@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:wght@400;500;600;700&family=Lato:wght@300;400;700&display=swap');

/* ===========================
   基础变量与重置
=========================== */
:root {
  --color-ink: #000000;
  --color-paper: #ffffff;
  --color-rule: #000000;
  --color-mid: #555555;
  --color-light: #f4f4f4;
  --color-border: #cccccc;
  --color-accent: #000000;

  --font-heading: 'EB Garamond', Georgia, 'Times New Roman', serif;
  --font-body: 'Lato', 'Helvetica Neue', Helvetica, Arial, sans-serif;

  --base: 8px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-8: 64px;
  --space-10: 80px;
  --space-12: 96px;
  --space-16: 128px;

  --grid-cols: 12;
  --grid-gap: 1rem;
  --grid-padding: clamp(1rem, 4vw, 3rem);

  --radius-card: 28px;

  --header-h: 64px;
  --sticky-h: 40px;

  --transition-base: 200ms ease;
  --transition-overlay: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 17px;
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--color-ink);
  background: var(--color-paper);
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

/* ===========================
   网格系统
=========================== */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gap);
  padding-left: var(--grid-padding);
  padding-right: var(--grid-padding);
  max-width: 1440px;
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}

.col-span-1  { grid-column: span 1; }
.col-span-2  { grid-column: span 2; }
.col-span-3  { grid-column: span 3; }
.col-span-4  { grid-column: span 4; }
.col-span-5  { grid-column: span 5; }
.col-span-6  { grid-column: span 6; }
.col-span-7  { grid-column: span 7; }
.col-span-8  { grid-column: span 8; }
.col-span-9  { grid-column: span 9; }
.col-span-10 { grid-column: span 10; }
.col-span-11 { grid-column: span 11; }
.col-span-12 { grid-column: span 12; }

.col-start-2  { grid-column-start: 2; }
.col-start-3  { grid-column-start: 3; }
.col-start-4  { grid-column-start: 4; }
.col-start-5  { grid-column-start: 5; }
.col-start-6  { grid-column-start: 6; }
.col-start-9  { grid-column-start: 9; }
.col-start-10 { grid-column-start: 10; }

/* ===========================
   遮罩全屏菜单
=========================== */
.overlay-menu {
  position: fixed;
  inset: 0;
  background: var(--color-ink);
  color: var(--color-paper);
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-overlay);
}

.overlay-menu.is-open {
  opacity: 1;
  pointer-events: all;
}

.overlay-menu[aria-hidden="false"] {
  opacity: 1;
  pointer-events: all;
}

.overlay-inner {
  width: 100%;
  max-width: 1440px;
  padding: var(--grid-padding);
  position: relative;
}

.overlay-close {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  background: none;
  border: 1px solid var(--color-paper);
  color: var(--color-paper);
  font-family: var(--font-body);
  font-size: 1rem;
  cursor: pointer;
  padding: var(--space-1) var(--space-2);
  min-height: 40px;
  min-width: 40px;
  transition: background var(--transition-base), color var(--transition-base);
}

.overlay-close:hover {
  background: var(--color-paper);
  color: var(--color-ink);
}

.overlay-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.overlay-nav a {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 3rem);
  font-weight: 500;
  color: var(--color-paper);
  line-height: 1.2;
  border-bottom: 1px solid rgba(255,255,255,0.15);
  padding-bottom: var(--space-2);
  transition: opacity var(--transition-base);
}

.overlay-nav a:hover,
.overlay-nav a[aria-current="page"] {
  opacity: 0.6;
}

/* ===========================
   顶部导航栏
=========================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 800;
  background: var(--color-paper);
  border-bottom: 2px solid var(--color-ink);
  height: var(--header-h);
  display: flex;
  align-items: center;
}

.header-inner {
  align-items: center;
  height: 100%;
}

.header-brand {
  display: flex;
  align-items: center;
}

.header-brand .brand-text {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.logo-mark {
  height: 40px;
  width: auto;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

