*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --navy:#0d0d1f;--mid:#16103a;--alt:#0d1a2a;
  --cyan:#22d3ee;--cyan-deep:#06b6d4;--teal:#34d399;--purple:#a78bfa;--amber:#fbbf24;--pink:#ec4899;--red:#ef4444;
  --text:rgba(255,255,255,0.92);--text-dim:rgba(255,255,255,0.55);--text-muted:rgba(255,255,255,0.35);
  --glass:rgba(22,16,58,0.55);--border:rgba(34,211,238,0.12);
}
html{scroll-behavior:smooth}
body{
  font-family:'Plus Jakarta Sans',sans-serif;
  background:var(--navy);color:var(--text);
  line-height:1.6;-webkit-font-smoothing:antialiased;
}

/* Background */
.bg-orbs{position:fixed;inset:0;pointer-events:none;z-index:0;overflow:hidden}
.bg-orbs .orb{position:absolute;border-radius:50%;filter:blur(140px)}
.bg-orbs .o1{width:600px;height:600px;top:-200px;left:-100px;background:rgba(34,211,238,0.1)}
.bg-orbs .o2{width:500px;height:500px;bottom:0;right:-100px;background:rgba(167,139,250,0.08)}

/* Layout */
.wrapper{max-width:900px;margin:0 auto;padding:40px 24px 80px;position:relative;z-index:1}

/* Brand bar */
.brand-bar{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;gap:12px;padding:16px 28px;
  background:rgba(13,13,31,0.8);backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(34,211,238,0.06);
}
.brand-dot{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,#22d3ee,#06b6d4);box-shadow:0 0 12px rgba(34,211,238,0.6);flex-shrink:0}
.brand-name{font-size:15px;font-weight:700;color:#22d3ee}
.brand-name span{color:var(--text-muted);font-weight:400}
.brand-nav{margin-left:auto;display:flex;align-items:center;gap:12px}
.brand-nav a{font-size:13px;font-weight:600;color:var(--text-dim);text-decoration:none;padding:6px 14px;border-radius:8px;transition:all 0.2s}
.brand-nav a:hover{color:#fff;background:rgba(34,211,238,0.1)}

/* Cover */
.cover{text-align:center;padding:100px 0 40px}
.cover-logo{display:flex;align-items:center;justify-content:center;gap:14px;margin-bottom:16px}
.cover-logo .logo-icon{width:56px;height:56px;border-radius:14px;background:linear-gradient(135deg,#22d3ee,#06b6d4);display:flex;align-items:center;justify-content:center;font-size:28px}
.cover-logo h1{font-size:2.2rem;font-weight:900}
.cover-logo h1 .c1{color:var(--cyan)}
.cover-logo h1 .c2{color:var(--teal)}
.cover h2{font-size:1.6rem;font-weight:800;color:var(--cyan);margin-bottom:8px}
.cover p{color:var(--text-dim);font-size:1rem;max-width:540px;margin:0 auto}
.cover-url{display:inline-block;margin-top:16px;padding:8px 20px;background:rgba(34,211,238,0.1);border:1px solid rgba(34,211,238,0.2);border-radius:8px;font-size:0.85rem;color:var(--cyan);font-weight:600}

/* TOC */
.toc{
  background:rgba(22,16,58,0.5);border:1px solid var(--border);
  border-radius:16px;padding:28px 32px;margin:40px 0;
}
.toc h3{font-size:1.1rem;font-weight:800;color:var(--cyan);margin-bottom:16px}
.toc-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.toc-item{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--text-dim);font-size:0.85rem;font-weight:500;padding:8px 12px;border-radius:8px;transition:all 0.2s}
.toc-item:hover{background:rgba(34,211,238,0.08);color:var(--text)}
.toc-item i{color:var(--cyan);width:18px;text-align:center;font-size:0.8rem}
.toc-role{grid-column:1/-1;font-size:0.75rem;font-weight:700;letter-spacing:2px;text-transform:uppercase;padding:8px 0 0;margin-top:4px;border-top:1px solid rgba(255,255,255,0.06)}
.toc-role.getting-started{color:var(--amber)}
.toc-role.learning{color:var(--cyan)}
.toc-role.premium-section,.toc-role.pro-section{color:var(--pink)}
.toc-role.account{color:var(--teal)}

