/* ==========================================================================
   17吃瓜网 · 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base
   -------------------------------------------------------------------------- */

:root {
  --c-primary: #1F4468;
  --c-primary-dark: #17334f;
  --c-accent: #2E7D6E;
  --c-accent-soft: #e4efeb;
  --c-warn: #B06A1F;
  --c-warn-soft: #f6ecdd;
  --c-page: #F4F6F4;
  --c-surface: #FFFFFF;
  --c-text: #26313A;
  --c-muted: #5A6672;
  --c-line: #DCE2DE;
  --c-line-strong: #c6cfc9;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-card: 0 1px 2px rgba(31, 68, 104, 0.06);
  --shadow-raise: 0 2px 8px rgba(31, 68, 104, 0.10);
  --wrap: 1160px;
  --col-main: 720px;
  --col-side: 200px;
  --gap-col: 40px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--c-page);
  color: var(--c-text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--c-primary);
  font-weight: 600;
  line-height: 1.4;
}

p {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

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

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

figure {
  margin: 0;
}

figcaption {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 13px;
  line-height: 1.7;
}

button {
  font-family: inherit;
}

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   layout · 全站骨架
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--c-primary);
  border-bottom: 3px solid var(--c-primary-dark);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  min-height: 44px;
  padding-right: 8px;
  color: #ffffff;
  font-size: 1.25rem;
  font-weight: 700;
}

.brand:hover {
  color: #d8e6e1;
}

.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

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

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  color: #dbe4ea;
  font-size: 15px;
  border-bottom: 3px solid transparent;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.nav-link:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.10);
}

.nav-link.is-current {
  color: #ffffff;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.12);
  border-bottom-color: #7fc3b1;
}

.nav-toggle {
  display: none;
  flex: 0 0 auto;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  background: rgba(255, 255, 255, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: #ffffff;
  border-radius: 2px;
}

.mobile-nav {
  display: none;
  background: var(--c-primary-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  padding: 6px 16px 12px;
}

.mobile-nav-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 8px;
  color: #e2ebf0;
  font-size: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.mobile-nav-list a:hover,
.mobile-nav-list a.is-current {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
}

.site-main {
  display: block;
  width: 100%;
}

.inner-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px 56px;
}

/* --------------------------------------------------------------------------
   components · 通用按钮 / 面包屑 / 标题区 / 折叠项
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
}

.btn-primary {
  background: var(--c-primary);
  color: #ffffff;
  border-color: var(--c-primary);
}

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

.btn-ghost {
  background: #ffffff;
  color: var(--c-primary);
  border-color: var(--c-line-strong);
}

.btn-ghost:hover {
  color: var(--c-accent);
  border-color: var(--c-accent);
  background: var(--c-accent-soft);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 22px 0 0;
  color: var(--c-muted);
  font-size: 14px;
}

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

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

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

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

.page-header {
  padding: 16px 0 20px;
  border-bottom: 1px solid var(--c-line);
}

.page-title {
  color: var(--c-primary);
  font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.2rem);
  font-weight: 600;
  line-height: 1.35;
}

.page-title-block {
  padding: 18px 0 26px;
}

.page-lead,
.page-lede,
.page-description {
  color: var(--c-muted);
  font-size: 15px;
  line-height: 1.75;
}

.page-head {
  padding: 14px 0 6px;
}

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

.faq-item {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.faq-question,
.faq-q,
.faq-item > summary {
  position: relative;
  display: block;
  padding: 14px 44px 14px 16px;
  color: var(--c-primary);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after,
.faq-q::after,
.faq-item > summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 16px;
  transform: translateY(-50%);
  color: var(--c-accent);
  font-size: 20px;
  font-weight: 600;
  line-height: 1;
}

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

.faq-answer,
.faq-a {
  padding: 0 16px 16px;
  color: var(--c-muted);
  font-size: 15px;
  line-height: 1.75;
}

.faq-answer p + p,
.faq-a + .faq-a {
  margin-top: 10px;
}

.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  max-width: var(--wrap);
  margin: 32px auto 0;
  padding: 16px 18px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.related-links-label {
  color: var(--c-muted);
  font-size: 14px;
}

