:root {
  --bg: #fff8ef;
  --card: #ffffff;
  --ink: #1e293b;
  --muted: #64748b;
  --line: #e7e1d8;
  --primary: #2563eb;
  --ok: #16a34a;
  --bad: #dc2626;
  --radius: 20px;
  --shadow: 0 4px 0 rgba(30, 41, 59, .08), 0 10px 24px rgba(30, 41, 59, .06);
  --font-head: 'Baloo 2', 'Nunito', system-ui, sans-serif;
  --font: 'Nunito', system-ui, -apple-system, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--font); font-size: 18px; line-height: 1.55;
  background-image: radial-gradient(#f3e6d3 1.2px, transparent 1.2px);
  background-size: 22px 22px;
}
a { color: var(--primary); }
h1, h2, h3 { font-family: var(--font-head); line-height: 1.2; margin: 0 0 .4em; }
button { font: inherit; }

/* ---------- khung ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 20px; background: rgba(255, 255, 255, .92); backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--line);
}
.logo { font-family: var(--font-head); font-weight: 800; font-size: 24px; color: var(--ink); text-decoration: none; white-space: nowrap; }
.logo span { color: #f97316; }
.topbar nav { display: flex; gap: 4px; flex-wrap: wrap; }
.topbar nav a { text-decoration: none; color: var(--ink); font-weight: 700; padding: 6px 12px; border-radius: 999px; font-size: 16px; }
.topbar nav a:hover { background: #fef3c7; }
main { max-width: 1040px; margin: 0 auto; padding: 20px 16px 40px; }
.foot { text-align: center; color: var(--muted); font-size: 14px; padding: 20px 16px 30px; }
body[data-view="exam"] .topbar nav, body[data-view="speed"] .topbar nav { display: none; }

.back { display: inline-block; margin-bottom: 12px; font-weight: 700; text-decoration: none; }
.page-title { font-size: 36px; }
.lead { color: var(--muted); max-width: 720px; }
.muted { color: var(--muted); }
.sec-title { font-size: 26px; margin: 30px 0 14px; }

/* ---------- hero ---------- */
.hero {
  background: linear-gradient(135deg, #fde68a, #fdba74 55%, #f9a8d4);
  border-radius: 28px; padding: 30px; box-shadow: var(--shadow);
}
.hero h1 { font-size: clamp(30px, 5vw, 46px); }
.hero h1 span { color: #7c2d12; }
.hero p { max-width: 640px; margin: 0 0 18px; }
.hero-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 12px; }
.hero-stats > div { background: rgba(255, 255, 255, .8); border-radius: 16px; padding: 10px 14px; display: flex; flex-direction: column; }
.hero-stats.wide > div { background: var(--card); box-shadow: var(--shadow); }
.hero-stats b { font-family: var(--font-head); font-size: 30px; line-height: 1.1; }
.hero-stats span { font-size: 14px; color: #57534e; }

.daily {
  display: flex; align-items: center; gap: 16px; margin-top: 18px; padding: 16px 20px;
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  border: 3px dashed #f59e0b; text-decoration: none; color: var(--ink);
  transition: transform .15s;
}
.daily:hover { transform: translateY(-2px); }
.daily h3 { margin: 0; font-size: 22px; }
.daily p { margin: 0; color: var(--muted); font-size: 16px; }
.daily-ico { font-size: 44px; }
.daily .go { margin-left: auto; font-weight: 800; color: #b45309; white-space: nowrap; }
.daily.done { border-color: var(--ok); }

/* ---------- lưới thẻ ---------- */
.grid { display: grid; gap: 16px; }
.grid.topics { grid-template-columns: repeat(auto-fill, minmax(185px, 1fr)); }
.grid.modes { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.grid.levels { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid.mini { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px; margin: 14px 0; }
.card {
  --c: var(--primary);
  display: block; background: var(--card); border-radius: var(--radius); padding: 18px;
  box-shadow: var(--shadow); color: var(--ink); text-decoration: none;
  border-top: 6px solid var(--c); transition: transform .15s, box-shadow .15s;
}
a.card:hover { transform: translateY(-4px); box-shadow: 0 8px 0 rgba(30, 41, 59, .08), 0 16px 30px rgba(30, 41, 59, .1); }
.card.flat { border-top: none; border-left: 6px solid var(--c); padding: 12px 16px; }
.card h3 { font-size: 22px; margin: 6px 0 4px; }
.card p { margin: 0 0 8px; color: var(--muted); font-size: 15px; }
.card small { color: var(--muted); font-weight: 700; }
.ico { font-size: 38px; width: 60px; height: 60px; display: grid; place-items: center; border-radius: 18px; background: color-mix(in srgb, var(--c, #f59e0b) 15%, white); }
.ico.big { font-size: 54px; width: 90px; height: 90px; border-radius: 26px; margin: 0 auto 10px; }
.meter { height: 12px; background: #f1f5f9; border-radius: 999px; overflow: hidden; }
.meter > div { height: 100%; background: var(--c); border-radius: 999px; transition: width .4s; }

