/* ===== Bloom Mindset — concept VŨ TRỤ NEON (xanh dương · tím · hồng) theo cover + logo kênh =====
   Responsive: phone → tablet → laptop → màn hình lớn → TV */
:root{
  color-scheme:dark;
  --bg:#05031a; --card:rgba(20,15,64,.78); --card-solid:#140f40; --ink:#eef0ff; --muted:#aeb1dc; --line:rgba(125,135,255,.32);
  --blue:#3aa0ff; --cyan:#58e4ff; --violet:#8b5cf6; --pink:#ff3fd0; --green:#3ee6a0; --yellow:#ffd23f; --bad:#ff5c7a;
  --grad:linear-gradient(90deg,#2f7bff,#8b3dff 55%,#e11fb4);
  --glow:0 0 18px rgba(88,150,255,.45);
  --r:20px; --shadow:0 8px 28px rgba(0,0,0,.45);
}
*{box-sizing:border-box}
html{font-size:16px;-webkit-text-size-adjust:100%}
@media(min-width:1600px){html{font-size:18px}}
@media(min-width:1900px){html{font-size:21px}}
@media(min-width:2500px){html{font-size:28px}}
body{margin:0;color:var(--ink);font-family:"Segoe UI",system-ui,-apple-system,Roboto,"Helvetica Neue",Arial,sans-serif;line-height:1.55;padding-bottom:76px;
  background:
    radial-gradient(1200px 700px at 12% -10%,rgba(120,70,255,.38),transparent 60%),
    radial-gradient(900px 600px at 92% 8%,rgba(255,63,208,.22),transparent 60%),
    radial-gradient(1000px 700px at 50% 112%,rgba(40,110,255,.28),transparent 60%),
    #05031a;
  background-attachment:fixed}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:-1;opacity:.6;
  background-image:radial-gradient(1px 1px at 20px 30px,#fff,transparent),radial-gradient(1.5px 1.5px at 95px 125px,#aee,transparent),radial-gradient(1px 1px at 165px 70px,#fbf,transparent),radial-gradient(1px 1px at 55px 170px,#fff,transparent);
  background-size:210px 210px}
body.tv{font-size:1.2rem}
h1{font-size:clamp(1.6rem,3.2vw,2.4rem);line-height:1.2;margin:.4em 0;text-shadow:0 0 22px rgba(120,140,255,.45)}
h2{font-size:clamp(1.25rem,2.2vw,1.7rem);margin:1.4em 0 .6em}
a{color:#7fd3ff}
img{max-width:100%}
code{background:rgba(255,255,255,.1);padding:.1em .4em;border-radius:6px;font-size:.9em}
.muted{color:var(--muted)} .small{font-size:.85rem} .center{text-align:center} .grow{flex:1}
.sr{position:absolute;left:-9999px}
.skip{position:absolute;left:-9999px;top:0;background:#000;color:#fff;padding:8px 12px;z-index:100}
.skip:focus{left:8px;top:8px}
.wrap{max-width:1180px;margin:0 auto;padding:0 16px}
.wrap.narrow{max-width:760px}
@media(min-width:1900px){.wrap{max-width:1500px}.wrap.narrow{max-width:960px}}
@media(min-width:2500px){.wrap{max-width:2000px}}
main{outline:none;min-height:60vh;padding-bottom:24px}
section.wrap{margin-top:8px;margin-bottom:8px}

:focus-visible{outline:4px solid var(--yellow);outline-offset:3px;border-radius:10px}
body.tv :focus-visible{outline:6px solid var(--yellow);box-shadow:0 0 0 10px rgba(255,210,63,.35)}

