:root {
  --color-bg: #f7f1ea;
  --color-bg-soft: #fdf8f3;
  --color-surface: rgba(255, 255, 255, 0.72);
  --color-surface-solid: #fffaf5;
  --color-text: #3a2a22;
  --color-text-soft: #6b5448;
  --color-muted: #98837a;
  --color-primary: #7a4a3a;
  --color-primary-soft: #a9755f;
  --color-accent: #d97a5a;
  --color-accent-soft: #f3d9c9;
  --color-border: rgba(122, 74, 58, 0.16);
  --color-shadow: rgba(90, 55, 42, 0.14);
  --gradient-banner: linear-gradient(135deg, #f7e7da 0%, #f3d9c9 38%, #e9c9b4 70%, #d9b8a3 100%);
  --gradient-primary: linear-gradient(135deg, #7a4a3a 0%, #a9755f 55%, #d97a5a 100%);
  --gradient-soft: linear-gradient(135deg, rgba(243, 217, 201, 0.55), rgba(233, 201, 180, 0.25));
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 999px;
  --header-h: 76px;
  --transition: 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", Georgia, serif;
  --maxw: 1180px;
  --blur: 16px;
}

/* 暗色模式（系统偏好） */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1412;
    --color-bg-soft: #221a17;
    --color-surface: rgba(46, 34, 29, 0.66);
    --color-surface-solid: #2a201c;
    --color-text: #f2e6de;
    --color-text-soft: #d3bdb1;
    --color-muted: #a58e83;
    --color-primary: #e0b49c;
    --color-primary-soft: #c99276;
    --color-accent: #e89170;
    --color-accent-soft: #4a332a;
    --color-border: rgba(224, 180, 156, 0.18);
    --color-shadow: rgba(0, 0, 0, 0.5);
    --gradient-banner: linear-gradient(135deg, #2a1d18 0%, #3a2822 40%, #4a332a 72%, #5c4034 100%);
    --gradient-primary: linear-gradient(135deg, #e0b49c 0%, #c99276 55%, #e89170 100%);
    --gradient-soft: linear-gradient(135deg, rgba(92, 64, 52, 0.55), rgba(58, 40, 34, 0.3));
  }
}

/* 手动暗色模式（按钮切换） */
html[data-theme="dark"] {
  --color-bg: #1a1412;
  --color-bg-soft: #221a17;
  --color-surface: rgba(46, 34, 29, 0.66);
  --color-surface-solid: #2a201c;
  --color-text: #f2e6de;
  --color-text-soft: #d3bdb1;
  --color-muted: #a58e83;
  --color-primary: #e0b49c;
  --color-primary-soft: #c99276;
  --color-accent: #e89170;
  --color-accent-soft: #4a332a;
  --color-border: rgba(224, 180, 156, 0.18);
  --color-shadow: rgba(0, 0, 0, 0.5);
  --gradient-banner: linear-gradient(135deg, #2a1d18 0%, #3a2822 40%, #4a332a 72%, #5c4034 100%);
  --gradient-primary: linear-gradient(135deg, #e0b49c 0%, #c99276 55%, #e89170 100%);
  --gradient-soft: linear-gradient(135deg, rgba(92, 64, 52, 0.55), rgba(58, 40, 34, 0.3));
  color-scheme: dark;
}

html[data-theme="light"] {
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(217, 122, 90, 0.08), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(122, 74, 58, 0.08), transparent 45%),
    radial-gradient(circle at 50% 92%, rgba(233, 201, 180, 0.18), transparent 50%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  line-height: 1.4;
  color: var(--color-text);
  margin: 0 0 0.6em;
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(1.6rem, 3.4vw, 2.4rem); }
h2 { font-size: clamp(1.35rem, 2.6vw, 1.9rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); }
h4 { font-size: 1.05rem; }

p {
  margin: 0 0 1em;
  color: var(--color-text-soft);
}

ul, ol {
  padding-left: 1.4em;
  margin: 0 0 1em;
}

li {
  margin-bottom: 0.4em;
  color: var(--color-text-soft);
}

blockquote {
  margin: 0 0 1.2em;
  padding: 1rem 1.4rem;
  border-left: 4px solid var(--color-accent);
  background: var(--gradient-soft);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-soft);
  font-style: italic;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

