/* ===== 6米乐赛场 · 共享站点样式 ===== */
:root {
  --m6-ink: #07111F;
  --m6-ink-2: #0D1B2E;
  --m6-paper: #F2E8D8;
  --m6-cyan: #22D3EE;
  --m6-orange: #FF5A36;
  --m6-lime: #B7F34A;
  --m6-white: #EAF4FF;
  --m6-steel: #7C8EA6;
  --m6-alert: #FF3D5A;
  --m6-grid: #1E3350;
  --m6-font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --m6-font-display: "Arial Black", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --m6-font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "Roboto Mono", Consolas, "Liberation Mono", monospace;
  --m6-header-h: 76px;
  --m6-ease: cubic-bezier(.22, .61, .36, 1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul[class], ol[class] { list-style: none; padding: 0; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
main { scroll-margin-top: calc(var(--m6-header-h) + 16px); }
::selection { background: var(--m6-cyan); color: #041018; }

body {
  background:
    radial-gradient(900px 520px at 88% -8%, rgba(34, 211, 238, .09), transparent 68%),
    radial-gradient(720px 460px at 2% 10%, rgba(255, 90, 54, .055), transparent 70%),
    var(--m6-ink);
  color: var(--m6-white);
  font-family: var(--m6-font-sans);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--m6-cyan);
  outline-offset: 3px;
}

/* ===== 工具类 ===== */
.m6-sr {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.m6-muted { color: var(--m6-steel); }
.m6-mono { font-family: var(--m6-font-mono); }
.m6-link {
  color: var(--m6-cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .22em;
}
.m6-link:hover { color: var(--m6-white); }

/* ===== 排版 ===== */
.m6-h1, .m6-h2, .m6-h3, .m6-h4 {
  font-family: var(--m6-font-display);
  font-style: italic;
  font-weight: 900;
  letter-spacing: -.015em;
  line-height: 1.06;
  color: var(--m6-white);
  text-wrap: balance;
}
.m6-h1 { font-size: clamp(2.3rem, 4.6vw, 4.25rem); text-shadow: 0 0 28px rgba(34, 211, 238, .16); }
.m6-h2 { font-size: clamp(1.85rem, 3.4vw, 2.7rem); text-shadow: 0 0 22px rgba(34, 211, 238, .1); }
.m6-h3 { font-size: clamp(1.25rem, 2vw, 1.6rem); line-height: 1.2; }
.m6-h4 { font-size: 1.1rem; line-height: 1.3; }
.m6-lead {
  max-width: 58ch;
  font-size: clamp(1rem, 1.35vw, 1.15rem);
  line-height: 1.7;
  color: rgba(234, 244, 255, .8);
}
.m6-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--m6-font-mono);
  font-size: 12px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--m6-cyan);
}
.m6-eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--m6-orange);
}

/* ===== 布局 ===== */
.m6-shell {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 40px);
}
.m6-shell--narrow { max-width: 980px; }
.m6-section { padding-block: clamp(48px, 7vw, 96px); }
.m6-section--tight { padding-block: clamp(30px, 4vw, 56px); }
.m6-grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 28px);
}
.m6-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.m6-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.m6-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.m6-grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }

/* ===== 按钮 ===== */
.m6-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid transparent;
  font-family: var(--m6-font-sans);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1;
  white-space: nowrap;
  transition: background-color .16s var(--m6-ease), border-color .16s var(--m6-ease), color .16s var(--m6-ease), transform .16s var(--m6-ease), box-shadow .16s var(--m6-ease);
}
.m6-btn:hover { transform: translateY(-1px); }
.m6-btn--ghost {
  border-color: rgba(124, 142, 166, .5);
  background: rgba(13, 27, 46, .35);
  color: var(--m6-white);
}
.m6-btn--ghost:hover { border-color: var(--m6-cyan); color: var(--m6-cyan); }
.m6-btn--signal {
  border-color: var(--m6-orange);
  background: var(--m6-orange);
  color: #150806;
  box-shadow: 0 8px 24px rgba(255, 90, 54, .22);
}
.m6-btn--signal:hover {
  background: #FF7052;
  border-color: #FF7052;
  box-shadow: 0 10px 30px rgba(255, 90, 54, .32);
}
.m6-btn--cyan {
  border-color: var(--m6-cyan);
  background: var(--m6-cyan);
  color: #04141A;
}
.m6-btn--cyan:hover { background: #5EE4F6; border-color: #5EE4F6; }
.m6-btn--quiet {
  min-height: 0;
  padding: 0;
  border: 0;
  background: none;
  color: var(--m6-cyan);
}
.m6-btn--quiet:hover { color: var(--m6-white); transform: none; }

