/* ==========================================================================
   樱桃影视 · 整站样式表
   版本：1.0
   说明：单色品牌风，黑/白/暖灰 + 琥珀强调色，电影级制作公司气质
   ========================================================================== */

/* ==========================================================================
   Base：变量、重置、字体、通用元素
   ========================================================================== */

:root {
  /* 色彩体系 */
  --color-bg: #F6F6F4;
  --color-ink: #111214;
  --color-ink-soft: #2A2D31;
  --color-accent: #F5B402;
  --color-border: #DFDFDA;
  --color-white: #FFFFFF;
  --color-text: #3A3D42;
  --color-text-light: #6B6F76;
  --color-footer-bg: #1B1D1F;
  --color-footer-text: #C7C9CC;

  /* 字体 */
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Inter", system-ui, -apple-system, sans-serif;

  /* 尺寸 */
  --container-max: 1200px;
  --container-pad: 24px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;

  /* 间距 */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 96px;

  /* 过渡 */
  --transition: 0.25s ease;

  /* 字体尺寸 */
  --fs-h1-mobile: 32px;
  --fs-h1-tablet: 40px;
  --fs-h1-desktop: 48px;
  --fs-body: 16px;
  --fs-body-lg: 18px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition), border-color var(--transition), background-color var(--transition);
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

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

/* 通用标题 */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-ink);
  font-weight: 600;
  line-height: 1.4;
}

/* 视觉隐藏（仅供屏幕阅读） */
.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;
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all var(--transition);
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
}

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

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

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

.btn-outline:hover {
  background-color: var(--color-ink);
  color: var(--color-white);
  border-color: var(--color-ink);
}

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

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-ink);
}

.btn-compact {
  min-height: 40px;
  padding: 8px 20px;
  font-size: 14px;
}

.btn-text {
  padding: 8px 0;
  min-height: auto;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-accent);
  border-radius: 0;
}

.btn-text:hover {
  color: var(--color-accent);
}

/* 通用容器 */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
}

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

/* ==========================================================================
   Layout：页头、页脚、网格系统
   ========================================================================== */

/* ---------- 页头 ---------- */
.site-header {
  background-color: var(--color-ink);
  color: var(--color-white);
  position: relative;
  z-index: 100;
}

.header-shell {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 16px;
}

.site-nav {
  display: block;
}

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

.nav-list a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--color-white);
  opacity: 0.85;
  border-radius: var(--radius-sm);
  transition: opacity var(--transition), color var(--transition);
}

.nav-list a:hover {
  opacity: 1;
  color: var(--color-accent);
}

.nav-list a.is-current {
  opacity: 1;
  color: var(--color-accent);
  font-weight: 500;
}

.brand-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.08em;
  white-space: nowrap;
  transition: color var(--transition);
  flex-shrink: 0;
}

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

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

.header-actions .btn-primary {
  background-color: var(--color-accent);
  color: var(--color-ink);
  border-color: var(--color-accent);
}

.header-actions .btn-primary:hover {
  background-color: var(--color-white);
  border-color: var(--color-white);
  color: var(--color-ink);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-white);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 移动端抽屉 */
.mobile-nav {
  display: none;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  border-top: 4px solid var(--color-accent);
  flex-shrink: 0;
}

.footer-top {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--container-pad) var(--space-lg);
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-xl);
}

.footer-brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.06em;
  margin-bottom: var(--space-xs);
}

.footer-tagline {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-footer-text);
  max-width: 360px;
}

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.04em;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 24px;
}

.footer-links a {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--color-footer-text);
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: var(--space-sm) var(--container-pad);
  text-align: center;
}

.copyright {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  max-width: var(--container-max);
  margin: 0 auto;
}

/* ---------- 通用区块标题 ---------- */
.section-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
  letter-spacing: 0.01em;
}

.align-center {
  text-align: center;
}

.section-padding {
  padding: var(--space-2xl) 0;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-ink);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
  transition: color var(--transition), border-color var(--transition);
}

