:root {
  --color-surface: #f6f6f5;
  --color-surface-alt: #ededec;
  --color-surface-deep: #e1e1df;
  --color-ink: #4a483b;
  --color-ink-soft: #6d6c5a;
  --color-ink-muted: #8b8974;
  --color-line: #d7d7d4;
  --color-primary: #7f7833;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e5e4da;
  --color-accent: #b35d23;
  --color-accent-ink: #ffffff;
  --color-highlight: #eadacf;
  --color-focus: #b05517;
  --color-contrast-surface: #27251a;
  --color-contrast-ink: #e7e7e4;
  --color-contrast-line: #515046;
  --color-contrast-accent: #d6722e;
  --overlay-scrim: linear-gradient(180deg, rgba(39, 37, 26, 0.35) 0%, rgba(39, 37, 26, 0.72) 55%, rgba(39, 37, 26, 0.92) 100%);
  --font-heading: "Songti SC", "Source Han Serif SC", "Noto Serif SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 12.9px;
  --text-sm: 15.5px;
  --text-base: 17px;
  --text-lg: 20.4px;
  --text-xl: 24.5px;
  --text-2xl: 29.4px;
  --text-3xl: 35.3px;
  --text-4xl: 42.3px;
  --text-display: clamp(34px, 6.6vw, 85px);
  --text-figure: clamp(28px, 4.8vw, 61px);
  --weight-heading: 687;
  --weight-body: 400;
  --leading-body: 1.83;
  --leading-heading: 1.24;
  --tracking-heading: -0.001em;
  --radius-sm: 4px;
  --radius-md: 4px;
  --radius-lg: 4px;
  --radius-pill: 4px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 1px 0 rgba(74, 72, 59, 0.12);
  --shadow-2: 0 2px 0 rgba(74, 72, 59, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1180px;
  --measure: 66ch;
  --gutter: 16px;
  --section-y: 84px;
  --section-y-lg: 118px;
}

/* ============================================================
   1. reset & 基础排版
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--color-surface);
  background-image: repeating-linear-gradient(
    0deg,
    color-mix(in srgb, var(--color-ink) 2%, transparent) 0 1px,
    transparent 1px 6px
  );
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
}

img, svg, video { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; color: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
p { margin: 0; }
[hidden] { display: none !important; }

h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* 展示级排版：仅首屏标题与大数字使用 */
.display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}
.figure-num {
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.mono-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.link-underline {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 45%, transparent);
  padding-bottom: 1px;
}
.link-underline:hover { border-bottom-color: var(--color-accent); }

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 7px;
  border-radius: var(--radius-sm);
  background-color: var(--color-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 18%, transparent);
  vertical-align: middle;
}

/* 长文 */
.prose {
  max-width: var(--measure);
  color: var(--color-ink);
}
.prose p + p { margin-top: var(--space-2); }
.prose h2 {
  font-size: var(--text-2xl);
  margin: var(--space-6) 0 var(--space-2);
}
.prose h3 {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  margin: var(--space-4) 0 var(--space-1);
}
.prose ul, .prose ol {
  margin: var(--space-2) 0;
  padding-left: 1.35em;
}
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 6px; }
.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============================================================
   2. 布局
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--flush { padding-block: 0; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.section-kicker {
  display: block;
  margin-bottom: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-primary);
}
.section-title { font-size: var(--text-3xl); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

/* ============================================================
   3. 纸片 / 贴纸 / 分隔 / 强调
   ============================================================ */
.paper-panel {
  position: relative;
  isolation: isolate;
  padding: var(--space-4);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.paper-panel::before {
  content: "";
  position: absolute;
  inset: 8px -8px -8px 8px;
  z-index: -1;
  background-color: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
}
.paper-panel--alt { background-color: var(--color-surface-alt); }
.paper-panel--deep { background-color: var(--color-surface-deep); }
.paper-panel--flat { box-shadow: none; }
.paper-panel--flat::before { display: none; }