/* ===== nút ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4em;border:2px solid transparent;background:var(--grad);color:#fff;font:inherit;font-weight:700;padding:.65em 1.2em;border-radius:999px;cursor:pointer;text-decoration:none;min-height:44px;transition:transform .12s,box-shadow .15s;box-shadow:0 0 16px rgba(139,61,255,.45)}
.btn:hover{transform:translateY(-2px);box-shadow:0 0 26px rgba(255,63,208,.6)}
.btn:disabled{opacity:.5;cursor:default;transform:none;box-shadow:none}
.btn.ghost{background:rgba(255,255,255,.04);color:#cfe3ff;border-color:rgba(120,170,255,.7);box-shadow:none}
.btn.ghost:hover{background:rgba(88,150,255,.18);box-shadow:var(--glow)}
.btn.small{padding:.4em .9em;min-height:36px;font-size:.9rem}
.btn.big{font-size:1.1rem;padding:.8em 1.6em}
.btn.block{display:flex;width:100%}
.row{display:flex;flex-wrap:wrap;gap:10px;margin:12px 0}
.row.center{justify-content:center}

/* ===== header / nav ===== */
.top{position:sticky;top:0;z-index:50;background:rgba(5,3,26,.82);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bar-row{display:flex;align-items:center;gap:16px;min-height:64px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-size:1.1rem;margin-right:auto}
.logo-img{width:42px;height:42px;border-radius:50%;box-shadow:0 0 14px rgba(255,63,208,.6),0 0 18px rgba(58,160,255,.5)}
.logo b{background:linear-gradient(90deg,var(--cyan),#ff6fe0);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav{display:none;gap:4px}
.nav a,.bottom a{color:var(--ink);text-decoration:none;font-weight:600;padding:.5em .9em;border-radius:999px}
.nav a:hover,.nav a.active{background:rgba(139,92,246,.25);color:#fff;box-shadow:inset 0 0 0 1px var(--line),var(--glow)}
.chip{display:inline-flex;gap:10px;align-items:center;background:rgba(255,255,255,.06);border:1px solid var(--line);padding:.35em .9em;border-radius:999px;text-decoration:none;color:var(--ink);font-size:.9rem}
.chip b{color:var(--cyan)}
.chip,.logo b{white-space:nowrap}
@media(max-width:560px){.chip{gap:6px;padding:.3em .6em;font-size:.8rem}.bar-row{gap:8px}.logo{font-size:1rem}.logo-img{width:36px;height:36px}}
@media(min-width:860px){.nav{display:flex}.logo{margin-right:0}.bar-row{justify-content:space-between}body{padding-bottom:0}.bottom{display:none!important}}
.bottom{position:fixed;left:0;right:0;bottom:0;z-index:50;display:flex;justify-content:space-around;background:rgba(8,5,34,.94);backdrop-filter:blur(10px);border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom))}
.bottom a{display:flex;flex-direction:column;align-items:center;font-size:.72rem;padding:.2em .6em;color:var(--muted)}
.bottom a span{font-size:1.4rem;line-height:1.1}
.bottom a.active{color:#fff;text-shadow:0 0 10px var(--pink)}

/* ===== thẻ + lưới ===== */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:var(--shadow),inset 0 0 0 1px rgba(255,255,255,.03);backdrop-filter:blur(6px)}
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(min(100%,210px),1fr));margin:12px 0}
.grid.g2{grid-template-columns:repeat(auto-fill,minmax(min(100%,420px),1fr))}
.grid.g3{grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr))}
.sec-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-top:28px}
.sec-head h2{margin:0}
.lead{font-size:clamp(1.05rem,1.6vw,1.3rem);color:var(--muted)}
.note{background:rgba(255,210,63,.1);border:1px dashed rgba(255,210,63,.7);border-radius:12px;padding:10px 14px;margin:12px 0;font-size:.92rem}
.tags{display:flex;gap:6px;flex-wrap:wrap}
.tags i{font-style:normal;font-size:.75rem;background:rgba(88,228,255,.14);color:var(--cyan);border:1px solid rgba(88,228,255,.35);padding:.15em .7em;border-radius:999px;font-weight:700}

