:root {
  --bg: #f5f7fb;
  --bg-strong: #e3edff;
  --card: #ffffff;
  --nav-bg: rgba(255, 255, 255, 0.95);
  --muted: #475569;
  --text: #0b3858;
  --accent: #2998ff;
  --accent-soft: rgba(41, 152, 255, 0.12);
  --accent-dark: #0054c7;
  --danger: #ef4444;
  --radius-pill: 999px;
  --radius-lg: 20px;
  --radius-xl: 26px;
  --shadow-soft: 0 24px 60px rgba(15, 23, 42, 0.08);
  --shadow-sm: 0 14px 35px rgba(15, 23, 42, 0.06);
  --container: 1400px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --border: rgba(11, 56, 88, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

ul,
ol {
  padding-left: 20px;
}


.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hc-hero {
  background: linear-gradient(135deg, var(--bg-strong) 0%, var(--bg) 100%);
  padding: 80px 0 60px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.hc-hero::before {
  content: '';
  position: absolute;
  top: -50px;
  left: -50px;
  width: 300px;
  height: 300px;
  background: var(--accent-soft);
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.6;
}

.hc-hero::after {
  content: '';
  position: absolute;
  bottom: -50px;
  right: -50px;
  width: 250px;
  height: 250px;
  background: #dbeafe;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.5;
}

.hc-badge {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
  border: 1px solid rgba(41, 152, 255, 0.2);
}

.hc-title {
  font-size: 42px;
  font-weight: 800;
  margin: 0;
  letter-spacing: -1px;
  color: var(--text);
}

.hc-sub {
  font-size: 18px;
  color: var(--muted);
  margin-top: 12px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hc-search-wrap {
  position: relative;
  max-width: 680px;
  margin: 40px auto 0;
  z-index: 10;
}

.hc-search {
  background: var(--card);
  display: flex;
  align-items: center;
  padding: 8px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.hc-search:focus-within {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px rgba(41, 152, 255, 0.15);
  border-color: var(--accent);
}

.hc-search i {
  font-size: 18px;
  color: var(--accent);
  margin-left: 16px;
}

.hc-search input {
  border: 0;
  outline: 0;
  width: 100%;
  padding: 16px;
  font-size: 16px;
  color: var(--text);
  background: transparent;
}

.hc-search input::placeholder {
  color: #94a3b8;
}

.hc-search button {
  background: var(--accent);
  color: white;
  border: 0;
  padding: 12px 28px;
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.hc-search button:hover {
  background: var(--accent-dark);
}

.hc-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  margin-top: 60px;
  padding-bottom: 80px;
}

.hc-sidebar {
  position: sticky;
  top: 40px;
  height: fit-content;
  background: var(--card);
  padding: 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 8px;
  padding-left: 12px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  font-weight: 500;
  font-size: 14px;
  color: var(--text);
  transition: var(--transition);
  cursor: pointer;
}

.nav-item:hover {
  background: var(--bg);
  color: var(--accent);
}

.nav-item.active {
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-weight: 600;
}

.nav-item i {
  width: 20px;
  text-align: center;
}

.section-header {
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
}

.section-header h2 {
  font-size: 26px;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-header i {
  color: var(--accent);
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.quick-card {
  background: var(--card);
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
  transition: var(--transition);
  cursor: pointer;
  text-align: center;
}

.quick-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-sm);
  border-color: var(--accent-soft);
}

.quick-card .icon-box {
  width: 50px;
  height: 50px;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin: 0 auto 16px;
}

.quick-card h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.quick-card p {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
}

.acc-group {
  margin-bottom: 50px;
  scroll-margin-top: 100px;
}

.accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.acc-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: var(--transition);
}

.acc-item:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(41, 152, 255, 0.08);
}

.acc-trigger {
  padding: 18px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: white;
  z-index: 2;
  position: relative;
}

.acc-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.acc-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  transition: var(--transition);
}

.acc-item:hover .acc-icon {
  background: var(--accent);
  color: white;
}

.acc-info h4 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}

.acc-info span {
  font-size: 13px;
  color: var(--muted);
}

.acc-chevron {
  color: #cbd5e1;
  transition: transform 0.3s ease;
}

.acc-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out;
  background: linear-gradient(to bottom, #ffffff, var(--bg));
}

.acc-content {
  padding: 20px 24px 30px;
  border-top: 1px dashed var(--border);
}

.acc-content h3 {
  font-size: 18px;
  color: var(--accent-dark);
  margin-top: 0;
}

.acc-content ul,
.acc-content ol {
  color: var(--muted);
  margin-bottom: 20px;
}

.acc-content li {
  margin-bottom: 8px;
}

.acc-content p {
  color: var(--muted);
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.tag.setup {
  background: #d1fae5;
  color: #047857;
}

.tag.trouble {
  background: #fee2e2;
  color: #b91c1c;
}

.tag.info {
  background: #e0f2fe;
  color: #0369a1;
}



@media (max-width: 992px) {
  .hc-layout {
    grid-template-columns: 1fr;
    margin-top: 30px;
  }

  .hc-sidebar {
    display: none;
  }

  .hc-title {
    font-size: 32px;
  }

  .quick-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .quick-grid {
    grid-template-columns: 1fr;
  }

  .acc-trigger {
    padding: 16px;
  }

  .acc-info span {
    display: none;
  }
}