.sticker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 26%, transparent);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  line-height: 1;
  white-space: nowrap;
}
.sticker--accent {
  background-color: color-mix(in srgb, var(--color-accent) 12%, var(--color-surface));
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 30%, transparent);
}
.sticker--dark {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.sticker--corner,
.sticker--corner-left {
  position: absolute;
  top: -11px;
  z-index: 2;
  transform: rotate(-1.5deg);
}
.sticker--corner { right: var(--space-3); }
.sticker--corner-left { left: var(--space-3); }

.rule-offset {
  position: relative;
  height: 1px;
  margin-block: var(--space-6);
  border: 0;
  background-color: var(--color-line);
}
.rule-offset::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 72px;
  height: 3px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
}

.tick-ruler {
  height: 14px;
  border-bottom: var(--border-thin) solid var(--color-line);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-line) 0 1px,
    transparent 1px 16px
  );
}

.quote-block {
  position: relative;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-6);
  background-color: var(--color-highlight);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-ink);
}
.quote-block::before {
  content: "\201C";
  position: absolute;
  top: 2px;
  left: 12px;
  font-family: var(--font-heading);
  font-size: 48px;
  line-height: 1;
  color: color-mix(in srgb, var(--color-accent) 42%, transparent);
}

.indent-note {
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}

/* 深色对照区 */
.contrast-band {
  position: relative;
  padding: var(--space-6);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
}
.contrast-band h1,
.contrast-band h2,
.contrast-band h3,
.contrast-band h4 { color: var(--color-contrast-ink); }
.contrast-band a { color: var(--color-contrast-accent); }
.contrast-band .rule-offset { background-color: var(--color-contrast-line); }
.contrast-band .rule-offset::before { background-color: var(--color-contrast-accent); }
.contrast-band .tick-ruler {
  border-bottom-color: var(--color-contrast-line);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-contrast-line) 0 1px,
    transparent 1px 16px
  );
}
.contrast-band .sticker {
  background-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
  box-shadow: none;
}
.contrast-band .quote-block {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 16%, var(--color-contrast-surface));
  border-left-color: var(--color-contrast-accent);
  color: var(--color-contrast-ink);
}
.contrast-muted {
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, var(--color-contrast-surface));
}

/* ============================================================
   4. 按钮 / 标签筛选
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 16px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 200ms ease-out, color 200ms ease-out, border-color 200ms ease-out;
}
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}
.btn-primary:hover { background-color: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface)); }
.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  box-shadow: var(--shadow-1);
}
.btn-accent:hover { background-color: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface)); }
.btn-ghost {
  background-color: var(--color-surface);
  color: var(--color-ink);
  border-color: var(--color-line);
  box-shadow: var(--shadow-1);
}
.btn-ghost:hover {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 40%, var(--color-line));
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}
.chip {
  appearance: none;
  padding: 7px 12px;
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color 200ms ease-out, color 200ms ease-out, border-color 200ms ease-out;
}
.chip:hover {
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
}
.chip[aria-pressed="true"],
.chip.is-active {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-primary);
}

/* ============================================================
   5. 面包屑 / 图片容器
   ============================================================ */
.breadcrumb {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}
.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--color-line);
}

.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface-deep);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-color: color-mix(in srgb, var(--color-primary) 22%, transparent);
  mix-blend-mode: multiply;
}
.media-frame--duotone::after {
  background-color: color-mix(in srgb, var(--color-accent) 28%, transparent);
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--empty {
  min-height: 180px;
  background-image: repeating-linear-gradient(
    -45deg,
    var(--color-surface-deep) 0 10px,
    var(--color-surface-alt) 10px 20px
  );
}
.media-frame--empty::after { display: none; }
.media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: var(--space-3);
  background-image: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.5;
}

