/* === COKA DOCS — Modern Clean Design === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#fff;
  --bg-sidebar:#f8f9fb;
  --bg-hover:#f1f3f5;
  --bg-active:#eef2ff;
  --bg-code:#f4f5f7;
  --border:#e8eaed;
  --text:#1a1a2e;
  --text-secondary:#5f6368;
  --text-muted:#9aa0a6;
  --accent:#4f46e5;
  --accent-light:#eef2ff;
  --orange:#e8740c;
  --green:#059669;
  --red:#dc2626;
  --amber:#d97706;
  --sidebar-w:260px;
  --radius:8px;
  --radius-lg:12px;
  --shadow:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
  --shadow-md:0 4px 12px rgba(0,0,0,.08);
  --transition:.2s ease;
}

html{scroll-behavior:smooth}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;display:flex;min-height:100vh;font-size:15px}

/* ==================== TOP NAV ==================== */
.topnav{
  position:fixed;top:0;left:0;right:0;z-index:200;
  background:rgba(255,255,255,.95);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  height:56px;display:flex;align-items:center;padding:0 24px
}
.topnav-left{display:flex;align-items:center;gap:10px}
.topnav-left .brand{
  font-size:15px;font-weight:700;color:var(--text);
  display:flex;align-items:center;gap:8px;text-decoration:none
}
.topnav-left .brand svg{width:24px;height:24px}
.menu-toggle{display:none;background:none;border:none;font-size:20px;cursor:pointer;padding:4px 8px}

/* ==================== SIDEBAR ==================== */
.sidebar{
  position:fixed;top:56px;left:0;bottom:0;width:var(--sidebar-w);
  background:var(--bg-sidebar);border-right:1px solid var(--border);
  overflow-y:auto;padding:20px 0;z-index:100;
  scrollbar-width:thin;scrollbar-color:#ddd transparent
}
.sidebar-section{padding:0 16px;margin-bottom:4px}
/* Sidebar collapsible groups */
.sidebar-group{margin-bottom:2px;border:none}
.sidebar-group summary{list-style:none;cursor:pointer}
.sidebar-group summary::-webkit-details-marker{display:none}
.sidebar-section-title{
  display:flex;align-items:center;gap:6px;
  padding:8px 16px;font-size:11px;font-weight:700;
  text-transform:uppercase;letter-spacing:.08em;
  color:var(--accent);user-select:none;
  transition:background .2s
}
.sidebar-section-title:hover{background:rgba(79,70,229,.06);border-radius:6px}
.sidebar-section-title .section-icon{font-size:13px}
.sidebar-toggle-icon{
  margin-left:auto;font-size:10px;transition:transform .25s ease;
  color:var(--text-muted)
}
.sidebar-group:not([open]) .sidebar-toggle-icon{transform:rotate(-90deg)}
.sidebar-group .sidebar-nav{
  overflow:hidden;animation:slideDown .2s ease
}
@keyframes slideDown{from{opacity:0;max-height:0}to{opacity:1;max-height:500px}}
.sidebar-section + .sidebar-section{margin-top:16px}
.sidebar-nav{list-style:none;padding:0 12px}
.sidebar-nav li{margin-bottom:1px}
.sidebar-nav li a{
  display:flex;align-items:center;gap:8px;
  padding:6px 12px;border-radius:6px;
  color:var(--text-secondary);text-decoration:none;
  font-size:13.5px;font-weight:450;transition:var(--transition)
}
.sidebar-nav li a:hover{background:var(--bg-hover);color:var(--text)}
.sidebar-nav li a.active{background:var(--accent-light);color:var(--accent);font-weight:600}
.sidebar-nav li a .diamond{color:var(--orange);font-size:8px;flex-shrink:0}
.sidebar-sub{list-style:none;padding:2px 0 2px 18px;margin:0;border-left:2px solid #e5e7eb;margin-left:18px}
.sidebar-sub li a{font-size:12.5px;padding:4px 10px;color:var(--text-muted)}
.sidebar-sub li a:hover{color:var(--accent);background:rgba(79,70,229,.04)}
.sidebar-sub li a .diamond{font-size:6px;color:#c4b5fd}
.powered-by{padding:20px 24px;font-size:12px;color:var(--text-muted)}