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

time {
  font-variant-numeric: tabular-nums;
  color: var(--color-muted);
  font-size: 0.9em;
}

address {
  font-style: normal;
}

summary {
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

::selection {
  background: var(--color-accent-soft);
  color: var(--color-text);
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--color-primary-soft);
  border-radius: var(--radius-pill);
  border: 2px solid var(--color-bg);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}

/* ===== 头部 ===== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  backdrop-filter: blur(var(--blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 6px 24px -12px var(--color-shadow);
  transition: background var(--transition), box-shadow var(--transition);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.7rem clamp(1rem, 3vw, 2rem);
  display: flex;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
  min-height: var(--header-h);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

.brand svg {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  box-shadow: 0 4px 14px -4px var(--color-shadow);
  transition: transform var(--transition);
}

.brand:hover svg {
  transform: rotate(-8deg) scale(1.05);
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.06em;
}

.brand-slogan {
  font-size: 0.72rem;
  color: var(--color-muted);
  letter-spacing: 0.12em;
  padding-left: 0.6rem;
  border-left: 1px solid var(--color-border);
  white-space: nowrap;
}

#main-nav {
  flex: 1 1 auto;
  min-width: 0;
}

#main-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
  margin: 0;
  padding: 0;
  justify-content: center;
}

#main-nav li {
  margin: 0;
}

#main-nav a {
  display: inline-block;
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  color: var(--color-text-soft);
  position: relative;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

#main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0.18rem;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: var(--radius-pill);
  transform: translateX(-50%);
  transition: width var(--transition);
}

#main-nav a:hover,
#main-nav a:focus-visible {
  color: var(--color-primary);
  background: var(--gradient-soft);
  transform: translateY(-1px);
}

#main-nav a:hover::after {
  width: 40%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

#site-search {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 0.18rem 0.18rem 0.18rem 0.85rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

#site-search:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(217, 122, 90, 0.18);
}

#search-input {
  border: none;
  background: transparent;
  color: var(--color-text);
  font-size: 0.85rem;
  padding: 0.35rem 0;
  width: 150px;
  outline: none;
  font-family: inherit;
}

#search-input::placeholder {
  color: var(--color-muted);
}

#site-search button,
#theme-toggle,
#menu-toggle {
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.82rem;
  border-radius: var(--radius-pill);
  padding: 0.42rem 0.9rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

#site-search button {
  background: var(--gradient-primary);
  color: #fff;
  font-weight: 600;
}

#theme-toggle,
#menu-toggle {
  background: var(--color-bg-soft);
  color: var(--color-text-soft);
  border: 1px solid var(--color-border);
}

#site-search button:hover,
#theme-toggle:hover,
#menu-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 18px -8px var(--color-shadow);
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-accent);
}

#menu-toggle {
  display: none;
}

/* ===== 主内容 ===== */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 2rem) 3rem;
}

/* 面包屑 */
.breadcrumb {
  padding: 1rem 0 0.4rem;
  font-size: 0.82rem;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  color: var(--color-muted);
}

.breadcrumb li {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--color-muted);
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--color-border);
}

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

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

.breadcrumb li[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 600;
}

/* ===== Banner ===== */
.banner {
  position: relative;
  margin: 1rem 0 2rem;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--gradient-banner);
  box-shadow: 0 24px 60px -28px var(--color-shadow);
  isolation: isolate;
}

.banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 82% 18%, rgba(255, 255, 255, 0.45), transparent 38%),
    radial-gradient(circle at 12% 88%, rgba(217, 122, 90, 0.25), transparent 42%);
  z-index: 0;
  pointer-events: none;
}

.banner-slide {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding: clamp(1.2rem, 3vw, 2.4rem);
  animation: bannerFade 0.7s ease both;
}

.banner-slide[hidden] {
  display: none;
}

.banner-slide svg {
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 40px -20px var(--color-shadow);
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: transform var(--transition), box-shadow var(--transition);
}

