/* =========================================================
   百家利会员主页 · 共享站点样式 /assets/site.css
   索引册体系：深墨蓝底床 / 暖米白纸面 / 朱砂红强调 / 铜金刻度
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body { margin: 0; }

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

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

button, input, select, textarea { font: inherit; color: inherit; }

button {
  background: none;
  border: 0;
  cursor: pointer;
}

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

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

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色彩 */
  --ink: #0E1A2B;
  --ink-2: #1B2E45;
  --paper: #F4EBDD;
  --paper-lift: #FBF6EE;
  --cinnabar: #B83A2A;
  --cinnabar-deep: #9C2F22;
  --copper: #B08A4F;
  --ash: #D8CFC0;
  --slate: #5E6F80;
  --deep: #11161D;
  --gold-light: #E8D8B8;

  /* 字体 */
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, "Times New Roman", serif;
  --font-body: "Noto Sans SC", "Source Han 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, monospace;

  /* 版式尺度 */
  --step-sm: 15px;
  --step-base: 17px;
  --step-lg: 28px;
  --step-xl: 40px;
  --step-2xl: 64px;

  /* 布局 */
  --shell: 1240px;
  --gutter: clamp(20px, 4vw, 64px);
  --header-h: 92px;
  --header-h-slim: 68px;
  --cut: 22px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--paper);
  color: var(--deep);
  font-family: var(--font-body);
  font-size: var(--step-base);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 0.015em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

strong { font-weight: 700; }

::selection {
  background: var(--gold-light);
  color: var(--ink);
}

main {
  display: block;
  padding-top: var(--header-h);
}

#main-content { scroll-margin-top: calc(var(--header-h) + 12px); }

/* ---------- 4. 布局与工具 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

/* ---------- 5. 焦点可见 ---------- */
:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
  border-radius: 2px;
}

.site-header :where(a, button):focus-visible,
.site-footer :where(a, button):focus-visible {
  outline-color: var(--gold-light);
}

.btn:focus-visible,
.nav-quick:focus-visible {
  outline: 2px dashed var(--gold-light);
  outline-offset: -7px;
}

/* ---------- 6. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 999;
  transform: translateY(-180%);
  padding: 11px 20px;
  background: var(--gold-light);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  border: 1px solid var(--copper);
  transition: transform 0.22s var(--ease);
}

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

/* ---------- 7. 站点头部 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  color: var(--paper);
  background-color: transparent;
  transition:
    background-color 0.35s var(--ease),
    box-shadow 0.35s var(--ease);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(to bottom, rgba(14, 26, 43, 0.62), rgba(14, 26, 43, 0));
  opacity: 1;
  transition: opacity 0.35s var(--ease);
}

.site-header[data-scrolled]::before,
.site-header[data-nav-open]::before { opacity: 0; }

.site-header[data-scrolled],
.site-header[data-nav-open] {
  background-color: var(--ink);
  box-shadow:
    0 1px 0 0 var(--copper),
    0 24px 48px -34px rgba(17, 22, 29, 0.95);
}

.header-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 22px;
  height: var(--header-h);
  transition: height 0.3s var(--ease);
}

.site-header[data-scrolled] .header-inner { height: var(--header-h-slim); }

/* 品牌锁 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  flex: 0 0 auto;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  background-color: var(--cinnabar);
  color: var(--paper-lift);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  transition: background-color 0.25s var(--ease);
}

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

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--paper-lift);
  white-space: nowrap;
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--copper);
  white-space: nowrap;
}

/* ---------- 8. 导航 ---------- */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2vw, 32px);
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(14px, 1.7vw, 28px);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 7px 0;
  font-size: 15px;
  letter-spacing: 0.05em;
  color: rgba(244, 235, 221, 0.76);
  transition: color 0.22s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background-color: var(--cinnabar);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--ease);
}

.nav-link:hover { color: var(--paper-lift); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--paper-lift); }
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background-color: var(--cinnabar);
}

.nav-quick {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background-color: var(--gold-light);
  border: 1px solid var(--copper);
  clip-path: polygon(0 0, 100% 0, 100% 68%, calc(100% - 14px) 100%, 0 100%);
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

/* 移动端按钮 */
.nav-toggle {
  position: relative;
  display: none;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  padding: 0;
  margin-left: auto;
  border: 1px solid rgba(244, 235, 221, 0.34);
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.nav-toggle:hover { border-color: var(--copper); }

.nav-toggle-bar {
  position: absolute;
  left: 11px;
  right: 11px;
  height: 1.5px;
  background-color: var(--paper-lift);
  transition: transform 0.28s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle-bar:nth-child(1) { top: 15px; }
.nav-toggle-bar:nth-child(2) { top: 21px; }
.nav-toggle-bar:nth-child(3) { top: 27px; }

.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); }

/* ---------- 9. 站点页脚 ---------- */
.site-footer {
  position: relative;
  background-color: var(--ink);
  color: rgba(244, 235, 221, 0.78);
  font-size: 15px;
  padding-top: clamp(48px, 7vw, 88px);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background-image: linear-gradient(90deg, transparent, var(--copper) 12%, var(--copper) 88%, transparent);
}

.footer-top {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(34px, 5vw, 76px);
  padding-bottom: clamp(34px, 4.5vw, 54px);
  border-bottom: 1px solid rgba(216, 207, 192, 0.18);
}

.footer-top::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 1px;
  height: 64px;
  background-image: linear-gradient(to bottom, var(--copper), transparent);
  opacity: 0.65;
}

