:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-bg: #f4f6f9;
  --color-card: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #0f172a;
  --color-muted: #64748b;

  --color-pending: #d97706;
  --color-pending-bg: #fef3c7;
  --color-completed: #16a34a;
  --color-completed-bg: #dcfce7;
  --color-overdue: #dc2626;
  --color-overdue-bg: #fee2e2;
  --color-future: #2563eb;
  --color-future-bg: #dbeafe;

  --radius: 10px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

.hidden { display: none !important; }

/* ---------- Login ---------- */
.login {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1d4ed8, #0f172a);
}
.login__card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 32px;
  width: 100%;
  max-width: 360px;
}
.login__brand {
  font-weight: 700;
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 4px;
}
.login__title {
  color: var(--color-muted);
  margin-bottom: 20px;
}

/* ---------- Inputs / buttons ---------- */
.input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 12px;
  background: #fff;
  color: var(--color-text);
}
.input:focus { outline: none; border-color: var(--color-primary); }

.btn {
  padding: 10px 16px;
  border-radius: 8px;
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-dark); }
.btn--ghost { background: transparent; color: var(--color-primary); border: 1px solid var(--color-border); }
.btn--sm { padding: 6px 10px; font-size: 13px; }
.btn--block { width: 100%; }

.error {
  color: var(--color-overdue);
  font-size: 13px;
  margin-top: 8px;
}
.message { margin-top: 10px; font-size: 13px; }
.message--ok { color: var(--color-completed); }
.message--err { color: var(--color-overdue); }

/* ---------- Layout ---------- */
.app { min-height: 100vh; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
}
.topbar__brand { font-weight: 700; color: var(--color-primary); font-size: 18px; }
.topbar__user { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--color-muted); }

.tabs { display: flex; gap: 4px; }
.tab {
  padding: 8px 16px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  color: var(--color-muted);
  font-weight: 500;
}
.tab.active { background: var(--color-primary); color: #fff; }

.tab-panel { padding: 24px; max-width: 1200px; margin: 0 auto; }

.grid-2 { display: grid; grid-template-columns: 2fr 1fr; gap: 20px; margin-bottom: 20px; }
@media (max-width: 800px) { .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 20px;
}
.card__title { font-weight: 700; margin-bottom: 14px; font-size: 15px; }
.card__actions { display: flex; gap: 10px; margin-top: 8px; }

.field-row { display: flex; gap: 12px; }
.field-row .field { flex: 1; }
.field label { display: block; font-size: 13px; color: var(--color-muted); margin-bottom: 4px; }

/* ---------- Stats ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}
.stat-card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  text-align: center;
}
.stat-label { font-size: 12px; color: var(--color-muted); text-transform: uppercase; letter-spacing: .04em; }
.stat-number { font-size: 28px; font-weight: 700; margin-top: 4px; }
.stat-number--pending { color: var(--color-pending); }
.stat-number--completed { color: var(--color-completed); }
.stat-number--overdue { color: var(--color-overdue); }

/* ---------- Table ---------- */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

/* ---------- Gantt grid ---------- */
.gantt-wrap { overflow-x: auto; }
.gantt { border-collapse: collapse; width: 100%; min-width: 900px; }
.gantt th, .gantt td {
  border: 1px solid var(--color-border);
  padding: 6px 8px;
  font-size: 13px;
  vertical-align: top;
  min-width: 70px;
}
.gantt th { background: #f8fafc; text-align: center; }
.gantt td.machine-cell { font-weight: 600; background: #f8fafc; white-space: nowrap; }
.gantt td.month-cell { min-height: 40px; }
.gantt td.month-cell.drag-over { background: var(--color-future-bg); }

.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  margin: 2px 2px;
  cursor: default;
}
.badge--pending { background: var(--color-pending-bg); color: var(--color-pending); cursor: grab; }
.badge--completed { background: var(--color-completed-bg); color: var(--color-completed); }
.badge--overdue { background: var(--color-overdue-bg); color: var(--color-overdue); cursor: grab; }
.badge--future { background: var(--color-future-bg); color: var(--color-future); }

.legend { margin-top: 12px; display: flex; gap: 10px; }

.preview {
  background: #f8fafc;
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 12px;
  font-size: 13px;
}
.preview ul { margin: 6px 0 0; padding-left: 18px; }

/* ---------- Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal__card {
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 24px;
  width: 100%;
  max-width: 380px;
}
.modal__title { font-weight: 700; margin-bottom: 10px; }
.modal__summary { font-size: 13px; color: var(--color-muted); margin-bottom: 14px; }