/* ==========================================================================
   51吃瓜网站在线观看 — 全站样式表
   复古计算机风 × 现代企业可信度
   ========================================================================== */

/* ==========================================================================
   Base — 变量、重置、全局基础
   ========================================================================== */

:root {
  --color-text: #0f172a;
  --color-primary: #1d4ed8;
  --color-accent: #ea580c;
  --color-bg: #f1f5f9;
  --color-card: #ffffff;
  --color-border: #cbd5e1;
  --color-muted: #64748b;
  --color-dark: #0f172a;

  --font-sans: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --container-width: 1200px;
  --content-max: 720px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;

  --header-height: 68px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  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: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style-position: inside;
}

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

h1 {
  font-size: 32px;
  line-height: 1.3;
}

h2 {
  font-size: 24px;
  line-height: 1.4;
}

h3 {
  font-size: 18px;
  line-height: 1.5;
}

h4 {
  font-size: 16px;
  line-height: 1.5;
}

p {
  margin-bottom: 0.75rem;
}

/* 等宽字体工具类 */
.mono-label,
.mono-tag,
.phase-tag,
.step-number,
.error-number,
.meta-item,
time,
.related-links-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--color-muted);
}

/* 像素点阵分隔线 */
.pixel-divider {
  height: 4px;
  background-image: radial-gradient(circle, var(--color-border) 1px, transparent 1px);
  background-size: 8px 4px;
  background-repeat: repeat-x;
  border: none;
}

/* ==========================================================================
   Layout — 全局布局骨架
   ========================================================================== */

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

.header-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

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

.brand-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.brand-name::before {
  content: "▚ ";
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-item {
  display: inline-block;
  padding: 0.5rem 0.75rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color 0.2s ease, background-color 0.2s ease;
  white-space: nowrap;
}

.nav-item:hover {
  color: var(--color-primary);
  background-color: rgba(29, 78, 216, 0.06);
}

.nav-item.is-current {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-item.is-current::after {
  content: "";
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.125rem;
  height: 2px;
  background-color: var(--color-primary);
}

.site-main {
  min-height: 60vh;
}

.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.375rem;
  padding: 1.25rem 0 0.75rem;
  font-size: 0.875rem;
  color: var(--color-muted);
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
  font-family: var(--font-mono);
}

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

/* 页面标题区 */
.page-header {
  padding: 1rem 0 0.5rem;
}

.page-title {
  font-size: 32px;
  line-height: 1.3;
  font-weight: 700;
}

.page-title-area {
  padding: 0.5rem 0 1.5rem;
}

.page-intro {
  font-size: 1.0625rem;
  color: var(--color-muted);
  max-width: var(--content-max);
  margin-bottom: 1rem;
}

.page-title-shell {
  max-width: var(--content-max);
}

/* 通用区块标题 */
.section-title {
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 48px;
  height: 3px;
  background-color: var(--color-accent);
}

/* 页脚 */
.site-footer {
  background-color: var(--color-dark);
  color: #cbd5e1;
  margin-top: 2rem;
}

.footer-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 3rem 1.25rem 1.5rem;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 2.5rem;
}

.footer-brand p {
  color: #94a3b8;
  font-size: 0.9375rem;
  margin-bottom: 0.5rem;
}

.footer-brand strong {
  color: #f1f5f9;
  font-size: 1.125rem;
  display: block;
  margin-bottom: 0.5rem;
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.link-group h3 {
  color: #f1f5f9;
  font-size: 0.9375rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.link-group a {
  display: block;
  color: #94a3b8;
  font-size: 0.875rem;
  padding: 0.25rem 0;
  transition: color 0.2s ease;
}

.link-group a:hover {
  color: #ffffff;
}

.footer-contact h3 {
  color: #f1f5f9;
  font-size: 0.9375rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.footer-contact p {
  color: #94a3b8;
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}

.footer-contact a {
  color: var(--color-accent);
  font-size: 0.875rem;
  display: inline-block;
  border: 1px solid rgba(234, 88, 12, 0.4);
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.footer-contact a:hover {
  background-color: var(--color-accent);
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  padding: 1rem 1.25rem;
  text-align: center;
}

