/* ==========================================================================
   AIworks — 单文件手写样式
   清爽浅色风 / 蓝绿主色 #0d9488 系 / 深蓝文字 #0f172a
   无外链字体、无 CDN、无框架
   ========================================================================== */

:root {
  /* 配色 */
  --color-bg: #ffffff;
  --color-bg-alt: #f6f9f9;
  --color-surface: #ffffff;
  --color-primary: #0d9488;
  --color-primary-dark: #0f766e;
  --color-primary-darker: #115e59;
  --color-primary-light: #ccfbf1;
  --color-primary-faint: #f0fdfa;
  --color-text: #0f172a;
  --color-text-soft: #334155;
  --color-muted: #64748b;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-amber: #d97706;

  /* 尺寸 */
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05), 0 1px 3px rgba(15, 23, 42, 0.04);
  --shadow: 0 4px 12px rgba(15, 23, 42, 0.06), 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 14px 32px rgba(15, 23, 42, 0.10), 0 4px 10px rgba(15, 23, 42, 0.05);
  --container: 1140px;
  --container-narrow: 760px;

  /* 排版 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC",
    "WenQuanYi Micro Hei", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --line: 1.8;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: var(--line);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
svg {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary-dark);
  text-decoration: none;
  transition: color 0.18s ease;
}

a:hover {
  color: var(--color-primary-darker);
  text-decoration: underline;
  text-underline-offset: 3px;
}

h1,
h2,
h3,
h4 {
  color: var(--color-text);
  line-height: 1.35;
  margin: 0 0 0.6em;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 2.35rem;
}

h2 {
  font-size: 1.7rem;
}

h3 {
  font-size: 1.2rem;
}

p {
  margin: 0 0 1.15em;
}

ul,
ol {
  padding-left: 1.4em;
}

li {
  margin-bottom: 0.4em;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-primary-faint);
  border: 1px solid var(--color-border);
  border-radius: 5px;
  padding: 0.1em 0.38em;
}

hr.divider {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 2.2em 0;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.container.narrow {
  max-width: var(--container-narrow);
}

.center {
  text-align: center;
}

.center-actions {
  justify-content: center;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 200;
}

.skip-link:focus {
  left: 0;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ---------------------------------------------------------------- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.18s ease, background 0.18s ease,
    color 0.18s ease, border-color 0.18s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  box-shadow: var(--shadow);
}

.btn-outline {
  background: #fff;
  color: var(--color-primary-dark);
  border-color: var(--color-border-strong);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-darker);
  box-shadow: var(--shadow-sm);
}

.btn-ghost {
  background: var(--color-primary-faint);
  color: var(--color-primary-darker);
  border-color: var(--color-primary-light);
}

.btn-ghost:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-darker);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.02rem;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.88rem;
}

/* ---------------------------------------------------------------- 导航 --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.2s ease;
}

.site-header.is-scrolled {
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
}

.brand:hover {
  text-decoration: none;
  color: var(--color-text);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: linear-gradient(135deg, #0d9488, #0f766e);
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: var(--shadow-sm);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-text strong {
  font-size: 1.06rem;
  letter-spacing: -0.01em;
}

.brand-text small {
  font-size: 0.72rem;
  color: var(--color-muted);
  letter-spacing: 0.01em;
}

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

.nav-link {
  display: inline-block;
  padding: 9px 14px;
  border-radius: 999px;
  color: var(--color-text-soft);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-link:hover {
  background: var(--color-primary-faint);
  color: var(--color-primary-darker);
  text-decoration: none;
}

.nav-link.is-active {
  background: var(--color-primary-light);
  color: var(--color-primary-darker);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0 10px;
  background: #fff;
  border: 1px solid var(--color-border-strong);
  border-radius: 10px;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

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

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

/* ---------------------------------------------------------------- Hero --- */
.hero {
  position: relative;
  padding: 84px 0 72px;
  background: linear-gradient(180deg, var(--color-primary-faint) 0%, #ffffff 78%);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  right: -140px;
  top: -140px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(13, 148, 136, 0.16), rgba(13, 148, 136, 0));
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 840px;
}

