:root{
  --ink:#12151c;
  --paper:#eef0f3;
  --panel:#ffffff;
  --panel-2:#e4e7ec;
  --graphite:#4b5468;
  --graphite-soft:#7c8496;
  --blueprint:#2f63e8;
  --blueprint-dim:#dbe4fb;
  --amber:#c8842a;
  --amber-dim:#f6e6cc;
  --teal:#1f7a70;
  --teal-dim:#d9efec;
  --red:#b6453f;
  --red-dim:#f5dfdd;
  --line:#c7ccd5;
  --line-soft:#dde1e7;
  --radius:3px;
  --font-display:'Space Grotesk',sans-serif;
  --font-body:'Inter',sans-serif;
  --font-mono:'IBM Plex Mono',monospace;
  --shadow-card:0 1px 2px rgba(18,21,28,.06),0 1px 0 rgba(18,21,28,.04);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:var(--font-body);
  background:
    linear-gradient(var(--line-soft) 1px,transparent 1px) 0 0/100% 28px,
    var(--paper);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
}
.hidden{display:none !important}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit}
a{color:var(--blueprint)}

/* ============ LOGIN ============ */
.login-screen{
  min-height:100vh;
  display:flex;align-items:center;justify-content:center;
  padding:32px;
}
.login-card{
  width:100%;max-width:460px;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:4px;
  padding:36px 34px 28px;
  box-shadow:var(--shadow-card);
}
.login-mark{display:flex;justify-content:space-between;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.04em;color:var(--graphite-soft);border-bottom:1px solid var(--line);padding-bottom:14px;margin-bottom:22px;}
.login-card h1{font-family:var(--font-display);font-size:26px;line-height:1.2;font-weight:600;margin:0 0 6px;}
.login-card h1 span{color:var(--blueprint)}
.login-sub{color:var(--graphite);font-size:14px;margin:0 0 22px;}
.profile-list{display:flex;flex-direction:column;gap:8px;margin-bottom:14px;max-height:260px;overflow-y:auto;}
.profile-item{
  display:flex;align-items:center;gap:12px;
  border:1px solid var(--line);border-radius:var(--radius);
  padding:10px 12px;background:var(--paper);
  transition:border-color .15s;
}
.profile-item:hover{border-color:var(--blueprint)}
.profile-avatar{
  width:32px;height:32px;border-radius:50%;
  background:var(--blueprint-dim);color:var(--blueprint);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-weight:600;font-size:13px;flex-shrink:0;
}
.profile-meta{flex:1;min-width:0}
.profile-name{font-weight:600;font-size:13.5px}
.profile-role{font-size:11.5px;color:var(--graphite-soft);font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.03em;}
.profile-item button{border:1px solid var(--blueprint);background:var(--blueprint);color:#fff;font-size:12px;padding:6px 12px;border-radius:var(--radius);font-weight:600;}
.login-add{margin:6px 0 4px}
.add-profile-form{display:flex;flex-direction:column;gap:8px;margin-top:10px;padding-top:14px;border-top:1px dashed var(--line);}
.add-profile-form input,.add-profile-form select{padding:9px 10px;border:1px solid var(--line);border-radius:var(--radius);font-size:13.5px;background:var(--paper);}
.form-row{display:flex;gap:8px;margin-top:2px}
.login-footnote{font-size:11.5px;color:var(--graphite-soft);margin:20px 0 0;line-height:1.5;}

/* ============ BUTTONS ============ */
.btn{border-radius:var(--radius);padding:8px 14px;font-size:13px;font-weight:600;border:1px solid transparent;}
.btn-primary{background:var(--blueprint);color:#fff;}
.btn-primary:hover{background:#2453c9}
.btn-ghost{background:transparent;border:1px solid var(--line);color:var(--graphite)}
.btn-ghost:hover{border-color:var(--graphite)}
.btn-sm{padding:5px 10px;font-size:12px}
.btn-amber{background:var(--amber);color:#fff}
.btn-danger{background:transparent;color:var(--red);border:1px solid var(--red-dim)}

