/* v6: trang chủ mới, khoá học, ôn tập, Olympia, lời văn hay */
.tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:18px 0}
.tile{position:relative;overflow:hidden;border-radius:22px;padding:20px 18px;color:#fff;text-decoration:none;min-height:140px;display:flex;flex-direction:column;justify-content:flex-end;box-shadow:0 8px 22px #0002;transition:transform .2s}
.tile:hover{transform:translateY(-4px) rotate(-.4deg)}.tile h3{margin:0;font:800 20px 'Baloo 2',sans-serif}.tile p{margin:2px 0 0;opacity:.9;font-size:13px}
.t-ic{position:absolute;right:12px;top:6px;font-size:54px;opacity:.9;filter:drop-shadow(0 4px 6px #0003)}
.t-course{background:linear-gradient(135deg,#3b4a9c,#6f7fe0)}.t-review{background:linear-gradient(135deg,#12919b,#2faa68)}.t-oly{background:linear-gradient(135deg,#e5604a,#f5a623)}.t-quote{background:linear-gradient(135deg,#7a5af0,#c93a5e)}
.today{margin:20px 0}.today-h{display:flex;align-items:baseline;justify-content:space-between}.today-h a{font-weight:700}
.qcard{position:relative;border-radius:22px;padding:24px 26px 18px;background:var(--card,#fff);border:1px solid var(--line,#0001);box-shadow:0 6px 20px #0001;overflow:hidden;border-left:6px solid #7a5af0}
.qcard.bac{border-left-color:#e5604a}.qcard.tg{border-left-color:#12919b}
.q-mark{position:absolute;right:16px;top:-14px;font:800 120px/1 'Noto Serif',serif;opacity:.08}
.qcard blockquote{margin:0 0 8px;font:600 clamp(18px,2.4vw,24px)/1.5 'Noto Serif',serif}.qcard footer{font-weight:700;opacity:.75;margin-bottom:10px}
.q-tags{display:flex;gap:6px;flex-wrap:wrap}.q-tags span{font-size:12px;padding:2px 10px;border-radius:99px;background:#8a93c922}
.q-use,.q-lead{margin:8px 0 0;font-size:14px}.q-lead{padding:8px 12px;border-radius:12px;background:#f5a62318}
.q-act{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.q-save.on{background:#f5a623;color:#3a2600;border-color:#f5a623}
.qhero{border-radius:26px;padding:26px 28px;background:linear-gradient(135deg,#7a5af0,#c93a5e);color:#fff;margin-bottom:16px}.qhero h1{margin:4px 0;font:800 clamp(28px,4vw,40px) 'Baloo 2',sans-serif}.qhero p{margin:0 0 14px;max-width:560px;opacity:.95}
.seg{display:inline-flex;gap:4px;padding:4px;border-radius:99px;background:#ffffff2a;flex-wrap:wrap}.seg button{border:0;padding:8px 16px;border-radius:99px;background:transparent;color:#fff;font-weight:700;font-size:14px;font-family:inherit;cursor:pointer}.seg button.on{background:#fff;color:#7a2fa0}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 16px}.chips button{border:1px solid var(--line,#0002);background:var(--card,#fff);color:inherit;padding:6px 14px;border-radius:99px;cursor:pointer;font-weight:600;font-size:13px;font-family:inherit}.chips button.on{background:#4b5bb0;color:#fff;border-color:#4b5bb0}
.q-stage{animation:pop .35s ease}@keyframes pop{from{opacity:0;transform:translateY(10px) scale(.98)}}
.qlist{display:grid;gap:14px}
.para{margin:0 0 16px;padding:18px 20px;border-radius:18px;background:var(--card,#fff);border:1px solid var(--line,#0001)}.para small{font-weight:800;letter-spacing:.05em;opacity:.6;text-transform:uppercase;font-size:11px}.para h3{margin:2px 0 8px;font:800 19px 'Baloo 2',sans-serif}.para p{margin:0;line-height:1.85;font-family:'Noto Serif',serif}
.seg-o{background:#2c9ad826;border-radius:6px;padding:1px 3px}.seg-b{background:#f5a62326;border-radius:6px;padding:1px 3px}.seg-k{background:#2faa6826;border-radius:6px;padding:1px 3px}
.legend{display:flex;gap:12px;flex-wrap:wrap;margin-top:10px;font-size:12px;opacity:.8;align-items:center}.legend i{width:12px;height:12px;border-radius:4px;display:inline-block}.legend .o{background:#2c9ad8}.legend .b{background:#f5a623}.legend .k{background:#2faa68}
/* khoá học */
.course-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:14px}
.course{position:relative;border-radius:24px;padding:22px;background:var(--card,#fff);border:2px solid transparent;box-shadow:0 8px 24px #0001;overflow:hidden}
.course::before{content:'';position:absolute;inset:0 0 auto 0;height:8px;background:var(--c)}.course.cur{border-color:var(--c)}
.course-top{display:flex;gap:14px;align-items:center}.course-no{width:70px;height:70px;border-radius:22px;display:grid;place-items:center;font:800 40px 'Baloo 2',sans-serif;color:#fff;background:var(--c);transform:rotate(-5deg);box-shadow:0 6px 14px #0003}
.course small{font-weight:800;letter-spacing:.06em;opacity:.65;font-size:11px}.course h2{margin:0;font:800 21px 'Baloo 2',sans-serif}
.course-meta{display:flex;gap:18px;list-style:none;padding:0;margin:8px 0 12px}.course-meta li{font-size:13px;opacity:.85}.course-meta b{font-size:20px;color:var(--c);display:block;line-height:1.1}