/* ==================== MAIN CONTENT ==================== */
.main{margin-left:var(--sidebar-w);margin-top:56px;flex:1;min-width:0}
.content{max-width:800px;margin:0 auto;padding:48px 40px 100px}

/* ==================== TYPOGRAPHY ==================== */
.page-title{margin-bottom:8px}
.page-title h1{
  font-size:1.75rem;font-weight:800;color:var(--text);
  letter-spacing:-.025em;display:flex;align-items:center;gap:8px;line-height:1.3
}
.page-title h1 .diamond-icon{color:var(--orange);font-size:1rem}
.copy-page-btn{display:none}
.content>.subtitle{font-size:15px;color:var(--text-secondary);margin-bottom:32px;line-height:1.8}
.content h2{font-size:1.35rem;font-weight:700;color:var(--text);margin:40px 0 12px}
.content h3{font-size:1.05rem;font-weight:600;color:var(--text);margin:28px 0 10px}
.content h4{font-size:.9rem;font-weight:600;color:var(--text);margin:20px 0 6px}
.content p{margin-bottom:12px;color:var(--text-secondary);line-height:1.75}
.content a{color:var(--accent);text-decoration:none}
.content a:hover{text-decoration:underline}
.content ul,
.content ol{padding-left:22px;margin-bottom:12px;color:var(--text-secondary)}
.content li{margin-bottom:4px}

/* ==================== SECTIONS ==================== */
.content section{padding-bottom:40px;margin-bottom:40px;border-bottom:1px solid #f0f2f5}
.content section:last-of-type{border-bottom:none;margin-bottom:0;padding-bottom:0}
.section-divider{height:4px;background:linear-gradient(90deg,var(--accent),#818cf8);border-radius:4px;margin:48px 0}
.last-updated{display:none}

/* ==================== CODE BLOCKS ==================== */
.code-block{
  border:1px solid var(--border);border-radius:var(--radius-lg);
  overflow:hidden;margin:12px 0 16px;background:var(--bg-code)
}
.code-header{
  display:flex;justify-content:space-between;align-items:center;
  padding:8px 16px;background:#eceef1;border-bottom:1px solid var(--border);
  font-size:12.5px;font-weight:500;color:var(--text-secondary)
}
.copy-btn{
  background:none;border:1px solid var(--border);border-radius:6px;
  padding:4px 12px;font-size:12px;color:var(--text-secondary);cursor:pointer;
  transition:var(--transition)
}
.copy-btn:hover{border-color:var(--accent);color:var(--accent);background:#fff}
pre{
  font-family:'JetBrains Mono',monospace;font-size:13px;
  padding:16px;overflow-x:auto;line-height:1.6;color:#374151
}
.hl-key{color:#4f46e5}.hl-str{color:#059669}.hl-token{color:#dc2626;font-weight:600}
kbd{
  font-family:'JetBrains Mono',monospace;font-size:12px;
  background:#f1f3f5;border:1px solid var(--border);border-radius:4px;
  padding:2px 8px;color:var(--text)
}

/* ==================== TABS ==================== */
.tabs{
  display:flex;flex-wrap:wrap;gap:6px;
  padding:4px;background:#f1f3f5;border-radius:10px;margin-bottom:16px
}
.tab-btn{
  display:flex;align-items:center;gap:6px;
  padding:8px 14px;border:none;border-radius:8px;
  background:transparent;font-size:13px;font-weight:500;
  cursor:pointer;color:var(--text-secondary);transition:var(--transition)
}
.tab-btn:hover{background:rgba(255,255,255,.7);color:var(--text)}
.tab-btn.active{background:#fff;color:var(--text);box-shadow:var(--shadow);font-weight:600}
.tab-btn img,.tab-btn svg{flex-shrink:0}
.tab-content{display:none;padding:16px 0}
.tab-content.active{display:block}

