/* ============================================================
   牛马 AI 建站 · zhiheliao.cn 全站样式表
   城市服务风：公共信息感、清楚入口、温和色彩、可靠排版
   ============================================================ */

/* ============================================================
   Base — 基础变量、重置、全局字体与骨架
   ============================================================ */
:root {
  --color-primary: #1B3A5C;
  --color-primary-light: #2A4D73;
  --color-primary-dark: #122A42;
  --color-secondary: #F0F4F8;
  --color-accent: #E67E22;
  --color-accent-hover: #D06E14;
  --color-text: #2C3E50;
  --color-text-light: #5A6B7B;
  --color-text-lighter: #7A8B9B;
  --color-border: #D9E2EC;
  --color-white: #FFFFFF;
  --color-bg: #FFFFFF;
  --color-bg-soft: #F7FAFC;

  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --container-width: 1200px;
  --container-padding: 24px;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --shadow-sm: 0 1px 3px rgba(27, 58, 92, 0.08);
  --shadow-md: 0 4px 12px rgba(27, 58, 92, 0.1);
  --shadow-lg: 0 8px 24px rgba(27, 58, 92, 0.12);

  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;

  --header-height: 72px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 16px;
}

/* 统一容器 */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* ============================================================
   Layout — 全站页头、页脚、主容器、面包屑、页标题
   ============================================================ */

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

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

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
  padding: 8px 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-text-lighter);
  letter-spacing: 0.05em;
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-list li a:hover {
  color: var(--color-primary);
  background-color: var(--color-secondary);
}

.nav-list li a.is-current {
  color: var(--color-primary);
  background-color: var(--color-secondary);
  font-weight: 600;
}

/* 汉堡按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  cursor: pointer;
  color: var(--color-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  min-height: 44px;
}

.nav-toggle-icon {
  width: 18px;
  height: 14px;
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), top var(--transition-base);
}

.nav-toggle-icon::before {
  top: 0;
}

.nav-toggle-icon::after {
  top: 12px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  top: 6px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  top: 6px;
  transform: rotate(-45deg);
}

.nav-toggle-text {
  font-weight: 500;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  font-family: var(--font-sans);
  line-height: 1.4;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 44px;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-light);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background-color: var(--color-border);
  color: var(--color-primary);
}

.header-cta {
  margin-left: 8px;
}

/* ---------- 主容器 ---------- */
.site-main {
  flex: 1;
  width: 100%;
}

/* 内页统一骨架 */
.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-padding) 64px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-lighter);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
  user-select: none;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 32px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 800px;
  line-height: 1.7;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-padding) 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 4px;
}

.footer-brand p:not(.footer-brand-name) {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links {
  display: contents;
}

.footer-group h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-group ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-group ul a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding: 16px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 0;
}

/* ============================================================
   Components — 通用组件
   ============================================================ */

/* ---------- 区块标题 ---------- */
.section-head,
.section-heading {
  margin-bottom: 32px;
}

.section-head h2,
.section-heading h2 {
  font-size: 24px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.section-head p,
.section-heading p {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 720px;
  margin-bottom: 0;
}

.section-foot {
  margin-top: 32px;
  text-align: center;
}

.section-foot a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  padding: 8px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.section-foot a:hover {
  border-color: var(--color-primary);
  background-color: var(--color-secondary);
}

/* ---------- 侧栏 ---------- */
.sidebar {
  min-width: 0;
}

.sidebar-inner {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-inner h2 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-inner ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-inner ul a {
  display: block;
  padding: 10px 12px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.sidebar-inner ul a:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
}

/* ---------- 内容图片 ---------- */
figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

figcaption {
  font-size: 13px;
  color: var(--color-text-lighter);
  text-align: center;
  padding: 8px 0 0;
  line-height: 1.5;
}

/* ---------- 作品卡片 ---------- */
.work-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.work-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.work-card figure {
  margin: 0;
  overflow: hidden;
}

.work-card figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 0;
  transition: transform var(--transition-base);
}

.work-card:hover figure img {
  transform: scale(1.03);
}

.work-info {
  padding: 20px;
}

.work-info h3 {
  font-size: 17px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.work-info p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
  line-height: 1.6;
}