.topic-card,.game-card{display:flex;flex-direction:column;gap:4px;text-decoration:none;color:var(--ink);background:linear-gradient(160deg,var(--card) 35%,color-mix(in srgb,var(--c,#8b5cf6) 38%,#0b0830));transition:transform .15s,box-shadow .2s,border-color .2s}
.game-card{--c:#8b5cf6}
.topic-card:hover,.game-card:hover{transform:translateY(-4px);border-color:var(--cyan);box-shadow:0 0 24px rgba(88,150,255,.45)}
.t-ico{font-size:2.4rem;line-height:1.1}.t-ico.xl{font-size:3.4rem}
.topic-head{display:flex;flex-wrap:wrap;align-items:center;gap:16px;background:linear-gradient(120deg,color-mix(in srgb,var(--c) 40%,#0b0830),#0b0830 70%);border:1px solid var(--line);border-radius:var(--r);padding:16px 20px;margin:12px 0}
.topic-head .btn{margin-left:auto}

/* ===== hero (dùng ảnh cover của kênh) ===== */
.hero-banner{position:relative;margin-top:18px;border-radius:26px;overflow:hidden;border:1px solid var(--line);box-shadow:0 0 44px rgba(139,92,246,.4);
  background:linear-gradient(90deg,rgba(5,3,26,.97) 0%,rgba(5,3,26,.93) 45%,rgba(5,3,26,.4) 100%),url(../img/cover.webp) 25% center/cover}
@media(max-width:759px){.hero-banner{background:linear-gradient(180deg,rgba(5,3,26,.9),rgba(5,3,26,.82)),url(../img/cover.webp) 25% center/cover}}
.hero{display:grid;gap:12px;align-items:center;padding:28px 22px}
@media(min-width:760px){.hero{grid-template-columns:1.4fr 1fr;padding:44px 40px}}
.eyebrow{font-weight:700;color:var(--cyan);letter-spacing:.06em;text-transform:uppercase;font-size:.8rem}
.hl{background:linear-gradient(90deg,var(--cyan),#ff6fe0);-webkit-background-clip:text;background-clip:text;color:transparent;text-shadow:none}
.hero-art{text-align:center}
.hero-logo{width:min(300px,62vw);border-radius:50%;box-shadow:0 0 40px rgba(255,63,208,.55),0 0 70px rgba(58,160,255,.45);animation:float 5s ease-in-out infinite}
@keyframes float{50%{transform:translateY(-10px)}}

.checkin,.newsletter{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;background:linear-gradient(120deg,var(--card),rgba(139,61,255,.28))}
.checkin h2,.newsletter h2{margin:0 0 4px}
.nl-form{display:flex;flex-wrap:wrap;gap:8px;flex:1 1 320px}
.nl-form input,.auth input,.pick select{font:inherit;color:var(--ink);padding:.7em 1em;border:1px solid var(--line);border-radius:12px;background:rgba(255,255,255,.07);min-height:44px}
.nl-form input::placeholder,.auth input::placeholder{color:#8185b8}
.nl-form input{flex:1 1 200px}
.nl-msg{flex-basis:100%;margin:0;min-height:1.3em;font-size:.9rem}.nl-msg.ok{color:var(--green)}.nl-msg.bad{color:var(--bad)}
.auth label{display:block;font-weight:700;margin-top:12px}.auth input{width:100%}
.pick{display:flex;gap:12px;align-items:center;flex-wrap:wrap}