.banner-slide svg:hover {
  transform: scale(1.02) translateY(-3px);
  box-shadow: 0 26px 50px -22px var(--color-shadow);
}

.banner-text {
  order: -1;
}

.banner-text h2 {
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  letter-spacing: 0.04em;
}

.banner-text p {
  font-size: clamp(0.92rem, 1.6vw, 1.05rem);
  color: var(--color-text-soft);
  max-width: 34em;
}

.banner-text a {
  display: inline-block;
  margin-top: 0.4rem;
  padding: 0.6rem 1.5rem;
  border-radius: var(--radius-pill);
  background: var(--gradient-primary);
  color: #fff;
  font-weight: 600;
  font-size: 0.92rem;
  box-shadow: 0 12px 26px -12px rgba(122, 74, 58, 0.6);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.banner-text a:hover,
.banner-text a:focus-visible {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 18px 34px -14px rgba(122, 74, 58, 0.7);
  filter: brightness(1.06);
}

.banner-controls {
  position: absolute;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(0.8rem, 2vw, 1.4rem);
  z-index: 2;
  display: flex;
  gap: 0.5rem;
}

.banner-controls button {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

.banner-controls button:hover,
.banner-controls button:focus-visible {
  transform: scale(1.1);
  background: var(--gradient-primary);
  color: #fff;
}

@keyframes bannerFade {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 通用区块 ===== */
.section {
  position: relative;
  margin: 0 0 2rem;
  padding: clamp(1.3rem, 3vw, 2.4rem);
  background: var(--color-surface);
  backdrop-filter: blur(var(--blur)) saturate(150%);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 44px -30px var(--color-shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}

.section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0.55;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.6s ease;
}

.section:hover::before {
  transform: scaleX(1);
}

.section:hover {
  box-shadow: 0 26px 56px -30px var(--color-shadow);
  border-color: rgba(217, 122, 90, 0.28);
}

.section > h2 {
  position: relative;
  padding-bottom: 0.6rem;
  margin-bottom: 1.1rem;
}

.section > h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--gradient-primary);
}

.section > h3 {
  margin-top: 1.4rem;
  color: var(--color-primary);
}

.section > h3::before {
  content: "◇";
  margin-right: 0.4rem;
  color: var(--color-accent);
  font-size: 0.85em;
}

.lead {
  font-size: clamp(0.96rem, 1.7vw, 1.08rem);
  line-height: 2;
  color: var(--color-text);
}

/* 作者信息框 */
.author-box {
  margin-top: 1.6rem;
  padding: 1.1rem 1.3rem;
  border-radius: var(--radius-md);
  background: var(--gradient-soft);
  border: 1px dashed var(--color-border);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: transform var(--transition), box-shadow var(--transition);
}

.author-box:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 32px -22px var(--color-shadow);
}

.author-box h4 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.author-box p {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.author-box p:last-child {
  margin-bottom: 0;
}

/* ===== 产品列表 ===== */
#products ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

#products ul li {
  position: relative;
  padding: 0.9rem 1rem 0.9rem 2.4rem;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#products ul li::before {
  content: "✦";
  position: absolute;
  left: 0.95rem;
  top: 0.9rem;
  color: var(--color-accent);
  font-size: 0.9rem;
}

#products ul li:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: 0 16px 30px -20px var(--color-shadow);
}

/* ===== 新闻列表 ===== */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.news-list li {
  position: relative;
  padding: 0.8rem 1rem 0.8rem 1.6rem;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

.news-list li::before {
  content: "";
  position: absolute;
  left: 0.7rem;
  top: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gradient-primary);
  transform: translateY(-50%);
}

.news-list li:hover {
  transform: translateX(6px);
  border-color: var(--color-accent);
  background: var(--gradient-soft);
}

.news-list time {
  display: inline-block;
  margin-right: 0.6rem;
  padding: 0.05rem 0.55rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  color: var(--color-primary);
  font-size: 0.78rem;
  font-weight: 600;
}

/* ===== 文章卡片 ===== */
#articles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.1rem;
}

