:root {
  --es-blue: #005CA1;
  --es-blue-dark: #00426F;
  --es-gray: #838280;
  --es-orange: #F0AA1D;
  --bg: #F4F6F8;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Montserrat', Arial, sans-serif;
  background: var(--bg);
  color: #1f2937;
}

#login-screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--es-blue-dark), var(--es-blue));
  color: #fff;
  gap: 20px;
  text-align: center;
  padding: 24px;
}
#login-screen h1 { font-weight: 800; font-size: 26px; margin: 0; }
#login-screen p { color: #cfe3f2; margin: 0; max-width: 320px; }
#login-error { color: #ffd7d7; font-size: 13px; min-height: 18px; }

.app-shell { display: none; min-height: 100vh; flex-direction: column; }

header.topbar {
  background: var(--es-blue-dark);
  color: #fff;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
header.topbar .brand { font-weight: 800; letter-spacing: .5px; }
header.topbar .brand span { color: var(--es-orange); }
.user-chip { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.user-chip img { width: 28px; height: 28px; border-radius: 50%; }
.logout-btn { background: none; border: 1px solid #ffffff55; color: #fff; border-radius: 6px; padding: 4px 10px; font-size: 12px; cursor: pointer; }

nav.tabs {
  display: flex;
  background: var(--es-blue);
  overflow-x: auto;
}
nav.tabs button {
  background: none; border: none; color: #ffffffcc; padding: 12px 16px;
  font-family: inherit; font-size: 13px; font-weight: 600; cursor: pointer; white-space: nowrap;
  border-bottom: 3px solid transparent;
}
nav.tabs button.active { color: #fff; border-bottom-color: var(--es-orange); }

main { flex: 1; padding: 16px; max-width: 900px; margin: 0 auto; width: 100%; }
.view { display: none; }
.view.active { display: block; }

.card {
  background: #fff; border-radius: 10px; padding: 16px; margin-bottom: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,.08);
}

.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 16px; }
.stat-card { background: #fff; border-radius: 10px; padding: 14px; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.stat-card .num { font-size: 24px; font-weight: 800; color: var(--es-blue-dark); }
.stat-card .label { font-size: 12px; color: var(--es-gray); margin-top: 2px; }

.task-card { border-left: 4px solid var(--es-gray); }
.task-card.p-cao { border-left-color: #d9534f; }
.task-card.p-trung_binh { border-left-color: var(--es-orange); }
.task-card.p-thap { border-left-color: #5cb85c; }
.task-card .row1 { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.task-card h3 { margin: 0 0 4px; font-size: 15px; }
.task-card .meta { font-size: 12px; color: var(--es-gray); margin-top: 6px; display: flex; gap: 10px; flex-wrap: wrap; }
.badge { font-size: 11px; padding: 2px 8px; border-radius: 20px; font-weight: 700; }
.badge.moi { background: #e6f0fa; color: var(--es-blue); }
.badge.dang_lam { background: #fff4dc; color: #a06a00; }
.badge.cho_duyet { background: #f1e6fb; color: #6a1fb0; }
.badge.hoan_thanh { background: #e6f7e8; color: #1a7f2e; }

.btn { background: var(--es-blue); color: #fff; border: none; border-radius: 8px; padding: 10px 16px; font-family: inherit; font-weight: 700; font-size: 13px; cursor: pointer; }
.btn.orange { background: var(--es-orange); color: #4a2f00; }
.btn.ghost { background: none; border: 1px solid var(--es-gray); color: var(--es-gray); }
.btn.small { padding: 6px 10px; font-size: 12px; }
.fab { position: fixed; right: 18px; bottom: 18px; width: 54px; height: 54px; border-radius: 50%; font-size: 26px; box-shadow: 0 4px 10px rgba(0,0,0,.25); }

input, select, textarea {
  width: 100%; padding: 10px; border: 1px solid #dcdfe3; border-radius: 8px; font-family: inherit; font-size: 14px; margin-bottom: 10px;
}
label { font-size: 12px; font-weight: 700; color: var(--es-gray); display: block; margin-bottom: 4px; }

.modal-backdrop {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 50;
  align-items: flex-end; justify-content: center;
}
.modal-backdrop.active { display: flex; }
.modal { background: #fff; border-radius: 14px 14px 0 0; padding: 20px; width: 100%; max-width: 480px; max-height: 88vh; overflow-y: auto; }
.modal h2 { margin-top: 0; color: var(--es-blue-dark); font-size: 17px; }
.modal-actions { display: flex; gap: 8px; margin-top: 10px; }

.chat-layout { display: flex; height: calc(100vh - 150px); background: #fff; border-radius: 10px; overflow: hidden; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.room-list { width: 130px; border-right: 1px solid #eee; overflow-y: auto; flex-shrink: 0; }
.room-list .room-item { padding: 12px 10px; font-size: 13px; cursor: pointer; border-bottom: 1px solid #f4f4f4; }
.room-list .room-item.active { background: var(--es-blue); color: #fff; font-weight: 700; }
.chat-main { flex: 1; display: flex; flex-direction: column; }
.chat-messages { flex: 1; overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 8px; }
.msg { max-width: 75%; padding: 8px 12px; border-radius: 12px; font-size: 13px; background: #f0f2f5; }
.msg .sender { font-size: 11px; font-weight: 700; color: var(--es-blue); margin-bottom: 2px; }
.msg.mine { align-self: flex-end; background: var(--es-blue); color: #fff; }
.msg.mine .sender { display: none; }
.chat-input { display: flex; gap: 8px; padding: 10px; border-top: 1px solid #eee; }
.chat-input input { margin: 0; }

.emp-row { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-bottom: 1px solid #f0f0f0; font-size: 13px; }
.emp-row .name { font-weight: 700; }
.emp-row .email { color: var(--es-gray); font-size: 12px; }
.tag-admin { background: var(--es-orange); color: #4a2f00; font-size: 10px; padding: 2px 6px; border-radius: 6px; margin-left: 6px; }

.empty { text-align: center; color: var(--es-gray); padding: 30px 0; font-size: 13px; }