/* ==========================================================================
   91吃瓜 · 企业服务能力与交付体系官网
   全站样式表：base / layout / components / pages / responsive
   ========================================================================== */

/* ==========================================================================
   base · 变量与基础重置
   ========================================================================== */

:root {
  --c-navy: #0B2C4D;
  --c-navy-deep: #071E36;
  --c-orange: #E4572E;
  --c-teal: #137C8B;
  --c-bg: #F6F7F9;
  --c-surface: #FFFFFF;
  --c-text: #1B1F24;
  --c-text-soft: #4A5560;
  --c-border: #D8DEE6;
  --c-border-soft: #E7ECF1;

  --font-stack: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --container: 1180px;
  --radius: 6px;
  --radius-sm: 4px;

  --space-xs: 8px;
  --space-sm: 14px;
  --space-md: 22px;
  --space-lg: 34px;
  --space-xl: 52px;

  --shadow-card: 0 1px 2px rgba(11, 44, 77, 0.06);
}

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

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

body {
  margin: 0;
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--c-navy);
  font-weight: 700;
  line-height: 1.35;
}

p {
  margin: 0;
}

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

a {
  color: var(--c-navy);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

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

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

figure {
  margin: 0;
}

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

button {
  font-family: inherit;
}

:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 2px;
}

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

/* ==========================================================================
   layout · 容器与骨架
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.site-main {
  display: block;
}

.section {
  padding: var(--space-xl) 0;
}

.section-alt {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border-soft);
  border-bottom: 1px solid var(--c-border-soft);
}

/* 页头 */

.site-header {
  background: var(--c-navy);
  border-bottom: 3px solid var(--c-orange);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: #FFFFFF;
}

.brand:hover {
  color: #FFFFFF;
}

.brand-mark {
  width: 12px;
  height: 26px;
  border-radius: 2px;
  background: var(--c-orange);
  box-shadow: 6px 0 0 0 var(--c-teal);
  margin-right: 6px;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: #FFFFFF;
}

.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-block;
  padding: 10px 12px;
  font-size: 15px;
  color: #D7E1EC;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.nav-link:hover {
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.08);
}

.nav-link.is-current {
  color: #FFFFFF;
  background: rgba(228, 87, 46, 0.24);
  box-shadow: inset 0 -2px 0 0 var(--c-orange);
}

.header-cta {
  flex: 0 0 auto;
  display: inline-block;
  padding: 9px 18px;
  font-size: 15px;
  font-weight: 600;
  color: #FFFFFF;
  background: var(--c-orange);
  border-radius: var(--radius);
  white-space: nowrap;
}

.header-cta:hover {
  color: #FFFFFF;
  background: #C8461F;
}

.nav-toggle {
  display: none;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: #FFFFFF;
}

/* 内页外壳 */

.inner-main {
  display: block;
}

.breadcrumb {
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px 24px 0;
  font-size: 14px;
  color: var(--c-text-soft);
}

.breadcrumb a {
  color: var(--c-teal);
}

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

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--c-border);
}

.breadcrumb-current {
  color: var(--c-text-soft);
}

.page-header {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px 0;
}

.page-title {
  font-size: 40px;
  line-height: 1.25;
  color: var(--c-navy);
}

/* 页脚 */

.site-footer {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  padding: var(--space-xl) 0 0;
  margin-top: var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 10px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.footer-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 12px;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  font-size: 14px;
  color: var(--c-text-soft);
}

.footer-links a:hover {
  color: var(--c-orange);
}

.footer-scope p,
.footer-contact p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
  margin-bottom: 10px;
}

.footer-bottom {
  border-top: 1px solid var(--c-border-soft);
  padding: 16px 0;
}

.footer-bottom p {
  font-size: 13px;
  color: #6B7681;
}

/* ==========================================================================
   components · 通用组件
   ========================================================================== */

.btn {
  display: inline-block;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid transparent;
  text-align: center;
}

.btn-primary {
  background: var(--c-orange);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: #C8461F;
  color: #FFFFFF;
}

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

.btn-ghost:hover {
  color: var(--c-orange);
  border-color: var(--c-orange);
}

.section-head {
  margin-bottom: var(--space-lg);
}

.section-head h2 {
  font-size: 24px;
  margin-bottom: 10px;
}

.section-lead,
.section-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text-soft);
  max-width: 820px;
}