/* ===== 头部 ===== */
.m6-skip {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 999;
  padding: 10px 16px;
  background: var(--m6-cyan);
  color: #041018;
  font-weight: 700;
  font-size: 14px;
  transform: translateY(-180%);
  transition: transform .18s var(--m6-ease);
}
.m6-skip:focus { transform: translateY(0); }

.m6-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background-color: rgba(7, 17, 31, 0);
  transition: background-color .18s var(--m6-ease), box-shadow .18s var(--m6-ease);
}
.m6-header--solid {
  background-color: rgba(7, 17, 31, .95);
  box-shadow: 0 1px 0 var(--m6-grid), 0 18px 40px rgba(0, 0, 0, .28);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}
.m6-header__rail {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(30, 51, 80, .45);
  overflow: hidden;
  pointer-events: none;
}
.m6-header__rail > span {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--m6-cyan), var(--m6-lime));
  transition: transform .08s linear;
}
.m6-header__inner {
  max-width: 1320px;
  margin-inline: auto;
  min-height: var(--m6-header-h);
  padding-inline: clamp(16px, 3vw, 40px);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 36px);
}

/* 品牌 */
.m6-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}
.m6-brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--m6-orange);
  color: #100704;
  font-family: var(--m6-font-mono);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -.02em;
  clip-path: polygon(0 0, 100% 0, 100% 78%, 78% 100%, 0 100%);
}
.m6-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.m6-brand__name {
  font-family: var(--m6-font-display);
  font-style: italic;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: .01em;
  color: var(--m6-white);
}
.m6-brand__sub {
  margin-top: 3px;
  font-family: var(--m6-font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--m6-cyan);
}

/* 导航 */
.m6-nav { margin-left: auto; }
.m6-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.m6-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 11px;
  font-size: 13.5px;
  letter-spacing: .06em;
  color: rgba(234, 244, 255, .72);
  white-space: nowrap;
  transition: color .16s var(--m6-ease);
}
.m6-nav__link::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 6px;
  height: 2px;
  background: var(--m6-cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s var(--m6-ease);
}
.m6-nav__link:hover { color: var(--m6-white); }
.m6-nav__link:hover::after { transform: scaleX(1); }
.m6-nav__link[aria-current="page"] { color: var(--m6-cyan); }
.m6-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--m6-orange);
}

.m6-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* 汉堡按钮 */
.m6-burger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(124, 142, 166, .5);
  background: rgba(13, 27, 46, .5);
  color: var(--m6-white);
}
.m6-burger__box,
.m6-burger__box::before,
.m6-burger__box::after {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  transition: transform .18s var(--m6-ease), opacity .18s var(--m6-ease), background-color .18s var(--m6-ease);
}
.m6-burger__box { position: relative; }
.m6-burger__box::before,
.m6-burger__box::after {
  content: "";
  position: absolute;
  left: 0;
}
.m6-burger__box::before { top: -6px; }
.m6-burger__box::after { top: 6px; }
.m6-burger[aria-expanded="true"] .m6-burger__box { background: transparent; }
.m6-burger[aria-expanded="true"] .m6-burger__box::before { transform: translateY(6px) rotate(45deg); }
.m6-burger[aria-expanded="true"] .m6-burger__box::after { transform: translateY(-6px) rotate(-45deg); }

