/* ==========================================================================
   base — 基础变量、重置与全局字体
   ========================================================================== */

:root {
  --color-ink: #16222e;
  --color-ink-light: #2d3b49;
  --color-ink-soft: #4a5a68;
  --color-amber: #d97706;
  --color-amber-dark: #b45f06;
  --color-amber-light: #fdf3e3;
  --color-paper: #f7f5f0;
  --color-white: #ffffff;
  --color-text: #262626;
  --color-text-soft: #5c6670;
  --color-line: #e3ddd2;
  --color-line-dark: #cfc7b9;
  --color-tag-bg: #f0ece3;

  --font-serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --container-width: 1200px;
  --container-pad: 24px;
  --header-height: 68px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 1px 3px rgba(22, 34, 46, 0.06), 0 4px 14px rgba(22, 34, 46, 0.04);
  --shadow-hover: 0 4px 12px rgba(22, 34, 46, 0.1), 0 8px 24px rgba(22, 34, 46, 0.06);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
figure {
  display: block;
}

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

a {
  color: var(--color-amber);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-amber-dark);
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.4;
}

/* ==========================================================================
   layout — 全站骨架容器
   ========================================================================== */

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-paper);
}

.site-header {
  background-color: var(--color-ink);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

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

.logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background-color: var(--color-amber);
  color: var(--color-white);
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  letter-spacing: 0;
}

.logo-link::after {
  content: "大象传媒";
  margin-left: 10px;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.82);
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-list li a:hover {
  color: var(--color-white);
}

.nav-list li a.is-current {
  color: var(--color-white);
  border-bottom-color: var(--color-amber);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: 12px;
  padding: 8px 18px;
  background-color: var(--color-amber);
  color: var(--color-white) !important;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
  white-space: nowrap;
}

.nav-cta:hover {
  background-color: var(--color-amber-dark);
  color: var(--color-white) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-main {
  flex: 1 0 auto;
}

.site-footer {
  background-color: var(--color-ink);
  color: rgba(255, 255, 255, 0.72);
  margin-top: 0;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px var(--container-pad) 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.9;
  margin-top: 12px;
  max-width: 360px;
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-top: 0 !important;
}

.footer-col h3 {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 16px;
  letter-spacing: 0;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
}

.footer-col ul li a:hover {
  color: var(--color-white);
}

.footer-bottom {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 20px var(--container-pad) 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
  text-align: center;
}

/* ==========================================================================
   layout — 内页统一骨架
   ========================================================================== */

.inner-main {
  background-color: var(--color-paper);
}

.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 20px var(--container-pad) 0;
  font-size: 13px;
  color: var(--color-text-soft);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

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

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

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

.page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px var(--container-pad) 32px;
}

.page-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.3;
}

.page-description {
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-soft);
  max-width: 780px;
}

.page-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 64px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

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

.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 64px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

/* materials 页：侧栏在左 */
.sidebar-left .page-layout,
.sidebar-left {
  grid-template-columns: 260px minmax(0, 1fr);
}

.sidebar-left .page-layout {
  display: grid;
}

/* 结论侧栏（projects 页，在右） */
.conclusion-sidebar {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.conclusion-sidebar h2 {
  font-size: 20px;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-line);
}

.conclusion-sidebar p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-soft);
  margin-bottom: 12px;
}

.conclusion-sidebar ul {
  margin: 12px 0 16px;
}

.conclusion-sidebar ul li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-soft);
  margin-bottom: 8px;
}

.conclusion-sidebar ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background-color: var(--color-amber);
  border-radius: 50%;
}

.conclusion-sidebar ul li strong {
  color: var(--color-ink);
  font-weight: 600;
  display: block;
}

.next-step {
  font-size: 14px;
  color: var(--color-text) !important;
  background-color: var(--color-amber-light);
  border-left: 3px solid var(--color-amber);
  padding: 12px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 8px;
  padding: 10px 20px;
  background-color: var(--color-amber);
  color: var(--color-white) !important;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.button-link:hover {
  background-color: var(--color-amber-dark);
}

/* ==========================================================================
   components — 通用组件
   ========================================================================== */

.section-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 16px;
}

.section-intro {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
  max-width: 760px;
  margin-bottom: 32px;
}

.section-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 0;
}

.section-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

.section-link:hover::after {
  transform: translateX(4px);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  margin-top: 12px;
}

.card-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

.card-link:hover::after {
  transform: translateX(4px);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  margin-top: 12px;
}

.text-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

.text-link:hover::after {
  transform: translateX(4px);
}

/* 结论标签 */
.conclusion-tag {
  display: inline-block;
  background-color: var(--color-ink);
  color: var(--color-white);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  letter-spacing: 0;
}