/* ============ APP SHELL ============ */
.app-shell{display:flex;min-height:100vh;}
.sidebar{
  width:238px;flex-shrink:0;
  background:var(--ink);color:#dfe3ea;
  display:flex;flex-direction:column;
  position:sticky;top:0;height:100vh;
}
.sidebar-title{padding:22px 20px 16px;border-bottom:1px solid #262b36;}
.sidebar-doc{display:block;font-family:var(--font-mono);font-size:10.5px;color:#7d8aab;letter-spacing:.05em;margin-bottom:4px;}
.sidebar-project{display:block;font-family:var(--font-display);font-size:15.5px;font-weight:600;color:#fff;}
.sheet-nav{flex:1;overflow-y:auto;padding:10px 0;}
.sheet-item{
  width:100%;display:flex;align-items:center;gap:10px;
  background:transparent;border:none;color:#b7bfd0;
  padding:10px 20px;font-size:13.5px;text-align:left;
  border-left:3px solid transparent;
}
.sheet-item em{font-family:var(--font-mono);font-style:normal;font-size:11px;color:#6d7690;width:16px;}
.sheet-item:hover{background:#1a1f2a;color:#fff}
.sheet-item.active{background:#1a1f2a;color:#fff;border-left-color:var(--blueprint);}
.sheet-item.active em{color:var(--blueprint)}
.sidebar-user{padding:16px 20px;border-top:1px solid #262b36;font-size:12.5px;}
.sidebar-user .su-name{color:#fff;font-weight:600;display:block}
.sidebar-user .su-role{color:#7d8aab;font-family:var(--font-mono);font-size:10.5px;text-transform:uppercase;}
.sidebar-user button{background:none;border:none;color:#7d8aab;font-size:11.5px;padding:0;margin-top:8px;text-decoration:underline;}

.main-col{flex:1;min-width:0;display:flex;flex-direction:column;}

.title-block{
  display:flex;align-items:stretch;
  background:var(--panel);border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:5;
}
.tb-cell{padding:12px 20px;border-right:1px solid var(--line-soft);display:flex;flex-direction:column;justify-content:center;gap:2px;}
.tb-label{font-family:var(--font-mono);font-size:9.5px;text-transform:uppercase;letter-spacing:.06em;color:var(--graphite-soft);}
.tb-value{font-size:13.5px;font-weight:600;}
.tb-project{min-width:200px}
.tb-sheet .tb-value{color:var(--blueprint)}
.tb-rev .tb-value,.tb-date .tb-value{font-family:var(--font-mono);font-weight:500;font-size:12.5px;}
.tb-alerts{margin-left:auto;border-right:none;justify-content:center;padding-right:20px;}
.bell-btn{position:relative;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:8px 14px;font-size:12.5px;font-weight:600;color:var(--graphite);}
.alert-count{background:var(--red);color:#fff;font-family:var(--font-mono);font-size:10.5px;border-radius:20px;padding:1px 6px;margin-left:6px;}

.alert-panel{
  background:#fff;border-bottom:1px solid var(--line);
  padding:14px 28px;display:flex;flex-direction:column;gap:8px;
  max-height:280px;overflow-y:auto;
}
.alert-row{display:flex;align-items:flex-start;gap:10px;font-size:13px;padding:8px 10px;border-radius:var(--radius);background:var(--paper);}
.alert-tag{font-family:var(--font-mono);font-size:9.5px;text-transform:uppercase;padding:2px 6px;border-radius:2px;flex-shrink:0;margin-top:1px;}
.alert-tag.overdue{background:var(--red-dim);color:var(--red)}
.alert-tag.upcoming{background:var(--amber-dim);color:var(--amber)}
.alert-tag.info{background:var(--blueprint-dim);color:var(--blueprint)}