/* ===== 页脚 ===== */
.m6-footer {
  position: relative;
  background: #050C16;
  border-top: 1px solid var(--m6-grid);
  padding: clamp(44px, 7vw, 84px) 0 28px;
}
.m6-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(220px, 30vw);
  height: 3px;
  background: linear-gradient(90deg, var(--m6-orange), rgba(255, 90, 54, 0));
}
.m6-footer__grid {
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 40px);
  display: grid;
  grid-template-columns: minmax(220px, 1.7fr) repeat(2, minmax(130px, .9fr)) minmax(220px, 1.4fr);
  gap: clamp(28px, 4vw, 56px);
}
.m6-footer__brand .m6-brand { align-items: center; }
.m6-footer__tagline {
  margin-top: 18px;
  max-width: 26ch;
  font-size: 15px;
  color: var(--m6-white);
}
.m6-footer__site {
  margin-top: 10px;
  font-family: var(--m6-font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--m6-cyan);
}
.m6-footer__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--m6-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .22em;
  color: var(--m6-steel);
  text-transform: uppercase;
}
.m6-footer__title::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--m6-orange);
  transform: rotate(45deg);
}
.m6-footer__list {
  display: grid;
  gap: 9px;
}
.m6-footer__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: rgba(234, 244, 255, .74);
  transition: color .16s var(--m6-ease);
}
.m6-footer__link::before {
  content: "";
  width: 10px;
  height: 1px;
  background: var(--m6-grid);
  transition: width .16s var(--m6-ease), background-color .16s var(--m6-ease);
}
.m6-footer__link:hover { color: var(--m6-cyan); }
.m6-footer__link:hover::before { width: 18px; background: var(--m6-cyan); }
.m6-footer__contact {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}
.m6-footer__contact p { display: grid; gap: 2px; }
.m6-footer__label {
  font-family: var(--m6-font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--m6-steel);
}
.m6-footer__value {
  font-size: 13px;
  color: var(--m6-white);
  overflow-wrap: anywhere;
}
.m6-footer__note {
  margin-top: 14px;
  padding-left: 10px;
  border-left: 2px solid var(--m6-grid);
  font-size: 12px;
  line-height: 1.65;
  color: var(--m6-steel);
}
.m6-footer__base {
  max-width: 1320px;
  margin: clamp(32px, 5vw, 56px) auto 0;
  padding: clamp(18px, 2.5vw, 24px) clamp(16px, 3vw, 40px) 0;
  border-top: 1px solid var(--m6-grid);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  font-family: var(--m6-font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--m6-steel);
}

/* 返回顶部 */
.m6-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 90;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--m6-grid);
  background: rgba(13, 27, 46, .94);
  color: var(--m6-cyan);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: opacity .2s var(--m6-ease), transform .2s var(--m6-ease), visibility .2s, border-color .16s var(--m6-ease), background-color .16s var(--m6-ease);
}
.m6-top--on {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.m6-top:hover {
  border-color: var(--m6-cyan);
  background: rgba(34, 211, 238, .12);
}
.m6-top__icon {
  font-family: var(--m6-font-mono);
  font-size: 17px;
  line-height: 1;
}

/* ===== 面包屑 ===== */
.m6-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--m6-font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--m6-steel);
}
.m6-breadcrumb a { color: var(--m6-steel); transition: color .16s var(--m6-ease); }
.m6-breadcrumb a:hover { color: var(--m6-cyan); }
.m6-breadcrumb [aria-current="page"] { color: var(--m6-white); }
.m6-breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }
.m6-breadcrumb li + li::before { content: "/"; color: var(--m6-grid); }

/* ===== 章节目录 ===== */
.m6-toc {
  position: sticky;
  top: calc(var(--m6-header-h) + 24px);
  padding-left: 16px;
  border-left: 1px solid var(--m6-grid);
  font-size: 13px;
}
.m6-toc a {
  display: block;
  padding: 6px 0;
  color: var(--m6-steel);
  transition: color .16s var(--m6-ease), padding-left .16s var(--m6-ease);
}
.m6-toc a:hover { color: var(--m6-cyan); padding-left: 4px; }
.m6-toc a[aria-current="location"] {
  color: var(--m6-cyan);
  padding-left: 4px;
}