#articles > h2,
#articles > p {
  grid-column: 1 / -1;
}

#articles article {
  display: flex;
  flex-direction: column;
  padding: 1.2rem;
  background: var(--color-surface-solid);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 28px -22px var(--color-shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

#articles article::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-soft);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

#articles article:hover {
  transform: translateY(-6px);
  border-color: var(--color-accent);
  box-shadow: 0 24px 44px -24px var(--color-shadow);
}

#articles article:hover::after {
  opacity: 0.5;
}

#articles article > * {
  position: relative;
  z-index: 1;
}

#articles article h3 {
  margin-bottom: 0.4rem;
  font-size: 1.05rem;
  transition: color var(--transition);
}

#articles article:hover h3 {
  color: var(--color-accent);
}

#articles article p {
  font-size: 0.88rem;
  line-height: 1.8;
  flex: 1;
}

#articles article a {
  align-self: flex-start;
  margin-top: auto;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-pill);
  background: var(--gradient-soft);
  border: 1px solid var(--color-border);
  font-size: 0.82rem;
  font-weight: 600;
  transition: background var(--transition), color var(--transition), transform var(--transition), border-color var(--transition);
}

#articles article a:hover,
#articles article a:focus-visible {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  transform: translateX(3px);
}

/* ===== 教程步骤 ===== */
#howto ol {
  counter-reset: step;
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.7rem;
  margin: 1rem 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 0.85rem 1rem 0.85rem 3.2rem;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.7rem;
  height: 1.7rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  font-family: var(--font-sans);
  box-shadow: 0 6px 14px -8px rgba(122, 74, 58, 0.7);
}

#howto ol li:hover {
  transform: translateX(5px);
  border-color: var(--color-accent);
  box-shadow: 0 12px 26px -20px var(--color-shadow);
}

/* ===== FAQ ===== */
#faq details {
  margin-bottom: 0.7rem;
  padding: 0.9rem 1.1rem;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

#faq details:hover {
  border-color: var(--color-accent);
  box-shadow: 0 12px 26px -22px var(--color-shadow);
}

#faq details[open] {
  background: var(--gradient-soft);
  border-color: var(--color-accent);
}

#faq summary {
  font-weight: 600;
  color: var(--color-text);
  list-style: none;
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  transition: color var(--transition);
}

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

#faq summary::before {
  content: "+";
  flex-shrink: 0;
  width: 1.4rem;
  height: 1.4rem;
  margin-top: 0.18rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--color-accent-soft);
  color: var(--color-primary);
  font-size: 1rem;
  line-height: 1;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

#faq details[open] summary::before {
  content: "−";
  transform: rotate(180deg);
  background: var(--gradient-primary);
  color: #fff;
}

#faq summary:hover {
  color: var(--color-accent);
}

#faq details p {
  margin: 0.7rem 0 0;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--color-border);
  font-size: 0.9rem;
  animation: faqOpen 0.4s ease both;
}

@keyframes faqOpen {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 联系 ===== */
#contact address {
  padding: 1.1rem 1.3rem;
  background: var(--gradient-soft);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  margin-bottom: 1.2rem;
}

#contact address p {
  margin-bottom: 0.45rem;
  font-size: 0.92rem;
}

#contact address p:last-child {
  margin-bottom: 0;
}

#contact address a {
  font-weight: 600;
  border-bottom: 1px dashed var(--color-accent);
}

#contact ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

#contact ul li {
  margin: 0;
}

#contact ul a {
  display: inline-block;
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-pill);
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  font-size: 0.85rem;
  transition: background var(--transition), color var(--transition), transform var(--transition), border-color var(--transition);
}

#contact ul a:hover,
#contact ul a:focus-visible {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
}

/* ===== 页脚 ===== */
footer {
  margin-top: 1rem;
  background: var(--color-surface);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem clamp(1rem, 3vw, 2rem);
  font-size: 0.85rem;
  color: var(--color-muted);
}

.footer-inner p {
  margin-bottom: 0.6rem;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.footer-inner a {
  color: var(--color-text-soft);
  border-bottom: 1px dotted var(--color-border);
}

