/* =========================================================
   /assets/site.css — 鸿禾品牌站 共享样式
   深墨绿框景 / 暖砂分区 / 琥珀橙行动 / 等宽编号
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #14342B;
  --ink-2: #1E4A3D;
  --paper: #FBF8F2;
  --sand: #E8DCC8;
  --sand-l: #F4EDE1;
  --amber: #C26518;
  --amber-deep: #A85412;
  --line: #9FB2BC;
  --slate: #4C6470;
  --black: #101B17;

  --hair: 1px solid rgba(20, 52, 43, 0.16);
  --hair-soft: 1px solid rgba(20, 52, 43, 0.09);
  --radius: 2px;

  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, "Times New Roman", serif;
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --shell: 76rem;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

body {
  margin: 0;
  background-color: var(--paper);
  background-image: radial-gradient(circle at 1px 1px, rgba(20, 52, 43, 0.045) 1px, transparent 0);
  background-size: 6px 6px;
  color: var(--black);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul, ol { margin: 0; padding: 0; }

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

a { color: var(--ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }

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

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

[hidden] { display: none !important; }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: var(--radius);
}

#main-content { scroll-margin-top: 7rem; }

/* ---------- 3. 基础排版 ---------- */
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.display-1 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2.125rem, 5vw, 4rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.section-title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.3rem, 2.4vw, 1.8rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.lede {
  font-size: clamp(1rem, 1.3vw, 1.125rem);
  line-height: 1.8;
  color: var(--slate);
  max-width: 36em;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--slate);
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 2rem;
  height: 1px;
  background: var(--amber);
}

.num-mark {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.prose { max-width: 38em; }
.prose > * + * { margin-top: 1.1em; }
.prose p { color: var(--black); }
.prose h2,
.prose h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
}
.prose h2 { font-size: clamp(1.35rem, 2.2vw, 1.7rem); }
.prose h3 { font-size: clamp(1.1rem, 1.7vw, 1.3rem); }
.prose ul,
.prose ol { padding-inline-start: 1.3em; }
.prose li + li { margin-top: 0.35em; }
.prose a { color: var(--ink); text-decoration-color: var(--amber); }

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

.section { padding-block: clamp(2.5rem, 6vw, 5rem); }
.section--sand { background: var(--sand); }
.section--sand-l { background: var(--sand-l); }

.section--ink {
  background: var(--ink);
  color: var(--sand);
}
.section--ink .section-title,
.section--ink .display-1 { color: var(--paper); }
.section--ink .lede { color: rgba(232, 220, 200, 0.78); }
.section--ink .eyebrow { color: rgba(232, 220, 200, 0.7); }

.grid { display: grid; gap: clamp(1rem, 2.5vw, 2rem); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 5. Skip link ---------- */
.skip-link {
  position: absolute;
  top: 0.5rem;
  left: var(--gutter);
  z-index: 200;
  display: inline-block;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--paper);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-radius: var(--radius);
  transform: translateY(-180%);
  transition: transform 0.18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  color: var(--paper);
}

/* ---------- 6. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--paper);
  border-bottom: 1px solid rgba(20, 52, 43, 0.14);
  box-shadow: 0 1px 0 rgba(20, 52, 43, 0.05);
}

/* 顶部细条：期号 + 响应时效 */
.header-ribbon {
  background: var(--ink);
  color: var(--sand);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
}

.ribbon-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 2.05rem;
  padding-block: 0.2rem;
}

.ribbon-issue {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--paper);
  white-space: nowrap;
}

.ribbon-issue .mono {
  color: var(--sand);
  letter-spacing: 0.12em;
}

.ribbon-dot {
  display: inline-block;
  width: 0.3rem;
  height: 0.3rem;
  border-radius: 50%;
  background: var(--amber);
}

.ribbon-note {
  color: rgba(232, 220, 200, 0.72);
  text-align: right;
}

/* 主行：品牌 + 双层导航 + 行动区 */
.header-main { padding-block: 0.65rem; }

.header-main-inner {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2.5vw, 2rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: none;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.45rem;
  height: 2.45rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1;
  border-radius: var(--radius);
}

.brand-name {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.35rem;
  line-height: 1.1;
  letter-spacing: 0.1em;
}

.brand-sub {
  display: block;
  margin-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  color: var(--slate);
}