.text-link:hover {
  color: var(--color-accent);
  border-color: var(--color-ink);
}

/* ==========================================================================
   Components：可复用模块
   ========================================================================== */

/* ---------- 面包屑 ---------- */
.breadcrumb {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 20px var(--container-pad) 0;
  font-size: 14px;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

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

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

/* ---------- 页面标题区 ---------- */
.page-header {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-lg) var(--container-pad) var(--space-md);
}

.page-description {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-xs);
}

.page-title {
  font-size: var(--fs-h1-desktop);
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.3;
  margin-bottom: var(--space-sm);
}

.page-intro {
  font-size: var(--fs-body-lg);
  line-height: 1.8;
  color: var(--color-text);
  max-width: 760px;
}

.page-lead {
  font-size: var(--fs-body-lg);
  line-height: 1.8;
  color: var(--color-text);
  max-width: 760px;
}

.page-tag {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xs);
}

/* ---------- 站点内页通用 ---------- */
.inner-main {
  background-color: var(--color-bg);
}

/* ---------- 相关链接（内页底部） ---------- */
.related-links {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

.related-links-label {
  font-size: 14px;
  color: var(--color-text-light);
  margin-right: var(--space-sm);
}

.related-links-item {
  font-size: 15px;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-accent);
  padding: 4px 0;
  margin-right: var(--space-md);
  transition: color var(--transition);
}

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

/* ---------- 首页场景卡片 ---------- */
.scene-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.scene-card {
  display: block;
  padding: 28px 24px;
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-lg);
  backdrop-filter: none;
  transition: background-color var(--transition), border-color var(--transition), transform var(--transition);
}

.scene-card:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.scene-card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.scene-card-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.75);
}

/* ---------- 首页双轨入口卡 ---------- */
.entry-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.entry-card {
  display: block;
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  border-left: 3px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.entry-card:hover {
  border-left-color: var(--color-accent);
  box-shadow: 0 4px 20px rgba(17, 18, 20, 0.06);
  transform: translateX(4px);
}

.entry-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

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

.entry-more {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
  transition: color var(--transition);
}

.entry-card:hover .entry-more {
  color: var(--color-accent);
}

/* ---------- 图片画廊 ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-ink);
}

.gallery-item img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.gallery-item:hover img {
  transform: scale(1.03);
}

.gallery-item figcaption {
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-white);
  background-color: rgba(17, 18, 20, 0.85);
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  transition: background-color var(--transition);
}

.gallery-item:hover figcaption {
  background-color: var(--color-ink);
}

.gallery-main img {
  height: 360px;
}

/* ---------- 首页流程步骤 ---------- */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-item {
  padding: 24px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  position: relative;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.step-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  right: 20px;
  height: 3px;
  background-color: var(--color-accent);
  border-radius: 0 0 3px 3px;
  opacity: 0.6;
  transition: opacity var(--transition);
}

.step-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 6px 24px rgba(17, 18, 20, 0.08);
}

.step-item:hover::before {
  opacity: 1;
}

.step-item h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-ink);
}

.step-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 12px;
}

.step-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
  transition: color var(--transition);
}

.step-link:hover {
  color: var(--color-accent);
}

/* ---------- 通用 section 描述 ---------- */
.section-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  max-width: 680px;
  margin-bottom: var(--space-md);
}

/* ==========================================================================
   Pages：首页
   ========================================================================== */

/* ---------- 首屏场景选择 ---------- */
.hero-scene {
  position: relative;
  background-color: var(--color-ink);
  color: var(--color-white);
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.45;
}

.hero-overlay {
  position: relative;
  z-index: 1;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 120px var(--container-pad) 96px;
}

.hero-headline {
  font-size: 44px;
  font-weight: 600;
  color: var(--color-white);
  line-height: 1.3;
  margin-bottom: 16px;
  max-width: 640px;
  letter-spacing: 0.02em;
}