.footer-inner a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

#privacy,
#disclaimer {
  padding: 0.6rem 0.9rem;
  background: var(--color-bg-soft);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

/* ===== 返回顶部 ===== */
#back-to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 90;
  padding: 0.65rem 1.1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--color-primary);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 12px 28px -16px var(--color-shadow);
  transition: transform var(--transition), background var(--transition), color var(--transition), box-shadow var(--transition);
}

#back-to-top:hover,
#back-to-top:focus-visible {
  background: var(--gradient-primary);
  color: #fff;
  transform: translateY(-4px);
  box-shadow: 0 18px 34px -16px rgba(122, 74, 58, 0.6);
}

/* ===== 滚动进入动画 ===== */
.section,
.banner,
#articles article,
.news-list li,
#products ul li,
#howto ol li,
#faq details {
  animation: riseIn 0.8s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

@supports (animation-timeline: view()) {
  .section,
  #articles article,
  .news-list li,
  #products ul li,
  #howto ol li,
  #faq details {
    animation: riseIn linear both;
    animation-timeline: view();
    animation-range: entry 0% cover 26%;
  }
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .header-inner {
    gap: 0.8rem;
  }
  #main-nav ul {
    gap: 0;
  }
  #main-nav a {
    padding: 0.35rem 0.5rem;
    font-size: 0.84rem;
  }
  #search-input {
    width: 120px;
  }
}

@media (max-width: 860px) {
  .banner-slide {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .banner-slide svg {
    order: 2;
    max-height: 220px;
  }
  .banner-text {
    order: 1;
  }
  .banner-text p {
    margin-left: auto;
    margin-right: auto;
  }
  .banner-controls {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 64px;
  }
  .header-inner {
    flex-wrap: wrap;
    padding: 0.55rem 1rem;
    gap: 0.6rem;
  }
  .brand-slogan {
    display: none;
  }
  #menu-toggle {
    display: inline-block;
  }
  #main-nav {
    order: 5;
    flex-basis: 100%;
    display: none;
  }
  #main-nav.is-open {
    display: block;
    animation: navDrop 0.35s ease both;
  }
  #main-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: 0.4rem 0;
    border-top: 1px solid var(--color-border);
  }
  #main-nav a {
    display: block;
    padding: 0.6rem 0.8rem;
    border-radius: var(--radius-sm);
  }
  #main-nav a::after {
    display: none;
  }
  @keyframes navDrop {
    from {
      opacity: 0;
      transform: translateY(-8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  .header-actions {
    margin-left: auto;
  }
  #site-search {
    flex: 1 1 auto;
  }
  #search-input {
    width: 100%;
    min-width: 0;
  }
  #site-search button {
    padding: 0.42rem 0.7rem;
  }
  .section {
    padding: 1.1rem;
    border-radius: var(--radius-md);
  }
  .banner {
    border-radius: var(--radius-lg);
  }
  .banner-slide {
    padding: 1rem;
  }
  #articles {
    grid-template-columns: 1fr;
  }
  #products ul {
    grid-template-columns: 1fr;
  }
  #back-to-top {
    padding: 0.55rem 0.9rem;
    font-size: 0.78rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
  .header-actions {
    gap: 0.35rem;
  }
  #theme-toggle,
  #menu-toggle {
    padding: 0.42rem 0.65rem;
    font-size: 0.76rem;
  }
  #site-search {
    padding-left: 0.6rem;
  }
  #site-search button {
    font-size: 0.76rem;
  }
  .banner-text h2 {
    font-size: 1.3rem;
  }
  .banner-controls button {
    width: 30px;
    height: 30px;
  }
  blockquote {
    padding: 0.8rem 1rem;
  }
  #contact ul {
    flex-direction: column;
  }
  #contact ul a {
    display: block;
    text-align: center;
  }
}

/* 打印样式 */
@media print {
  #site-header,
  #back-to-top,
  .banner-controls,
  .header-actions {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .section,
  .banner {
    box-shadow: none;
    border: 1px solid #ccc;
    background: #fff;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}