/* ============================================================
   糖心小视频 · 全站样式表
   版本：1.0
   说明：物流运营风配视频制作，深蓝/墨色为主，橙黄强调
   结构：base / layout / components / pages / responsive
   ============================================================ */

/* ============================================================
   base — 基础变量、重置、字体、通用元素
   ============================================================ */
:root {
  --color-primary: #0F2A3D;
  --color-primary-light: #1C3D55;
  --color-accent: #F5A623;
  --color-accent-dark: #D98E17;
  --color-bg: #F7F9FA;
  --color-text: #2B3A46;
  --color-border: #E2E8ED;
  --color-danger: #E5484D;
  --color-white: #FFFFFF;
  --color-text-light: #5A6B78;

  --font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;

  --container-width: 1200px;
  --container-padding: 20px;

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

  --shadow-sm: 0 1px 3px rgba(15, 42, 61, 0.08);
  --shadow-md: 0 4px 14px rgba(15, 42, 61, 0.1);
  --shadow-lg: 0 8px 28px rgba(15, 42, 61, 0.14);

  --transition-base: 0.2s ease;
}

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

html {
  font-size: 16px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

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

/* ============================================================
   layout — 全站骨架：页头、页脚、主容器、面包屑
   ============================================================ */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  background-color: var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(15, 42, 61, 0.18);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  color: var(--color-white);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.2;
  flex-shrink: 0;
}

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

.brand-name {
  letter-spacing: 0.02em;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-list li {
  position: relative;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.nav-list a:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-list a.is-current {
  color: var(--color-white);
  background-color: rgba(245, 166, 35, 0.2);
  font-weight: 600;
}

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

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

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding) 64px;
  width: 100%;
}

/* 面包屑 */
.breadcrumb {
  padding: 18px 0 4px;
  font-size: 13px;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

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

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

.breadcrumb-sep {
  margin: 0 8px;
  color: #9AA8B4;
}

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

/* 页面标题区 */
.page-header {
  padding: 28px 0 32px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 40px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 760px;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.78);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 52px var(--container-padding) 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.footer-col h3 {
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 14px;
}

.footer-col p {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
}

.footer-col a {
  display: block;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  padding: 4px 0;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 18px var(--container-padding);
  text-align: center;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
}

.footer-bottom p {
  max-width: var(--container-width);
  margin: 0 auto;
}

/* ============================================================
   components — 通用组件：按钮、链接、卡片、表格、FAQ、时间线
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), box-shadow var(--transition-base);
  min-height: 44px;
}

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

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(245, 166, 35, 0.3);
}

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

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

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent-dark);
  padding: 6px 0;
}

.text-link:hover {
  color: var(--color-primary);
}

.section-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-desc,
.section-intro {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 720px;
}

/* 相关页面导航（内页底部） */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--color-border);
  margin-top: 40px;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-light);
  margin-right: 8px;
}

.related-links-item,
.related-links a {
  font-size: 14px;
  color: var(--color-primary);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 6px 16px;
  transition: border-color var(--transition-base), background-color var(--transition-base);
}

.related-links-item:hover,
.related-links a:hover {
  border-color: var(--color-accent);
  background-color: #FFF8EB;
}

/* 通用 related section */
.related-section {
  padding: 40px 0 0;
}

.related-title {
  font-size: 20px;
  margin-bottom: 20px;
}

.related-hint {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

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

.related-link {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.related-link:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

/* ============================================================
   pages — 首页
   ============================================================ */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding) 64px;
}

/* hero 首屏 */
.hero {
  padding: 48px 0 56px;
}

.hero-layout {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 48px;
  align-items: center;
}

.hero-menu {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 440px;
}

.service-menu {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  margin-bottom: 28px;
}

.service-item {
  display: flex;
  flex-direction: column;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.service-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.service-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.service-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

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

.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background-color: var(--color-primary);
}

.hero-figure img {
  width: 100%;
  height: 380px;
  object-fit: cover;
}

.hero-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  background-color: var(--color-primary);
}

.status-tip {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: #FFF8EB;
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text);
  line-height: 1.6;
}

/* 作品类型速览 */
.works-preview {
  padding: 40px 0;
}

.section-heading {
  margin-bottom: 28px;
}

.section-heading h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

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

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

.preview-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.preview-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.preview-card h3 {
  font-size: 16px;
  font-weight: 600;
  padding: 14px 16px 4px;
  color: var(--color-primary);
}

.preview-card p {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 0 16px 16px;
  line-height: 1.6;
}

/* 制作路线 */
.process {
  padding: 40px 0;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin: 16px 0;
}

.process .section-heading {
  padding: 0 32px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  padding: 0 32px 24px;
}

.process-step {
  position: relative;
  padding: 24px 20px 0;
  border-top: 3px solid var(--color-border);
}

.process-step::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 20px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 2px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.step-node {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}

.process-step h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.process-step p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.65;
  margin-bottom: 6px;
}

.process-step strong {
  color: var(--color-primary);
  font-weight: 600;
}

/* 服务与场景双栏 */
.safe-scope {
  padding: 40px 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.safe-scope-col {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
}

