/* ==========================================================================
   吃瓜网 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base：变量、重置、排版、可访问性
   -------------------------------------------------------------------------- */
:root {
  --ink: #0E1B1A;
  --paper: #F6F3EA;
  --teal: #0F5C55;
  --orange: #C8401F;
  --yellow: #F2C14E;
  --gray: #4A5A57;
  --line: #A9B7B3;
  --paper-soft: #FBF9F3;
  --paper-deep: #EDE8DA;
  --ink-soft: #1B2C2A;

  --font-serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", monospace;

  --w-page: 1120px;
  --w-narrow: 960px;
  --w-read: 900px;
  --w-article: 760px;
  --w-aside: 320px;
  --radius: 3px;
  --radius-lg: 6px;
  --gap: 48px;
  --gap-sm: 32px;
  --header-h: 68px;
  --taskbar-h: 0px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-feature-settings: "kern" 1;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  font-family: var(--font-serif);
  color: var(--ink);
  line-height: 1.32;
  font-weight: 650;
}

h1 { font-weight: 700; }
h2 { font-size: clamp(1.4rem, 2.4vw, 1.85rem); }
h3 { font-size: 1.12rem; }
h4 { font-size: 1rem; }

p {
  margin: 0 0 1em;
}

ul, ol {
  margin: 0 0 1em;
  padding-left: 1.35em;
}

li {
  margin-bottom: 0.4em;
}

li:last-child {
  margin-bottom: 0;
}

a {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 0.15s ease, text-decoration-thickness 0.15s ease;
}

a:hover {
  color: var(--orange);
  text-decoration-thickness: 2px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
  border-radius: 2px;
}

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

figure {
  margin: 0;
}

figcaption {
  margin-top: 0.6em;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--gray);
}

strong {
  font-weight: 650;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

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

summary {
  cursor: pointer;
}

.visually-hidden {
  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: absolute;
  top: -100px;
  left: 12px;
  z-index: 200;
  padding: 10px 18px;
  background-color: var(--ink);
  color: var(--paper);
  font-size: 0.9rem;
  text-decoration: none;
  border-radius: var(--radius);
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 12px;
  color: var(--paper);
}

/* --------------------------------------------------------------------------
   2. layout：页头、导航、主容器、面包屑、页标题、页脚、底部任务栏
   -------------------------------------------------------------------------- */

/* 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  max-width: var(--w-page);
  min-height: var(--header-h);
  margin: 0 auto;
  padding: 10px 24px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  flex-shrink: 0;
}

.brand:hover {
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  font-family: var(--font-serif);
  font-size: 1.32rem;
  font-weight: 700;
  line-height: 1.2;
  padding-bottom: 2px;
  border-bottom: 3px solid var(--orange);
}

.brand-sub {
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--gray);
  letter-spacing: 0.02em;
}

/* 主导航 */
.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav li {
  margin: 0;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 11px;
  font-size: 0.92rem;
  line-height: 1.4;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  border-radius: var(--radius) var(--radius) 0 0;
}

.site-nav a:hover {
  color: var(--teal);
  background-color: var(--paper-deep);
  text-decoration: none;
}

.site-nav a.is-current {
  color: var(--ink);
  font-weight: 650;
  border-bottom-color: var(--orange);
  background-color: var(--paper-deep);
}

.site-nav a.is-current::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 6px;
  background-color: var(--orange);
  border-radius: 1px;
}

/* 移动菜单按钮 */
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 48px;
  height: 48px;
  padding: 0;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.menu-toggle:hover {
  background-color: var(--paper-deep);
}

.menu-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--ink);
  border-radius: 1px;
}

.mobile-menu {
  border-top: 1px solid var(--line);
  background-color: var(--paper-soft);
}

.mobile-menu[hidden] {
  display: none;
}

.mobile-menu nav {
  max-width: var(--w-page);
  margin: 0 auto;
  padding: 12px 24px 20px;
}

.mobile-menu ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.mobile-menu li {
  margin: 0;
}

.mobile-menu a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 8px 12px;
  font-size: 1rem;
  color: var(--ink);
  text-decoration: none;
  border-left: 3px solid transparent;
}

.mobile-menu a:hover {
  background-color: var(--paper-deep);
  text-decoration: none;
}

.mobile-menu a.is-current {
  font-weight: 650;
  border-left-color: var(--orange);
  background-color: var(--paper-deep);
}

/* 主容器 */
.site-main {
  display: block;
  width: 100%;
}

.inner-main {
  width: 100%;
  max-width: var(--w-page);
  margin: 0 auto;
  padding: 0 24px 56px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 22px 0 0;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--gray);
}

