:root {
  --color-primary: #1a3a5c;
  --color-primary-light: #2e6f9e;
  --color-accent: #f0b429;
  --color-accent-soft: rgba(240, 180, 41, 0.16);
  --color-bg: #f5f7fa;
  --color-bg-alt: #eef2f7;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.72);
  --color-text: #1d2733;
  --color-text-soft: #4a5968;
  --color-text-muted: #6b7a8a;
  --color-border: rgba(26, 58, 92, 0.12);
  --color-border-strong: rgba(26, 58, 92, 0.22);
  --color-footer-bg: #14283f;
  --color-footer-text: #c8d4e0;
  --shadow-sm: 0 2px 8px rgba(16, 34, 54, 0.06);
  --shadow-md: 0 8px 24px rgba(16, 34, 54, 0.1);
  --shadow-lg: 0 18px 48px rgba(16, 34, 54, 0.14);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --header-height: 76px;
  --container-max: 1200px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

html[data-theme="dark"] {
  --color-primary: #4d8fc4;
  --color-primary-light: #6aa9d8;
  --color-accent: #f5c451;
  --color-accent-soft: rgba(245, 196, 81, 0.14);
  --color-bg: #0e1822;
  --color-bg-alt: #121f2c;
  --color-surface: #172534;
  --color-surface-glass: rgba(23, 37, 52, 0.72);
  --color-text: #e6edf5;
  --color-text-soft: #b3c2d1;
  --color-text-muted: #8b9cad;
  --color-border: rgba(160, 190, 220, 0.16);
  --color-border-strong: rgba(160, 190, 220, 0.28);
  --color-footer-bg: #0a131c;
  --color-footer-text: #a9bacb;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

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

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

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

h1, h2, h3, h4 {
  margin: 0 0 0.6em;
  line-height: 1.32;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(1.7rem, 3.6vw, 2.6rem); }
h2 { font-size: clamp(1.4rem, 2.8vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); }
h4 { font-size: 1.05rem; }

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

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

li {
  margin-bottom: 0.5em;
  color: var(--color-text-soft);
}

dl {
  margin: 0;
}

dt {
  font-weight: 600;
  color: var(--color-text);
  margin-top: 0.8em;
}

dd {
  margin: 0.15em 0 0;
  color: var(--color-text-soft);
}

blockquote {
  margin: 0 0 1.2em;
  padding: 1em 1.4em;
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

blockquote p {
  margin: 0;
  color: var(--color-text);
}

time {
  color: var(--color-text-muted);
  font-size: 0.9em;
}

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

.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;
}

.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  z-index: 999;
  padding: 10px 20px;
  background: var(--color-accent);
  color: #14283f;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 12px;
  color: #14283f;
}

/* ============ 头部 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface-glass);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

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

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-logo svg {
  width: 40px;
  height: 40px;
  transition: transform var(--transition-base);
}

.brand:hover .brand-logo svg {
  transform: rotate(-6deg) scale(1.06);
}

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

.brand-text strong {
  font-size: 1.15rem;
  color: var(--color-text);
  letter-spacing: 0.04em;
}

.brand-text small {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

.main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

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

.main-nav li {
  margin: 0;
}

.main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text-soft);
  border-radius: var(--radius-pill);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.site-search {
  display: flex;
  align-items: center;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 4px 6px 4px 14px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-search:focus-within {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
}

.site-search input {
  width: 150px;
  border: none;
  background: transparent;
  color: var(--color-text);
  font-family: inherit;
  font-size: 0.88rem;
  padding: 6px 4px;
  outline: none;
}

.site-search input::placeholder {
  color: var(--color-text-muted);
}

.site-search button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.site-search button:hover {
  background: var(--color-accent);
  color: #14283f;
  transform: scale(1.06);
}

.theme-toggle,
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle:hover,
.menu-toggle:hover {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  transform: rotate(8deg);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 10px;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-menu {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 12px 24px 20px;
}