/* ===== video / blog ===== */
.video-card{padding:0;overflow:hidden;text-decoration:none;color:var(--ink);transition:transform .15s,box-shadow .2s}
.video-card:hover,.post-card:hover{transform:translateY(-3px);box-shadow:0 0 24px rgba(139,92,246,.5)}
.v-thumb{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,color-mix(in srgb,var(--c) 45%,#0b0830),#0b0830);display:grid;place-items:center;overflow:hidden}
.v-thumb img{width:100%;height:100%;object-fit:cover}
.v-ico{font-size:3.6rem}
.play{position:absolute;right:10px;bottom:10px;background:var(--grad);color:#fff;border-radius:999px;width:38px;height:38px;display:grid;place-items:center;box-shadow:var(--glow)}
.sample{position:absolute;left:8px;top:8px;background:rgba(0,0,0,.6);color:var(--muted);font-size:.7rem;font-style:normal;padding:.1em .6em;border-radius:999px;border:1px solid var(--line)}
.v-body{padding:14px;display:flex;flex-direction:column;gap:6px}
.post-card{display:flex;gap:14px;text-decoration:none;color:var(--ink);align-items:flex-start;transition:transform .15s,box-shadow .2s}
.post-card>div{display:flex;flex-direction:column;gap:6px}
.p-ico{font-size:2.4rem}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}
.chip-btn{font:inherit;color:var(--ink);border:1px solid var(--line);background:rgba(255,255,255,.05);border-radius:999px;padding:.4em 1em;cursor:pointer;min-height:40px}
.chip-btn:hover{border-color:var(--cyan)}
.chip-btn.on{background:var(--grad);border-color:transparent;color:#fff;box-shadow:var(--glow)}
.prose{font-size:1.08rem}.prose p{margin:1em 0}.prose ul{padding-left:1.2em}
.about-art{text-align:center}
.about-art img{width:150px;border-radius:50%;box-shadow:0 0 34px rgba(255,63,208,.55),0 0 50px rgba(58,160,255,.4)}

/* ===== hình từ vựng (ô sáng để emoji nổi trên nền tối) ===== */
.pic{display:grid;place-items:center;background:radial-gradient(circle at 30% 25%,#fff,var(--c,#d7d0ff) 75%);border-radius:24px;border:2px solid var(--cyan);width:120px;height:120px;font-size:3.8rem;margin:0 auto;box-shadow:0 0 22px rgba(88,150,255,.6)}
.pic img{width:100%;height:100%;object-fit:cover;border-radius:20px}
.pic.xl{width:min(220px,55vw);height:min(220px,55vw);font-size:7rem}
.pic.sm{width:56px;height:56px;font-size:1.9rem;border-width:2px;box-shadow:0 0 10px rgba(88,150,255,.5);margin:0;border-radius:14px}
.pic.xs{width:44px;height:44px;font-size:1.5rem;border-width:1px;box-shadow:none;margin:0;border-radius:12px}

/* ===== bảng từ ===== */
.words{width:100%;border-collapse:collapse}
.words th,.words td{text-align:left;padding:8px;border-bottom:1px solid var(--line);vertical-align:middle}
.words th{color:var(--cyan)}
@media(max-width:640px){.words th:nth-child(4),.words td:nth-child(4){display:none}}

