/* ==========================================================================
   天美网站 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base
   -------------------------------------------------------------------------- */

:root {
  --paper: #F6F2EB;
  --linen: #E8DED0;
  --ink: #26221E;
  --ink-soft: #4A423A;
  --copper: #9A5A35;
  --moss: #44544A;
  --line: #D3C7B7;
  --white: #FFFFFF;
  --maxw: 1120px;
  --radius: 6px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", "Roboto Mono", Menlo, Consolas, "Courier New", monospace;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.3;
}

p {
  margin: 0;
}

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

a {
  color: var(--copper);
  text-decoration: none;
}

a:hover {
  color: var(--moss);
}

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

figure {
  margin: 0;
}

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

button {
  font-family: inherit;
}

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

/* --------------------------------------------------------------------------
   layout · 全局骨架
   -------------------------------------------------------------------------- */

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  flex: 0 0 auto;
}

.brand:hover {
  color: var(--ink);
}

.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 4px;
  background: var(--copper);
  position: relative;
  flex: 0 0 auto;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 2px solid var(--paper);
  border-radius: 2px;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0;
}

.header-tagline {
  margin: 0;
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.4;
  flex: 1 1 auto;
  min-width: 0;
  max-width: 260px;
}

/* 顶部导航（桌面端） */
.site-nav {
  margin-left: auto;
  flex: 0 0 auto;
}

.header-nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.header-nav-item a {
  display: inline-block;
  padding: 8px 10px;
  font-size: 0.88rem;
  color: var(--ink-soft);
  border-radius: 4px;
  line-height: 1.4;
}

.header-nav-item a:hover {
  color: var(--copper);
  background: var(--linen);
}

.header-nav-item.is-current a,
.header-nav-item a.is-current {
  color: var(--copper);
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--copper);
}

/* 移动菜单按钮 */
.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--white);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-left: auto;
  flex: 0 0 auto;
}

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

/* 主布局 */
.page-layout {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 24px 56px;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  flex: 1 0 auto;
}

.page-layout.sidebar-left {
  grid-template-columns: 220px minmax(0, 1fr);
}

.sidebar-left .site-directory {
  order: 1;
}

.sidebar-left .site-main {
  order: 2;
}

.site-directory {
  position: sticky;
  top: 88px;
  align-self: start;
  font-size: 0.86rem;
  border-right: 1px solid var(--line);
  padding-right: 16px;
}

.directory-title,
.directory-heading,
.directory-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--moss);
  text-transform: uppercase;
}

.directory-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.directory-item a {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
  padding: 7px 6px;
  border-radius: 4px;
  color: var(--ink-soft);
  line-height: 1.4;
}

.directory-item a:hover {
  background: var(--linen);
  color: var(--copper);
}

.directory-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--copper);
  font-weight: 500;
}

.directory-name,
.directory-label {
  font-weight: 600;
  color: var(--ink);
}

.directory-desc,
.directory-q,
.directory-note {
  grid-column: 2 / 3;
  display: block;
  font-size: 0.74rem;
  color: var(--ink-soft);
  line-height: 1.5;
  margin-top: 2px;
}

.directory-item.is-current a,
.directory-item a.is-current {
  background: var(--linen);
  color: var(--copper);
}

.directory-item.is-current .directory-name,
.directory-item.is-current .directory-label {
  color: var(--copper);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-main {
  min-width: 0;
  width: 100%;
}

.inner-main {
  max-width: 100%;
  min-width: 0;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

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

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

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

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

/* 页面标题区 */
.page-header {
  margin-bottom: 22px;
}

.page-title {
  font-size: clamp(2rem, 3.6vw, 3.4rem);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.2;
  margin: 0;
}

.page-title-block,
.page-hero,
.page-head {
  margin-bottom: 34px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.page-index,
.page-kicker,
.section-index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--copper);
  letter-spacing: 0.04em;
  margin: 0 0 10px;
}

.page-num {
  color: var(--copper);
  font-weight: 600;
}

.page-description {
  font-size: 0.86rem;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.page-lead {
  margin: 0;
  font-size: 1rem;
  color: var(--ink-soft);
  max-width: 62ch;
  line-height: 1.75;
}