.stars { color: #f59e0b; font-size: 24px; letter-spacing: 2px; }
.stars .off { color: #e2e8f0; }
.big-stars .stars { font-size: 60px; }

/* ---------- chủ đề ---------- */
.topic-head { display: flex; gap: 18px; align-items: center; background: var(--card); padding: 20px; border-radius: 24px; box-shadow: var(--shadow); border-left: 10px solid var(--c); }
.topic-head .ico.big { margin: 0; flex: none; }
.topic-head h1 { font-size: 36px; margin: 0; }
.topic-head p { margin: 0; color: var(--muted); }
.level h3 { color: var(--c); }
.theory { background: var(--card); border-radius: 24px; padding: 24px; margin-top: 26px; box-shadow: var(--shadow); }
.theory h2 { font-size: 24px; color: var(--c); margin-top: 18px; }
.theory h2:first-child { margin-top: 0; }
.theory li { margin-bottom: 6px; }
.example { border: 2px solid var(--line); border-radius: 14px; padding: 10px 14px; margin-bottom: 10px; }
.example summary { cursor: pointer; }
.example[open] summary { margin-bottom: 8px; }

/* ---------- câu hỏi ---------- */
.sess-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.sess-head .back { margin: 0; }
.sess-title { font-family: var(--font-head); font-weight: 700; font-size: 22px; flex: 1; }
.sess-score { font-weight: 800; background: #dcfce7; color: #166534; padding: 4px 14px; border-radius: 999px; }
.progress { height: 14px; background: #fff; border-radius: 999px; overflow: hidden; margin: 12px 0 18px; box-shadow: inset 0 0 0 2px var(--line); }
.progress > div { height: 100%; background: linear-gradient(90deg, #f59e0b, #f97316); transition: width .4s; }

.qcard { background: var(--card); border-radius: 26px; padding: 22px 24px; box-shadow: var(--shadow); border-top: 8px solid var(--c); }
.q-top { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.q-label { font-family: var(--font-head); font-weight: 800; font-size: 22px; color: var(--c); }
.tag { font-size: 14px; font-weight: 700; background: color-mix(in srgb, var(--c) 12%, white); color: color-mix(in srgb, var(--c) 75%, black); padding: 3px 12px; border-radius: 999px; }
.icon-btn { margin-left: auto; border: 2px solid var(--line); background: #fff; border-radius: 999px; width: 44px; height: 44px; cursor: pointer; font-size: 20px; }
.icon-btn:hover { background: #f8fafc; }
.q-text { font-size: 22px; font-weight: 600; }
.seq { font-family: var(--font-head); font-size: 32px; font-weight: 700; margin: 10px 0; letter-spacing: .5px; line-height: 1.4; }
.seq.emoji { font-size: 30px; letter-spacing: 2px; }
.box { display: inline-block; min-width: 1.1em; text-align: center; color: #dc2626; }
.q-visual { margin: 14px 0; display: flex; justify-content: center; }
.fig { width: 100%; height: auto; }

.answer-area { display: flex; gap: 20px; align-items: flex-start; flex-wrap: wrap; margin-top: 18px; }
.ans-wrap { font-weight: 800; font-size: 22px; display: flex; align-items: center; gap: 10px; }
.ans {
  width: 150px; font: 800 32px var(--font-head); text-align: center; padding: 6px 10px;
  border: 3px solid #cbd5e1; border-radius: 16px; outline: none; color: var(--ink); background: #fff;
}
.ans:focus { border-color: var(--c, var(--primary)); box-shadow: 0 0 0 4px color-mix(in srgb, var(--c, #2563eb) 20%, transparent); }
.ans:disabled { background: #f8fafc; }
.keypad { display: grid; grid-template-columns: repeat(3, 56px); gap: 8px; }
.kp {
  height: 50px; border: none; border-radius: 14px; background: #f1f5f9; font: 800 22px var(--font-head);
  cursor: pointer; box-shadow: 0 3px 0 #cbd5e1; color: var(--ink);
}
.kp:active { transform: translateY(2px); box-shadow: 0 1px 0 #cbd5e1; }
.choices { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-top: 18px; }
.choice {
  padding: 14px; font: 700 26px var(--font-head); background: #fff; border: 3px solid #e2e8f0;
  border-radius: 18px; cursor: pointer; box-shadow: 0 4px 0 #e2e8f0; color: var(--ink);
}
.choice:hover:not(:disabled) { border-color: var(--c); }
.choice.sel { border-color: var(--c); background: color-mix(in srgb, var(--c) 12%, white); box-shadow: 0 4px 0 var(--c); }
.choice.right { border-color: var(--ok); background: #dcfce7; box-shadow: 0 4px 0 var(--ok); }
.choice.wrong { border-color: var(--bad); background: #fee2e2; box-shadow: 0 4px 0 var(--bad); }
.choice:disabled { cursor: default; }