/* ===== khung game ===== */
.game-top{display:flex;align-items:center;gap:14px;margin:8px 0}
.game-top h1{margin:0;font-size:clamp(1.3rem,2.4vw,1.9rem)}
.hud{display:flex;align-items:center;gap:12px;margin:8px 0 12px;font-weight:600}
.bar{flex:1;height:12px;background:rgba(255,255,255,.1);border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--grad);border-radius:99px;transition:width .4s;box-shadow:0 0 12px rgba(255,63,208,.7)}
.bar.big{height:18px;margin:6px 0}
.pts{min-width:3.2em;text-align:right;color:var(--cyan)}.pts.pop{animation:pop .4s}
@keyframes pop{50%{transform:scale(1.4)}}
.q-card{display:flex;flex-direction:column;gap:12px}
.q-text{font-size:1.15rem;font-weight:700;text-align:center;margin:0}
.sentence{font-size:clamp(1.3rem,3vw,2rem);text-align:center;margin:.3em 0}
.blank{display:inline-block;min-width:3.5em;border-bottom:4px solid var(--pink);color:var(--pink);font-weight:700}
.big-speak{align-self:center;font-size:3.4rem;width:120px;height:120px;border-radius:50%;border:3px solid var(--cyan);background:radial-gradient(circle at 35% 30%,#5b8cff,#6a2dd8 70%);cursor:pointer;box-shadow:0 0 30px rgba(88,150,255,.7)}
.big-speak:active{transform:scale(.94)}
.opts{display:grid;gap:12px;grid-template-columns:1fr 1fr}
@media(max-width:420px){.opts{grid-template-columns:1fr}}
.opt{font:inherit;color:var(--ink);font-size:1.25rem;font-weight:700;padding:.9em .6em;border:2px solid var(--line);background:rgba(255,255,255,.05);border-radius:16px;cursor:pointer;min-height:64px;transition:border-color .15s,box-shadow .15s}
.opt:hover:not(:disabled){border-color:var(--cyan);box-shadow:var(--glow)}
.opt.ok,.letter.ok,.answer-zone.ok{background:rgba(62,230,160,.16);border-color:var(--green);box-shadow:0 0 16px rgba(62,230,160,.45)}
.opt.bad,.letter.bad,.answer-zone.bad{background:rgba(255,92,122,.16);border-color:var(--bad);box-shadow:0 0 16px rgba(255,92,122,.4)}
.feedback{min-height:1.6em;text-align:center;font-weight:700}.feedback.ok{color:var(--green)}.feedback.bad{color:var(--bad)}
.vi-line{margin:0;font-size:1.2rem}
.hint{display:flex;align-items:center;gap:12px;justify-content:center;background:rgba(255,255,255,.06);border:1px solid var(--line);border-radius:14px;padding:8px}

/* nối từ */
.match{display:grid;grid-template-columns:1fr 1.3fr;gap:18px;margin-top:8px}
.match .col{display:flex;flex-direction:column;gap:10px}
.chip-w{font:inherit;color:#fff;font-size:1.15rem;font-weight:700;padding:.7em .8em;border:2px solid var(--cyan);background:linear-gradient(135deg,#2f5fe0,#7a35e0);border-radius:14px;cursor:grab;touch-action:none;user-select:none;min-height:56px;position:relative;box-shadow:var(--glow)}
.chip-w.grab{cursor:grabbing;box-shadow:0 10px 28px rgba(255,63,208,.6)}
.chip-w.sel{outline:4px solid var(--yellow);outline-offset:2px}
.chip-w.gone{opacity:.25;cursor:default;box-shadow:none}
.slot{font:inherit;color:var(--ink);display:flex;align-items:center;gap:10px;padding:.6em .9em;border:2px dashed rgba(140,150,255,.6);background:rgba(255,255,255,.04);border-radius:14px;cursor:pointer;min-height:56px;text-align:left}
.slot.hot{border-color:var(--cyan);background:rgba(88,228,255,.15);box-shadow:var(--glow)}
.slot.done{border:2px solid var(--green);background:rgba(62,230,160,.14)}
.slot-ico{font-size:1.5rem}.slot-vi{flex:1;font-weight:600}.slot-fill{font-weight:800;color:var(--green)}
.shake{animation:shake .4s}
@keyframes shake{25%{transform:translateX(-7px)}75%{transform:translateX(7px)}}

/* sắp xếp câu */
.answer-zone{min-height:68px;border:2px dashed rgba(140,150,255,.6);border-radius:16px;padding:10px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;background:rgba(255,255,255,.04)}
.tokens{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;min-height:56px}
.tok{font:inherit;color:#fff;font-size:1.15rem;font-weight:700;padding:.5em .9em;border:2px solid var(--cyan);background:linear-gradient(135deg,#2f5fe0,#7a35e0);border-radius:12px;cursor:pointer;min-height:48px}
.tok:hover{box-shadow:var(--glow)}

/* điền chữ cái */
.letters{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:6px 0}
.letter{width:2.6rem;height:3.2rem;font:inherit;color:var(--ink);font-size:1.6rem;font-weight:800;text-align:center;border:2px solid var(--cyan);border-radius:12px;background:rgba(255,255,255,.07);text-transform:lowercase;padding:0}
.letter.fixed{display:grid;place-items:center;background:rgba(139,92,246,.35);border-color:var(--violet)}
input.letter:focus{outline:4px solid var(--yellow);background:rgba(255,210,63,.15)}

