/* ===========================================================
   优游中心 / assets/site.css
   共享层：重置、变量、中文排版、头部、页脚、通用组件
   =========================================================== */

/* ---------- 变量 ---------- */
:root {
  --mist-deep: #1F3A4D;
  --mist-mid: #2E5D73;
  --mist-light: #5C8FA3;
  --mist-wash: #C9DDE4;
  --sand-light: #F4EAD8;
  --sand-mid: #E4CFA8;
  --sand-deep: #B8925A;
  --signal: #E86F3A;
  --ink: #172026;
  --paper: #FBF7F0;
  --archive: #1F5C4A;
  --wine: #8E3B4A;

  --font-display: "Archivo Narrow", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --wrap: 1220px;
  --shadow-hard: 4px 4px 0 var(--mist-deep);
  --shadow-sand: 5px 5px 0 var(--sand-mid);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --header-h: 88px;
}

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

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

body {
  margin: 0;
  padding-top: var(--header-h);
  background-color: var(--sand-light);
  background-image:
    linear-gradient(180deg, rgba(201, 221, 228, .55) 0, rgba(201, 221, 228, 0) 320px),
    linear-gradient(90deg, rgba(184, 146, 90, .10) 0 1px, transparent 1px);
  background-size: auto, 100% auto;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .012em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding-left: 1.15em; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--mist-mid); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--signal); }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; border-top: 1px solid var(--mist-light); margin: 2.5rem 0; }

h1 { font-family: var(--font-display); font-weight: 700; font-size: clamp(32px, 5vw, 56px); line-height: 1.14; letter-spacing: -.005em; }
h2 { font-family: var(--font-display); font-weight: 700; font-size: clamp(24px, 3vw, 32px); line-height: 1.22; }
h3 { font-weight: 650; font-size: 19px; line-height: 1.35; }
h4 { font-weight: 650; font-size: 16px; }

p { margin-bottom: 1em; }
p:last-child { margin-bottom: 0; }

[id] { scroll-margin-top: 118px; }

:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ---------- 无障碍工具类 ---------- */
.sr-only,
.nav-toggle-label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 999;
  padding: 10px 18px;
  background: var(--signal);
  color: #fff;
  font-weight: 650;
  font-size: 14px;
  border-radius: 999px;
  text-decoration: none;
  border: 2px solid var(--mist-deep);
  box-shadow: var(--shadow-hard);
  transform: translateY(-160%);
  transition: transform .2s var(--ease);
}
.skip-link:focus {
  transform: translateY(0);
  color: #fff;
}

/* ---------- 容器 ---------- */
.wrap {
  width: min(var(--wrap), 100% - 40px);
  margin-inline: auto;
}

/* ---------- 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  padding: 12px 0 0;
  transition: transform .32s var(--ease);
}
.site-header.is-hidden { transform: translateY(-145%); }

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(31, 58, 77, .16);
  pointer-events: none;
  z-index: 70;
}
.reading-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--signal);
  transition: width .12s linear;
}

.header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

/* 品牌浮岛 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px 7px 8px;
  background: var(--paper);
  border: 2px solid var(--mist-deep);
  border-radius: 999px;
  box-shadow: 3px 3px 0 var(--mist-deep);
  text-decoration: none;
  color: var(--mist-deep);
  flex: 0 0 auto;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease);
}
.brand:hover {
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 var(--mist-deep);
  color: var(--mist-deep);
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--mist-deep);
  color: var(--sand-light);
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .04em;
}
.brand-tag {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mist-mid);
  white-space: nowrap;
}

/* 导航胶囊 */
.nav-pill {
  background: var(--mist-deep);
  border-radius: 999px;
  padding: 5px;
  box-shadow: 3px 3px 0 rgba(184, 146, 90, .75);
  flex: 0 1 auto;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-link {
  display: block;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--sand-light);
  font-size: 14.5px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.nav-link:hover {
  background: rgba(244, 234, 216, .16);
  color: var(--paper);
}
.nav-link[aria-current="page"] {
  background: var(--signal);
  color: #fff;
  font-weight: 650;
}

/* 右侧行动区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}
.header-cta {
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  background: var(--signal);
  color: #fff;
  font-size: 14.5px;
  font-weight: 650;
  letter-spacing: .02em;
  text-decoration: none;
  border: 2px solid var(--mist-deep);
  border-radius: 999px;
  box-shadow: 3px 3px 0 var(--mist-deep);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease);
}
.header-cta:hover {
  color: #fff;
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 var(--mist-deep);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 46px;
  height: 46px;
  padding: 0;
  background: var(--paper);
  border: 2px solid var(--mist-deep);
  border-radius: 999px;
  box-shadow: 3px 3px 0 var(--mist-deep);
  cursor: pointer;
}
.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--mist-deep);
  border-radius: 2px;
  transition: transform .22s var(--ease), opacity .18s linear;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 120px);
  padding-bottom: 30px;
  background: var(--mist-deep);
  color: var(--sand-light);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background-image: repeating-linear-gradient(90deg, var(--sand-deep) 0 14px, transparent 14px 28px);
  opacity: .6;
}
.footer-shell { padding-top: 56px; }

