/* ==========================================================================
   九洲 wide-jiuzhou.com.cn · 共享样式表  /assets/site.css
   骨：月白留白 + 墨黑 1px 框架线 ｜ 肉：黛青 / 赭石分区 ｜ 锚点：朱砂橙
   ========================================================================== */

/* --- 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, figure, blockquote,
dl, dd, ul, ol { margin: 0; }

ul, ol { padding: 0; }

img, svg, video { display: block; max-width: 100%; height: auto; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
}

table { border-collapse: collapse; width: 100%; }

/* --- 2. 设计变量 -------------------------------------------------------- */
:root {
  /* 色彩 */
  --ink: #101418;
  --ink-soft: rgba(16, 20, 24, .64);
  --ink-line: rgba(16, 20, 24, .14);
  --ink-line-strong: rgba(16, 20, 24, .30);

  --moon: #F4F1EA;
  --paper: #FFFFFF;

  --dai: #1F4E5F;
  --dai-deep: #0E2E3A;

  --ochre: #8C5A3C;

  --cinnabar: #E4572E;
  --cinnabar-deep: #B23A18;

  --mist: #C9C6BD;
  --moss: #3E6B4F;

  /* 字体 */
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* 字阶：12 / 13 / 17 / 22 / 34 / 56 / 88 */
  --fs-12: .75rem;
  --fs-13: .8125rem;
  --fs-17: 1.0625rem;
  --fs-22: 1.375rem;
  --fs-34: 2.125rem;
  --fs-56: 3.5rem;
  --fs-88: 5.5rem;

  /* 尺寸与节奏 */
  --header-h: 4.5rem;
  --frame-edge: clamp(1rem, 3vw, 2.5rem);
  --gutter: clamp(1.25rem, 6vw, 6rem);
  --radius: 2px;
  --ease: cubic-bezier(.2, .7, .3, 1);

  --shadow-1: 0 1px 2px rgba(16, 20, 24, .05), 0 14px 30px -22px rgba(16, 20, 24, .40);
  --shadow-2: 0 2px 6px rgba(16, 20, 24, .08), 0 26px 50px -24px rgba(16, 20, 24, .48);
}

/* --- 3. 基础排版 -------------------------------------------------------- */
body {
  min-height: 100%;
  background-color: var(--moon);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.9;
  padding-top: var(--header-h);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.05;
}

a {
  color: inherit;
  text-decoration: none;
}

p { margin: 0 0 1.2em; }
p:last-child { margin-bottom: 0; }

strong, b { font-weight: 800; }

.prose {
  max-width: 34em;
  font-size: var(--fs-17);
  line-height: 1.9;
}

.prose h2,
.prose h3 { margin: 1.6em 0 .6em; }

.prose ul,
.prose ol { margin: 0 0 1.2em; padding-left: 1.3em; }

.prose li { margin-bottom: .35em; }

.prose a {
  color: var(--cinnabar-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose a:hover { text-decoration-thickness: 2px; }

.display-1 { font-size: clamp(2.75rem, 8vw, var(--fs-88)); }
.display-2 { font-size: clamp(2rem, 5.5vw, var(--fs-56)); }
.display-3 { font-size: clamp(1.5rem, 3.4vw, var(--fs-34)); }

#main-content { scroll-margin-top: calc(var(--header-h) + 1rem); }

/* --- 4. 页面框架线（左右各 1px 墨线，导航即边框） ----------------------- */
body::before,
body::after {
  content: "";
  position: fixed;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--ink-line-strong);
  z-index: 70;
  pointer-events: none;
}

body::before { left: var(--frame-edge); }
body::after { right: var(--frame-edge); }

/* --- 5. Skip link ------------------------------------------------------- */
.skip-link {
  position: fixed;
  top: .5rem;
  left: .5rem;
  z-index: 200;
  transform: translateY(-260%);
  padding: .7em 1.1em;
  background: var(--ink);
  color: var(--moon);
  font-family: var(--font-display);
  font-size: var(--fs-13);
  font-weight: 800;
  letter-spacing: .04em;
  border-radius: var(--radius);
  transition: transform .18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--cinnabar);
  outline-offset: 2px;
}