/* Section */
.section{margin:48px 0}
.section-header{
  display:flex;align-items:center;gap:12px;
  margin-bottom:24px;padding-bottom:12px;
  border-bottom:2px solid;
}
.section-header.getting-started{border-color:rgba(251,191,36,0.3)}
.section-header.learning{border-color:rgba(34,211,238,0.3)}
.section-header.premium-section,.section-header.pro-section{border-color:rgba(236,72,153,0.3)}
.section-header.account{border-color:rgba(52,211,153,0.3)}
.section-icon{
  width:44px;height:44px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-size:1.2rem;flex-shrink:0;
}
.section-icon.getting-started{background:rgba(251,191,36,0.15);color:var(--amber)}
.section-icon.learning{background:rgba(34,211,238,0.15);color:var(--cyan)}
.section-icon.premium-section,.section-icon.pro-section{background:rgba(236,72,153,0.15);color:var(--pink)}
.section-icon.account{background:rgba(52,211,153,0.15);color:var(--teal)}
.section-header h2{font-size:1.3rem;font-weight:800}
.section-header .role-tag{
  margin-left:auto;font-size:0.7rem;font-weight:700;
  letter-spacing:1px;text-transform:uppercase;
  padding:4px 12px;border-radius:6px;
}
.role-tag.free{background:rgba(52,211,153,0.15);color:var(--teal)}
.role-tag.pro{background:rgba(34,211,238,0.15);color:var(--cyan)}
.role-tag.premium{background:rgba(236,72,153,0.15);color:var(--pink)}
.role-tag.all{background:rgba(251,191,36,0.15);color:var(--amber)}

/* Cards */
.guide-card{
  background:rgba(22,16,58,0.4);border:1px solid var(--border);
  border-radius:14px;padding:24px;margin-bottom:16px;
}
.guide-card h3{font-size:1rem;font-weight:700;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.guide-card h3 i{font-size:0.85rem}
.guide-card p{color:var(--text-dim);font-size:0.9rem;margin-bottom:12px}
.guide-card p:last-child{margin-bottom:0}

/* Steps */
.steps{counter-reset:step}
.step{
  display:flex;gap:14px;margin-bottom:14px;
  padding:14px 16px;
  background:rgba(34,211,238,0.03);border:1px solid rgba(34,211,238,0.08);
  border-radius:10px;
}
.step:last-child{margin-bottom:0}
.step::before{
  counter-increment:step;content:counter(step);
  width:28px;height:28px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-size:0.8rem;font-weight:800;
  background:rgba(34,211,238,0.15);color:var(--cyan);
}
.step-content h4{font-size:0.9rem;font-weight:700;margin-bottom:2px}
.step-content p{color:var(--text-dim);font-size:0.83rem;margin:0}

/* Feature list */
.feat-list{list-style:none;display:flex;flex-direction:column;gap:8px}
.feat-list li{
  display:flex;align-items:flex-start;gap:10px;
  font-size:0.88rem;color:var(--text-dim);
}
.feat-list li i{color:var(--teal);margin-top:4px;font-size:0.75rem;flex-shrink:0}
.feat-list li strong{color:var(--text);font-weight:600}

/* Tip box */
.tip{
  display:flex;gap:12px;padding:14px 16px;
  border-radius:10px;margin-top:12px;
  font-size:0.83rem;
}
.tip.info{background:rgba(34,211,238,0.06);border:1px solid rgba(34,211,238,0.15);color:var(--cyan)}
.tip.warning{background:rgba(251,191,36,0.06);border:1px solid rgba(251,191,36,0.15);color:var(--amber)}
.tip.success{background:rgba(52,211,153,0.06);border:1px solid rgba(52,211,153,0.15);color:var(--teal)}
.tip i{margin-top:2px;flex-shrink:0}
.tip span{color:var(--text-dim)}
.tip span strong{color:var(--text);font-weight:600}

