:root {
  --color-surface: #f3f2f2;
  --color-surface-alt: #ebe9e9;
  --color-surface-deep: #dfdddd;
  --color-ink: #4e4142;
  --color-ink-soft: #766566;
  --color-ink-muted: #887778;
  --color-line: #d5d2d2;
  --color-primary: #db2433;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f0d5d7;
  --color-accent: #887320;
  --color-accent-ink: #ffffff;
  --color-highlight: #e0dbcc;
  --color-focus: #7f6a15;
  --color-contrast-surface: #241314;
  --color-contrast-ink: #e7e4e4;
  --color-contrast-line: #4f4142;
  --color-contrast-accent: #ceae31;
  --overlay-scrim: linear-gradient(180deg, rgba(36, 19, 20, 0.35) 0%, rgba(36, 19, 20, 0.72) 55%, rgba(36, 19, 20, 0.92) 100%);
  --font-heading: "Songti SC", STSong, "Source Han Serif SC", SimSun, serif;
  --font-body: "Songti SC", STSong, "Source Han Serif SC", SimSun, serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 14.6px;
  --text-base: 16px;
  --text-lg: 19.2px;
  --text-xl: 23.0px;
  --text-2xl: 27.6px;
  --text-3xl: 33.2px;
  --text-4xl: 39.8px;
  --text-display: clamp(34px, 6.5vw, 83px);
  --text-figure: clamp(28px, 4.7vw, 60px);
  --weight-heading: 670;
  --weight-body: 400;
  --leading-body: 1.9;
  --leading-heading: 1.26;
  --tracking-heading: 0.025em;
  --radius-sm: 1px;
  --radius-md: 2px;
  --radius-lg: 2px;
  --radius-pill: 2px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1080px;
  --measure: 69ch;
  --gutter: 24px;
  --section-y: 106px;
  --section-y-lg: 148px;
}

/* ===== reset ===== */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  letter-spacing: 0;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; letter-spacing: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
blockquote, q { quotes: none; }

main { display: block; flex: 1 0 auto; }
#main-content { scroll-margin-top: var(--space-8); }

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

/* ===== 容器与栅格 ===== */
.k-container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}
.k-container--narrow { max-width: 62ch; }

.k-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.k-col-3 { grid-column: span 3; }
.k-col-4 { grid-column: span 4; }
.k-col-5 { grid-column: span 5; }
.k-col-6 { grid-column: span 6; }
.k-col-7 { grid-column: span 7; }
.k-col-8 { grid-column: span 8; }
.k-col-9 { grid-column: span 9; }
.k-col-12 { grid-column: span 12; }

/* ===== 区块与分隔 ===== */
.k-section { padding-block: var(--section-y); }
.k-section--lg { padding-block: var(--section-y-lg); }

.k-section--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.k-section--contrast .k-h1,
.k-section--contrast .k-h2,
.k-section--contrast .k-h3,
.k-section--contrast .k-h4,
.k-section--contrast .k-h5,
.k-section--contrast .k-heading-center__title { color: var(--color-contrast-ink); }
.k-section--contrast .k-lede,
.k-section--contrast .k-meta,
.k-section--contrast .k-heading-center__lede {
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}
.k-section--contrast .k-rule { border-color: var(--color-contrast-line); }
.k-section--contrast .k-rule--accent { border-top-color: var(--color-contrast-accent); }
.k-section--contrast .k-seq { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }
.k-section--contrast .k-card {
  background-color: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.k-section--contrast .k-card::after { border-color: var(--color-contrast-line); }

.k-rule {
  height: 6px;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
  margin: 0;
}
.k-rule--accent { border-top-color: var(--color-primary); }

/* ===== 排版 ===== */
.k-display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.08;
  letter-spacing: 0.06em;
  color: var(--color-ink);
}

.k-h1, .k-h2, .k-h3, .k-h4, .k-h5 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.k-h1 { font-size: var(--text-4xl); }
.k-h2 { font-size: var(--text-3xl); }
.k-h3 { font-size: var(--text-2xl); }
.k-h4 { font-size: var(--text-xl); }
.k-h5 { font-size: var(--text-lg); }

