/* Quản lý CLB Vovinam — gói giao diện PRO: xanh Vovinam + tre thật */
:root {
  --bg: #eef4fb; --card: #fff; --ink: #16263d; --muted: #5d6b82;
  --line: #dde6f1; --pri: #1565c0; --pri-mid: #2f7fd0; --pri-d: #0d47a1;
  --pri-soft: #e3eefb; --pri-soft2: #cfe2f7;
  --ok: #1a7f4b; --warn: #b7791f; --bad: #c0392b; --info: #1565c0;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(13, 71, 161, .07);
  --shadow-lg: 0 10px 30px rgba(13, 71, 161, .14);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
body { margin: 0; font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg);
  /* Nền tre thật, phủ trắng vừa phải để vừa rõ vừa đọc chữ tốt */
  background-image: linear-gradient(rgba(255,255,255,.75), rgba(255,255,255,.75)), url(../img/bamboo-hero.jpg);
  background-repeat: no-repeat; background-position: center; background-attachment: fixed;
  background-size: cover;
  color: var(--ink); font-size: 15px; line-height: 1.5; }
.hidden { display: none !important; }
h1 { font-size: 1.35rem; margin: 0 0 .6rem; }
h2 { font-size: 1.1rem; margin: 1rem 0 .5rem; }
h3 { font-size: 1rem; margin: .8rem 0 .4rem; }
a { color: var(--pri); }

/* Topbar — gradient xanh Vovinam */
#topbar { position: sticky; top: 0; z-index: 50; display: flex; align-items: center; gap: .5rem;
  background: linear-gradient(90deg, var(--pri-d), var(--pri) 55%, var(--pri-mid));
  color: #fff; padding: .6rem .7rem; box-shadow: 0 2px 12px rgba(13, 71, 161, .25); }
#topbar .brand { font-weight: 700; flex: 1; white-space: nowrap; overflow: hidden; letter-spacing: .2px;
  display: flex; align-items: center; gap: .5rem; }
.brand-logo { width: 30px; height: 30px; border-radius: 8px; object-fit: cover;
  box-shadow: 0 1px 4px rgba(0,0,0,.3); flex-shrink: 0; }
#topbar button { background: rgba(255,255,255,.16); border: 0; color: #fff; border-radius: 8px;
  padding: .45rem .6rem; font-size: 1rem; cursor: pointer; transition: background .15s; }
#topbar button:hover { background: rgba(255,255,255,.28); }
#branchSel { max-width: 42vw; padding: .4rem; border-radius: 8px; border: 0; font-size: .85rem;
  background: rgba(255,255,255,.95); }

/* Sidenav — xanh navy đậm */
#sidenav { position: fixed; top: 0; left: 0; bottom: 0; width: 240px; background: #0e2a4a; color: #dbe7f5;
  z-index: 60; padding: 1rem .6rem; transform: translateX(-105%); transition: transform .2s; overflow-y: auto; }
#sidenav.open { transform: none; }
#sidenav a { display: block; color: #dbe7f5; text-decoration: none; padding: .6rem .7rem; border-radius: 10px; margin-bottom: 2px; transition: background .15s; }
#sidenav a.active, #sidenav a:hover { background: linear-gradient(90deg, var(--pri), var(--pri-mid)); color: #fff; }
#sidenav .nav-user { padding: .4rem .7rem 1rem; font-size: .85rem; color: #9db4d0; border-bottom: 1px solid rgba(255,255,255,.12); margin-bottom: .8rem; }
#navOverlay { position: fixed; inset: 0; background: rgba(10,25,45,.45); z-index: 55; }

/* Main */
#view { padding: .9rem; max-width: 1100px; margin: 0 auto; padding-bottom: 4rem; }
/* Gạch nhấn xanh dưới tiêu đề trang */
#view > .row.spread > h1 { position: relative; padding-bottom: .35rem; }
#view > .row.spread > h1::after { content: ""; position: absolute; left: 0; bottom: 0; width: 46px; height: 3px;
  border-radius: 2px; background: linear-gradient(90deg, var(--pri), var(--pri-mid)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: .95rem; margin-bottom: .8rem; box-shadow: var(--shadow); }
.row { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }
.spread { justify-content: space-between; }
.muted { color: var(--muted); font-size: .87rem; }
.grid { display: grid; gap: .7rem; }
.grid.kpi { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
.kpi .card { text-align: center; margin: 0; border-top: 3px solid var(--pri-soft2); transition: transform .15s, box-shadow .15s; }
.kpi .card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.kpi .num { font-size: 1.8rem; font-weight: 800;
  background: linear-gradient(180deg, var(--pri-mid), var(--pri-d));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.kpi .lbl { font-size: .82rem; color: var(--muted); }

/* Table */
.tbl-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { padding: .55rem .4rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: .8rem; text-transform: uppercase; }
tr.clickable { cursor: pointer; }
tr.clickable:hover td { background: var(--pri-soft); }

/* Badges */
.badge { display: inline-block; padding: .15rem .55rem; border-radius: 999px; font-size: .78rem; font-weight: 600; white-space: nowrap; }
.b-paid, .b-active { background: #e3f5ea; color: var(--ok); }
.b-due_soon { background: #fdf3dd; color: var(--warn); }
.b-overdue, .b-unpaid { background: #fbe4e1; color: var(--bad); }
.b-paused { background: #e8eefc; color: var(--info); }
.b-stopped, .b-inactive { background: #eceff4; color: var(--muted); }
.b-present { background: #e3f5ea; color: var(--ok); }
.b-absent { background: #fbe4e1; color: var(--bad); }
.b-excused { background: #fdf3dd; color: var(--warn); }