.footer-bottom p {
  color: #64748b;
  font-size: 0.8125rem;
  margin: 0;
}

/* 通用布局壳 */
.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

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

/* 按钮 */
.primary-cta,
.btn-primary,
.button-link {
  display: inline-block;
  background-color: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-primary);
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  cursor: pointer;
}

.primary-cta:hover,
.btn-primary:hover,
.button-link:hover {
  background-color: #1e40af;
  border-color: #1e40af;
  color: #ffffff;
  transform: translateY(-1px);
}

.secondary-cta,
.btn-secondary {
  display: inline-block;
  background-color: transparent;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-primary);
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
  cursor: pointer;
}

.secondary-cta:hover,
.btn-secondary:hover {
  background-color: rgba(29, 78, 216, 0.08);
  color: var(--color-primary);
  transform: translateY(-1px);
}

/* 文字链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-weight: 600;
  font-size: 0.9375rem;
}

.text-link::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform 0.2s ease;
}

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

/* 图片容器 */
figure {
  margin: 0;
}

figure img {
  width: 100%;
  object-fit: cover;
}

figcaption {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-muted);
  padding: 0.5rem 0;
}

/* FAQ details 手风琴 */
details.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-card);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

details.faq-item summary {
  padding: 1rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 2.5rem;
  transition: background-color 0.2s ease;
}

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

details.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--color-primary);
  transition: transform 0.2s ease;
}

details.faq-item[open] summary {
  background-color: rgba(29, 78, 216, 0.04);
}

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

details.faq-item p {
  padding: 0 1.25rem 1rem;
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

/* 列表样式 */
.guide-list,
.checklist {
  padding-left: 1.25rem;
  margin-bottom: 1rem;
}

.guide-list li,
.checklist li {
  margin-bottom: 0.5rem;
  padding-left: 0.25rem;
}

/* 相关链接条 */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-border);
  margin-top: 2rem;
}

.related-links-label {
  font-weight: 600;
  color: var(--color-text);
}

.related-links-item {
  font-size: 0.875rem;
  padding: 0.25rem 0.75rem;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

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

/* 首屏 */
.hero-intro {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding: 3rem 0 2.5rem;
}

.hero-copy h1 {
  margin-bottom: 1rem;
}

.hero-lead {
  font-size: 1.125rem;
  color: var(--color-muted);
  margin-bottom: 1.5rem;
  max-width: 480px;
}

.hero-copy .primary-cta,
.hero-copy .secondary-cta {
  margin-right: 0.75rem;
  margin-bottom: 0.75rem;
}

.hero-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background-color: var(--color-card);
}

.hero-visual img {
  aspect-ratio: 4 / 3;
  width: 100%;
}

.hero-visual figcaption {
  padding: 0.75rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* 问题与服务范围 */
.problem-scope {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  gap: 2.5rem;
  padding: 2.5rem 0;
}

.problem-scope .pixel-divider {
  align-self: stretch;
  height: auto;
  width: 1px;
  background-image: radial-gradient(circle, var(--color-border) 1px, transparent 1px);
  background-size: 4px 8px;
  background-repeat: repeat-y;
}

.problem-list ul,
.scope-list ul {
  list-style: none;
  margin-bottom: 1rem;
}

.problem-list li,
.scope-list li {
  padding: 0.625rem 0;
  border-bottom: 1px solid rgba(203, 213, 225, 0.5);
  font-size: 0.9375rem;
  position: relative;
  padding-left: 1.25rem;
}

.problem-list li::before {
  content: "?";
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-weight: 700;
}

.scope-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  color: var(--color-primary);
}

/* 流程预览 */
.workflow-preview {
  padding: 2.5rem 0;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.step-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.step-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.step-item .step-number {
  display: block;
  font-size: 0.75rem;
  margin-bottom: 0.5rem;
  color: var(--color-accent);
  font-weight: 600;
}

.step-item h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.step-item p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

/* 主推荐服务 */
.primary-services {
  padding: 2.5rem 0;
}

.primary-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 1.5rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.primary-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.service-figure {
  overflow: hidden;
}

.service-figure img {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.service-info {
  padding: 1.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.service-info h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.service-info p {
  color: var(--color-muted);
  font-size: 0.9375rem;
  margin-bottom: 1rem;
}