.breadcrumb a {
  color: var(--gray);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.breadcrumb-sep {
  color: var(--line);
  font-family: var(--font-mono);
}

.breadcrumb-current {
  color: var(--ink);
  font-weight: 600;
}

/* 页标题区 */
.page-header {
  margin: 18px 0 0;
  padding: 26px 0 22px;
  border-bottom: 2px solid var(--ink);
}

.page-title {
  margin: 0;
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.26;
  color: var(--ink);
}

/* 页脚 */
.site-footer {
  margin-top: 8px;
  padding: 48px 0 0;
  background-color: var(--ink);
  color: var(--paper);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 36px 32px;
  width: 100%;
  max-width: var(--w-page);
  margin: 0 auto;
  padding: 0 24px 36px;
}

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

.footer-brand-name {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 1.24rem;
  font-weight: 700;
  color: var(--paper);
}

.footer-brand-desc {
  margin: 0 0 14px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: #C6D0CC;
}

.footer-col-title {
  margin: 0 0 12px;
  font-family: var(--font-sans);
  font-size: 0.86rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  color: var(--yellow);
}

.footer-col ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-col li {
  margin: 0 0 4px;
}

.footer-col a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 0.92rem;
  color: #DDE5E2;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.footer-col a:hover {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
  text-decoration: none;
}

.footer-brand .text-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  color: var(--yellow);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-brand .text-link:hover {
  color: #FFE29A;
}

.footer-bottom {
  border-top: 1px solid #2C3B39;
}

.footer-bottom p {
  max-width: var(--w-page);
  margin: 0 auto;
  padding: 18px 24px 24px;
  font-size: 0.82rem;
  line-height: 1.7;
  color: #A9B7B3;
}

/* 底部任务栏（移动端） */
.mobile-task-nav,
.task-nav,
.task-bar {
  display: none;
}

/* --------------------------------------------------------------------------
   3. components：通用按钮、文字链接、标签、卡片字段、折叠问答、表格
   -------------------------------------------------------------------------- */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 22px;
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius);
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn .arrow {
  font-size: 0.9em;
  line-height: 1;
}

.btn-primary {
  background-color: var(--orange);
  border-color: var(--orange);
  color: #FFF8F2;
}

.btn-primary:hover {
  background-color: #A7320F;
  border-color: #A7320F;
  color: #FFF8F2;
  text-decoration: none;
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--teal);
  color: var(--teal);
}

.btn-secondary:hover {
  background-color: var(--teal);
  border-color: var(--teal);
  color: var(--paper);
  text-decoration: none;
}

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

.btn-ghost:hover {
  background-color: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
  text-decoration: none;
}

/* 文字链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.text-link .arrow {
  font-size: 0.9em;
  line-height: 1;
  transition: transform 0.15s ease;
}

.text-link:hover {
  color: var(--orange);
  text-decoration-thickness: 2px;
}

.text-link:hover .arrow {
  transform: translateX(3px);
}

/* 字段键名 */
.field-key {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 7px;
  font-size: 0.78rem;
  font-weight: 650;
  line-height: 1.6;
  color: var(--teal);
  background-color: var(--paper-deep);
  border-radius: 2px;
  white-space: nowrap;
}

/* 栏目标签 */
.section-tag,
.section-label {
  display: inline-block;
  margin: 0 0 10px;
  padding: 3px 10px;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  line-height: 1.5;
  color: var(--paper);
  background-color: var(--teal);
  border-radius: 2px;
}

/* 折叠问答（首页与常见问题页共用） */
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-soft);
}

.faq-item + .faq-item {
  margin-top: 10px;
}

.faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 48px;
  padding: 14px 18px;
  font-family: var(--font-serif);
  font-size: 1.02rem;
  font-weight: 650;
  line-height: 1.55;
  color: var(--ink);
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::before {
  content: "+";
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  background-color: var(--teal);
  border-radius: 2px;
}

.faq-item[open] summary::before {
  content: "−";
  background-color: var(--orange);
}

.faq-item summary:hover {
  color: var(--teal);
}

.faq-answer {
  padding: 0 18px 16px 52px;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.faq-answer p {
  margin: 0 0 0.7em;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* 数据表格 */
.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-soft);
}

.data-table {
  min-width: 640px;
  font-size: 0.92rem;
  line-height: 1.65;
}

.data-table caption {
  text-align: left;
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.data-table thead th {
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  color: var(--paper);
  background-color: var(--teal);
  border-bottom-color: var(--teal);
}

.data-table tbody th {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  font-weight: 650;
  color: var(--ink);
  background-color: var(--paper-deep);
  white-space: nowrap;
}

.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table tbody tr:hover td {
  background-color: #F1EDE1;
}

