/* =========================================================
   澳门新京葡站 · site.css
   夜墨底 / 档案绿 / 鎏金锚点 / 珊瑚升级 / 青蓝数据
   ========================================================= */

/* ---------- 1. RESET ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; }
button { background: none; border: 0; color: inherit; font: inherit; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 变量 ---------- */
:root {
  --night: #0A1C17;
  --archive: #10312A;
  --stratum: #17453A;
  --gold: #C9A227;
  --gold-soft: #EBD08A;
  --coral: #FF6B4A;
  --cyan: #46D0C8;
  --paper: #F4EFE3;
  --mist: #93A9A1;
  --cut-black: #050908;

  --line: rgba(201, 162, 39, .24);
  --line-soft: rgba(147, 169, 161, .18);
  --line-cyan: rgba(70, 208, 200, .32);
  --line-coral: rgba(255, 107, 74, .38);

  --font-display: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --shell: 1240px;
  --gutter: clamp(18px, 4vw, 44px);
  --header-h: 84px;
  --header-h-compact: 56px;
  --cut: 18px;
  --ease: cubic-bezier(.2, .7, .3, 1);
  --t-fast: 140ms;
  --t-base: 200ms;
}

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

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--night);
  background-image:
    radial-gradient(1000px 640px at 84% -10%, rgba(201, 162, 39, .10), transparent 62%),
    radial-gradient(820px 560px at 2% 0%, rgba(70, 208, 200, .07), transparent 66%),
    repeating-linear-gradient(to right, rgba(147, 169, 161, .05) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(to bottom, rgba(147, 169, 161, .05) 0 1px, transparent 1px 96px);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
}

#main-content { position: relative; z-index: 1; display: block; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: .02em;
  color: var(--paper);
}
h1 { font-size: clamp(40px, 7.2vw, 88px); }
h2 { font-size: clamp(30px, 4.4vw, 52px); }
h3 { font-size: clamp(21px, 2.6vw, 28px); }
h4 { font-size: clamp(18px, 2vw, 22px); }

p { max-width: 68ch; }
strong { color: var(--gold-soft); font-weight: 700; }

a { color: var(--gold-soft); text-decoration: none; transition: color var(--t-fast) var(--ease); }
a:hover { color: var(--cyan); }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.mono {
  font-family: var(--font-mono);
  font-size: .88em;
  letter-spacing: .12em;
  font-variant-numeric: tabular-nums;
}
.coord {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.mono span, .coord span { margin: 0 .15em; }

/* ---------- 4. 无障碍辅助 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  transform: translateY(-140%);
  padding: 10px 18px;
  background: var(--gold);
  color: var(--cut-black);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  transition: transform var(--t-base) var(--ease);
}
.skip-link:focus { transform: translateY(0); color: var(--cut-black); }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. 布局骨架 ---------- */
.container {
  width: min(calc(100% - var(--gutter) * 2), var(--shell));
  margin-inline: auto;
}
.section { padding-block: clamp(46px, 7vw, 96px); }
.section + .section { padding-top: 0; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: clamp(22px, 3vw, 40px);
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 16px;
}
.section-head__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.2vw, 48px);
  line-height: 1.1;
  letter-spacing: .02em;
}
.section-head__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
  max-width: 44ch;
  line-height: 1.9;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--gold);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 22px);
}
.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; }

.prose {
  max-width: 68ch;
  color: var(--paper);
  font-size: 17px;
  line-height: 1.78;
}
.prose p + p { margin-top: 1em; }
.prose h2 { font-size: clamp(26px, 3.4vw, 40px); margin: 1.6em 0 .6em; }
.prose h3 { font-size: clamp(20px, 2.4vw, 26px); margin: 1.4em 0 .5em; color: var(--gold-soft); }
.prose ul { padding-left: 0; margin: .8em 0; }
.prose li {
  position: relative;
  padding-left: 22px;
  margin: .45em 0;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0; top: .78em;
  width: 10px; height: 1px;
  background: var(--gold);
}
.prose blockquote {
  border-left: 2px solid var(--coral);
  padding-left: 18px;
  color: var(--mist);
  margin: 1.2em 0;
}

/* ---------- 6. 切角面板 ---------- */
.panel {
  --cut: 18px;
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: linear-gradient(155deg, rgba(23, 69, 58, .78), rgba(10, 28, 23, .94) 74%);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  box-shadow: inset 0 0 0 1px var(--line), inset 0 0 46px rgba(70, 208, 200, .05);
}
.panel::after,
.panel::before {
  content: "";
  position: absolute;
  width: var(--cut);
  height: var(--cut);
  pointer-events: none;
}
.panel::after {
  top: 0; right: 0;
  background: linear-gradient(to bottom left,
    transparent calc(50% - 1px), rgba(201, 162, 39, .6) 50%, transparent calc(50% + 1px));
}
.panel::before {
  bottom: 0; left: 0;
  background: linear-gradient(to bottom left,
    transparent calc(50% - 1px), rgba(201, 162, 39, .6) 50%, transparent calc(50% + 1px));
}