.section-title {
  font-size: 24px;
  margin-bottom: 10px;
}

.section-more {
  margin-top: var(--space-md);
}

.link-more {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-teal);
  border-bottom: 1px solid rgba(19, 124, 139, 0.4);
  padding-bottom: 2px;
}

.link-more:hover {
  color: var(--c-orange);
  border-color: var(--c-orange);
}

/* 图片容器 */

.hero-media,
.about-media,
.media-block,
.media-figure,
.scene-figure,
.section-figure,
.faq-visual {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.hero-media img,
.about-media img,
.media-block img,
.media-figure img,
.scene-figure img,
.section-figure img,
.faq-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: var(--c-border-soft);
}

.hero-media figcaption,
.about-media figcaption,
.media-block figcaption,
.media-figure figcaption,
.scene-figure figcaption,
.section-figure figcaption,
.faq-visual figcaption {
  padding: 10px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-text-soft);
  border-top: 1px solid var(--c-border-soft);
  background: var(--c-surface);
}

/* 页内锚点标签 */

.anchor-tabs,
.anchor-tags,
.page-anchor-tags,
.page-anchors .anchor-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.anchor-tab,
.anchor-tag,
.page-anchor-tags a,
.anchor-list a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--c-navy);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
}

.anchor-tab:hover,
.anchor-tag:hover,
.page-anchor-tags a:hover,
.anchor-list a:hover {
  color: var(--c-orange);
  border-color: var(--c-orange);
}

/* 相关推荐 */

.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
}

.related-item,
.related-list li {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-teal);
  border-radius: var(--radius);
  padding: 16px 18px;
  font-size: 15px;
  line-height: 1.7;
}

.related-item a,
.related-list li a {
  font-weight: 600;
  color: var(--c-navy);
}

.related-item a:hover,
.related-list li a:hover {
  color: var(--c-orange);
}

.related-list li span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--c-text-soft);
}

.related-links {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px var(--space-lg);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}

.related-links-label {
  color: var(--c-text-soft);
}

.related-links-item {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  background: var(--c-surface);
  color: var(--c-navy);
}

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

/* 检查清单 */

.check-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-text);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--c-teal);
}

/* FAQ 折叠 */

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px 16px 46px;
  position: relative;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-navy);
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::before {
  content: "+";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  line-height: 18px;
  text-align: center;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-orange);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
}

.faq-item[open] summary::before {
  content: "\2212";
}

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

.faq-item > p,
.faq-answer {
  padding: 0 20px 18px 46px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-text-soft);
}

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

/* ==========================================================================
   pages · 首页
   ========================================================================== */

.hero {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border-soft);
  padding: var(--space-xl) 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: var(--space-xl);
  align-items: center;
}

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

.hero-eyebrow {
  display: inline-block;
  padding: 5px 14px;
  margin-bottom: 18px;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-teal);
  background: rgba(19, 124, 139, 0.1);
  border-left: 3px solid var(--c-teal);
  border-radius: var(--radius-sm);
}

.hero-text h1 {
  font-size: 40px;
  line-height: 1.28;
  margin-bottom: 18px;
}

.hero-lead {
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-text-soft);
  max-width: 620px;
  margin-bottom: 26px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-md);
  padding-top: 22px;
  border-top: 1px solid var(--c-border-soft);
}

.hero-facts li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-soft);
  padding-left: 14px;
  border-left: 3px solid var(--c-orange);
}

.hero-media img {
  aspect-ratio: 4 / 3;
}

/* 服务能力总览 */

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-md);
}

.capability-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-top: 3px solid var(--c-teal);
  border-radius: var(--radius);
  padding: 22px 20px;
  box-shadow: var(--shadow-card);
}

.capability-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.capability-card p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.capability-deliverable {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--c-border);
  font-size: 14px;
  color: var(--c-navy);
}

/* 适用场景速览 */

.scenario-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.85fr);
  gap: var(--space-lg);
  align-items: start;
}

.scenario-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md);
}

.scenario-item {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.scenario-item h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.scenario-item p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.scenario-prepare {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-orange);
  border-radius: var(--radius);
  padding: 22px 22px;
}

.scenario-prepare h3 {
  font-size: 18px;
  margin-bottom: 14px;
}

.scenario-note {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--c-border);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

/* 合作推进路径 */

.process-timeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-sm);
  counter-reset: step;
}

.process-node {
  position: relative;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 20px 18px;
}

.process-node::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--c-orange);
  border-radius: var(--radius) var(--radius) 0 0;
}