.rule-line {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 20px 0 0;
}

/* 页脚 */
.site-footer {
  background: var(--linen);
  border-top: 1px solid var(--line);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 24px 28px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1.4fr);
  gap: 24px 40px;
}

.footer-brand {
  grid-column: 1 / 2;
}

.footer-name {
  margin: 0 0 8px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
}

.footer-desc {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-soft);
  line-height: 1.7;
  max-width: 40ch;
}

.footer-nav {
  grid-column: 2 / 3;
  justify-self: end;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  justify-content: flex-end;
}

.footer-nav a {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.footer-nav a:hover {
  color: var(--copper);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-note {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.footer-copy {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 0.78rem;
  color: var(--ink-soft);
  font-family: var(--font-mono);
}

/* --------------------------------------------------------------------------
   components · 共用部件
   -------------------------------------------------------------------------- */

/* 链接箭头 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--copper);
}

.link-arrow::after {
  content: "→";
  transition: transform 0.15s ease;
}

.link-arrow:hover {
  color: var(--moss);
}

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

/* 按钮 */
.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.3;
  transition: background 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--copper);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--moss);
  color: var(--white);
}

.btn-ghost {
  border: 1px solid var(--copper);
  color: var(--copper);
  background: transparent;
}

.btn-ghost:hover {
  background: var(--copper);
  color: var(--white);
}

/* 表格通用 */
.table-scroll {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.table-caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 0.8rem;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.matrix-table,
.data-table,
.roles-table {
  min-width: 560px;
  font-size: 0.88rem;
  text-align: left;
}

.matrix-table thead th,
.data-table thead th,
.roles-table thead th {
  background: var(--moss);
  color: var(--white);
  font-weight: 600;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.matrix-table tbody td,
.data-table tbody td,
.roles-table tbody td {
  padding: 12px 14px;
  border-top: 1px solid var(--line);
  vertical-align: top;
  line-height: 1.65;
  color: var(--ink-soft);
}

.matrix-table tbody tr:nth-child(even),
.data-table tbody tr:nth-child(even),
.roles-table tbody tr:nth-child(even) {
  background: var(--paper);
}

.matrix-table tbody td:first-child,
.data-table tbody td:first-child,
.roles-table tbody td:first-child {
  color: var(--ink);
  font-weight: 600;
}

/* 内容配图 */
.content-figure,
.page-figure,
.insight-figure {
  margin: 34px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
}

.content-figure img,
.page-figure img,
.insight-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--linen);
}

.content-figure figcaption,
.page-figure figcaption,
.insight-figure figcaption,
.figure-caption {
  padding: 12px 16px;
  font-size: 0.8rem;
  color: var(--ink-soft);
  line-height: 1.6;
  border-top: 1px solid var(--line);
}

/* 场景卡通用 */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.scene-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.scene-card h3 {
  font-size: 1.1rem;
}

.scene-card p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

/* 步骤轨道通用 */
.track-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  counter-reset: track;
}

.track-step {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.track-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--copper);
}

/* FAQ 通用 */
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  padding: 0;
  overflow: hidden;
}

.faq-item + .faq-item {
  margin-top: 12px;
}

.faq-item summary {
  cursor: pointer;
  padding: 14px 44px 14px 16px;
  font-weight: 600;
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1.5;
  position: relative;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: var(--copper);
  font-weight: 500;
}

.faq-item[open] summary::after {
  content: "−";
}

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

.faq-conclusion {
  padding: 0 16px 12px;
  font-size: 0.9rem;
  color: var(--ink);
  line-height: 1.7;
}

.faq-more,
.faq-detail {
  padding: 0 16px 16px;
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.75;
  border-top: 1px dashed var(--line);
  padding-top: 12px;
  margin-top: 4px;
}

.faq-detail p + p {
  margin-top: 8px;
}

/* 关联链接通用 */
.related-links,
.related-list,
.link-list,
.read-links,
.faq-next-links,
.next-step-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  margin-bottom: 56px;
}

.hero-intro {
  min-width: 0;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--copper);
  letter-spacing: 0.04em;
  margin: 0 0 12px;
}

.hero-intro h1 {
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 18px;
}

.hero-lead {
  font-size: 1rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 46ch;
  margin: 0 0 22px;
}