.header-contact {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--color-ink);
  padding: var(--space-1) var(--space-2);
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: background var(--transition-base), color var(--transition-base);
}

.header-contact:hover,
.header-contact[aria-current="page"] {
  background: var(--color-ink);
  color: var(--color-paper);
}

.hamburger {
  background: var(--color-ink);
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  min-height: 40px;
  min-width: 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-paper);
  transition: transform var(--transition-base);
}

.hamburger:hover span {
  opacity: 0.7;
}

/* ===========================
   粘性锚点条
=========================== */
.sticky-anchor {
  position: sticky;
  top: var(--header-h);
  z-index: 700;
  background: var(--color-paper);
  border-bottom: 1px solid var(--color-border);
  min-height: var(--sticky-h);
  display: flex;
  align-items: center;
}

.sticky-inner {
  align-items: center;
  width: 100%;
}

/* ===========================
   面包屑
=========================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-wrap: wrap;
  padding: var(--space-1) 0;
}

.breadcrumb a,
.breadcrumb span {
  font-size: 0.8rem;
  font-family: var(--font-body);
  color: var(--color-mid);
}

.breadcrumb a:hover {
  color: var(--color-ink);
  text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
  color: var(--color-ink);
  font-weight: 700;
}

/* ===========================
   通用页面标签
=========================== */
.page-label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-left: 3px solid var(--color-ink);
  padding-left: var(--space-1);
  margin-bottom: var(--space-2);
  color: var(--color-mid);
}

/* ===========================
   首页 Hero
=========================== */
.hero--home {
  min-height: 45vh;
  background: var(--color-ink);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  padding: var(--space-10) 0 var(--space-8);
}

.hero-bg-pattern {
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 31px, rgba(255,255,255,0.05) 31px, rgba(255,255,255,0.05) 32px),
    repeating-linear-gradient(90deg, transparent, transparent 31px, rgba(255,255,255,0.05) 31px, rgba(255,255,255,0.05) 32px);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
}

.hero-content {
  color: var(--color-paper);
  text-align: right;
}

.hero-eyebrow {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.6;
  margin-bottom: var(--space-2);
}

.hero-h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 4.5rem);
  font-weight: 600;
  line-height: 1.1;
  margin-bottom: var(--space-3);
}

.hero-lead {
  font-size: 1rem;
  line-height: 1.6;
  opacity: 0.8;
  margin-bottom: var(--space-4);
  max-width: 480px;
  margin-left: auto;
}

.hero-cta {
  display: inline-block;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  padding: var(--space-2) var(--space-4);
  min-height: 48px;
  line-height: 48px;
  padding-top: 0;
  padding-bottom: 0;
  letter-spacing: 0.04em;
  transition: background var(--transition-base), color var(--transition-base);
}

.hero-cta:hover {
  background: rgba(255,255,255,0.85);
}

/* ===========================
   首页正文区块
=========================== */
.home-content-section {
  padding: var(--space-10) 0;
  border-bottom: 1px solid var(--color-border);
}

/* ===========================
   首页频道列表
=========================== */
.channels-section {
  padding: var(--space-10) 0;
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.section-sub {
  font-size: 0.9rem;
  color: var(--color-mid);
  margin-bottom: var(--space-6);
}

.channels-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0;
}

.channel-item {
  border-top: 1px solid var(--color-border);
}

.channel-item:last-child {
  border-bottom: 1px solid var(--color-border);
}

.channel-item a {
  display: grid;
  grid-template-columns: 48px 1fr 1fr;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-2);
  transition: background var(--transition-base);
}

.channel-item a:hover {
  background: var(--color-light);
}

.channel-num {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-border);
  font-variant-numeric: tabular-nums;
}

.channel-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
}

.channel-desc {
  font-size: 0.8rem;
  color: var(--color-mid);
  line-height: 1.4;
}

