:root{--acc:#c9246a;--acc-50:#fdf0f5;--acc-100:#f6d3e2;--lav:#f3eeff;--lav-ink:#5a43c4;
  --c1:#e5397f;--c1b:#fde4ee;--c2:#7b5be6;--c2b:#efe9ff;--c3:#1f8a5e;--c3b:#e3f6ec;--c4:#d9822b;--c4b:#fff0de;--c5:#2f7fc1;--c5b:#e5f1fb}
html,body{overflow-x:hidden;background:#fff}
.vhl-app{padding-top:12px;max-width:820px}
.vhl-btn-primary{background:var(--acc)}.vhl-btn-primary:hover{background:#b01f5c}
.vhl-btn-ghost{color:var(--acc);border-color:var(--acc-100)}.vhl-btn-ghost:hover{background:var(--acc-50)}
button{-webkit-tap-highlight-color:transparent;font:inherit}
:focus-visible{outline:2px solid var(--acc);outline-offset:2px}
h2,h3{font-family:var(--font-head)}
p{line-height:1.65}

/* Đầu bài */
.pl-head{display:flex;align-items:center;gap:16px;background:linear-gradient(135deg,#fff3f8,#f4efff);border-radius:22px;padding:18px 20px}
.pl-ring{flex:none;width:68px;height:68px;position:relative}
.pl-ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.pl-ring b{position:absolute;inset:0;display:grid;place-items:center;font-size:.95rem;color:var(--acc);font-variant-numeric:tabular-nums}
.pl-head h1{font-family:var(--font-head);font-size:1.25rem;line-height:1.3;margin:0}
.pl-head p{margin:4px 0 0;font-size:.88rem;color:var(--ink-3)}
.pl-meta{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.pl-meta span{font-size:.76rem;font-weight:600;background:#fff;border-radius:999px;padding:3px 10px;color:var(--ink-2)}

/* Thanh chặng */
.pl-steps{display:flex;gap:8px;overflow-x:auto;padding:14px 2px 6px;scrollbar-width:none;scroll-snap-type:x proximity}
.pl-steps::-webkit-scrollbar{display:none}
.pl-steps button{flex:none;scroll-snap-align:start;display:flex;align-items:center;gap:7px;border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:6px 13px 6px 6px;font-size:.84rem;font-weight:600;color:var(--ink-2);cursor:pointer;white-space:nowrap;transition:.15s}
.pl-steps i{font-style:normal;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;background:var(--bg-soft);font-size:.78rem;color:var(--ink-3)}
.pl-steps button.done i{background:#e3f6ec;color:var(--ok)}
.pl-steps button[aria-current="step"]{border-color:var(--acc);color:var(--acc);background:var(--acc-50)}
.pl-steps button[aria-current="step"] i{background:var(--acc);color:#fff}

/* Khung nội dung */
.pl-card{margin-top:10px;background:#fff;border:1px solid var(--line);border-radius:22px;padding:24px 22px;box-shadow:var(--shadow);animation:pl-in .35s ease}
@keyframes pl-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.pl-kick{font-size:.76rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--acc);margin:0}
.pl-card h2{font-size:1.45rem;line-height:1.3;margin:6px 0 10px}
.pl-lead{color:var(--ink-2);margin:0 0 14px}
.pl-key{display:flex;gap:12px;align-items:flex-start;background:linear-gradient(135deg,#fff5f9,#f6f2ff);border-radius:16px;padding:14px 16px;margin:16px 0 4px}
.pl-key svg{flex:none;width:26px;height:26px;color:var(--acc);margin-top:2px}
.pl-key p{margin:0;font-weight:500;color:var(--ink)}
.pl-nav{display:flex;justify-content:space-between;gap:10px;margin-top:22px;padding-top:16px;border-top:1px solid var(--line)}
.pl-nav .vhl-btn{padding:11px 20px;gap:0}
.pl-small{font-size:.82rem;color:var(--ink-3)}