.fb { margin-top: 18px; padding: 14px 18px; border-radius: 16px; font-weight: 800; font-size: 22px; animation: pop .3s; }
.fb.ok { background: #dcfce7; color: #166534; }
.fb.bad { background: #fee2e2; color: #991b1b; }
.solution { margin-top: 10px; background: #fffbeb; border: 2px dashed #fcd34d; padding: 12px 16px; border-radius: 14px; }

.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 18px; }
.actions.center { justify-content: center; }
.actions.spread { justify-content: space-between; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 12px 22px; border-radius: 16px; border: 3px solid var(--line); background: #fff; color: var(--ink);
  font-weight: 800; font-size: 18px; cursor: pointer; text-decoration: none; box-shadow: 0 4px 0 var(--line);
}
.btn:active:not(:disabled) { transform: translateY(3px); box-shadow: 0 1px 0 var(--line); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.primary { background: #f97316; border-color: #ea580c; color: #fff; box-shadow: 0 4px 0 #c2410c; }
.btn.primary:active { box-shadow: 0 1px 0 #c2410c; }
.btn.danger { color: var(--bad); border-color: #fecaca; }
.btn.small { padding: 6px 14px; font-size: 16px; }
.btn.big { font-size: 24px; padding: 14px 34px; }
.btn.flagged { background: #fee2e2; border-color: #fca5a5; }

/* ---------- kết quả ---------- */
.result-card { background: var(--card); border-radius: 28px; padding: 28px; text-align: center; box-shadow: var(--shadow); }
.result-card h1 { font-size: 42px; margin: 4px 0; }
.result-card.intro { text-align: left; max-width: 720px; margin: 0 auto; }
.result-card.intro h1, .result-card.intro > p { text-align: center; }
.rules { padding-left: 0; list-style: none; }
.rules li { padding: 8px 0; border-bottom: 1px dashed var(--line); }
.medal { font-size: 90px; line-height: 1; animation: pop .5s; }
.medal-name { font-family: var(--font-head); font-size: 26px; font-weight: 800; margin: 0; }
.result-card.gold { background: linear-gradient(180deg, #fef9c3, #fff 60%); }
.result-card.silver { background: linear-gradient(180deg, #f1f5f9, #fff 60%); }
.result-card.bronze { background: linear-gradient(180deg, #ffedd5, #fff 60%); }
.topic-bars { display: grid; gap: 10px; text-align: left; max-width: 640px; margin: 18px auto; }
.topic-bars.card { max-width: none; }
.tb { display: grid; grid-template-columns: 170px 1fr 56px; align-items: center; gap: 10px; }
.tb small { grid-column: 1 / -1; margin-top: -6px; color: var(--muted); }
.tb small .stars { font-size: 15px; letter-spacing: 0; }
.tip { margin: 6px 0 0; }

.review { display: grid; gap: 10px; }
.rv { background: var(--card); border-radius: 16px; padding: 12px 16px; box-shadow: var(--shadow); border-left: 6px solid var(--ok); }
.rv.bad { border-left-color: var(--bad); }
.rv summary { cursor: pointer; display: flex; gap: 12px; }
.rv-n { font-weight: 800; white-space: nowrap; }
.rv-q { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rv-body { margin-top: 10px; }
.rv-body .q-text { font-size: 19px; }
.rv-body .seq { font-size: 24px; }
.rv-body .fig { max-width: 240px !important; }

/* ---------- đề thi ---------- */
.exam-group { background: var(--card); border-radius: 24px; padding: 20px; margin-top: 18px; box-shadow: var(--shadow); }
.exam-group-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.exam-group-head h2 { margin: 0; font-size: 26px; }
.exam-group-head span { color: var(--muted); }
.exam-group-head .btn { margin-left: auto; }
.exam-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 10px; }
.exam-tile {
  display: flex; flex-direction: column; align-items: center; padding: 10px 6px; border-radius: 14px;
  border: 2px solid var(--line); text-decoration: none; color: var(--ink); background: #fff;
}
.exam-tile:hover { border-color: var(--primary); }
.exam-tile small { color: var(--muted); font-size: 13px; }
.exam-tile.gold { background: #fef9c3; border-color: #facc15; }
.exam-tile.silver { background: #f1f5f9; border-color: #94a3b8; }
.exam-tile.bronze { background: #ffedd5; border-color: #fb923c; }