.process-node .node-index {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-teal);
  margin-bottom: 8px;
}

.process-node h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.process-node p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

/* 交付标准要点 */

.standard-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-lg);
}

.standard-col {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px 22px;
}

.standard-col h3 {
  font-size: 18px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-border-soft);
}

.standard-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.standard-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-orange);
}

/* 关于与反馈入口 */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: var(--space-xl);
  align-items: center;
}

.about-text h2 {
  font-size: 24px;
  margin-bottom: 14px;
}

.about-text p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text-soft);
  margin-bottom: 14px;
}

.about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 10px;
}

.about-media img {
  aspect-ratio: 16 / 10;
}

/* ==========================================================================
   pages · 服务能力（capabilities）
   ========================================================================== */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: var(--space-lg);
  align-items: start;
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.page-layout.sidebar-left {
  grid-template-columns: 260px minmax(0, 1fr);
}

.main-column {
  min-width: 0;
}

.aside-tags,
.layout-aside {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 20px 18px;
}

.aside-title {
  font-size: 16px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-border-soft);
}

.tag-list li {
  margin-bottom: 8px;
}

.tag-link {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--c-navy);
  background: var(--c-bg);
  border-left: 3px solid var(--c-teal);
  border-radius: var(--radius-sm);
}

.tag-link:hover {
  color: var(--c-orange);
  background: rgba(228, 87, 46, 0.08);
  border-left-color: var(--c-orange);
}

.aside-note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--c-border);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.aside-note a {
  color: var(--c-teal);
  font-weight: 600;
}

.aside-note a:hover {
  color: var(--c-orange);
}

.page-title .page-kicker {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-orange);
  margin-bottom: 6px;
}

.page-title .page-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text-soft);
  max-width: 860px;
  margin-bottom: 18px;
}

.page-title .anchor-tabs {
  margin-top: 4px;
}

.capability-overview .section-title,
.capability-list .section-title,
.capability-choice .section-title {
  margin-bottom: 10px;
}

.capability-figure {
  margin: var(--space-md) 0;
}

.capability-figure img {
  aspect-ratio: 21 / 9;
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.overview-card {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 18px 18px;
}

.overview-index {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: #FFFFFF;
  background: var(--c-teal);
  padding: 2px 9px;
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
}

.overview-name {
  font-size: 17px;
  margin-bottom: 8px;
}

.overview-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.capability-list .section-title {
  margin-top: var(--space-lg);
}

.capability-item {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-teal);
  border-radius: var(--radius);
  padding: 22px 22px;
  margin-top: var(--space-md);
}

.capability-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.capability-name {
  font-size: 19px;
}

.capability-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 13px;
  color: var(--c-orange);
  background: rgba(228, 87, 46, 0.1);
  border: 1px solid rgba(228, 87, 46, 0.32);
  border-radius: var(--radius-sm);
}

.capability-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-text-soft);
}

.capability-meta {
  margin: 16px 0 0;
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 8px 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--c-border);
  font-size: 14px;
}

.capability-meta dt {
  color: var(--c-navy);
  font-weight: 600;
}

.capability-meta dd {
  margin: 0;
  color: var(--c-text-soft);
  line-height: 1.8;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.choice-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-top: 3px solid var(--c-orange);
  border-radius: var(--radius);
  padding: 20px 18px;
}

.choice-name {
  font-size: 17px;
  margin-bottom: 8px;
}

.choice-text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.section-foot {
  margin-top: var(--space-md);
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 15px;
}

.section-foot a {
  color: var(--c-teal);
  font-weight: 600;
}

.section-foot a:hover {
  color: var(--c-orange);
}

/* ==========================================================================
   pages · 适用场景（scenarios）
   ========================================================================== */

.page-layout .layout-main {
  min-width: 0;
}

.scene-group .section-head,
.scene-prepare .section-head,
.scene-match .section-head {
  margin-bottom: var(--space-md);
}

.scene-figure {
  margin-bottom: var(--space-md);
}

.scene-figure img {
  aspect-ratio: 21 / 9;
}

.scene-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md);
}

.scene-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 20px 20px;
}

.scene-card h3 {
  font-size: 17px;
  margin-bottom: 10px;
}

.scene-standard {
  font-size: 14px;
  color: var(--c-orange);
  background: rgba(228, 87, 46, 0.08);
  border-left: 3px solid var(--c-orange);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
}