/* Chặng 1: so sánh */
.pl-toggle{display:inline-flex;background:var(--bg-soft);border-radius:999px;padding:4px;gap:4px;margin:4px 0 12px}
.pl-toggle button{border:0;background:none;border-radius:999px;padding:8px 14px;font-weight:600;font-size:.88rem;color:var(--ink-3);cursor:pointer}
.pl-toggle button[aria-pressed="true"]{background:#fff;color:var(--ink);box-shadow:0 2px 8px #1d1b2214}
.pl-chat{display:grid;gap:10px}
.pl-msg{border-radius:16px;padding:12px 14px;font-size:.92rem;line-height:1.6;max-width:92%}
.pl-msg small{display:block;font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;margin-bottom:4px;opacity:.7}
.pl-msg.me{justify-self:end;background:var(--acc-50);color:var(--ink)}
.pl-msg.ai{background:var(--bg-soft);color:var(--ink-2)}
.pl-msg.ai.good{background:#effaf4}
.pl-verdict{display:inline-flex;align-items:center;gap:6px;font-size:.8rem;font-weight:700;border-radius:999px;padding:4px 11px;margin-top:2px}
.pl-verdict.bad{background:#fdecef;color:var(--bad)}.pl-verdict.ok{background:#e3f6ec;color:var(--ok)}

/* Chặng 2: công thức */
.pl-pieces{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;margin:6px 0 14px}
.pl-piece{border:0;border-radius:16px;padding:12px 8px;text-align:center;cursor:pointer;transition:transform .15s,box-shadow .15s}
.pl-piece b{display:block;font-size:.92rem}
.pl-piece span{display:block;font-size:.72rem;opacity:.8;margin-top:2px}
.pl-piece em{font-style:normal;display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:#fff;margin:0 auto 6px;font-weight:700;font-size:.85rem}
.pl-piece:hover{transform:translateY(-2px)}
.pl-piece[aria-pressed="true"]{box-shadow:0 0 0 2px currentColor inset}
.k1{background:var(--c1b);color:var(--c1)}.k2{background:var(--c2b);color:var(--c2)}.k3{background:var(--c3b);color:var(--c3)}.k4{background:var(--c4b);color:var(--c4)}.k5{background:var(--c5b);color:var(--c5)}
.pl-explain{border-radius:16px;padding:14px 16px;margin-bottom:14px;min-height:92px}
.pl-explain h3{font-size:1.02rem;margin:0 0 4px}
.pl-explain p{margin:0;font-size:.92rem;color:var(--ink-2)}
.pl-explain .q{display:block;margin-top:6px;font-size:.86rem;color:var(--ink-3)}
.pl-sample{border:1.5px dashed var(--line);border-radius:16px;padding:14px 16px;font-size:.94rem;line-height:1.8}
.pl-sample mark{background:none;color:inherit;border-radius:6px;padding:1px 3px;transition:.2s}
.pl-sample.focus mark{opacity:.35}
.pl-sample mark.on{opacity:1!important}
.pl-sample mark.k1{background:var(--c1b)}.pl-sample mark.k2{background:var(--c2b)}.pl-sample mark.k3{background:var(--c3b)}.pl-sample mark.k4{background:var(--c4b)}.pl-sample mark.k5{background:var(--c5b)}
.pl-mn{text-align:center;font-weight:700;margin:14px 0 0;font-size:.95rem;color:var(--ink-2)}
.pl-mn span{display:inline-block;margin:0 2px}

/* Chặng 3: tự viết */
.pl-scen{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 14px}
.pl-scen button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 12px;font-size:.84rem;font-weight:600;color:var(--ink-2);cursor:pointer}
.pl-scen button:hover{border-color:var(--acc);color:var(--acc)}
.pl-form{display:grid;gap:10px}
.pl-f{display:grid;grid-template-columns:34px 1fr;gap:10px;align-items:start}
.pl-f em{font-style:normal;width:34px;height:34px;border-radius:12px;display:grid;place-items:center;font-weight:700;margin-top:24px}
.pl-f label{font-size:.85rem;font-weight:600;color:var(--ink-2);display:block;margin-bottom:4px}
.pl-f textarea{width:100%;box-sizing:border-box;border:1.5px solid var(--line);border-radius:14px;padding:10px 12px;font:inherit;font-size:.92rem;line-height:1.5;resize:vertical;min-height:46px;transition:border-color .15s}
.pl-f textarea:focus{outline:0;border-color:var(--acc);box-shadow:0 0 0 4px var(--acc-50)}
.pl-out{margin-top:16px;border-radius:18px;background:linear-gradient(135deg,#fff7fa,#f7f3ff);padding:16px}
.pl-out-h{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.pl-out-h h3{margin:0;font-size:1.02rem}
.pl-out pre{white-space:pre-wrap;word-break:break-word;font:inherit;font-size:.92rem;line-height:1.65;background:#fff;border-radius:14px;padding:12px 14px;margin:0;min-height:60px;color:var(--ink)}
.pl-meter{display:flex;align-items:center;gap:10px;margin:12px 0 8px}
.pl-meter-bar{flex:1;height:10px;border-radius:999px;background:#fff;overflow:hidden}
.pl-meter-bar i{display:block;height:100%;width:0;border-radius:999px;background:linear-gradient(90deg,#f59ab9,#c9246a);transition:width .4s}
.pl-meter b{font-size:.9rem;min-width:110px;text-align:right}
.pl-checks{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:4px 14px}
.pl-checks li{font-size:.84rem;color:var(--ink-3);display:flex;gap:6px;align-items:flex-start}
.pl-checks li::before{content:"○";color:#c9c3cf;font-weight:700}
.pl-checks li.ok{color:var(--ink-2)}.pl-checks li.ok::before{content:"✓";color:var(--ok)}

