/* ===== VA Camera - giao dien chung ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
/* Bat buoc: phan tu co thuoc tinh hidden phai LUON an (thang moi display:flex khac) */
[hidden] { display: none !important; }
:root {
  --primary: #0b6e4f;
  --primary-dark: #095a41;
  --bg: #f4f6f5;
  --card: #ffffff;
  --text: #1d2b26;
  --muted: #6b7a74;
  --border: #dde5e1;
  --danger: #c0392b;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg); color: var(--text); min-height: 100vh;
}
h1 { font-size: 1.35rem; }
h2 { font-size: 1.1rem; margin-bottom: .5rem; }
.muted { color: var(--muted); }
.small { font-size: .82rem; }
.center { text-align: center; }
.error {
  background: #fdecea; color: var(--danger); border: 1px solid #f5c6c0;
  padding: .55rem .8rem; border-radius: 8px; margin-bottom: .75rem; font-size: .9rem;
}

/* ===== Layout ===== */
.center-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.container { max-width: 760px; margin: 0 auto; padding: 1rem; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.25rem; box-shadow: 0 1px 3px rgba(0,0,0,.05);
}
.login-card { width: 100%; max-width: 380px; text-align: center; }
.login-card .logo { font-size: 2.5rem; }
.login-card h1 { margin: .25rem 0; color: var(--primary); }
.login-card form { margin-top: 1rem; text-align: left; }

/* ===== Form ===== */
label { display: block; font-size: .88rem; font-weight: 600; margin-bottom: .8rem; }
input, select {
  display: block; width: 100%; margin-top: .3rem;
  padding: .6rem .75rem; font-size: 1rem;
  border: 1px solid var(--border); border-radius: 8px; background: #fff;
}
input:focus, select:focus { outline: 2px solid var(--primary); border-color: transparent; }

/* ===== Nut ===== */
.btn {
  display: inline-block; border: none; cursor: pointer; font-size: .95rem;
  padding: .6rem 1rem; border-radius: 8px; background: #e8eeeb; color: var(--text);
}
.btn:active { transform: scale(.98); }
.btn-primary { background: var(--primary); color: #fff; font-weight: 600; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-block { width: 100%; }
.btn-ghost { background: transparent; color: var(--muted); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: .35rem .6rem; font-size: .82rem; }

/* ===== Topbar ===== */
.topbar {
  background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: space-between;
  padding: .7rem 1rem; position: sticky; top: 0; z-index: 10;
}
.topbar-title { font-weight: 700; font-size: 1.05rem; }
.topbar-right { display: flex; align-items: center; gap: .5rem; }
.topbar .muted { color: #d4e6de; font-size: .85rem; }
.topbar .btn-ghost { color: #fff; }

/* ===== The con / camera ===== */
.child-card { margin-bottom: 1rem; }
.child-head { display: flex; align-items: baseline; gap: .5rem; flex-wrap: wrap; margin-bottom: .6rem; }
.child-name { font-weight: 700; font-size: 1.05rem; }
.badge {
  background: #e2f0ea; color: var(--primary); font-size: .78rem;
  border-radius: 999px; padding: .15rem .6rem; font-weight: 600;
}
.cam-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: .6rem; }
.cam-btn {
  display: flex; align-items: center; gap: .55rem;
  border: 1px solid var(--border); border-radius: 10px;
  background: #fff; padding: .7rem .8rem; cursor: pointer; text-align: left; font-size: .92rem;
}
.cam-btn:hover { border-color: var(--primary); }
.cam-btn .ico { font-size: 1.3rem; }
.cam-btn.off { opacity: .55; }
.cam-btn .sub { display: block; font-size: .76rem; color: var(--muted); }

footer { padding: 1.2rem; }

/* ===== Man hinh xem camera (kieu app camera, nen toi) ===== */
#player-overlay {
  position: fixed; inset: 0; background: #000; z-index: 100;
  display: flex; align-items: center; justify-content: center;
}
.viewer {
  width: 100%; height: 100%; max-width: 1100px;
  display: flex; flex-direction: column; background: #000; position: relative;
}
.viewer-head, .viewer-foot {
  display: flex; align-items: center; justify-content: space-between;
  padding: .55rem .8rem; color: #eee; font-size: .92rem; background: #141414;
}
.viewer-head { font-weight: 600; }
.viewer-head-right { display: flex; align-items: center; gap: .35rem; }
.icon-btn {
  border: none; background: #2a2a2a; color: #fff; cursor: pointer;
  width: 38px; height: 38px; border-radius: 8px; font-size: 1.05rem;
}
.icon-btn:active { background: #3a3a3a; }
.viewer-foot { font-size: .82rem; color: #9aa; }
.viewer-hint { color: #667; }

/* Luoi camera: 1 cam = full, 2-4 cam = luoi 2 cot */
.viewer-grid {
  flex: 1; display: grid; gap: 3px; align-content: center;
  grid-template-columns: 1fr; background: #000; overflow: hidden;
}
.viewer-grid[data-n="2"], .viewer-grid[data-n="3"], .viewer-grid[data-n="4"] {
  grid-template-columns: 1fr 1fr;
}
.tile { position: relative; background: #0a0a0a; min-height: 0; cursor: pointer; }
.tile video { width: 100%; height: 100%; max-height: 78vh; object-fit: contain; display: block; background: #000; }
.tile-name {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: .8rem .6rem .35rem; font-size: .8rem; color: #fff; pointer-events: none;
  background: linear-gradient(transparent, rgba(0,0,0,.75));
}
.tile-msg {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  color: #8aa; font-size: .85rem; text-align: center; padding: .5rem; pointer-events: none;
}
/* Che do phong to 1 o trong luoi */
.viewer-grid.focus-mode { grid-template-columns: 1fr !important; }
.viewer-grid.focus-mode .tile:not(.focused) { display: none; }

.countdown { font-variant-numeric: tabular-nums; color: #ffd166; font-weight: 700; }
.player-resume {
  position: absolute; inset: 0; background: rgba(0,0,0,.85); z-index: 5;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: .8rem; color: #fff; text-align: center; padding: 1rem;
}

/* Nut xem tat ca camera cua lop */
.btn-viewall { margin-top: .6rem; }

/* ===== Khung "Xem thu" don gian cho trang ADMIN ===== */
.player-box {
  width: 100%; max-width: 900px; margin: auto;
  background: #111; border-radius: 12px; overflow: hidden; position: relative;
}
.player-head, .player-foot {
  display: flex; align-items: center; justify-content: space-between;
  padding: .55rem .8rem; color: #eee; font-size: .92rem; background: #1b1b1b;
}
.player-head { font-weight: 600; }
#player-video { width: 100%; aspect-ratio: 16/9; background: #000; display: block; }