.related-links-item {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 14px;
  background: var(--c-accent-soft);
  border-radius: 999px;
  color: var(--c-accent);
  font-size: 14px;
}

.related-links-item:hover {
  background: var(--c-accent);
  color: #ffffff;
}

/* --------------------------------------------------------------------------
   components · 页脚
   -------------------------------------------------------------------------- */

.site-footer {
  margin-top: 56px;
  background: #ffffff;
  border-top: 3px solid var(--c-primary);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(240px, 1.1fr) minmax(320px, 1.6fr) minmax(240px, 1.1fr);
  gap: 40px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 40px 24px 32px;
}

.footer-col {
  min-width: 0;
}

.footer-brand {
  color: var(--c-primary);
  font-size: 1.15rem;
  font-weight: 700;
}

.footer-slogan {
  margin-top: 6px;
  color: var(--c-accent);
  font-size: 14px;
}

.footer-desc {
  margin-top: 12px;
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.75;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.footer-nav-title {
  margin-bottom: 10px;
  color: var(--c-primary);
  font-size: 15px;
  font-weight: 600;
}

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

.footer-nav-list a {
  display: inline-block;
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.6;
}

.footer-nav-list a:hover {
  color: var(--c-accent);
}

.footer-boundary p {
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.75;
}

.footer-bottom {
  border-top: 1px solid var(--c-line);
}

.footer-copy {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 16px 24px;
  color: var(--c-muted);
  font-size: 13px;
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */

.home-main {
  display: block;
}

.section-hero,
.section-zone,
.section-tasks,
.section-flow,
.section-faq {
  padding: 48px 0;
}

.section-notice,
.section-rules,
.section-boundary {
  padding: 40px 0;
}

.hero-inner,
.section-head,
.zone-grid,
.task-groups,
.flow-track,
.flow-media,
.rules-inner,
.faq-list,
.boundary-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 520px);
  align-items: start;
  gap: 48px;
}

.hero-text {
  min-width: 0;
}

.hero-eyebrow {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 12px;
  background: var(--c-accent-soft);
  border-radius: 999px;
  color: var(--c-accent);
  font-size: 13px;
  font-weight: 500;
}

.hero-text h1 {
  font-size: clamp(1.75rem, 1.3rem + 1.7vw, 2.4rem);
  line-height: 1.35;
}

.hero-lead {
  margin-top: 16px;
  color: var(--c-muted);
  font-size: 16px;
}

.hero-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.hero-step {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.hero-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #ffffff;
  font-size: 12px;
  font-weight: 600;
}

.hero-step-text {
  font-size: 14px;
  color: var(--c-text);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.hero-media {
  min-width: 0;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: var(--shadow-card);
}

.hero-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

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

.section-head h2 {
  font-size: 1.35rem;
}

.section-sub {
  margin-top: 10px;
  color: var(--c-muted);
  font-size: 15px;
  max-width: 780px;
}

.zone-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.zone-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 22px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.zone-card:hover {
  border-color: var(--c-accent);
  border-left-color: var(--c-accent);
  box-shadow: var(--shadow-raise);
}

.zone-name {
  font-size: 1.1rem;
}

.zone-desc {
  margin-top: 10px;
  color: var(--c-muted);
  font-size: 15px;
}

.zone-link {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  min-height: 34px;
  margin-top: 16px;
  padding: 0 12px;
  background: var(--c-accent-soft);
  border-radius: var(--radius-sm);
  color: var(--c-accent);
  font-size: 14px;
  font-weight: 500;
}

.zone-link:hover {
  background: var(--c-accent);
  color: #ffffff;
}

.task-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.task-group {
  min-width: 0;
  padding: 22px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.task-group-title {
  font-size: 1.1rem;
}

.task-group-desc {
  margin-top: 10px;
  color: var(--c-muted);
  font-size: 15px;
}

.task-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
  border-top: 1px solid var(--c-line);
  padding-top: 14px;
}

.task-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  background: #f7f9f8;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--c-text);
  font-size: 15px;
}

.task-list a:hover {
  background: var(--c-accent-soft);
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.notice-bar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px 24px;
  background: var(--c-warn-soft);
  border: 1px solid #e6d3b6;
  border-left: 4px solid var(--c-warn);
  border-radius: var(--radius);
}