/* ============================================================
   6. 头部
   ============================================================ */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -80px;
  z-index: 100;
  padding: 10px 16px;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: top 160ms ease-out;
}
.skip-link:focus { top: var(--space-2); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  padding: var(--space-2) var(--space-3);
  background-color: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(10px);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 70;
  pointer-events: none;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.header-shell {
  max-width: var(--container);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.brand-island {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px 6px 6px;
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  text-decoration: none;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  transform: rotate(-3deg);
}
.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.15;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.brand-sub {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.nav-island {
  display: block;
  margin-left: auto;
  padding: 5px;
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-list a {
  position: relative;
  display: inline-block;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: background-color 200ms ease-out, color 200ms ease-out;
}
.nav-list a:hover {
  background-color: var(--color-surface);
  color: var(--color-ink);
}
.nav-list a[aria-current="page"] {
  background-color: var(--color-surface);
  color: var(--color-ink);
  box-shadow: var(--shadow-1);
}
.nav-list a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 2px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: var(--space-2);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  cursor: pointer;
}
.nav-toggle-bars {
  display: grid;
  gap: 3px;
  width: 16px;
}
.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: var(--radius-sm);
  background-color: currentColor;
  transition: transform 240ms ease-out, opacity 200ms ease-out;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.site-header[data-scrolled="true"] .header-shell .brand-island,
.site-header[data-scrolled="true"] .header-shell .nav-island { box-shadow: var(--shadow-2); }
.site-header[data-scrolled="true"] .brand-mark { transform: rotate(0deg); }

/* ============================================================
   7. 页脚
   ============================================================ */
.site-footer {
  margin-top: var(--section-y);
  padding: var(--space-6) var(--space-3) var(--space-4);
  background-color: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-shell {
  max-width: var(--container);
  margin-inline: auto;
}
.footer-ruler { margin-bottom: var(--space-4); }

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  padding-bottom: 10px;
}
.footer-cell {
  position: relative;
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.footer-cell:nth-child(2),
.footer-cell:nth-child(4) { transform: translateY(10px); }

.footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.footer-tagline {
  margin: var(--space-2) 0 var(--space-3);
  max-width: 30ch;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.footer-index {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}
.footer-col-title {
  margin-bottom: var(--space-2);
  padding-bottom: 6px;
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-ink);
}
.footer-links li + li { margin-top: 6px; }
.footer-links a {
  display: inline-block;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 200ms ease-out, border-color 200ms ease-out;
}
.footer-links a:hover {
  color: var(--color-accent);
  border-bottom-color: color-mix(in srgb, var(--color-accent) 50%, transparent);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--gutter);
  margin-top: var(--space-3);
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.footer-contact-item { min-width: 0; }
.footer-contact-label {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}
.footer-contact-value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink);
  word-break: break-word;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-legal-line {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

/* ============================================================
   8. 动效
   ============================================================ */
.js-enabled .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 360ms ease-out, transform 360ms ease-out;
  transition-delay: var(--reveal-delay, 0ms);
}
.js-enabled .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

/* ============================================================
   9. 响应式
   ============================================================ */
@media (max-width: 1120px) {
  .header-actions .btn-ghost { display: none; }
}

@media (max-width: 1080px) {
  .site-header { padding: var(--space-2); }
  .header-shell { flex-wrap: wrap; row-gap: var(--space-2); }
  .nav-toggle { display: inline-flex; }
  .nav-island {
    order: 3;
    flex: 1 0 100%;
    width: 100%;
    margin-left: 0;
    padding: var(--space-2);
    display: none;
    background-color: var(--color-surface-alt);
    box-shadow: var(--shadow-2);
  }
  .nav-island[data-open="true"] { display: block; }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-list li + li { border-top: var(--border-thin) solid var(--color-line); }
  .nav-list a {
    display: block;
    padding: 13px 10px;
    border-radius: 0;
  }
  .nav-list a[aria-current="page"] {
    background-color: var(--color-primary-soft);
    box-shadow: none;
  }
  .nav-list a[aria-current="page"]::after { display: none; }
  .header-actions { margin-left: auto; }
}

@media (max-width: 1023px) {
  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .span-6, .span-7, .span-8 { grid-column: span 12; }
  .split {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-4);
  }
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding-bottom: 0;
  }
  .footer-cell:nth-child(2),
  .footer-cell:nth-child(4) { transform: none; }
}

@media (max-width: 639px) {
  :root { --section-y: 56px; --section-y-lg: 72px; }
  .container { padding-inline: var(--space-2); }
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .paper-panel { padding: var(--space-3); }
  .paper-panel::before { inset: 6px -6px -6px 6px; }
  .contrast-band { padding: var(--space-4); }
  .brand-sub { display: none; }
  .brand-name { font-size: var(--text-base); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-legal { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .js-enabled .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}