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

.hero-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--linen);
}

.hero-figure figcaption {
  padding: 10px 14px;
  font-size: 0.78rem;
  color: var(--ink-soft);
  line-height: 1.6;
  border-top: 1px solid var(--line);
}

/* 首屏目录面板 */
.directory-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  padding: 20px;
  min-width: 0;
}

.panel-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--moss);
  letter-spacing: 0.04em;
  margin: 0 0 12px;
}

.panel-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.panel-list li a {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
  padding: 9px 8px;
  border-radius: 4px;
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.45;
}

.panel-list li a:hover {
  background: var(--linen);
  color: var(--copper);
}

.panel-list li a .panel-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--copper);
  font-weight: 500;
}

.panel-reading {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.panel-subtitle {
  font-size: 0.78rem;
  color: var(--moss);
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  margin: 0 0 8px;
}

.panel-reading-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.panel-reading-list li a {
  font-size: 0.84rem;
  color: var(--ink-soft);
  line-height: 1.6;
  display: inline-block;
  padding: 3px 0;
}

.panel-reading-list li a:hover {
  color: var(--copper);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 通用 section 头（首页） */
.section-head {
  margin-bottom: 22px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--copper);
  letter-spacing: 0.04em;
  margin: 0 0 8px;
}

.section-head h2 {
  font-size: clamp(1.4rem, 2.2vw, 2rem);
  font-weight: 700;
  margin: 0 0 10px;
}

.section-lead {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 60ch;
}

/* 首页各区块间隔 */
.capability-matrix,
.scene-summary,
.method-track,
.delivery-summary,
.insight-index,
.faq-summary,
.prepare-entry {
  margin-bottom: 56px;
}

/* 首页场景卡信号列表与图 */
.scene-card .scene-signals {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.86rem;
  color: var(--ink-soft);
}

.scene-card .scene-signals li {
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}

.scene-card .scene-signals li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--copper);
  border-radius: 1px;
}

.scene-figure {
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  background: var(--linen);
}

.scene-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.scene-card .link-arrow {
  margin-top: auto;
}

/* 首页流程步骤 */
.method-track .track-step .track-task {
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.65;
}

.method-track .track-step .track-io {
  font-size: 0.8rem;
  color: var(--ink-soft);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.method-track .track-step .track-io .io-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--moss);
  letter-spacing: 0.03em;
}

/* 首页交付摘要 */
.delivery-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
}

.delivery-list-wrap,
.acceptance-wrap {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.delivery-list-wrap h3,
.acceptance-wrap h3 {
  font-size: 1.05rem;
  margin: 0 0 14px;
}

.delivery-list,
.acceptance-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.delivery-list li,
.acceptance-list li {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.65;
  padding-left: 18px;
  position: relative;
}

.delivery-list li::before,
.acceptance-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 7px;
  height: 7px;
  border: 1px solid var(--copper);
  border-radius: 1px;
}

.acceptance-list {
  counter-reset: acc;
}

.acceptance-list li {
  padding-left: 26px;
}

.acceptance-list li::before {
  counter-increment: acc;
  content: counter(acc);
  width: auto;
  height: auto;
  border: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--copper);
  top: 0.35em;
}

.print-hint {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.acceptance-wrap .link-arrow {
  margin-top: 14px;
}

/* 首页洞察索引 */
.insight-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.insight-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.insight-num {
  grid-row: 1 / span 4;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--copper);
}

.insight-item h3 {
  font-size: 1.02rem;
}

.insight-item p {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.insight-item .insight-scene {
  font-size: 0.8rem;
  color: var(--moss);
}

.insight-item .link-arrow {
  grid-column: 2 / 3;
  margin-top: 4px;
}

/* 首页 FAQ 摘要 */
.faq-list {
  display: flex;
  flex-direction: column;
}

.faq-summary > .link-arrow {
  margin-top: 18px;
}

/* 首页项目准备入口 */
.prepare-entry {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.prepare-text {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 62ch;
  margin: 0 0 16px;
}

.prepare-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.prepare-links a {
  font-weight: 600;
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   pages · 内页共用
   -------------------------------------------------------------------------- */

.inner-main > section {
  margin-bottom: 44px;
}

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

.inner-main h2 {
  font-size: clamp(1.4rem, 2.2vw, 2rem);
  font-weight: 700;
  margin: 0 0 12px;
}

