/* Bài thi IQ — dùng biến màu của KLIGHT (style.css) */
.iq-section{background:#fff;min-height:70vh}
.iq-hide{display:none!important}
.iq-center{text-align:center;margin-inline:auto}.iq-center .section-desc{margin-inline:auto}
.iq-en,.iq-en2{color:var(--ink-soft);font-weight:400}
.iq-meta{display:flex;flex-wrap:wrap;gap:6px 22px;color:var(--ink-soft);font-weight:500;margin-top:10px}
.iq-desc{border-top:1px solid var(--line);margin-top:18px;padding-top:16px;color:var(--ink-soft);line-height:1.7}
.iq-desc p{margin:0 0 10px}
.iq-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;max-width:1040px;margin-inline:auto}
.iq-age{display:flex;flex-direction:column;align-items:center;text-align:center;color:#fff;border-radius:28px;padding:34px 26px;transition:transform .25s var(--ease),box-shadow .25s var(--ease)}
.iq-age:not([disabled]):hover{transform:translateY(-5px);box-shadow:var(--shadow-soft)}
.iq-age[disabled]{opacity:.5;cursor:not-allowed}
.iq-c1{background:linear-gradient(135deg,#D39C5C,#C0813B)}.iq-c2{background:linear-gradient(135deg,#78ADA8,#5A9792)}.iq-c3{background:linear-gradient(135deg,#7AA3B6,#548AA3)}
.iq-age small{font-weight:700;letter-spacing:.1em;opacity:.85}
.iq-age h3{font-family:var(--font-display);font-size:2.1rem;margin:6px 0 12px;color:rgb(249, 247, 110)}
.iq-age p{margin:0 0 8px;line-height:1.55;font-size:.95rem;color:#fff;opacity:.95}.iq-age .iq-en2{opacity:.8;font-size:.88rem}
.iq-go{margin-top:auto;padding:12px 26px;border-radius:99px;background:rgba(255,255,255,.25);font-weight:700}
.iq-age p:last-of-type{margin-bottom:20px}
.iq-feat{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 34px;margin-top:30px;color:var(--ink-soft);font-weight:500;font-size:.95rem}
.iq-back{color:var(--ink-soft);font-weight:600;font-size:.92rem;padding:0 0 14px}.iq-back:hover{color:var(--red)}
.iq-intro{max-width:720px;margin-inline:auto}
.iq-h1{font-family:var(--font-display);font-weight:700;color:var(--navy);font-size:clamp(1.5rem,3.4vw,2.4rem);line-height:1.2;margin:0}
.iq-sub{font-size:1.1rem;margin-top:4px}
.iq-lang{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:24px 0 6px}
.iq-lang button{border:2px solid var(--line);background:#fff;color:var(--ink);border-radius:var(--radius-sm);padding:16px;font-size:1.05rem;font-weight:700}
.iq-lang button.on{border-color:var(--navy);background:var(--navy);color:#fff}
.iq-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:36px;align-items:start}