.exam-bar {
  position: sticky; top: 58px; z-index: 10; display: flex; align-items: center; gap: 14px;
  background: #1e293b; color: #fff; padding: 10px 16px; border-radius: 18px; margin-bottom: 16px;
}
.exam-title { font-weight: 800; flex: 1; }
.timer { font-family: var(--font-head); font-weight: 800; font-size: 24px; background: #334155; color: #fff; padding: 2px 14px; border-radius: 12px; }
.timer.warn { background: #dc2626; animation: pulse 1s infinite; }
.exam-layout { display: grid; grid-template-columns: 1fr 250px; gap: 18px; align-items: start; }
.navgrid { background: var(--card); border-radius: 20px; padding: 16px; box-shadow: var(--shadow); position: sticky; top: 130px; }
.navgrid h3 { font-size: 18px; }
.nav-row { display: flex; gap: 6px; align-items: center; margin-bottom: 6px; }
.nav-row > span { width: 26px; }
.nav-q {
  width: 34px; height: 34px; border-radius: 10px; border: 2px solid var(--line); background: #fff;
  font-weight: 800; font-size: 14px; cursor: pointer; display: inline-grid; place-items: center; color: var(--ink);
}
.nav-q.answered { background: #dbeafe; border-color: #60a5fa; }
.nav-q.flag { background: #fee2e2; border-color: #f87171; }
.nav-q.cur { outline: 3px solid #f97316; outline-offset: 1px; }
.legend { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.legend .nav-q { width: 22px; height: 22px; font-size: 11px; cursor: default; }

/* ---------- tính nhẩm ---------- */
.speed { max-width: 560px; margin: 0 auto; background: var(--card); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); text-align: center; }
.speed-top { display: flex; justify-content: space-between; align-items: center; }
.speed-q { font-family: var(--font-head); font-size: 72px; font-weight: 800; margin: 20px 0 6px; border-radius: 20px; }
.speed .answer-area { justify-content: center; }
.flash-ok { animation: flashOk .45s; }
.flash-bad { animation: flashBad .45s; }

/* ---------- bảng ---------- */
.table-wrap { overflow-x: auto; background: var(--card); border-radius: 18px; box-shadow: var(--shadow); }
.hist { width: 100%; border-collapse: collapse; font-size: 16px; }
.hist th, .hist td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
.hist th { background: #f8fafc; }

/* ---------- hiệu ứng ---------- */
.shake { animation: shake .4s; }
.confetti { position: fixed; top: -12px; width: 10px; height: 16px; z-index: 100; pointer-events: none; animation: fall linear forwards; border-radius: 2px; }
@keyframes fall { to { transform: translateY(105vh) rotate(720deg); } }
@keyframes pop { 0% { transform: scale(.85); opacity: 0; } 100% { transform: scale(1); opacity: 1; } }
@keyframes shake { 20%, 60% { transform: translateX(-8px); } 40%, 80% { transform: translateX(8px); } }
@keyframes pulse { 50% { opacity: .7; } }
@keyframes flashOk { from { background: #bbf7d0; } to { background: transparent; } }
@keyframes flashBad { from { background: #fecaca; } to { background: transparent; } }

/* ---------- màn hình nhỏ ---------- */
@media (max-width: 800px) {
  .exam-layout { grid-template-columns: 1fr; }
  .navgrid { position: static; }
}
@media (max-width: 600px) {
  body { font-size: 17px; }
  .topbar { padding: 8px 12px; }
  .topbar nav a { padding: 4px 8px; font-size: 14px; }
  .topbar nav a:first-child { display: none; }
  .topbar { flex-wrap: wrap; row-gap: 4px; }
  .topbar nav { order: 3; width: 100%; justify-content: space-around; }
  .logo { font-size: 20px; }
  .hero { padding: 20px; }
  .qcard { padding: 18px 16px; }
  .q-text { font-size: 20px; }
  .seq { font-size: 26px; }
  .tb { grid-template-columns: 1fr 48px; }
  .tb > span { grid-column: 1 / -1; }
  .exam-bar { top: 52px; flex-wrap: wrap; }
  .exam-title { flex-basis: 100%; font-size: 15px; }
  .speed-q { font-size: 54px; }
  .topic-head { flex-direction: column; text-align: center; }
  .answer-area { justify-content: center; }
}

