:root {
  --brand: #ff6fa5;
  --brand-dark: #e8508c;
  --brand-light: #ffb3d1;
  --brand-soft: #ffe3ee;
  --accent: #8b5cf6;
  --accent-2: #38bdf8;
  --bg: #fff7fb;
  --bg-alt: #ffffff;
  --bg-elev: rgba(255, 255, 255, 0.72);
  --text: #2b1b2e;
  --text-soft: #6d5a70;
  --text-mute: #9a8b9e;
  --border: rgba(255, 111, 165, 0.18);
  --border-strong: rgba(255, 111, 165, 0.35);
  --shadow-sm: 0 2px 8px rgba(180, 60, 110, 0.08);
  --shadow: 0 10px 30px rgba(180, 60, 110, 0.12);
  --shadow-lg: 0 24px 60px rgba(180, 60, 110, 0.18);
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 26px;
  --radius-pill: 999px;
  --header-h: 72px;
  --container: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 0.35s var(--ease);
  --grad-hero: linear-gradient(135deg, #ffe3ee 0%, #ffd0e6 35%, #e9d5ff 70%, #d6ecff 100%);
  --grad-brand: linear-gradient(135deg, #ff6fa5 0%, #ff8fbd 50%, #b98cff 100%);
  --grad-text: linear-gradient(120deg, #ff6fa5 0%, #b98cff 60%, #38bdf8 100%);
}

html[data-theme="dark"] {
  --bg: #140d18;
  --bg-alt: #1c1221;
  --bg-elev: rgba(38, 24, 44, 0.66);
  --text: #f4e9f6;
  --text-soft: #c9b6ce;
  --text-mute: #93809a;
  --border: rgba(255, 111, 165, 0.22);
  --border-strong: rgba(255, 111, 165, 0.45);
  --brand-soft: rgba(255, 111, 165, 0.14);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.55);
  --grad-hero: linear-gradient(135deg, #2a1330 0%, #3a1a3f 35%, #241640 70%, #14243a 100%);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --bg: #140d18;
    --bg-alt: #1c1221;
    --bg-elev: rgba(38, 24, 44, 0.66);
    --text: #f4e9f6;
    --text-soft: #c9b6ce;
    --text-mute: #93809a;
    --border: rgba(255, 111, 165, 0.22);
    --border-strong: rgba(255, 111, 165, 0.45);
    --brand-soft: rgba(255, 111, 165, 0.14);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.55);
    --grad-hero: linear-gradient(135deg, #2a1330 0%, #3a1a3f 35%, #241640 70%, #14243a 100%);
  }
}

*,
*::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: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  background-image: radial-gradient(circle at 12% 8%, rgba(255, 111, 165, 0.10), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(139, 92, 246, 0.10), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(56, 189, 248, 0.08), transparent 45%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
}

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

a {
  color: var(--brand-dark);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

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

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  margin: 0 0 0.6em;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

h1 {
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
}

h2 {
  font-size: clamp(1.4rem, 2.4vw, 1.95rem);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: var(--radius-pill);
  background: var(--grad-brand);
  box-shadow: 0 0 14px rgba(255, 111, 165, 0.55);
}

h3 {
  font-size: clamp(1.1rem, 1.7vw, 1.3rem);
  color: var(--text);
}

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

ul,
ol {
  margin: 0 0 1.1em;
  padding-left: 1.35em;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.4em;
}

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

blockquote {
  margin: 1.2em 0;
  padding: 1em 1.3em;
  border-left: 4px solid var(--brand);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
}

blockquote p {
  margin-bottom: 0.5em;
  color: var(--text-soft);
  font-style: italic;
}

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

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

:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection {
  background: var(--brand);
  color: #fff;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--brand-light);
  border-radius: var(--radius-pill);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brand);
}

/* ============ 头部 ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-elev);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: background 0.4s ease, box-shadow 0.4s ease;
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.brand a {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
}

.brand svg {
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(255, 111, 165, 0.45);
  transition: transform var(--transition), box-shadow var(--transition);
}

.brand a:hover svg {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: 0 10px 26px rgba(255, 111, 165, 0.6);
}

.brand-name {
  font-size: 1.22rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  white-space: nowrap;
}

#main-nav {
  flex: 1 1 auto;
}

#main-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

#main-nav a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-soft);
  border-radius: var(--radius-pill);
  position: relative;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

#main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-brand);
  transform: translateX(-50%);
  transition: width var(--transition);
}

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

#main-nav a:hover::after {
  width: 60%;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

#site-search {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

#site-search:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 4px rgba(255, 111, 165, 0.16);
}

#search-input {
  border: none;
  outline: none;
  background: transparent;
  padding: 9px 14px;
  font-size: 0.88rem;
  color: var(--text);
  width: 210px;
  min-width: 0;
  font-family: inherit;
}

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

#site-search button {
  border: none;
  cursor: pointer;
  padding: 9px 16px;
  font-size: 0.88rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-brand);
  font-family: inherit;
  transition: filter var(--transition);
}