/* 延伸阅读带 */
.read-more,
.further-reading {
  margin-top: var(--gap);
  padding: 24px 0 0;
  border-top: 1px solid var(--line);
}

.read-more h2,
.further-reading h2 {
  font-size: 1.1rem;
  margin-bottom: 14px;
}

.read-more-links,
.read-more-list,
.reading-list,
.related-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.read-more-links li,
.read-more-list li,
.reading-list li,
.related-list li {
  margin: 0;
}

.read-more-links a,
.read-more-list a,
.reading-list a,
.related-list a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 侧栏（服务矩阵 / 方法说明） */
.aside-title {
  margin: 0 0 12px;
  font-size: 1rem;
  font-weight: 650;
}

.aside-card {
  padding: 14px 16px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius);
}

.aside-card + .aside-card {
  margin-top: 10px;
}

.aside-card h3 {
  margin: 0 0 6px;
  font-size: 0.96rem;
}

.aside-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--gray);
}

/* --------------------------------------------------------------------------
   4. pages：首页
   -------------------------------------------------------------------------- */
.home-main {
  width: 100%;
}

/* 首屏 */
.hero {
  border-bottom: 1px solid var(--line);
  background-color: var(--paper-soft);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  grid-template-areas: "main index";
  gap: var(--gap);
  width: 100%;
  max-width: var(--w-page);
  margin: 0 auto;
  padding: 48px 24px 52px;
}

.hero-main {
  grid-area: main;
  min-width: 0;
}

.hero-eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 3px 10px;
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  line-height: 1.5;
  color: var(--ink);
  background-color: var(--yellow);
  border-radius: 2px;
}

.hero-main h1 {
  margin: 0 0 16px;
  font-size: clamp(2.1rem, 4vw, 3.4rem);
  font-weight: 700;
  line-height: 1.22;
  color: var(--ink);
}

.hero-lead {
  max-width: 46em;
  margin: 0 0 22px;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.hero-figure {
  margin: 0 0 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--paper-deep);
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.hero-figure figcaption {
  margin: 0;
  padding: 10px 14px;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--gray);
  background-color: var(--paper);
  border-top: 1px solid var(--line);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 26px;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background-color: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0;
  padding: 12px 14px;
  background-color: var(--paper);
}

.fact-key {
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  line-height: 1.5;
  color: var(--teal);
}

.fact-val {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* 首屏窄侧索引 */
.hero-index {
  grid-area: index;
  align-self: start;
  padding: 20px;
  background-color: var(--paper);
  border: 1px solid var(--line);
  border-top: 4px solid var(--orange);
  border-radius: var(--radius);
}

.index-title {
  margin: 0 0 14px;
  font-size: 0.94rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.index-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: idx;
}

.index-list li {
  margin: 0;
  border-top: 1px solid var(--line);
}

.index-list li:first-child {
  border-top: 0;
}

.index-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 8px 2px;
  font-size: 0.94rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
  text-decoration: none;
}

.index-list a::before {
  counter-increment: idx;
  content: counter(idx, decimal-leading-zero);
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--orange);
}

.index-list a::after {
  content: "→";
  margin-left: auto;
  font-size: 0.9em;
  color: var(--teal);
  transition: transform 0.15s ease;
}

.index-list a:hover {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.index-list a:hover::after {
  transform: translateX(3px);
}

/* 首页通用区块骨架 */
.home-main section {
  width: 100%;
  max-width: var(--w-page);
  margin: 0 auto;
  padding: var(--gap) 24px 0;
}

.section-head {
  max-width: 780px;
  margin-bottom: 26px;
}

.section-head h2 {
  margin: 0 0 10px;
}

.section-intro {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--gray);
}

/* 服务矩阵 */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.service-item {
  display: flex;
  flex-direction: column;
  padding: 20px 22px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-top: 3px solid var(--teal);
  border-radius: var(--radius);
}

.service-item h3 {
  margin: 0 0 10px;
  font-size: 1.14rem;
}

.service-scene,
.service-output {
  margin: 0 0 10px;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

.service-output {
  margin-bottom: 16px;
}

.service-item .text-link {
  margin-top: auto;
  align-self: flex-start;
}

.services-figure {
  margin-top: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--paper-deep);
}

.services-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.services-figure figcaption {
  margin: 0;
  padding: 10px 14px;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--gray);
  background-color: var(--paper);
  border-top: 1px solid var(--line);
}

/* 协作流程时间线（首页） */
.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background-color: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.timeline-item {
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 18px 16px;
  background-color: var(--paper-soft);
}

.timeline-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  background-color: var(--teal);
  border-radius: 2px;
}