.scene-card > p:last-child {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.scene-prepare {
  margin-top: var(--space-xl);
}

.prepare-table {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-surface);
}

.prepare-row {
  display: grid;
  grid-template-columns: minmax(140px, 0.8fr) minmax(0, 1.1fr) minmax(0, 1.1fr);
  border-top: 1px solid var(--c-border-soft);
}

.prepare-row:first-child {
  border-top: 0;
}

.prepare-row span {
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-text-soft);
  border-left: 1px solid var(--c-border-soft);
  min-width: 0;
}

.prepare-row span:first-child {
  border-left: 0;
  color: var(--c-navy);
  font-weight: 600;
}

.prepare-head {
  background: var(--c-navy);
}

.prepare-head span {
  color: #FFFFFF;
  font-weight: 600;
  border-left-color: rgba(255, 255, 255, 0.16);
}

.prepare-head span:first-child {
  color: #FFFFFF;
}

.scene-match {
  margin-top: var(--space-xl);
}

.match-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-md);
}

.match-col {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 20px 20px;
}

.match-col h3 {
  font-size: 17px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-border-soft);
}

.match-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.match-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-border);
}

.match-yes {
  border-top: 3px solid var(--c-teal);
}

.match-yes .match-list li::before {
  background: var(--c-teal);
}

.match-check {
  border-top: 3px solid var(--c-orange);
}

.match-check .match-list li::before {
  background: var(--c-orange);
}

.match-no {
  border-top: 3px solid #8A94A0;
}

.layout-aside .aside-index li {
  margin-bottom: 8px;
}

.layout-aside .aside-index a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--c-navy);
  background: var(--c-bg);
  border-left: 3px solid var(--c-teal);
  border-radius: var(--radius-sm);
}

.layout-aside .aside-index a:hover {
  color: var(--c-orange);
  border-left-color: var(--c-orange);
}

.layout-aside .aside-note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--c-border);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.layout-aside .aside-note p {
  margin-bottom: 10px;
}

.aside-link {
  display: inline-block;
  margin-right: 12px;
  font-weight: 600;
  color: var(--c-teal);
}

.aside-link:hover {
  color: var(--c-orange);
}

/* ==========================================================================
   pages · 合作流程（process）
   ========================================================================== */

.process-overview .section-head,
.process-detail .section-head,
.process-obstacles .section-head {
  margin-bottom: var(--space-md);
}

.section-figure {
  margin-bottom: var(--space-lg);
}

.section-figure img {
  aspect-ratio: 21 / 9;
}

.process-timeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-sm);
}

.timeline-node {
  position: relative;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 20px 18px;
}

.timeline-node::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--c-teal);
  border-radius: var(--radius) var(--radius) 0 0;
}

.timeline-node .node-index {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-orange);
  margin-bottom: 8px;
}

.node-title {
  font-size: 17px;
  margin-bottom: 8px;
}

.node-duty {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.io-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.io-table {
  min-width: 660px;
}

.io-table th,
.io-table td {
  padding: 14px 16px;
  text-align: left;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-text-soft);
  border-bottom: 1px solid var(--c-border-soft);
  vertical-align: top;
}

.io-table thead th {
  background: var(--c-navy);
  color: #FFFFFF;
  font-weight: 600;
  white-space: nowrap;
}

.io-table tbody th {
  color: var(--c-navy);
  font-weight: 600;
  white-space: nowrap;
}

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

.obstacle-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md);
}

.obstacle-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-orange);
  border-radius: var(--radius);
  padding: 20px 20px;
}

.obstacle-title {
  font-size: 17px;
  margin-bottom: 10px;
}

.obstacle-issue {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--c-border);
  margin-bottom: 10px;
}

.obstacle-fix {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-navy);
}

.process-detail .related-list,
.process-obstacles .related-list {
  margin-top: 0;
}

/* ==========================================================================
   pages · 交付标准（standards）
   ========================================================================== */

.page-title-block {
  padding-top: 16px;
}

.page-title-block .page-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text-soft);
  max-width: 860px;
  margin-bottom: 18px;
}

.deliverables-section .section-head,
.checkpoints-section .section-head,
.acceptance-section .section-head {
  margin-bottom: var(--space-md);
}

.media-figure {
  margin-bottom: var(--space-lg);
}

.media-figure img {
  aspect-ratio: 21 / 9;
}

.deliverable-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md);
}

.deliverable-item {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-top: 3px solid var(--c-teal);
  border-radius: var(--radius);
  padding: 20px 20px;
}