#site-search button:hover {
  filter: brightness(1.08);
}

#theme-toggle,
#menu-toggle {
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text-soft);
  font-size: 0.84rem;
  font-weight: 600;
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  font-family: inherit;
  white-space: nowrap;
  transition: all var(--transition);
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: var(--brand-dark);
  border-color: var(--brand);
  background: var(--brand-soft);
  transform: translateY(-1px);
}

#menu-toggle {
  display: none;
}

/* ============ 主容器 ============ */
main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px 40px;
}

main > section {
  margin: 30px 0;
  padding: clamp(20px, 3.4vw, 40px);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  animation: fadeUp 0.7s var(--ease) both;
}

main > section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 0, rgba(255, 111, 165, 0.07), transparent 40%);
  pointer-events: none;
}

main > section > * {
  position: relative;
}

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

/* ============ Hero ============ */
#hero {
  margin-top: 26px;
  padding: 0;
  border: none;
  background: transparent;
  box-shadow: none;
}

#hero::before {
  display: none;
}

.hero-inner {
  position: relative;
  padding: clamp(28px, 4.6vw, 60px);
  border-radius: var(--radius-lg);
  background: var(--grad-hero);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  isolation: isolate;
}

.hero-inner::before,
.hero-inner::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  z-index: -1;
  opacity: 0.6;
  animation: floatBlob 14s ease-in-out infinite alternate;
}

.hero-inner::before {
  width: 340px;
  height: 340px;
  top: -120px;
  right: -80px;
  background: rgba(255, 111, 165, 0.55);
}

.hero-inner::after {
  width: 300px;
  height: 300px;
  bottom: -140px;
  left: -60px;
  background: rgba(139, 92, 246, 0.45);
  animation-delay: -7s;
}

@keyframes floatBlob {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(30px, -24px) scale(1.12);
  }
}

#hero-title {
  text-shadow: 0 2px 18px rgba(255, 255, 255, 0.35);
}

.hero-lead {
  max-width: 860px;
  font-size: clamp(0.95rem, 1.3vw, 1.06rem);
  color: var(--text-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 26px 0 30px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.96rem;
  letter-spacing: 0.01em;
  transition: transform var(--transition), box-shadow var(--transition),
    background var(--transition), color var(--transition);
}

.btn-primary {
  color: #fff;
  background: var(--grad-brand);
  box-shadow: 0 12px 28px rgba(255, 111, 165, 0.42);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 18px 40px rgba(255, 111, 165, 0.58);
}

.btn-secondary {
  color: var(--brand-dark);
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.btn-secondary:hover {
  color: #fff;
  background: var(--brand);
  border-color: var(--brand);
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(255, 111, 165, 0.42);
}

.hero-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero-figure:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.hero-figure svg {
  width: 100%;
  height: auto;
}

.hero-figure figcaption {
  padding: 12px 18px;
  font-size: 0.86rem;
  color: var(--text-mute);
  text-align: center;
  border-top: 1px solid var(--border);
}

/* ============ 面包屑 ============ */
#breadcrumb {
  margin: 18px 0 0;
  padding: 0 4px;
}

#breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--text-mute);
}

#breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--text-mute);
  opacity: 0.6;
}

#breadcrumb a {
  color: var(--text-soft);
  font-weight: 600;
}

#breadcrumb a:hover {
  color: var(--brand-dark);
}

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

/* ============ 文章卡片 ============ */
#articles article {
  position: relative;
  padding: 22px 24px;
  margin-bottom: 18px;
  border-radius: var(--radius);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

#articles article::after {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 4px;
  border-radius: var(--radius-pill);
  background: var(--grad-brand);
  opacity: 0;
  transform: scaleY(0.4);
  transform-origin: center;
  transition: opacity var(--transition), transform var(--transition);
}

#articles article:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}

#articles article:hover::after {
  opacity: 1;
  transform: scaleY(1);
}

#articles article h3 {
  margin-bottom: 0.35em;
  transition: color var(--transition);
}

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

#articles article p:first-of-type {
  font-size: 0.82rem;
  color: var(--text-mute);
  margin-bottom: 0.6em;
  letter-spacing: 0.02em;
}

#articles article a {
  display: inline-block;
  margin-top: 6px;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--brand-dark);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--brand-soft);
  transition: all var(--transition);
}

#articles article a:hover {
  color: #fff;
  background: var(--grad-brand);
  transform: translateX(4px);
}

/* ============ 新闻中心 ============ */
#news ul {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 12px;
}

#news li {
  padding: 16px 20px;
  border-radius: var(--radius);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 0.94rem;
  color: var(--text-soft);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

#news li:hover {
  transform: translateX(6px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

/* ============ 客户案例 ============ */
#cases blockquote {
  background: linear-gradient(135deg, var(--brand-soft), rgba(139, 92, 246, 0.08));
}

/* ============ FAQ ============ */
#faq details {
  margin-bottom: 12px;
  padding: 0;
  border-radius: var(--radius);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition),
    transform var(--transition);
}

#faq details:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

#faq details[open] {
  border-color: var(--brand);
  box-shadow: var(--shadow);
}