.hero-positioning {
  font-size: 18px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
  max-width: 560px;
  margin-bottom: var(--space-xl);
}

/* ---------- 双轨品牌区 ---------- */
.dual-track {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.track-left p {
  font-size: 16px;
  line-height: 1.9;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.track-left .text-link {
  margin-top: var(--space-sm);
}

.track-right {
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-xl);
}

/* ---------- 质感样片画廊 ---------- */
.gallery-section {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.gallery-section .gallery-grid {
  max-width: var(--container-max);
  margin: 0 auto;
}

/* ---------- 制作流程速览 ---------- */
.process-teaser {
  max-width: var(--container-max);
  margin: 0 auto;
}

/* ---------- 合作与指南入口 ---------- */
.cta-zone {
  background-color: var(--color-ink);
  color: var(--color-white);
}

.cta-content {
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: center;
}

.cta-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.cta-content p {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
  max-width: 560px;
  margin: 0 auto var(--space-lg);
}

.cta-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.cta-links .btn-primary {
  background-color: var(--color-accent);
  color: var(--color-ink);
  border-color: var(--color-accent);
}

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

.cta-links .btn-outline {
  border-color: rgba(255, 255, 255, 0.6);
  color: var(--color-white);
}

.cta-links .btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: transparent;
}

/* ==========================================================================
   Pages：内页通用模块
   ========================================================================== */

/* ---------- 影像方案 fangan ---------- */
.content-layout {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad) var(--space-2xl);
}

.module-block {
  margin-bottom: var(--space-2xl);
}

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

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

.overview-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(17, 18, 20, 0.06);
}

.overview-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.overview-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 12px;
}

.anchor-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
  transition: color var(--transition), border-color var(--transition);
}

.anchor-link:hover {
  color: var(--color-ink);
  border-color: var(--color-ink);
}

/* 服务详解 */
.service-details {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-xl);
}

.service-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.service-item:last-child {
  border-bottom: none;
}

.service-text h3 {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
}

.service-subhead {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  margin-top: var(--space-sm);
  margin-bottom: 4px;
}

.service-text p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.service-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-ink);
}

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

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

/* 服务对比 */
.service-compare {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-xl);
}

.compare-tip {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.compare-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: var(--space-sm);
}

.compare-option {
  padding: 10px 20px;
  font-size: 15px;
  color: var(--color-ink);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  min-height: 44px;
  transition: all var(--transition);
}

.compare-option:hover {
  border-color: var(--color-accent);
}

.compare-option.is-selected {
  background-color: var(--color-ink);
  color: var(--color-white);
  border-color: var(--color-ink);
}

.compare-hint {
  font-size: 14px;
  color: var(--color-accent);
  min-height: 24px;
  margin-bottom: var(--space-sm);
}

.compare-table-wrap {
  overflow-x: auto;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.compare-table {
  min-width: 640px;
}

.compare-table th,
.compare-table td {
  padding: 14px 20px;
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid var(--color-border);
}

.compare-table th {
  background-color: var(--color-ink);
  color: var(--color-white);
  font-weight: 500;
  white-space: nowrap;
}

.compare-table td {
  color: var(--color-text);
  vertical-align: top;
}

.compare-table tr:last-child td {
  border-bottom: none;
}

.compare-conclusion {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-ink);
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-white);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.next-step {
  margin-top: var(--space-sm);
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  flex-wrap: wrap;
}

.next-step a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

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

/* 相关推荐 */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-card {
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.related-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(17, 18, 20, 0.06);
}

.related-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.related-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 12px;
}

.related-card a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.related-card a:hover {
  color: var(--color-ink);
  border-color: var(--color-ink);
}

/* ---------- 项目档案 xiangmu ---------- */
.archive-intro {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-lg) var(--container-pad) var(--space-xl);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.archive-intro-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-ink);
}

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

.media-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-light);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-top: none;
}

.archive-intro-content h2 {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
}

.archive-intro-content p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

/* 项目类型索引 */
.project-type-index,
.project-timeline,
.deliverables-section {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--container-pad);
}