.hero-eyebrow {
  display: inline-block;
  margin: 0 0 18px;
  padding: 6px 14px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--color-primary-light);
  color: var(--color-primary-darker);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.hero h1 {
  font-size: 3.1rem;
  margin-bottom: 0.35em;
  letter-spacing: -0.025em;
}

.hero-sub {
  display: block;
  margin-top: 12px;
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  letter-spacing: -0.01em;
}

.hero-lead {
  font-size: 1.12rem;
  color: var(--color-text-soft);
  max-width: 640px;
}

.hero-lead-second {
  color: var(--color-muted);
  font-size: 1.02rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 30px 0 40px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 36px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
  margin: 0;
}

.hero-stats strong {
  font-size: 1.5rem;
  color: var(--color-primary-dark);
  line-height: 1.2;
}

.hero-stats span {
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* ------------------------------------------------------------- 页面头部 --- */
.page-hero {
  padding: 52px 0 40px;
  background: linear-gradient(180deg, var(--color-primary-faint) 0%, #ffffff 90%);
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  margin-bottom: 0.35em;
}

.page-lead {
  font-size: 1.08rem;
  color: var(--color-text-soft);
  max-width: 720px;
  margin-bottom: 0;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 0.86rem;
  color: var(--color-muted);
}

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

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

.error-hero {
  padding: 90px 0 70px;
}

.error-code {
  font-size: 4.6rem;
  font-weight: 800;
  color: var(--color-primary-light);
  margin: 0 0 0.1em;
  letter-spacing: -0.04em;
  line-height: 1;
}

.error-hero .page-lead {
  margin: 0 auto 30px;
}

/* ---------------------------------------------------------------- 区块 --- */
.section {
  padding: 64px 0;
}

.section-alt {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-head {
  max-width: 720px;
  margin-bottom: 34px;
}

.section-head h2 {
  margin-bottom: 0.35em;
}

.section-head p {
  color: var(--color-muted);
  margin: 0;
}

.section-more {
  margin: 34px 0 0;
}

.empty-state,
.notice {
  padding: 22px 24px;
  background: var(--color-primary-faint);
  border: 1px dashed var(--color-primary-light);
  border-radius: var(--radius);
  color: var(--color-text-soft);
  margin: 0;
}

/* ---------------------------------------------------------------- 网格 --- */
.grid {
  display: grid;
  gap: 22px;
}

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

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

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

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

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

/* ---------------------------------------------------------------- 卡片 --- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.article-card {
  padding: 0;
}

.card-link {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 24px;
  color: var(--color-text);
  text-decoration: none;
}

.card-link:hover {
  text-decoration: none;
  color: var(--color-text);
}

.card-title {
  font-size: 1.12rem;
  margin: 14px 0 10px;
  transition: color 0.18s ease;
}

.card-link:hover .card-title {
  color: var(--color-primary-dark);
}

.card-desc {
  color: var(--color-muted);
  font-size: 0.96rem;
  line-height: 1.72;
  margin: 0 0 14px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tools {
  margin: auto 0 12px;
  font-size: 0.86rem;
  color: var(--color-primary-darker);
  background: var(--color-primary-faint);
  border-radius: var(--radius-sm);
  padding: 7px 11px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* 分类标签 */
.tag {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 11px;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: var(--color-primary-light);
  color: var(--color-primary-darker);
}

.tag-tools {
  background: #ccfbf1;
  color: #115e59;
}

.tag-tutorials {
  background: #e0f2fe;
  color: #075985;
}

.tag-industry {
  background: #fef3c7;
  color: #92400e;
}

.chip {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text-soft);
  font-size: 0.78rem;
}

/* ------------------------------------------------------------ 支柱卡片 --- */
.pillar-card {
  padding-top: 30px;
}

.pillar-ratio {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
}

.pillar-card h3 {
  margin-bottom: 0.45em;
}

.pillar-card p {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin-bottom: 18px;
}

.pillar-link {
  margin-top: auto;
  font-weight: 600;
  font-size: 0.92rem;
}

.about-pillars {
  margin-bottom: 44px;
}

/* ------------------------------------------------------------ 价值点 --- */
.why-grid {
  gap: 20px;
}

