
  height: 14px;
  display: block;
}

.mock-tb:hover {
  background: rgba(125, 142, 90, 0.10);
  color: var(--mock-accent);
}

.mock-tb.active {
  background: var(--mock-soft);
  color: var(--mock-ink);
}

/* ====== Body ====== */
.mock-body {
  display: grid;
  grid-template-columns: 200px 1fr;
  min-height: 460px;
}

/* Sidebar */
.mock-sidebar {
  background: var(--mock-paper-2);
  border-right: 1px solid var(--mock-rule);
  padding: 18px 14px;
}

.mock-book-title {
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 500;
  color: var(--mock-ink);
  font-variation-settings: "opsz" 18, "wght" 500;
  line-height: 1.25;
  padding: 0 8px;
  margin-bottom: 3px;
}

.mock-book-author {
  font-family: var(--serif);
  font-size: 11.5px;
  color: var(--mock-ink-3);
  font-style: italic;
  font-variation-settings: "opsz" 12;
  padding: 0 8px;
}

.mock-divider {
  height: 1px;
  background: var(--mock-rule);
  margin: 14px 8px 12px;
}

.mock-toc {
  display: flex;
  flex-direction: column;
}

.mock-toc-item {
  display: grid;
  grid-template-columns: 22px 1fr 10px;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  font-family: var(--serif);
  font-size: 11.5px;
  color: var(--mock-ink-2);
  border-radius: 4px;
  font-variation-settings: "opsz" 12, "wght" 400;
  margin-bottom: 1px;
}

.mock-toc-item.active {
  background: var(--mock-soft);
  color: var(--mock-ink);
  font-weight: 500;
  font-variation-settings: "opsz" 12, "wght" 500;
}

.mock-toc-num {
  font-style: italic;
  color: var(--mock-ink-3);
  text-align: right;
  font-size: 10.5px;
  letter-spacing: 0.04em;
}

.mock-toc-item.active .mock-toc-num {
  color: var(--mock-accent);
  font-weight: 500;
}

.mock-toc-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mock-toc-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--mock-ink-4);
}

.mock-toc-dot.half {
  background: var(--mock-soft);
  border-color: var(--mock-accent);
}

.mock-toc-dot.full {
  background: var(--mock-accent);
  border-color: var(--mock-accent);
  opacity: 0.85;
}

/* Reading area */
.mock-reading {
  padding: 28px 36px 24px;
  overflow: hidden;
}

.mock-chapter-meta {
  font-family: var(--serif);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mock-ink-3);
  font-weight: 500;
  font-variation-settings: "opsz" 10, "wght" 500;
  margin-bottom: 6px;
}

.mock-chapter {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--mock-ink);
  letter-spacing: -0.015em;
  font-variation-settings: "opsz" 60, "wght" 500;
  line-height: 1.2;
  margin-bottom: 18px;
}

.mock-rule {
  width: 32px;
  height: 1px;
  background: var(--mock-accent);
  opacity: 0.7;
  margin-bottom: 22px;
}

.mock-paragraph {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: start;
  margin-bottom: 20px;
}

.mock-en {
  font-family: var(--serif);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mock-ink);
  font-variation-settings: "opsz" 14, "wght" 400;
  hyphens: auto;
}

.mock-zh {
  font-family: var(--serif-zh);
  font-size: 13px;
  line-height: 1.85;
  color: var(--mock-ink-2);
  font-weight: 400;
  letter-spacing: 0.005em;
}

/* ====== Status bar ====== */
.mock-status {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 8px 16px 9px;
  border-top: 1px solid var(--mock-rule);
  background: var(--mock-paper-2);
  font-family: var(--serif);
  font-size: 11px;
  color: var(--mock-ink-3);
  font-variation-settings: "opsz" 11, "wght" 400;
  font-style: italic;
  letter-spacing: 0.02em;
}

.mock-status-right {
  text-align: right;
  font-style: normal;
  color: var(--mock-ink-2);
}