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

.project-type-card {
  padding: 24px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  border-top: 3px solid var(--color-accent);
  transition: box-shadow var(--transition), transform var(--transition);
}

.project-type-card:hover {
  box-shadow: 0 6px 20px rgba(17, 18, 20, 0.08);
  transform: translateY(-4px);
}

.project-type-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.project-type-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 12px;
}

.project-type-card a {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.project-type-card a:hover {
  color: var(--color-ink);
  border-color: var(--color-ink);
}

/* 时间轴 */
.project-timeline {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.timeline-list {
  position: relative;
  padding-left: 32px;
}

.timeline-list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-lg);
}

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

.timeline-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 2px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-marker {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.timeline-step {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.06em;
}

.timeline-marker h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
}

.timeline-detail p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 8px;
}

.timeline-role,
.timeline-output {
  display: block;
}

.timeline-role strong,
.timeline-output strong {
  color: var(--color-ink);
  font-weight: 600;
  margin-right: 8px;
}

/* 交付物 */
.deliverables-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

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

.deliverable-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(17, 18, 20, 0.06);
}

.deliverable-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.deliverable-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 12px;
}

.deliverable-card a {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.deliverable-card a:hover {
  color: var(--color-ink);
  border-color: var(--color-ink);
}

/* 相关链接 */
.related-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--container-pad);
}

.related-link-item {
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition);
}

.related-link-item:hover {
  border-color: var(--color-accent);
}

.related-link-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.related-link-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 12px;
}

.related-link-item a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.related-link-item a:hover {
  color: var(--color-ink);
  border-color: var(--color-ink);
}

/* ---------- 制作流程 liucheng ---------- */
.process-intro {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-lg) var(--container-pad) var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.intro-copy {
  flex: 1;
  min-width: 280px;
}

.intro-copy p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.intro-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

/* 流程索引 */
.process-index {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad) var(--space-lg);
}

.process-index-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
}

.process-index-list li {
  flex-shrink: 0;
}

.process-index-list a {
  display: block;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  white-space: nowrap;
  transition: all var(--transition);
}

.process-index-list a:hover {
  border-color: var(--color-accent);
  color: var(--color-ink);
}

/* 流程详情 */
.process-detail {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad) var(--space-2xl);
}

.process-step {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: var(--space-md);
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
}

.process-step:last-child {
  border-bottom: none;
}

.step-number {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  padding-top: 4px;
}

.step-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.step-summary {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  max-width: 720px;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: var(--space-md);
}

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

.step-col h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.step-col p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

.step-media {
  margin-top: var(--space-md);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-ink);
}

.step-media img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

/* 下一步衔接 */
.process-next {
  background-color: var(--color-ink);
  color: var(--color-white);
}

.next-content {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-2xl) var(--container-pad);
  text-align: center;
}

.next-content .section-title {
  color: var(--color-white);
}

.next-content p {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
  max-width: 560px;
  margin: 0 auto var(--space-lg);
}

.next-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.next-actions .btn-primary {
  background-color: var(--color-accent);
  color: var(--color-ink);
  border-color: var(--color-accent);
}

.next-actions .btn-primary:hover {
  background-color: var(--color-white);
  border-color: var(--color-white);
}

.next-actions .btn-outline {
  border-color: rgba(255, 255, 255, 0.6);
  color: var(--color-white);
}

.next-actions .btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: transparent;
}

/* liucheng 页底部相关链接 */
.related-links {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-md) var(--container-pad) var(--space-xl);
  text-align: center;
  border-top: none;
  background-color: transparent;
}

/* ---------- 创作指南 zhidao ---------- */
.guide-intro {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-lg) var(--container-pad) var(--space-md);
}

.intro-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: var(--space-md) 0;
}

.tag-item {
  display: inline-block;
  padding: 6px 16px;
  font-size: 14px;
  color: var(--color-ink);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.content-media-inline {
  margin: var(--space-md) 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-ink);
}

