:root{--navy:#17365d;--blue:#2d5f8b;--bg:#f4f7fb;--line:#d8e0e9;--text:#1d2733;--green:#1b7f5a;--red:#a33;--amber:#9b6b00}
*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}a{color:#185d93;text-decoration:none}a:hover{text-decoration:underline}
.topbar{background:var(--navy);color:white;padding:12px 22px;display:flex;align-items:center;gap:22px;position:sticky;top:0;z-index:2}.brand{font-weight:700;letter-spacing:.5px}.topbar a{color:white}.spacer{flex:1}.container{max-width:1280px;margin:22px auto;padding:0 18px}.card{background:white;border:1px solid var(--line);border-radius:10px;padding:18px;margin:14px 0;box-shadow:0 2px 8px #17365d0d}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.btn{display:inline-block;border:0;border-radius:7px;padding:9px 13px;background:var(--blue);color:white;cursor:pointer;font-weight:600}.btn:hover{text-decoration:none;filter:brightness(.95)}.btn.secondary{background:#596777}.btn.good{background:var(--green)}.btn.danger{background:var(--red)}.btn.warn{background:var(--amber)}button:disabled{opacity:.5;cursor:not-allowed}
input,select,textarea{width:100%;padding:9px;border:1px solid #b8c5d1;border-radius:6px;font:inherit;background:white}textarea{min-height:110px}.editor{min-height:540px;font-family:"Segoe UI",Arial,sans-serif;line-height:1.58;font-size:16px}.editor-vi{unicode-bidi:plaintext;letter-spacing:normal;word-spacing:normal}.editor-status{margin-top:6px}.label{font-weight:700;margin:9px 0 5px}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.row>*{flex:1}.row .auto{flex:0 0 auto}
.table{width:100%;border-collapse:collapse}.table th,.table td{border-bottom:1px solid var(--line);padding:9px;text-align:left;vertical-align:top}.table th{background:#edf3f9}.badge{display:inline-block;padding:4px 7px;border-radius:999px;background:#e7eef6;font-size:.82rem;font-weight:700}.badge.good{background:#dff4e9;color:#145f43}.badge.warn{background:#fff0c8;color:#755000}.badge.bad{background:#f8dddd;color:#812b2b}.muted{color:#667383}.flash{padding:11px 14px;border-radius:7px;margin-bottom:14px;background:#e9f3ff}.flash.success{background:#e0f5e8}.flash.danger{background:#f8dddd}.phase{font-size:.9rem}.progress{height:10px;background:#e6ebf0;border-radius:999px;overflow:hidden}.progress span{display:block;height:100%;background:var(--blue)}pre{white-space:pre-wrap;background:#f7f9fb;border:1px solid var(--line);padding:12px;border-radius:7px}.split{display:grid;grid-template-columns:1fr 1fr;gap:14px}.notice{border-left:4px solid var(--blue);padding:9px 12px;background:#eef5fb}.small{font-size:.88rem}@media(max-width:800px){.grid2,.split{grid-template-columns:1fr}.topbar{flex-wrap:wrap}.container{margin-top:12px}}

/* Phân công cộng tác nhiều người */
.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}
.checkline{display:block;padding:.35rem .2rem;line-height:1.35}
.checkline input{width:auto;margin-right:.4rem}
@media(max-width:900px){.grid3{grid-template-columns:1fr}}

/* RC13.3 — assignment coordination must remain obvious after initial assignment */
.assignment-table .assignment-actions{min-width:210px;vertical-align:top}
.manage-assignment-btn{display:inline-block;white-space:nowrap;margin-bottom:6px}
.assignment-control-notice{margin:14px 0}
.project-role-line{margin-top:8px;display:flex;gap:6px;align-items:center;flex-wrap:wrap}

/* RC13.4 — điều phối nhiều người bằng thao tác thêm/rút rõ ràng */
.assignment-role-card{margin:0;min-width:0}
.participant-list{display:flex;flex-direction:column;gap:8px;margin:8px 0 14px}
.participant-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:9px 10px;border:1px solid var(--line);border-radius:7px;background:#fafcff}
.participant-action-form{margin:0;flex:0 0 auto}
.participant-add-form{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:center}
.participant-add-form select{min-width:0}
.small-btn{padding:6px 9px;font-size:.86rem}
.checkline{display:flex;align-items:flex-start;gap:.45rem;padding:.4rem .2rem;line-height:1.35;cursor:pointer}
.checkline input[type="checkbox"]{width:18px!important;height:18px!important;min-width:18px;flex:0 0 18px;margin:1px 0 0 0;padding:0}
.checkline>span{flex:1;min-width:0}
@media(max-width:900px){.participant-add-form{grid-template-columns:1fr}.participant-add-form .btn{width:100%}}

.project-card-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.danger-zone{border-color:#e1a0a0}.delete-warning{border-left-color:var(--red);background:#fff1f1}.delete-confirm-actions{gap:12px;align-items:center}.delete-confirm-actions form{margin:0}

.tracking-note{margin-bottom:.7rem;padding-bottom:.55rem;border-bottom:1px solid #e1e8ef}.tracking-note:last-child{border-bottom:0;margin-bottom:0;padding-bottom:0}