/* 次推荐服务 */
.secondary-services {
  padding: 2.5rem 0;
}

.secondary-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 1.25rem;
  align-items: center;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 1rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.secondary-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.secondary-item img {
  width: 160px;
  height: 100px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.item-content h3 {
  font-size: 1.0625rem;
  margin-bottom: 0.375rem;
}

.item-content p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 0.5rem;
}

.item-content .text-link {
  font-size: 0.875rem;
}

/* 最新动态 */
.latest-updates {
  padding: 2.5rem 0;
}

.update-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.update-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.update-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.update-item h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.update-item h3 a {
  color: var(--color-text);
}

.update-item h3 a:hover {
  color: var(--color-primary);
}

.update-item p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.update-item time {
  font-size: 0.75rem;
}

/* 专题入口 */
.topic-gateways {
  padding: 2.5rem 0;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.topic-card {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.25rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.topic-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.topic-card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.topic-card p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

/* 合作咨询条 */
.contact-cta {
  background-color: var(--color-dark);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
  margin: 2.5rem 0 1rem;
}

.contact-cta .section-title {
  color: #f1f5f9;
}

.contact-cta .section-title::after {
  left: 50%;
  transform: translateX(-50%);
}

.contact-cta p {
  color: #94a3b8;
  max-width: 600px;
  margin: 0 auto 1.5rem;
}

.contact-cta .primary-cta {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

.contact-cta .primary-cta:hover {
  background-color: #c2410c;
  border-color: #c2410c;
}

.contact-cta .mono-label {
  display: block;
  margin-top: 1rem;
  color: #64748b;
}

/* ==========================================================================
   Pages — 服务项目 (services)
   ========================================================================== */

.task-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1rem 0 1.5rem;
}

.task-filter a {
  display: inline-block;
  padding: 0.375rem 1rem;
  font-size: 0.875rem;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.task-filter a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.service-groups {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.service-group {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.group-heading {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.group-heading .mono-tag {
  background-color: rgba(29, 78, 216, 0.08);
  color: var(--color-primary);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.group-heading h2 {
  font-size: 1.25rem;
  margin: 0;
}

.service-entry {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
  padding: 1.5rem;
}

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

.entry-media img {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.entry-info h3 {
  font-size: 1rem;
  margin-bottom: 0.375rem;
  color: var(--color-primary);
}

.entry-info p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  margin-bottom: 0.875rem;
}

.entry-info .text-link {
  font-size: 0.875rem;
}

.cooperation-note {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.cooperation-note p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

/* ==========================================================================
   Pages — 制作流程 (process)
   ========================================================================== */

.content-media-inline {
  margin: 1.5rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.content-media-inline img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.content-media-inline figcaption {
  padding: 0.75rem 1rem;
  background-color: var(--color-card);
}

.process-overview {
  padding: 1.5rem 0;
}

.overview-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.75rem;
}

.overview-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
  transition: border-color 0.2s ease;
}

.overview-item:hover {
  border-color: var(--color-primary);
}

.overview-item .phase-tag {
  display: block;
  font-size: 0.75rem;
  margin-bottom: 0.375rem;
  color: var(--color-accent);
  font-weight: 600;
}

.overview-item h3 {
  font-size: 0.9375rem;
  margin-bottom: 0.25rem;
}

.overview-item p {
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.5;
}

.phase-timeline {
  padding: 2rem 0;
}

.phase-block {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
  position: relative;
}

.phase-block::before {
  content: "";
  position: absolute;
  left: 110px;
  top: 0;
  bottom: -2rem;
  width: 2px;
  background-color: var(--color-border);
}

.phase-block:last-child::before {
  display: none;
}

.phase-meta {
  padding-top: 0.5rem;
  position: relative;
  z-index: 1;
}

.phase-meta .phase-tag {
  display: inline-block;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.phase-meta h3 {
  font-size: 1.125rem;
  margin-bottom: 0.375rem;
}

.phase-duration {
  font-size: 0.8125rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
}

.phase-content {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.phase-content h4 {
  font-size: 0.875rem;
  color: var(--color-primary);
  margin-bottom: 0.375rem;
  font-family: var(--font-mono);
  font-weight: 600;
}