.mobile-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

.mobile-menu li {
  margin: 0;
}

.mobile-menu a {
  display: block;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-text-soft);
  font-weight: 500;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.mobile-menu a:hover {
  background: var(--color-accent-soft);
  color: var(--color-primary);
}

/* ============ 面包屑 ============ */
.breadcrumb {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 16px 24px 0;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.85rem;
}

.breadcrumb li {
  margin: 0;
  color: var(--color-text-muted);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--color-border-strong);
}

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

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

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

/* ============ 主容器 ============ */
main {
  display: block;
}

.section {
  padding: clamp(48px, 7vw, 88px) 0;
}

.section.alt {
  background: var(--color-bg-alt);
}

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

.section-lead {
  max-width: 780px;
  font-size: 1.02rem;
  color: var(--color-text-muted);
  margin-bottom: 2em;
}

/* ============ Hero ============ */
.hero {
  position: relative;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: clamp(24px, 4vw, 48px) 24px clamp(40px, 6vw, 72px);
}

.hero-slider {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, #1a3a5c 0%, #2e6f9e 55%, #4a2c5e 100%);
  min-height: 320px;
}

.slide {
  position: relative;
  display: none;
  opacity: 0;
  transition: opacity 0.6s ease;
}

.slide.active {
  display: block;
  opacity: 1;
  animation: slideFade 0.7s ease both;
}

@keyframes slideFade {
  from { opacity: 0; transform: scale(1.02); }
  to { opacity: 1; transform: scale(1); }
}

.slide-img {
  width: 100%;
  height: clamp(240px, 34vw, 420px);
  object-fit: cover;
}

.slide-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: clamp(20px, 4vw, 40px);
  background: linear-gradient(to top, rgba(10, 22, 36, 0.88) 0%, rgba(10, 22, 36, 0.45) 60%, transparent 100%);
  color: #fff;
}

.slide-caption h2 {
  color: #fff;
  margin-bottom: 0.4em;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.slide-caption p {
  margin: 0;
  color: rgba(255, 255, 255, 0.86);
  max-width: 720px;
}

.slider-controls {
  position: absolute;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 3;
}

.slider-prev,
.slider-next {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #fff;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.slider-prev:hover,
.slider-next:hover {
  background: var(--color-accent);
  color: #14283f;
  transform: scale(1.08);
}

.slider-dots {
  display: flex;
  gap: 6px;
}

.slider-dots button {
  width: 9px;
  height: 9px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
  cursor: pointer;
  transition: background var(--transition-fast), width var(--transition-fast);
}

.slider-dots button.active {
  width: 24px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

.hero-intro {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(24px, 4vw, 40px);
  background: var(--color-surface-glass);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.hero-intro h1 {
  background: linear-gradient(100deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--color-primary);
}

.hero-lead {
  font-size: 1.02rem;
  color: var(--color-text-soft);
  max-width: 900px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 28px 0;
}

.stat {
  padding: 18px 14px;
  text-align: center;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.stat-num {
  display: block;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 26px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(120deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

/* ============ 关于 ============ */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.about-text h3 {
  margin-top: 1.6em;
  padding-left: 14px;
  border-left: 4px solid var(--color-accent);
}

.about-text h3:first-child {
  margin-top: 0;
}

.timeline {
  list-style: none;
  padding: 0;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-primary-light));
  opacity: 0.5;
}

.timeline li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 14px;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 3px solid var(--color-accent);
}

.timeline strong {
  color: var(--color-primary);
}

.about-side {
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.info-card {
  padding: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.info-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.info-card h3 {
  margin-top: 0;
  font-size: 1.1rem;
}

.info-card p {
  margin-bottom: 0;
  font-size: 0.92rem;
}

/* ============ 产品卡片 ============ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 22px;
}

.card {
  position: relative;
  padding: 28px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}

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

.card-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 16px;
  transition: transform var(--transition-base);
}

.card:hover .card-icon {
  transform: scale(1.08) rotate(-4deg);
}

.card h3 {
  margin-bottom: 0.5em;
}

.card p {
  margin-bottom: 0;
  font-size: 0.94rem;
}

/* ============ 案例 ============ */
.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
  margin-bottom: 44px;
}

