@import url('https://fonts.googleapis.com/css2?family=Baloo+2:wght@500;600;700;800&family=Quicksand:wght@400;500;600;700&display=swap');

:root {
  --radius: 20px;
  --radius-sm: 12px;
  --shadow: 0 8px 24px rgba(0,0,0,.12);
  --shadow-sm: 0 3px 10px rgba(0,0,0,.08);
  --font-head: 'Baloo 2', system-ui, sans-serif;
  --font-body: 'Quicksand', system-ui, sans-serif;
}

/* ---------- Theme: Du hành vũ trụ ---------- */
[data-theme="vu-tru"] {
  --bg: radial-gradient(circle at 20% 0%, #2a2467 0%, #14123a 45%, #0a0920 100%);
  --surface: #1e1b4b;
  --surface-2: #262260;
  --text: #f1efff;
  --text-dim: #b8b3e8;
  --primary: #8b7bff;
  --primary-2: #5ee7ff;
  --accent: #ffd166;
  --success: #4fd68c;
  --warn: #ff8a5c;
  --danger: #ff6b8b;
  --border: rgba(255,255,255,.12);
  --card-bg: rgba(255,255,255,.06);
}

/* ---------- Theme: Công viên giải trí ---------- */
[data-theme="cong-vien"] {
  --bg: linear-gradient(160deg, #fff6e0 0%, #ffe3ef 45%, #e0f7ff 100%);
  --surface: #ffffff;
  --surface-2: #fff9ef;
  --text: #33254b;
  --text-dim: #7a6d94;
  --primary: #ff6f91;
  --primary-2: #ffb238;
  --accent: #6c5ce7;
  --success: #2bb673;
  --warn: #ff9f43;
  --danger: #ff5e7a;
  --border: rgba(51,37,75,.12);
  --card-bg: #ffffff;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding-bottom: 88px;
}
h1, h2, h3, .headline { font-family: var(--font-head); font-weight: 700; }

.wrap { max-width: 640px; margin: 0 auto; padding: 20px 16px; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px; max-width: 640px; margin: 0 auto;
}
.topbar .brand { font-family: var(--font-head); font-size: 22px; font-weight: 800; display:flex; align-items:center; gap:8px; }
.topbar .child-chip {
  display: flex; align-items: center; gap: 6px; background: var(--card-bg);
  border: 1px solid var(--border); border-radius: 999px; padding: 6px 12px; font-weight: 600; font-size: 14px;
  text-decoration: none; color: var(--text);
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 18px;
  margin-bottom: 16px;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-head); font-weight: 700; font-size: 16px;
  border: none; border-radius: var(--radius-sm); padding: 14px 20px; cursor: pointer;
  background: var(--primary); color: white; box-shadow: var(--shadow-sm);
  transition: transform .12s ease;
  width: 100%;
}
.btn:active { transform: scale(.97); }
.btn.secondary { background: var(--surface-2); color: var(--text); }
.btn.ghost { background: transparent; color: var(--primary); box-shadow: none; border: 2px dashed var(--border); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-row { display: flex; gap: 10px; }
.btn-row .btn { width: auto; flex: 1; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

.child-pick {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  background: var(--card-bg); border: 2px solid var(--border); border-radius: var(--radius);
  padding: 22px 10px; cursor: pointer; text-decoration: none; color: var(--text);
  transition: transform .15s ease, border-color .15s ease;
}
.child-pick:active { transform: scale(.96); }
.child-pick .avatar { font-size: 52px; }
.child-pick .name { font-family: var(--font-head); font-weight: 700; font-size: 18px; }
.child-pick .grade { font-size: 13px; color: var(--text-dim); }

.subject-pick {
  display: flex; align-items: center; gap: 12px;
  background: var(--card-bg); border: 2px solid var(--border); border-radius: var(--radius-sm);
  padding: 16px; cursor: pointer; margin-bottom: 10px;
}
.subject-pick.active { border-color: var(--primary); background: color-mix(in srgb, var(--primary) 12%, var(--card-bg)); }
.subject-pick .icon { font-size: 28px; }
.subject-pick .name { font-family: var(--font-head); font-weight: 700; font-size: 16px; flex: 1; }

.badge {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--surface-2); border-radius: 999px; padding: 5px 12px; font-size: 13px; font-weight: 600;
}
.badge.score-high { background: color-mix(in srgb, var(--success) 20%, transparent); color: var(--success); }
.badge.score-mid { background: color-mix(in srgb, var(--warn) 20%, transparent); color: var(--warn); }
.badge.score-low { background: color-mix(in srgb, var(--danger) 20%, transparent); color: var(--danger); }

.score-huge { font-family: var(--font-head); font-size: 64px; font-weight: 800; line-height: 1; text-align: center; }
.score-huge small { font-size: 24px; opacity: .6; }

.upload-box {
  border: 3px dashed var(--border); border-radius: var(--radius); padding: 28px 16px;
  text-align: center; cursor: pointer; background: var(--card-bg);
}
.upload-box img { max-width: 100%; border-radius: var(--radius-sm); margin-top: 10px; }

textarea, input[type=text], input[type=number] {
  width: 100%; font-family: var(--font-body); font-size: 15px; padding: 12px 14px;
  border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--surface-2); color: var(--text);
}

.nav-bottom {
  position: fixed; bottom: 0; left: 0; right: 0; background: var(--surface);
  border-top: 1px solid var(--border); display: flex; justify-content: space-around;
  padding: 8px 4px calc(8px + env(safe-area-inset-bottom)); z-index: 20;
}
.nav-bottom a {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  color: var(--text-dim); text-decoration: none; font-size: 11px; font-weight: 600; padding: 4px 8px; border-radius: 10px;
}
.nav-bottom a.active { color: var(--primary); }
.nav-bottom a .ic { font-size: 20px; }

.loader {
  display: flex; flex-direction: column; align-items: center; gap: 14px; padding: 40px 10px; text-align: center;
}
.loader .spin { font-size: 48px; animation: spin 1.6s linear infinite; }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes pop { 0% { transform: scale(.7); opacity:0; } 100% { transform: scale(1); opacity:1; } }
.pop-in { animation: pop .35s ease; }

.pin-pad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; max-width: 280px; margin: 0 auto; }
.pin-pad button {
  font-family: var(--font-head); font-size: 22px; font-weight: 700; padding: 16px 0;
  border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--card-bg); color: var(--text); cursor: pointer;
}
.pin-dots { display: flex; justify-content: center; gap: 10px; margin: 18px 0; }
.pin-dots span { width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--primary); }
.pin-dots span.filled { background: var(--primary); }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); }
th { color: var(--text-dim); font-weight: 600; font-size: 12px; text-transform: uppercase; }

.empty-state { text-align: center; padding: 40px 20px; color: var(--text-dim); }
.empty-state .big { font-size: 44px; margin-bottom: 8px; }

.chip-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.chip {
  border: 1px solid var(--border); background: var(--card-bg); border-radius: 999px;
  padding: 7px 14px; font-size: 13px; font-weight: 600; cursor: pointer; color: var(--text);
}
.chip.active { background: var(--primary); color: white; border-color: var(--primary); }

a { color: var(--primary); }
.muted { color: var(--text-dim); font-size: 13px; }
.center { text-align: center; }
.mt8{margin-top:8px}.mt16{margin-top:16px}.mb0{margin-bottom:0}