:root {
  --bg: #0f172a;           /* slate-900 */
  --panel: #111827;        /* gray-900 */
  --muted: #1f2937;        /* gray-800 */
  --text: #e5e7eb;         /* gray-200 */
  --text-dim: #9ca3af;     /* gray-400 */
  --brand: #6366f1;        /* indigo-500 */
  --accent: #22c55e;       /* green-500 */
  --danger: #ef4444;       /* red-500 */
  --warning: #f59e0b;      /* amber-500 */
  --shadow: 0 10px 25px rgba(0,0,0,.35);
  --radius: 18px;
}

.light {
  --bg: #f8fafc;          /* slate-50 */
  --panel: #ffffff;        /* white */
  --muted: #eef2f7;        /* slate-100/200 */
  --text: #0f172a;         /* slate-900 */
  --text-dim: #475569;     /* slate-600 */
  --brand: #4f46e5;
  --accent: #16a34a;
  --danger: #dc2626;
  --warning: #d97706;
  --shadow: 0 10px 30px rgba(2,6,23,.08);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; 
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: linear-gradient(135deg, var(--bg), var(--bg)); 
  color: var(--text);
  overflow: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* App Shell */
.app {
  display: grid;
  grid-template-columns: 320px 1fr 360px;
  grid-template-rows: 64px 1fr;
  grid-template-areas:
    "sidebar header header"
    "sidebar main   details";
  height: 100vh; 
  gap: 20px; 
  padding: 20px;
}

.card {
  background: var(--panel); 
  border-radius: var(--radius); 
  box-shadow: var(--shadow);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}
.muted { background: var(--muted); }

/* Header */
header {
  grid-area: header; 
  padding: 12px 20px; 
  display: flex; 
  align-items: center; 
  justify-content: space-between; 
  gap: 16px;
}
.brand {
  display: flex; 
  align-items: center; 
  gap: 12px;
}
.brand-icon {
  width: 36px; 
  height: 36px; 
  display: grid; 
  place-items: center; 
  border-radius: 12px; 
  background: linear-gradient(135deg, var(--brand), #8b5cf6); 
  box-shadow: var(--shadow); 
  font-weight: 800;
}
.brand h1 {
  margin: 0; 
  font-size: 18px; 
  letter-spacing: .4px;
}
.controls {
  display: flex; 
  gap: 10px; 
  align-items: center;
}
.btn {
  border: none; 
  padding: 10px 16px; 
  border-radius: 12px; 
  background: var(--muted); 
  color: var(--text); 
  cursor: pointer; 
  font-weight: 600;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.btn.primary { background: var(--brand); color: white; }
.btn.success { background: var(--accent); color: white; }
.btn.danger { background: var(--danger); color: white; }
.btn.ghost { background: transparent; border: 1px solid rgba(255,255,255,.08); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.chip {
  padding: 6px 12px; 
  border-radius: 999px; 
  background: var(--muted); 
  font-size: 12px;
  transition: background-color 0.3s ease;
}
.search { position: relative; }
.search input {
  width: 360px; 
  max-width: 38vw; 
  padding: 12px 14px 12px 40px; 
  border-radius: 12px; 
  border: none; 
  outline: none; 
  background: var(--muted); 
  color: var(--text);
  transition: background-color 0.3s ease, color 0.3s ease;
}
.search svg {
  position: absolute; 
  left: 12px; 
  top: 50%; 
  transform: translateY(-50%); 
  opacity: .6;
}

/* Sidebar */
aside {
  grid-area: sidebar; 
  padding: 16px; 
  display: flex; 
  flex-direction: column; 
  gap: 16px; 
  overflow: auto;
}
.section h3 {
  margin: 0 0 12px 8px; 
  font-size: 13px; 
  color: var(--text-dim); 
  text-transform: uppercase; 
  letter-spacing: .12em;
}
.list { display: flex; flex-direction: column; gap: 8px; }
.list .item {
  display: flex; 
  align-items: center; 
  gap: 12px; 
  padding: 12px; 
  border-radius: 12px; 
  cursor: pointer;
  transition: background-color 0.2s ease;
}
.list .item:hover { background: rgba(255,255,255,.05); }
.item .dot {
  width: 10px; 
  height: 10px; 
  border-radius: 50%; 
  background: var(--brand);
}
.item.active { background: linear-gradient(135deg, rgba(99,102,241,.18), rgba(139,92,246,.12)); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }

/* Main (Kanban + Calendar) */
main {
  grid-area: main; 
  padding: 16px; 
  overflow: auto; 
  display: flex; 
  flex-direction: column; 
  gap: 16px;
}
.tabs { display: flex; gap: 10px; }
.tab {
  padding: 12px 16px; 
  border-radius: 10px; 
  background: var(--muted); 
  cursor: pointer; 
  font-weight: 600;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.tab.active { background: var(--brand); color: white; }