/* ===== 看板 / 卡片 ===== */
.m6-panel {
  position: relative;
  background: linear-gradient(155deg, #0D1B2E 0%, #0A1526 100%);
  border: 1px solid var(--m6-grid);
  padding: clamp(18px, 2.4vw, 28px);
  transition: transform .2s var(--m6-ease), border-color .2s var(--m6-ease), background-color .2s var(--m6-ease);
}
.m6-panel:hover {
  transform: translateY(-2px);
  border-color: rgba(34, 211, 238, .45);
}
.m6-panel--cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}
.m6-panel--signal { border-top: 3px solid var(--m6-orange); }

/* ===== 图片容器 ===== */
.m6-media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--m6-grid);
  background-color: #0A1626;
  background-image:
    linear-gradient(135deg, rgba(34, 211, 238, .12), rgba(7, 17, 31, 0) 46%),
    repeating-linear-gradient(90deg, rgba(30, 51, 80, .38) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, rgba(30, 51, 80, .28) 0 1px, transparent 1px 64px);
}
.m6-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.m6-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(7, 17, 31, 0) 55%, rgba(7, 17, 31, .72) 100%);
}
.m6-media--wide { aspect-ratio: 21 / 9; }
.m6-media--16x9 { aspect-ratio: 16 / 9; }
.m6-media--4x3 { aspect-ratio: 4 / 3; }
.m6-media--3x4 { aspect-ratio: 3 / 4; }
.m6-media--square { aspect-ratio: 1 / 1; }

/* ===== 长文 ===== */
.m6-prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(234, 244, 255, .9);
}
.m6-prose > * + * { margin-top: 1em; }
.m6-prose h2 {
  margin-top: 1.7em;
  font-family: var(--m6-font-display);
  font-style: italic;
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--m6-white);
}
.m6-prose h3 {
  margin-top: 1.5em;
  font-size: 1.2rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--m6-white);
}
.m6-prose a {
  color: var(--m6-cyan);
  text-decoration: underline;
  text-underline-offset: .2em;
}
.m6-prose ul, .m6-prose ol { padding-left: 1.25em; }
.m6-prose ul { list-style: square; }
.m6-prose ol { list-style: decimal; }
.m6-prose li + li { margin-top: .4em; }
.m6-prose strong { color: var(--m6-white); }
.m6-prose blockquote {
  padding-left: 1em;
  border-left: 3px solid var(--m6-orange);
  color: var(--m6-steel);
}
.m6-prose code {
  padding: 1px 5px;
  font-family: var(--m6-font-mono);
  font-size: .88em;
  color: var(--m6-lime);
  background: rgba(183, 243, 74, .08);
}
.m6-prose--paper {
  max-width: 760px;
  padding: clamp(24px, 4vw, 48px);
  background: var(--m6-paper);
  color: #161009;
  border-left: 4px solid var(--m6-orange);
}
.m6-prose--paper h2, .m6-prose--paper h3, .m6-prose--paper strong { color: #161009; }
.m6-prose--paper a { color: #B2331A; }
.m6-prose--paper blockquote { color: #4D4234; border-left-color: #B2331A; }
.m6-prose--paper code { color: #33510A; background: rgba(51, 81, 10, .1); }

/* ===== 标签 / 数据 ===== */
.m6-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border: 1px solid rgba(34, 211, 238, .4);
  color: var(--m6-cyan);
  font-family: var(--m6-font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  line-height: 1.5;
}
.m6-tag--signal { border-color: rgba(255, 90, 54, .55); color: var(--m6-orange); }
.m6-tag--lime { border-color: rgba(183, 243, 74, .45); color: var(--m6-lime); }
.m6-stat {
  display: block;
  font-family: var(--m6-font-mono);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--m6-lime);
}
.m6-stat--cyan { color: var(--m6-cyan); }
.m6-stat-label {
  display: block;
  margin-top: 8px;
  font-family: var(--m6-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--m6-steel);
}