.phase-content p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

.phase-owner {
  grid-column: 1 / -1;
  border-top: 1px dashed var(--color-border);
  padding-top: 0.75rem;
}

.delivery-standards {
  padding: 2rem 0;
}

.standards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.standard-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: border-color 0.2s ease;
}

.standard-card:hover {
  border-color: var(--color-primary);
}

.standard-card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  position: relative;
  padding-left: 1rem;
}

.standard-card h3::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.standard-card p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

.process-contact-note {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-top: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.process-contact-note p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

.contact-links {
  display: flex;
  gap: 0.75rem;
}

.contact-links a {
  font-size: 0.875rem;
  font-weight: 600;
}

/* ==========================================================================
   Pages — 常见问题 (faq)
   ========================================================================== */

.faq-groups {
  padding: 1rem 0;
}

.faq-groups-shell {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.faq-groups-shell .mono-label {
  font-weight: 600;
  color: var(--color-text);
}

.faq-tab-list {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.faq-tab {
  display: inline-block;
  padding: 0.375rem 1rem;
  font-size: 0.875rem;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.faq-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.faq-list {
  padding: 1.5rem 0;
}

.faq-list-shell {
  max-width: var(--content-max);
}

.faq-phase {
  margin-bottom: 2rem;
}

.faq-phase h2 {
  font-size: 0.875rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
  padding-bottom: 0.375rem;
  border-bottom: 2px solid rgba(29, 78, 216, 0.15);
  display: inline-block;
}

.faq-gallery {
  padding: 1rem 0;
}

.faq-gallery-shell {
  max-width: var(--content-max);
}

.faq-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

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

.faq-figure figcaption {
  padding: 0.75rem 1rem;
  background-color: var(--color-card);
}

.contact-note {
  padding: 1.5rem 0;
}

.contact-note-shell {
  max-width: var(--content-max);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.contact-note-shell h2 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.contact-note-shell p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  margin-bottom: 1rem;
}

.contact-note-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.note-link {
  font-size: 0.875rem;
  font-weight: 600;
}

/* ==========================================================================
   Pages — 入门指南 (guide)
   ========================================================================== */

.page-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 2.5rem;
  align-items: start;
  padding: 1.5rem 0;
}

.article-header {
  margin-bottom: 2rem;
}

.article-cover {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  margin-bottom: 1.25rem;
}

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

.article-summary {
  font-size: 1.0625rem;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.article-meta {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.meta-item {
  font-size: 0.8125rem;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.meta-item::before {
  content: "▪";
  color: var(--color-accent);
}

.article-body {
  max-width: var(--content-max);
}

.guide-section {
  margin-bottom: 2.5rem;
}

.guide-section h2 {
  font-size: 1.375rem;
  margin-bottom: 0.75rem;
  position: relative;
  padding-left: 1rem;
}

.guide-section h2::before {
  content: "//";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 1rem;
  top: 0.25rem;
}

.guide-section p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.guide-section .guide-list li {
  font-size: 0.9375rem;
  color: var(--color-text);
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.aside-series-nav {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  position: sticky;
  top: calc(var(--header-height) + 1rem);
}

.aside-series-nav h2 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.aside-series-nav ul {
  list-style: none;
}

.aside-series-nav li {
  margin-bottom: 0.375rem;
}

.aside-series-nav a {
  display: block;
  font-size: 0.875rem;
  padding: 0.375rem 0;
  color: var(--color-text);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.aside-series-nav a:hover {
  color: var(--color-primary);
  padding-left: 0.375rem;
}

.next-steps {
  grid-column: 1 / -1;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.next-steps p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

/* ==========================================================================
   Pages — 常见错误 (errors)
   ========================================================================== */

.compare-image {
  padding: 1.5rem 0;
}

.compare-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.compare-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.compare-figure figcaption {
  padding: 0.75rem 1rem;
  background-color: var(--color-card);
}

.errors-list {
  padding: 1.5rem 0;
}

.error-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 1.25rem;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1rem;
  transition: border-color 0.2s ease;
}

.error-item:hover {
  border-color: var(--color-primary);
}

.error-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: rgba(234, 88, 12, 0.08);
  color: var(--color-accent);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1.125rem;
}

