*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --surface-2: #eef2f8;
  --text: #1a2634;
  --text-2: #3e4c5e;
  --text-3: #6b7a8d;
  --accent: #0b5cff;
  --accent-2: #7b2ff7;
  --accent-3: #ff3d71;
  --border: #dce3ec;
  --shadow: 0 4px 24px rgba(10, 30, 60, 0.08);
  --radius: 14px;
  --radius-sm: 8px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
[data-theme="dark"] {
  --bg: #0b1120;
  --surface: #131c2e;
  --surface-2: #1a263c;
  --text: #e8eef6;
  --text-2: #b0c0d4;
  --text-3: #7a8da3;
  --accent: #4d8dff;
  --accent-2: #a06bff;
  --accent-3: #ff5c8a;
  --border: #253248;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-2); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 20px; }

.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
  transition: background var(--transition), border var(--transition), box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow); }
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.15rem; color: var(--text); letter-spacing: -0.02em; }
.brand svg { width: 34px; height: 34px; flex-shrink: 0; }
.brand span { background: linear-gradient(120deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu a {
  padding: 8px 14px; border-radius: var(--radius-sm);
  font-size: 0.92rem; font-weight: 500; color: var(--text-2);
  transition: background var(--transition), color var(--transition);
}
.nav-menu a:hover { background: var(--surface-2); color: var(--accent); }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 40px; height: 40px; display: grid; place-items: center;
  border-radius: var(--radius-sm); color: var(--text-2);
  transition: background var(--transition), color var(--transition);
}
.icon-btn:hover { background: var(--surface-2); color: var(--accent); }
.icon-btn svg { width: 20px; height: 20px; }
.mobile-toggle { display: none; }

.search-panel {
  display: none; position: absolute; top: 100%; left: 0; right: 0;
  background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 16px 0; box-shadow: var(--shadow);
}
.search-panel.open { display: block; }
.search-form { display: flex; gap: 10px; max-width: 640px; margin: 0 auto; padding: 0 20px; }
.search-form input {
  flex: 1; padding: 12px 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--surface-2);
  color: var(--text); font-size: 0.95rem; outline: none;
  transition: border var(--transition), box-shadow var(--transition);
}
.search-form input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(11, 92, 255, 0.15); }
.search-form button {
  padding: 12px 24px; border-radius: var(--radius-sm);
  background: var(--accent); color: #fff; font-weight: 600; font-size: 0.95rem;
  transition: background var(--transition), transform var(--transition);
}
.search-form button:hover { background: var(--accent-2); transform: translateY(-1px); }

.mobile-nav {
  display: none; position: fixed; top: 64px; left: 0; right: 0; bottom: 0;
  background: var(--surface); z-index: 999; padding: 20px;
  flex-direction: column; gap: 6px; overflow-y: auto;
  border-top: 1px solid var(--border);
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  padding: 14px 16px; border-radius: var(--radius-sm);
  font-size: 1rem; font-weight: 500; color: var(--text-2);
  transition: background var(--transition);
}
.mobile-nav a:hover { background: var(--surface-2); color: var(--accent); }

.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #0b1a2f 0%, #122a4a 40%, #1a0b3a 100%);
  min-height: 460px; display: flex; align-items: center;
}
.hero-slides { position: relative; width: 100%; }
.hero-slide {
  display: none; padding: 80px 0 70px;
  animation: fadeSlide 0.6s ease;
}
.hero-slide.active { display: block; }
@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-content { max-width: 720px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 100px;
  background: rgba(255, 255, 255, 0.12); color: #b8d0ff;
  font-size: 0.82rem; font-weight: 600; letter-spacing: 0.04em;
  border: 1px solid rgba(255, 255, 255, 0.15); margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(1.8rem, 4.5vw, 3rem); font-weight: 800;
  color: #fff; line-height: 1.25; letter-spacing: -0.03em; margin-bottom: 18px;
}
.hero h1 em { font-style: normal; background: linear-gradient(110deg, #6ea8ff, #b388ff, #ff6b9d); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { color: #b0c4de; font-size: 1.05rem; max-width: 600px; margin-bottom: 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.btn-primary { background: linear-gradient(120deg, var(--accent), var(--accent-2)); color: #fff; box-shadow: 0 6px 20px rgba(11, 92, 255, 0.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(11, 92, 255, 0.45); color: #fff; }
.btn-ghost { background: rgba(255, 255, 255, 0.1); color: #dce8ff; border: 1px solid rgba(255, 255, 255, 0.2); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.18); color: #fff; transform: translateY(-2px); }
.hero-dots {
  position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 8px; z-index: 5;
}
.hero-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.3); cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.hero-dot.active { background: #fff; transform: scale(1.25); }

.stats-bar {
  background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 28px 0;
}
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center;
}
.stat-item .stat-num {
  font-size: 2rem; font-weight: 800; letter-spacing: -0.03em;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-item .stat-label { font-size: 0.85rem; color: var(--text-3); margin-top: 4px; }

.section { padding: 72px 0; }
.section-alt { background: var(--surface); }
.section-head { max-width: 720px; margin-bottom: 44px; }
.section-head h2 {
  font-size: clamp(1.5rem, 3.2vw, 2.1rem); font-weight: 800;
  letter-spacing: -0.03em; line-height: 1.3; margin-bottom: 12px;
}
.section-head p { color: var(--text-2); font-size: 1rem; }
.section-tag {
  display: inline-block; font-size: 0.78rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px;
}