.notice-tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: var(--c-warn);
  border-radius: 999px;
  color: #ffffff;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
}

.notice-title {
  font-size: 1rem;
  color: #7a4a12;
}

.notice-text {
  margin-top: 4px;
  color: #6b5330;
  font-size: 14px;
}

.notice-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 16px;
  background: #ffffff;
  border: 1px solid #e0c9a5;
  border-radius: var(--radius-sm);
  color: var(--c-warn);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}

.notice-link:hover {
  background: var(--c-warn);
  border-color: var(--c-warn);
  color: #ffffff;
}

.flow-track {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.flow-step {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-primary);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.flow-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
}

.flow-name {
  margin-top: 12px;
  font-size: 1.05rem;
}

.flow-desc {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.7;
}

.flow-media {
  margin-top: 24px;
}

.flow-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.rules-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 40px;
  align-items: start;
}

.rules-intro {
  min-width: 0;
}

.rules-intro h2 {
  font-size: 1.35rem;
}

.rules-intro p {
  margin-top: 14px;
  color: var(--c-muted);
  font-size: 15px;
}

.rules-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
  counter-reset: rule;
}

.rule-item {
  position: relative;
  padding: 14px 16px 14px 52px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  font-size: 15px;
  counter-increment: rule;
}

.rule-item::before {
  content: counter(rule);
  position: absolute;
  top: 14px;
  left: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--c-accent-soft);
  border-radius: 50%;
  color: var(--c-accent);
  font-size: 13px;
  font-weight: 600;
}

.boundary-inner {
  padding: 28px 24px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.boundary-inner h2 {
  font-size: 1.35rem;
}

.boundary-lead {
  margin-top: 12px;
  color: var(--c-muted);
  font-size: 15px;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.boundary-item {
  padding: 14px 16px;
  background: #f7f9f8;
  border-left: 3px solid var(--c-line-strong);
  border-radius: var(--radius-sm);
  font-size: 15px;
}

.boundary-note {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--c-line);
  color: var(--c-muted);
  font-size: 14px;
}

.boundary-note a {
  color: var(--c-accent);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   pages · 内页通用两栏
   -------------------------------------------------------------------------- */

.page-layout {
  display: grid;
  grid-template-columns: minmax(520px, var(--col-main)) var(--col-side);
  justify-content: space-between;
  gap: var(--gap-col);
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px 8px;
  align-items: start;
}

.content-column,
.content-col {
  min-width: 0;
}

.page-aside,
.page-sidebar,
.page-toc {
  min-width: 0;
}

.toc,
.page-sidebar,
.page-aside,
.page-toc {
  position: sticky;
  top: 88px;
}

.toc-title,
.sidebar-title,
.aside-title {
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-line);
  color: var(--c-primary);
  font-size: 15px;
  font-weight: 600;
}

.toc-list,
.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toc-list a,
.sidebar-nav a {
  display: block;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.5;
}

.toc-list a:hover,
.sidebar-nav a:hover,
.toc-list a.is-active,
.sidebar-nav a.is-active {
  background: var(--c-accent-soft);
  border-left-color: var(--c-accent);
  color: var(--c-accent);
}

.content-block,
.content-section,
.page-title-block,
.help-topics,
.help-scene,
.help-steps,
.help-troubleshoot,
.help-manual,
.help-faq,
.section {
  margin-top: 40px;
}

.content-block:first-child,
.content-section:first-child,
.section:first-child {
  margin-top: 32px;
}

.block-title,
.content-section h2,
.section h2,
.help-topics h2,
.help-scene h2,
.help-steps h2,
.help-troubleshoot h2,
.help-manual h2,
.help-faq h2 {
  font-size: 1.35rem;
}

.block-intro,
.section-intro,
.content-section > p,
.section > p {
  margin-top: 12px;
  color: var(--c-muted);
  font-size: 15px;
  line-height: 1.75;
}

.block-figure,
.section-media,
.page-media,
.scene-figure {
  margin-top: 20px;
}

.block-figure img,
.section-media img,
.page-media img,
.scene-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.two-col,
.split-columns,
.stage-columns,
.rules-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 20px;
}