/* ===========================
   首页推荐卡片
=========================== */
.featured-section {
  padding: var(--space-10) 0;
}

.cards-wrap {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-3);
}

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

.card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.card:hover::after {
  transform: scaleX(1);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.card-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: var(--space-4);
}

.card-body {
  flex: 1;
}

.card-eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-mid);
  margin-bottom: var(--space-2);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-2);
}

.card-desc {
  font-size: 0.85rem;
  color: var(--color-mid);
  line-height: 1.5;
}

.card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-mid);
}

.card-arrow {
  font-size: 1rem;
  color: var(--color-ink);
}

/* ===========================
   频道页
=========================== */
.channel-hero {
  padding: var(--space-10) 0 var(--space-8);
  border-bottom: 2px solid var(--color-ink);
}

.channel-h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 600;
  line-height: 1.15;
  margin-bottom: var(--space-3);
}

.channel-lead {
  font-size: 1.05rem;
  color: var(--color-mid);
  max-width: 640px;
}

.channel-content {
  padding: var(--space-10) 0;
  border-bottom: 1px solid var(--color-border);
}

.channel-articles {
  padding: var(--space-10) 0;
}

.articles-heading {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-ink);
}

.articles-list {
  display: flex;
  flex-direction: column;
}

.article-item {
  border-bottom: 1px solid var(--color-border);
}

.article-item-link {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  transition: background var(--transition-base);
}

.article-item-link:hover {
  background: var(--color-light);
  padding-left: var(--space-2);
  padding-right: var(--space-2);
  margin-left: calc(-1 * var(--space-2));
  margin-right: calc(-1 * var(--space-2));
}

.article-item-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-1);
}

.article-item-num {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 400;
  color: var(--color-border);
  line-height: 1;
}

.article-item-meta time {
  font-size: 0.75rem;
  color: var(--color-mid);
}

.article-item-body h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
  line-height: 1.35;
}

.article-item-body p {
  font-size: 0.88rem;
  color: var(--color-mid);
  line-height: 1.5;
}

/* ===========================
   文章页
=========================== */
.article-header-section {
  padding: var(--space-10) 0 var(--space-6);
  border-bottom: 2px solid var(--color-ink);
}

.article-meta-top {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  flex-wrap: wrap;
}

.article-channel-tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--color-ink);
  color: var(--color-paper);
  padding: 2px var(--space-1);
}

.article-date {
  font-size: 0.8rem;
  color: var(--color-mid);
}

.article-h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 3.5rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-3);
}

.article-lead {
  font-size: 1.1rem;
  color: var(--color-mid);
  max-width: 640px;
  line-height: 1.6;
}

.article-updated {
  font-size: 0.8rem;
  color: var(--color-mid);
  margin-top: var(--space-2);
}

.article-hero-section {
  padding: var(--space-6) 0 0;
}

.article-hero-img {
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
}

.article-body-section {
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-border);
}

.article-aside {
  padding-top: var(--space-2);
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-4);
}

.aside-block {
  margin-bottom: var(--space-4);
}

.aside-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-mid);
  margin-bottom: var(--space-1);
}

.aside-channel-link,
.aside-nav-link {
  display: block;
  font-size: 0.88rem;
  padding: var(--space-1) 0;
  border-bottom: 1px solid var(--color-border);
  transition: padding-left var(--transition-base);
}

.aside-channel-link:hover,
.aside-nav-link:hover {
  padding-left: var(--space-1);
  text-decoration: underline;
}

.aside-brand {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
}

.aside-type {
  font-size: 0.8rem;
  color: var(--color-mid);
}

/* ===========================
   相关文章
=========================== */
.related-section {
  padding: var(--space-8) 0;
}

.related-heading {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-ink);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-3);
}

.related-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  position: relative;
}

.related-item::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: var(--color-ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.related-item:hover::after {
  transform: scaleX(1);
}