.footer-grid {
  display: grid;
  grid-template-columns: minmax(230px, 1.5fr) minmax(150px, 1fr) minmax(150px, 1fr);
  gap: 34px 44px;
  padding-bottom: 38px;
  border-bottom: 1px solid rgba(244, 234, 216, .2);
}
.footer-block { min-width: 0; }
.footer-brand {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--paper);
  margin-bottom: 6px;
}
.footer-tag {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--sand-deep);
  margin-bottom: 12px;
}
.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 234, 216, .78);
  max-width: 34ch;
}
.footer-title {
  font-family: var(--font-display);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--sand-mid);
  margin-bottom: 14px;
}
.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}
.footer-link {
  color: var(--sand-light);
  font-size: 14.5px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.footer-link:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

/* 联系层 */
.footer-contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px 34px;
  padding: 32px 0;
  border-bottom: 1px solid rgba(244, 234, 216, .2);
}
.footer-copy,
.footer-static {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  text-align: left;
}
.footer-copy {
  padding: 0;
  margin: 0;
  background: none;
  border: 0;
  cursor: pointer;
}
.footer-copy-label {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--sand-mid);
}
.footer-copy-value {
  font-family: var(--font-mono);
  font-size: 14.5px;
  letter-spacing: .01em;
  color: var(--paper);
  border-bottom: 1px dashed transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
  word-break: break-word;
}
.footer-static .footer-copy-value {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  border-bottom: 0;
}
.footer-copy:hover .footer-copy-value,
.footer-copy.is-copied .footer-copy-value {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.footer-notes {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 28px;
  padding: 20px 0 4px;
}
.footer-note {
  font-size: 13.5px;
  color: rgba(244, 234, 216, .72);
}
.footer-status {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
  min-height: 1em;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 28px;
  padding-top: 24px;
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-legal .footer-link { font-size: 13.5px; }
.footer-meta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: rgba(244, 234, 216, .68);
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 15.5px;
  font-weight: 650;
  letter-spacing: .02em;
  text-decoration: none;
  border: 2px solid var(--mist-deep);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), background-color .18s var(--ease);
}
.btn-signal {
  background: var(--signal);
  color: #fff;
  box-shadow: 4px 4px 0 var(--mist-deep);
}
.btn-signal:hover {
  color: #fff;
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--mist-deep);
}
.btn-line {
  background: var(--paper);
  color: var(--mist-deep);
  box-shadow: 4px 4px 0 var(--sand-mid);
}
.btn-line:hover {
  color: var(--mist-deep);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--sand-deep);
}

/* ---------- 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist-mid);
  padding: 0;
  margin: 0;
  list-style: none;
}
.crumbs a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dashed var(--mist-light);
}
.crumbs a:hover { color: var(--signal); border-bottom-color: var(--signal); }
.crumb-sep { color: var(--sand-deep); }
.crumb-current { color: var(--ink); font-weight: 600; }

/* ---------- 章节骨架 ---------- */
.section { padding-block: clamp(48px, 7vw, 96px); }
.section-head { max-width: 68ch; margin-bottom: clamp(24px, 3.5vw, 44px); }
.section-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--mist-mid);
  margin-bottom: 12px;
}
.section-title { color: var(--mist-deep); }
.section-lede {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist-mid);
  margin-top: 14px;
  max-width: 62ch;
}

/* ---------- 图片容器 ---------- */
.figure { margin: 0; }
.figure-frame {
  position: relative;
  border: 2px solid var(--mist-deep);
  border-radius: 6px;
  background: var(--paper);
  box-shadow: var(--shadow-sand);
  overflow: hidden;
}
.figure-media {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background-color: var(--mist-wash);
  background-image:
    repeating-linear-gradient(135deg, rgba(31, 58, 77, .09) 0 10px, transparent 10px 20px),
    linear-gradient(160deg, var(--mist-wash) 0%, var(--sand-mid) 100%);
  background-size: 26px 26px, cover;
}
.figure-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .03em;
  color: var(--mist-mid);
}

/* ---------- 渐显 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}
.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 55;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  background: var(--paper);
  color: var(--mist-deep);
  border: 2px solid var(--mist-deep);
  border-radius: 50%;
  box-shadow: 3px 3px 0 var(--mist-deep);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 15px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s;
}
.to-top.is-shown {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }

  .nav-pill {
    position: fixed;
    top: 78px;
    left: 20px;
    right: 20px;
    padding: 10px;
    background: var(--paper);
    border: 2px solid var(--mist-deep);
    border-radius: 20px;
    box-shadow: 5px 5px 0 var(--mist-deep);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
    z-index: 65;
    max-height: min(70vh, 460px);
    overflow-y: auto;
  }
  .nav-pill[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }
  .nav-link {
    padding: 12px 16px;
    border-radius: 12px;
    color: var(--mist-deep);
    font-size: 16px;
  }
  .nav-link:hover {
    background: var(--sand-light);
    color: var(--mist-deep);
  }
  .nav-link[aria-current="page"] {
    background: var(--signal);
    color: #fff;
  }
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact { grid-template-columns: 1fr; gap: 20px; }
}

@media (max-width: 820px) {
  :root { --header-h: 80px; }
  .brand-tag { display: none; }
  .brand { padding: 6px 14px 6px 7px; }
}

@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .wrap { width: min(var(--wrap), 100% - 28px); }
  .header-cta { padding: 8px 14px; font-size: 14px; }
  .brand-name { font-size: 16px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-shell { padding-top: 48px; }
  .to-top { right: 14px; bottom: 18px; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .site-header.is-hidden { transform: none; }
}