.content{padding:28px 32px 60px;max-width:1280px;}

/* ============ SHARED PANEL/CARD ============ */
.panel-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:18px;flex-wrap:wrap;gap:10px;}
.panel-head h2{font-family:var(--font-display);font-size:21px;margin:0 0 4px;font-weight:600;}
.panel-head p{margin:0;color:var(--graphite);font-size:13px;}
.eyebrow{font-family:var(--font-mono);font-size:10.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--blueprint);margin:0 0 4px;}

.card{background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:18px 20px;box-shadow:var(--shadow-card);margin-bottom:16px;}
.card-title{font-weight:600;font-size:14px;margin:0 0 10px;display:flex;justify-content:space-between;align-items:center;}

.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
@media(max-width:1000px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

.stat-card{background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:16px 18px;}
.stat-num{font-family:var(--font-mono);font-size:26px;font-weight:600;}
.stat-label{font-size:11.5px;color:var(--graphite-soft);text-transform:uppercase;letter-spacing:.04em;font-family:var(--font-mono);margin-top:4px;}
.stat-card.risk .stat-num{color:var(--red)}
.stat-card.ok .stat-num{color:var(--teal)}
.stat-card.watch .stat-num{color:var(--amber)}

table{width:100%;border-collapse:collapse;font-size:13px;}
th{text-align:left;font-family:var(--font-mono);font-size:10.5px;text-transform:uppercase;letter-spacing:.04em;color:var(--graphite-soft);padding:8px 10px;border-bottom:1px solid var(--line);}
td{padding:10px;border-bottom:1px solid var(--line-soft);vertical-align:top;}
tr:last-child td{border-bottom:none}

.badge{display:inline-block;font-family:var(--font-mono);font-size:10px;text-transform:uppercase;padding:2px 7px;border-radius:2px;font-weight:600;letter-spacing:.02em;}
.badge.on-track{background:var(--teal-dim);color:var(--teal)}
.badge.at-risk{background:var(--amber-dim);color:var(--amber)}
.badge.overdue{background:var(--red-dim);color:var(--red)}
.badge.done{background:var(--blueprint-dim);color:var(--blueprint)}
.badge.open{background:var(--panel-2);color:var(--graphite)}

.tag-chip{display:inline-block;background:var(--panel-2);color:var(--graphite);font-size:11px;padding:2px 8px;border-radius:12px;margin:2px 4px 2px 0;}

.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px;}
.form-grid.full{grid-template-columns:1fr}
.field{display:flex;flex-direction:column;gap:4px;}
.field label{font-size:11.5px;font-weight:600;color:var(--graphite);}
.field input,.field select,.field textarea{border:1px solid var(--line);border-radius:var(--radius);padding:8px 10px;font-size:13px;background:#fff;}
.field textarea{resize:vertical;min-height:60px;}
.field-file{border:1px dashed var(--line);border-radius:var(--radius);padding:10px;font-size:12.5px;background:var(--paper);}

.file-chip{display:inline-flex;align-items:center;gap:6px;background:var(--paper);border:1px solid var(--line);border-radius:20px;padding:3px 10px 3px 4px;font-size:11.5px;margin:2px 4px 2px 0;}
.file-chip .fi{width:16px;height:16px;background:var(--blueprint-dim);color:var(--blueprint);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:9px;font-weight:700;}

.empty-state{border:1px dashed var(--line);border-radius:4px;padding:34px 20px;text-align:center;color:var(--graphite-soft);font-size:13px;}
.empty-state strong{display:block;color:var(--ink);font-size:14px;margin-bottom:4px;font-family:var(--font-display);}

/* ============ REVISION TABLE (change history signature) ============ */
.rev-table{border:1px solid var(--line);border-radius:4px;overflow:hidden;background:#fff;}
.rev-table table{font-size:12.5px;}
.rev-table th{background:var(--panel-2);}
.rev-letter{font-family:var(--font-mono);font-weight:700;color:var(--blueprint);}