/* --- 6. 页头：框架式导航 ------------------------------------------------ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 60;
  background: rgba(244, 241, 234, .86);
  -webkit-backdrop-filter: blur(10px) saturate(130%);
  backdrop-filter: blur(10px) saturate(130%);
  border-top: 1px solid var(--ink-line-strong);
  border-bottom: 1px solid var(--ink-line-strong);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.site-header[data-scrolled] {
  background: rgba(244, 241, 234, .95);
  box-shadow: 0 14px 34px -28px rgba(16, 20, 24, .65);
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--cinnabar);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .1s linear;
  pointer-events: none;
}

.header-bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: stretch;
  height: 100%;
  padding-inline: var(--frame-edge);
}

/* 品牌 */
.brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: .1rem;
  padding-right: 1.4rem;
  border-right: 1px solid var(--ink-line);
  color: var(--ink);
  transition: color .18s var(--ease);
}

.brand:hover .brand-mark { color: var(--cinnabar-deep); }

.brand-mark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-22);
  letter-spacing: -.01em;
  line-height: 1.15;
  transition: color .18s var(--ease);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  line-height: 1.3;
  color: var(--ink-soft);
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: stretch;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: stretch;
  gap: .1rem;
  padding: 0 1rem;
  list-style: none;
}

.nav-item { display: flex; }

.nav-link {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 .8rem;
  font-family: var(--font-display);
  font-size: var(--fs-13);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink);
  border-bottom: 2px solid transparent;
  transition: color .18s var(--ease), background .18s var(--ease), border-color .18s var(--ease);
}

.nav-link:hover {
  background: rgba(255, 255, 255, .72);
  border-bottom-color: var(--ochre);
}

.nav-link--primary { font-weight: 800; }

.nav-link[aria-current="page"] {
  color: var(--cinnabar-deep);
  border-bottom-color: var(--cinnabar);
}

.nav-link[aria-current="page"]:hover { border-bottom-color: var(--cinnabar); }

/* 工具区 */
.header-utility {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding-left: 1.4rem;
  border-left: 1px solid var(--ink-line);
}

.utility-hours {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .05em;
  color: var(--ink-soft);
  white-space: nowrap;
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  height: 2.5rem;
  padding: 0 .85rem;
  border: 1px solid var(--ink-line-strong);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .6);
  cursor: pointer;
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

.nav-toggle:hover { border-color: var(--cinnabar); background: var(--paper); }

.nav-toggle-bar {
  display: block;
  width: 1rem;
  height: 2px;
  margin-left: -1.6rem;
  background: var(--ink);
  transform: translateX(1.6rem);
}

.nav-toggle-bar + .nav-toggle-bar { margin-top: .28rem; }

.nav-toggle-label {
  font-family: var(--font-display);
  font-size: var(--fs-13);
  font-weight: 800;
  letter-spacing: .04em;
}

/* --- 7. 按钮 ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  min-height: 2.5rem;
  padding: .7em 1.15em;
  font-family: var(--font-display);
  font-size: var(--fs-13);
  font-weight: 800;
  letter-spacing: .04em;
  line-height: 1;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease), box-shadow .18s var(--ease);
}

.btn:hover {
  background: var(--ink);
  color: var(--moon);
  transform: translateY(-1px);
}

.btn--line {
  border-color: var(--ink-line-strong);
  background: rgba(255, 255, 255, .55);
}

.btn--line:hover {
  background: var(--paper);
  border-color: var(--cinnabar);
  color: var(--cinnabar-deep);
}

.btn--cinnabar {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: #FFFFFF;
}

.btn--cinnabar:hover {
  background: var(--cinnabar-deep);
  border-color: var(--cinnabar-deep);
  color: #FFFFFF;
  box-shadow: 0 10px 24px -14px rgba(178, 58, 24, .8);
}