.mock-progress {
  height: 2px;
  background: var(--mock-rule);
  border-radius: 1px;
  overflow: hidden;
  position: relative;
}

.mock-progress-fill {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--mock-accent);
  border-radius: 1px;
  animation: mockProgress 2400ms cubic-bezier(0.16, 1, 0.3, 1) 1200ms both;
}

@keyframes mockProgress {
  from { width: 0%; }
  to   { width: 2%; }
}

/* ====== Caption ====== */
.hero-stage-caption {
  font-family: var(--serif);
  font-size: 12.5px;
  color: var(--ink-3);
  font-style: italic;
  text-align: center;
  margin-top: 22px;
  font-variation-settings: "opsz" 12, "wght" 400;
  letter-spacing: 0.01em;
}

.hero-stage-caption-zh {
  font-family: var(--serif-zh);
  font-style: normal;
  color: var(--accent-deep);
  margin-left: 8px;
  letter-spacing: 0.1em;
  font-size: 0.92em;
  opacity: 0.85;
}

/* ============================================================
   Prose sections
   ============================================================ */
.prose {
  max-width: 720px;
  margin: 0 auto clamp(80px, 10vw, 120px);
  padding: 0 var(--gutter);
}

.prose p {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink);
  margin-bottom: 22px;
  font-variation-settings: "opsz" 18, "wght" 400;
  hyphens: auto;
}

.prose .lead {
  font-size: clamp(18px, 1.8vw, 21px);
  line-height: 1.55;
  color: var(--ink);
  margin-bottom: 28px;
  font-variation-settings: "opsz" 24, "wght" 400;
}

.prose .aside {
  font-style: italic;
  color: var(--ink-3);
  font-size: 16px;
  line-height: 1.6;
  margin-top: 32px;
  padding-left: 20px;
  border-left: 1px solid var(--rule);
  max-width: 56ch;
}

/* ============================================================
   Section heading: § ‣ Title ‣ Chinese gloss
   ============================================================ */
.section-heading {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 16px;
  margin-bottom: clamp(28px, 4vw, 44px);
  font-family: var(--serif);
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 500;
  font-variation-settings: "opsz" 72, "wght" 500;
  letter-spacing: -0.018em;
  line-height: 1.1;
  color: var(--ink);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--rule);
}

.section-heading .mark {
  font-family: var(--serif);
  font-style: italic;
  color: var(--accent-deep);
  font-size: 0.7em;
  font-variation-settings: "opsz" 24, "wght" 400;
  opacity: 0.75;
}

.section-heading .title {
  font-variation-settings: "opsz" 72, "wght" 500;
}

.section-heading .gloss {
  font-family: var(--serif-zh);
  font-size: 0.4em;
  color: var(--ink-3);
  font-weight: 300;
  letter-spacing: 0.08em;
  text-align: right;
  align-self: center;
  white-space: nowrap;
}

/* ============================================================
   Drop cap
   ============================================================ */
.dropcap {
  float: left;
  font-family: var(--serif);
  font-size: 5.4em;
  line-height: 0.82;
  font-style: italic;
  font-weight: 500;
  font-variation-settings: "opsz" 144, "wght" 500;
  color: var(--accent-deep);
  padding: 0.08em 0.10em 0 0;
  shape-outside: margin-box;
}

/* ============================================================
   Pull quote
   ============================================================ */
.pullquote {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.3;
  color: var(--ink);
  font-variation-settings: "opsz" 60, "wght" 400;
  margin: clamp(40px, 6vw, 64px) auto;
  padding: 0 0 0 28px;
  border-left: 3px solid var(--accent);
  max-width: 28ch;
  letter-spacing: -0.005em;
}

.pullquote-zh {
  display: block;
  font-family: var(--serif-zh);
  font-style: normal;
  font-size: 0.5em;
  color: var(--ink-3);
  font-weight: 300;
  letter-spacing: 0.06em;
  margin-top: 12px;
  line-height: 1.5;
}