.timeline-item h3 {
  margin: 0 0 8px;
  font-size: 1.04rem;
}

.timeline-action {
  margin: 0 0 10px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.timeline-output {
  margin: auto 0 0;
  padding-top: 10px;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--gray);
  border-top: 1px dashed var(--line);
}

.timeline-more,
.method-more,
.faq-more {
  margin: 20px 0 0;
}

/* 通用业务场景瀑布 */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.scenarios-col {
  display: grid;
  align-content: start;
  gap: 18px;
}

.scenario-item {
  padding: 20px 22px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-left: 4px solid var(--yellow);
  border-radius: var(--radius);
}

.scenario-item h3 {
  margin: 0 0 8px;
  font-size: 1.06rem;
}

.scenario-item > p {
  margin: 0 0 10px;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

.scenario-task {
  margin: 0 0 14px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--gray);
}

/* 合作问题排查入口 */
.troubleshoot-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.troubleshoot-list li {
  margin: 0;
}

.troubleshoot-list a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 14px;
  align-items: center;
  min-height: 48px;
  padding: 14px 18px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  text-decoration: none;
}

.troubleshoot-list a:hover {
  border-color: var(--orange);
  background-color: var(--paper);
  text-decoration: none;
}

.troubleshoot-name {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 650;
  line-height: 1.5;
  color: var(--ink);
}

.troubleshoot-desc {
  grid-column: 1 / 2;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--gray);
}

.troubleshoot-list .arrow {
  grid-column: 2 / 3;
  grid-row: 1 / span 2;
  font-size: 1.1rem;
  color: var(--orange);
  transition: transform 0.15s ease;
}

.troubleshoot-list a:hover .arrow {
  transform: translateX(3px);
}

/* 方法摘要 */
.method-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.method-item {
  padding: 20px 22px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-top: 3px solid var(--ink);
  border-radius: var(--radius);
}

.method-item h3 {
  margin: 0 0 10px;
  font-size: 1.04rem;
}

.method-question,
.method-record {
  margin: 0 0 10px;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

.method-record {
  margin-bottom: 0;
  color: var(--gray);
}

/* 首页常见问题 */
.faq-list {
  max-width: 860px;
}

/* 首页相关内容带 */
.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  width: 100%;
  max-width: var(--w-page);
  margin: 0 auto;
  padding: 28px 24px 0;
}

.related-links-label {
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  color: var(--gray);
}

.related-links-item {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.related-links-item:hover {
  color: var(--orange);
}

/* --------------------------------------------------------------------------
   4. pages：内页通用（页标题区、右侧栏、区块）
   -------------------------------------------------------------------------- */

/* 页标题区下方的导语条 */
.page-hero,
.page-head {
  margin: 0 0 var(--gap);
  padding: 24px 0 0;
}

.page-hero-lead,
.page-lead {
  max-width: 68em;
  margin: 0 0 14px;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-hero-points,
.page-points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-hero-points li,
.page-points li {
  position: relative;
  margin: 0;
  padding: 10px 14px 10px 30px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ink-soft);
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-hero-points li::before,
.page-points li::before {
  content: "";
  position: absolute;
  top: 17px;
  left: 14px;
  width: 7px;
  height: 7px;
  background-color: var(--orange);
  border-radius: 1px;
}

/* 右侧栏布局：主内容在前，aside 在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--w-aside);
  gap: var(--gap);
  align-items: start;
}

.layout-shell {
  margin-top: 0;
}

.page-main,
.content-main {
  min-width: 0;
}

.page-aside,
.content-aside {
  min-width: 0;
}

@media (min-width: 961px) {
  .page-aside,
  .content-aside {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }
}

/* 内页 section 通用 */
.section {
  margin-bottom: var(--gap);
}

.section:last-child {
  margin-bottom: 0;
}

.section-lead,
.section-desc {
  margin: 0 0 18px;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--gray);
}

/* --------------------------------------------------------------------------
   4. pages：服务矩阵
   -------------------------------------------------------------------------- */
.service-entry {
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
}

.service-entry:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.service-entry h2 {
  margin-bottom: 12px;
}

.media-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 260px);
  gap: 22px;
  align-items: start;
  margin: 22px 0;
  padding: 18px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.media-block figure {
  margin: 0;
}

.media-block img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

/* 服务适配判断 */
.fit-grid {
  display: grid;
  gap: 12px;
  margin: 0 0 18px;
}

.fit-item {
  padding: 16px 18px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
}

.fit-item h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.fit-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

.fit-next {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 服务页侧栏 */
.aside-block + .aside-block {
  margin-top: 26px;
}

.aside-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.aside-links li {
  margin: 0 0 4px;
}