/* ---------- lộ trình bài học ---------- */
.sec-title small { font-size: 16px; font-family: var(--font); font-weight: 700; }
.path { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 12px; }
.lesson {
  display: flex; align-items: center; gap: 14px; padding: 12px 16px; background: var(--card);
  border-radius: 18px; box-shadow: var(--shadow); text-decoration: none; color: var(--ink);
  border: 3px solid transparent; transition: transform .15s;
}
.lesson:hover { transform: translateY(-3px); }
.lesson-n {
  flex: none; width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center;
  font: 800 22px var(--font-head); background: color-mix(in srgb, var(--c) 15%, white); color: var(--c);
}
.lesson.done .lesson-n { background: var(--c); color: #fff; }
.lesson.next { border-color: var(--c); animation: glow 2s infinite; }
.lesson-body { flex: 1; display: flex; flex-direction: column; line-height: 1.3; }
.lesson-body small { color: var(--muted); font-size: 14px; }
.lesson .stars { font-size: 18px; letter-spacing: 0; white-space: nowrap; }
.lesson-go { font-weight: 800; color: var(--c); white-space: nowrap; font-size: 15px; }
@keyframes glow { 50% { box-shadow: 0 0 0 6px color-mix(in srgb, var(--c) 20%, transparent), var(--shadow); } }

/* nút đọc lời giải */
.say {
  float: right; margin: -4px -6px 4px 10px; width: 38px; height: 38px; border-radius: 999px;
  border: 2px solid #fcd34d; background: #fff; cursor: pointer; font-size: 17px;
}
.say:hover { background: #fef3c7; }

/* ---------- tài khoản ---------- */
#acct { flex: none; }
.acct-chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 14px; border-radius: 999px;
  background: #fef3c7; border: 2px solid #fcd34d; color: var(--ink); font-weight: 800; text-decoration: none; white-space: nowrap;
}
.acct-chip.login { background: #f97316; border-color: #ea580c; color: #fff; }
.center-text { text-align: center; }
.small { font-size: 15px; }
code { background: #f1f5f9; padding: 1px 6px; border-radius: 6px; font-size: .9em; }
.auth-card { max-width: 460px; }
.auth-card .btn { width: 100%; }
.btn.google { background: #fff; gap: 10px; }
.btn.google .g { font: 800 20px var(--font-head); color: #4285f4; }
.or { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 14px; margin: 16px 0; }
.or::before, .or::after { content: ''; flex: 1; height: 2px; background: var(--line); }
.auth-form, .kid-form { display: grid; gap: 12px; }
.auth-form label, .lbl { display: grid; gap: 4px; font-weight: 800; font-size: 16px; margin: 0; }
.auth-form input, .kid-form input:not([type=checkbox]) {
  font: 600 18px var(--font); padding: 10px 14px; border: 3px solid #cbd5e1; border-radius: 14px; outline: none;
}
.auth-form input:focus, .kid-form input:focus { border-color: #f97316; }
.small-fb { font-size: 16px; margin: 10px 0; }
.acct-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; flex-wrap: wrap; }
.kids { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; margin: 10px 0 20px; }
.kid {
  position: relative; display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 18px 10px;
  background: var(--card); border: 3px solid transparent; border-radius: 22px; box-shadow: var(--shadow); cursor: pointer; color: var(--ink);
  transition: transform .15s;
}
.kid:hover { transform: translateY(-4px); }
.kid.cur { border-color: #f97316; }
.kid.add { border: 3px dashed #cbd5e1; box-shadow: none; background: transparent; }
.kid b { font: 800 22px var(--font-head); }
.kid small { color: var(--muted); font-weight: 700; }
.kid-av { font-size: 56px; line-height: 1.1; }
.kid-av.sm { font-size: 30px; }
.kid-cur { position: absolute; top: 8px; right: 8px; font-size: 12px; font-weight: 800; background: #f97316; color: #fff; padding: 1px 8px; border-radius: 999px; }
.kid-form { margin-bottom: 20px; }
.kid-form h2 { margin: 0; }
.avatars { display: flex; flex-wrap: wrap; gap: 8px; }
.av { font-size: 30px; width: 54px; height: 54px; border-radius: 16px; border: 3px solid var(--line); background: #fff; cursor: pointer; }
.av.sel { border-color: #f97316; background: #ffedd5; }
.check { display: flex; gap: 8px; align-items: center; font-weight: 700; }
.check input { width: 20px; height: 20px; }
.report { display: grid; gap: 14px; }
.rep-head { display: flex; align-items: center; gap: 10px; }
.rep-head b { font: 800 22px var(--font-head); flex: 1; }
.rep-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; margin: 10px 0; }
.rep-grid > div { display: flex; flex-direction: column; background: #f8fafc; border-radius: 12px; padding: 8px 12px; }
.rep-grid b { font: 800 24px var(--font-head); }
.rep-grid span { font-size: 13px; color: var(--muted); }
@media (max-width: 600px) { .acct-chip { padding: 3px 10px; font-size: 14px; } }