.work-meta {
  font-size: 13px;
  color: var(--color-text-lighter);
  margin-top: 8px;
}

.work-summary {
  font-size: 14px;
  color: var(--color-text-light);
  margin-top: 8px;
  line-height: 1.6;
}

/* ---------- FAQ ---------- */
.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-primary);
  cursor: pointer;
  position: relative;
  list-style: none;
  padding-right: 48px;
  transition: background-color var(--transition-fast);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-text-lighter);
  transition: transform var(--transition-base);
}

.faq-item[open] summary::after {
  content: "−";
  color: var(--color-accent);
}

.faq-item summary:hover {
  background-color: var(--color-bg-soft);
}

.faq-item[open] summary {
  border-bottom: 1px solid var(--color-border);
}

.faq-answer {
  padding: 16px 20px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 12px;
}

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

/* ---------- 相关链接（页脚前） ---------- */
.related-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-padding);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  border-top: 1px solid var(--color-border);
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  flex-shrink: 0;
}

.related-links-item {
  font-size: 14px;
  color: var(--color-text-light);
  padding: 6px 12px;
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.related-links-item:hover {
  background-color: var(--color-secondary);
  color: var(--color-primary);
}

/* ============================================================
   Pages — 首页
   ============================================================ */

/* ---------- 编辑部头条区 ---------- */
.hero-editorial {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-padding) 40px;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
}

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

.hero-card {
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
}

.hero-media {
  margin: 0;
  overflow: hidden;
}

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

.hero-content {
  padding: 28px;
  color: var(--color-white);
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.hero-kicker {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.hero-content h1 {
  font-size: 28px;
  color: var(--color-white);
  margin-bottom: 12px;
  line-height: 1.3;
}

.hero-excerpt {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.7;
  margin-bottom: 24px;
}

.hero-content .btn-outline {
  border-color: var(--color-white);
  color: var(--color-white);
}

.hero-content .btn-outline:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
}

.editorial-side {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

.side-entry {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: box-shadow var(--transition-base), border-color var(--transition-fast);
}

.side-entry:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.side-entry-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.side-entry-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ---------- 服务范围 ---------- */
.services-section {
  background-color: var(--color-bg-soft);
  padding: 56px 0;
}

.services-section .section-head {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.services-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.service-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.service-item h3 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.service-item p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

.service-item .service-solution {
  font-size: 14px;
  color: var(--color-primary);
  font-weight: 500;
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  margin-top: auto;
  line-height: 1.5;
}

/* ---------- 代表作品精选 ---------- */
.works-featured {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px var(--container-padding) 40px;
}

.works-featured .section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ---------- 制作流程 ---------- */
.process-section {
  background-color: var(--color-bg-soft);
  padding: 56px 0;
}

.process-section .section-head {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.process-steps {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step-counter;
  list-style: none;
}

.process-step {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  transition: box-shadow var(--transition-base);
}

.process-step:hover {
  box-shadow: var(--shadow-md);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.process-step h3 {
  font-size: 17px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.process-step p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* ---------- 创作手记摘要 ---------- */
.notes-digest {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px var(--container-padding) 40px;
}

.notes-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.note-entry {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: box-shadow var(--transition-base);
}

.note-entry:hover {
  box-shadow: var(--shadow-md);
}

.note-entry h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

.note-entry h3 a {
  color: var(--color-primary);
}

.note-entry h3 a:hover {
  color: var(--color-accent);
}

.note-entry p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ---------- 合作咨询横幅 ---------- */
.cta-banner {
  background-color: var(--color-primary);
  padding: 56px 0;
}

.cta-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.cta-inner h2 {
  font-size: 24px;
  color: var(--color-white);
  margin-bottom: 4px;
}

.cta-inner p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.7;
  max-width: 640px;
  margin-bottom: 8px;
}

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

.cta-inner .btn-primary:hover {
  background-color: var(--color-secondary);
  color: var(--color-primary);
}

.cta-inner .btn-outline {
  border-color: var(--color-white);
  color: var(--color-white);
}

.cta-inner .btn-outline:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
}

/* ============================================================
   Pages — 内页通用与各页
   ============================================================ */