.deliverable-item h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.deliverable-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.checkpoint-table {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-surface);
}

.checkpoint-table th,
.checkpoint-table td {
  padding: 14px 16px;
  text-align: left;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-text-soft);
  border-bottom: 1px solid var(--c-border-soft);
  vertical-align: top;
}

.checkpoint-table thead th {
  background: var(--c-navy);
  color: #FFFFFF;
  font-weight: 600;
}

.checkpoint-table tbody th {
  color: var(--c-navy);
  font-weight: 600;
  white-space: nowrap;
}

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

.acceptance-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-lg);
}

.acceptance-col {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px 22px;
}

.acceptance-col h3 {
  font-size: 18px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-border-soft);
}

.acceptance-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.acceptance-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-teal);
}

.section-cta {
  margin-top: var(--space-lg);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-orange);
  border-radius: var(--radius);
  padding: 24px 24px;
}

.section-cta p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-text-soft);
  margin-bottom: 16px;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.related-section .related-list {
  margin-top: var(--space-md);
}

/* ==========================================================================
   pages · 常见问题（faq）
   ========================================================================== */

.page-hero {
  padding-top: 16px;
}

.page-hero-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.page-hero-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-orange);
  margin-bottom: 8px;
}

.page-hero-desc {
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text-soft);
  max-width: 860px;
  margin-bottom: 18px;
}

.faq-visual {
  max-width: var(--container);
  margin: var(--space-lg) auto 0;
}

.faq-visual img {
  aspect-ratio: 21 / 9;
}

.faq-group {
  padding: var(--space-xl) 0 0;
}

.faq-group .section-head {
  margin-bottom: var(--space-md);
}

/* ==========================================================================
   pages · 关于我们（about）
   ========================================================================== */

.page-title-section {
  padding-top: 16px;
}

.page-subtitle {
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text-soft);
  max-width: 860px;
  margin-bottom: 18px;
}

.about-positioning {
  padding: var(--space-xl) 0 0;
}

.about-positioning-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.8fr);
  gap: var(--space-lg);
  align-items: start;
}

.about-positioning-text .section-title {
  margin-bottom: 14px;
}

.about-positioning-text p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text-soft);
  margin-bottom: 14px;
}

.about-positioning-summary {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-teal);
  border-radius: var(--radius);
  padding: 22px 20px;
}

.summary-title {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-border-soft);
}

.summary-list {
  margin: 0 0 18px;
}

.summary-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--c-border-soft);
  font-size: 14px;
}

.summary-item:last-child {
  border-bottom: 0;
}

.summary-item dt {
  color: var(--c-navy);
  font-weight: 600;
}

.summary-item dd {
  margin: 0;
  color: var(--c-text-soft);
  line-height: 1.75;
}

.boundary-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--c-orange);
}

.about-principles {
  padding: var(--space-xl) 0 0;
}

.about-principles .section-title {
  margin-bottom: 10px;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.principle-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-top: 3px solid var(--c-orange);
  border-radius: var(--radius);
  padding: 20px 18px;
}

.principle-index {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: #FFFFFF;
  background: var(--c-navy);
  padding: 2px 9px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.principle-title {
  font-size: 17px;
  margin-bottom: 8px;
}

.principle-card p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.about-principles .about-media {
  margin-top: var(--space-lg);
}

.about-principles .about-media img {
  aspect-ratio: 21 / 9;
}

.about-contact-guide {
  padding: var(--space-xl) 0 0;
}

.about-contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-lg);
}

.contact-guide-block {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-teal);
  border-radius: var(--radius);
  padding: 24px 22px;
}

.contact-guide-block .section-title {
  margin-bottom: 12px;
}

.contact-guide-block p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-text-soft);
  margin-bottom: 12px;
}

.contact-guide-block p:last-child {
  margin-bottom: 0;
}

.related-section {
  padding: var(--space-xl) 0 0;
}

.related-section .related-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  padding: 0;
  margin-top: var(--space-md);
}

.related-section .related-links li {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-teal);
  border-radius: var(--radius);
  padding: 16px 18px;
  font-size: 15px;
}

.related-section .related-links a {
  font-weight: 600;
}

/* ==========================================================================
   pages · 404
   ========================================================================== */