/* ---------- khu vực phụ huynh & mã PIN ---------- */
.card.flat.pin-card { max-width: 420px; margin: 0 auto 20px; text-align: center; border-left: none; border-top: 6px solid var(--c); padding: 20px; }
.pin-card h2 { margin: 0 0 4px; }
.pin-card .lbl { text-align: left; }
.pin-card input { font: 600 18px var(--font); padding: 10px 14px; border: 3px solid #cbd5e1; border-radius: 14px; outline: none; }
.pin-card .actions { justify-content: center; }
.pin-dots { display: flex; justify-content: center; gap: 16px; margin: 14px 0; }
.pin-dots span { width: 22px; height: 22px; border-radius: 50%; border: 3px solid #6366f1; }
.pin-dots span.on { background: #6366f1; }
.pin-pad { grid-template-columns: repeat(3, 64px); justify-content: center; margin: 0 auto; }
.pin-pad .kp { height: 56px; }
.parent-locked { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 24px; }
.parent-locked h2 { margin: 0; }
.parent-locked p { margin: 4px 0 0; }
.parent-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-top: 24px; }
.parent-head .sec-title { margin: 0; }
.parent-head .actions { margin: 0; }
.badge-open { font: 700 14px var(--font); background: #dcfce7; color: #166534; padding: 2px 10px; border-radius: 999px; vertical-align: middle; }
.rep-head { flex-wrap: wrap; }

/* ---------- bảng xếp hạng ---------- */
.btn.lb-on { border-color: #fcd34d; background: #fffbeb; }
.rank-hero {
  position: relative; overflow: hidden; text-align: center; padding: 26px 20px 22px; border-radius: 28px; color: #fff;
  background: radial-gradient(circle at 20% 10%, rgba(255,255,255,.35) 0 12%, transparent 13%), radial-gradient(circle at 85% 30%, rgba(255,255,255,.25) 0 8%, transparent 9%),
    linear-gradient(135deg, #f59e0b, #f97316 55%, #ec4899); box-shadow: var(--shadow);
}
.rank-hero h1 { font-size: clamp(32px, 6vw, 46px); margin: 2px 0 4px; text-shadow: 0 3px 0 rgba(124, 45, 18, .25); }
.rank-hero p { margin: 0; font-size: 18px; opacity: .95; }
.rank-trophy { font-size: 64px; line-height: 1; animation: floaty 3s ease-in-out infinite; filter: drop-shadow(0 6px 8px rgba(0,0,0,.2)); }
.rank-tabs { display: flex; flex-direction: column; align-items: center; gap: 10px; margin: 18px 0 8px; }
.seg { display: inline-flex; flex-wrap: wrap; justify-content: center; gap: 4px; background: #fff; padding: 5px; border-radius: 999px; box-shadow: var(--shadow); max-width: 100%; }
.seg button { border: none; background: transparent; padding: 9px 18px; border-radius: 999px; font: 800 16px var(--font); cursor: pointer; color: var(--ink); }
.seg button.on { background: linear-gradient(135deg, #f59e0b, #f97316); color: #fff; box-shadow: 0 3px 0 #c2410c; }
.chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.chip { border: 2px solid var(--line); background: #fff; border-radius: 999px; padding: 6px 14px; font: 700 15px var(--font); cursor: pointer; color: var(--ink); }
.chip.on { background: #1e293b; border-color: #1e293b; color: #fff; }
.rank-body { max-width: 720px; margin: 10px auto 0; }