/* ---------- 布局壳 ---------- */
.layout-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  align-items: start;
}

.layout-shell > .sidebar {
  grid-column: 1;
}

.layout-shell > .works-list,
.layout-shell > .case-detail {
  grid-column: 2;
  min-width: 0;
}

/* 侧栏在前（works / notes） */
.sidebar-left .sidebar {
  grid-column: 1;
}

.sidebar-left .works-list,
.sidebar-left .notes-content {
  grid-column: 2;
  min-width: 0;
}

/* ---------- 作品档案页 ---------- */
.archive-group {
  margin-bottom: 40px;
}

.archive-group h2 {
  font-size: 20px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-secondary);
}

.archive-group .works-grid {
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.archive-group .work-card a {
  display: block;
  color: inherit;
}

.works-more {
  margin-top: 24px;
  padding: 20px;
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-md);
  text-align: center;
}

.works-more p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.works-more p:last-child {
  margin-bottom: 0;
}

.works-more a {
  color: var(--color-primary);
  font-weight: 500;
}

/* ---------- 项目案例页 ---------- */
.case-detail {
  min-width: 0;
}

.case-section {
  margin-bottom: 40px;
}

.case-section h2 {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-secondary);
}

.case-section p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 16px;
}

.case-figure {
  margin: 24px 0;
}

.case-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.related-works {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.related-works-title {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.related-works-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.related-card {
  display: flex;
  gap: 16px;
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  transition: box-shadow var(--transition-base), border-color var(--transition-fast);
}

.related-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.related-card img {
  width: 140px;
  height: 96px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.related-card-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  min-width: 0;
}

.related-card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.4;
}

.related-card-type {
  font-size: 13px;
  color: var(--color-text-lighter);
}

/* ---------- 创作手记页 ---------- */
.page-layout.sidebar-left {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  align-items: start;
}

.page-layout.sidebar-left .sidebar {
  grid-column: 1;
}

.page-layout.sidebar-left .notes-content {
  grid-column: 2;
  min-width: 0;
}

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

.notes-section {
  margin-bottom: 40px;
}

.notes-section h2 {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-secondary);
}

.notes-section p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 16px;
}

.notes-figure {
  margin: 24px 0;
}

.notes-figure img {
  width: 100%;
  aspect-ratio: 16 / 8;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.notes-related {
  margin-top: 40px;
  padding: 24px;
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.notes-related p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.notes-related p:last-child {
  margin-bottom: 0;
}

.notes-related a {
  color: var(--color-primary);
  font-weight: 500;
}

/* ---------- 合作方式页 ---------- */
/* 流程时间线（合作页） */
.process-timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.process-timeline .process-step {
  background-color: var(--color-bg-soft);
}

.process-timeline .process-step h3 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.process-timeline .process-step p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

.content-media-inline {
  margin: 32px 0;
}

.content-media-inline img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius-md);
}

/* 准备信息 */
.preparation-section {
  margin-bottom: 48px;
}

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

.preparation-item {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.preparation-item h3 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.preparation-item p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 阶段交付表 */
.deliverable-section {
  margin-bottom: 48px;
}

.deliverable-table-wrapper {
  overflow-x: auto;
  margin-bottom: 12px;
}

.deliverable-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  min-width: 600px;
}

.deliverable-table th,
.deliverable-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.deliverable-table thead th {
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
  font-size: 14px;
}

.deliverable-table tbody tr:nth-child(even) {
  background-color: var(--color-bg-soft);
}

.deliverable-table tbody tr:hover {
  background-color: var(--color-secondary);
}

.table-note {
  font-size: 13px;
  color: var(--color-text-lighter);
  margin-bottom: 0;
}

/* 咨询入口 */
.consult-entry {
  margin-bottom: 48px;
}

.consult-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.consult-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  transition: box-shadow var(--transition-base);
}

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

.consult-card h3 {
  font-size: 18px;
  color: var(--color-primary);
}

.consult-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.collab-note {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.collab-note p {
  margin-bottom: 8px;
}