.inner-main h3 {
  font-size: 1.1rem;
  font-weight: 650;
}

.section-intro,
.section-note {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 18px;
}

/* 起点页 */
.signal-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}

.signal-item {
  display: grid;
  grid-template-columns: minmax(140px, 0.4fr) minmax(0, 1fr);
  gap: 8px 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.signal-name {
  font-weight: 650;
  color: var(--ink);
  font-size: 0.98rem;
}

.signal-body {
  margin: 0;
  min-width: 0;
}

.signal-desc {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.signal-check {
  font-size: 0.84rem;
  color: var(--moss);
  line-height: 1.65;
  margin-top: 6px;
}

.prep-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.prep-item {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.prep-name {
  font-weight: 650;
  color: var(--ink);
  font-size: 0.96rem;
  margin: 0 0 6px;
}

.prep-purpose {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.prep-done {
  font-size: 0.82rem;
  color: var(--moss);
  margin-top: 6px;
}

.scope-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.scope-column {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.scope-column h3 {
  font-size: 1.02rem;
  margin: 0 0 12px;
}

.scope-fit h3 {
  color: var(--moss);
}

.scope-unfit h3 {
  color: var(--copper);
}

.scope-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.scope-list li {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.7;
  padding-left: 16px;
  position: relative;
}

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--line);
  border-radius: 1px;
}

.next-step-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.next-step-item {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.next-step-item a {
  font-weight: 600;
  font-size: 0.94rem;
}

.next-step-item p {
  font-size: 0.84rem;
  color: var(--ink-soft);
  line-height: 1.65;
  margin-top: 6px;
}

.related-links {
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  gap: 10px 18px;
}

.related-links-label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--moss);
  letter-spacing: 0.03em;
}

.related-links-item {
  font-size: 0.86rem;
  font-weight: 600;
}

/* 能力页 */
.capability-scope > p {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 12px;
}

.capability-matrix .section-note,
.capability-scenes .section-note {
  margin-bottom: 18px;
}

.scene-card .scene-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.86rem;
  color: var(--ink-soft);
}

.scene-card .scene-list li {
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}

.scene-card .scene-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--copper);
  border-radius: 1px;
}

.scene-link {
  margin-top: auto;
  padding-top: 4px;
}

.scene-link a {
  font-weight: 600;
  font-size: 0.86rem;
}

.capability-roles > p {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 18px;
}

.capability-link > p {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 14px;
}

.link-list li a {
  font-weight: 600;
  font-size: 0.9rem;
}

/* 方法页 */
.method-overview > p {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 12px;
}

.method-track .track-step .track-name {
  font-size: 1rem;
  font-weight: 650;
}

.method-track .track-step .track-desc {
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.65;
}

.stage-table-section > p {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 18px;
}

.confirm-points > p {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 18px;
}

.confirm-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.confirm-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.confirm-num {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--copper);
  font-weight: 500;
  display: block;
  margin-bottom: 4px;
}

.confirm-name {
  font-size: 1rem;
  margin: 0 0 8px;
}

.confirm-item p {
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.scope-note > p {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 14px;
}

.scope-note .scope-list {
  margin-bottom: 16px;
}

.scope-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
}

.scope-links a {
  font-weight: 600;
  font-size: 0.88rem;
}

/* 交付页 */
.section-desc {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 18px;
}

.section-deliverables .data-table {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
}

.check-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.check-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 10px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.check-num {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--copper);
  font-weight: 500;
  grid-row: 1 / span 2;
}

.check-body {
  min-width: 0;
}

.check-name {
  font-size: 0.98rem;
  margin: 0 0 6px;
}

.check-target {
  font-size: 0.85rem;
  color: var(--ink-soft);
  line-height: 1.65;
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.boundary-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.boundary-card h3 {
  font-size: 1.02rem;
  margin: 0 0 12px;
}

.boundary-included h3 {
  color: var(--moss);
}

.boundary-extra h3 {
  color: var(--copper);
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.boundary-list li {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.7;
  padding-left: 16px;
  position: relative;
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--line);
  border-radius: 1px;
}

.maintenance-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.maintenance-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

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

.maintenance-item p {
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.section-related .related-links li a {
  font-weight: 600;
  font-size: 0.9rem;
}