.aside-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 0.92rem;
}

/* 服务页侧栏字段卡 */
.fact-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.fact-list li {
  margin: 0 0 8px;
  padding: 10px 12px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ink-soft);
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* --------------------------------------------------------------------------
   4. pages：合作流程
   -------------------------------------------------------------------------- */
.process-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
  gap: var(--gap-sm);
  align-items: start;
  margin: 0 0 var(--gap);
  padding: 22px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.process-intro-text h2 {
  margin: 0 0 10px;
}

.process-intro-text p {
  margin: 0 0 10px;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.process-intro-text p:last-child {
  margin-bottom: 0;
}

.process-intro-media {
  margin: 0;
}

.process-intro-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

/* 四阶段时间线（内页） */
.timeline-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--line);
}

.timeline-list .timeline-item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 18px;
  margin: 0 0 22px;
  padding: 0;
  background-color: transparent;
  border: 0;
  border-radius: 0;
}

.timeline-list .timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-list .timeline-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin: 0 0 0 -25px;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  background-color: var(--teal);
  border: 3px solid var(--paper);
  border-radius: 50%;
}

.timeline-body {
  min-width: 0;
  padding: 16px 20px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.timeline-body h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.timeline-desc {
  margin: 0 0 12px;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.timeline-fields {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 6px 14px;
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

.timeline-fields dt {
  font-size: 0.84rem;
  font-weight: 650;
  line-height: 1.7;
  color: var(--teal);
}

.timeline-fields dd {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--gray);
}

/* 资料清单 */
.checklist-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist-item {
  margin: 0;
  padding: 18px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-top: 3px solid var(--yellow);
  border-radius: var(--radius);
}

.checklist-item h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.checklist-use,
.checklist-when {
  margin: 0 0 8px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.checklist-when {
  margin-bottom: 0;
  color: var(--gray);
}

/* 角色职责说明 */
.roles-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.roles-col {
  min-width: 0;
  padding: 20px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.roles-col h3 {
  margin: 0 0 10px;
  font-size: 1.04rem;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--teal);
}

.roles-col ul {
  margin: 0;
  padding-left: 1.2em;
}

.roles-col li {
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* 流程页区块间距 */
.process-timeline,
.process-checklist,
.process-roles {
  margin-bottom: var(--gap);
}

/* --------------------------------------------------------------------------
   4. pages：方法说明
   -------------------------------------------------------------------------- */
.page-head .section-tag {
  margin-bottom: 12px;
}

.method-intro {
  margin-bottom: var(--gap);
}

.method-intro h2 {
  margin-bottom: 10px;
}

.method-intro p {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.media-figure {
  margin: 20px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--paper-deep);
}

.media-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.media-figure figcaption {
  margin: 0;
  padding: 10px 14px;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--gray);
  background-color: var(--paper);
  border-top: 1px solid var(--line);
}

.method-block {
  margin-bottom: var(--gap);
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.method-block > h2 {
  margin-bottom: 10px;
}

.method-block > p {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* 四维定义列表 */
.dim-list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
}

.dim-item {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 14px 16px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius);
}

.dim-item dt {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  font-weight: 650;
  line-height: 1.6;
  color: var(--ink);
}

.dim-item dd {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* 内容策略判断 */
.strategy-list {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.strategy-item {
  margin: 0;
  padding: 16px 18px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.strategy-item h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.strategy-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* 信息核验编号清单 */
.verify-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: verify;
}

.verify-list li {
  position: relative;
  margin: 0 0 10px;
  padding: 14px 16px 14px 52px;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--ink-soft);
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  counter-increment: verify;
}

.verify-list li::before {
  content: counter(verify);
  position: absolute;
  top: 14px;
  left: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  background-color: var(--teal);
  border-radius: 2px;
}

/* 复盘记录字段 */
.review-list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.review-list li {
  margin: 0;
  padding: 14px 16px;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--ink-soft);
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
}

/* 方法页侧栏 */
.content-aside .aside-title {
  padding-bottom: 8px;
  border-bottom: 2px solid var(--teal);
}

.aside-link {
  margin-top: 16px;
}

/* --------------------------------------------------------------------------
   4. pages：合作问题排查
   -------------------------------------------------------------------------- */
.page-shell {
  width: 100%;
  max-width: var(--w-narrow);
  margin: 0 auto;
  padding: 0 24px;
}

/* 标题区（排查页 / 常见问题页复用 page-hero / page-title 结构） */
.page-troubleshooting .page-title,
.page-faq .page-title {
  /* 保持与全站页标题一致，不改写全局 */
}

