/* Giao diện riêng cho các con (body.teen): đêm sâu, màu nhấn tươi, ít chữ, nhiều chuyển động nhẹ.
   Màu nhấn đổi theo lựa chọn của con qua biến --nhan. */
body.teen {
  --bg: #0E1712;
  --bg2: #15221B;
  --card: #18271F;
  --line2: rgba(255, 255, 255, .08);
  --txt: #EEF5EF;
  --mut: #9DB3A5;
  --nhan: #5BE3A0;
  --nhan-chu: #0E1712;
  --amber2: #FFB547;
  background: radial-gradient(120% 60% at 50% -10%, color-mix(in srgb, var(--nhan) 22%, transparent), transparent 60%), var(--bg);
  background-attachment: fixed;
  color: var(--txt);
}
body.teen .top { background: transparent; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--line2); }
body.teen .ghost { border-color: var(--line2); color: var(--mut); }
body.teen h1, body.teen h2, body.teen h3 { color: var(--txt); }
body.teen .sub, body.teen .small { color: var(--mut); }
body.teen .card { background: var(--card); border: 1px solid var(--line2); box-shadow: 0 18px 40px -24px rgba(0, 0, 0, .8); }
body.teen .card.done { background: color-mix(in srgb, var(--nhan) 12%, var(--card)); border-color: color-mix(in srgb, var(--nhan) 35%, transparent); }
body.teen .card.hero { background: linear-gradient(135deg, color-mix(in srgb, var(--nhan) 30%, var(--card)), var(--card) 70%); }
body.teen .eyebrow { color: var(--nhan); }
body.teen .btn { background: var(--nhan); color: var(--nhan-chu); }
body.teen .btn.amber { background: var(--amber2); color: #1A1206; }
body.teen .btn.line { background: transparent; color: var(--nhan); border-color: color-mix(in srgb, var(--nhan) 60%, transparent); }
body.teen .leaf { background: color-mix(in srgb, var(--nhan) 16%, transparent); color: var(--txt); }
body.teen .so { background: var(--nhan); color: var(--nhan-chu); }
body.teen .so.khoa { background: var(--bg2); color: var(--mut); }
body.teen .tick { border-color: var(--line2); }
body.teen .tick .ok { color: var(--nhan); }
body.teen .tool { background: var(--card); border-color: var(--line2); color: var(--txt); box-shadow: none; }
body.teen .tool:active { transform: scale(.97); }
body.teen .nho { background: var(--amber2); color: #1A1206; }
body.teen .ngay { border-color: var(--line2); }
body.teen input.f, body.teen textarea.f, body.teen select.f { background: var(--bg2); border-color: var(--line2); color: var(--txt); }
body.teen input.f:focus, body.teen textarea.f:focus { border-color: var(--nhan); }
body.teen .wx, body.teen .chip { background: var(--bg2); border-color: var(--line2); color: var(--txt); }
body.teen .wx.on { background: color-mix(in srgb, var(--nhan) 22%, var(--bg2)); border-color: var(--nhan); transform: translateY(-2px); }
body.teen .chip.on { background: var(--nhan); border-color: var(--nhan); color: var(--nhan-chu); }
body.teen .tabs { background: rgba(14, 23, 18, .92); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-top-color: var(--line2); }
body.teen .tabs button { color: var(--mut); }
body.teen .tabs button.on { color: var(--nhan); }
body.teen .tabs button.help { color: #FF8A7A; }
body.teen .modal { background: rgba(0, 0, 0, .6); }
body.teen .sheet { background: var(--bg2); color: var(--txt); }
body.teen .x { background: var(--card); color: var(--txt); }
body.teen .msg.ok { color: var(--nhan); }
body.teen .msg.err { color: #FF8A7A; }
body.teen .alert { background: rgba(255, 122, 107, .12); border-color: rgba(255, 122, 107, .4); }
body.teen .loading { color: var(--mut); }