.content-media-inline img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.content-media-inline figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-light);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-top: none;
}

/* 选题起点 */
.topic-origin,
.method-cards,
.checklist-section {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--container-pad);
}

.section-heading {
  margin-bottom: var(--space-md);
}

.section-heading p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  max-width: 680px;
}

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

.origin-card {
  padding: 24px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  border-top: 3px solid var(--color-accent);
  transition: box-shadow var(--transition), transform var(--transition);
}

.origin-card:hover {
  box-shadow: 0 6px 20px rgba(17, 18, 20, 0.08);
  transform: translateY(-4px);
}

.origin-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.origin-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 8px;
}

.card-question {
  font-size: 13px;
  color: var(--color-accent);
  border-top: 1px solid var(--color-border);
  padding-top: 8px;
}

/* 方法卡片 */
.method-cards {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

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

.method-card {
  padding: 24px 20px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition);
}

.method-card:nth-child(4),
.method-card:nth-child(5) {
  grid-column: span 1;
}

.method-card:hover {
  border-color: var(--color-accent);
}

.method-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

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

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

.checklist-block {
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.checklist-block h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

.check-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 8px;
}

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

.checklist-note {
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background-color: var(--color-white);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.checklist-note p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  flex: 1;
  min-width: 240px;
}

/* 指南页相关推荐 */
.related-entry {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.related-entry h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 4px;
}

.related-entry p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 8px;
}

.related-entry a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.related-entry a:hover {
  color: var(--color-ink);
  border-color: var(--color-ink);
}

/* ---------- 常见问答 wenda ---------- */
.inner-content-shell {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad) var(--space-2xl);
}

.wenda-intro-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
  margin-bottom: var(--space-xl);
}

.intro-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-ink);
}

.intro-media img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.intro-copy .section-title {
  margin-bottom: var(--space-sm);
}

.intro-copy p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
}

/* FAQ 组 */
.faq-group {
  margin-bottom: var(--space-xl);
}

.faq-group-head {
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-ink);
}

.faq-group-head .section-title {
  margin-bottom: 4px;
}

.faq-group-head p {
  font-size: 15px;
  color: var(--color-text);
}

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

.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item:hover {
  border-color: var(--color-accent);
}

.faq-item summary {
  padding: 16px 24px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  min-height: 52px;
  transition: color var(--transition);
}

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

.faq-item summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 300;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition);
}

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

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 16px 24px 20px;
}

.faq-answer p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
}

/* 出口区 */
.wenda-exit-block {
  margin-top: var(--space-2xl);
  padding: var(--space-xl);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
}

.exit-intro .section-title {
  margin-bottom: var(--space-sm);
}

.exit-intro p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  max-width: 560px;
  margin: 0 auto var(--space-md);
}

.exit-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- 商务合作 hezuo ---------- */
.cooperation-intro {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-lg) var(--container-pad) var(--space-xl);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.intro-text-wrap .section-title {
  margin-bottom: var(--space-sm);
}

.intro-text-wrap p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.intro-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-ink);
}

.intro-media img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.intro-media figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-light);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-top: none;
}

/* 合作步骤 */
.cooperation-steps-section,
.preparation-section,
.principles-section,
.next-step-section {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--container-pad);
}

.section-intro {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  max-width: 680px;
  margin-bottom: var(--space-md);
}

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

.step-card {
  padding: 24px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  position: relative;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.step-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(17, 18, 20, 0.06);
}

.step-number {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  display: block;
}

.step-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.step-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 8px;
}

.step-role {
  font-size: 13px;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  padding-top: 8px;
}

/* 双列准备区 */
.preparation-section {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.preparation-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.prep-col {
  padding: var(--space-md);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.prep-col h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.col-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.prep-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 8px;
}

.prep-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.prep-list strong {
  color: var(--color-ink);
  font-weight: 600;
  margin-right: 6px;
}