/* 双层导航：上层说明条 + 下层栏目抽屉 */
.nav-dock {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
  padding-inline-start: clamp(0.5rem, 2vw, 1.5rem);
}

.nav-meta {
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--slate);
  padding-inline-start: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.primary-nav { min-width: 0; }

.nav-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.1rem;
  list-style: none;
}

.nav-list a {
  display: block;
  padding: 0.42rem 0.78rem;
  font-size: 0.93rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  border-left: 2px solid transparent;
  border-radius: var(--radius);
  transition:
    color 0.14s var(--ease),
    background-color 0.14s var(--ease),
    border-color 0.14s var(--ease);
}

.nav-list a:hover {
  color: var(--ink);
  background: var(--sand-l);
  border-bottom-color: var(--amber);
}

.nav-list a[aria-current="page"] {
  color: var(--ink);
  background: var(--sand-l);
  border-bottom-color: var(--amber);
}

.header-actions {
  flex: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-inline-start: auto;
}

.header-cta { white-space: nowrap; }

.version-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--slate);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.12rem 0.4rem;
  line-height: 1.5;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: background-color 0.14s var(--ease), color 0.14s var(--ease);
}

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

.nav-toggle-label { line-height: 1; }

.nav-toggle-bars {
  display: grid;
  gap: 3px;
  width: 1rem;
}

.nav-toggle-bars > span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.16s var(--ease), opacity 0.16s var(--ease);
}

.site-header[data-open] .nav-toggle-bars > span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}
.site-header[data-open] .nav-toggle-bars > span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle-bars > span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.68rem 1.15rem;
  font-family: var(--font-sans);
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color 0.14s var(--ease),
    color 0.14s var(--ease),
    border-color 0.14s var(--ease),
    transform 0.14s var(--ease);
}

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

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

.btn-ghost {
  border-color: rgba(20, 52, 43, 0.32);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

.btn-sm {
  padding: 0.42rem 0.78rem;
  font-size: 0.76rem;
}

/* ---------- 8. 标签 / 卡片 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.22rem 0.55rem;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ink);
  border: 1px solid rgba(20, 52, 43, 0.24);
  border-radius: var(--radius);
  white-space: nowrap;
}

.tag--amber { border-color: var(--amber); color: var(--amber); }

.tag--solid {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--sand);
}

.card {
  background: var(--sand-l);
  border: var(--hair);
  border-radius: var(--radius);
  padding: clamp(1rem, 2.2vw, 1.6rem);
  box-shadow: 0 1px 0 rgba(20, 52, 43, 0.06);
  transition: transform 0.14s var(--ease), border-color 0.14s var(--ease);
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--amber);
}

.card--ink {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--sand);
}
.card--ink .section-title { color: var(--paper); }
.card--ink:hover { border-color: var(--amber); }

/* ---------- 9. 面包屑与内页容器 ---------- */
.breadcrumb {
  padding-block: 1.1rem;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

.breadcrumb a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid rgba(76, 100, 112, 0.35);
  transition: color 0.14s var(--ease), border-color 0.14s var(--ease);
}

.breadcrumb a:hover {
  color: var(--ink);
  border-bottom-color: var(--amber);
}

/* ---------- 10. 图片容器（页面阶段放置图片） ---------- */
.img-frame {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--sand-l);
  border: var(--hair);
  border-radius: var(--radius);
}

.img-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.02);
}

.img-frame--wide { aspect-ratio: 16 / 9; }
.img-frame--portrait { aspect-ratio: 3 / 4; }
.img-frame--square { aspect-ratio: 1 / 1; }

.img-frame__tag {
  position: absolute;
  top: 0;
  left: 0;
  padding: 0.28rem 0.55rem;
  background: var(--ink);
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
}

.img-caption {
  display: flex;
  gap: 0.6rem;
  margin-top: 0.6rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--slate);
}

.img-caption .mono {
  flex: none;
  color: var(--ink);
}

/* ---------- 11. 入场显现 ---------- */
[data-reveal] {
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
}

[data-reveal].is-pending {
  opacity: 0;
  transform: translateY(12px);
}

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

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(4rem, 9vw, 7rem);
  background: var(--ink);
  color: var(--sand);
}

.site-footer::before {
  content: "";
  display: block;
  height: 6px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(232, 220, 200, 0.42) 0 1px,
    transparent 1px 14px
  );
  border-bottom: 1px solid rgba(232, 220, 200, 0.14);
}