.error-name {
  font-size: 1.0625rem;
  margin-bottom: 0.5rem;
}

.error-content p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 0.375rem;
  line-height: 1.6;
}

.error-content p strong {
  color: var(--color-text);
  font-weight: 600;
  margin-right: 0.375rem;
}

.prevention-checklist {
  padding: 1.5rem 0;
}

.prevention-checklist .checklist {
  max-width: var(--content-max);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.5rem 1.5rem 2.5rem;
}

.checklist-item {
  font-size: 0.9375rem;
  margin-bottom: 0.5rem;
  position: relative;
  padding-left: 1.5rem;
}

.checklist-item::before {
  content: "☐";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.next-links {
  padding: 1rem 0;
}

.next-link-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.next-link-list a {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.next-link-list a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ==========================================================================
   Pages — 进阶技巧 (trends)
   ========================================================================== */

.page-trends .page-layout {
  grid-template-columns: 1fr 280px;
}

.article-hero {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  margin-bottom: 2rem;
}

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

.skill-section {
  margin-bottom: 2.5rem;
}

.section-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.section-head .mono-tag {
  background-color: rgba(29, 78, 216, 0.08);
  color: var(--color-primary);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.75rem;
}

.section-head h2 {
  font-size: 1.25rem;
  margin: 0;
}

.skill-section p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.tip-block {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1rem;
}

.tip-block h3 {
  font-size: 0.9375rem;
  margin-bottom: 0.5rem;
}

.tip-block ul {
  padding-left: 1.25rem;
}

.tip-block li {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 0.375rem;
  line-height: 1.6;
}

.version-table {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 1rem;
}

.version-table h3 {
  padding: 1rem 1.25rem;
  font-size: 0.9375rem;
  border-bottom: 1px solid var(--color-border);
  background-color: rgba(241, 245, 249, 0.6);
}

.table-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid rgba(203, 213, 225, 0.4);
}

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

.table-row span {
  font-size: 0.875rem;
  line-height: 1.5;
}

.table-head span {
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-primary);
}

.series-nav {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  position: sticky;
  top: calc(var(--header-height) + 1rem);
}

.series-nav h2 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.series-nav a {
  display: block;
  font-size: 0.875rem;
  padding: 0.375rem 0;
  color: var(--color-text);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.series-nav a:hover {
  color: var(--color-primary);
  padding-left: 0.375rem;
}

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

.next-steps .btn-primary:hover {
  background-color: #c2410c;
  border-color: #c2410c;
}

/* ==========================================================================
   Pages — 合作咨询 (contact)
   ========================================================================== */

.page-contact .lead {
  font-size: 1.0625rem;
  color: var(--color-muted);
  max-width: var(--content-max);
}

.prepare-list {
  padding: 1.5rem 0;
}

.section-header {
  margin-bottom: 1.5rem;
}

.section-header h2 {
  font-size: 1.375rem;
  margin-bottom: 0.375rem;
}

.section-header p {
  font-size: 0.9375rem;
  color: var(--color-muted);
}

.prepare-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.prepare-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: border-color 0.2s ease;
}

.prepare-item:hover {
  border-color: var(--color-primary);
}

.prepare-item h3 {
  font-size: 0.9375rem;
  margin-bottom: 0.5rem;
  position: relative;
  padding-left: 1.25rem;
}

.prepare-item h3::before {
  content: "0" counter(item);
  counter-increment: item;
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.prepare-item p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

.prepare-grid {
  counter-reset: item;
}

.cooperation-flow {
  padding: 1.5rem 0;
}

.flow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.flow-step {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  position: relative;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.flow-step:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(29, 78, 216, 0.08);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.step-content h3 {
  font-size: 0.9375rem;
  margin-bottom: 0.375rem;
}

.step-content p {
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

.contact-visual {
  padding: 1.5rem 0;
}

.contact-visual figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.contact-visual img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.contact-visual figcaption {
  padding: 0.75rem 1rem;
  background-color: var(--color-card);
}

.faq-link {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 1rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.faq-link h2 {
  font-size: 1.125rem;
  margin-bottom: 0.375rem;
}

.faq-link p {
  font-size: 0.9375rem;
  color: var(--color-muted);
  margin: 0;
}