/* FAQ 折叠 */
.faq-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  margin-bottom: 10px;
  overflow: hidden;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-amber);
  flex-shrink: 0;
  transition: transform 0.25s ease;
  line-height: 1;
}

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

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

/* 步骤条 */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 24px 0 32px;
}

.process-step {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background-color: var(--color-amber);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 12px;
  font-family: var(--font-serif);
}

.process-step h3,
.cooperate-step-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.process-step p,
.cooperate-step-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

/* 按钮 */
.btn,
.btn-primary,
.btn-secondary,
.action-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--color-amber);
  color: var(--color-white) !important;
}

.btn-primary:hover {
  background-color: var(--color-amber-dark);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-amber) !important;
  border-color: var(--color-amber);
}

.btn-secondary:hover {
  background-color: var(--color-amber-light);
}

.action-button {
  background-color: var(--color-amber);
  color: var(--color-white) !important;
  min-height: 44px;
}

.action-button:hover {
  background-color: var(--color-amber-dark);
}

/* ==========================================================================
   components — 首页模块
   ========================================================================== */

.home-main {
  overflow: visible;
}

/* --- 首屏问题区 --- */
.hero-section {
  background-color: var(--color-ink);
  color: var(--color-white);
}

.hero-section .hero-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px var(--container-pad) 48px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 56px;
  align-items: center;
}

.hero-section h1 {
  font-size: 34px;
  line-height: 1.35;
  color: var(--color-white);
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: 28px;
  max-width: 540px;
}

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

.demand-item {
  border-left: 3px solid var(--color-amber);
  padding: 14px 16px;
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.demand-question {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 4px;
}

.demand-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-amber);
}

.demand-link:hover {
  color: #f59e0b;
}

.hero-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
}

.hero-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.hero-media figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px 20px;
  font-size: 13px;
  color: var(--color-white);
  background: linear-gradient(to top, rgba(22, 34, 46, 0.85), transparent);
  line-height: 1.6;
}

/* --- 对象选择比较区 --- */
.compare-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px var(--container-pad) 24px;
}

.compare-section > h2 {
  font-size: 26px;
  margin-bottom: 28px;
}

.compare-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

.compare-main {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-card);
}

.object-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 16px;
  flex-wrap: wrap;
}

.object-tab {
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 600;
  background-color: transparent;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-text-soft);
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 40px;
}

.object-tab:hover {
  border-color: var(--color-amber);
  color: var(--color-amber);
}

.object-tab.is-active {
  background-color: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-white);
}

.compare-table {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.compare-row {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line);
}

.compare-row:last-child {
  border-bottom: none;
}

.dimension-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  padding-top: 2px;
}

.dimension-value {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.compare-sidebar {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
}

.compare-sidebar p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-soft);
  margin-bottom: 12px;
}

.compare-sidebar a {
  font-weight: 600;
}

/* --- 服务概览 --- */
.services-overview {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-pad) 24px;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.service-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.service-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.service-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-amber);
  display: inline-block;
}

.service-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
  margin-bottom: 12px;
}

.service-card .deliverable {
  font-size: 13px;
  color: var(--color-text);
  background-color: var(--color-tag-bg);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  line-height: 1.6;
}

/* --- 项目纪事精选 --- */
.projects-featured {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-pad) 24px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.project-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.25s ease;
}

.project-card:hover {
  box-shadow: var(--shadow-hover);
}

.project-media {
  overflow: hidden;
}

.project-media img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.project-card:hover .project-media img {
  transform: scale(1.03);
}

.project-body {
  padding: 24px;
}

.stage-tag {
  display: inline-block;
  background-color: var(--color-amber-light);
  color: var(--color-amber-dark);
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.project-body h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.project-body p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

/* --- 合作指引摘要 --- */
.guide-summary {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-pad) 24px;
}

.guide-summary .process-steps {
  margin-bottom: 24px;
}

.faq-preview {
  margin-bottom: 20px;
}

/* --- 方法文档入口 --- */
.materials-entry {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-pad) 24px;
}

.materials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.material-card {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.material-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.material-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--color-ink);
}

.material-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.material-card::after {
  content: "查看文档 →";
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-amber);
}

/* --- 行动引导条 --- */
.action-bar {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px var(--container-pad) 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.action-bar p {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  font-family: var(--font-serif);
}

/* 相关链接条 */
.related-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 56px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.related-links-label {
  font-size: 13px;
  color: var(--color-text-soft);
  margin-right: 4px;
}

.related-links-item {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-amber);
}