#iq-qs{margin-top:22px;border-top:1px solid var(--line);padding-top:22px}
.iq-q{margin-bottom:30px;scroll-margin-top:calc(var(--header-h) + 16px)}.iq-q b{display:block;color:var(--navy)}
.iq-qp{color:var(--ink-soft);margin-bottom:10px;font-size:.95rem}
.iq-qrow{display:flex;flex-direction:column;align-items:flex-start;gap:16px}
.iq-g{display:grid;grid-template-columns:1fr 1fr;gap:5px;width:170px;background:#EEF1F3;padding:5px;border-radius:12px;box-shadow:0 2px 6px rgba(0,0,0,.08)}
.iq-g>div{aspect-ratio:1;background:#fff;border:1px solid #D5DADF;border-radius:8px;display:flex}
.iq-g svg{width:100%;height:100%}
.iq-g .iq-qm{background:#FCFAEA;border:2px dashed #F0A23E;align-items:center;justify-content:center;font:700 2rem var(--font-display);color:#8A9A9A}
.iq-opts{display:flex;flex-wrap:wrap;gap:12px}
.iq-opt{position:relative;width:104px;height:104px;background:#fff;border:2.5px solid var(--line);border-radius:18px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:.15s}
.iq-opt:hover{border-color:var(--navy-soft)}
.iq-opt input{position:absolute;inset:0;width:100%;height:100%;opacity:0;margin:0;cursor:pointer}
.iq-opt svg{width:66%;pointer-events:none}
.iq-opt b{position:absolute;left:7px;top:6px;background:var(--cream);color:var(--ink-soft);border-radius:6px;padding:0 8px;font-size:.78rem}
.iq-opt.on{border-color:var(--navy);background:rgba(11,27,77,.06)}.iq-opt.on b{background:var(--navy);color:#fff}
.iq-opt.ok{border-color:#1D8A4A;background:#E8F6EC}.iq-opt.no{border-color:var(--red);background:#FDECEC}
.iq-panel{position:sticky;top:calc(var(--header-h) + 16px);border-radius:var(--radius-sm);box-shadow:var(--shadow-soft);overflow:hidden;background:#fff}
.iq-ph{background:var(--navy);color:#fff;text-align:center;padding:16px;font-size:1.1rem;font-weight:700}
.iq-pb{padding:20px}
.iq-timer{text-align:center;font-family:var(--font-mono);font-weight:700;font-size:1.7rem;color:var(--navy);margin-bottom:14px}
.iq-tg{display:flex;justify-content:space-between;align-items:center;gap:8px;font-weight:700;font-size:.85rem}
.iq-sw{position:relative;width:52px;height:30px;flex:none}
.iq-sw input{opacity:0;position:absolute;inset:0;margin:0;cursor:pointer;z-index:1}
.iq-sw i{position:absolute;inset:0;background:var(--line);border-radius:99px;transition:.2s}
.iq-sw i:after{content:"";position:absolute;left:3px;top:3px;width:24px;height:24px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.25);transition:.2s}
.iq-sw input:checked+i{background:var(--navy)}.iq-sw input:checked+i:after{left:25px}
.iq-pal{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:18px 0}
.iq-pal button{aspect-ratio:1;border:1.5px solid var(--line);background:#fff;color:var(--ink-soft);border-radius:8px;font-weight:700}
.iq-pal button.done{background:var(--navy);color:#fff;border-color:var(--navy)}
.iq-pal button.ok{background:#1D8A4A;color:#fff;border-color:#1D8A4A}.iq-pal button.no{background:var(--red);color:#fff;border-color:var(--red)}
.iq-pg{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;margin-bottom:16px}
.iq-pg button{background:var(--cream);color:var(--ink-soft);padding:9px 13px;border-radius:8px;font-weight:600}
.iq-pg button:last-child:not(:disabled){background:var(--navy);color:#fff}.iq-pg button:disabled{opacity:.5;cursor:default}
.iq-box{max-width:500px;margin:10px auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);padding:28px;box-shadow:var(--shadow-soft)}
.iq-c{text-align:center}.iq-note{color:var(--ink-soft);font-size:.9rem}
.iq-box label{display:block;font-weight:600;font-size:.88rem;margin:14px 0 5px;color:var(--navy)}
.iq-box input[type=text],.iq-box input[type=tel],.iq-box input[type=email]{width:100%;padding:13px 16px;border-radius:12px;border:1.5px solid var(--line);font:inherit;font-size:.95rem;color:var(--ink)}
.iq-box input:focus{border-color:var(--red);outline:none}
.iq-err{color:var(--red);font-size:.85rem;min-height:1.2em;margin:8px 0}
.iq-age small{font-size:1.1rem;color:#fff;opacity:1}
.iq-age p{font-size:1.1rem;color:#fff;opacity:1}
.iq-age .iq-en2{font-size:1.1rem;color:#fff;opacity:1}
.iq-go{font-size:1.1rem;color:#fff}
.iq-age,.iq-age small,.iq-age p,.iq-age .iq-en2,.iq-go{font-family:'Be Vietnam Pro',system-ui,sans-serif}
.iq-age h3{font-family:'Be Vietnam Pro',system-ui,sans-serif;font-weight:800;letter-spacing:-.02em}
/* Form nhận kết quả — đoạn giới thiệu */
#iq-form .iq-box{max-width:640px;padding:36px}
#iq-fS{text-align:left;font-size:1.08rem;line-height:1.75;color:var(--ink);margin:16px 0 10px}
.iq-f1{display:block;text-align:center;font-family:var(--font-display);font-size:1.3rem;font-weight:700;line-height:1.4;color:var(--navy);margin-bottom:18px}
.iq-f2{display:block;color:var(--ink-soft);margin-bottom:18px}
.iq-f3{display:block;background:#FFF6E5;border-left:4px solid #F0A23E;border-radius:12px;padding:14px 18px;font-weight:600;color:var(--navy)}
@media(max-width:599px){
  #iq-form .iq-box{padding:22px 18px}
  #iq-fS{font-size:1rem}
  .iq-f1{font-size:1.15rem}
}