.col,
.split-col,
.stage-col,
.rules-intro,
.rules-list {
  min-width: 0;
}

.col-title,
.split-col h3,
.stage-col-title,
.rules-intro h3 {
  font-size: 1.05rem;
}

.col-list,
.split-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}

.col-list li,
.split-col li {
  position: relative;
  padding-left: 18px;
  color: var(--c-text);
  font-size: 15px;
}

.col-list li::before,
.split-col li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 0;
  width: 6px;
  height: 6px;
  background: var(--c-accent);
  border-radius: 50%;
}

/* --------------------------------------------------------------------------
   pages · 会员权益
   -------------------------------------------------------------------------- */

.group-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.group-card {
  min-width: 0;
  padding: 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.group-name {
  font-size: 1.05rem;
}

.group-audience {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 14px;
}

.group-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
}

.group-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
}

.group-list li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 0;
  width: 6px;
  height: 6px;
  background: var(--c-accent);
  border-radius: 50%;
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 20px;
  counter-reset: usage;
}

.step-item {
  position: relative;
  padding: 16px 18px 16px 56px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  counter-increment: usage;
}

.step-item::before {
  content: counter(usage);
  position: absolute;
  top: 16px;
  left: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: var(--c-primary);
  border-radius: 50%;
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
}

.step-item .step-name {
  font-size: 1.05rem;
}

.step-item .step-desc {
  margin-top: 6px;
  color: var(--c-muted);
  font-size: 15px;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.link-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.link-card:hover {
  border-color: var(--c-accent);
  box-shadow: var(--shadow-raise);
}

.link-card .link-name {
  font-size: 1.05rem;
}

.link-card .link-desc {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 14px;
}

.link-card .link-more {
  align-self: flex-start;
  margin-top: 14px;
  color: var(--c-accent);
  font-size: 14px;
  font-weight: 500;
}

.link-card .link-more:hover {
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   pages · 办理流程
   -------------------------------------------------------------------------- */

.check-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

.check-list li {
  position: relative;
  padding: 14px 16px 14px 44px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  font-size: 15px;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  top: 14px;
  left: 16px;
  color: var(--c-accent);
  font-size: 16px;
  font-weight: 700;
}

.check-list .check-name {
  display: block;
}

.stage-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 20px;
}

.stage-block {
  min-width: 0;
  padding: 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-primary);
  border-radius: var(--radius);
}

.stage-block > h3 {
  font-size: 1.1rem;
}

.stage-columns {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--c-line);
}

.stage-col-title {
  color: var(--c-accent);
  font-size: 14px;
  font-weight: 600;
}

.stage-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}

.stage-col li {
  position: relative;
  padding-left: 16px;
  color: var(--c-text);
  font-size: 15px;
}

.stage-col li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 0;
  width: 5px;
  height: 5px;
  background: var(--c-line-strong);
  border-radius: 50%;
}

.node-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
  counter-reset: node;
}

.node-list li {
  position: relative;
  padding: 14px 16px 14px 52px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  font-size: 15px;
  counter-increment: node;
}

.node-list li::before {
  content: counter(node);
  position: absolute;
  top: 14px;
  left: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--c-accent-soft);
  border-radius: 50%;
  color: var(--c-accent);
  font-size: 13px;
  font-weight: 600;
}

.node-name {
  display: block;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.related-list a {
  display: flex;
  align-items: center;
  min-height: 46px;
  padding: 0 16px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  color: var(--c-text);
  font-size: 15px;
}

.related-list a:hover {
  background: var(--c-accent-soft);
  border-color: var(--c-accent);
  color: var(--c-accent);
}

/* --------------------------------------------------------------------------
   pages · 活动目录
   -------------------------------------------------------------------------- */

.category-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.category-card {
  min-width: 0;
  padding: 18px 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-accent);
  border-radius: var(--radius);
}

.category-card h3 {
  font-size: 1.05rem;
}

.category-card p {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 14px;
}

.category-count {
  display: inline-block;
  margin-top: 12px;
  padding: 3px 10px;
  background: var(--c-accent-soft);
  border-radius: 999px;
  color: var(--c-accent);
  font-size: 13px;
}

