/* ===== Kiểu chung cho toàn hệ thống ===== */
:root {
  --primary: #1f5c99;
  --primary-dark: #174571;
  --bg: #f3f6fa;
  --card: #ffffff;
  --border: #dbe3ec;
  --text: #1e293b;
  --muted: #64748b;
  --danger: #dc2626;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(15, 40, 70, .12);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14.5px;
  line-height: 1.5;
}
a { color: var(--primary); text-decoration: none; }

/* ===== Thanh điều hướng ===== */
.topbar {
  background: linear-gradient(90deg, var(--primary-dark), var(--primary));
  color: #fff;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 16px;
  height: 52px;
  box-shadow: var(--shadow);
  position: sticky; top: 0; z-index: 1100;
}
.topbar .brand {
  font-weight: 700; font-size: 15px; color: #fff; margin-right: 18px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.topbar .brand small { display: block; font-weight: 400; font-size: 10.5px; opacity: .85; }
.topbar nav { display: flex; gap: 2px; flex: 1; }
.topbar nav a {
  color: #e3edf7; padding: 6px 12px; border-radius: 6px; font-weight: 500; white-space: nowrap;
}
.topbar nav a:hover { background: rgba(255,255,255,.12); }
.topbar nav a.active { background: rgba(255,255,255,.22); color: #fff; }
.topbar .userbox { display: flex; align-items: center; gap: 8px; font-size: 13px; white-space: nowrap; }
.topbar .userbox a { color: #fff; }

/* ===== Khối, thẻ ===== */
.container { max-width: 1280px; margin: 0 auto; padding: 18px 16px; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px;
}
.card h2, .card h3 { margin-top: 0; }
.grid { display: grid; gap: 14px; }

/* ===== Nút ===== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--primary); color: #fff; border: none; cursor: pointer;
  padding: 7px 14px; border-radius: 6px; font-size: 14px; font-weight: 500;
  font-family: inherit;
}
.btn:hover { background: var(--primary-dark); }
.btn.secondary { background: #fff; color: var(--text); border: 1px solid var(--border); }
.btn.secondary:hover { background: #f1f5f9; }
.btn.danger { background: var(--danger); }
.btn.danger:hover { background: #b91c1c; }
.btn.small { padding: 4px 9px; font-size: 12.5px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* ===== Form ===== */
label.f { display: block; margin-bottom: 10px; font-weight: 600; font-size: 13px; color: #334155; }
label.f > input, label.f > select, label.f > textarea {
  display: block; width: 100%; margin-top: 4px;
  padding: 7px 9px; border: 1px solid var(--border); border-radius: 6px;
  font-size: 14px; font-family: inherit; background: #fff; color: var(--text);
}
label.f > textarea { resize: vertical; min-height: 64px; }
label.f > input:focus, label.f > select:focus, label.f > textarea:focus {
  outline: 2px solid #93b8dd; border-color: var(--primary);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; }
.form-row3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0 14px; }
@media (max-width: 720px) { .form-row, .form-row3 { grid-template-columns: 1fr; } }

/* ===== Bảng ===== */
table.tbl { width: 100%; border-collapse: collapse; background: #fff; }
table.tbl th, table.tbl td { padding: 8px 10px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
table.tbl th { background: #eef3f9; font-size: 12.5px; text-transform: uppercase; letter-spacing: .3px; color: #33506b; }
table.tbl tr:hover td { background: #f8fafc; }

/* ===== Nhãn trạng thái & thanh tiến độ ===== */
.badge {
  display: inline-block; padding: 2px 9px; border-radius: 99px;
  font-size: 12px; font-weight: 600; color: #fff; white-space: nowrap;
}
.progress { background: #e2e8f0; border-radius: 99px; height: 8px; min-width: 60px; overflow: hidden; }
.progress > div { height: 100%; border-radius: 99px; background: var(--primary); }
.progress-wrap { display: flex; align-items: center; gap: 8px; }
.progress-wrap span { font-size: 12px; color: var(--muted); min-width: 34px; }

/* ===== Hộp thoại ===== */
.modal-back {
  position: fixed; inset: 0; background: rgba(15, 30, 50, .5);
  display: none; align-items: flex-start; justify-content: center; z-index: 1200;
  padding: 30px 12px; overflow-y: auto;
}
.modal-back.open { display: flex; }
.modal {
  background: #fff; border-radius: 10px; box-shadow: 0 10px 40px rgba(0,0,0,.25);
  width: 100%; max-width: 760px; padding: 20px;
}
.modal.wide { max-width: 1000px; }
.modal h3 { margin: 0 0 14px; }
.modal .modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 14px; }

/* ===== Thông báo nổi ===== */
#toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: #1e293b; color: #fff; padding: 10px 18px; border-radius: 8px;
  font-size: 14px; display: none; z-index: 2000; box-shadow: 0 4px 16px rgba(0,0,0,.3);
  max-width: 90vw;
}
#toast.err { background: var(--danger); }

/* ===== Tab ===== */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--border); margin-bottom: 16px; flex-wrap: wrap; }
.tabs button {
  background: none; border: none; padding: 9px 16px; cursor: pointer;
  font-size: 14px; font-weight: 600; color: var(--muted); font-family: inherit;
  border-bottom: 3px solid transparent; margin-bottom: -2px;
}
.tabs button.active { color: var(--primary); border-bottom-color: var(--primary); }
.tabs button:hover { color: var(--primary-dark); }

/* ===== Bộ lọc ===== */
.filters { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 12px; }
.filters select, .filters input {
  padding: 6px 9px; border: 1px solid var(--border); border-radius: 6px;
  font-size: 13.5px; font-family: inherit; background: #fff;
}
.filters input[type=search] { min-width: 200px; }

.muted { color: var(--muted); }
.small { font-size: 12.5px; }
.mt0 { margin-top: 0; }
.empty-note { text-align: center; color: var(--muted); padding: 28px 10px; }