/* Chặng 4: mẹo */
.pl-tips{display:grid;gap:10px}
.pl-tip{border:1px solid var(--line);border-radius:18px;overflow:hidden;background:#fff}
.pl-tip>button{width:100%;display:flex;align-items:center;gap:12px;border:0;background:none;padding:14px 16px;text-align:left;cursor:pointer}
.pl-tip>button i{font-style:normal;flex:none;width:36px;height:36px;border-radius:12px;display:grid;place-items:center;font-size:1.1rem}
.pl-tip>button b{flex:1;font-size:.98rem;color:var(--ink)}
.pl-tip>button span{font-size:.8rem;color:var(--ink-3);font-weight:400;display:block;margin-top:1px}
.pl-tip>button svg{flex:none;width:18px;height:18px;color:var(--ink-3);transition:transform .2s}
.pl-tip.open>button svg{transform:rotate(180deg)}
.pl-tip-b{display:none;padding:0 16px 16px}
.pl-tip.open .pl-tip-b{display:block}
.pl-ba{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.pl-ba div{border-radius:14px;padding:10px 12px;font-size:.88rem;line-height:1.55}
.pl-ba small{display:block;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;margin-bottom:3px}
.pl-ba .b{background:#fdf1f3;color:var(--ink-2)}.pl-ba .b small{color:var(--bad)}
.pl-ba .a{background:#eefaf4;color:var(--ink)}.pl-ba .a small{color:var(--ok)}
.pl-tip-b p{margin:0 0 10px;font-size:.92rem;color:var(--ink-2)}

/* Chặng 5: A/B */
.pl-ab-top{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:10px}
.pl-dots{display:flex;gap:5px}
.pl-dots i{width:9px;height:9px;border-radius:50%;background:var(--line)}
.pl-dots i.ok{background:var(--ok)}.pl-dots i.no{background:var(--bad)}.pl-dots i.cur{background:var(--acc)}
.pl-task{background:var(--lav);color:var(--lav-ink);border-radius:14px;padding:10px 14px;font-weight:600;font-size:.92rem;margin-bottom:12px}
.pl-opts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.pl-opt{border:2px solid var(--line);background:#fff;border-radius:18px;padding:14px;text-align:left;cursor:pointer;font-size:.9rem;line-height:1.55;color:var(--ink-2);transition:.15s;position:relative}
.pl-opt b{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--bg-soft);color:var(--ink);margin-bottom:6px;font-size:.85rem}
.pl-opt:hover:not([disabled]){border-color:var(--acc-100);transform:translateY(-2px)}
.pl-opt.right{border-color:var(--ok);background:#f2fbf6}.pl-opt.right b{background:var(--ok);color:#fff}
.pl-opt.wrong{border-color:var(--bad);background:#fdf3f5}.pl-opt.wrong b{background:var(--bad);color:#fff}
.pl-opt[disabled]{cursor:default}
.pl-why{margin-top:12px;border-radius:14px;padding:12px 14px;font-size:.9rem;background:var(--bg-soft);color:var(--ink-2);display:none}
.pl-why.show{display:block;animation:pl-in .3s}
.pl-why strong{color:var(--ink)}
.pl-done{text-align:center;padding:10px 0}
.pl-done .big{font-family:var(--font-head);font-size:2.6rem;color:var(--acc);margin:4px 0}