/* ==================== ALERTS ==================== */
.alert{
  display:flex;gap:10px;padding:14px 16px;border-radius:var(--radius);
  margin:12px 0;font-size:14px;line-height:1.6
}
.alert-icon{font-size:16px;flex-shrink:0;margin-top:1px}
.alert-info{background:#eff6ff;border-left:3px solid #3b82f6;color:#1e40af}
.alert-warn{background:#fffbeb;border-left:3px solid #f59e0b;color:#92400e}
.alert-success{background:#ecfdf5;border-left:3px solid #10b981;color:#065f46}
.alert-error{background:#fef2f2;border-left:3px solid #ef4444;color:#991b1b}

/* ==================== STEPS ==================== */
.steps{counter-reset:step}
.step{counter-increment:step;position:relative;padding:12px 0 12px 48px;margin-bottom:4px}
.step::before{
  content:counter(step);position:absolute;left:0;top:14px;
  width:32px;height:32px;border-radius:50%;
  background:var(--accent);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:13px;font-weight:700
}
.step h4{margin:0 0 4px;font-size:.9rem}
.step p,.step ul{font-size:14px;color:var(--text-secondary);margin-bottom:4px}

/* ==================== FLOW CARDS (Luồng xử lý) ==================== */
.flow-card{
  border:1px solid var(--border);border-radius:var(--radius-lg);
  margin:16px 0;overflow:hidden;background:#fff
}
.flow-card-header{
  display:flex;align-items:center;gap:10px;
  padding:14px 18px;background:linear-gradient(135deg,#f8f9fb,#eef2ff);
  border-bottom:1px solid var(--border);cursor:pointer;
  transition:var(--transition)
}
.flow-card-header:hover{background:linear-gradient(135deg,#eef2ff,#e0e7ff)}
.flow-card-header .flow-icon{font-size:20px;flex-shrink:0}
.flow-card-header .flow-title{font-weight:700;font-size:15px;color:var(--text);flex:1}
.flow-card-header .flow-badge{
  font-size:11px;font-weight:600;padding:3px 10px;border-radius:20px;
  background:var(--accent);color:#fff;white-space:nowrap
}
.flow-card-header .flow-toggle{font-size:10px;color:var(--text-muted);transition:.3s}
.flow-card-body{padding:0 18px;max-height:0;overflow:hidden;transition:max-height .4s ease,padding .3s}
.flow-card.open .flow-card-body{max-height:2000px;padding:16px 18px}
.flow-card.open .flow-toggle{transform:rotate(180deg)}
.flow-desc{font-size:14px;color:var(--text-secondary);margin-bottom:14px;line-height:1.7}
/* Chú thích (legend) cho chấm bắt buộc vs tùy chọn */
.flow-legend{display:flex;gap:18px;align-items:center;margin-bottom:14px;font-size:12.5px;color:var(--text-muted)}
.flow-legend-item{display:flex;align-items:center;gap:6px}
.flow-legend-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}
.flow-legend-dot.required{background:var(--accent);border:2px solid #fff;box-shadow:0 0 0 2px var(--accent)}
.flow-legend-dot.optional{background:var(--accent);border:2px solid #fff;box-shadow:0 0 0 2px var(--accent)}
.flow-steps{position:relative;padding-left:22px}
.flow-steps::before{
  content:'';position:absolute;left:6px;top:4px;bottom:4px;
  width:2px;background:linear-gradient(180deg,var(--accent),#c4b5fd);border-radius:1px
}
.flow-step{position:relative;padding:6px 0 14px 14px;font-size:13.5px;color:var(--text)}
.flow-step::before{
  content:'';position:absolute;left:-22px;top:11px;
  width:10px;height:10px;border-radius:50%;
  background:var(--accent);border:2px solid #fff;box-shadow:0 0 0 2px var(--accent)
}
.flow-step .tool-name{
  font-family:'JetBrains Mono',monospace;font-size:12.5px;
  background:#eef2ff;color:var(--accent);padding:2px 8px;
  border-radius:4px;font-weight:500
}
.flow-step .flow-arrow{color:var(--text-muted);margin:0 6px;font-size:11px}
.flow-step .flow-note{display:block;font-size:12.5px;color:var(--text-muted);margin-top:2px}
.flow-step.optional::before{background:var(--accent);border:2px solid #fff;box-shadow:0 0 0 2px var(--accent)}
/* Response mẫu trong flow step */
.flow-response{margin-top:6px}
.flow-response summary{
  cursor:pointer;font-size:11.5px;color:var(--accent);font-weight:500;
  user-select:none;list-style:none;display:inline-flex;align-items:center;gap:4px
}
.flow-response summary::-webkit-details-marker{display:none}
.flow-response summary::before{content:'▶';font-size:9px;transition:transform .2s}
.flow-response[open] summary::before{transform:rotate(90deg)}
.flow-response pre{
  margin:6px 0 0;padding:10px 12px;background:#1e1e2e;color:#cdd6f4;
  border-radius:6px;font-size:11.5px;line-height:1.5;overflow-x:auto;
  font-family:'JetBrains Mono',monospace;max-height:200px;overflow-y:auto
}
.flow-response pre .json-key{color:#89b4fa}
.flow-response pre .json-str{color:#a6e3a1}
.flow-response pre .json-num{color:#fab387}
.flow-response pre .json-bool{color:#f38ba8}