/* ============================================================
   Reading demo (the centrepiece)
   ============================================================ */
.reading-demo {
  position: relative;
  margin: clamp(32px, 5vw, 48px) calc(var(--gutter) * -0.5);
  padding: clamp(28px, 4vw, 44px) clamp(28px, 4vw, 44px);
  background: linear-gradient(180deg, var(--paper-2), var(--paper));
  border-radius: 4px;
  box-shadow:
    inset 0 0 0 1px rgba(125, 142, 90, 0.08),
    0 1px 0 rgba(43, 38, 32, 0.04),
    0 12px 36px rgba(43, 38, 32, 0.05);
}

.reading-demo-rule {
  position: absolute;
  left: 0;
  top: 12%;
  bottom: 12%;
  width: 3px;
  background: var(--accent);
  border-radius: 0 2px 2px 0;
  opacity: 0.85;
}

.reading-demo-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 4vw, 44px);
  align-items: start;
}

.reading-demo .en {
  font-family: var(--serif);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.72;
  color: var(--ink);
  font-variation-settings: "opsz" 18, "wght" 400;
  hyphens: auto;
}

.reading-demo .zh {
  font-family: var(--serif-zh);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--ink-2);
  font-weight: 400;
  letter-spacing: 0.005em;
}

.reading-demo-caption {
  margin-top: clamp(20px, 3vw, 28px);
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  text-align: right;
  font-family: var(--serif);
  font-size: 13px;
  font-style: italic;
  color: var(--ink-3);
  font-variation-settings: "opsz" 14;
}

.reading-demo-caption em {
  color: var(--ink-2);
  font-style: italic;
}

/* ============================================================
   Surfaces (what's inside · 3 sub-blocks)
   ============================================================ */
.surface {
  margin-bottom: clamp(40px, 5vw, 56px);
  position: relative;
}

.surface:last-child {
  margin-bottom: 0;
}

.surface-label {
  font-family: var(--serif);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-deep);
  margin-bottom: 12px;
  font-weight: 500;
  font-variation-settings: "opsz" 14, "wght" 500;
  font-style: italic;
}

.surface-title {
  font-family: var(--serif);
  font-size: clamp(22px, 2.2vw, 26px);
  font-weight: 500;
  font-variation-settings: "opsz" 36, "wght" 500;
  line-height: 1.28;
  letter-spacing: -0.012em;
  margin-bottom: 14px;
  color: var(--ink);
}

.surface p {
  font-size: 16.5px;
  line-height: 1.68;
  color: var(--ink-2);
  margin-bottom: 0;
  font-variation-settings: "opsz" 18, "wght" 400;
}

/* ============================================================
   Inline atoms
   ============================================================ */
kbd {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78em;
  padding: 1px 6px;
  margin: 0 1px;
  background: var(--paper);
  border: 1px solid var(--rule-2);
  border-bottom-width: 2px;
  border-radius: 4px;
  color: var(--ink);
  vertical-align: 1.5px;
  letter-spacing: 0;
  line-height: 1.4;
}

.code {
  font-family: var(--mono);
  font-size: 0.82em;
  padding: 1px 5px;
  background: var(--paper-2);
  border-radius: 3px;
  color: var(--ink-2);
}

/* ============================================================
   Colophon
   ============================================================ */
.colophon p {
  font-family: var(--serif);
  font-size: 15px;
  font-style: italic;
  color: var(--ink-3);
  line-height: 1.72;
  margin-bottom: 18px;
  font-variation-settings: "opsz" 14, "wght" 400;
}

.colophon em {
  font-style: italic;
  color: var(--ink-2);
  font-weight: 500;
}

.colophon .requirements {
  font-style: normal;
  font-size: 13px;
  color: var(--ink-4);
  letter-spacing: 0.04em;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}

.colophon a {
  color: var(--ink-2);
  border-bottom: 1px solid var(--rule-2);
  transition: color 220ms, border-color 220ms;
}

.colophon a:hover {
  color: var(--accent-deep);
  border-color: var(--accent-deep);
}