.footer-note {
  margin-top: 22px;
  max-width: 36ch;
  color: rgba(244, 235, 221, 0.62);
  font-size: 14.5px;
  line-height: 1.9;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.footer-col-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 18px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--paper-lift);
}

.footer-col-no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--copper);
}

.footer-links li + li { margin-top: 11px; }

.footer-links a {
  display: inline-block;
  padding-bottom: 2px;
  color: rgba(244, 235, 221, 0.8);
  border-bottom: 1px solid transparent;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.footer-links a:hover {
  color: var(--gold-light);
  border-bottom-color: var(--copper);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px clamp(24px, 4vw, 56px);
  padding-block: clamp(26px, 3.6vw, 40px);
  border-bottom: 1px solid rgba(216, 207, 192, 0.18);
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--copper);
}

.contact-value {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.02em;
  color: rgba(244, 235, 221, 0.88);
  overflow-wrap: anywhere;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 28px;
  padding-block: 22px calc(24px + env(safe-area-inset-bottom, 0px));
}

.footer-legal,
.footer-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(244, 235, 221, 0.5);
}

/* ---------- 10. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-align: center;
  color: var(--paper-lift);
  background-color: var(--cinnabar);
  border: 1px solid var(--cinnabar);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

.btn--ghost {
  color: var(--ink);
  background-color: transparent;
  border-color: var(--copper);
}

.btn--ghost:hover {
  color: var(--paper-lift);
  background-color: var(--ink);
  border-color: var(--ink);
}

.btn--onink {
  color: var(--ink);
  background-color: var(--gold-light);
  border-color: var(--gold-light);
}

.btn--onink:hover {
  color: var(--ink);
  background-color: var(--paper-lift);
  border-color: var(--paper-lift);
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cinnabar);
  border-bottom: 1px solid currentColor;
  transition: color 0.22s var(--ease);
}

.link-more:hover { color: var(--cinnabar-deep); }

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--copper);
}

.breadcrumb a {
  color: var(--slate);
  transition: color 0.2s var(--ease);
}

.breadcrumb a:hover { color: var(--cinnabar); }

.breadcrumb [aria-current="page"] { color: var(--deep); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background-color: var(--gold-light);
  border: 1px solid rgba(176, 138, 79, 0.6);
}

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--paper { background-color: var(--paper); }
.section--paperlift { background-color: var(--paper-lift); }
.section--ink {
  background-color: var(--ink);
  color: var(--paper);
}

.grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* 图片容器基础 */
.figure {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  background-color: var(--ink-2);
  border: 1px solid rgba(176, 138, 79, 0.5);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.figure--4x3 { aspect-ratio: 4 / 3; }
.figure--3x2 { aspect-ratio: 3 / 2; }
.figure--1x1 { aspect-ratio: 1 / 1; }
.figure--16x9 { aspect-ratio: 16 / 9; }
.figure--tall { aspect-ratio: 3 / 4; }

.figure-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.07em;
  color: var(--slate);
}

.section--ink .figure-caption { color: rgba(244, 235, 221, 0.6); }

/* ---------- 11. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.5s var(--ease),
    transform 0.5s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

[data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

/* ---------- 12. 平板与桌面微调 ---------- */
@media (max-width: 1080px) {
  .nav-link { font-size: 14.5px; }
  .brand-name { font-size: 18px; }
  .brand-tag { font-size: 10.5px; letter-spacing: 0.16em; }
}

/* ---------- 13. 移动导航 ---------- */
@media (max-width: 1040px) {
  :root {
    --header-h: 68px;
    --header-h-slim: 68px;
  }

  .nav-toggle { display: block; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: block;
    margin-left: 0;
    padding: 6px var(--gutter) 26px;
    background-color: var(--ink);
    border-top: 1px solid rgba(176, 138, 79, 0.4);
    box-shadow: 0 32px 56px -34px rgba(17, 22, 29, 0.95);
    max-height: calc(100vh - var(--header-h));
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition:
      opacity 0.26s var(--ease),
      transform 0.26s var(--ease),
      visibility 0.26s var(--ease);
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-list li + li { border-top: 1px solid rgba(216, 207, 192, 0.12); }

  .nav-link {
    display: block;
    padding: 15px 0;
    font-size: 17px;
    letter-spacing: 0.06em;
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] {
    color: var(--gold-light);
    box-shadow: inset 3px 0 0 var(--cinnabar);
    padding-left: 14px;
  }

  .nav-quick {
    display: flex;
    width: 100%;
    margin-top: 20px;
    padding: 13px 18px;
    font-size: 13px;
  }
}

/* ---------- 14. 小屏 ---------- */
@media (max-width: 900px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-top::after { display: none; }
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--split,
  .grid--halves,
  .grid--thirds { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .footer-nav { gap: 26px; }
  .footer-contact { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .brand-mark { width: 36px; height: 36px; font-size: 18px; }
  .brand-name { font-size: 16.5px; letter-spacing: 0.03em; }
  .brand-tag { font-size: 10px; letter-spacing: 0.14em; }
  .btn { width: 100%; }
}

@media (max-width: 560px) {
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 15. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 16. 打印 ---------- */
@media print {
  .site-header,
  .skip-link,
  .nav-toggle { display: none !important; }

  main { padding-top: 0; }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

  .site-footer {
    background: #fff;
    color: #000;
    padding-top: 12pt;
  }

  .footer-links a,
  .contact-value,
  .footer-legal,
  .footer-meta { color: #000; }
}