/* 原则区 */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.principle-item {
  padding: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: border-color var(--transition);
}

.principle-item:hover {
  border-color: var(--color-accent);
}

.principle-index {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-accent);
  flex-shrink: 0;
  padding-top: 2px;
}

.principle-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

/* 衔接卡片 */
.next-step-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.next-card {
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.next-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(17, 18, 20, 0.06);
}

.next-card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.next-card-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 12px;
}

/* ==========================================================================
   Pages：404
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--container-pad);
  background-color: var(--color-bg);
  flex: 1;
}

.error-panel {
  max-width: 640px;
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  border-top: 4px solid var(--color-accent);
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1;
  margin-bottom: var(--space-sm);
  letter-spacing: 0.02em;
}

.error-heading {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
}

.error-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.error-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

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

/* 平板 768–1023px */
@media (max-width: 1023px) {
  .header-shell {
    height: 64px;
  }

  .desktop-nav {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .mobile-nav {
    display: block;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-ink);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .mobile-nav .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px 16px;
  }

  .mobile-nav .nav-list li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

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

  .mobile-nav .nav-list a {
    padding: 14px 8px;
    font-size: 16px;
  }

  .mobile-nav.is-open {
    max-height: 480px;
  }

  .header-actions .btn-compact {
    display: none;
  }

  /* 首页 */
  .hero-overlay {
    padding: 96px var(--container-pad) 64px;
  }

  .hero-headline {
    font-size: 36px;
  }

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

  .dual-track {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .track-right {
    border-left: none;
    padding-left: 0;
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-lg);
  }

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

  .gallery-main img {
    height: 300px;
  }

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

  /* 影像方案 */
  .overview-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .service-item {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .service-media img {
    height: 260px;
  }

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

  .related-grid .related-card:last-child {
    grid-column: span 2;
  }

  /* 项目档案 */
  .archive-intro {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

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

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

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

  /* 制作流程 */
  .process-intro {
    flex-direction: column;
    align-items: flex-start;
  }

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

  /* 创作指南 */
  .origin-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  /* 商务合作 */
  .cooperation-intro {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

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

  .preparation-two-col {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

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

  /* 问答 */
  .wenda-intro-block {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* 手机 ≤767px */
@media (max-width: 767px) {
  :root {
    --fs-h1-desktop: 32px;
    --space-2xl: 56px;
    --space-xl: 40px;
  }

  .header-shell {
    height: 60px;
    padding: 0 16px;
  }

  .brand-logo {
    font-size: 18px;
  }

  .mobile-nav {
    top: 60px;
  }

  /* 首页 */
  .hero-overlay {
    padding: 72px 20px 48px;
  }

  .hero-headline {
    font-size: 28px;
    line-height: 1.4;
  }

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

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

  .scene-card {
    padding: 20px;
  }

  .dual-track {
    padding: var(--space-xl) 20px;
  }

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

  .gallery-section {
    padding: var(--space-xl) 20px;
  }

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

  .gallery-item img,
  .gallery-main img {
    height: 240px;
  }

  .process-teaser {
    padding: var(--space-xl) 20px;
  }

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

  .cta-zone {
    padding: var(--space-xl) 20px;
  }

  .cta-links {
    flex-direction: column;
    align-items: stretch;
  }

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

  /* 页脚 */
  .footer-top {
    padding: var(--space-lg) 20px;
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
    gap: 6px 16px;
  }

  .footer-bottom {
    padding: 12px 20px;
  }

  /* 内页通用 */
  .breadcrumb {
    padding: 16px 20px 0;
    font-size: 13px;
  }

  .page-header {
    padding: var(--space-md) 20px var(--space-sm);
  }

  .page-title {
    font-size: 32px;
  }

  .page-intro,
  .page-lead {
    font-size: 16px;
  }

  .content-layout,
  .inner-content-shell {
    padding: 0 20px var(--space-xl);
  }