/* --- 8. 页脚：整幅深色分区 ---------------------------------------------- */
.site-footer {
  margin-top: clamp(3.5rem, 9vw, 7rem);
  background: var(--dai-deep);
  color: var(--moon);
  border-top: 1px solid var(--ink);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(0, 1.4fr);
  gap: clamp(2rem, 5vw, 4rem);
  padding: clamp(2.5rem, 6vw, 4.5rem) var(--frame-edge);
  border-bottom: 1px solid rgba(244, 241, 234, .14);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
}

.brand--invert {
  flex-direction: row;
  align-items: baseline;
  gap: .75rem;
  padding-right: 0;
  border-right: 0;
  color: var(--moon);
}

.brand--invert .brand-mark { font-size: var(--fs-34); }
.brand--invert .brand-sub { color: rgba(244, 241, 234, .55); }
.brand--invert:hover .brand-mark { color: var(--cinnabar); }

.footer-lead {
  max-width: 30ch;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: rgba(244, 241, 234, .76);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}

.footer-col-title {
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--mist);
}

.footer-col-title::after {
  content: "";
  display: block;
  width: 1.5rem;
  height: 2px;
  margin-top: .6rem;
  background: var(--ochre);
}

.footer-list {
  display: grid;
  gap: .45rem;
  list-style: none;
}

.footer-list a {
  display: inline-block;
  font-size: var(--fs-13);
  color: rgba(244, 241, 234, .84);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.footer-list a:hover {
  color: #FFFFFF;
  border-bottom-color: var(--cinnabar);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.5rem 2rem;
  padding: clamp(1.75rem, 4vw, 2.5rem) var(--frame-edge);
  border-bottom: 1px solid rgba(244, 241, 234, .14);
}

.contact-item { margin: 0; }

.contact-label {
  display: block;
  margin-bottom: .45rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--mist);
}

.contact-value {
  font-size: var(--fs-13);
  line-height: 1.7;
  color: rgba(244, 241, 234, .92);
}

.copy-chip {
  display: inline-flex;
  align-items: baseline;
  gap: .55rem;
  padding: .45em .8em;
  background: rgba(244, 241, 234, .06);
  border: 1px solid rgba(244, 241, 234, .22);
  border-radius: var(--radius);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: .04em;
  cursor: pointer;
  transition: background .18s var(--ease), border-color .18s var(--ease);
}

.copy-chip:hover {
  background: rgba(228, 87, 46, .18);
  border-color: var(--cinnabar);
}

.copy-chip-hint {
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: rgba(244, 241, 234, .58);
}

.copy-chip[data-copied] {
  border-color: var(--moss);
  background: rgba(62, 107, 79, .28);
}

.copy-chip[data-copied] .copy-chip-hint { color: #A8D8B6; }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1.5rem;
  padding: 1.25rem var(--frame-edge) calc(1.5rem + env(safe-area-inset-bottom, 0px));
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: rgba(244, 241, 234, .46);
}

.footer-base p { margin: 0; }

/* --- 9. 布局工具 -------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-7 { grid-column: span 7; }
.col-12 { grid-column: span 12; }

.rule {
  height: 1px;
  background: var(--ink-line-strong);
  border: 0;
  margin: clamp(2rem, 5vw, 3.5rem) 0;
}

/* --- 10. 组件 ----------------------------------------------------------- */
.eyebrow {
  display: inline-block;
  margin-bottom: .9rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ochre);
}

.section-head {
  padding-bottom: 1.1rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--ink-line-strong);
}

.section-head__title { font-size: clamp(1.5rem, 3.2vw, var(--fs-34)); }

.section-head__lead {
  max-width: 34em;
  margin-top: .75rem;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--ink-soft);
}

/* 展签牌 */
.plate {
  position: relative;
  display: block;
  padding: clamp(1.1rem, 2.4vw, 1.75rem);
  background: var(--paper);
  border: 1px solid var(--ink-line);
  border-left: 3px solid var(--ochre);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-left-color .2s var(--ease);
}

a.plate:hover,
a.plate:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-left-color: var(--cinnabar);
}