/* Chặng 6: an toàn */
.pl-sort{display:grid;gap:8px}
.pl-si{display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:16px;padding:10px 12px;background:#fff}
.pl-si p{flex:1;margin:0;font-size:.9rem;line-height:1.45}
.pl-si .bt{display:flex;gap:6px;flex:none}
.pl-si .bt button{border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:6px 11px;font-size:.8rem;font-weight:600;cursor:pointer;color:var(--ink-2)}
.pl-si.ok{border-color:#bfe6d2;background:#f4fbf7}.pl-si.no{border-color:#f3c6cf;background:#fdf5f7}
.pl-si small{display:block;font-size:.8rem;color:var(--ink-3);margin-top:4px}
.pl-rules{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}
.pl-rule{border-radius:16px;padding:12px 14px;background:var(--bg-soft)}
.pl-rule b{display:block;font-size:.92rem;margin-bottom:2px}
.pl-rule span{font-size:.85rem;color:var(--ink-2);line-height:1.5}

/* Chặng 7: mẫu */
.pl-lib-tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.pl-lib-tabs button{border:0;background:var(--bg-soft);border-radius:999px;padding:7px 13px;font-size:.84rem;font-weight:600;color:var(--ink-2);cursor:pointer}
.pl-lib-tabs button[aria-pressed="true"]{background:#1d1b22;color:#fff}
.pl-lib{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.pl-tpl{border:1px solid var(--line);border-radius:18px;padding:14px;display:flex;flex-direction:column;gap:8px;background:#fff}
.pl-tpl h3{font-family:var(--font-body);font-size:.95rem;margin:0}
.pl-tpl p{margin:0;font-size:.86rem;line-height:1.6;color:var(--ink-2);flex:1}
.pl-tpl p u{text-decoration:none;background:var(--c4b);color:#9a5513;border-radius:5px;padding:0 3px}
.pl-copy{align-self:flex-start;border:1.5px solid var(--acc-100);background:#fff;color:var(--acc);border-radius:999px;padding:6px 13px;font-size:.82rem;font-weight:600;cursor:pointer}
.pl-copy:hover{background:var(--acc-50)}

/* Chặng 8: flashcard + quiz */
.pl-fc{perspective:1000px;margin:6px auto 10px;max-width:440px}
.pl-fc-in{position:relative;height:200px;transition:transform .55s cubic-bezier(.3,.7,.2,1);transform-style:preserve-3d;cursor:pointer}
.pl-fc.flip .pl-fc-in{transform:rotateY(180deg)}
.pl-fc-f,.pl-fc-b{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:22px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:20px}
.pl-fc-f{background:linear-gradient(135deg,#fde4ee,#efe9ff)}
.pl-fc-f b{font-family:var(--font-head);font-size:1.5rem;color:var(--ink)}
.pl-fc-f span{font-size:.8rem;color:var(--ink-3);margin-top:8px}
.pl-fc-b{background:#fff;border:1.5px solid var(--acc-100);transform:rotateY(180deg);font-size:.95rem;line-height:1.6;color:var(--ink-2)}
.pl-fc-nav{display:flex;justify-content:center;align-items:center;gap:14px}
.pl-fc-nav button{width:42px;height:42px;border-radius:50%;border:1.5px solid var(--line);background:#fff;cursor:pointer;font-size:1.1rem;color:var(--ink-2)}
.pl-fc-nav span{font-size:.88rem;color:var(--ink-3);font-variant-numeric:tabular-nums;min-width:52px;text-align:center}
.pl-sep{border:0;border-top:1px solid var(--line);margin:22px 0 18px}
.pl-q h3{font-family:var(--font-body);font-size:1.02rem;line-height:1.5;margin:6px 0 12px}
.pl-qa{display:grid;gap:8px}
.pl-qa button{border:1.5px solid var(--line);background:#fff;border-radius:14px;padding:11px 14px;text-align:left;cursor:pointer;font-size:.92rem;line-height:1.5;color:var(--ink-2);transition:.15s}
.pl-qa button:hover:not([disabled]){border-color:var(--acc-100);background:#fffafc}
.pl-qa button.right{border-color:var(--ok);background:#f2fbf6;color:var(--ink)}
.pl-qa button.wrong{border-color:var(--bad);background:#fdf3f5}
.pl-qa button[disabled]{cursor:default}
.pl-qbar{height:6px;border-radius:999px;background:var(--bg-soft);overflow:hidden;margin-top:6px}
.pl-qbar i{display:block;height:100%;background:var(--acc);transition:width .3s}
.pl-res{text-align:center}
.pl-res .score{font-family:var(--font-head);font-size:3rem;color:var(--acc);line-height:1;margin:8px 0}
.pl-badge{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#fff3d6,#ffe6ef);border-radius:999px;padding:8px 16px;font-weight:700;color:#9a5513;margin:6px 0 10px}
.pl-review{text-align:left;margin-top:16px;display:grid;gap:8px}
.pl-review div{border-radius:14px;padding:10px 12px;background:#fdf5f7;font-size:.88rem;color:var(--ink-2)}
.pl-review b{color:var(--ink)}
.pl-actions{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:14px}
.pl-next{display:block;margin-top:18px;text-align:center;font-size:.9rem}
.pl-next a{color:var(--acc);font-weight:600}