/* Báo lỗi từng ô */
.iq-box input.iq-bad{border-color:var(--red);background:#FFF5F5}
.iq-err{font-weight:600;margin:6px 0 0}

/* Màn hình gửi thành công */
#iq-thanks .iq-box{max-width:560px;padding:36px}
#iq-tmsg{font-size:1.05rem;line-height:1.7;color:var(--ink)}
.iq-t1{display:block;font-weight:600;color:var(--navy);margin-bottom:20px}
.iq-t2{display:block;color:var(--ink-soft);margin-bottom:12px}
#iq-tsoc{display:block;margin-bottom:20px}
#iq-tsoc .social-row{justify-content:center;gap:16px}
#iq-tsoc .social-icon{width:52px;height:52px;box-shadow:0 4px 12px rgba(0,0,0,.15)}
#iq-tsoc .social-icon svg{width:24px;height:24px}
#iq-tsoc .social-text{font-size:1rem}
.iq-t3{display:block;background:#FFF6E5;border-left:4px solid #F0A23E;border-radius:12px;padding:12px 16px;font-weight:600;color:var(--navy);text-align:left}
@media(max-width:599px){#iq-thanks .iq-box{padding:24px 18px}}

/* ==========================================================================
   RESPONSIVE — đồng bộ breakpoint với style.css (1280 · 1024 · 860 · 767 · 599 · 430 · 359 · landscape)
   ========================================================================== */

/* ---- ≥1280px: laptop/màn hình lớn — giới hạn độ rộng bảng điều hướng cho cân đối ---- */
@media(min-width:1280px){
  .iq-layout{grid-template-columns:minmax(0,1fr) 360px}
  .iq-opt{width:112px;height:112px}
}

/* ---- ≤1024px: iPad landscape, laptop nhỏ — thu hẹp cột panel bên phải ---- */
@media(max-width:1024px){
  .iq-layout{grid-template-columns:minmax(0,1fr) 300px;gap:26px}
  .iq-cards{gap:16px}
}

/* ---- ≤860px: ranh giới chuyển menu mobile — bài thi chuyển 1 cột, panel lên trên ---- */
@media(max-width:860px){
  .iq-layout{grid-template-columns:minmax(0,1fr)}
  .iq-panel{position:static!important;order:-1}
}

/* ---- ≤767px: iPad portrait nhỏ, tablet Android — thẻ chọn tuổi, lưới hình ảnh co lại ---- */
@media(max-width:767px){
  .iq-cards{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
  .iq-age{padding:28px 20px}
  .iq-g{width:150px}
  .iq-opt{width:92px;height:92px}
  .iq-box{padding:22px}
}

/* ---- ≤599px: phần lớn điện thoại hiện đại (iPhone 12-16, Galaxy S) ---- */
@media(max-width:599px){
  .iq-cards{grid-template-columns:1fr;max-width:420px}
  .iq-lang{grid-template-columns:1fr;gap:10px}
  .iq-feat{gap:8px 18px;font-size:.88rem}
  .iq-qrow{gap:12px}
  .iq-g{width:130px}
  .iq-g .iq-qm{font-size:1.5rem}
  .iq-opts{gap:10px}
  .iq-opt{width:80px;height:80px;border-radius:14px}
  .iq-opt b{font-size:.7rem;padding:0 6px}
  .iq-pal{grid-template-columns:repeat(5,1fr);gap:7px}
  .iq-pal button{font-size:.85rem}
  .iq-timer{font-size:1.4rem}
  .iq-pg{font-size:.8rem}
  .iq-box{padding:18px;margin-inline:4px}
  .iq-h1{font-size:1.3rem}
}