/* Màn Nhà */
.chao { display: flex; align-items: center; gap: 14px; margin: 4px 0 16px; }
.ava {
  position: relative; width: 76px; height: 76px; border-radius: 50%; display: grid; place-items: center; font-size: 34px;
  background: transparent; border: none; cursor: pointer; flex: none; padding: 0;
}
.ava span { width: 58px; height: 58px; border-radius: 50%; display: grid; place-items: center; background: color-mix(in srgb, var(--nhan) 18%, var(--card)); }
.ava .vong { position: absolute; inset: 0; width: 76px; height: 76px; }
.chao h1 { margin: 0; font-size: 28px; }
.chao .sub { margin: 2px 0 0; }
.thanh { height: 8px; border-radius: 99px; background: var(--bg2); overflow: hidden; margin-top: 8px; }
.thanh i { display: block; height: 100%; background: linear-gradient(90deg, var(--nhan), var(--amber2)); border-radius: 99px; }
.cayhero { text-align: center; padding: 14px 14px 16px; }
.cayhero .so-la { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin-top: 2px; }
.cayhero .so-la span { background: var(--bg2); border: 1px solid var(--line2); border-radius: 99px; padding: 5px 12px; font-size: 14px; font-weight: 600; }
.homnay { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 14px; }
.o {
  position: relative; background: var(--card); border: 1px solid var(--line2); border-radius: 20px;
  padding: 14px 8px 12px; text-align: center; cursor: pointer; color: var(--txt); font: inherit;
  transition: transform .15s ease, border-color .15s ease;
}
.o:active { transform: scale(.95); }
.o b { display: block; font-size: 30px; line-height: 1.1; margin-bottom: 6px; }
.o span { display: block; font-size: 13px; font-weight: 700; }
.o small { display: block; font-size: 12px; color: var(--mut); margin-top: 2px; }
.o.xong { border-color: var(--nhan); background: color-mix(in srgb, var(--nhan) 14%, var(--card)); }
.o.xong::after {
  content: "✓"; position: absolute; top: 7px; right: 9px; width: 20px; height: 20px; border-radius: 50%;
  background: var(--nhan); color: var(--nhan-chu); font-size: 12px; font-weight: 800; display: grid; place-items: center;
}
.chuoi { display: inline-flex; align-items: center; gap: 6px; background: var(--bg2); border: 1px solid var(--line2); border-radius: 99px; padding: 6px 12px; font-weight: 700; font-size: 14px; }
.nhom-wx { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.nhom-wx span { background: var(--bg2); border-radius: 14px; padding: 8px 12px; font-size: 15px; }

/* Lá bay khi làm xong */
.toast {
  position: fixed; left: 50%; bottom: 110px; transform: translateX(-50%); z-index: 80;
  background: var(--nhan, #2E7D4F); color: var(--nhan-chu, #fff); font-weight: 800; padding: 12px 18px; border-radius: 99px;
  box-shadow: 0 12px 30px -10px rgba(0, 0, 0, .6); animation: toast 2.2s ease forwards; pointer-events: none;
}
@keyframes toast { 0% { opacity: 0; transform: translate(-50%, 16px); } 12% { opacity: 1; transform: translate(-50%, 0); } 80% { opacity: 1; } 100% { opacity: 0; transform: translate(-50%, -8px); } }
.la-bay { position: fixed; z-index: 79; font-size: 24px; pointer-events: none; animation: bay 1.6s ease-out forwards; }
@keyframes bay { 0% { opacity: 1; transform: translate(0, 0) rotate(0); } 100% { opacity: 0; transform: translate(var(--dx), -260px) rotate(var(--rot)); } }

/* Chọn hình đại diện và màu */
.avas { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.avas button { font-size: 28px; padding: 8px 0; border-radius: 14px; background: var(--card); border: 2px solid transparent; cursor: pointer; }
.avas button.on { border-color: var(--nhan); }
.maus { display: flex; gap: 12px; margin: 10px 0; }
.maus button { width: 44px; height: 44px; border-radius: 50%; border: 3px solid transparent; cursor: pointer; }
.maus button.on { border-color: #fff; }

@media (prefers-reduced-motion: reduce) {
  .toast, .la-bay { animation: none; }
  .la-bay { display: none; }
}

/* Ô đúng giờ trong ngày nổi lên nhẹ */
.o.now { border-color: color-mix(in srgb, var(--nhan) 70%, transparent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--nhan) 14%, transparent), 0 10px 26px -12px var(--nhan); }
/* Bầu trời của nhóm */
.bautroi { position: relative; height: 120px; border-radius: 18px; overflow: hidden;
  background: radial-gradient(80% 90% at 50% 100%, #1D2B3A, #0B1220); }
.bautroi i { position: absolute; width: 12px; height: 12px; border-radius: 50%; background: var(--m);
  box-shadow: 0 0 14px 4px color-mix(in srgb, var(--m) 55%, transparent); animation: troi 6s ease-in-out infinite; }
@keyframes troi { 0%, 100% { transform: translateY(0); opacity: .85; } 50% { transform: translateY(-8px); opacity: 1; } }
/* Lời nhắc dừng */
.du { text-align: center; color: var(--mut); margin: 18px 12px 6px; font-size: 15px; }
/* Cây rung rinh khi chạm */
.cayhero { cursor: pointer; }
.cayhero svg.rung { animation: rung .9s ease; transform-origin: 50% 80%; }
@keyframes rung { 0% { transform: rotate(0); } 25% { transform: rotate(-2.5deg); } 55% { transform: rotate(2deg); } 80% { transform: rotate(-1deg); } 100% { transform: rotate(0); } }
@media (prefers-reduced-motion: reduce) { .bautroi i, .cayhero svg.rung { animation: none; } }
/* Cây phát sáng nhẹ theo màu của con (ý từ bản phác của Gemini) */
.cayhero svg { filter: drop-shadow(0 0 18px color-mix(in srgb, var(--nhan) 45%, transparent)); }