/* bục vinh quang */
.podium { display: grid; grid-template-columns: repeat(3, 1fr); align-items: end; gap: 12px; margin: 34px auto 14px; max-width: 560px; }
.pod { display: flex; flex-direction: column; align-items: center; text-align: center; position: relative; min-width: 0; }
.podium:has(.pod:only-child) { grid-template-columns: 1fr; max-width: 200px; }
.pod-av { font-size: 44px; width: 76px; height: 76px; display: grid; place-items: center; border-radius: 50%; background: #fff; border: 4px solid #e2e8f0; box-shadow: var(--shadow); }
.pod-1 .pod-av { width: 92px; height: 92px; font-size: 54px; border-color: #facc15; }
.pod-2 .pod-av { border-color: #cbd5e1; }
.pod-3 .pod-av { border-color: #fdba74; }
.crown { position: absolute; top: -30px; font-size: 32px; animation: floaty 2.4s ease-in-out infinite; }
.pod-name { font: 800 18px var(--font-head); margin-top: 6px; max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pod-val { font-size: 15px; color: var(--muted); margin-bottom: 6px; }
.pod-val b { font: 800 22px var(--font-head); color: var(--ink); }
.pod-step { width: 100%; border-radius: 16px 16px 6px 6px; display: grid; place-items: start center; padding-top: 8px; font-size: 32px; box-shadow: var(--shadow); }
.pod-1 .pod-step { height: 110px; background: linear-gradient(180deg, #fde047, #f59e0b); }
.pod-2 .pod-step { height: 80px; background: linear-gradient(180deg, #f1f5f9, #cbd5e1); }
.pod-3 .pod-step { height: 60px; background: linear-gradient(180deg, #fed7aa, #fb923c); }
.pod.me .pod-av { outline: 4px solid #f97316; outline-offset: 2px; }
.rk-tag { display: inline-block; font: 800 11px var(--font); background: #e2e8f0; color: #334155; padding: 1px 8px; border-radius: 999px; margin-left: 6px; vertical-align: middle; }
.rk-tag.me { background: #f97316; color: #fff; }
.pod > .rk-tag { margin: 2px 0 0; }

/* danh sách từ hạng 4 */
.rk-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.rk-list li { display: flex; align-items: center; gap: 12px; padding: 10px 16px; background: #fff; border-radius: 18px; box-shadow: var(--shadow); }
.rk-list li.ours { background: #fff7ed; }
.rk-list li.me { background: #ffedd5; outline: 3px solid #f97316; }
.rk-n { width: 34px; height: 34px; flex: none; display: grid; place-items: center; border-radius: 50%; background: #f1f5f9; font: 800 16px var(--font-head); color: #475569; }
.rk-av { font-size: 30px; flex: none; }
.rk-name { flex: 1; min-width: 0; font-weight: 800; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rk-val { white-space: nowrap; color: var(--muted); font-size: 14px; }
.rk-val b { font: 800 20px var(--font-head); color: var(--ink); }

/* thứ hạng của bé */
.rank-me {
  display: flex; align-items: center; gap: 14px; margin-top: 16px; padding: 14px 18px; border-radius: 22px; color: #fff;
  background: linear-gradient(135deg, #1e293b, #334155); box-shadow: var(--shadow);
}
.rm-av { font-size: 40px; flex: none; }
.rm-text { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.rm-text b { font: 800 20px var(--font-head); }
.rm-text small { opacity: .85; font-size: 14px; }
.rm-stat { display: flex; flex-direction: column; align-items: center; background: rgba(255,255,255,.12); padding: 6px 14px; border-radius: 14px; min-width: 70px; }
.rm-stat span { font-size: 12px; opacity: .8; white-space: nowrap; }
.rm-stat b { font: 800 24px var(--font-head); color: #fde047; }

.rank-empty { text-align: center; padding: 34px 16px; background: #fff; border-radius: 24px; box-shadow: var(--shadow); color: var(--muted); }
.rank-empty .big-ico, .rank-empty .spin { font-size: 52px; }
.rank-empty .spin { display: inline-block; animation: spin 1.2s linear infinite; }
.rank-empty p { margin: 8px 0 0; font-size: 18px; }
.rank-note { text-align: center; margin: 16px auto 0; padding: 10px 16px; max-width: 720px; background: #fef3c7; border-radius: 16px; }
.rank-foot { text-align: center; color: var(--muted); font-size: 14px; max-width: 640px; margin: 18px auto 0; }
@keyframes floaty { 50% { transform: translateY(-6px); } }
@keyframes spin { to { transform: rotate(360deg); } }
@media (max-width: 600px) {
  .seg button { padding: 7px 12px; font-size: 14px; }
  .chip { font-size: 13px; padding: 5px 10px; }
  .topbar nav a { padding: 4px 6px; }
  .podium { gap: 6px; }
  .pod-av { width: 60px; height: 60px; font-size: 34px; }
  .pod-1 .pod-av { width: 72px; height: 72px; font-size: 42px; }
  .pod-name { font-size: 15px; }
  .pod-val b { font-size: 18px; }
  .rank-me { flex-wrap: wrap; }
  .rm-text { flex-basis: calc(100% - 60px); }
  .rm-stat { flex: 1; }
}
@media (prefers-reduced-motion: reduce) { .rank-trophy, .crown, .rank-empty .spin { animation: none; } }