.related-item a {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
}

.related-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
}

.related-desc {
  font-size: 0.8rem;
  color: var(--color-mid);
  line-height: 1.4;
}

/* ===========================
   关于页
=========================== */
.about-intro {
  padding: var(--space-10) 0 var(--space-8);
  border-bottom: 2px solid var(--color-ink);
}

.about-h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 600;
  line-height: 1.15;
  margin-bottom: var(--space-3);
}

.about-lead {
  font-size: 1.05rem;
  color: var(--color-mid);
}

.about-rule-col {
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-rule-lines {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: 100%;
}

.rule-line {
  height: 1px;
  background: var(--color-ink);
}

.rule-line:nth-child(2) { width: 70%; }
.rule-line:nth-child(3) { width: 40%; }

.about-body {
  padding: var(--space-10) 0;
  border-bottom: 1px solid var(--color-border);
}

.about-aside {
  padding-top: var(--space-2);
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-4);
}

.about-nav-section {
  padding: var(--space-10) 0;
}

.about-nav-heading {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-ink);
}

.about-nav-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-3);
}

.about-nav-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  position: relative;
}

.about-nav-item::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: var(--color-ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.about-nav-item:hover::after {
  transform: scaleX(1);
}

.about-nav-item a {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
}

.about-nav-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
}

.about-nav-desc {
  font-size: 0.8rem;
  color: var(--color-mid);
  line-height: 1.4;
}

/* ===========================
   隐私页
=========================== */
.privacy-header {
  padding: var(--space-10) 0 var(--space-6);
  border-bottom: 2px solid var(--color-ink);
}

.privacy-h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 3.5rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-3);
}

.privacy-lead {
  font-size: 1rem;
  color: var(--color-mid);
}

.privacy-body {
  padding: var(--space-8) 0;
}

.privacy-aside {
  padding-top: var(--space-2);
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-4);
}

/* ===========================
   正文排版 Prose
=========================== */
.prose {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-ink);
}

.prose h2 {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  font-weight: 600;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--color-border);
}

.prose h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

.prose h4 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  margin-top: var(--space-4);
  margin-bottom: var(--space-1);
}

.prose p {
  margin-bottom: var(--space-3);
}

.prose ul,
.prose ol {
  margin-left: var(--space-4);
  margin-bottom: var(--space-3);
}

.prose li {
  margin-bottom: var(--space-1);
  line-height: 1.7;
}

.prose a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  opacity: 0.7;
}

.prose blockquote {
  border-left: 4px solid var(--color-ink);
  padding-left: var(--space-3);
  margin: var(--space-4) 0;
  font-style: italic;
  color: var(--color-mid);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-4);
  font-size: 0.9rem;
}

.prose th {
  background: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-1) var(--space-2);
  text-align: left;
  font-weight: 700;
}

.prose td {
  padding: var(--space-1) var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.prose tr:nth-child(even) td {
  background: var(--color-light);
}

.prose img {
  border: 1px solid var(--color-border);
  border-radius: 4px;
  margin: var(--space-4) 0;
}

.prose code {
  font-family: 'Courier New', monospace;
  font-size: 0.88em;
  background: var(--color-light);
  padding: 1px 5px;
  border-radius: 3px;
}

.prose pre {
  background: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-3);
  overflow-x: auto;
  margin-bottom: var(--space-4);
  border-radius: 4px;
}

.prose--legal {
  font-size: 0.95rem;
}

/* ===========================
   页脚
=========================== */
.site-footer {
  border-top: 2px solid var(--color-ink);
  margin-top: var(--space-12);
}

.footer-cta {
  background: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-8) 0;
  align-items: center;
}

.footer-cta > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.footer-cta-text {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2vw, 1.8rem);
  font-weight: 500;
}