.page-troubleshooting .page-title {
  /* 占位无样式，避免空规则 */
}

.trouble-intro {
  margin: 0 0 var(--gap);
  padding: 0;
}

.trouble-intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
  gap: var(--gap-sm);
  align-items: start;
  padding: 22px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.trouble-intro-text h2 {
  margin: 10px 0 10px;
  font-size: 1.3rem;
}

.trouble-intro-text p {
  margin: 0 0 10px;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.trouble-intro-text p:last-child {
  margin-bottom: 0;
}

.trouble-intro-media {
  margin: 0;
}

.trouble-intro-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

/* 现象条目 */
.trouble-list {
  display: grid;
  gap: 22px;
}

.trouble-item {
  padding: 0;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.trouble-item-head {
  padding: 18px 22px;
  background-color: var(--paper-deep);
  border-bottom: 1px solid var(--line);
}

.trouble-index {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.trouble-item-head h2 {
  margin: 0 0 6px;
  font-size: 1.24rem;
}

.trouble-summary {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--gray);
}

.trouble-body {
  padding: 20px 22px;
}

.trouble-block {
  margin-bottom: 18px;
}

.trouble-block h3 {
  margin: 0 0 8px;
  font-size: 0.98rem;
  padding-left: 10px;
  border-left: 3px solid var(--teal);
}

.trouble-block .trouble-list {
  margin: 0;
  padding-left: 1.25em;
  list-style: disc;
  display: block;
}

.trouble-block .trouble-list li {
  margin: 0 0 6px;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

.trouble-escalate {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  padding: 14px 16px;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--ink-soft);
  background-color: #FBF4E2;
  border: 1px solid var(--yellow);
  border-radius: var(--radius);
}

.trouble-tag {
  flex-shrink: 0;
  padding: 1px 8px;
  font-size: 0.78rem;
  font-weight: 650;
  line-height: 1.6;
  color: var(--ink);
  background-color: var(--yellow);
  border-radius: 2px;
}

/* 何时转入协作沟通 */
.trouble-handoff {
  margin-top: var(--gap);
  padding: 30px 0;
  background-color: var(--paper-deep);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.trouble-handoff h2 {
  margin-bottom: 10px;
}

.trouble-handoff p {
  max-width: 62em;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.handoff-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

/* 延伸阅读 */
.further-reading {
  padding: 26px 0 0;
}

.further-reading .page-shell {
  padding: 0;
}

/* --------------------------------------------------------------------------
   4. pages：常见问题
   -------------------------------------------------------------------------- */
.faq-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  gap: var(--gap-sm);
  align-items: start;
  margin: 0 0 var(--gap);
  padding: 22px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.faq-intro-text h2 {
  margin: 0 0 10px;
}

.faq-intro-text p {
  margin: 0 0 10px;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.faq-intro-text p:last-child {
  margin-bottom: 0;
}

.faq-intro-media {
  margin: 0;
}

.faq-intro-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

.faq-group {
  margin-bottom: var(--gap-sm);
}

.faq-group h2 {
  margin-bottom: 8px;
}

.faq-group-desc {
  margin: 0 0 16px;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--gray);
}

/* 如何继续了解 */
.faq-next {
  margin-top: var(--gap);
  padding-top: 26px;
  border-top: 2px solid var(--ink);
}

.faq-next h2 {
  margin-bottom: 8px;
}

.faq-next > p {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.next-paths {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.path-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 48px;
  padding: 18px 20px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  border-radius: var(--radius);
  color: var(--ink);
  text-decoration: none;
}

.path-card:hover {
  background-color: var(--paper);
  border-color: var(--teal);
  border-top-color: var(--orange);
  text-decoration: none;
}

.path-label {
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.path-title {
  font-family: var(--font-serif);
  font-size: 1.06rem;
  font-weight: 650;
  color: var(--ink);
}

.path-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--gray);
}

/* --------------------------------------------------------------------------
   4. pages：关于吃瓜网
   -------------------------------------------------------------------------- */
.page-container {
  width: 100%;
  max-width: var(--w-read);
  margin: 0 auto;
  padding: 0 24px;
}

.page-container-narrow {
  max-width: var(--w-read);
}

.page-hero-about {
  padding-top: 24px;
}

/* 品牌定位 */
.about-positioning {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  gap: var(--gap-sm);
  align-items: start;
  margin-bottom: var(--gap);
  padding: 22px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.about-positioning-text h2 {
  margin: 0 0 10px;
}

.about-positioning-text p {
  margin: 0 0 10px;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.about-positioning-figure {
  margin: 0;
}

.about-positioning-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

/* 服务对象 */
.about-audience,
.about-principles,
.about-boundary,
.about-nav-guide,
.related-reading {
  margin-bottom: var(--gap);
}