/* ===== 提示条 ===== */
.m6-callout {
  padding: 16px 20px;
  border: 1px solid var(--m6-grid);
  border-left: 3px solid var(--m6-cyan);
  background: rgba(34, 211, 238, .06);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(234, 244, 255, .86);
}
.m6-callout--signal {
  border-left-color: var(--m6-orange);
  background: rgba(255, 90, 54, .07);
}

/* ===== 数据表 ===== */
.m6-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.m6-table th,
.m6-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--m6-grid);
}
.m6-table th {
  font-family: var(--m6-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--m6-steel);
}
.m6-table td { color: var(--m6-white); }
.m6-table--numeric td:not(:first-child) {
  font-family: var(--m6-font-mono);
}

/* ===== 横向滚动条带 ===== */
.m6-scroll-x {
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--m6-grid) transparent;
  padding-bottom: 4px;
}
.m6-scroll-x::-webkit-scrollbar { height: 6px; }
.m6-scroll-x::-webkit-scrollbar-track { background: transparent; }
.m6-scroll-x::-webkit-scrollbar-thumb { background: var(--m6-grid); }

/* ===== 响应式 ===== */
@media (max-width: 1180px) {
  .m6-nav__link { padding: 0 8px; font-size: 13px; letter-spacing: .03em; }
  .m6-nav__link::after { left: 8px; right: 8px; }
}

@media (max-width: 1024px) {
  .m6-burger { display: inline-flex; }
  .m6-header__inner { gap: 12px; }
  .m6-header__actions { margin-left: auto; }
  .m6-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    margin: 0;
    padding: 10px clamp(16px, 4vw, 40px) 26px;
    background: var(--m6-ink-2);
    border-top: 1px solid var(--m6-grid);
    border-bottom: 1px solid var(--m6-grid);
    box-shadow: 0 24px 40px rgba(0, 0, 0, .4);
    max-height: calc(100dvh - var(--m6-header-h));
    overflow-y: auto;
  }
  .m6-header[data-open] .m6-nav { display: block; }
  .m6-header[data-open] { background-color: var(--m6-ink-2); }
  .m6-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .m6-nav__link {
    display: block;
    min-height: 0;
    padding: 15px 0;
    border-bottom: 1px solid rgba(30, 51, 80, .65);
    font-size: 15px;
    letter-spacing: .06em;
  }
  .m6-nav__link::after { display: none; }
  .m6-nav__link[aria-current="page"] { color: var(--m6-cyan); }
}

@media (max-width: 960px) {
  .m6-grid--3,
  .m6-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .m6-grid--split { grid-template-columns: minmax(0, 1fr); }
  .m6-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .m6-toc { position: static; }
}

@media (max-width: 900px) {
  .m6-header__actions .m6-btn--ghost { display: none; }
}

@media (max-width: 640px) {
  :root { --m6-header-h: 66px; }
  .m6-brand__mark { width: 36px; height: 36px; font-size: 13px; }
  .m6-brand__name { font-size: 17px; }
  .m6-brand__sub { display: none; }
  .m6-header__actions .m6-btn--signal { min-height: 38px; padding: 0 12px; font-size: 12px; }
  .m6-grid--2,
  .m6-grid--3,
  .m6-grid--4 { grid-template-columns: minmax(0, 1fr); }
  .m6-footer__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }
  .m6-footer__base { justify-content: flex-start; }
  .m6-prose { font-size: 16px; }
}

@media (max-width: 380px) {
  .m6-header__actions .m6-btn--signal { padding: 0 9px; letter-spacing: 0; }
  .m6-brand { gap: 8px; }
  .m6-brand__name { font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  .m6-btn:hover,
  .m6-panel:hover { transform: none; }
}