.why-item {
  padding: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.why-item:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow);
}

.why-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.why-item h3 {
  font-size: 1.06rem;
  margin-bottom: 0.5em;
}

.why-item p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

/* ------------------------------------------------------------ 筛选栏 --- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.filter-btn {
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid var(--color-border-strong);
  background: #fff;
  color: var(--color-text-soft);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-darker);
}

.filter-btn.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  font-weight: 600;
}

.filter-status {
  margin: 0 0 24px;
  font-size: 0.88rem;
  color: var(--color-muted);
}

.is-hidden {
  display: none !important;
}

/* ------------------------------------------------------------ 工具卡片 --- */
.tool-card {
  gap: 0;
}

.tool-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.tool-name {
  font-size: 1.14rem;
  margin: 0;
}

.tool-cat {
  flex-shrink: 0;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--color-primary-faint);
  border: 1px solid var(--color-primary-light);
  color: var(--color-primary-darker);
  font-size: 0.74rem;
  font-weight: 600;
  white-space: nowrap;
}

.tool-position {
  color: var(--color-text-soft);
  font-size: 0.96rem;
  line-height: 1.72;
  margin-bottom: 14px;
}

.tool-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 14px;
}

.tool-stars {
  margin: 0 0 10px;
  color: var(--color-amber);
  font-size: 1rem;
  letter-spacing: 2px;
}

.stars-note {
  color: var(--color-muted);
  font-size: 0.8rem;
  letter-spacing: 0;
  margin-left: 6px;
}

.tool-note {
  color: var(--color-muted);
  font-size: 0.88rem;
  line-height: 1.7;
  margin-bottom: 18px;
}

.tool-card .btn {
  margin-top: auto;
  align-self: flex-start;
}

/* ------------------------------------------------------------ 文章正文 --- */
.post-header {
  padding: 40px 0 32px;
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, var(--color-primary-faint) 0%, #ffffff 92%);
}

.post-header h1 {
  font-size: 2.1rem;
  margin: 16px 0 0.5em;
  line-height: 1.32;
}

.post-desc {
  font-size: 1.06rem;
  color: var(--color-text-soft);
  margin-bottom: 18px;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--color-muted);
}

.article-tools,
.article-keywords {
  margin: 16px 0 0;
  font-size: 0.86rem;
  color: var(--color-primary-darker);
}

.article-keywords {
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
}

.post .prose {
  padding: 44px 0 8px;
}

.prose {
  font-size: 1.06rem;
  line-height: var(--line);
  color: var(--color-text-soft);
}

.prose h2 {
  margin: 1.9em 0 0.7em;
  padding-left: 14px;
  border-left: 4px solid var(--color-primary);
  font-size: 1.5rem;
  color: var(--color-text);
}

.prose h3 {
  margin: 1.5em 0 0.6em;
  font-size: 1.18rem;
  color: var(--color-text);
}

.prose h2:first-child,
.prose h3:first-child {
  margin-top: 0;
}

.prose p {
  margin: 0 0 1.2em;
}

.prose ul,
.prose ol {
  margin: 0 0 1.3em;
  padding-left: 1.5em;
}

.prose li {
  margin-bottom: 0.5em;
}

.prose li::marker {
  color: var(--color-primary);
}

.prose strong {
  color: var(--color-text);
  font-weight: 700;
}

.prose a {
  border-bottom: 1px solid var(--color-primary-light);
}

.prose a:hover {
  border-bottom-color: var(--color-primary);
  text-decoration: none;
}

.prose blockquote {
  margin: 1.6em 0;
  padding: 16px 22px;
  background: var(--color-primary-faint);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-text-soft);
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose hr.divider {
  margin: 2.4em 0;
}

/* ---------------------------------------------------------------- CTA --- */
.cta-block {
  padding: 70px 0;
  background: linear-gradient(135deg, #0f766e 0%, #0d9488 55%, #14b8a6 100%);
  color: #fff;
}

.cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.8fr);
  gap: 48px;
  align-items: center;
}