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

/* ==========================================================================
   components — 服务项目页
   ========================================================================== */

.service-anchor-index {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 40px;
}

.anchor-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.anchor-item {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  text-align: center;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.anchor-item:hover {
  border-color: var(--color-amber);
  background-color: var(--color-amber-light);
  color: var(--color-amber-dark);
}

.service-detail-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-pad);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 40px;
  align-items: center;
  border-bottom: 1px solid var(--color-line);
}

.service-detail-block:nth-child(even) {
  grid-template-columns: 360px minmax(0, 1fr);
}

.service-detail-block:nth-child(even) .service-detail-media {
  order: 1;
}

.service-detail-block:nth-child(even) .service-detail-info {
  order: 2;
}

.service-name {
  font-size: 24px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-amber);
  display: inline-block;
}

.service-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.detail-item h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.detail-item h3::before {
  content: "";
  width: 6px;
  height: 6px;
  background-color: var(--color-amber);
  border-radius: 50%;
  flex-shrink: 0;
}

.detail-item p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.service-detail-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.service-detail-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.service-detail-media figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-soft);
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-top: none;
  line-height: 1.6;
}

.service-collab-note {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-pad) 64px;
}

.service-collab-note p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
  max-width: 820px;
  margin-bottom: 24px;
}

.note-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.note-links a {
  font-size: 14px;
  font-weight: 600;
}

/* ==========================================================================
   components — 项目纪事页
   ========================================================================== */

.project-type-index {
  margin-bottom: 32px;
}

.type-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.type-tab {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 600;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-text-soft);
  transition: all 0.2s ease;
  min-height: 40px;
}

.type-tab:hover {
  border-color: var(--color-amber);
  color: var(--color-amber);
}

.records-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.record-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 0;
}

.record-media {
  overflow: hidden;
}

.record-media img {
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
}

.record-body {
  padding: 24px 28px;
}

.record-body h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

.record-phase {
  display: inline-block;
  background-color: var(--color-amber-light);
  color: var(--color-amber-dark);
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.record-body > p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-soft);
  margin-bottom: 12px;
}

.record-method,
.record-standard {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-soft);
  padding: 8px 12px;
  background-color: var(--color-tag-bg);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.record-method::before {
  content: "方法：";
  font-weight: 600;
  color: var(--color-ink);
}

.record-standard::before {
  content: "交付标准：";
  font-weight: 600;
  color: var(--color-ink);
}

/* ==========================================================================
   components — 协作团队页
   ========================================================================== */

.role-matrix-section,
.collab-mechanism-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 48px;
}

.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.section-heading p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
  max-width: 720px;
}

.role-matrix-table-wrap {
  overflow-x: auto;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.role-matrix-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.role-matrix-table th,
.role-matrix-table td {
  padding: 16px 20px;
  text-align: left;
  vertical-align: top;
  font-size: 14px;
  line-height: 1.7;
  border-bottom: 1px solid var(--color-line);
}

.role-matrix-table thead th {
  background-color: var(--color-ink);
  color: var(--color-white);
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0;
}

.role-matrix-table tbody tr:last-child th,
.role-matrix-table tbody tr:last-child td {
  border-bottom: none;
}

.role-matrix-table tbody th {
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--color-ink);
  background-color: var(--color-tag-bg);
  width: 100px;
}

.role-matrix-table tbody td {
  color: var(--color-text-soft);
}

.role-matrix-table tbody td:first-of-type {
  font-weight: 600;
  color: var(--color-text);
}

.collab-content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 40px;
  align-items: start;
}

.collab-text-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.collab-principle {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.collab-principle h3 {
  font-size: 16px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.collab-principle h3::before {
  content: "";
  width: 8px;
  height: 8px;
  background-color: var(--color-amber);
  border-radius: 50%;
  flex-shrink: 0;
}

.collab-principle p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.collab-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.collab-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.collab-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-soft);
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-top: none;
  line-height: 1.6;
}

.start-entry-section {
  background-color: var(--color-ink);
  margin-top: 16px;
}

.start-entry-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px var(--container-pad);
  text-align: center;
}

.start-entry-inner h2 {
  font-size: 24px;
  color: var(--color-white);
  margin-bottom: 10px;
}

.start-entry-inner p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 24px;
}

.start-entry-inner .btn {
  margin: 0 8px;
}

/* ==========================================================================
   components — 合作指引页
   ========================================================================== */

.cooperate-card {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 48px;
}

.cooperate-card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.cooperate-card-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  box-shadow: var(--shadow-card);
}

.cooperate-card-item h3 {
  font-size: 15px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-amber);
  display: inline-block;
}