.about-audience > p,
.about-principles > p,
.about-boundary > p,
.about-nav-guide > p {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.about-numbered-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: audience;
}

.about-numbered-item {
  position: relative;
  margin: 0 0 12px;
  padding: 16px 18px 16px 58px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  counter-increment: audience;
}

.about-numbered-item::before {
  content: counter(audience, decimal-leading-zero);
  position: absolute;
  top: 16px;
  left: 16px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.7;
  color: var(--orange);
}

.about-numbered-item h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.about-numbered-item p {
  margin: 0 0 6px;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

.about-numbered-item p:last-child {
  margin-bottom: 0;
  color: var(--gray);
}

/* 工作原则 */
.about-principle-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.about-principle-item {
  padding: 18px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-top: 3px solid var(--teal);
  border-radius: var(--radius);
}

.about-principle-index {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.about-principle-item h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.about-principle-item p:last-child {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

.about-principles-more {
  margin: 16px 0 0;
}

/* 服务边界 */
.about-boundary-list {
  margin: 18px 0;
  padding: 0;
  list-style: none;
}

.about-boundary-list li {
  position: relative;
  margin: 0 0 8px;
  padding: 12px 16px 12px 40px;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--ink-soft);
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.about-boundary-list li::before {
  content: "×";
  position: absolute;
  top: 12px;
  left: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  background-color: var(--orange);
  border-radius: 2px;
}

/* 站内导航说明 */
.about-nav-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.about-nav-col {
  min-width: 0;
  padding: 18px;
  background-color: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.about-nav-col h3 {
  margin: 0 0 8px;
  padding-bottom: 8px;
  font-size: 0.98rem;
  border-bottom: 2px solid var(--yellow);
}

.about-nav-col ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-nav-col li {
  margin: 0;
}

.about-nav-col a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 0.92rem;
}

/* 相关阅读 */
.related-reading {
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.related-reading h2 {
  margin-bottom: 14px;
  font-size: 1.1rem;
}

/* --------------------------------------------------------------------------
   4. pages：404
   -------------------------------------------------------------------------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 62vh;
  padding: 48px 24px;
}

.error-inner {
  width: 100%;
  max-width: 640px;
  text-align: left;
}

.error-code {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.error-title {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.26;
}

.error-lead {
  margin: 0 0 22px;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.error-guide {
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.error-guide-title {
  margin: 0 0 10px;
  font-size: 1rem;
}

.error-guide-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.error-guide-list li {
  margin: 0;
}

.error-guide-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 0;
  font-size: 0.94rem;
}

/* --------------------------------------------------------------------------
   5. responsive：960px 与 680px 两个断点
   -------------------------------------------------------------------------- */
@media (max-width: 1120px) {
  .site-nav a {
    padding: 6px 8px;
    font-size: 0.88rem;
  }

  .brand-sub {
    display: none;
  }
}

@media (max-width: 960px) {
  :root {
    --gap: 40px;
    --gap-sm: 26px;
  }

  .header-inner {
    padding: 10px 20px;
  }

  .site-nav {
    display: none;
  }

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

  .inner-main {
    padding: 0 20px 48px;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "main"
      "index";
    gap: 26px;
    padding: 34px 20px 40px;
  }

  .hero-index {
    width: 100%;
  }

  .home-main section {
    padding: var(--gap) 20px 0;
  }

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

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

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

  .method-list .method-item:last-child {
    grid-column: 1 / -1;
  }

  .related-links {
    padding: 26px 20px 0;
  }

  /* 内页右侧栏改为单列 */
  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--gap-sm);
  }

  .page-aside,
  .content-aside {
    position: static;
    top: auto;
    padding-top: 22px;
    border-top: 1px solid var(--line);
  }

  .page-shell {
    padding: 0 20px;
  }

  .page-container {
    padding: 0 20px;
  }

  .process-intro,
  .trouble-intro-grid,
  .faq-intro,
  .about-positioning {
    grid-template-columns: minmax(0, 1fr);
  }

  .process-intro-media img,
  .trouble-intro-media img,
  .faq-intro-media img,
  .about-positioning-figure img {
    aspect-ratio: 16 / 9;
  }

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

  .checklist-list .checklist-item:last-child {
    grid-column: 1 / -1;
  }

  .media-block {
    grid-template-columns: minmax(0, 1fr) minmax(0, 220px);
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 24px;
    padding: 0 20px 30px;
  }

  .footer-bottom p {
    padding: 16px 20px 22px;
  }

  /* 底部任务栏 */
  .mobile-task-nav,
  .task-nav,
  .task-bar {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 90;
    display: block;
    background-color: var(--paper);
    border-top: 1px solid var(--line);
    box-shadow: 0 -2px 8px rgba(14, 27, 26, 0.08);
  }