.collab-note p:last-child {
  margin-bottom: 0;
}

.collab-note a {
  color: var(--color-primary);
  font-weight: 500;
}

/* ---------- 常见问题页 ---------- */
.faq-intro {
  margin-bottom: 40px;
}

.faq-intro .section-title {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.faq-intro .content-media-inline {
  margin: 20px 0;
}

.faq-intro .content-media-inline img {
  aspect-ratio: 16 / 6;
}

.faq-category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.faq-category-nav a {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.faq-category-nav a:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.faq-list {
  margin-bottom: 48px;
}

.faq-group {
  margin-bottom: 40px;
}

.faq-group-title {
  font-size: 20px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-secondary);
}

/* 更多帮助 */
.more-help {
  margin-bottom: 48px;
}

.more-help .section-title {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.more-help-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.help-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: box-shadow var(--transition-base), border-color var(--transition-fast);
}

.help-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.help-card h3 {
  font-size: 17px;
  color: var(--color-primary);
}

.help-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 8px;
}

.help-card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* ---------- 反馈说明页 ---------- */
.feedback-intro-media {
  margin-bottom: 32px;
}

.feedback-intro-media img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.feedback-cards-section {
  margin-bottom: 48px;
}

.feedback-cards-section > h2 {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 20px;
}

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

.feedback-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: box-shadow var(--transition-base);
}

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

.feedback-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.feedback-card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 18px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.feedback-card-header h3 {
  font-size: 17px;
  color: var(--color-primary);
}

.feedback-card > p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

.feedback-path {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.feedback-path h4,
.feedback-prepare h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.feedback-path p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 8px;
}

.feedback-path p:last-child {
  margin-bottom: 0;
}

.feedback-path a {
  color: var(--color-primary);
  font-weight: 500;
}

.feedback-prepare {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.feedback-prepare ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.feedback-prepare ul li {
  font-size: 14px;
  color: var(--color-text-light);
  padding-left: 16px;
  position: relative;
  line-height: 1.5;
}

.feedback-prepare ul li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--color-accent);
  font-weight: 700;
}

/* 准备清单 */
.prepare-checklist {
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 48px;
}

.prepare-checklist > h2 {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.prepare-checklist > p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.checklist-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.checklist-group h3 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.checklist-group ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.checklist-group ul li {
  font-size: 14px;
  color: var(--color-text);
  padding-left: 18px;
  position: relative;
  line-height: 1.5;
}

.checklist-group ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.checklist-note {
  font-size: 13px;
  color: var(--color-text-lighter);
  margin-top: 24px;
  margin-bottom: 0;
}

/* 响应说明 */
.response-note {
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 40px;
  color: var(--color-white);
}

.response-note h2 {
  font-size: 22px;
  color: var(--color-white);
  margin-bottom: 16px;
}

.response-note p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 16px;
}

.response-note p:last-of-type {
  margin-bottom: 24px;
}

.response-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

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

.response-note .btn-primary:hover {
  background-color: var(--color-secondary);
  color: var(--color-primary);
}

.response-note .btn-secondary {
  background-color: transparent;
  border: 2px solid var(--color-white);
  color: var(--color-white);
}

.response-note .btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
}

/* ============================================================
   Pages — 404
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1;
}

.error-panel {
  text-align: center;
  max-width: 520px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: 24px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  line-height: 1.7;
}

/* ============================================================
   Responsive — 响应式断点
   ============================================================ */

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

  .archive-group .works-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* ---------- 手机（≤768px） ---------- */
@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
    --header-height: 60px;
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 20px;
  }

  /* 页头 */
  .header-inner {
    flex-wrap: wrap;
    padding-top: 8px;
    padding-bottom: 8px;
    gap: 8px;
  }

  .nav-toggle {
    display: inline-flex;
    order: 3;
    margin-left: auto;
  }

  .brand {
    order: 1;
  }

  .header-cta {
    display: none;
  }

  .site-nav {
    order: 4;
    width: 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0;
    padding: 8px 0;
    border-top: 1px solid var(--color-border);
  }

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

  .nav-list li a {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    border-bottom: 1px solid var(--color-bg-soft);
  }