.safe-scope-col h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.safe-scope-col > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 18px;
}

.scope-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.scope-list li {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.65;
  padding-left: 18px;
  position: relative;
}

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.scope-list strong {
  color: var(--color-primary);
  font-weight: 600;
}

/* 团队与幕后入口 */
.team-behind {
  padding: 24px 0 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.entry-card {
  background-color: var(--color-primary);
  border-radius: var(--radius-md);
  padding: 32px;
  color: var(--color-white);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.entry-card h2 {
  color: var(--color-white);
  font-size: 22px;
  margin-bottom: 10px;
}

.entry-card p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 20px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 600;
  padding: 6px 0;
}

.card-link:hover {
  color: var(--color-white);
}

/* FAQ 摘要 */
.faq-preview {
  padding: 16px 0 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px 24px;
}

.faq-item h2 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.faq-item p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.65;
}

.faq-preview .text-link {
  grid-column: 1 / -1;
  justify-self: start;
}

/* CTA 横幅 */
.cta {
  padding: 20px 0 0;
}

.cta-banner {
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner h2 {
  color: var(--color-white);
  font-size: 28px;
  margin-bottom: 12px;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 15px;
  max-width: 560px;
  margin: 0 auto 28px;
  line-height: 1.7;
}

/* ============================================================
   pages — 作品案例 works
   ============================================================ */
.tag-guide {
  margin-bottom: 48px;
}

.tag-guide > h2,
.sample-grid > h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 24px;
}

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

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

.tag-guide-item h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.tag-guide-item p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.65;
}

.tag-guide-item p + p {
  margin-top: 8px;
}

.sample-grid {
  margin-bottom: 40px;
}

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

.sample-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.sample-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.sample-card figcaption {
  padding: 16px;
}

.sample-type {
  display: inline-block;
  background-color: #FFF3DC;
  color: var(--color-accent-dark);
  font-size: 12px;
  font-weight: 600;
  border-radius: 999px;
  padding: 2px 12px;
  margin-bottom: 8px;
}

.sample-card figcaption p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.related {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.related > h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.related-list a {
  display: flex;
  flex-direction: column;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.related-list a:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.related-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.related-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ============================================================
   pages — 服务项目 services
   ============================================================ */
.service-list {
  margin-bottom: 56px;
}

.service-item {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 32px;
  align-items: center;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 24px;
}

.service-info h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

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

.service-info h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin: 14px 0 8px;
}

.service-info ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.service-info ul li {
  font-size: 13px;
  color: var(--color-text);
  line-height: 1.6;
  padding-left: 16px;
  position: relative;
}

.service-info ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

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

.service-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.service-media figcaption {
  padding: 8px 12px;
  font-size: 12px;
  color: var(--color-text-light);
  background-color: var(--color-bg);
  text-align: center;
}

.service-compare {
  margin-bottom: 40px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  overflow-x: auto;
}

.service-compare table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.service-compare th {
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
  text-align: left;
  padding: 14px 16px;
  white-space: nowrap;
}

.service-compare td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  line-height: 1.6;
  vertical-align: top;
}

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

.service-compare tr:nth-child(even) td {
  background-color: #FBFCFD;
}

/* ============================================================
   pages — 制作团队 team
   ============================================================ */
.roles-section,
.collaboration-section,
.work-scene-section {
  margin-bottom: 48px;
}

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

.role-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.role-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

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

.role-collab {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.65;
  padding: 10px 12px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
}

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

.collab-step {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
}

.collab-step h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.collab-step h3::before {
  content: counter(step);
  counter-increment: step;
  display: inline-block;
  width: 26px;
  height: 26px;
  line-height: 26px;
  text-align: center;
  background-color: var(--color-accent);
  color: var(--color-primary);
  border-radius: 50%;
  font-size: 13px;
  margin-right: 8px;
}

.collab-steps {
  counter-reset: step;
}

.step-owner {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent-dark);
  margin-bottom: 8px;
}

.step-output {
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 8px;
}

.step-detail {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.65;
}

.scene-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-primary);
}

.scene-figure img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}

.scene-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  background-color: var(--color-primary);
}

/* ============================================================
   pages — 幕后记录 behind
   ============================================================ */
.behind-hero {
  margin-bottom: 48px;
}

.behind-hero-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-primary);
}

.behind-hero-figure img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.behind-hero-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  background-color: var(--color-primary);
}

.method-section,
.progress-section {
  margin-bottom: 56px;
}

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

.method-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: box-shadow var(--transition-base);
}

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

.method-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

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

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

.method-list li {
  font-size: 13px;
  color: var(--color-text);
  line-height: 1.6;
  padding-left: 18px;
  position: relative;
}

.method-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

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

.progress-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background-color: var(--color-border);
}

.progress-item {
  position: relative;
  margin-bottom: 28px;
}

.progress-marker {
  position: absolute;
  left: -32px;
  top: 4px;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.progress-node {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-accent);
}

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

.progress-content h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.progress-content p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.65;
}

