:root {
  --gold: #e8b84b;
  --gold-l: #f5d688;
  --gold-d: #d49c28;
  --bg: #08080c;
  --bg2: rgba(18, 18, 26, 0.88);
  --bg3: rgba(24, 24, 36, 0.95);
  --t1: #f0ece4;
  --t2: rgba(240, 236, 228, 0.7);
  --t3: rgba(154, 150, 142, 0.8);
  --bd: rgba(232, 184, 75, 0.18);
  --bd2: rgba(232, 184, 75, 0.45);
  --glow: rgba(232, 184, 75, 0.12);
  --sidebar: 240px;
}

.tutorial-wrapper {
  font-family: 'Noto Sans SC', system-ui, sans-serif;
  background: var(--bg);
  color: var(--t1);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
.sidebar {
  position: fixed;
  top: 64px;
  left: 0;
  width: var(--sidebar);
  height: calc(100vh - 64px);
  background: rgba(10, 10, 16, 0.96);
  border-right: 1px solid var(--bd);
  z-index: 40; /* Lower than nav (50) to avoid overlap issues if any */
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.sidebar-logo {
  padding: 24px 20px 20px;
  font-weight: 700;
  color: var(--gold);
  font-size: 16px;
  letter-spacing: 1px;
  border-bottom: 1px solid var(--bd);
  flex-shrink: 0;
}
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 12px 0;
  scrollbar-width: thin;
  scrollbar-color: rgba(232, 184, 75, 0.2) transparent;
}
.sidebar-nav::-webkit-scrollbar {
  width: 3px;
}
.sidebar-nav::-webkit-scrollbar-thumb {
  background: rgba(232, 184, 75, 0.25);
  border-radius: 3px;
}
.nav-group {
  padding: 0 12px;
  margin-bottom: 2px;
}
.nav-group-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--t3);
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 12px 10px 6px;
  display: block;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--t2);
  font-size: 13px;
  font-weight: 400;
  transition: all 0.2s;
  cursor: pointer;
}
.nav-item:hover {
  background: rgba(232, 184, 75, 0.08);
  color: var(--t1);
}
.nav-item.active {
  background: rgba(232, 184, 75, 0.12);
  color: var(--gold);
  font-weight: 500;
}
.nav-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  border-radius: 6px;
  background: rgba(232, 184, 75, 0.12);
  color: var(--gold);
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
  padding: 0 5px;
}
.nav-item.active .nav-badge {
  background: var(--gold);
  color: var(--bg);
}
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 76px;
  left: 12px;
  z-index: 60;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--bg2);
  border: 1px solid var(--bd);
  color: var(--gold);
  font-size: 20px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 39;
}
.main {
  margin-left: var(--sidebar);
  min-height: 100vh;
}
.hero {
  text-align: center;
  padding: 56px 32px 40px;
  background: radial-gradient(ellipse 70% 50% at 50% 30%, rgba(232, 184, 75, 0.06) 0%, transparent 70%);
}
.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--gold-l), var(--gold), var(--gold-d));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  color: var(--t2);
  font-size: 0.95rem;
  margin-top: 10px;
  max-width: 540px;
  display: inline-block;
}
.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 32px 80px;
}
.step {
  margin-top: 52px;
  scroll-margin-top: 28px;
}
.step-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
}
.step-num {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--bg);
  background: var(--gold);
  padding: 3px 10px;
  border-radius: 6px;
  letter-spacing: 1px;
}
.step-title {
  font-size: 1.35rem;
  font-weight: 700;
}
.step-desc {
  color: var(--t2);
  font-size: 0.9rem;
  margin-bottom: 22px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--bd);
}
.func {
  margin-bottom: 18px;
  padding: 20px 22px;
  background: var(--bg2);
  border: 1px solid var(--bd);
  border-radius: 12px;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.func:hover {
  border-color: var(--bd2);
  box-shadow: 0 2px 20px var(--glow);
}
.func h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gold-l);
  margin-bottom: 7px;
}
.func p {
  color: var(--t2);
  font-size: 0.88rem;
  margin-bottom: 5px;
}
.func p:last-child {
  margin-bottom: 0;
}
.bl {
  list-style: none;
  padding: 0;
  margin: 6px 0 0;
}
.bl li {
  padding: 4px 0 4px 18px;
  position: relative;
  color: var(--t2);
  font-size: 0.86rem;
}
.bl li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
  opacity: 0.55;
}
.bl li strong {
  color: var(--t1);
  font-weight: 500;
}
.callout {
  margin: 10px 0 0;
  background: linear-gradient(135deg, rgba(232, 184, 75, 0.07), rgba(232, 184, 75, 0.02));
  border-left: 3px solid var(--gold);
  border-radius: 0 8px 8px 0;
  padding: 11px 15px;
}
.callout-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 3px;
}
.callout p {
  color: var(--t2);
  font-size: 0.84rem;
  margin: 0;
}
.tl {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}
.tl li {
  display: flex;
  gap: 12px;
  padding-bottom: 12px;
  position: relative;
}
.tl li:last-child {
  padding-bottom: 0;
}
.tl li:last-child .tl-line {
  display: none;
}
.tl-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  margin-top: 7px;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}
.tl-line {
  position: absolute;
  left: 4px;
  top: 20px;
  bottom: 0;
  width: 2px;
  background: rgba(232, 184, 75, 0.2);
}
.tl-body {
  flex: 1;
}
.tl-body h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gold-l);
  margin-bottom: 2px;
}
.tl-body p {
  font-size: 0.84rem;
  color: var(--t2);
  margin: 0;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 8px 0 0;
}
.tag {
  padding: 5px 11px;
  background: rgba(232, 184, 75, 0.05);
  border: 1px solid var(--bd);
  border-radius: 8px;
  font-size: 11.5px;
  color: var(--t1);
  font-weight: 500;
}
.tag small {
  display: block;
  color: var(--t3);
  font-size: 10.5px;
  font-weight: 400;
  margin-top: 1px;
}
.cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 12px;
}
.col-box {
  padding: 15px;
  border-radius: 10px;
  border: 1px solid var(--bd);
  background: var(--bg2);
}
.col-box h4 {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--gold-l);
  margin-bottom: 8px;
}
.footer {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--bd);
  margin-top: 36px;
}
.footer p {
  color: var(--t3);
  font-size: 0.8rem;
}
.footer a {
  color: var(--gold);
  text-decoration: none;
}

@media(max-width:900px) {
  :root {
    --sidebar: 220px;
  }
}
@media(max-width:768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s;
    width: 260px;
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .sidebar-overlay.open {
    display: block;
  }
  .sidebar-toggle {
    display: flex;
  }
  .main {
    margin-left: 0;
  }
  .wrap {
    padding: 0 20px 60px;
  }
  .hero {
    padding: 68px 20px 36px;
  }
  .cols {
    grid-template-columns: 1fr;
  }
}