.case-card {
  padding: 26px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.case-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.case-card h3 {
  font-size: 1.08rem;
}

.case-card p {
  margin-bottom: 0;
  font-size: 0.94rem;
}

.testimonials h3 {
  margin-bottom: 1em;
}

.testimonials blockquote {
  position: relative;
  padding-left: 3em;
}

.testimonials blockquote::before {
  content: "\201C";
  position: absolute;
  left: 12px;
  top: -6px;
  font-size: 3rem;
  line-height: 1;
  color: var(--color-accent);
  font-family: Georgia, serif;
}

/* ============ 文章 ============ */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}

.article-thumb {
  width: 100%;
  height: 180px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.article-card:hover .article-thumb {
  transform: scale(1.04);
}

.article-body {
  padding: 20px 22px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.article-body h3 {
  font-size: 1.05rem;
  margin-bottom: 0.4em;
}

.article-body h3 a {
  color: var(--color-text);
}

.article-body h3 a:hover {
  color: var(--color-accent);
}

.article-meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.7em;
}

.article-summary {
  flex: 1;
  font-size: 0.92rem;
  margin-bottom: 1em;
}

.read-more {
  align-self: flex-start;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary-light);
  position: relative;
  padding-right: 18px;
}

.read-more::after {
  content: "\2192";
  position: absolute;
  right: 0;
  transition: transform var(--transition-fast);
}

.read-more:hover::after {
  transform: translateX(4px);
}

.article-full {
  padding: 28px clamp(20px, 4vw, 40px);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin-bottom: 22px;
  transition: box-shadow var(--transition-base);
}

.article-full:hover {
  box-shadow: var(--shadow-md);
}

.article-full h3 {
  padding-bottom: 0.5em;
  border-bottom: 2px solid var(--color-accent-soft);
}

.article-full p:last-child {
  margin-bottom: 0;
}

/* ============ HowTo ============ */
.howto-steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  display: grid;
  gap: 16px;
}

.howto-steps li {
  counter-increment: step;
  position: relative;
  padding: 22px 24px 22px 72px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.howto-steps li::before {
  content: counter(step);
  position: absolute;
  left: 20px;
  top: 22px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
}

.howto-steps li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.howto-steps h4 {
  margin: 0 0 0.4em;
  color: var(--color-primary);
}

.howto-steps p {
  margin: 0;
  font-size: 0.94rem;
}

/* ============ FAQ ============ */
.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.faq-item[open] {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.faq-item summary {
  position: relative;
  padding: 18px 52px 18px 22px;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform var(--transition-base);
}

.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-item summary:hover {
  background: var(--color-accent-soft);
}

.faq-answer {
  padding: 0 22px 20px;
  animation: faqOpen 0.35s ease both;
}

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

.faq-answer p {
  margin: 0;
  font-size: 0.94rem;
}

/* ============ 新闻 ============ */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.news-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin: 0;
  padding: 16px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

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

.news-list time {
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.news-list a {
  flex: 1;
  min-width: 200px;
  color: var(--color-text);
  font-weight: 500;
}

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

.news-tag {
  flex-shrink: 0;
  padding: 3px 12px;
  font-size: 0.76rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  color: var(--color-primary);
  font-weight: 600;
}

/* ============ 联系 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.contact-info {
  padding: 28px 26px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.contact-info h3 {
  margin-top: 0;
}

.contact-form-wrap {
  padding: 28px 26px;
  background: var(--color-surface-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.contact-form-wrap h3 {
  margin-top: 0;
}

.contact-form {
  display: grid;
  gap: 6px;
}

.contact-form label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text);
  margin-top: 8px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 11px 14px;
  font-family: inherit;
  font-size: 0.94rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.contact-form textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
  background: var(--color-surface);
}

.contact-form .btn {
  margin-top: 16px;
  justify-self: start;
}

/* ============ 网站地图 ============ */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 28px;
}

