:root{
  --bg-deep:#010409;--bg-base:#0d1117;--bg-elevated:#161b22;--surface:#161b22;--surface-2:#21262d;--surface-strong:#30363d;
  --fg:#e6edf3;--fg-muted:#7d8590;--fg-faint:#6e7681;--accent:#1f6feb;--accent-hover:#388bfd;--accent-soft:rgba(56,139,253,0.15);
  --online:#3fb950;--danger:#f85149;--warning:#d29922;--border:#30363d;--border-strong:#484f58;--radius:6px;
  font-synthesis:none;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans",Helvetica,Arial,sans-serif;
  background:var(--bg-base);color:var(--fg);font-size:14px;-webkit-font-smoothing:antialiased;height:100vh;overflow:hidden}
button{font-family:inherit;cursor:pointer}
input,textarea,select{font-family:inherit}

/* login */
#login{display:flex;align-items:center;justify-content:center;height:100vh;background:var(--bg-deep)}
.login-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);padding:36px 32px;width:min(380px,92vw)}
.login-card h1{font-size:20px;font-weight:700;margin-bottom:4px}
.login-card p{color:var(--fg-muted);font-size:13px;margin-bottom:22px}
.field{margin-bottom:14px}
.field label{display:block;font-size:12px;color:var(--fg-muted);margin-bottom:6px}
.field input{width:100%;padding:10px 12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--fg);font-size:15px;outline:none}
.field input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.btn{padding:10px 16px;border:none;border-radius:var(--radius);background:var(--accent);color:#fff;font-size:14px;font-weight:600}
.btn:hover{background:var(--accent-hover)}
.btn.full{width:100%;padding:12px}
.btn.ghost{background:var(--surface-2);color:var(--fg);border:1px solid var(--border)}
.btn.ghost:hover{background:var(--surface-strong)}
.err{color:var(--danger);font-size:13px;margin-top:10px;min-height:16px}

/* app shell */
#app{display:none;flex-direction:column;height:100vh}
.topbar{display:flex;align-items:center;gap:14px;padding:12px 18px;background:var(--bg-elevated);border-bottom:1px solid var(--border);min-height:56px}
.topbar h1{font-size:17px;font-weight:700}
.spacer{flex:1}
.tabs{display:flex;gap:4px;background:var(--surface-2);border:1px solid var(--border);border-radius:999px;padding:3px}
.tab{padding:6px 16px;border:none;background:none;color:var(--fg-muted);border-radius:999px;font-size:13px;font-weight:600}
.tab.active{background:var(--accent);color:#fff}
.icon-link{color:var(--fg-muted);text-decoration:none;font-size:13px;padding:6px 12px;border-radius:var(--radius)}
.icon-link:hover{background:var(--surface-2);color:var(--fg)}
.whoami{color:var(--fg-muted);font-size:13px}

/* board */
.board{flex:1;display:grid;grid-template-columns:repeat(3,1fr);gap:14px;padding:18px;overflow:auto}
.col{background:var(--bg-elevated);border:1px solid var(--border);border-radius:10px;display:flex;flex-direction:column;min-height:0}
.col-head{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid var(--border)}
.col-head .name{font-size:13px;font-weight:700;letter-spacing:.02em;text-transform:uppercase;color:var(--fg-muted)}
.col-head .count{font-size:12px;color:var(--fg-faint);background:var(--surface-2);border-radius:999px;padding:1px 8px}
.col-body{flex:1;overflow-y:auto;padding:10px;display:flex;flex-direction:column;gap:8px;min-height:60px}
.col-body.drop{outline:2px dashed var(--accent);outline-offset:-6px;border-radius:8px}
.add-card{margin:0 10px 10px;padding:8px;border:1px dashed var(--border-strong);background:none;color:var(--fg-muted);border-radius:var(--radius);font-size:13px}
.add-card:hover{color:var(--fg);border-color:var(--accent)}

.card{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:10px 12px;cursor:grab}
.card:active{cursor:grabbing}
.card.dragging{opacity:.5}
.card .title{font-size:14px;line-height:1.4;word-break:break-word}
.card .meta{display:flex;align-items:center;gap:8px;margin-top:8px;flex-wrap:wrap}
.chip{font-size:11px;padding:2px 8px;border-radius:999px;background:var(--surface-2);color:var(--fg-muted);display:inline-flex;align-items:center;gap:4px}
.chip.assignee{background:var(--accent-soft);color:var(--accent)}
.chip.due{background:rgba(210,153,34,.15);color:var(--warning)}
.chip.due.over{background:rgba(248,81,73,.15);color:var(--danger)}

/* modal */
.overlay{display:none;position:fixed;inset:0;background:rgba(1,4,9,.6);align-items:center;justify-content:center;padding:20px;z-index:100}
.overlay.show{display:flex}
.modal{background:var(--bg-elevated);border:1px solid var(--border);border-radius:10px;padding:22px;width:min(440px,94vw);max-height:88vh;overflow:auto;box-shadow:0 12px 40px rgba(1,4,9,.7)}
.modal h3{font-size:16px;font-weight:700;margin-bottom:16px}
.modal .field textarea{width:100%;padding:10px 12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--fg);font-size:14px;resize:vertical;min-height:70px;outline:none}
.modal .field select,.modal .field input{width:100%;padding:9px 12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--fg);font-size:14px;outline:none}
.modal-actions{display:flex;justify-content:space-between;gap:8px;margin-top:18px}
.modal-actions .right{display:flex;gap:8px;margin-left:auto}

/* admin */
.user-row{display:flex;align-items:center;gap:12px;padding:10px 4px;border-bottom:1px solid var(--border)}
.user-row .u-name{flex:1}
.user-row .u-name b{font-weight:600}
.user-row .u-name span{color:var(--fg-muted);font-size:12px;margin-left:6px}
/* toggle */
.switch{position:relative;display:inline-block;width:44px;height:24px;flex-shrink:0}
.switch input{opacity:0;width:0;height:0}
.slider{position:absolute;inset:0;background:var(--surface-strong);border-radius:24px;transition:background .15s}
.slider::before{content:"";position:absolute;top:3px;left:3px;width:18px;height:18px;background:#fff;border-radius:50%;transition:transform .15s}
.switch input:checked + .slider{background:var(--accent)}
.switch input:checked + .slider::before{transform:translateX(20px)}

.empty{color:var(--fg-muted);text-align:center;padding:40px;font-size:14px}
.no-access{display:flex;align-items:center;justify-content:center;height:100%;color:var(--fg-muted);text-align:center;padding:40px;line-height:1.6}

@media (max-width:820px){
  .board{grid-template-columns:1fr;overflow-y:auto}
  .col{min-height:220px}
  .topbar{flex-wrap:wrap;gap:10px}
}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:var(--surface-strong);border-radius:4px}