.footer-inner { padding-block: 0; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.8fr 0.9fr 1.2fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2.5rem, 5vw, 3.6rem);
}

.footer-col { min-width: 0; }

.footer-logo {
  display: inline-block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.7rem;
  letter-spacing: 0.14em;
  color: var(--paper);
  text-decoration: none;
  line-height: 1.2;
}

.footer-logo:hover { color: var(--sand); }

.footer-tagline {
  margin-top: 0.9rem;
  max-width: 24ch;
  font-size: 0.88rem;
  line-height: 1.8;
  color: rgba(232, 220, 200, 0.74);
}

.footer-seal {
  display: inline-block;
  margin-top: 1.15rem;
  padding: 0.18rem 0.5rem;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--sand);
  border: 1px solid rgba(232, 220, 200, 0.3);
  border-radius: var(--radius);
}

.footer-heading {
  margin-bottom: 0.95rem;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--line);
}

.footer-links {
  display: grid;
  gap: 0.55rem;
  list-style: none;
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-links a {
  color: var(--sand);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.14s var(--ease), border-color 0.14s var(--ease);
}

.footer-links a:hover {
  color: var(--paper);
  border-bottom-color: var(--amber);
}

.footer-links a:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.footer-value {
  color: var(--paper);
  font-size: 0.82rem;
  word-break: break-all;
}

.footer-addr {
  display: block;
  color: rgba(232, 220, 200, 0.78);
  font-size: 0.84rem;
  max-width: 22ch;
}

.footer-icp {
  display: inline-block;
  color: rgba(232, 220, 200, 0.62);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-block: 1.3rem 2rem;
  border-top: 1px solid rgba(232, 220, 200, 0.16);
  font-size: 0.74rem;
  color: rgba(232, 220, 200, 0.58);
}

.footer-base-issue {
  color: var(--sand);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
}

.footer-base-copy { color: rgba(232, 220, 200, 0.58); }

/* ---------- 13. 响应式：平板与移动 ---------- */
@media (max-width: 1024px) {
  .header-main-inner { flex-wrap: wrap; row-gap: 0.6rem; }

  .brand { margin-inline-end: auto; }

  .header-actions { margin-inline-start: auto; gap: 0.5rem; }

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

  .nav-dock {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.85rem var(--gutter) 1.25rem;
    background: var(--paper);
    border-top: 1px solid rgba(20, 52, 43, 0.12);
    border-bottom: 1px solid rgba(20, 52, 43, 0.18);
    box-shadow: 0 24px 36px -28px rgba(20, 52, 43, 0.55);
    max-height: calc(100vh - 5rem);
    overflow-y: auto;
  }

  .site-header[data-open] .nav-dock { display: flex; }

  .nav-meta {
    margin-bottom: 0.6rem;
    padding-inline-start: 0.2rem;
    white-space: normal;
  }

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

  .nav-list li { border-bottom: 1px solid rgba(20, 52, 43, 0.1); }
  .nav-list li:last-child { border-bottom: 0; }

  .nav-list a {
    padding: 0.8rem 0.6rem 0.8rem 0.9rem;
    font-size: 0.98rem;
    border-bottom: 1px solid transparent;
    border-left: 2px solid transparent;
    border-radius: 0;
  }

  .nav-list a:hover {
    background: var(--sand-l);
    border-bottom-color: transparent;
    border-left-color: rgba(194, 101, 24, 0.55);
  }

  .nav-list a[aria-current="page"] {
    background: var(--sand-l);
    border-bottom-color: transparent;
    border-left-color: var(--amber);
  }

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

  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 820px) {
  .version-tag { display: none; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .ribbon-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.1rem;
    padding-block: 0.35rem;
  }

  .ribbon-note { text-align: left; }

  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: minmax(0, 1fr); }

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

  .footer-tagline { max-width: none; }

  .footer-base { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 520px) {
  .brand-mark { width: 2.1rem; height: 2.1rem; font-size: 1.05rem; }
  .brand-name { font-size: 1.15rem; }
  .brand-sub { display: none; }
  .header-cta { padding: 0.5rem 0.7rem; font-size: 0.76rem; }
  .nav-toggle-label { display: none; }
}

/* ---------- 14. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal],
  [data-reveal].is-pending {
    opacity: 1 !important;
    transform: none !important;
  }

  .card:hover { transform: none; }
}