  .mobile-task-nav ul,
  .task-nav ul {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .mobile-task-nav li,
  .task-nav li {
    margin: 0;
    min-width: 0;
  }

  .mobile-task-nav a,
  .task-nav a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    padding: 4px 2px;
    font-size: 0.82rem;
    line-height: 1.3;
    text-align: center;
    color: var(--ink-soft);
    text-decoration: none;
  }

  .mobile-task-nav a.is-current,
  .task-nav a.is-current {
    color: var(--orange);
    font-weight: 650;
    box-shadow: inset 0 2px 0 var(--orange);
  }

  body {
    padding-bottom: 52px;
  }

  .site-footer {
    padding-bottom: 0;
  }
}

@media (max-width: 680px) {
  :root {
    --gap: 32px;
    --gap-sm: 22px;
  }

  body {
    font-size: 15.5px;
  }

  .header-inner {
    min-height: 60px;
    padding: 8px 16px;
  }

  .brand-mark {
    font-size: 1.18rem;
  }

  .mobile-menu nav {
    padding: 10px 16px 18px;
  }

  .inner-main {
    padding: 0 16px 40px;
  }

  .breadcrumb {
    padding-top: 16px;
    font-size: 0.82rem;
  }

  .page-header {
    margin-top: 14px;
    padding: 20px 0 16px;
  }

  .page-hero,
  .page-head {
    padding-top: 18px;
    margin-bottom: var(--gap);
  }

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

  .hero-inner {
    padding: 26px 16px 32px;
  }

  .hero-main h1 {
    font-size: clamp(1.85rem, 8vw, 2.4rem);
  }

  .hero-lead {
    font-size: 0.98rem;
  }

  .hero-actions {
    gap: 10px;
  }

  .hero-actions .btn {
    flex: 1 1 100%;
    justify-content: center;
  }

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

  .home-main section {
    padding: var(--gap) 16px 0;
  }

  .services-grid,
  .scenarios-grid,
  .troubleshoot-list,
  .method-list,
  .timeline,
  .checklist-list,
  .roles-columns,
  .about-principle-grid,
  .about-nav-columns,
  .next-paths {
    grid-template-columns: minmax(0, 1fr);
  }

  .method-list .method-item:last-child,
  .checklist-list .checklist-item:last-child {
    grid-column: auto;
  }

  .timeline {
    gap: 1px;
  }

  .timeline-list .timeline-item {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 12px;
  }

  .timeline-list .timeline-num {
    width: 40px;
    height: 40px;
    margin-left: -21px;
    font-size: 0.9rem;
  }

  .timeline-body {
    padding: 14px 16px;
  }

  .timeline-fields {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .timeline-fields dd {
    margin-bottom: 6px;
  }

  .timeline-fields dd:last-child {
    margin-bottom: 0;
  }

  .dim-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .media-block {
    grid-template-columns: minmax(0, 1fr);
    padding: 14px;
  }

  .media-block img {
    aspect-ratio: 16 / 9;
  }

  .service-item,
  .scenario-item,
  .method-item,
  .checklist-item,
  .roles-col,
  .trouble-body,
  .trouble-item-head {
    padding: 16px;
  }

  .trouble-block .trouble-list {
    padding-left: 1.1em;
  }

  .about-numbered-item {
    padding: 14px 16px 14px 48px;
  }

  .about-numbered-item::before {
    top: 14px;
    left: 14px;
  }

  .about-boundary-list li {
    padding: 12px 14px 12px 36px;
  }

  .related-links {
    padding: 22px 16px 0;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 0 16px 26px;
  }

  .footer-brand {
    order: -1;
  }

  .footer-bottom p {
    padding: 14px 16px 20px;
    font-size: 0.8rem;
  }

  .error-main {
    padding: 36px 16px;
  }

  .error-actions {
    gap: 12px;
  }

  .error-actions .btn {
    flex: 1 1 100%;
    justify-content: center;
  }

  .handoff-actions .btn {
    flex: 1 1 100%;
    justify-content: center;
  }

  .faq-item summary {
    padding: 12px 14px;
    font-size: 0.98rem;
  }

  .faq-answer {
    padding: 0 14px 14px 44px;
  }

  .data-table {
    min-width: 560px;
    font-size: 0.88rem;
  }

  .data-table th,
  .data-table td {
    padding: 10px 12px;
  }
}

@media (max-width: 400px) {
  .hero-main h1 {
    font-size: 1.75rem;
  }

  .page-title {
    font-size: 1.6rem;
  }

  .mobile-task-nav a,
  .task-nav a {
    font-size: 0.76rem;
    min-height: 50px;
  }
}

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}