/* 洞察页 */
.topic-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.topic-item a {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 2px 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
}

.topic-item a:hover {
  border-color: var(--copper);
  color: var(--ink);
}

.topic-num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--copper);
  font-weight: 500;
}

.topic-name {
  font-weight: 650;
  font-size: 0.96rem;
}

.topic-question {
  font-size: 0.84rem;
  color: var(--ink-soft);
  line-height: 1.6;
}

.insight-note {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.note-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.note-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--copper);
  font-weight: 500;
  flex: 0 0 auto;
}

.note-head .section-title {
  margin: 0;
}

.note-body p {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 12px;
}

.note-points {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.note-points li {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.7;
  padding-left: 16px;
  position: relative;
}

.note-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--copper);
  border-radius: 1px;
}

.note-link a {
  font-weight: 600;
  font-size: 0.88rem;
}

.insight-source p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
}

.insight-related .related-list li a {
  font-weight: 600;
  font-size: 0.9rem;
}

/* 答疑页 */
.keypoints-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.keypoint {
  padding: 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--copper);
  border-radius: var(--radius);
  background: var(--white);
}

.keypoint-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--copper);
  font-weight: 500;
  display: block;
  margin-bottom: 6px;
}

.keypoint-text {
  font-size: 0.9rem;
  color: var(--ink);
  line-height: 1.7;
}

.faq-next-text {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 14px;
}

.faq-next-links li a {
  font-weight: 600;
  font-size: 0.9rem;
}

/* 联系页 */
.before-body p {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 12px;
}

.prepare-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.prepare-col {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.prepare-col-title {
  font-size: 1.02rem;
  margin: 0 0 12px;
  color: var(--moss);
}

.prepare-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.prepare-item {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.7;
  padding-left: 16px;
  position: relative;
}

.prepare-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--copper);
  border-radius: 1px;
}

.order-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.order-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.order-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--copper);
  line-height: 1.3;
}

.order-content {
  min-width: 0;
}

.order-title {
  font-size: 1rem;
  margin: 0 0 6px;
}

.order-text {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.scope-list .scope-item {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.scope-list .scope-item::before {
  display: none;
}

.scope-title {
  font-size: 0.98rem;
  margin: 0 0 6px;
  color: var(--copper);
}

.scope-text {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.read-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.read-item a {
  display: block;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
}

.read-item a:hover {
  border-color: var(--copper);
  color: var(--ink);
}

.read-name {
  display: block;
  font-weight: 650;
  font-size: 0.94rem;
  margin-bottom: 4px;
}

.read-desc {
  display: block;
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.6;
}

/* 404 */
.error-main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 64px 24px 80px;
  flex: 1 0 auto;
  width: 100%;
}

.error-panel {
  max-width: 620px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 3.4rem;
  font-weight: 500;
  color: var(--copper);
  line-height: 1;
  margin: 0 0 12px;
}

.error-panel h1 {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  margin: 0 0 14px;
}

.error-lead {
  font-size: 1rem;
  color: var(--ink-soft);
  line-height: 1.75;
  max-width: 52ch;
  margin: 0 0 24px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.error-home-link,
.error-secondary-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.92rem;
}

.error-home-link {
  background: var(--copper);
  color: var(--white);
}

.error-home-link:hover {
  background: var(--moss);
  color: var(--white);
}

.error-secondary-link {
  border: 1px solid var(--copper);
  color: var(--copper);
}

.error-secondary-link:hover {
  background: var(--copper);
  color: var(--white);
}

.error-guide {
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.error-guide h2 {
  font-size: 1.2rem;
  margin: 0 0 12px;
}

.error-guide-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}

.error-guide-list li a {
  font-weight: 600;
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1080px) {
  .page-layout,
  .page-layout.sidebar-left {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 28px;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }
}

@media (max-width: 900px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
  }

  .header-tagline {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .site-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    display: none;
  }

  .site-nav.is-open {
    display: block;
  }

  .header-nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 8px 0 4px;
    border-top: 1px solid var(--line);
  }

  .header-nav-item a {
    display: block;
    padding: 12px 10px;
    font-size: 0.95rem;
    min-height: 44px;
  }

  .header-nav-item.is-current a,
  .header-nav-item a.is-current {
    box-shadow: inset 3px 0 0 var(--copper);
    background: var(--linen);
  }