.activity-items {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 20px;
}

.activity-item {
  min-width: 0;
  padding: 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.activity-item:hover {
  border-color: var(--c-line-strong);
  box-shadow: var(--shadow-raise);
}

.activity-item h3 {
  font-size: 1.1rem;
}

.activity-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.6;
}

.tag-cat {
  background: #eef2f6;
  color: var(--c-primary);
}

.tag-open {
  background: var(--c-accent-soft);
  color: var(--c-accent);
}

.tag-soon {
  background: var(--c-warn-soft);
  color: var(--c-warn);
}

.tag-closed {
  background: #eef0ef;
  color: var(--c-muted);
}

.activity-summary {
  margin-top: 12px;
  color: var(--c-text);
  font-size: 15px;
}

.activity-detail {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 6px 16px;
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
  font-size: 14px;
}

.activity-detail dt {
  color: var(--c-muted);
}

.activity-detail dd {
  margin: 0;
  color: var(--c-text);
}

.rules-layout .rules-list {
  margin-top: 0;
}

.rule-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
  counter-reset: activityrule;
}

.rule-items li {
  position: relative;
  padding: 12px 16px 12px 48px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  font-size: 15px;
  counter-increment: activityrule;
}

.rule-items li::before {
  content: counter(activityrule);
  position: absolute;
  top: 13px;
  left: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: var(--c-accent-soft);
  border-radius: 50%;
  color: var(--c-accent);
  font-size: 12px;
  font-weight: 600;
}

.change-blocks {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.change-block {
  min-width: 0;
  padding: 18px 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.change-block h3 {
  font-size: 1.05rem;
}

.change-block p {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 14px;
}

/* --------------------------------------------------------------------------
   pages · 使用帮助
   -------------------------------------------------------------------------- */

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.topic-card {
  min-width: 0;
  padding: 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.topic-card h3 {
  font-size: 1.05rem;
}

.topic-desc {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 14px;
}

.topic-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
}

.topic-list a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  color: var(--c-text);
  font-size: 14px;
}

.topic-list a:hover {
  background: var(--c-accent-soft);
  color: var(--c-accent);
}

.help-scene .scene-media {
  margin-top: 20px;
}

.help-scene > p {
  margin-top: 16px;
  color: var(--c-muted);
  font-size: 15px;
}

.step-block {
  min-width: 0;
  margin-top: 16px;
  padding: 18px 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--radius);
}

.step-block h3 {
  font-size: 1.05rem;
}

.step-block .step-path {
  margin-top: 8px;
  font-size: 15px;
}

.step-block .step-result {
  margin-top: 6px;
  color: var(--c-muted);
  font-size: 14px;
}

.troubleshoot-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.troubleshoot-step {
  min-width: 0;
  padding: 18px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-primary);
  border-radius: var(--radius);
}

.troubleshoot-step .step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: var(--c-primary);
  border-radius: 50%;
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
}

.troubleshoot-step h3 {
  margin-top: 12px;
  font-size: 1rem;
}

.troubleshoot-step p {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.7;
}

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

.manual-item {
  padding: 16px 18px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.manual-item h3 {
  font-size: 1.05rem;
}

.manual-item p {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 14px;
}

/* --------------------------------------------------------------------------
   pages · 问题反馈
   -------------------------------------------------------------------------- */

.page-hero {
  margin-top: 24px;
}

.page-hero .page-lede {
  color: var(--c-muted);
  font-size: 15px;
}

.scope-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.scope-card {
  min-width: 0;
  padding: 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.scope-card h3 {
  font-size: 1.05rem;
}

.scope-card > p {
  margin-top: 8px;
  color: var(--c-muted);
  font-size: 14px;
}

.scope-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
}

.scope-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
}

.scope-list li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 0;
  width: 6px;
  height: 6px;
  background: var(--c-accent);
  border-radius: 50%;
}

.info-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

.info-item {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 14px 16px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  font-size: 15px;
}

.info-name {
  color: var(--c-primary);
  font-weight: 600;
}

.info-use {
  color: var(--c-muted);
}

.process-steps {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 20px;
}

.process-step {
  position: relative;
  min-width: 0;
  padding: 16px 18px 16px 56px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.process-step .step-index {
  position: absolute;
  top: 16px;
  left: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: var(--c-primary);
  border-radius: 50%;
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
}