@media (max-width:640px){
  .pl-nx{display:none}
  .pl-card{padding:20px 16px}
  .pl-card h2{font-size:1.25rem}
  .pl-pieces{grid-template-columns:repeat(5,minmax(0,1fr));gap:5px}
  .pl-piece{padding:10px 2px}.pl-piece span{display:none}.pl-piece b{font-size:.78rem}
  .pl-opts,.pl-ba,.pl-lib,.pl-rules,.pl-checks{grid-template-columns:1fr}
  .pl-si{flex-direction:column;align-items:stretch}.pl-si .bt{justify-content:flex-end}
  .pl-head{padding:14px}.pl-ring{width:56px;height:56px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* Bộ kiểm tra văn bản */
.pl-chk-in{width:100%;box-sizing:border-box;border:1.5px solid var(--line);border-radius:16px;padding:12px 14px;font:inherit;font-size:1rem;line-height:1.55;resize:vertical;min-height:70px}
.pl-chk-in:focus{outline:0;border-color:var(--acc);box-shadow:0 0 0 4px var(--acc-50)}
.pl-hl{margin-top:12px;background:#fff;border-radius:14px;padding:12px 14px;font-size:.95rem;line-height:1.7;min-height:24px;white-space:pre-wrap;word-break:break-word}
.pl-hl mark{background:#ffe0e6;color:#a3132f;border-radius:5px;padding:0 3px}
.pl-len{font-size:.82rem;color:var(--ink-3);text-align:right;margin-top:4px}
.pl-len.over{color:var(--bad);font-weight:600}
.pl-msgs{list-style:none;padding:0;margin:10px 0 0;display:grid;gap:6px}
.pl-msgs li{font-size:.86rem;border-radius:12px;padding:8px 12px;background:#fdf3f5;color:var(--ink-2)}
.pl-msgs li b{color:var(--bad)}
.pl-msgs li.good{background:#f2fbf6}.pl-msgs li.good b{color:var(--ok)}
/* Khối chữ */
.pl-text h3{font-size:1.05rem;margin:18px 0 6px}
.pl-text ul{margin:0 0 10px;padding-left:20px}.pl-text li{margin:4px 0;line-height:1.6;color:var(--ink-2)}
.pl-text p{color:var(--ink-2);margin:0 0 10px}
.pl-src{font-size:.78rem;color:var(--ink-3);margin-top:14px;line-height:1.5}
.pl-src a{color:var(--ink-3)}
.pl-grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:10px 0}
.pl-box{border-radius:16px;padding:12px 14px;background:var(--bg-soft)}
.pl-box b{display:block;margin-bottom:3px;font-size:.93rem}.pl-box span{font-size:.86rem;color:var(--ink-2);line-height:1.5}
.pl-box.k1,.pl-box.k2,.pl-box.k3,.pl-box.k4,.pl-box.k5{color:inherit}
.pl-box.k1 b{color:var(--c1)}.pl-box.k2 b{color:var(--c2)}.pl-box.k3 b{color:var(--c3)}.pl-box.k4 b{color:var(--c4)}.pl-box.k5 b{color:var(--c5)}
.pl-mcq-ctx{background:var(--bg-soft);border-radius:14px;padding:10px 14px;font-size:.9rem;color:var(--ink-2);margin-bottom:10px}
.pl-mcq-ctx b{font-family:var(--font-head);font-size:1.4rem;color:var(--ink);display:block}
@media (max-width:640px){.pl-grid2{grid-template-columns:1fr}}
/* Tinh chỉnh v2: bỏ bớt lớp khung */
.vhl-app{max-width:none;padding:20px 22px 26px}
.pl-card{border:0;box-shadow:none;border-radius:0;padding:20px 4px 4px;margin-top:4px}
@media (max-width:640px){.vhl-app{padding:14px 12px 20px}.pl-card{padding:16px 2px 2px}}