/* ============ GANTT ============ */
.gantt-wrap{border:1px solid var(--line);border-radius:4px;background:#fff;overflow-x:auto;}
.gantt-scale{display:flex;font-family:var(--font-mono);font-size:10px;color:var(--graphite-soft);border-bottom:1px solid var(--line);position:sticky;top:0;background:#fff;}
.gantt-scale span{flex-shrink:0;padding:8px 0;text-align:center;border-right:1px solid var(--line-soft);}
.gantt-row{display:flex;align-items:center;border-bottom:1px solid var(--line-soft);min-height:40px;position:relative;}
.gantt-row:hover{background:var(--paper)}
.gantt-label{width:220px;flex-shrink:0;padding:0 12px;font-size:12.5px;font-weight:600;position:sticky;left:0;background:inherit;border-right:1px solid var(--line);}
.gantt-track{position:relative;flex:1;height:40px;}
.gantt-bar{position:absolute;top:8px;height:24px;border-radius:3px;background:var(--blueprint);cursor:pointer;display:flex;align-items:center;padding:0 8px;font-size:10.5px;color:#fff;font-weight:600;white-space:nowrap;overflow:hidden;box-shadow:0 1px 2px rgba(0,0,0,.15);}
.gantt-bar.at-risk{background:var(--amber);background-image:repeating-linear-gradient(45deg,rgba(255,255,255,.25) 0 6px,transparent 6px 12px);}
.gantt-bar.overdue{background:var(--red);}
.gantt-bar.done{background:var(--teal);}
.gantt-grid-lines{position:absolute;inset:0;background-image:repeating-linear-gradient(to right,var(--line-soft) 0,var(--line-soft) 1px,transparent 1px,transparent var(--col-w,32px));}

/* ============ TABS/PILLS ============ */
.pill-tabs{display:flex;gap:6px;margin-bottom:16px;flex-wrap:wrap;}
.pill{border:1px solid var(--line);background:#fff;padding:6px 13px;border-radius:20px;font-size:12.5px;font-weight:600;color:var(--graphite);}
.pill.active{background:var(--ink);color:#fff;border-color:var(--ink);}

/* ============ AI PANEL ============ */
.ai-msg{background:var(--blueprint-dim);border-left:3px solid var(--blueprint);padding:12px 14px;border-radius:0 4px 4px 0;font-size:13px;margin-bottom:10px;}
.ai-idea{background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:12px 14px;margin-bottom:8px;font-size:13px;}
.ai-idea-tag{font-family:var(--font-mono);font-size:9.5px;text-transform:uppercase;color:var(--blueprint);margin-bottom:4px;display:block;}

.toast{position:fixed;bottom:24px;right:24px;background:var(--ink);color:#fff;padding:12px 18px;border-radius:4px;font-size:13px;box-shadow:0 4px 16px rgba(0,0,0,.25);z-index:50;}

.icon-btn{background:none;border:1px solid var(--line);border-radius:var(--radius);width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;font-size:13px;color:var(--graphite);}
.icon-btn:hover{border-color:var(--blueprint);color:var(--blueprint)}

.subsection{border-left:2px solid var(--line);margin:10px 0 0 8px;padding-left:16px;}

.follow-row{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px solid var(--line-soft);font-size:12.5px;}
.follow-row:last-child{border-bottom:none}

.modal-overlay{position:fixed;inset:0;background:rgba(18,21,28,.5);display:flex;align-items:center;justify-content:center;z-index:60;padding:20px;}
.modal-box{background:#fff;border-radius:5px;padding:26px 26px 20px;width:100%;max-width:460px;box-shadow:0 10px 40px rgba(0,0,0,.3);}
.gantt-drawer{background:var(--paper);}

@media(max-width:900px){
  .app-shell{flex-direction:column;}
  .sidebar{width:100%;height:auto;position:relative;top:auto;}
  .sheet-nav{display:flex;overflow-x:auto;padding:6px 10px;}
  .sheet-item{flex-shrink:0;border-left:none;border-bottom:3px solid transparent;padding:10px 14px;white-space:nowrap;}
  .sheet-item.active{border-left:none;border-bottom-color:var(--blueprint);}
  .sidebar-user{display:none}
  .content{padding:20px 16px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .title-block{flex-wrap:wrap}
  .gantt-label{width:150px;}
}