.process-step .step-name {
  font-size: 1.05rem;
}

.process-step .step-desc {
  margin-top: 6px;
  font-size: 15px;
}

.process-step .step-state {
  margin-top: 6px;
  color: var(--c-muted);
  font-size: 14px;
}

.exclude-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

.exclude-item {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 6px 16px;
  padding: 14px 16px;
  background: #f7f9f8;
  border-left: 3px solid var(--c-line-strong);
  border-radius: var(--radius-sm);
  font-size: 15px;
}

.exclude-name {
  color: var(--c-text);
}

.exclude-go {
  color: var(--c-muted);
  font-size: 14px;
}

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */

.error-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.error-panel {
  padding: 40px 32px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  text-align: center;
}

.error-code {
  color: var(--c-accent);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
}

.error-title {
  margin-top: 14px;
  font-size: clamp(1.4rem, 1.1rem + 1.2vw, 1.9rem);
}

.error-desc {
  max-width: 620px;
  margin: 14px auto 0;
  color: var(--c-muted);
  font-size: 15px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 26px;
}

.error-links {
  margin-top: 32px;
}

.error-links-title {
  font-size: 1.2rem;
}

.error-link-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.error-link-list a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 14px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  color: var(--c-text);
  font-size: 15px;
  text-align: center;
}

.error-link-list a:hover {
  background: var(--c-accent-soft);
  border-color: var(--c-accent);
  color: var(--c-accent);
}

/* --------------------------------------------------------------------------
   responsive · 900px
   -------------------------------------------------------------------------- */

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .hero-media {
    order: 2;
  }

  .zone-grid,
  .task-groups,
  .link-grid,
  .change-blocks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .flow-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .rules-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .footer-nav {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .page-aside,
  .page-sidebar,
  .page-toc {
    position: static;
    top: auto;
    order: 2;
    padding: 16px 18px;
    background: var(--c-surface);
    border: 1px solid var(--c-line);
    border-radius: var(--radius);
  }

  .toc,
  .page-sidebar,
  .page-aside,
  .page-toc {
    position: static;
    top: auto;
  }

  .page-layout > .content-column,
  .page-layout > .content-col,
  .page-layout > .inner-main {
    order: 1;
  }

  .troubleshoot-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .error-link-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* --------------------------------------------------------------------------
   responsive · 640px
   -------------------------------------------------------------------------- */

@media (max-width: 640px) {
  .header-inner {
    padding: 0 16px;
    min-height: 58px;
  }

  .site-nav {
    flex: 0 0 auto;
    justify-content: flex-end;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

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

  .nav-toggle {
    display: flex;
  }

  .mobile-nav.is-open {
    display: block;
  }

  .inner-main,
  .page-layout,
  .hero-inner,
  .section-head,
  .zone-grid,
  .task-groups,
  .flow-track,
  .flow-media,
  .rules-inner,
  .faq-list,
  .boundary-inner,
  .footer-inner,
  .footer-copy,
  .related-links,
  .error-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .section-hero,
  .section-zone,
  .section-tasks,
  .section-flow,
  .section-faq {
    padding: 36px 0;
  }

  .section-notice,
  .section-rules,
  .section-boundary {
    padding: 30px 0;
  }

  .zone-grid,
  .task-groups,
  .group-grid,
  .link-grid,
  .category-grid,
  .topic-grid,
  .scope-grid,
  .change-blocks,
  .two-col,
  .split-columns,
  .stage-columns,
  .rules-layout,
  .boundary-list,
  .related-list,
  .error-link-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .flow-track,
  .troubleshoot-flow {
    grid-template-columns: minmax(0, 1fr);
  }

  .notice-bar {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
    padding: 18px;
  }

  .notice-link {
    justify-content: center;
  }

  .footer-nav {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .info-item,
  .exclude-item,
  .activity-detail {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .hero-actions .btn {
    flex: 1 1 100%;
  }

  .error-panel {
    padding: 30px 20px;
  }

  .error-actions .btn {
    flex: 1 1 100%;
  }
}

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}