.cooperate-card-item p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.cooperate-steps {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 48px;
}

.cooperate-steps-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.cooperate-step-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
}

.cooperate-step-item .step-num {
  margin-bottom: 10px;
}

.prepare-materials {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 48px;
}

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

.material-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
}

.material-item h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
  position: relative;
  padding-left: 16px;
}

.material-item h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background-color: var(--color-amber);
  border-radius: 50%;
}

.material-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.template-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 48px;
}

.template-desc {
  font-size: 14px;
  color: var(--color-text-soft);
  margin-bottom: 16px;
}

.template-copy-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  box-shadow: var(--shadow-card);
  position: relative;
}

.template-copy-block p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 8px;
}

.template-copy-block p:last-child {
  margin-bottom: 0;
}

.faq-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 48px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.cooperate-note {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 64px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 40px;
  align-items: center;
}

.cooperate-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  order: 2;
}

.cooperate-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.cooperate-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-soft);
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-top: none;
  line-height: 1.6;
}

.cooperate-footnote {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-soft);
  order: 1;
}

.cooperate-footnote a {
  display: inline-block;
  margin-right: 16px;
  margin-top: 8px;
  font-weight: 600;
}

/* ==========================================================================
   components — 方法文档页
   ========================================================================== */

/* materials 页使用 .sidebar-left 让侧栏在左 */
.materials .layout-shell,
.sidebar-left {
  grid-template-columns: 260px minmax(0, 1fr);
}

.doc-categories {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  box-shadow: var(--shadow-card);
  position: sticky;
  top: calc(var(--header-height) + 24px);
  align-self: start;
}

.doc-categories h2 {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.category-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.category-list li a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-soft);
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition: all 0.2s ease;
}

.category-list li a:hover {
  background-color: var(--color-amber-light);
  color: var(--color-amber-dark);
  border-left-color: var(--color-amber);
}

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

.doc-group {
  margin-bottom: 32px;
}

.doc-group h2 {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-line);
  position: relative;
}

.doc-group h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 48px;
  height: 2px;
  background-color: var(--color-amber);
}

.doc-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.doc-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease;
}

.doc-item:hover {
  box-shadow: var(--shadow-hover);
}

.doc-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.doc-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
  margin-bottom: 10px;
}

.doc-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-amber-dark);
  background-color: var(--color-amber-light);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
}

.doc-figure {
  margin-top: 32px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.doc-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.doc-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-soft);
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-top: none;
  line-height: 1.6;
}

.doc-usage {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 48px;
}

.usage-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.usage-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.usage-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.usage-item h3::before {
  content: "";
  width: 8px;
  height: 8px;
  background-color: var(--color-amber);
  border-radius: 50%;
  flex-shrink: 0;
}

.usage-item p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.doc-entry-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 48px;
  font-size: 14px;
  color: var(--color-text-soft);
}

.doc-entry-links a {
  font-weight: 600;
  margin: 0 8px;
}

/* ==========================================================================
   components — 404 页
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px var(--container-pad);
  background-color: var(--color-paper);
}

.error-section {
  text-align: center;
  max-width: 560px;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 96px;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 28px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-soft);
  margin-bottom: 32px;
  line-height: 1.8;
}

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

/* ==========================================================================
   responsive — 响应式
   ========================================================================== */

/* --- 平板：≤1024px --- */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cooperate-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cooperate-steps-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .service-detail-block {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 28px;
  }

  .service-detail-block:nth-child(even) {
    grid-template-columns: 300px minmax(0, 1fr);
  }

  .collab-content-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 28px;
  }

  .cooperate-note {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 28px;
  }

  .doc-list {
    grid-template-columns: 1fr;
  }

  .hero-section .hero-content {
    gap: 36px;
  }
}

/* --- 手机：≤768px --- */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 10px var(--container-pad);
    gap: 0;
  }

  .logo-link {
    margin-right: auto;
  }

  .logo-mark {
    width: 34px;
    height: 34px;
    font-size: 16px;
  }

  .logo-link::after {
    font-size: 18px;
  }

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

  .site-nav {
    width: 100%;
    display: block;
    position: relative;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 0 0;
    width: 100%;
  }

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

  .nav-list li a {
    padding: 12px 8px;
    font-size: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    border-left: 3px solid transparent;
  }

  .nav-list li a.is-current {
    border-left-color: var(--color-amber);
    border-bottom-color: rgba(255, 255, 255, 0.08);
  }