.k-lede {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-ink-soft);
  max-width: 56ch;
}
.k-meta {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  line-height: 1.6;
}

.k-prose {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}
.k-prose p + p { margin-top: var(--space-2); }
.k-prose .k-h3 { margin-top: var(--space-4); margin-bottom: var(--space-2); }
.k-prose ul { margin-top: var(--space-2); }
.k-prose li {
  position: relative;
  padding-left: var(--space-3);
  margin-top: var(--space-1);
}
.k-prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 8px;
  height: 1px;
  background-color: var(--color-accent);
}

.k-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-primary);
}
.k-eyebrow::before {
  content: "";
  width: 14px;
  height: 6px;
  border-top: var(--border-thin) solid var(--color-primary);
  border-bottom: var(--border-thin) solid var(--color-primary);
}

.k-seq {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  padding-inline: 4px;
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  line-height: 1;
}

.k-heading-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  text-align: center;
  margin-bottom: var(--space-6);
}
.k-heading-center__title {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: 0.06em;
  color: var(--color-ink);
}
.k-heading-center__lede {
  font-size: var(--text-base);
  color: var(--color-ink-soft);
  max-width: 56ch;
  line-height: 1.8;
}

.k-quote {
  position: relative;
  margin-block: var(--space-4);
  padding-left: 16px;
  font-size: var(--text-lg);
  line-height: 1.8;
  color: var(--color-ink);
  max-width: 52ch;
}
.k-quote::after {
  content: "";
  display: block;
  width: 12px;
  height: 2px;
  margin-top: var(--space-2);
  background-color: var(--color-primary);
}
.k-quote__source {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.k-highlight {
  background-color: var(--color-highlight);
  padding: 0 4px;
}

.k-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  line-height: 1.05;
  letter-spacing: 0;
  color: var(--color-accent);
}
.k-num--inline { font-size: calc(var(--text-base) * 1.6); }
.k-num--contrast { color: var(--color-contrast-accent); }
.k-num--pulse { animation: k-num-pulse 180ms ease-out 1; }

@keyframes k-num-pulse {
  0% { filter: brightness(1.75) saturate(1.25); }
  100% { filter: brightness(1) saturate(1); }
}

.k-tag {
  display: inline-block;
  padding: 2px 8px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  line-height: 1.6;
}
.k-tag--primary {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}
.k-tag--accent {
  border-color: var(--color-accent);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

/* ===== 按钮 ===== */
.k-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 10px 20px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  line-height: 1.5;
  transition: color 140ms ease, border-color 140ms ease;
}
.k-btn::after {
  content: "";
  position: absolute;
  inset: 3px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  transition: border-color 140ms ease;
  pointer-events: none;
}
.k-btn:hover { color: var(--color-primary); border-color: var(--color-primary); }
.k-btn:hover::after { border-color: var(--color-primary); }

.k-btn--solid {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.k-btn--solid::after { border-color: var(--color-contrast-line); }
.k-btn--solid:hover {
  color: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
}
.k-btn--solid:hover::after { border-color: var(--color-contrast-accent); }

/* ===== 面包屑 ===== */
.k-breadcrumb { font-size: var(--text-xs); letter-spacing: 0.08em; }
.k-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  color: var(--color-ink-muted);
}
.k-breadcrumb__item { display: inline-flex; align-items: center; gap: 6px; }
.k-breadcrumb__item + .k-breadcrumb__item::before {
  content: "／";
  color: var(--color-line);
}
.k-breadcrumb__link { color: var(--color-ink-soft); }
.k-breadcrumb__link:hover { color: var(--color-primary); }
.k-breadcrumb__current { color: var(--color-ink); }

/* ===== 卡片 ===== */
.k-card {
  position: relative;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}
.k-card::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  pointer-events: none;
}
.k-card--alt { background-color: var(--color-surface-alt); }
.k-card > * { position: relative; z-index: 1; }