.progress-output {
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 500;
}

/* ============================================================
   pages — 问题反馈 faq
   ============================================================ */
.faq-groups {
  margin-bottom: 56px;
}

.faq-groups > h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 24px;
}

.content-media-inline {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 32px;
  background-color: var(--color-primary);
}

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

.content-media-inline figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  background-color: var(--color-primary);
}

.faq-group {
  margin-bottom: 36px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  align-items: start;
}

.faq-group-head h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.faq-group-head p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.65;
}

.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;
}

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

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.faq-item[open] summary {
  background-color: #FFF8EB;
}

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

.faq-item summary:hover {
  background-color: #FFFDF6;
}

.faq-answer {
  padding: 0 20px 18px;
  border-top: 1px solid var(--color-border);
}

.faq-answer p {
  padding-top: 14px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* 反馈流程 */
.feedback-flow {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 40px;
}

.feedback-flow > h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.feedback-flow > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

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

.flow-step {
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 20px;
  border-left: 3px solid var(--color-accent);
}

.flow-step h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.flow-step p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.65;
}

/* ============================================================
   pages — 合作指南 cooperation
   ============================================================ */
.route-section {
  margin-bottom: 56px;
}

.route-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

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

.route-node:hover {
  box-shadow: var(--shadow-md);
}

.route-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  right: 20px;
  height: 3px;
  background-color: var(--color-accent);
  border-radius: 0 0 3px 3px;
}

.route-node-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 14px;
}

.route-node-detail {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.route-node-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-accent-dark);
  text-transform: none;
  margin-top: 6px;
}

.route-node-detail p:not(.route-node-label) {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.guide-section {
  margin-bottom: 48px;
}

.guide-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.guide-col {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
}

.guide-col-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.guide-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.guide-list li {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.65;
  padding-left: 18px;
  position: relative;
}

.guide-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.guide-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-primary);
}

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

.guide-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  background-color: var(--color-primary);
}

.related-section .related-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.related-section .related-list a {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.related-section .related-list a:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

/* ============================================================
   pages — 404
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 40px 20px;
}

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

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

.error-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 28px;
}

.error-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  background-color: var(--color-accent);
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  min-height: 44px;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.error-btn:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
}

/* ============================================================
   responsive — 1024px / 768px / 390px 断点
   ============================================================ */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-title {
    font-size: 30px;
  }

  .hero-figure img {
    height: 320px;
  }

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

  .process-steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .process-step {
    border-top: 3px solid var(--color-border);
  }

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

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

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

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

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

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

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

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

  .service-item {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .service-media img {
    height: 240px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 60px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    box-shadow: 0 8px 16px rgba(15, 42, 61, 0.2);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 20px;
    gap: 2px;
    max-height: calc(100vh - 60px);
    overflow-y: auto;
  }

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

  .nav-list a {
    padding: 12px 16px;
    font-size: 15px;
  }

  .inner-main {
    padding: 0 16px 48px;
  }

  .page-header {
    padding: 20px 0 24px;
    margin-bottom: 32px;
  }

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

  .hero {
    padding: 32px 0 40px;
  }

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

  .hero-figure img {
    height: 240px;
  }

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

  .btn {
    width: 100%;
  }

  .preview-grid,
  .sample-grid-list,
  .tag-guide-list,
  .roles-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .preview-card img,
  .sample-card img {
    height: 130px;
  }

  .process-steps {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 0 20px 20px;
  }

  .process-step {
    border-top: none;
    border-left: 3px solid var(--color-border);
    padding: 12px 16px;
  }

  .process-step::before {
    top: 16px;
    left: -7px;
  }

  .safe-scope,
  .team-behind,
  .faq-preview {
    grid-template-columns: 1fr;
  }

  .safe-scope-col {
    padding: 24px;
  }

  .cta-banner {
    padding: 36px 24px;
  }

  .cta-banner h2 {
    font-size: 24px;
  }

  .service-item {
    padding: 24px;
  }

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

  .service-compare {
    padding: 16px;
  }

  .collab-steps {
    grid-template-columns: 1fr;
  }

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

  .behind-hero-figure img {
    height: 260px;
  }

  .scene-figure img {
    height: 260px;
  }

  .route-steps {
    grid-template-columns: 1fr;
  }

  .route-node {
    padding: 20px;
  }

  .guide-layout {
    grid-template-columns: 1fr;
  }

  .guide-figure img {
    height: 220px;
  }

  .flow-steps {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 16px 24px;
  }

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

  .related-links {
    flex-direction: column;
    align-items: flex-start;
  }

  .related-links-item,
  .related-links a {
    width: 100%;
    text-align: center;
  }
}

@media (max-width: 390px) {
  .preview-grid,
  .sample-grid-list,
  .tag-guide-list,
  .roles-grid {
    grid-template-columns: 1fr;
  }

  .preview-card img,
  .sample-card img {
    height: 180px;
  }

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

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

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

  .section-title {
    font-size: 22px;
  }

  .footer-col {
    text-align: left;
  }
}