/* Forms */
label { display: block; font-size: .85rem; color: var(--muted); margin: .5rem 0 .2rem; }
input, select, textarea { width: 100%; padding: .55rem .6rem; border: 1px solid var(--line);
  border-radius: 9px; font-size: 1rem; background: #fff; color: var(--ink); transition: border-color .15s, box-shadow .15s; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--pri); box-shadow: 0 0 0 3px rgba(21,101,192,.15); }
textarea { min-height: 90px; resize: vertical; }
.btn { display: inline-block; border: 0; border-radius: 10px; padding: .6rem 1rem; font-size: .95rem;
  font-weight: 600; cursor: pointer; background: linear-gradient(180deg, var(--pri-mid), var(--pri));
  color: #fff; box-shadow: 0 2px 8px rgba(21,101,192,.3); transition: filter .15s, transform .1s; }
.btn:hover { filter: brightness(1.08); }
.btn:active { transform: translateY(1px); }
.btn.ghost { background: #eef2f8; color: var(--ink); box-shadow: none; }
.btn.small { padding: .35rem .6rem; font-size: .85rem; }
.btn.danger { background: linear-gradient(180deg, #d95448, var(--bad)); box-shadow: 0 2px 8px rgba(192,57,43,.3); }
.btn.ok { background: linear-gradient(180deg, #22985c, var(--ok)); box-shadow: 0 2px 8px rgba(26,127,75,.3); }
.btnrow { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .7rem; }

/* Tabs */
.tabs { display: flex; gap: .3rem; overflow-x: auto; margin-bottom: .8rem; border-bottom: 2px solid var(--line); }
.tabs button { border: 0; background: none; padding: .55rem .8rem; font-size: .95rem; cursor: pointer;
  color: var(--muted); border-bottom: 3px solid transparent; margin-bottom: -2px; white-space: nowrap; }
.tabs button.active { color: var(--pri); border-color: var(--pri); font-weight: 700; }

/* ===== Màn hình đăng nhập — landing hero tre ===== */
.login-wrap { position: fixed; inset: 0; z-index: 40; display: flex; align-items: center; justify-content: center;
  padding: 1.5rem 1rem; overflow-y: auto;
  background-image: linear-gradient(115deg, rgba(10,35,70,.9) 0%, rgba(10,35,70,.55) 48%, rgba(21,101,192,.28) 100%), url(../img/bamboo-hero.jpg);
  background-size: cover; background-position: center; }
.login-box { width: 100%; max-width: 380px; background: rgba(255,255,255,.94);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.6); border-radius: 20px; padding: 1.8rem 1.5rem;
  box-shadow: 0 20px 60px rgba(0,0,0,.35); }
.login-box h1 { text-align: center; color: var(--pri-d); margin-bottom: .2rem; }
.login-box h1::after { content: "Học viên • Điểm danh • Thu phí"; display: block; font-size: .82rem;
  font-weight: 400; color: var(--muted); margin-top: .35rem; }
.login-logo { text-align: center; margin-bottom: .4rem; }
.login-logo img { width: 110px; height: 110px; border-radius: 26px; object-fit: cover;
  box-shadow: 0 8px 24px rgba(13,71,161,.35); border: 3px solid rgba(255,255,255,.85); }

/* Toast + modal */
#toast { position: fixed; left: 50%; bottom: 1.2rem; transform: translateX(-50%); background: #0e2a4a;
  color: #fff; padding: .7rem 1.1rem; border-radius: 10px; z-index: 100; font-size: .92rem;
  max-width: 92vw; box-shadow: 0 4px 16px rgba(0,0,0,.25); }
#modal { position: fixed; inset: 0; background: rgba(10,25,45,.5); z-index: 90; display: flex;
  align-items: flex-start; justify-content: center; padding: 4vh 1rem; overflow-y: auto; }
.modal-box { background: #fff; border-radius: 16px; width: 100%; max-width: 560px; padding: 1.1rem; box-shadow: var(--shadow-lg); }

/* Attendance grid */
.att-row { display: flex; align-items: center; gap: .5rem; padding: .5rem 0; border-bottom: 1px solid var(--line); }
.att-row .nm { flex: 1; }
.seg { display: flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.seg button { border: 0; background: #fff; padding: .4rem .55rem; font-size: .85rem; cursor: pointer; }
.seg button.on-p { background: var(--ok); color: #fff; }
.seg button.on-a { background: var(--bad); color: #fff; }
.seg button.on-e { background: var(--warn); color: #fff; }

.progress { height: 8px; background: #eef1f7; border-radius: 99px; overflow: hidden; }
.progress > div { height: 100%; background: var(--ok); }
.low > div { background: var(--bad); }

@media (min-width: 760px) {
  #view { padding: 1.4rem; }
  #sidenav { transform: none; position: sticky; top: 52px; height: calc(100vh - 52px); float: left; }
  #menuBtn, #navOverlay { display: none; }
  #app { display: block; }
  main#view { margin-left: 240px; }
}