.sitemap-grid h3 {
  font-size: 1rem;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent-soft);
}

.sitemap-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sitemap-grid li {
  margin-bottom: 8px;
}

.sitemap-grid a {
  color: var(--color-text-soft);
  font-size: 0.94rem;
  position: relative;
  padding-left: 0;
  transition: padding-left var(--transition-fast), color var(--transition-fast);
}

.sitemap-grid a:hover {
  color: var(--color-accent);
  padding-left: 6px;
}

/* ============ 页脚 ============ */
.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: clamp(40px, 6vw, 64px) 0 0;
  margin-top: 0;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px clamp(32px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(28px, 4vw, 48px);
}

.site-footer h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 0.9em;
}

.site-footer p {
  color: var(--color-footer-text);
  font-size: 0.88rem;
  margin-bottom: 0.6em;
}

.site-footer a {
  color: var(--color-footer-text);
}

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

.footer-brand strong {
  display: block;
  font-size: 1.3rem;
  color: #fff;
  margin-bottom: 0.5em;
  letter-spacing: 0.04em;
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-legal h3:not(:first-child) {
  margin-top: 1.2em;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 20px 24px;
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  font-size: 0.82rem;
}

.footer-bottom p {
  margin: 0;
  color: rgba(200, 212, 224, 0.75);
}

/* ============ 返回顶部 ============ */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base), background var(--transition-fast);
}

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

.back-to-top:hover {
  background: var(--color-accent);
  color: #14283f;
  transform: translateY(-3px);
}

/* ============ 滚动动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .main-nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .header-inner {
    gap: 12px;
  }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .about-side {
    position: static;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }

  .footer-legal {
    grid-column: 1 / -1;
  }
}

@media (max-width: 860px) {
  .site-search {
    display: none;
  }

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

  .article-grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  }
}

@media (max-width: 640px) {
  :root {
    --header-height: 64px;
  }

  .header-inner {
    padding: 0 16px;
  }

  .brand-text small {
    display: none;
  }

  .brand-text strong {
    font-size: 1.02rem;
  }

  .section-inner,
  .breadcrumb,
  .hero {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-slider {
    border-radius: var(--radius-md);
  }

  .slide-caption {
    padding: 18px 16px;
  }

  .slide-caption h2 {
    font-size: 1.05rem;
  }

  .slide-caption p {
    font-size: 0.86rem;
  }

  .slider-controls {
    right: 12px;
    bottom: 12px;
    gap: 6px;
  }

  .slider-prev,
  .slider-next {
    width: 32px;
    height: 32px;
    font-size: 0.78rem;
  }

  .hero-intro {
    padding: 20px 18px;
  }

  .hero-stats {
    gap: 10px;
  }

  .stat {
    padding: 14px 8px;
  }

  .hero-cta .btn {
    flex: 1;
    min-width: 140px;
  }

  .card-grid,
  .case-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .howto-steps li {
    padding: 18px 18px 18px 62px;
  }

  .howto-steps li::before {
    left: 14px;
    top: 18px;
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
  }

  .news-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .news-list a {
    min-width: 0;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    padding-left: 16px;
    padding-right: 16px;
  }

  .footer-bottom {
    flex-direction: column;
    padding-left: 16px;
    padding-right: 16px;
  }

  .mobile-menu ul {
    grid-template-columns: 1fr;
  }

  .back-to-top {
    right: 14px;
    bottom: 14px;
    width: 42px;
    height: 42px;
  }

  .article-full {
    padding: 20px 18px;
  }
}

@media (max-width: 380px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }

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

/* ============ 动效降级 ============ */
@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;
  }
}

/* ============ 打印 ============ */
@media print {
  .site-header,
  .mobile-menu,
  .back-to-top,
  .slider-controls,
  .hero-cta,
  .contact-form-wrap,
  .site-footer .footer-links {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .section,
  .section.alt {
    background: #fff;
    padding: 16px 0;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  .article-card,
  .card,
  .faq-item,
  .info-card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
}