/* ===== 图片与媒体 ===== */
.k-figure { margin: 0; }
.k-figure__frame {
  padding: 4px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-alt);
}
.k-figure__media {
  position: relative;
  overflow: hidden;
  outline: var(--border-thin) solid var(--color-line);
  outline-offset: -1px;
  background-color: var(--color-surface-deep);
}
.k-figure__media > img { width: 100%; height: 100%; object-fit: cover; }
.k-figure__caption {
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

.k-ratio-16x9 { aspect-ratio: 16 / 9; }
.k-ratio-4x3 { aspect-ratio: 4 / 3; }
.k-ratio-1x1 { aspect-ratio: 1 / 1; }
.k-ratio-3x4 { aspect-ratio: 3 / 4; }

.k-media {
  position: relative;
  padding: 4px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
}
.k-media__frame { position: relative; overflow: hidden; }
.k-media__frame > img { width: 100%; height: 100%; object-fit: cover; }
.k-media__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.k-media__body {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
  z-index: 1;
}
.k-media__body .k-h3,
.k-media__body .k-h4 { color: var(--color-contrast-ink); }

/* ===== 标签页 ===== */
.k-tabs { margin-block: var(--space-4); }
.k-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.k-tabs__tab {
  padding: 8px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transition: color 140ms ease, background-color 140ms ease, border-color 140ms ease;
}
.k-tabs__tab:hover { color: var(--color-ink); border-color: var(--color-primary); }
.k-tabs__tab[aria-selected="true"] {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-ink);
}
.k-tabs__panel { padding-top: var(--space-3); }
.k-tabs__panel[hidden] { display: none; }

/* ===== 折叠面板 ===== */
.k-disclosure { border-top: var(--border-thin) solid var(--color-line); }
.k-disclosure:last-child { border-bottom: var(--border-thin) solid var(--color-line); }
.k-disclosure__trigger {
  display: flex;
  width: 100%;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  text-align: left;
  color: var(--color-ink);
  font-size: var(--text-base);
  letter-spacing: 0.02em;
  transition: color 140ms ease;
}
.k-disclosure__trigger:hover { color: var(--color-primary); }
.k-disclosure__trigger::after {
  content: "＋";
  color: var(--color-accent);
  font-size: var(--text-lg);
  line-height: 1;
}
.k-disclosure__trigger[aria-expanded="true"]::after { content: "－"; }
.k-disclosure__panel { padding-bottom: var(--space-3); color: var(--color-ink-soft); }
.k-disclosure__panel[hidden] { display: none; }

/* ===== 头部 ===== */
.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -200px;
  z-index: 120;
  padding: 10px 16px;
  border: var(--border-thin) solid var(--color-contrast-line);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transition: top 160ms ease;
}
.skip-link:focus { top: var(--space-2); }
.skip-link:focus-visible { outline-color: var(--color-contrast-accent); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  padding-block: var(--space-2);
  transition: padding 160ms ease;
}
.site-header::before {
  content: "";
  position: absolute;
  inset: -2px 0 -10px 0;
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-surface) 70%, rgba(243, 242, 242, 0) 100%);
  opacity: 0;
  transition: opacity 200ms ease;
  pointer-events: none;
}
.site-header[data-scrolled] { padding-block: var(--space-1); }
.site-header[data-scrolled]::before { opacity: 1; }

.site-header__inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.brand-island {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 12px 18px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
}
.brand-island::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 8px;
  height: 8px;
  border-top: var(--border-thin) solid var(--color-primary);
  border-left: var(--border-thin) solid var(--color-primary);
}
.brand-island::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 8px;
  height: 8px;
  border-right: var(--border-thin) solid var(--color-primary);
  border-bottom: var(--border-thin) solid var(--color-primary);
}
.brand-island__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.1em;
  line-height: 1.2;
  color: var(--color-ink);
  white-space: nowrap;
}