/* v3: chữ lớn hơn, thoáng hơn, có hình minh hoạ */
html{font-size:106.25%}
.vhl-app{padding:24px 28px 34px}
.pl-head{padding:22px 24px;gap:20px}
.pl-head h1{font-size:1.35rem}
.pl-steps{gap:10px;padding:18px 2px 8px}
.pl-steps button{font-size:.9rem;padding:8px 16px 8px 8px}
.pl-card{padding:28px 6px 6px}
.pl-card h2{font-size:1.65rem;margin:8px 0 16px}
.pl-lead,.pl-text p,.pl-text li{font-size:1.04rem;line-height:1.8}
.pl-lead{margin:0 0 22px}
.pl-text h3{font-size:1.15rem;margin:28px 0 10px}
.pl-key{padding:18px 22px;margin:28px 0 8px;border-radius:18px}
.pl-key p{line-height:1.7}
.pl-pieces{gap:12px;margin:10px 0 18px}
.pl-piece{padding:16px 10px}
.pl-explain{padding:18px 22px;margin-bottom:18px}
.pl-explain p{font-size:1rem;line-height:1.75}
.pl-sample{padding:18px 20px;line-height:1.9}
.pl-tips{gap:14px}
.pl-tip>button{padding:16px 20px}
.pl-tip-b{padding:0 20px 20px}
.pl-tip-b p{font-size:1rem;line-height:1.75}
.pl-ba{gap:12px}.pl-ba div{padding:14px 16px;font-size:.95rem;line-height:1.65}
.pl-opts,.pl-lib,.pl-rules,.pl-grid2{gap:14px}
.pl-opt{padding:18px;font-size:.98rem}
.pl-qa{gap:10px}.pl-qa button{padding:14px 18px;font-size:1rem}
.pl-sort{gap:12px}.pl-si{padding:14px 16px}.pl-si p{font-size:.98rem}
.pl-tpl{padding:18px}.pl-tpl p{font-size:.95rem;line-height:1.7}
.pl-box{padding:16px 18px}.pl-box span{font-size:.95rem}
.pl-msg{font-size:.98rem}
.pl-why{font-size:.96rem;padding:14px 18px;line-height:1.7}
.pl-mcq-ctx{padding:14px 18px;font-size:.98rem}
.pl-nav{margin-top:32px;padding-top:22px}
.pl-small{font-size:.88rem}
.pl-fig{margin:6px 0 26px;background:#fcfaff;border:1px solid #f1ecf6;border-radius:20px;padding:22px 20px 14px}
.pl-fig svg{display:block;width:100%;max-width:700px;height:auto;margin:0 auto}
.pl-fig figcaption{font-size:.85rem;color:var(--ink-3);text-align:center;margin-top:12px;line-height:1.5}
@media (max-width:640px){html{font-size:100%}.vhl-app{padding:16px 12px 22px}.pl-card{padding:18px 2px 2px}.pl-card h2{font-size:1.32rem}.pl-head{padding:16px}.pl-fig{overflow-x:auto;padding:14px 10px 10px}.pl-fig svg{min-width:540px}}

/* Câu mẫu ngoại ngữ có phát âm */
.pl-phr{display:grid;gap:10px}
.pl-ph{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"zh say" "py say" "vi say";gap:3px 14px;align-items:center;border:1px solid var(--line);border-radius:16px;padding:14px 18px;background:#fff}
.pl-ph .zh{grid-area:zh;font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;font-size:1.4rem;color:var(--ink)}
.pl-ph .py{grid-area:py;color:var(--acc);font-weight:600;font-size:.95rem}
.pl-ph .vi{grid-area:vi;color:var(--ink-2);font-size:.98rem}
.pl-ph .vi small{display:block;color:var(--ink-3);font-size:.82rem;margin-top:2px}
.pl-say{grid-area:say;width:48px;height:48px;border-radius:50%;border:1.5px solid var(--acc-100);background:var(--acc-50);font-size:1.15rem;cursor:pointer}
.pl-say:hover{background:#fbe0eb}