/* ===== Reset & base ===== */
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  background:#f4f6fb;
  color:#1f2937;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  -webkit-text-size-adjust:100%;
}
a{color:#2563eb;text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%;display:block}

/* ===== Topbar ===== */
.topbar{
  display:flex;align-items:center;gap:20px;
  padding:12px 24px;
  background:#fff;
  border-bottom:1px solid #e5e7eb;
  box-shadow:0 1px 2px rgba(15,23,42,.03);
  flex-wrap:wrap;
  position:sticky;top:0;z-index:50;
}
.topbar .brand a{font-weight:700;color:#0f172a;font-size:17px;letter-spacing:-.01em}
.topbar nav{display:flex;gap:6px;flex:1;flex-wrap:wrap}
.topbar nav a{
  color:#475569;font-size:14px;font-weight:500;
  padding:6px 10px;border-radius:6px;
}
.topbar nav a:hover{background:#f1f5f9;text-decoration:none;color:#0f172a}
.topbar .user{display:flex;align-items:center;gap:12px;font-size:13px;color:#64748b}
.topbar .user span{max-width:160px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ===== Layout ===== */
.container{max-width:1040px;margin:24px auto;padding:0 20px}
h1{margin:0 0 18px;font-size:22px;font-weight:700;color:#0f172a;letter-spacing:-.01em}
h2{margin:24px 0 12px;font-size:16px;font-weight:600;color:#0f172a}
p{margin:0 0 12px}

/* ===== Card ===== */
.card{
  background:#fff;
  border:1px solid #e5e7eb;
  border-radius:12px;
  padding:20px;
  margin-bottom:16px;
  box-shadow:0 1px 2px rgba(15,23,42,.04);
}

/* ===== Form ===== */
label{display:block;font-size:13px;font-weight:500;color:#374151;margin-bottom:6px}
input[type=text],input[type=email],input[type=number],input[type=password],textarea,select{
  width:100%;
  padding:10px 12px;
  border:1px solid #d1d5db;
  border-radius:8px;
  font:inherit;
  background:#fff;
  color:inherit;
  transition:border-color .15s,box-shadow .15s;
}
input:focus,textarea:focus,select:focus{
  outline:none;
  border-color:#2563eb;
  box-shadow:0 0 0 3px rgba(37,99,235,.15);
}
textarea{resize:vertical;min-height:120px;font-family:inherit;line-height:1.5}
.field{margin-bottom:16px}
.hint{font-size:12px;color:#6b7280;margin-top:4px}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:9px 16px;
  border-radius:8px;
  border:1px solid transparent;
  background:#2563eb;color:#fff;
  cursor:pointer;
  font:inherit;font-weight:500;font-size:14px;
  transition:background .15s,box-shadow .15s,transform .05s;
  text-decoration:none;
  min-height:38px;
}
.btn:hover{background:#1d4ed8;text-decoration:none}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.6;cursor:not-allowed}
.btn.secondary{background:#fff;color:#374151;border-color:#d1d5db}
.btn.secondary:hover{background:#f9fafb}
.btn.danger{background:#dc2626}
.btn.danger:hover{background:#b91c1c}
button.link{
  background:none;border:none;color:#2563eb;cursor:pointer;
  font:inherit;font-size:13px;padding:0;
}
button.link:hover{text-decoration:underline}

/* ===== Table ===== */
.table-wrap,table{
  background:#fff;
  border:1px solid #e5e7eb;
  border-radius:12px;
  overflow:hidden;
  box-shadow:0 1px 2px rgba(15,23,42,.04);
}
table{width:100%;border-collapse:collapse;border-spacing:0;border:1px solid #e5e7eb}
th,td{padding:12px 14px;border-bottom:1px solid #f1f5f9;text-align:left;font-size:14px;vertical-align:middle}
tr:last-child td{border-bottom:none}
th{background:#f8fafc;font-weight:600;color:#475569;font-size:12px;text-transform:uppercase;letter-spacing:.03em}
tbody tr:hover{background:#f9fafb}

/* ===== Flash / alert ===== */
.flash{
  padding:12px 16px;border-radius:8px;margin-bottom:16px;
  font-size:14px;border:1px solid transparent;
}
.flash-success{background:#ecfdf5;color:#065f46;border-color:#a7f3d0}
.flash-error{background:#fef2f2;color:#991b1b;border-color:#fecaca}
.flash-info{background:#eff6ff;color:#1e40af;border-color:#bfdbfe}