  .nav-list li:last-child a {
    border-bottom: none;
  }

  /* 首页 */
  .hero-editorial {
    grid-template-columns: 1fr;
    padding-top: 24px;
  }

  .editorial-side {
    flex-direction: row;
    gap: 16px;
  }

  .side-entry {
    padding: 20px;
  }

  .side-entry-title {
    font-size: 16px;
  }

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

  .works-grid {
    grid-template-columns: 1fr;
  }

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

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

  .cta-inner {
    align-items: stretch;
  }

  .cta-inner .btn {
    width: 100%;
  }

  /* 内页 */
  .inner-main {
    padding-top: 24px;
    padding-bottom: 48px;
  }

  .page-header {
    margin-bottom: 24px;
    padding-bottom: 16px;
  }

  .page-title {
    font-size: 26px;
  }

  /* 布局壳 */
  .layout-shell {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .layout-shell > .sidebar {
    grid-column: 1;
    grid-row: 1;
  }

  .layout-shell > .works-list,
  .layout-shell > .case-detail {
    grid-column: 1;
    grid-row: 2;
  }

  .sidebar-left .sidebar {
    grid-column: 1;
    grid-row: 2;
  }

  .sidebar-left .works-list,
  .sidebar-left .notes-content {
    grid-column: 1;
    grid-row: 1;
  }

  .sidebar-inner {
    position: static;
  }

  /* 作品页 */
  .archive-group .works-grid {
    grid-template-columns: 1fr;
  }

  /* 案例页 */
  .related-works-grid {
    grid-template-columns: 1fr;
  }

  .related-card img {
    width: 120px;
    height: 84px;
  }

  /* 手记页 */
  .page-layout.sidebar-left {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .page-layout.sidebar-left .sidebar {
    grid-column: 1;
    grid-row: 2;
  }

  .page-layout.sidebar-left .notes-content {
    grid-column: 1;
    grid-row: 1;
  }

  /* 合作页 */
  .process-timeline {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .preparation-grid {
    grid-template-columns: 1fr;
  }

  .consult-cards {
    grid-template-columns: 1fr;
  }

  .deliverable-table-wrapper {
    overflow-x: auto;
  }

  /* FAQ 页 */
  .faq-category-nav {
    flex-direction: column;
    align-items: stretch;
  }

  .faq-category-nav a {
    text-align: center;
  }

  .more-help-cards {
    grid-template-columns: 1fr;
  }

  /* 反馈页 */
  .feedback-cards {
    grid-template-columns: 1fr;
  }

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

  .checklist-grid {
    grid-template-columns: 1fr;
  }

  .prepare-checklist {
    padding: 24px;
  }

  .response-note {
    padding: 28px;
  }

  .response-actions {
    flex-direction: column;
  }

  .response-actions .btn {
    width: 100%;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 40px;
  }

  .footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  /* 相关链接 */
  .related-links {
    padding: 16px;
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- 小屏（≤480px） ---------- */
@media (max-width: 480px) {
  .brand-name {
    font-size: 18px;
  }

  .brand-slogan {
    font-size: 11px;
  }

  .hero-content {
    padding: 20px;
  }

  .hero-content h1 {
    font-size: 24px;
  }

  .service-item {
    padding: 24px 20px;
  }

  .process-step {
    padding: 24px 20px;
  }

  .note-entry {
    padding: 24px 20px;
  }

  .footer-links {
    grid-template-columns: 1fr;
  }

  .related-works-grid {
    grid-template-columns: 1fr;
  }

  .related-card {
    flex-direction: column;
  }

  .related-card img {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
  }

  .consult-card {
    padding: 24px 20px;
  }

  .error-code {
    font-size: 56px;
  }
}

/* ============================================================
   动效增强 — 不影响初始可见性
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
  .work-card,
  .service-item,
  .process-step,
  .note-entry,
  .feedback-card,
  .consult-card,
  .help-card,
  .related-card {
    transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-fast);
  }

  .work-card:hover,
  .service-item:hover,
  .process-step:hover,
  .note-entry:hover,
  .feedback-card:hover,
  .consult-card:hover,
  .help-card:hover,
  .related-card:hover {
    transform: translateY(-4px);
  }
}