  .nav-cta {
    display: none;
  }

  /* 面包屑 */
  .breadcrumb {
    padding-top: 14px;
    font-size: 12px;
  }

  /* 页面标题区 */
  .page-header {
    padding: 28px var(--container-pad) 24px;
  }

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

  .page-description {
    font-size: 15px;
    margin-top: 10px;
  }

  /* 首页 hero */
  .hero-section .hero-content {
    grid-template-columns: 1fr;
    padding: 40px var(--container-pad) 32px;
    gap: 28px;
  }

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

  .hero-media img {
    height: 220px;
  }

  /* 首页比较区 */
  .compare-section {
    padding: 40px var(--container-pad) 16px;
  }

  .compare-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .compare-main {
    padding: 20px 16px;
  }

  .compare-row {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 14px 0;
  }

  .compare-sidebar {
    padding: 20px;
  }

  /* 首页服务概览 */
  .services-overview {
    padding: 32px var(--container-pad) 16px;
  }

  .services-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 首页纪事 */
  .projects-featured {
    padding: 32px var(--container-pad) 16px;
  }

  .projects-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .project-media img {
    height: 200px;
  }

  /* 首页指引摘要 */
  .guide-summary {
    padding: 32px var(--container-pad) 16px;
  }

  .process-steps {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 首页文档入口 */
  .materials-entry {
    padding: 32px var(--container-pad) 16px;
  }

  .materials-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 首页行动条 */
  .action-bar {
    padding: 32px var(--container-pad) 40px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .related-links {
    padding: 0 var(--container-pad) 40px;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px var(--container-pad) 16px;
  }

  .footer-brand p {
    max-width: 100%;
  }

  .footer-bottom {
    padding: 16px var(--container-pad) 24px;
  }

  /* 内页布局容器 */
  .page-layout,
  .layout-shell,
  .sidebar-left .page-layout,
  .sidebar-left {
    grid-template-columns: 1fr !important;
    gap: 24px;
    padding-bottom: 40px;
  }

  .conclusion-sidebar,
  .doc-categories {
    position: static;
    order: 2;
  }

  /* 服务页 */
  .anchor-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .service-detail-block,
  .service-detail-block:nth-child(even) {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 32px var(--container-pad);
  }

  .service-detail-block:nth-child(even) .service-detail-media {
    order: 2;
  }

  .service-detail-block:nth-child(even) .service-detail-info {
    order: 1;
  }

  .service-detail-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .service-detail-media img {
    height: 200px;
  }

  .service-collab-note {
    padding: 32px var(--container-pad) 40px;
  }

  /* 纪事页 */
  .record-item {
    grid-template-columns: 1fr;
  }

  .record-media img {
    height: 200px;
    min-height: 0;
  }

  .record-body {
    padding: 20px;
  }

  /* 团队页 */
  .role-matrix-section,
  .collab-mechanism-section {
    padding-bottom: 32px;
  }

  .role-matrix-table-wrap {
    overflow-x: auto;
  }

  .collab-content-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .collab-figure img {
    height: 200px;
  }

  .start-entry-inner {
    padding: 40px var(--container-pad);
  }

  .start-entry-inner .btn {
    display: block;
    width: 100%;
    margin: 8px 0;
  }

  /* 合作指引页 */
  .cooperate-card,
  .cooperate-steps,
  .prepare-materials,
  .template-block,
  .faq-section {
    padding-bottom: 32px;
  }

  .cooperate-card-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .cooperate-steps-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .material-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .template-copy-block {
    padding: 20px;
  }

  .cooperate-note {
    grid-template-columns: 1fr;
    gap: 20px;
    padding-bottom: 40px;
  }

  .cooperate-figure {
    order: 1;
  }

  .cooperate-footnote {
    order: 2;
  }

  .cooperate-figure img {
    height: 200px;
  }

  /* 文档页 */
  .doc-categories {
    order: 1;
  }

  .doc-main {
    order: 2;
  }

  .doc-figure img {
    height: 180px;
  }

  .usage-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .doc-usage {
    padding-bottom: 32px;
  }

  .doc-entry-links {
    padding-bottom: 32px;
  }

  /* 404 */
  .error-main {
    padding: 48px var(--container-pad);
  }

  .error-code {
    font-size: 64px;
  }

  .error-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .error-actions .btn-primary,
  .error-actions .btn-secondary {
    width: 100%;
  }
}

/* --- 小屏：≤390px --- */
@media (max-width: 390px) {
  :root {
    --container-pad: 16px;
  }

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

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

  .anchor-list {
    grid-template-columns: 1fr;
  }

  .compare-main {
    padding: 16px 12px;
  }

  .object-tab {
    padding: 8px 14px;
    font-size: 13px;
  }

  .demand-item {
    padding: 12px;
  }
}