.error-main {
  padding: var(--space-xl) 0;
}

.error-panel {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-top: 3px solid var(--c-orange);
  border-radius: var(--radius);
  padding: 48px 32px;
  text-align: center;
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-teal);
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: 28px;
  margin-bottom: 14px;
}

.error-desc {
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text-soft);
  max-width: 640px;
  margin: 0 auto 26px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-bottom: 30px;
}

.error-links {
  padding-top: 24px;
  border-top: 1px solid var(--c-border-soft);
}

.error-links ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.error-links a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 14px;
  color: var(--c-navy);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  background: var(--c-bg);
}

.error-links a:hover {
  color: var(--c-orange);
  border-color: var(--c-orange);
}

/* ==========================================================================
   responsive · 平板与手机
   ========================================================================== */

@media (max-width: 1080px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (max-width: 960px) {
  .header-inner {
    flex-wrap: wrap;
    row-gap: 10px;
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .site-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .nav-list {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 10px 0 4px;
    border-top: 1px solid rgba(255, 255, 255, 0.16);
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-link {
    padding: 12px 14px;
    min-height: 44px;
  }

  .header-cta {
    order: 2;
  }

  .hero-grid,
  .about-grid,
  .scenario-layout,
  .about-positioning-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-lg);
  }

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

  .capability-grid,
  .standard-columns,
  .scene-cards,
  .deliverable-list,
  .acceptance-grid,
  .obstacle-grid,
  .about-contact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 720px) {
  .container,
  .header-inner,
  .breadcrumb,
  .page-header,
  .page-hero-inner,
  .related-links,
  .faq-visual {
    padding-left: 16px;
    padding-right: 16px;
  }

  .faq-visual {
    margin-top: var(--space-md);
  }

  .page-title {
    font-size: 28px;
  }

  .hero {
    padding: var(--space-lg) 0;
  }

  .hero-text h1 {
    font-size: 28px;
  }

  .hero-lead {
    font-size: 16px;
  }

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

  .section {
    padding: var(--space-lg) 0;
  }

  .section-head h2,
  .section-title,
  .about-text h2 {
    font-size: 21px;
  }

  .capability-grid,
  .standard-columns,
  .scene-cards,
  .deliverable-list,
  .acceptance-grid,
  .obstacle-grid,
  .about-contact-grid,
  .overview-grid,
  .choice-grid,
  .match-columns,
  .scenario-list,
  .principles-grid,
  .process-timeline {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .capability-meta dd {
    margin-bottom: 8px;
  }

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

  .prepare-table {
    border: 0;
    background: transparent;
  }

  .prepare-row,
  .prepare-head {
    display: block;
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    background: var(--c-surface);
    margin-bottom: 12px;
    overflow: hidden;
  }

  .prepare-head {
    display: none;
  }

  .prepare-row span {
    display: block;
    border-left: 0;
    border-top: 1px solid var(--c-border-soft);
    padding: 12px 14px;
  }

  .prepare-row span:first-child {
    border-top: 0;
    background: var(--c-bg);
  }

  .io-table,
  .checkpoint-table {
    min-width: 0;
  }

  .io-table thead,
  .checkpoint-table thead {
    display: none;
  }

  .io-table tbody tr,
  .checkpoint-table tbody tr {
    display: block;
    border-bottom: 1px solid var(--c-border-soft);
    padding: 6px 0;
  }

  .io-table tbody tr:last-child,
  .checkpoint-table tbody tr:last-child {
    border-bottom: 0;
  }

  .io-table tbody th,
  .io-table tbody td,
  .checkpoint-table tbody th,
  .checkpoint-table tbody td {
    display: block;
    border-bottom: 0;
    padding: 8px 16px;
    white-space: normal;
  }

  .io-table tbody th,
  .checkpoint-table tbody th {
    background: var(--c-bg);
  }

  .error-panel {
    padding: 34px 20px;
  }

  .error-code {
    font-size: 48px;
  }

  .error-panel h1 {
    font-size: 22px;
  }

  .btn,
  .header-cta {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .faq-item summary {
    padding: 14px 16px 14px 44px;
    font-size: 15px;
  }

  .faq-item > p,
  .faq-answer {
    padding: 0 16px 16px 44px;
  }
}

@media (max-width: 400px) {
  .brand-name {
    font-size: 18px;
  }

  .nav-link {
    font-size: 14px;
  }

  .hero-text h1 {
    font-size: 25px;
  }

  .page-title {
    font-size: 25px;
  }
}