/* ---- ≤430px: iPhone Pro Max, Galaxy Note/Ultra — vẫn 1 cột nhưng khít hơn ---- */
@media(max-width:430px){
  .iq-g{width:118px}
  .iq-opt{width:72px;height:72px;border-radius:12px}
  .iq-pal{gap:6px}
  .iq-pal button{padding:0}
  .iq-pb{padding:16px}
}

/* ---- ≤359px: điện thoại màn hình nhỏ/cũ (iPhone SE 1, Galaxy cũ) ---- */
@media(max-width:359px){
  .iq-g{width:104px}
  .iq-g .iq-qm{font-size:1.2rem}
  .iq-opt{width:62px;height:62px}
  .iq-opt b{font-size:.62rem;padding:0 4px}
  .iq-pal{grid-template-columns:repeat(4,1fr)}
  .iq-age h3{font-size:1.7rem}
  .iq-box{padding:14px;margin-inline:0}
}

/* ---- Điện thoại xoay ngang (chiều cao thấp) — giảm padding dọc để vừa màn hình ---- */
@media(max-height:500px) and (orientation:landscape) and (max-width:1024px){
  .iq-section{min-height:auto}
  .iq-box{padding:16px;margin-block:6px}
  .iq-pb{padding:14px}
  .iq-timer{font-size:1.3rem;margin-bottom:8px}
  .iq-pal{margin:10px 0}
  .iq-age{padding:20px 18px}
}

/* ==========================================================================
   MOBILE / TABLET — bản hoàn thiện (đặt CUỐI file để không bị rule gốc ghi đè)
   ========================================================================== */
.iq-layout>*,.iq-q,.iq-qrow,.iq-st{min-width:0;max-width:100%}
.iq-section{overflow-x:clip}
.iq-h1{overflow-wrap:anywhere}

/* Đồng hồ nổi (chỉ hiện trên điện thoại/tablet khi đang làm bài) */
.iq-float{position:fixed;z-index:40;right:12px;top:calc(var(--header-h) + 10px);background:var(--navy);color:#fff;font:700 .95rem var(--font-mono);padding:8px 14px;border-radius:99px;box-shadow:var(--shadow-soft);letter-spacing:.02em}
@media(min-width:861px){.iq-float{display:none!important}}

@media(max-width:860px){
  .iq-layout{grid-template-columns:minmax(0,1fr);gap:20px}
  .iq-panel{margin-bottom:4px}
  .iq-ph{padding:12px;font-size:1rem}
  .iq-pb{padding:16px}
  .iq-pal{grid-template-columns:repeat(8,1fr);gap:8px;margin:14px 0}
  .iq-q{margin-bottom:34px;padding-bottom:26px;border-bottom:1px dashed var(--line)}
  .iq-q:last-child{border-bottom:0}
}
@media(max-width:599px){
  .iq-section{padding-block:28px}
  .iq-pal{grid-template-columns:repeat(6,1fr);gap:7px}
  .iq-pal button{font-size:.82rem;border-radius:8px}
  .iq-meta{gap:4px 14px;font-size:.9rem}
  .iq-qp div{font-size:1rem!important;line-height:1.45}
  /* Đáp án: lưới đều, tự co theo bề rộng màn hình, không bao giờ tràn */
  .iq-opts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;width:100%}
  .iq-opts[data-n="5"]{grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}
  .iq-opts[data-n="3"]{grid-template-columns:repeat(3,minmax(0,1fr))}
  .iq-opt{width:100%;height:auto;aspect-ratio:1;border-radius:14px}
  .iq-opt svg{width:72%}
  .iq-opt b{left:5px;top:4px;padding:0 6px;font-size:.68rem}
  .iq-st{width:100%}
}
@media(max-width:359px){
  .iq-opts[data-n="5"]{gap:6px}
  .iq-pal{grid-template-columns:repeat(5,1fr)}
}