.nav-island {
  position: relative;
  padding: 10px 16px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
}
.nav-island::before {
  content: "";
  position: absolute;
  inset: 4px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  pointer-events: none;
}
.nav-island__list {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-island__item { display: block; }
.nav-island__link {
  position: relative;
  display: inline-block;
  padding: 5px 11px;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  line-height: 1.6;
  white-space: nowrap;
  transition: color 140ms ease;
}
.nav-island__link::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 1px;
  height: 1px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 160ms ease;
}
.nav-island__link:hover { color: var(--color-ink); }
.nav-island__link:hover::after { transform: scaleX(1); }
.nav-island__link[aria-current="page"] {
  color: var(--color-primary);
  font-weight: var(--weight-heading);
}
.nav-island__link[aria-current="page"]::after { transform: scaleX(1); }

.status-island {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  line-height: 1.4;
  color: var(--color-ink-muted);
  white-space: nowrap;
}
.status-island__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 11px 16px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  line-height: 1.2;
}
.nav-toggle__bars {
  display: block;
  width: 16px;
  height: 9px;
  border-top: var(--border-thin) solid var(--color-primary);
  border-bottom: var(--border-thin) solid var(--color-primary);
}
.nav-toggle[aria-expanded="true"] {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ===== 页脚 ===== */
.site-footer {
  margin-top: var(--section-y);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.ornament-line {
  display: block;
  width: 100%;
  height: 8px;
  color: var(--color-contrast-line);
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3);
}
.site-footer__brand {
  padding: 6px 14px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.14em;
  color: var(--color-contrast-ink);
}
.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
}
.site-footer__links a {
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
  transition: color 140ms ease;
}
.site-footer__links a:hover { color: var(--color-contrast-accent); }
.site-footer__icp {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-4);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: 0 var(--space-3) var(--space-3);
  font-size: var(--text-xs);
  line-height: 1.8;
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

/* ===== 响应式 ===== */
@media (max-width: 1080px) {
  .k-container, .site-header__inner, .site-footer__inner, .site-footer__meta {
    padding-inline: var(--space-3);
  }
}

@media (max-width: 940px) {
  .nav-island { display: none; }
  .status-island { display: none; }
  .nav-toggle { display: inline-flex; }

  .nav-island[data-open] {
    display: block;
    position: absolute;
    top: calc(100% + var(--space-2));
    left: var(--space-3);
    right: var(--space-3);
    z-index: 80;
  }
  .nav-island[data-open]::before { inset: 4px; }
  .nav-island[data-open] .nav-island__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-island[data-open] .nav-island__link {
    display: block;
    padding: 11px 10px;
    font-size: var(--text-base);
    border-bottom: var(--border-thin) solid var(--color-line);
  }
  .nav-island[data-open] .nav-island__item:last-child .nav-island__link { border-bottom: 0; }
  .nav-island[data-open] .nav-island__link::after {
    left: 10px;
    right: 10px;
    bottom: 4px;
  }

  .k-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .k-col-3, .k-col-4, .k-col-5, .k-col-6,
  .k-col-7, .k-col-8, .k-col-9, .k-col-12 { grid-column: span 6; }

  .k-section { padding-block: var(--space-8); }
  .k-section--lg { padding-block: var(--space-8); }
  .site-footer { margin-top: var(--space-8); }
}

@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .k-grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-3); }
  .k-col-3, .k-col-4, .k-col-5, .k-col-6,
  .k-col-7, .k-col-8, .k-col-9, .k-col-12 { grid-column: span 1; }

  .site-header { padding-block: var(--space-1); }
  .brand-island { padding: 10px 14px; }
  .brand-island__name { font-size: var(--text-base); letter-spacing: 0.08em; }
  .nav-toggle { padding: 10px 13px; }

  .k-heading-center { gap: var(--space-1); margin-bottom: var(--space-4); }
  .k-heading-center__title { font-size: var(--text-2xl); }
  .k-quote { padding-left: 12px; font-size: var(--text-base); }

  .site-footer__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
  .site-footer__meta { flex-direction: column; gap: 2px; }
}

@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;
  }
  .k-num--pulse { animation: none !important; }
}