/* ==================== TABLES ==================== */
.table-wrap{overflow-x:auto;margin:12px 0 16px;border:1px solid var(--border);border-radius:var(--radius-lg)}
table{width:100%;border-collapse:collapse;font-size:14px}
thead{background:#f8f9fa}
th{padding:10px 16px;text-align:left;font-weight:600;color:var(--text);border-bottom:2px solid var(--border);font-size:13px;text-transform:uppercase;letter-spacing:.03em}
td{padding:10px 16px;border-bottom:1px solid #f0f2f5;color:var(--text-secondary);vertical-align:top}
tr:last-child td{border-bottom:none}
tr:hover td{background:#fafbfc}

/* ==================== ENDPOINTS ==================== */
.endpoint{
  display:flex;align-items:center;gap:10px;
  padding:10px 14px;background:var(--bg-code);border:1px solid var(--border);
  border-radius:var(--radius);margin:6px 0 16px;font-family:'JetBrains Mono',monospace;font-size:13px
}
.method{
  padding:3px 10px;border-radius:4px;font-size:11px;font-weight:700;
  text-transform:uppercase;letter-spacing:.04em;flex-shrink:0
}
.method-get{background:#dcfce7;color:#166534}
.method-post{background:#dbeafe;color:#1e40af}
.method-put{background:#fef3c7;color:#92400e}
.method-patch{background:#e0e7ff;color:#3730a3}
.method-delete{background:#fee2e2;color:#991b1b}
.endpoint code{font-size:13px;color:var(--text);word-break:break-all}

/* ==================== FAQ ==================== */
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:8px;overflow:hidden}
.faq-q{padding:12px 16px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:14px;transition:var(--transition)}
.faq-q:hover{background:var(--bg-hover)}
.faq-q .arrow{font-size:10px;color:var(--text-muted);transition:.3s}
.faq-a{max-height:0;overflow:hidden;padding:0 16px;font-size:14px;color:var(--text-secondary);transition:max-height .3s,padding .3s;line-height:1.7}
.faq-item.open .faq-a{max-height:200px;padding:0 16px 14px}
.faq-item.open .faq-q .arrow{transform:rotate(180deg)}

/* ==================== FOOTER ==================== */
footer{text-align:center;padding:32px 0;color:var(--text-muted);font-size:13px;margin-top:32px;border-top:1px solid var(--border)}
footer a{color:var(--accent);text-decoration:none;font-weight:500}
footer a:hover{text-decoration:underline}

/* ==================== RESPONSIVE ==================== */
@media(max-width:768px){
  .sidebar{transform:translateX(-100%);transition:.3s;z-index:300;box-shadow:none}
  .sidebar.open{transform:translateX(0);box-shadow:var(--shadow-md)}
  .menu-toggle{display:block}
  .main{margin-left:0}
  .content{padding:24px 16px 60px}
  .tabs{gap:4px}
  .tab-btn{padding:6px 10px;font-size:12px}
  .endpoint{flex-direction:column;align-items:flex-start;gap:6px}
}