/* ===== Misc ===== */
.muted{color:#6b7280;font-size:13px}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.row.between{justify-content:space-between}
.tag{
  display:inline-block;padding:3px 10px;border-radius:999px;
  font-size:11px;font-weight:600;
  background:#e5e7eb;color:#374151;
  text-transform:uppercase;letter-spacing:.03em;
}
.tag.pending{background:#fef3c7;color:#92400e}
.tag.approved,.tag.done{background:#d1fae5;color:#065f46}
.tag.disabled,.tag.error{background:#fee2e2;color:#991b1b}
.tag.processing{background:#dbeafe;color:#1e40af}

pre{
  background:#0f172a;color:#e2e8f0;
  padding:14px 16px;border-radius:10px;
  overflow-x:auto;
  font-size:12.5px;line-height:1.55;
  white-space:pre-wrap;word-break:break-word;
  font-family:"SF Mono",Menlo,Consolas,monospace;
}

/* ===== Auth screens ===== */
.center{display:grid;place-items:center;min-height:100vh;padding:20px}
.auth-card{
  background:#fff;
  padding:32px 28px;
  border-radius:14px;
  border:1px solid #e5e7eb;
  width:100%;max-width:400px;
  box-shadow:0 10px 30px rgba(15,23,42,.08);
}
.auth-card h1{text-align:center;margin-bottom:6px}
.auth-card .sub{text-align:center;color:#6b7280;font-size:14px;margin-bottom:22px}
.otp-input{font-size:26px;text-align:center;letter-spacing:12px;font-weight:600}

/* ===== Playground chunks ===== */
.chunk{
  border:1px solid #e5e7eb;
  padding:12px 14px;
  border-radius:10px;
  margin-bottom:10px;
  background:#fff;
  font-size:13.5px;
  line-height:1.55;
  box-shadow:0 1px 2px rgba(15,23,42,.03);
}
.chunk .meta{font-size:11.5px;color:#64748b;margin-bottom:6px}

/* ===== Markdown answer ===== */
.markdown-body{
  color:#172033;
  font-size:15px;
  line-height:1.72;
  overflow-wrap:anywhere;
}
.markdown-body > :first-child{margin-top:0}
.markdown-body > :last-child{margin-bottom:0}
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4{
  color:#0f172a;
  line-height:1.25;
  letter-spacing:0;
  margin:22px 0 10px;
}
.markdown-body h1{font-size:21px}
.markdown-body h2{font-size:18px}
.markdown-body h3{font-size:16px}
.markdown-body h4{font-size:15px}
.markdown-body p{margin:0 0 13px}
.markdown-body ul,
.markdown-body ol{
  margin:0 0 14px;
  padding-left:24px;
}
.markdown-body li{margin:5px 0}
.markdown-body li > p{margin:6px 0}
.markdown-body a{
  color:#1d4ed8;
  font-weight:500;
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}
.markdown-body a:hover{color:#1e40af}
.markdown-body strong{color:#0f172a;font-weight:700}
.markdown-body blockquote{
  margin:16px 0;
  padding:10px 14px;
  border-left:4px solid #93c5fd;
  background:#eff6ff;
  color:#334155;
  border-radius:0 8px 8px 0;
}
.markdown-body code{
  background:#f1f5f9;
  color:#0f172a;
  border:1px solid #e2e8f0;
  border-radius:6px;
  padding:2px 5px;
  font-family:"SF Mono",Menlo,Consolas,monospace;
  font-size:.9em;
}
.markdown-body pre{
  margin:16px 0;
  border-radius:10px;
}
.markdown-body pre code{
  background:transparent;
  color:inherit;
  border:none;
  padding:0;
  font-size:inherit;
}
.markdown-body img{
  display:block;
  width:auto;
  max-width:100%;
  max-height:420px;
  margin:14px 0;
  border-radius:10px;
  border:1px solid #e5e7eb;
  box-shadow:0 8px 24px rgba(15,23,42,.08);
  object-fit:contain;
  background:#f8fafc;
}
.markdown-body table{
  display:block;
  width:100%;
  overflow-x:auto;
  margin:16px 0;
  border-radius:10px;
}
.markdown-body th,
.markdown-body td{
  min-width:120px;
  vertical-align:top;
}
.markdown-body hr{
  border:none;
  border-top:1px solid #e5e7eb;
  margin:20px 0;
}