.plate__index {
  display: block;
  margin-bottom: .6rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--ochre);
}

.plate__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-22);
  letter-spacing: -.01em;
  line-height: 1.25;
}

.plate__note {
  margin-top: .55rem;
  font-size: var(--fs-13);
  line-height: 1.75;
  color: var(--ink-soft);
}

.plate--invert {
  background: var(--dai-deep);
  border-color: transparent;
  border-left-color: var(--cinnabar);
  color: var(--moon);
  box-shadow: none;
}

.plate--invert .plate__title { color: var(--moon); }
.plate--invert .plate__note { color: rgba(244, 241, 234, .72); }
.plate--invert .plate__index { color: var(--mist); }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  padding: .25em .7em;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  border: 1px solid var(--ink-line-strong);
  border-radius: 999px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, .6);
}

.tag--ochre { border-color: var(--ochre); color: var(--ochre); background: rgba(140, 90, 60, .08); }
.tag--moss { border-color: var(--moss); color: var(--moss); background: rgba(62, 107, 79, .10); }
.tag--cinnabar { border-color: var(--cinnabar); color: var(--cinnabar-deep); background: rgba(228, 87, 46, .10); }

/* 图片容器 */
.frame-media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius);
}

.frame-media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.frame-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, rgba(16, 20, 24, .07) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(to bottom, rgba(16, 20, 24, .07) 0 1px, transparent 1px 48px);
}

.frame-media--wide { aspect-ratio: 21 / 9; }
.frame-media--tall { aspect-ratio: 3 / 4; }
.frame-media--square { aspect-ratio: 1 / 1; }

.frame-media__caption {
  display: block;
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--ink-soft);
}

/* --- 11. 焦点与减弱动效 ------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 2px;
  border-radius: 1px;
}

.nav-link:focus-visible { outline-offset: -3px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .plate:hover,
  a.plate:hover,
  .btn:hover { transform: none; }
}

/* --- 12. 响应式 --------------------------------------------------------- */
@media (max-width: 1080px) {
  .utility-hours { display: none; }
  .footer-top { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  :root { --header-h: 3.75rem; }

  body::before,
  body::after { display: none; }

  .header-bar { grid-template-columns: auto 1fr; }

  .header-utility {
    justify-content: flex-end;
    margin-left: auto;
    padding-left: 0;
    border-left: 0;
  }

  .header-utility .btn--line { display: none; }

  .brand { border-right: 0; padding-right: 0; }

  /* 导航折叠为底部横向滑动框架条 */
  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 80;
    display: block;
    background: var(--dai-deep);
    border-top: 1px solid var(--edgeless, #101418);
    transform: translateY(112%);
    transition: transform .26s var(--ease);
    box-shadow: 0 -20px 44px -26px rgba(16, 20, 24, .7);
  }

  .site-nav[data-open] { transform: translateY(0); }

  .nav-list {
    display: flex;
    gap: .5rem;
    padding: .85rem 1rem calc(1rem + env(safe-area-inset-bottom, 0px));
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
  }

  .nav-item { flex: 0 0 auto; }

  .nav-link {
    height: auto;
    padding: .6em 1em;
    color: var(--moon);
    font-size: var(--fs-13);
    white-space: nowrap;
    border: 1px solid rgba(244, 241, 234, .28);
    border-radius: 999px;
    transition: background .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease);
  }

  .nav-link:hover {
    background: rgba(244, 241, 234, .12);
    border-color: var(--cinnabar);
    border-bottom-color: var(--cinnabar);
  }

  .nav-link[aria-current="page"] {
    background: var(--cinnabar);
    border-color: var(--cinnabar);
    color: #FFFFFF;
  }

  .nav-toggle { display: inline-flex; }

  .grid > [class*="col-"] { grid-column: span 12; }

  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .footer-cols { grid-template-columns: 1fr; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .copy-chip { width: 100%; justify-content: space-between; }
}

@media (min-width: 1000px) {
  .contact-item--wide { grid-column: 1 / -1; }
}