  .page-layout,
  .page-layout.sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 24px 20px 48px;
  }

  .sidebar-left .site-directory {
    order: 2;
  }

  .sidebar-left .site-main {
    order: 1;
  }

  .site-directory {
    position: static;
    border-right: 0;
    border-top: 1px solid var(--line);
    padding: 20px 0 0;
    padding-right: 0;
  }

  .directory-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .directory-item {
    flex: 1 1 140px;
    min-width: 0;
  }

  .directory-item a {
    grid-template-columns: 28px minmax(0, 1fr);
    padding: 10px;
    border: 1px solid var(--line);
    background: var(--white);
    min-height: 44px;
  }

  .directory-desc,
  .directory-q,
  .directory-note {
    display: none;
  }

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

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    padding: 32px 20px 24px;
  }

  .footer-brand,
  .footer-nav {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .footer-nav ul {
    justify-content: flex-start;
    gap: 8px 16px;
  }

  .footer-nav a {
    display: inline-block;
    padding: 6px 0;
    min-height: 32px;
  }

  .signal-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 15.5px;
  }

  .header-inner {
    padding: 10px 16px;
    min-height: 60px;
  }

  .brand-name {
    font-size: 1.05rem;
  }

  .page-layout,
  .page-layout.sidebar-left {
    padding: 20px 16px 40px;
    gap: 20px;
  }

  .page-title {
    font-size: clamp(1.7rem, 6.4vw, 2.2rem);
  }

  .hero-intro h1 {
    font-size: clamp(2rem, 8.4vw, 2.6rem);
  }

  .hero-actions {
    gap: 10px;
  }

  .btn-primary,
  .btn-ghost {
    width: 100%;
  }

  .hero {
    margin-bottom: 44px;
  }

  .capability-matrix,
  .scene-summary,
  .method-track,
  .delivery-summary,
  .insight-index,
  .faq-summary,
  .prepare-entry {
    margin-bottom: 44px;
  }

  .inner-main > section {
    margin-bottom: 36px;
  }

  .table-scroll {
    overflow-x: auto;
  }

  .matrix-table,
  .data-table,
  .roles-table {
    min-width: 520px;
    font-size: 0.84rem;
  }

  .matrix-table thead th,
  .data-table thead th,
  .roles-table thead th,
  .matrix-table tbody td,
  .data-table tbody td,
  .roles-table tbody td {
    padding: 10px 12px;
  }

  .insight-item {
    grid-template-columns: 34px minmax(0, 1fr);
    padding: 14px;
  }

  .topic-item a {
    grid-template-columns: 36px minmax(0, 1fr);
    padding: 12px 14px;
  }

  .prepare-entry {
    padding: 20px;
  }

  .insight-note {
    padding: 18px;
  }

  .error-main {
    padding: 44px 16px 56px;
  }

  .error-code {
    font-size: 2.6rem;
  }
}

@media (max-width: 480px) {
  .hero-intro h1 {
    font-size: clamp(1.85rem, 8.8vw, 2.3rem);
  }

  .directory-item {
    flex: 1 1 100%;
  }

  .check-item {
    grid-template-columns: 28px minmax(0, 1fr);
  }

  .order-step {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 10px;
  }

  .footer-nav ul {
    gap: 6px 14px;
  }
}

@media print {
  .site-header,
  .site-directory,
  .footer-nav,
  .menu-toggle,
  .hero-actions,
  .link-arrow {
    display: none !important;
  }

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

  .page-layout,
  .page-layout.sidebar-left {
    display: block;
    max-width: none;
    padding: 0;
  }

  .site-footer {
    background: #fff;
    border-top: 1px solid #999;
  }

  .footer-inner {
    display: block;
    padding: 16px 0 0;
  }

  .footer-note,
  .footer-copy {
    border-top: 0;
    padding-top: 6px;
  }

  a {
    color: #000;
    text-decoration: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}

/* 程序验收反馈：移动端防溢出 */
@media (max-width: 768px) {
  .site-main,
  .site-main * {
    min-width: 0;
    max-width: 100%;
  }

  .site-main :is(h1, h2, h3, h4, p, a, span) {
    overflow-wrap: anywhere;
  }
}