.card-grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px 24px;
  transition: transform var(--transition), box-shadow var(--transition), border var(--transition);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.card-icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: grid; place-items: center; margin-bottom: 18px;
  background: linear-gradient(135deg, rgba(11, 92, 255, 0.12), rgba(123, 47, 247, 0.12));
}
.card-icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; letter-spacing: -0.01em; }
.card p { font-size: 0.92rem; color: var(--text-2); line-height: 1.65; }

.article-list { display: grid; gap: 20px; }
.article-item {
  display: grid; grid-template-columns: 1fr auto; gap: 20px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px 28px;
  transition: transform var(--transition), box-shadow var(--transition), border var(--transition);
}
.article-item:hover { transform: translateX(4px); box-shadow: var(--shadow); border-color: transparent; }
.article-item h3 { font-size: 1.08rem; font-weight: 700; margin-bottom: 8px; }
.article-item h3 a { color: var(--text); }
.article-item h3 a:hover { color: var(--accent); }
.article-meta {
  display: flex; flex-wrap: wrap; gap: 14px; font-size: 0.8rem;
  color: var(--text-3); margin-bottom: 10px;
}
.article-meta span { display: inline-flex; align-items: center; gap: 4px; }
.article-summary { font-size: 0.92rem; color: var(--text-2); line-height: 1.65; }
.article-cta {
  display: flex; align-items: center; font-size: 0.88rem; font-weight: 600;
  color: var(--accent); white-space: nowrap; gap: 4px;
}
.article-cta svg { width: 16px; height: 16px; }

.faq-list { max-width: 820px; margin: 0 auto; display: grid; gap: 12px; }
.faq-item {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); overflow: hidden;
  transition: border var(--transition);
}
.faq-item.open { border-color: var(--accent); }
.faq-question {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 18px 22px; text-align: left;
  font-size: 0.98rem; font-weight: 600; color: var(--text);
  transition: background var(--transition);
}
.faq-question:hover { background: var(--surface-2); }
.faq-chevron {
  width: 20px; height: 20px; flex-shrink: 0;
  transition: transform var(--transition); color: var(--text-3);
}
.faq-item.open .faq-chevron { transform: rotate(180deg); color: var(--accent); }
.faq-answer {
  max-height: 0; overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}
.faq-item.open .faq-answer { max-height: 600px; }
.faq-answer-inner {
  padding: 0 22px 20px; font-size: 0.92rem; color: var(--text-2); line-height: 1.75;
}

.howto-steps { display: grid; gap: 18px; counter-reset: step; }
.howto-step {
  display: grid; grid-template-columns: 52px 1fr; gap: 18px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  transition: box-shadow var(--transition);
}
.howto-step:hover { box-shadow: var(--shadow); }
.howto-num {
  width: 52px; height: 52px; border-radius: 12px;
  display: grid; place-items: center;
  font-size: 1.2rem; font-weight: 800; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.howto-step h3 { font-size: 1.02rem; font-weight: 700; margin-bottom: 6px; }
.howto-step p { font-size: 0.9rem; color: var(--text-2); line-height: 1.7; }

.case-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.case-quote {
  font-size: 0.95rem; color: var(--text-2); line-height: 1.75;
  font-style: italic; margin-bottom: 18px;
  padding-left: 16px; border-left: 3px solid var(--accent);
}
.case-author { display: flex; align-items: center; gap: 12px; }
.case-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700; color: #fff;
  font-size: 0.9rem; flex-shrink: 0;
}
.case-name { font-weight: 700; font-size: 0.92rem; }
.case-role { font-size: 0.8rem; color: var(--text-3); }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.contact-info { display: grid; gap: 18px; }
.contact-item {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 18px 20px;
}
.contact-item svg { width: 22px; height: 22px; flex-shrink: 0; color: var(--accent); margin-top: 2px; }
.contact-item h4 { font-size: 0.92rem; font-weight: 700; margin-bottom: 4px; }
.contact-item p { font-size: 0.88rem; color: var(--text-2); }
.contact-map {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; min-height: 300px;
  display: grid; place-items: center; padding: 24px;
}

.site-footer {
  background: var(--surface); border-top: 1px solid var(--border);
  padding: 56px 0 28px; margin-top: 0;
}
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 36px;
  margin-bottom: 40px;
}
.footer-brand p { font-size: 0.88rem; color: var(--text-2); margin-top: 12px; line-height: 1.7; }
.footer-col h4 { font-size: 0.9rem; font-weight: 700; margin-bottom: 16px; }
.footer-col ul { display: grid; gap: 10px; }
.footer-col a { font-size: 0.86rem; color: var(--text-2); }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 24px;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px;
  font-size: 0.8rem; color: var(--text-3);
}
.footer-bottom a { color: var(--text-3); }
.footer-bottom a:hover { color: var(--accent); }

.back-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 900;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--accent); color: #fff;
  display: grid; place-items: center;
  box-shadow: 0 6px 20px rgba(11, 92, 255, 0.4);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: all var(--transition);
}
.back-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--accent-2); transform: translateY(-3px); }
.back-top svg { width: 22px; height: 22px; }

.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

.breadcrumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  font-size: 0.82rem; color: var(--text-3); padding: 16px 0 0;
}
.breadcrumb a { color: var(--text-3); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { color: var(--text-2); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .nav-menu { display: none; }
  .mobile-toggle { display: grid; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .article-item { grid-template-columns: 1fr; }
  .article-cta { justify-self: start; }
}
@media (max-width: 600px) {
  .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero { min-height: 400px; }
  .hero-slide { padding: 56px 0 60px; }
  .section { padding: 52px 0; }
  .howto-step { grid-template-columns: 1fr; gap: 12px; }
  .howto-num { width: 44px; height: 44px; font-size: 1rem; }
}