/* kết quả */
.result .mascot-box{margin-bottom:6px}.big{font-size:1.2rem}

/* ===== flashcard ===== */
.fc-wrap{display:flex;flex-direction:column;align-items:center;gap:16px}
.fc{width:min(520px,100%);height:clamp(300px,52vh,420px);perspective:1200px;cursor:pointer;position:relative}
.fc-face{position:absolute;inset:0;border:2px solid var(--cyan);border-radius:26px;box-shadow:0 0 34px rgba(88,150,255,.5);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:18px;backface-visibility:hidden;transition:transform .55s;background:linear-gradient(160deg,#1b1458,#0b0830);text-align:center}
.fc-face.back{transform:rotateY(180deg);background:linear-gradient(160deg,#143a5e,#2a0f55);border-color:var(--pink);box-shadow:0 0 34px rgba(255,63,208,.5)}
.fc.flip .front{transform:rotateY(-180deg)}.fc.flip .back{transform:rotateY(0)}
.fc-word{font-size:clamp(2rem,6vw,3.2rem);font-weight:800;text-shadow:0 0 18px rgba(88,150,255,.8)}
.fc-vi{font-size:clamp(2rem,6vw,3rem);font-weight:800;color:var(--cyan);text-shadow:0 0 18px rgba(88,228,255,.6)}
.fc-ex{font-size:1.2rem;font-style:italic;margin:0}
.fc-controls{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}

/* ===== hồ sơ ===== */
.profile-head{display:flex;flex-wrap:wrap;gap:16px;align-items:center}
.avatar{font-size:3.4rem;background:rgba(139,92,246,.3);border:1px solid var(--line);border-radius:50%;width:90px;height:90px;display:grid;place-items:center;box-shadow:var(--glow)}
.profile-head h1{margin:0}.profile-head>.grow{min-width:220px}
.stats{grid-template-columns:repeat(auto-fill,minmax(min(100%,150px),1fr))}
.stat{text-align:center;display:flex;flex-direction:column;padding:12px}.stat b{font-size:1.5rem;color:var(--cyan)}.stat span{color:var(--muted);font-size:.85rem}
.badges{grid-template-columns:repeat(auto-fill,minmax(min(100%,170px),1fr))}
.badge{text-align:center;display:flex;flex-direction:column;gap:2px;opacity:.5;filter:grayscale(.9)}
.badge.got{opacity:1;filter:none;border-color:var(--pink);box-shadow:0 0 20px rgba(255,63,208,.35)}
.b-ico{font-size:2.4rem}
.note-card{margin-top:16px;font-size:.92rem}

/* ===== footer + toast ===== */
.foot{border-top:1px solid var(--line);background:rgba(5,3,26,.85);padding:20px 0 28px;margin-top:30px}
.foot-logo{display:flex;align-items:center;gap:10px}.foot-logo img{width:36px;height:36px;border-radius:50%}
#toasts{position:fixed;top:74px;left:50%;transform:translateX(-50%);z-index:200;display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none;width:min(92vw,520px)}
.toast{background:#1a1650;border:1px solid var(--line);color:#fff;padding:.7em 1.2em;border-radius:14px;box-shadow:var(--shadow),var(--glow);animation:in .25s;transition:opacity .4s,transform .4s;text-align:center}
.toast.good{background:#0e5a45;border-color:var(--green)}.toast.warn{background:#6a4300;border-color:var(--yellow)}.toast.out{opacity:0;transform:translateY(-10px)}
@keyframes in{from{opacity:0;transform:translateY(-10px)}}

@media(max-width:560px){
  .match{grid-template-columns:1fr 1.2fr;gap:10px}
  .fc-controls .btn{flex:1 1 40%}
  .hero{padding:20px 16px}
  .hero-banner{margin-top:10px;border-radius:20px}
  .card{padding:14px}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}