  .module-block {
    margin-bottom: var(--space-xl);
  }

  /* 影像方案 */
  .overview-grid {
    grid-template-columns: 1fr;
  }

  .service-item {
    grid-template-columns: 1fr;
  }

  .service-text h3 {
    font-size: 20px;
  }

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

  .compare-selector {
    flex-direction: column;
    align-items: stretch;
  }

  .compare-option {
    width: 100%;
    text-align: center;
  }

  .compare-table-wrap {
    border-radius: var(--radius-sm);
  }

  .compare-table th,
  .compare-table td {
    padding: 10px 12px;
    font-size: 13px;
  }

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

  .related-grid .related-card:last-child {
    grid-column: auto;
  }

  /* 项目档案 */
  .archive-intro {
    padding: var(--space-md) 20px var(--space-lg);
  }

  .archive-intro-content h2 {
    font-size: 20px;
  }

  .archive-intro-media img,
  .media-figure img {
    height: 220px;
  }

  .project-type-index,
  .project-timeline,
  .deliverables-section {
    padding: var(--space-lg) 20px;
  }

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

  .timeline-list {
    padding-left: 24px;
  }

  .timeline-item::before {
    left: -22px;
  }

  .timeline-marker {
    flex-direction: column;
    gap: 4px;
  }

  .timeline-marker h3 {
    font-size: 18px;
  }

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

  .related-links-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: var(--space-lg) 20px;
  }

  /* 制作流程 */
  .process-intro {
    padding: var(--space-md) 20px 0;
  }

  .process-index {
    padding: 0 20px var(--space-md);
  }

  .process-index-list {
    gap: 6px;
  }

  .process-index-list a {
    padding: 8px 16px;
    font-size: 14px;
  }

  .process-detail {
    padding: 0 20px var(--space-xl);
  }

  .process-step {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: var(--space-md) 0;
  }

  .step-number {
    font-size: 13px;
  }

  .step-title {
    font-size: 20px;
  }

  .step-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

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

  .next-content {
    padding: var(--space-xl) 20px;
  }

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

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

  /* 创作指南 */
  .guide-intro {
    padding: var(--space-md) 20px;
  }

  .topic-origin,
  .method-cards,
  .checklist-section {
    padding: var(--space-lg) 20px;
  }

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

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

  .content-media-inline img {
    height: 200px;
  }

  .checklist-note {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-sm) var(--space-md);
  }

  .checklist-note .btn {
    width: 100%;
  }

  /* 问答 */
  .wenda-intro-block {
    margin-bottom: var(--space-lg);
  }

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

  .faq-group {
    margin-bottom: var(--space-lg);
  }

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

  .faq-answer {
    padding: 12px 16px 16px;
  }

  .wenda-exit-block {
    margin-top: var(--space-lg);
    padding: var(--space-lg) 20px;
  }

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

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

  /* 商务合作 */
  .cooperation-intro {
    padding: var(--space-md) 20px var(--space-lg);
  }

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

  .cooperation-steps-section,
  .preparation-section,
  .principles-section,
  .next-step-section {
    padding: var(--space-lg) 20px;
  }

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

  .preparation-two-col {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .prep-col {
    padding: var(--space-sm);
  }

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

  .next-step-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 404 */
  .error-panel {
    padding: var(--space-lg) 20px;
  }

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

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

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

/* 桌面 ≥1024px 导航微调 */
@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }

  .mobile-nav {
    display: none;
  }
}

/* 中屏（992-1199）微调 */
@media (min-width: 1024px) and (max-width: 1199px) {
  .nav-list a {
    padding: 8px 12px;
    font-size: 14px;
  }

  .header-shell {
    gap: 12px;
  }
}

/* 确保触屏目标 ≥44px */
@media (max-width: 767px) {
  .btn,
  .nav-toggle,
  .nav-list a,
  .faq-item summary,
  .compare-option,
  .process-index-list a {
    min-height: 44px;
  }

  .footer-links a {
    padding: 8px 0;
    min-height: 40px;
  }
}