:root{
  --bg:#f6f7f9; --panel:#fff; --ink:#1f2430; --ink-soft:#5b6472; --muted:#8a93a3;
  --line:#e6e9ef; --line-strong:#d3d8e2; --accent:#3b5bdb; --accent-soft:#e7ecff;
  --ok:#16a34a; --bad:#ef4444; --shadow:0 8px 30px rgba(24,32,52,.14);
  --side:236px;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Segoe UI",Roboto,Helvetica,Arial,sans-serif;font-size:13px}
.view{min-height:100vh}
[hidden]{display:none!important}
.spacer{flex:1}

.btn{border:1px solid var(--line-strong);background:var(--panel);color:var(--ink);border-radius:9px;padding:7px 12px;font-size:12.5px;font-weight:600;cursor:pointer;font-family:inherit}
.btn:hover{border-color:var(--accent);color:var(--accent)}
.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn.primary:hover{background:#2f4bc4;color:#fff}
.btn.block{width:100%;padding:11px;font-size:14px;margin-top:6px}
.btn.small{padding:5px 9px;font-size:11.5px}
.btn.danger{color:var(--bad);border-color:#f3c8c8}
.btn.danger:hover{background:#fdecec;border-color:var(--bad);color:var(--bad)}
.form-err{color:var(--bad);font-size:12px;font-weight:600;min-height:16px;margin:6px 0}

/* login */
.login-view{display:flex;align-items:center;justify-content:center;padding:24px}
.login-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:30px;width:360px}
.login-logo{font-size:38px;text-align:center}
.login-card h1{font-size:19px;text-align:center;margin:6px 0 2px}
.login-sub{text-align:center;color:var(--muted);font-size:12px;margin:0 0 20px}
.login-card label{display:block;font-size:12px;font-weight:700;color:var(--ink-soft);margin:12px 0 5px}
.login-card input{width:100%;border:1px solid var(--line-strong);border-radius:9px;padding:11px 12px;font-size:14px;font-family:inherit}
.login-card input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}

/* app layout */
.app-view{display:flex;min-height:100vh}
.sidebar{width:var(--side);flex:none;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.side-brand{font-weight:800;font-size:16px;padding:18px 18px 14px}
.side-nav{flex:1;padding:6px 10px;display:flex;flex-direction:column;gap:3px}
.nav-item{display:block;width:100%;text-align:left;border:none;background:transparent;color:var(--ink-soft);font-size:13.5px;font-weight:600;padding:10px 12px;border-radius:9px;cursor:pointer;font-family:inherit}
.nav-item:hover{background:#f2f4f8;color:var(--ink)}
.nav-item.active{background:var(--accent-soft);color:var(--accent)}
.side-user{display:flex;align-items:center;gap:9px;padding:12px;border-top:1px solid var(--line)}
.su-avatar{width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;flex:none}
.su-info{flex:1;min-width:0}
.su-name{font-size:13px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.su-role{font-size:10.5px;color:var(--muted)}

.content{flex:1;min-width:0}
.pane{padding:22px 26px}
.board-pane{padding:0;display:flex;flex-direction:column;min-height:100vh}
.pane-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
.pane-head h1{font-size:20px;margin:0}
.pane-actions{display:flex;gap:8px}

/* project cards */
.proj-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.proj-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px 16px 14px;cursor:pointer;transition:.12s;position:relative;overflow:hidden}
.proj-card:hover{border-color:var(--accent);box-shadow:var(--shadow);transform:translateY(-2px)}
.proj-card .pc-bar{position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--accent)}
.proj-card.shared .pc-bar{background:#ec4899}
.proj-card h3{margin:0 0 10px;font-size:15px;padding-left:6px;line-height:1.35}
.pc-meta{display:flex;align-items:center;gap:8px;padding-left:6px;flex-wrap:wrap}
.pc-badge{font-size:10.5px;font-weight:700;padding:2px 8px;border-radius:6px}
.pc-badge.own{background:var(--accent-soft);color:var(--accent)}
.pc-badge.shared{background:#fde7f3;color:#be1d6b}
.pc-date{font-size:11px;color:var(--muted)}
.pc-open{margin-top:12px;padding-left:6px;font-size:12px;color:var(--accent);font-weight:600}
.empty-block{color:var(--muted);font-size:14px;padding:40px 0;text-align:center}

/* board detail */
.board-head{display:flex;align-items:center;gap:10px;padding:12px 18px;background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.board-title{font-size:15px;font-weight:800;max-width:40vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.save-state{font-size:11.5px;color:var(--muted)}
.save-state.saving{color:var(--accent)} .save-state.saved{color:var(--ok)}
.board-frame-wrap{flex:1}
#boardFrame{width:100%;border:0;display:block;min-height:calc(100vh - 56px)}

/* settings / panels */
.panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 20px;max-width:760px;margin-bottom:16px}
.panel h2{font-size:15px;margin:0 0 10px}
.hint{color:var(--muted);font-size:12px;margin:0 0 12px}
.form-row{display:flex;align-items:center;gap:12px;margin-bottom:12px;max-width:420px}
.form-row label{width:60px;font-size:12.5px;font-weight:700;color:var(--ink-soft);flex:none}
.form-row input{flex:1;border:1px solid var(--line-strong);border-radius:9px;padding:9px 11px;font-size:13px;font-family:inherit}
.form-row input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.add-user{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:6px}
.add-user input{border:1px solid var(--line-strong);border-radius:9px;padding:9px 11px;font-size:13px;font-family:inherit}
.add-user #nuEmail{flex:2;min-width:180px}.add-user #nuName{flex:1;min-width:110px}.add-user #nuPassword{flex:1;min-width:110px}
.tbl{width:100%;border-collapse:collapse;font-size:13px;margin-top:8px}
.tbl th,.tbl td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line)}
.tbl th{font-size:11.5px;color:var(--muted);font-weight:700}
.tag{display:inline-block;font-size:10.5px;font-weight:700;padding:2px 8px;border-radius:6px;background:#eef1f5;color:var(--ink-soft)}
.tag.admin{background:var(--accent-soft);color:var(--accent)}

/* modal */
.backdrop{position:fixed;inset:0;background:rgba(20,26,40,.42);z-index:100;display:flex;align-items:flex-start;justify-content:center;padding:60px 16px;overflow:auto}
.modal{background:var(--panel);border-radius:16px;box-shadow:var(--shadow);width:100%;max-width:440px;overflow:hidden}
.modal h3{margin:0;padding:16px 20px;font-size:15px;border-bottom:1px solid var(--line)}
.mbody{padding:16px 20px;display:flex;flex-direction:column;gap:12px}
.mbody label{font-size:12px;font-weight:700;color:var(--ink-soft);margin-bottom:-6px}
.mbody input,.mbody select{border:1px solid var(--line-strong);border-radius:9px;padding:9px 11px;font-size:13px;font-family:inherit}
.mbody input:focus,.mbody select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.share-row{display:flex;align-items:center;gap:8px;padding:8px 0;border-bottom:1px solid var(--line)}
.share-row .who{flex:1;font-size:13px}
.share-row .who small{color:var(--muted)}
.share-add{display:flex;gap:8px}
.share-add select{flex:1}
.mfoot{display:flex;gap:10px;justify-content:flex-end;padding:14px 20px;border-top:1px solid var(--line)}
.empty{color:var(--muted);font-size:12.5px;padding:6px 0}

@media (max-width:720px){
  .app-view{flex-direction:column}
  .sidebar{width:100%;height:auto;position:static;flex-direction:row;align-items:center;overflow-x:auto}
  .side-nav{flex-direction:row}
  .board-title{max-width:30vw}
}