.footer-cta-btn {
  display: inline-block;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0 var(--space-4);
  height: 48px;
  line-height: 48px;
  white-space: nowrap;
  transition: opacity var(--transition-base);
  min-height: 40px;
}

.footer-cta-btn:hover {
  opacity: 0.85;
}

.footer-body {
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-border);
}

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

.footer-brand {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.footer-about {
  font-size: 0.85rem;
  color: var(--color-mid);
  line-height: 1.6;
}

.site-footer nav dl {
  list-style: none;
}

.site-footer nav dt {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-mid);
  margin-bottom: var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--color-border);
}

.site-footer nav dd {
  margin: 0;
}

.site-footer nav dd a {
  display: block;
  font-size: 0.88rem;
  padding: 6px 0;
  min-height: 40px;
  line-height: 40px;
  border-bottom: 1px solid var(--color-light);
  transition: padding-left var(--transition-base);
}

.site-footer nav dd a:hover {
  padding-left: var(--space-1);
}

.footer-bottom {
  padding: var(--space-3) 0;
  align-items: center;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-mid);
}

.footer-bottom-links {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

.footer-bottom-links a {
  font-size: 0.8rem;
  color: var(--color-mid);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

.footer-bottom-links a:hover {
  color: var(--color-ink);
  text-decoration: underline;
}

/* ===========================
   默认页
=========================== */
.default-header {
  padding: var(--space-10) 0 var(--space-6);
  border-bottom: 2px solid var(--color-ink);
}

.default-header h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 3.5rem);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.page-desc {
  font-size: 1rem;
  color: var(--color-mid);
}

.default-body {
  padding: var(--space-8) 0;
}

/* ===========================
   Stagger 动画
=========================== */
@media (prefers-reduced-motion: no-preference) {
  .stagger-item {
    opacity: 0;
    transform: translateY(16px);
    animation: staggerIn 400ms ease forwards;
    animation-delay: calc(var(--stagger-i, 0) * 80ms + 100ms);
  }

  @keyframes staggerIn {
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .parallax-hero {
    will-change: transform;
  }
}

@media (prefers-reduced-motion: reduce) {
  .stagger-item {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

/* ===========================
   响应式断点
=========================== */
@media (max-width: 1024px) {
  .col-span-3.article-aside,
  .col-span-3.about-aside,
  .col-span-3.privacy-aside {
    display: none;
  }

  .col-span-8.col-start-2.prose,
  .col-span-7.col-start-2.prose {
    grid-column: 1 / -1;
  }

  .col-span-8.col-start-2 {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  :root {
    --grid-padding: 1rem;
    --header-h: 56px;
  }

  html { font-size: 16px; }

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

  [class*="col-span-"],
  [class*="col-start-"] {
    grid-column: 1 / -1 !important;
  }

  .hero--home {
    min-height: 45vh;
    padding: var(--space-8) 0 var(--space-6);
    align-items: center;
  }

  .hero-content {
    text-align: left;
  }

  .hero-lead {
    margin-left: 0;
  }

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

  .channel-item a {
    grid-template-columns: 40px 1fr;
  }

  .channel-desc {
    display: none;
  }

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

  .article-item-link {
    grid-template-columns: 48px 1fr;
  }

  .footer-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
  }

  .footer-bottom {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    align-items: flex-start;
  }

  .footer-bottom-links {
    justify-content: flex-start;
  }

  .footer-cta > div {
    flex-direction: column;
    align-items: flex-start;
  }

  .about-rule-col {
    display: none;
  }

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

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

  .overlay-nav a {
    font-size: 1.5rem;
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-left: var(--grid-padding);
    padding-right: var(--grid-padding);
  }

  .sticky-anchor {
    top: var(--header-h);
  }
}

@media (max-width: 480px) {
  .hero-h1 {
    font-size: 1.8rem;
  }

  .channel-h1,
  .article-h1,
  .about-h1,
  .privacy-h1 {
    font-size: 1.6rem;
  }
}