.faq-link a {
  font-weight: 600;
  font-size: 0.9375rem;
  white-space: nowrap;
}

/* ==========================================================================
   Pages — 404
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 65vh;
  padding: 3rem 1.25rem;
}

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

.error-code {
  font-family: var(--font-mono);
  font-size: 5rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 1rem;
}

.error-shell h1 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.error-shell > p {
  color: var(--color-muted);
  margin-bottom: 1.5rem;
}

.error-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.error-help {
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* ==========================================================================
   Responsive — 响应式
   ========================================================================== */

/* 桌面中等宽度 */
@media (max-width: 1024px) {
  .process-steps {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

  .overview-strip {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

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

  .page-layout {
    grid-template-columns: 1fr 240px;
    gap: 1.5rem;
  }
}

/* 平板 */
@media (max-width: 900px) {
  .hero-intro {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 2rem 0;
  }

  .hero-visual {
    max-width: 640px;
  }

  .problem-scope {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .problem-scope .pixel-divider {
    display: none;
  }

  .primary-card {
    grid-template-columns: 1fr;
  }

  .service-figure img {
    aspect-ratio: 16 / 9;
  }

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

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

  .entry-media img {
    aspect-ratio: 16 / 9;
  }

  .phase-block {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .phase-block::before {
    display: none;
  }

  .phase-content {
    grid-template-columns: 1fr;
  }

  .phase-owner {
    grid-column: auto;
  }

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

  .footer-shell {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .aside-series-nav,
  .series-nav {
    position: static;
  }

  .next-steps {
    grid-column: auto;
  }

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

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

  .header-shell {
    padding: 0 1rem;
  }

  .brand-name {
    font-size: 1rem;
  }

  .main-nav {
    gap: 0;
  }

  .nav-item {
    padding: 0.375rem 0.5rem;
    font-size: 0.875rem;
  }

  .home-main,
  .inner-main {
    padding: 0 1rem 2rem;
  }

  .hero-intro {
    padding: 1.5rem 0;
  }

  .hero-copy h1 {
    font-size: 1.5rem;
  }

  .hero-lead {
    font-size: 1rem;
  }

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

  .step-item:nth-child(5) {
    grid-column: 1 / -1;
  }

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

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

  .secondary-item img {
    width: 100%;
    height: 160px;
  }

  .overview-strip {
    grid-template-columns: 1fr 1fr;
  }

  .overview-item:nth-child(5) {
    grid-column: 1 / -1;
  }

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

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

  .table-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
    padding: 0.5rem 1rem;
  }

  .table-head {
    display: none;
  }

  .table-row span::before {
    content: attr(data-label);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-primary);
    display: block;
    font-weight: 600;
  }

  .contact-cta {
    padding: 2rem 1rem;
  }

  .contact-cta .section-title {
    font-size: 1.25rem;
  }

  .faq-groups-shell {
    flex-direction: column;
    align-items: flex-start;
  }

  .error-item {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .error-number {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .page-intro {
    font-size: 1rem;
  }

  .article-meta {
    gap: 0.75rem;
  }

  .footer-shell {
    padding: 2rem 1rem 1rem;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .contact-note-links {
    flex-direction: column;
    gap: 0.5rem;
  }

  .cooperation-note {
    flex-direction: column;
    align-items: flex-start;
  }

  .process-contact-note {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-links {
    flex-wrap: wrap;
  }
}

/* 小手机 */
@media (max-width: 480px) {
  .nav-item {
    padding: 0.375rem 0.375rem;
    font-size: 0.8125rem;
  }

  .brand-name {
    font-size: 0.9375rem;
  }

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

  .step-item:nth-child(5) {
    grid-column: auto;
  }

  .overview-strip {
    grid-template-columns: 1fr;
  }

  .overview-item:nth-child(5) {
    grid-column: auto;
  }

  .primary-cta,
  .secondary-cta,
  .btn-primary,
  .btn-secondary {
    display: block;
    width: 100%;
    text-align: center;
    margin-right: 0;
    margin-bottom: 0.5rem;
  }

  .hero-copy .primary-cta,
  .hero-copy .secondary-cta {
    margin-right: 0;
  }
}