/* ===== Mobile (<=768px) ===== */
@media (max-width:768px){
  .container{margin:14px auto;padding:0 14px}
  h1{font-size:19px;margin-bottom:14px}
  h2{font-size:15px;margin:18px 0 10px}

  .topbar{
    padding:10px 14px;gap:10px;
    flex-wrap:wrap;
  }
  .topbar .brand{flex:1 0 auto}
  .topbar .brand a{font-size:15px}
  .topbar nav{order:3;width:100%;gap:2px;border-top:1px solid #f1f5f9;padding-top:8px;margin-top:4px}
  .topbar nav a{font-size:13px;padding:6px 8px}
  .topbar .user{font-size:12px;gap:8px}
  .topbar .user span{max-width:120px}

  .card{padding:14px;border-radius:10px}

  /* Tables → card-style: mỗi <tr> thành 1 card đứng, mỗi <td> 1 dòng có label */
  table,thead,tbody,tr,th,td{display:block;border:none}
  table{
    background:transparent;
    box-shadow:none;
    border-radius:0;
    overflow:visible;
  }
  thead{position:absolute;left:-9999px;top:-9999px}  /* ẩn header bằng cách di chuyển khỏi viewport (giữ accessibility) */
  tbody tr{
    background:#fff;
    border:1px solid #e5e7eb;
    border-radius:12px;
    padding:6px 4px;
    margin-bottom:10px;
    box-shadow:0 1px 2px rgba(15,23,42,.04);
  }
  tbody tr:hover{background:#fff}
  tbody td{
    display:flex;
    justify-content:space-between;
    align-items:flex-start;
    gap:12px;
    padding:8px 14px;
    border-bottom:1px solid #f1f5f9;
    font-size:13.5px;
    text-align:right;
    word-break:break-word;
  }
  tbody td:last-child{border-bottom:none}
  tbody td::before{
    content:attr(data-label);
    font-weight:600;
    color:#475569;
    font-size:12px;
    text-transform:uppercase;
    letter-spacing:.03em;
    flex-shrink:0;
    text-align:left;
    min-width:80px;
  }
  tbody td[data-label=""]::before{display:none}
  tbody td[data-label=""]{justify-content:flex-end}

  .btn{width:auto;min-height:40px;padding:10px 16px}
  .row.between{gap:10px}
  .row.between h1{margin-bottom:0}

  .auth-card{padding:24px 20px;border-radius:12px}
  .otp-input{letter-spacing:8px;font-size:22px}

  pre{font-size:11.5px;padding:12px}
  .chunk{font-size:13px;padding:10px 12px}
  .markdown-body{font-size:14px;line-height:1.65}
  .markdown-body h1{font-size:19px}
  .markdown-body h2{font-size:17px}
  .markdown-body h3{font-size:15px}
  .markdown-body ul,
  .markdown-body ol{padding-left:20px}
  .markdown-body img{max-height:320px;border-radius:8px}
  .markdown-body table{display:block}
  .markdown-body thead{position:static}
  .markdown-body tbody{display:table-row-group}
  .markdown-body tr{display:table-row}
  .markdown-body th,
  .markdown-body td{
    display:table-cell;
    text-align:left;
    padding:10px 12px;
  }
  .markdown-body td::before{display:none}
}

/* ===== Small phones (<=420px) ===== */
@media (max-width:420px){
  .container{padding:0 12px}
  .topbar{padding:8px 12px}
  .topbar .user span{max-width:90px}
  .btn{font-size:13.5px;padding:9px 14px}
}

/* ===== Media upload widget ===== */
.upzone{
  border:2px dashed #cbd5e1;border-radius:10px;
  padding:18px 16px;background:#fff;color:#475569;font-size:14px;
  transition:border-color .15s,background .15s;outline:none;
}
.upzone.drag{border-color:#2563eb;background:#eff6ff}
.upzone.busy{opacity:.6;pointer-events:none}
.upzone .hint{margin-top:8px}
.up-list{list-style:none;margin:12px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}
.up-item{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;
  padding:10px 12px;background:#fff;border:1px solid #e5e7eb;border-radius:8px;font-size:13.5px;
}
.up-item .up-name{font-weight:600;color:#0f172a}
.up-item .up-url{flex:1;min-width:200px;word-break:break-all;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12.5px}
.up-item .up-actions{display:flex;gap:6px;margin-left:auto}
.up-item.up-error{color:#b91c1c;background:#fef2f2;border-color:#fecaca}