/* ============================================================
   Footer
   ============================================================ */
footer {
  margin-top: clamp(80px, 10vw, 120px);
  padding-bottom: clamp(40px, 5vw, 64px);
}

.footer-rule {
  max-width: 1180px;
  margin: 0 auto 32px;
  padding: 0 var(--gutter);
  height: 1px;
  background: var(--rule);
  position: relative;
}

.footer-rule::before {
  content: "✦";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -55%);
  background: var(--paper);
  padding: 0 16px;
  color: var(--accent);
  font-family: var(--serif);
  font-size: 14px;
  font-style: italic;
}

.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-mark {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.footer-wordmark {
  font-family: var(--serif);
  font-size: 16px;
  font-style: italic;
  font-weight: 500;
  font-variation-settings: "opsz" 60, "wght" 500;
  color: var(--ink-2);
}

.footer-copy {
  font-family: var(--serif);
  font-size: 12.5px;
  color: var(--ink-3);
  font-style: italic;
  font-variation-settings: "opsz" 12;
}

.footer-nav {
  display: flex;
  gap: 24px;
}

.footer-nav a {
  font-family: var(--serif);
  font-size: 12.5px;
  color: var(--ink-3);
  font-variation-settings: "opsz" 12, "wght" 400;
  transition: color 220ms;
  font-style: italic;
}

.footer-nav a:hover {
  color: var(--accent-deep);
}

/* ============================================================
   Responsive — dual column collapses on mobile
   ============================================================ */
@media (max-width: 860px) {
  .mock-body {
    grid-template-columns: 1fr;
    min-height: 0;
  }
  .mock-sidebar {
    display: none;
  }
  .mock-reading {
    padding: 24px 28px 20px;
  }
}

@media (max-width: 720px) {
  .reading-demo {
    margin-left: 0;
    margin-right: 0;
  }

  .reading-demo-rule {
    top: 0;
    bottom: auto;
    left: 0;
    right: 0;
    width: 100%;
    height: 3px;
    border-radius: 2px 2px 0 0;
  }

  .reading-demo-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .reading-demo .en {
    padding-bottom: 24px;
    border-bottom: 1px dashed var(--rule-2);
  }

  .section-heading {
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto;
    gap: 12px 14px;
  }

  .section-heading .gloss {
    grid-column: 1 / -1;
    text-align: left;
    font-size: 0.5em;
    color: var(--ink-3);
    letter-spacing: 0.1em;
  }

  .masthead {
    padding-top: 20px;
  }

  .masthead-nav {
    gap: 18px;
  }

  .display {
    max-width: 100%;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  /* Mockup adapts: dual columns → stacked, smaller chrome */
  .mock-paragraph {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .mock-en {
    padding-bottom: 14px;
    border-bottom: 1px dashed var(--mock-rule-2);
  }
  .mock-title {
    font-size: 11px;
  }
  .mock-tb {
    width: 22px;
    height: 22px;
  }
  .mock-tb svg {
    width: 12px;
    height: 12px;
  }
  .mock-chapter {
    font-size: 18px;
  }
  .mock-status {
    font-size: 10px;
  }
}

@media (max-width: 480px) {
  .masthead-nav a:not(.external) {
    display: none;
  }
}

/* ============================================================
   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;
  }
}

/* ============================================================
   Hero entrance — staggered fade-up
   ============================================================ */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.masthead       { animation: fadeIn 600ms ease-out both; }
.hero .display  { animation: fadeUp 900ms cubic-bezier(0.16, 1, 0.3, 1) 100ms both; }
.hero-sub       { animation: fadeUp 900ms cubic-bezier(0.16, 1, 0.3, 1) 280ms both; }
.hero-gloss     { animation: fadeUp 900ms cubic-bezier(0.16, 1, 0.3, 1) 420ms both; }
.hero-actions   { animation: fadeUp 900ms cubic-bezier(0.16, 1, 0.3, 1) 560ms both; }
.hero-stage     { animation: fadeUp 1200ms cubic-bezier(0.16, 1, 0.3, 1) 700ms both; }