/* ---------- 7. 图片容器（页面阶段放入 <img>） ---------- */
.media {
  --cut: 16px;
  position: relative;
  overflow: hidden;
  display: block;
  background: linear-gradient(140deg, var(--stratum), var(--night) 78%);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  box-shadow: inset 0 0 0 1px var(--line-soft);
}
.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.04);
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--3x4 { aspect-ratio: 3 / 4; }
.media--wide { aspect-ratio: 21 / 9; }
.media__label {
  position: absolute;
  left: 0; bottom: 0;
  padding: 5px 12px;
  background: rgba(5, 9, 8, .78);
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid var(--line);
  background: rgba(16, 49, 42, .45);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 15px;
  letter-spacing: .04em;
  line-height: 1.4;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: background var(--t-base) var(--ease), color var(--t-base) var(--ease),
              border-color var(--t-base) var(--ease), transform var(--t-fast) var(--ease);
}
.btn:hover {
  background: rgba(201, 162, 39, .16);
  border-color: var(--gold);
  color: var(--gold-soft);
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline-offset: -3px; }
.btn--gold {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--cut-black);
  font-weight: 700;
}
.btn--gold:hover { background: var(--gold-soft); border-color: var(--gold-soft); color: var(--cut-black); }
.btn--coral {
  background: var(--coral);
  border-color: var(--coral);
  color: #1B0A05;
  font-weight: 700;
}
.btn--coral:hover { background: #FF866A; border-color: #FF866A; color: #1B0A05; }
.btn--sm { padding: 9px 16px; font-size: 13.5px; }

/* ---------- 9. 标签 / 图例 / 面包屑 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  background: rgba(23, 69, 58, .5);
  border: 1px solid var(--line-soft);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease);
}
.tag:hover { color: var(--paper); border-color: var(--gold); }
.tag:focus-visible { outline-offset: -3px; }
.tag.is-active,
.tag[aria-pressed="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--cut-black);
}
.tag--cyan { color: var(--cyan); border-color: var(--line-cyan); }
.tag--coral { color: var(--coral); border-color: var(--line-coral); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding: 12px 16px;
  border: 1px dashed var(--line-soft);
  background: rgba(16, 49, 42, .42);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--mist);
}
.legend__item { display: inline-flex; align-items: center; gap: 8px; }
.legend__key { width: 18px; height: 3px; background: var(--gold); }
.legend__key--cyan { background: var(--cyan); }
.legend__key--coral { background: var(--coral); }
.legend__key--dash {
  background: repeating-linear-gradient(to right, var(--mist) 0 4px, transparent 4px 8px);
}

.breadcrumb {
  padding-block: 18px;
  border-bottom: 1px solid var(--line-soft);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--mist);
}
.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(147, 169, 161, .5);
}
.breadcrumb a { color: var(--cyan); }
.breadcrumb a:hover { color: var(--gold-soft); }
.breadcrumb [aria-current="page"] { color: var(--paper); }

/* ---------- 10. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(10, 28, 23, .9);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 30px);
  width: min(calc(100% - var(--gutter) * 2), 1440px);
  margin-inline: auto;
  min-height: var(--header-h);
  padding-block: 10px;
  transition: min-height var(--t-base) var(--ease);
}
.site-header.is-compact .site-header__inner { min-height: var(--header-h-compact); padding-block: 6px; }
.site-header.is-compact::before { background: rgba(8, 22, 18, .96); }

.scroll-progress {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  z-index: 2;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(to right, var(--gold), var(--coral));
}

.brand {
  position: relative;
  z-index: 70;
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  flex: 0 0 auto;
  color: var(--paper);
}
.brand__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 1.9vw, 22px);
  letter-spacing: .08em;
  line-height: 1.1;
  transition: color var(--t-fast) var(--ease);
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .2em;
  color: var(--gold);
  line-height: 1;
}
.brand:hover .brand__mark { color: var(--gold-soft); }
.brand:hover .brand__sub { color: var(--coral); }

.site-header__rule {
  position: relative;
  flex: 1 1 auto;
  min-width: 24px;
  height: 12px;
  align-self: center;
  background-image: repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px 14px);
  opacity: .9;
}
.site-header__rule::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 50%;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--line), transparent);
}

.site-header__version {
  position: relative;
  z-index: 70;
  flex: 0 0 auto;
  padding: 4px 9px;
  border: 1px solid var(--line);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  white-space: nowrap;
  clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 7px, 100% 100%, 7px 100%, 0 calc(100% - 7px));
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.6vw, 26px);
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.4vw, 22px);
}
.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 2px;
  color: var(--paper);
  font-size: 15px;
  letter-spacing: .02em;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 2px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--t-base) var(--ease), background var(--t-base) var(--ease);
}
.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--mist);
  transition: color var(--t-fast) var(--ease);
}
.site-nav__link:hover { color: var(--gold-soft); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link:focus-visible { outline-offset: 3px; }
.site-nav__link[aria-current="page"] { color: var(--gold-soft); }
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  height: 2px;
  background: var(--coral);
}
.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--coral); }
.site-nav__note {
  display: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--mist);
  max-width: none;
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 12px;
  border: 1px solid var(--line);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.nav-toggle:hover { border-color: var(--gold); color: var(--gold-soft); }
.nav-toggle:focus-visible { outline-offset: -3px; }
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  width: 16px;
  height: 14px;
}
.nav-toggle__bars i {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform var(--t-base) var(--ease), opacity var(--t-fast) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