.course-act{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
/* ôn tập */
.rv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:14px 0 22px}
.rv{display:block;padding:18px;border-radius:20px;background:var(--card,#fff);border:1px solid var(--line,#0001);border-top:5px solid var(--c);text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s}.rv:hover{transform:translateY(-3px);box-shadow:0 10px 22px #0002}
.rv span{font-size:34px}.rv h3{margin:6px 0 2px;font:800 17px 'Baloo 2',sans-serif}.rv p{margin:0;font-size:13px;opacity:.75}
.unit-chips{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px}.unit-chips a{padding:12px 14px;border-radius:16px;background:var(--card,#fff);border:1px solid var(--line,#0001);border-left:6px solid var(--c);text-decoration:none;color:inherit;display:grid;gap:4px}.unit-chips b{color:var(--c)}.unit-chips span{font-size:13.5px;font-weight:600}.unit-chips em{font-size:12px;font-style:normal;opacity:.7}
/* olympia */
.oly-hero{display:grid;grid-template-columns:1.2fr 1fr;gap:10px;align-items:center;border-radius:28px;padding:26px 28px;color:#fff;background:linear-gradient(160deg,#2b3480,#4b5bb0 55%,#e5604a);margin-bottom:20px;overflow:hidden}
.oly-hero h1{margin:4px 0;font:800 clamp(30px,4.5vw,46px) 'Baloo 2',sans-serif}.oly-hero p{opacity:.95}.oly-stat{display:flex;gap:22px;margin:14px 0}.oly-stat b{font:800 30px 'Baloo 2',sans-serif;display:block;line-height:1}.oly-stat small{opacity:.8}
.btn-lg{padding:13px 26px;font-size:17px}.mtn{width:100%;max-width:300px;justify-self:center}.climber{transition:transform .8s cubic-bezier(.3,1.4,.5,1)}
.oly-play{max-width:900px;margin:0 auto}.oly-top{display:flex;gap:16px;align-items:center;font-weight:800;padding:10px 16px;border-radius:99px;background:#4b5bb0;color:#fff;margin-bottom:14px}.oly-top .camp{flex:1}
.oly-body{display:grid;grid-template-columns:210px 1fr;gap:18px}.oly-mt{border-radius:22px;background:linear-gradient(#cfe3ff,#f4f1ea);padding:8px;align-self:start}
.oly-q{background:var(--card,#fff);border-radius:22px;padding:18px 20px;border:1px solid var(--line,#0001)}.oly-q h2{font:700 20px/1.45 'Be Vietnam Pro',sans-serif;margin:12px 0}
.timer{position:relative;height:26px;border-radius:99px;background:#8a93c933;overflow:hidden}.timer i{position:absolute;inset:0 auto 0 0;background:linear-gradient(90deg,#2faa68,#f5a623);transition:width .1s linear}.timer.low i{background:#d9534f}.timer b{position:absolute;right:12px;top:2px;font-size:14px}
.oly-opts{display:grid;gap:10px}.oly-opt{display:flex;gap:12px;align-items:center;text-align:left;padding:12px 14px;border-radius:14px;border:2px solid #8a93c944;background:transparent;color:inherit;font:600 15.5px inherit;cursor:pointer;transition:.15s}.oly-opt:hover:not(:disabled){border-color:#4b5bb0;transform:translateX(4px)}
.oly-opt kbd{flex:none;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:#4b5bb0;color:#fff;font-weight:800;font-size:13px;font-family:inherit}.oly-opt.ok{background:#2faa6826;border-color:#2faa68}.oly-opt.bad{background:#d9534f22;border-color:#d9534f}.oly-opt.gone{opacity:.25}
.oly-help{display:flex;gap:8px;margin:14px 0 6px}.oly-help button{padding:6px 14px;border-radius:99px;border:2px solid #e0901a;background:transparent;color:inherit;font-weight:700;font-size:13px;font-family:inherit;cursor:pointer}.oly-help button:disabled{opacity:.35;cursor:default;border-style:dashed}
.oly-end{display:grid;grid-template-columns:240px 1fr;gap:24px;align-items:center;max-width:820px;margin:0 auto}.oly-end h1{font:800 32px 'Baloo 2',sans-serif;margin:0}.stars{font-size:46px;letter-spacing:6px}.stars span{opacity:.2}.stars .on{opacity:1;color:#f5a623;text-shadow:0 3px 8px #f5a62366}
.oly-msg{font-size:17px;font-weight:600}.rec{font-weight:800;color:#e5604a}
.lb{list-style:none;padding:0;margin:0;display:grid;gap:8px}.lb li{display:grid;grid-template-columns:40px 1fr auto auto;gap:12px;align-items:center;padding:10px 14px;border-radius:14px;background:var(--card,#fff);border:1px solid var(--line,#0001)}.lb li.me{border-color:#4b5bb0;background:#4b5bb012}.lb em{font-style:normal;font-weight:800;color:#e5604a}.lb small{opacity:.65}
[data-theme=dark] .oly-mt{background:linear-gradient(#25305e,#1c2033)}
@media(max-width:900px){.tiles,.rv-grid{grid-template-columns:repeat(2,1fr)}.course-grid{grid-template-columns:1fr}.oly-hero{grid-template-columns:1fr}.oly-body,.oly-end{grid-template-columns:1fr}.oly-mt{max-width:200px;margin:0 auto}}
@media(max-width:480px){.tiles,.rv-grid{grid-template-columns:1fr 1fr;gap:10px}.tile{min-height:112px;padding:14px}.t-ic{font-size:40px}}
@media(prefers-reduced-motion:reduce){.climber,.q-stage,.tile,.rv{transition:none;animation:none}}