/* Nav path */
.nav-path{
  display:inline-flex;align-items:center;gap:6px;
  font-size:0.78rem;font-weight:600;
  background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.08);
  border-radius:6px;padding:4px 10px;margin-bottom:12px;
  color:var(--text-muted);
}
.nav-path i{font-size:0.65rem}
.nav-path span{color:var(--text-dim)}

/* Divider */
.role-divider{
  text-align:center;padding:32px 0;
  font-size:1.4rem;font-weight:900;
  letter-spacing:2px;
}
.role-divider.getting-started{color:var(--amber)}
.role-divider.learning{color:var(--cyan)}
.role-divider.premium-section,.role-divider.pro-section{color:var(--pink)}
.role-divider.account{color:var(--teal)}
.role-divider span{
  display:inline-block;padding:6px 24px;
  border-radius:10px;
}
.role-divider.getting-started span{background:rgba(251,191,36,0.08);border:1px solid rgba(251,191,36,0.2)}
.role-divider.learning span{background:rgba(34,211,238,0.08);border:1px solid rgba(34,211,238,0.2)}
.role-divider.premium-section span,.role-divider.pro-section span{background:rgba(236,72,153,0.08);border:1px solid rgba(236,72,153,0.2)}
.role-divider.account span{background:rgba(52,211,153,0.08);border:1px solid rgba(52,211,153,0.2)}

/* Footer */
.footer{text-align:center;padding:40px 0;color:var(--text-muted);font-size:0.8rem;border-top:1px solid rgba(255,255,255,0.06);margin-top:40px}
.footer strong{color:var(--text-dim)}
.footer a{color:var(--cyan);text-decoration:none}

/* Scroll to Top */
.scroll-to-top{
  position:fixed;bottom:28px;right:28px;z-index:999;
  width:44px;height:44px;border-radius:50%;
  background:linear-gradient(135deg,#22d3ee,#06b6d4);
  box-shadow:0 4px 15px rgba(34,211,238,0.3);
  display:flex;align-items:center;justify-content:center;
  color:#0d0d1f;font-size:18px;
  text-decoration:none;cursor:pointer;
  opacity:0;transform:translateY(20px);
  transition:opacity 0.3s,transform 0.3s,box-shadow 0.2s;
  pointer-events:none;
}
.scroll-to-top.show{opacity:1;transform:translateY(0);pointer-events:auto}
.scroll-to-top:hover{box-shadow:0 6px 25px rgba(34,211,238,0.5);transform:translateY(-2px)}

/* Print */
@media print{
  body{background:#fff !important;color:#111 !important}
  .bg-orbs{display:none}
  .wrapper{padding:20px}
  .guide-card,.toc,.step,.tip{border-color:#ddd !important;background:#f9f9f9 !important}
  .section-header{border-color:#ccc !important}
  *{color:#111 !important;-webkit-print-color-adjust:exact !important;print-color-adjust:exact !important}
  @page{margin:15mm}
}

/* Responsive */
@media(max-width:700px){
  .brand-bar{padding:12px 16px;flex-wrap:wrap;gap:8px}
  .brand-nav{margin-left:0;width:100%;justify-content:center;gap:8px;padding-top:6px;border-top:1px solid rgba(34,211,238,0.06)}
  .brand-nav a{font-size:12px;padding:5px 10px}
}
@media(max-width:640px){
  .toc-grid{grid-template-columns:1fr}
  .wrapper{padding:20px 14px 60px}
  .cover{padding:80px 0 24px}
  .cover-logo h1{font-size:1.8rem}
  .cover h2{font-size:1.3rem}
  .cover p{font-size:0.9rem}
  .toc{padding:20px 16px}
  .section{margin:32px 0}
  .section-header{flex-wrap:wrap;gap:8px}
  .section-header h2{font-size:1.1rem}
  .section-header .role-tag{margin-left:0}
  .guide-card{padding:16px;border-radius:12px}
  .step{padding:10px 12px}
  .feat-list li{font-size:0.83rem}
  .role-divider{font-size:1.1rem;padding:24px 0}
  .scroll-to-top{bottom:20px;right:20px;width:40px;height:40px;font-size:16px}
}