:root {
  --bg: #0A1A1A;
  --bg-card: #0f2828;
  --bg-card-hover: #143232;
  --bg-input: #071515;
  --text: #e0f0f0;
  --text-secondary: #8ab4b4;
  --text-muted: #5a8a8a;
  --primary: #00CEC9;
  --primary-light: #81ECEC;
  --accent: #E17055;
  --accent-light: #fab1a0;
  --deprecated: #d63031;
  --border: rgba(0,206,201,0.1);
  --border-strong: rgba(0,206,201,0.25);
  --shadow: 0 4px 14px rgba(0,0,0,0.5);
  --radius: 12px;
  --font: 'Inter',-apple-system,sans-serif;
  --mono: 'JetBrains Mono',monospace;
  --transition: 0.25s ease;
  --glass: rgba(15,40,40,0.85);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px}
body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh}

.header{position:sticky;top:0;z-index:50;background:var(--glass);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.header-inner{max-width:900px;margin:0 auto;padding:12px 24px;display:flex;align-items:center}
.logo{display:flex;align-items:center;gap:10px}
.logo-icon{font-size:1.3rem}
.logo h1{font-size:1.15rem;font-weight:700;color:var(--primary)}

.main{max-width:900px;margin:0 auto;padding:20px 24px}

/* Flow Selector */
.flow-selector{display:flex;gap:8px;margin-bottom:20px;flex-wrap:wrap}
.flow-tab{display:flex;align-items:center;gap:6px;padding:10px 16px;border:1px solid var(--border);border-radius:var(--radius);background:transparent;color:var(--text-secondary);font-family:var(--font);font-size:0.82rem;font-weight:500;cursor:pointer;transition:all var(--transition)}
.flow-tab:hover{background:rgba(0,206,201,0.06);border-color:var(--primary)}
.flow-tab.active{background:rgba(0,206,201,0.1);border-color:var(--primary);color:var(--primary)}
.flow-tab.deprecated{border-color:rgba(214,48,49,0.2)}
.flow-tab.deprecated:hover,.flow-tab.deprecated.active{border-color:var(--deprecated);color:var(--deprecated)}
.tab-icon{font-size:1rem}

/* Flow Description */
.flow-desc{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;margin-bottom:20px}
.flow-desc h2{font-size:1.1rem;font-weight:700;margin-bottom:6px;color:var(--primary-light)}
.flow-desc p{font-size:0.85rem;color:var(--text-secondary);line-height:1.6}
.flow-desc .deprecation-warning{display:inline-block;margin-top:8px;padding:4px 12px;border-radius:6px;background:rgba(214,48,49,0.12);color:var(--deprecated);font-size:0.78rem;font-weight:600}
.flow-desc .use-cases{margin-top:8px;font-size:0.78rem;color:var(--text-muted)}
.flow-desc .use-cases strong{color:var(--text-secondary)}

/* Diagram */
.diagram-area{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:20px;position:relative}
.diagram-actors{display:flex;justify-content:space-around;margin-bottom:16px;gap:10px}
.actor-box{text-align:center;padding:10px 16px;border-radius:var(--radius);border:1px solid var(--border-strong);background:var(--bg-input);min-width:100px}
.actor-label{font-size:0.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}
.actor-name{font-size:0.85rem;font-weight:600;color:var(--primary-light);margin-top:2px}

.diagram-steps{display:flex;flex-direction:column;gap:0;position:relative;padding:0 20px}
.step-row{display:flex;align-items:center;gap:8px;padding:10px 14px;border-radius:8px;cursor:pointer;transition:all var(--transition);border:1px solid transparent}
.step-row:hover{background:rgba(0,206,201,0.04);border-color:var(--border)}
.step-row.active{background:rgba(0,206,201,0.08);border-color:var(--primary)}
.step-num{width:28px;height:28px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:rgba(0,206,201,0.12);color:var(--primary);font-size:0.75rem;font-weight:700;flex-shrink:0}
.step-arrow{font-size:0.8rem;color:var(--primary);flex-shrink:0;min-width:30px;text-align:center}
.step-label{font-size:0.82rem;color:var(--text-secondary);flex:1}
.step-label strong{color:var(--text)}

/* Step Detail */
.step-detail{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;animation:fadeIn .3s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
.step-detail h3{font-size:0.95rem;font-weight:700;color:var(--primary-light);margin-bottom:6px}
.step-detail p{font-size:0.82rem;color:var(--text-secondary);line-height:1.6;margin-bottom:12px}

.code-block{margin-bottom:12px}
.code-header{font-size:0.68rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:4px}
.code-block pre{background:var(--bg-input);border:1px solid var(--border);border-radius:8px;padding:12px 14px;overflow-x:auto}
.code-block code{font-family:var(--mono);font-size:0.78rem;color:var(--primary-light);line-height:1.5;white-space:pre}

@media(max-width:640px){
  .flow-selector{flex-direction:column}
  .diagram-actors{flex-wrap:wrap}
  .actor-box{min-width:70px;flex:1}
}