.cta-copy h2 {
  color: #fff;
  font-size: 2rem;
  margin-bottom: 0.5em;
}

.cta-copy p {
  color: rgba(255, 255, 255, 0.92);
  font-size: 1.04rem;
  max-width: 620px;
}

.cta-list {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
}

.cta-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
  color: rgba(255, 255, 255, 0.95);
  font-size: 0.98rem;
}

.cta-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.68em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #5eead4;
}

.cta-block .btn-primary {
  background: #fff;
  color: var(--color-primary-darker);
}

.cta-block .btn-primary:hover {
  background: #f0fdfa;
  color: var(--color-primary-darker);
}

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

.qr-placeholder {
  display: grid;
  place-items: center;
  width: 190px;
  height: 190px;
  margin: 0 auto 12px;
  border: 2px dashed rgba(255, 255, 255, 0.75);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

.qr-img {
  width: 190px;
  height: 190px;
  object-fit: contain;
  background: #fff;
  border-radius: var(--radius);
  padding: 8px;
}

.qr-caption {
  margin: 0;
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.88rem;
}

/* --------------------------------------------------------------- 关于 --- */
.follow-block {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin: 34px 0 44px;
}

.qr-cell {
  padding: 26px 22px;
  text-align: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.qr-cell .qr-placeholder {
  border-color: var(--color-border-strong);
  background: var(--color-bg-alt);
  color: var(--color-muted);
}

.qr-cell p {
  margin: 0;
  font-size: 0.95rem;
}

.follow-block + .prose h2 {
  margin-top: 0;
}

/* ---------------------------------------------------------------- 页脚 --- */
.site-footer {
  background: #f8fafc;
  border-top: 1px solid var(--color-border);
  padding: 56px 0 0;
  color: var(--color-text-soft);
  font-size: 0.94rem;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 36px;
  padding-bottom: 36px;
}

.footer-brand strong {
  display: block;
  font-size: 1.1rem;
  color: var(--color-text);
  margin-bottom: 8px;
}

.footer-brand p {
  color: var(--color-muted);
  font-size: 0.92rem;
  margin: 0;
  max-width: 360px;
}

.footer-nav h3,
.footer-follow h3 {
  font-size: 0.86rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: 14px;
}

.footer-nav a {
  display: block;
  margin-bottom: 9px;
  color: var(--color-text-soft);
  font-size: 0.94rem;
}

.footer-nav a:hover {
  color: var(--color-primary-dark);
}

.footer-follow p {
  color: var(--color-text-soft);
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.9;
}

.footer-bottom {
  padding: 18px 24px 26px;
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.85rem;
}

/* ----------------------------------------------------------- 响应式 --- */
@media (max-width: 1024px) {
  .grid-tools,
  .grid-cards,
  .grid-3,
  .related-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero h1 {
    font-size: 2.7rem;
  }

  .hero-sub {
    font-size: 1.45rem;
  }
}

@media (max-width: 860px) {
  .cta-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
  }

  .cta-qr {
    text-align: left;
  }

  .qr-placeholder,
  .qr-img {
    margin-left: 0;
  }

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

@media (max-width: 768px) {
  body {
    font-size: 16.5px;
  }

  .container {
    padding: 0 18px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px 18px 18px;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    display: none;
  }

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

  .nav-link {
    padding: 12px 14px;
    border-radius: var(--radius-sm);
  }

  .grid-2,
  .grid-3,
  .grid-cards,
  .grid-tools,
  .related-grid,
  .follow-block {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding: 56px 0 48px;
  }

  .hero h1 {
    font-size: 2.15rem;
  }

  .hero-sub {
    font-size: 1.22rem;
  }

  .hero-stats {
    gap: 22px;
  }

  .section {
    padding: 48px 0;
  }

  .post-header h1 {
    font-size: 1.65rem;
  }

  .post .prose {
    padding-top: 34px;
  }

  .prose {
    font-size: 1.02rem;
  }

  .prose h2 {
    font-size: 1.32rem;
  }

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

  .cta-copy h2 {
    font-size: 1.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}