.kanban {
  display: grid; 
  grid-template-columns: repeat(3, 1fr); 
  gap: 16px; 
  min-height: 420px;
}
.column {
  padding: 12px; 
  border-radius: 16px; 
  background: linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.01)); 
  border: 1px solid rgba(255,255,255,.06);
}
.column h4 {
  margin: 8px 8px 16px; 
  font-size: 14px; 
  color: var(--text-dim);
}
.dropzone {
  min-height: 200px; 
  display: flex; 
  flex-direction: column; 
  gap: 12px;
}

.task {
  padding: 14px; 
  border-radius: 14px; 
  background: var(--panel); 
  border: 1px solid rgba(255,255,255,.06); 
  box-shadow: var(--shadow); 
  cursor: grab;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.task.dragging { opacity: .5; transform: scale(0.98); }
.task .title { font-weight: 700; margin-bottom: 8px; }
.task .meta {
  display: flex; 
  gap: 10px; 
  flex-wrap: wrap; 
  align-items: center;
}
.badge {
  font-size: 11px; 
  padding: 4px 8px; 
  border-radius: 999px; 
  background: var(--muted);
}
.priority-high { background: rgba(239,68,68,.15); color: #fecaca; }
.priority-medium { background: rgba(245,158,11,.15); color: #fde68a; }
.priority-low { background: rgba(34,197,94,.15); color: #bbf7d0; }
.overdue { border: 1px dashed var(--danger); }

/* Calendar view */
.calendar { display: none; }
.calendar.active { display: grid; }
.calendar { grid-template-columns: repeat(7, 1fr); gap: 10px; }
.day {
  background: var(--panel); 
  border-radius: 14px; 
  padding: 12px; 
  min-height: 100px; 
  display: flex; 
  flex-direction: column; 
  gap: 8px; 
  border: 1px solid rgba(255,255,255,.06);
}
.day .num { font-weight: 700; opacity: .7; }
.day .count { margin-top: auto; font-size: 11px; opacity: .7; }

/* Details Panel */
.details {
  grid-area: details; 
  padding: 16px; 
  display: flex; 
  flex-direction: column; 
  gap: 16px; 
  overflow: auto;
}
.details .section { padding: 16px; border-radius: 16px; }
label { font-size: 12px; color: var(--text-dim); margin-bottom: 6px; display: block; }
input, select, textarea {
  width: 100%; 
  background: var(--muted); 
  color: var(--text); 
  border: none; 
  padding: 12px 14px; 
  border-radius: 12px; 
  outline: none;
  transition: background-color 0.3s ease, color 0.3s ease;
}
textarea { min-height: 80px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* Progress */
.progress {
  height: 10px; 
  background: var(--muted); 
  border-radius: 999px; 
  overflow: hidden;
}
.progress > span {
  display: block; 
  height: 100%; 
  background: linear-gradient(90deg, var(--accent), #10b981);
}

/* Modal */
.modal {
  position: fixed; 
  inset: 0; 
  background: rgba(0,0,0,.5); 
  display: none; 
  align-items: center; 
  justify-content: center;
  z-index: 1000;
}
.modal.active { display: flex; }
.modal .sheet {
  width: min(720px, 92vw); 
  background: var(--panel); 
  border-radius: 20px; 
  padding: 20px; 
  box-shadow: var(--shadow);
}

/* Small helpers */
.flex { display: flex; gap: 10px; align-items: center; }
.space { flex: 1; }
.right { margin-left: auto; }
.hidden { display: none; }
.sr {
  position: absolute; 
  width: 1px; 
  height: 1px; 
  padding: 0; 
  margin: -1px; 
  overflow: hidden; 
  clip: rect(0,0,0,0); 
  border: 0;
}

/* Delete button styles */
.delete-project {
  opacity: 0;
  transition: opacity 0.2s ease;
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
}

.list .item:hover .delete-project {
  opacity: 1;
}

.delete-project:hover {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
}

/* Dashboard specific styles */
.dashboard-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--muted);
  border-radius: 16px;
  padding: 16px;
  text-align: center;
}

.stat-value {
  font-size: 24px;
  font-weight: 700;
  margin: 8px 0;
}

.stat-label {
  font-size: 12px;
  color: var(--text-dim);
}

.charts-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.chart-card {
  background: var(--panel);
  border-radius: 16px;
  padding: 16px;
  border: 1px solid rgba(255,255,255,.06);
}

.chart-title {
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 16px;
  color: var(--text);
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-dim);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

@media (max-width: 1100px) {
  .app {
    grid-template-columns: 280px 1fr; 
    grid-template-areas:
      "header header"
      "sidebar main"
      "details details"; 
    grid-template-rows: 64px 1fr auto; 
    height: auto; 
    min-height: 100vh;
  }
  body { overflow: auto; }
}