#faq summary {
  cursor: pointer;
  padding: 16px 52px 16px 20px;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text);
  position: relative;
  list-style: none;
  transition: color var(--transition), background var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  line-height: 24px;
  text-align: center;
  border-radius: 50%;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--brand-dark);
  background: var(--brand-soft);
  transition: transform var(--transition), background var(--transition),
    color var(--transition);
}

#faq details[open] summary {
  color: var(--brand-dark);
  background: var(--brand-soft);
}

#faq details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
  color: #fff;
  background: var(--grad-brand);
}

#faq details p {
  margin: 0;
  padding: 4px 20px 18px;
  font-size: 0.94rem;
  animation: fadeUp 0.4s var(--ease) both;
}

/* ============ 使用教程 ============ */
#howto ol {
  counter-reset: howto;
  list-style: none;
  padding-left: 0;
}

#howto ol li {
  counter-increment: howto;
  position: relative;
  padding: 12px 16px 12px 54px;
  margin-bottom: 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  transition: background var(--transition), transform var(--transition);
}

#howto ol li::before {
  content: counter(howto);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 800;
  color: #fff;
  background: var(--grad-brand);
  box-shadow: 0 4px 12px rgba(255, 111, 165, 0.4);
}

#howto ol li:hover {
  background: var(--brand-soft);
  transform: translateX(4px);
}

/* ============ 联系我们 ============ */
#contact ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}

#contact li {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  font-size: 0.92rem;
  color: var(--text-soft);
  transition: border-color var(--transition), transform var(--transition);
}

#contact li:hover {
  border-color: var(--brand);
  transform: translateY(-2px);
}

/* ============ 网站地图 & 友情链接 ============ */
#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#sitemap li,
#links li {
  margin: 0;
}

#sitemap a,
#links a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text-soft);
  transition: all var(--transition);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: var(--grad-brand);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 111, 165, 0.4);
}

/* ============ 页脚 ============ */
#site-footer {
  margin-top: 40px;
  padding: 40px 20px 32px;
  background: linear-gradient(180deg, transparent, var(--brand-soft));
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  text-align: center;
}

.footer-inner p {
  margin: 0 0 8px;
  font-size: 0.88rem;
  color: var(--text-mute);
}

.footer-inner p:first-child {
  font-weight: 700;
  color: var(--text-soft);
}

.footer-inner a {
  color: var(--brand-dark);
  font-weight: 600;
}

.footer-inner a:hover {
  color: var(--brand);
}

/* ============ 返回顶部 ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  z-index: 90;
  cursor: pointer;
  border: none;
  padding: 12px 18px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 700;
  font-family: inherit;
  color: #fff;
  background: var(--grad-brand);
  box-shadow: 0 12px 28px rgba(255, 111, 165, 0.48);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.94);
  transition: opacity var(--transition), transform var(--transition),
    visibility var(--transition), box-shadow var(--transition);
}

#back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 18px 38px rgba(255, 111, 165, 0.62);
}

/* ============ 滚动入场动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}

.reveal.is-visible {
  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;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  #search-input {
    width: 170px;
  }
  #main-nav a {
    padding: 7px 9px;
    font-size: 0.86rem;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 64px;
  }

  .header-inner {
    gap: 10px;
    padding: 10px 16px;
  }

  #menu-toggle {
    display: inline-block;
  }

  #main-nav {
    order: 3;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s var(--ease);
  }

  #main-nav.is-open {
    max-height: 640px;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 2px;
    padding: 8px 0 4px;
  }

  #main-nav a {
    display: block;
    padding: 11px 14px;
    font-size: 0.94rem;
    border-radius: var(--radius-sm);
  }

  #main-nav a::after {
    display: none;
  }

  #site-search {
    order: 4;
    flex-basis: 100%;
    margin-top: 8px;
  }

  #search-input {
    width: 100%;
    flex: 1;
  }

  .header-tools {
    gap: 6px;
  }

  main {
    padding: 0 14px 30px;
  }

  main > section {
    border-radius: var(--radius);
    margin: 22px 0;
  }

  #articles article {
    padding: 18px 18px 18px 22px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

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

  .brand svg {
    width: 34px;
    height: 34px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    text-align: center;
  }

  #contact ul {
    grid-template-columns: 1fr;
  }

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 5px;
  }

  #back-to-top {
    right: 14px;
    bottom: 16px;
    padding: 10px 14px;
    font-size: 0.8rem;
  }

  #faq summary {
    padding: 14px 48px 14px 16px;
    font-size: 0.93rem;
  }

  #faq details p {
    padding: 2px 16px 16px;
  }
}

@media (max-width: 380px) {
  .header-tools {
    flex-wrap: wrap;
  }
  #theme-toggle,
  #menu-toggle {
    padding: 8px 10px;
    font-size: 0.78rem;
  }
}

@media print {
  #site-header,
  #back-to-top,
  .hero-actions,
  #site-search,
  #theme-toggle,
  #menu-toggle {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  main > section {
    box-shadow: none;
    border: 1px solid #ddd;
    page-break-inside: avoid;
  }
}