/* ---------- quà Thử thách hôm nay ---------- */
.daily { background: linear-gradient(120deg, #fffbeb, #fff 45%, #fff7ed); border-width: 3px; }
.daily:not(.done) { border-style: solid; border-color: #f59e0b; box-shadow: 0 0 0 0 rgba(245, 158, 11, .5), var(--shadow); animation: dailyGlow 2.2s infinite; }
.daily-text { flex: 1; }
.daily-text b { color: #b45309; }
.gift {
  flex: none; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0;
  min-width: 118px; padding: 10px 14px; border-radius: 20px; color: #fff; text-align: center;
  background: linear-gradient(160deg, #f59e0b, #f97316 60%, #ec4899); box-shadow: 0 5px 0 #c2410c;
}
.gift-ico { font-size: 34px; line-height: 1; animation: giftWiggle 1.6s infinite; }
.gift b { font: 800 26px var(--font-head); line-height: 1.1; white-space: nowrap; }
.gift small { font-weight: 800; font-size: 13px; opacity: .95; white-space: nowrap; }
.gift.got { background: linear-gradient(160deg, #22c55e, #16a34a); box-shadow: 0 5px 0 #15803d; }
.gift.got .gift-ico { animation: none; }
.bonus-banner {
  display: inline-block; margin-bottom: 10px; padding: 12px 20px; border-radius: 18px; font-weight: 800; font-size: 20px;
  background: linear-gradient(120deg, #fef3c7, #ffedd5); border: 3px solid #f59e0b; animation: pop .5s;
}
@keyframes giftWiggle { 0%, 60%, 100% { transform: rotate(0) scale(1); } 70% { transform: rotate(-14deg) scale(1.1); } 80% { transform: rotate(12deg) scale(1.1); } 90% { transform: rotate(-6deg); } }
@keyframes dailyGlow { 0% { box-shadow: 0 0 0 0 rgba(245, 158, 11, .45), var(--shadow); } 70% { box-shadow: 0 0 0 12px rgba(245, 158, 11, 0), var(--shadow); } 100% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0), var(--shadow); } }
@media (max-width: 600px) {
  .daily { flex-wrap: wrap; }
  .daily-ico { font-size: 36px; }
  .gift { flex-direction: row; gap: 8px; width: 100%; min-width: 0; }
  .gift b { font-size: 22px; }
}
@media (prefers-reduced-motion: reduce) { .gift-ico, .daily:not(.done) { animation: none; } }
main > .daily:first-child { margin: 0 0 18px; }

/* Chọn lớp 1 – 5 */
.grade-pill { display: inline-block; font: 800 13px var(--font); background: #dbeafe; color: #1d4ed8; padding: 2px 10px; border-radius: 999px; vertical-align: middle; }
.rep-head .grade-pill { margin-right: auto; }
.grade-set { display: grid; gap: 6px; margin-bottom: 16px; }
.grade-set label { font-weight: 800; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.grade-set select, .lbl select {
  font: 800 17px var(--font); padding: 8px 12px; border: 2px solid #cbd5e1; border-radius: 12px; background: #fff; color: var(--ink);
}
.lbl select { max-width: 200px; }
.pod-grade { font: 700 12px var(--font); color: var(--muted); }
.rk-grade { font: 700 12px var(--font); color: var(--muted); margin-left: 6px; }

/* Vinh danh top 3 tuần trên trang chủ */
.fame { margin: 22px 0 0; padding: 18px 20px; border-radius: 24px; background: linear-gradient(135deg, #fffbeb, #fff7ed); border: 3px solid #fcd34d; box-shadow: var(--shadow); }
.fame-head { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 12px; margin-bottom: 12px; }
.fame-head h2 { margin: 0; font: 800 24px var(--font-head); }
.fame-more { margin-left: auto; font-weight: 800; white-space: nowrap; }
.fame-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.fame-list > p { grid-column: 1 / -1; margin: 0; }
.fame-item { display: flex; align-items: center; gap: 10px; padding: 10px 14px; background: #fff; border-radius: 18px; box-shadow: 0 3px 0 #fde68a; min-width: 0; }
.fame-1 { box-shadow: 0 3px 0 #f59e0b; background: #fefce8; }
.fame-item.me { outline: 3px solid #f97316; }
.fame-medal { font-size: 28px; flex: none; }
.fame-av { font-size: 34px; flex: none; }
.fame-name { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.fame-name b { font: 800 18px var(--font-head); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fame-name .rk-tag { margin: 2px 0 0; align-self: flex-start; }
.fame-name small { color: var(--muted); font-weight: 700; font-size: 12px; }
.fame-val { white-space: nowrap; color: var(--muted); }
.fame-val b { font: 800 22px var(--font-head); color: var(--ink); }
.fame-empty { font-size: 16px; }
@media (max-width: 760px) { .fame-list { grid-template-columns: 1fr; } .fame-more { margin-left: 0; } }