html[data-nav-open] body { overflow: hidden; }

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  padding: clamp(40px, 6vw, 76px) 0 26px;
  background: linear-gradient(180deg, #081814 0%, var(--night) 42%, #06110E 100%);
  color: var(--mist);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--gold) 30%, var(--coral) 70%, transparent);
  opacity: .55;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px 32px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line-soft);
}
.footer-top__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 32px);
  letter-spacing: .06em;
  color: var(--paper);
  max-width: none;
}
.footer-top__meta {
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist);
  max-width: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(14px, 1.8vw, 22px);
  margin-top: clamp(26px, 4vw, 42px);
}

.foot-panel {
  --cut: 14px;
  position: relative;
  padding: clamp(16px, 1.8vw, 22px);
  background: linear-gradient(160deg, rgba(23, 69, 58, .6), rgba(10, 28, 23, .9) 76%);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  box-shadow: inset 0 0 0 1px var(--line-soft);
}
.foot-panel::after {
  content: "";
  position: absolute;
  top: 0; right: 0;
  width: var(--cut);
  height: var(--cut);
  pointer-events: none;
  background: linear-gradient(to bottom left,
    transparent calc(50% - 1px), rgba(201, 162, 39, .5) 50%, transparent calc(50% + 1px));
}
.foot-panel__title {
  display: flex;
  align-items: baseline;
  gap: 9px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: .06em;
  color: var(--gold-soft);
  padding-bottom: 12px;
  margin-bottom: 10px;
  border-bottom: 1px dashed var(--line-soft);
}
.foot-panel__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gold);
}
.foot-list li {
  position: relative;
  padding: 7px 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--mist);
  word-break: break-word;
}
.foot-list li + li { border-top: 1px dashed rgba(147, 169, 161, .12); }
.foot-list a { color: var(--mist); }
.foot-list a::before {
  content: "▸";
  margin-right: 8px;
  color: rgba(201, 162, 39, .55);
  font-family: var(--font-mono);
  font-size: 11px;
  transition: color var(--t-fast) var(--ease);
}
.foot-list a:hover { color: var(--gold-soft); }
.foot-list a:hover::before { color: var(--coral); }
.foot-list--plain li { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .08em; }
.foot-list--plain li::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 1px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--cyan);
}
.foot-panel__note {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed rgba(147, 169, 161, .12);
  font-size: 12.5px;
  line-height: 1.75;
  color: rgba(147, 169, 161, .88);
  max-width: none;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 26px;
  margin-top: clamp(24px, 3vw, 36px);
  padding-top: 18px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--mist);
}
.footer-legal__copy { max-width: none; }
.footer-legal__links { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer-legal__links a { color: var(--mist); }
.footer-legal__links a:hover { color: var(--gold-soft); }

/* ---------- 12. 显现动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }
html:not(.has-js) [data-reveal] { opacity: 1; transform: none; }

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1099px) {
  .site-header__rule { display: none; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .span-7, .span-8 { grid-column: span 12; }
}

@media (max-width: 899px) {
  body { font-size: 16px; }
  .site-header__version { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 55;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 22px;
    padding: calc(var(--header-h) + 26px) var(--gutter) 44px;
    background: linear-gradient(165deg, var(--archive) 0%, var(--night) 72%);
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 48px), calc(100% - 48px) 100%, 0 100%);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease),
                visibility var(--t-base) linear;
  }
  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__item { border-bottom: 1px solid var(--line-soft); }
  .site-nav__link {
    justify-content: flex-start;
    width: 100%;
    padding: 17px 4px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 20px;
    letter-spacing: .04em;
  }
  .site-nav__link::after { bottom: 0; }
  .site-nav__idx { font-size: 12px; }
  .site-nav__link[aria-current="page"] { padding-left: 12px; }
  .site-nav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0; top: 50%;
    width: 4px; height: 22px;
    margin-top: -11px;
    background: var(--coral);
  }
  .site-nav__note {
    display: block;
    margin-top: auto;
    padding-top: 18px;
    border-top: 1px dashed var(--line-soft);
    font-size: 11.5px;
    line-height: 1.9;
  }
}

@media (max-width: 639px) {
  :root { --header-h: 68px; }
  .brand__sub { letter-spacing: .14em; font-size: 9px; }
  .footer-grid { grid-template-columns: 1fr; }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 12; }
  .footer-legal { flex-direction: column; align-items: flex-start; }
  .footer-top { align-items: flex-start; }
}

/* ---------- 14. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars i { transform: none; }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
  .site-nav { transform: none; }
}