:root{--ink: #0b1324;--ink-2: #1e293b;--muted: #5b6577;--muted-2: #6b7689;--line: #e6eaf1;--line-2: #eef1f6;--paper: #ffffff;--bg: #f7f9fc;--bg-tint: #f0f4fb;--blue: #2563eb;--blue-bright: #3b82f6;--blue-deep: #1d4ed8;--emerald: #10b981;--emerald-deep: #059669;--warm: #f59e0b;--gold: #fbbf24;--success: #16a34a;--danger: #e11d48;--danger-soft: #fb7185;--grad: linear-gradient(120deg, #2563eb 0%, #3b82f6 42%, #10b981 100%);--grad-soft: linear-gradient(120deg, #2563eb 0%, #10b981 100%);--grad-deep: linear-gradient(135deg, #0b1f4d 0%, #143a8a 45%, #0c6b54 100%);--r-sm: 10px;--r-md: 14px;--r-lg: 20px;--r-xl: 28px;--r-pill: 999px;--sh-xs: 0 1px 2px rgba(11, 19, 36, .05);--sh-sm: 0 2px 6px rgba(11, 19, 36, .06), 0 1px 2px rgba(11, 19, 36, .04);--sh-md: 0 8px 24px rgba(15, 30, 70, .08), 0 2px 6px rgba(15, 30, 70, .05);--sh-lg: 0 18px 48px rgba(15, 30, 70, .12), 0 6px 16px rgba(15, 30, 70, .07);--sh-xl: 0 32px 80px rgba(15, 30, 70, .18), 0 10px 28px rgba(15, 30, 70, .09);--sh-ring: 0 0 0 4px 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h2{font-size:clamp(1.9rem,4vw,2.6rem);margin-top:10px}.section-sub{color:var(--muted);font-size:1.05rem;margin-top:14px}.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);background:linear-gradient(90deg,var(--blue),var(--emerald));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}.card-elevated{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-md)}.btn{--btn-pad-y: 11px;--btn-pad-x: 20px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:var(--btn-pad-y) var(--btn-pad-x);border:1px solid transparent;border-radius:var(--r-pill);font-weight:700;font-size:.95rem;line-height:1.2;white-space:nowrap;cursor:pointer;transition:transform .2s var(--ease),box-shadow .25s 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28px;font-size:1.02rem}.btn-block{display:flex;width:100%}.site-header{position:sticky;top:0;z-index:50;background:#ffffffb8;-webkit-backdrop-filter:saturate(180%) blur(16px);backdrop-filter:saturate(180%) blur(16px);border-bottom:1px solid transparent;transition:box-shadow .3s var(--ease),border-color .3s var(--ease),background-color .3s var(--ease)}.site-header.is-scrolled{border-bottom-color:var(--line);box-shadow:0 6px 24px #0f1e4612;background:#ffffffd9}.nav{display:flex;align-items:center;gap:20px;min-height:var(--header-h)}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;flex-shrink:0}.brand:hover{color:var(--ink)}.brand-mark{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:11px;background-image:var(--grad);color:#fff;font-weight:800;font-size:1rem;letter-spacing:-.04em;box-shadow:0 6px 16px #2563eb59,inset 0 1px 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0%,rgba(16,185,129,.18),transparent 60%);pointer-events:none}.footer-grid{position:relative;display:grid;grid-template-columns:1.2fr 2fr;gap:40px;padding-bottom:40px}.brand-footer,.brand-footer:hover,.brand-footer .brand-text{color:#fff}.footer-tag{margin-top:14px;max-width:32ch;color:#aab8d6;font-size:.95rem}.footer-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}.footer-cols h4{color:#fff;font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:14px}.footer-cols a{display:block;color:#aab8d6;font-size:.94rem;padding:5px 0}.footer-cols a:hover{color:#fff}.footer-bottom{position:relative;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;padding-top:24px;border-top:1px solid rgba(255,255,255,.12);font-size:.82rem;color:#8294b8}.hero{position:relative;overflow:hidden;padding-block:clamp(48px,8vw,96px) clamp(56px,9vw,104px)}.hero-bg{position:absolute;inset:-10% -10% auto;height:130%;z-index:0;background:radial-gradient(42% 50% at 18% 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div{display:flex;flex-direction:column}.hero-stats strong{font-size:clamp(1.5rem,3vw,2rem);font-weight:800;letter-spacing:-.02em;color:var(--ink)}.hero-stats span{font-size:.8rem;color:var(--muted);letter-spacing:.01em}.hero-visual{position:relative;perspective:1200px;transform-style:preserve-3d}.hero-img{width:100%;max-width:640px;margin-inline:auto;height:auto;filter:drop-shadow(0 30px 60px rgba(15,30,70,.16))}.hero-qcard{position:absolute;bottom:6%;left:-4%;width:min(300px,78%);padding:18px;border-radius:var(--r-lg);background:#ffffffc7;-webkit-backdrop-filter:blur(14px) saturate(150%);backdrop-filter:blur(14px) saturate(150%);border:1px solid rgba(255,255,255,.7);box-shadow:var(--sh-xl);transform-style:preserve-3d;transition:transform .25s var(--ease);will-change:transform}.qcard-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.qcard-tag{font-size:.72rem;font-weight:700;letter-spacing:.04em;color:#fff;background-image:var(--grad);padding:4px 10px;border-radius:var(--r-pill)}.qcard-hot{font-size:.76rem;font-weight:600;color:var(--warm)}.qcard-q{font-size:.92rem;font-weight:600;line-height:1.5;color:var(--ink)}.qcard-opts{display:flex;flex-direction:column;gap:7px;margin-top:14px}.qopt{font-size:.82rem;font-weight:600;color:var(--ink-2);padding:8px 12px;border-radius:var(--r-sm);background:#0f1e460a;border:1px solid var(--line)}.qopt.is-correct{color:var(--emerald-deep);background:#10b9811f;border-color:#10b98166}.trusted{padding-block:clamp(28px,4vw,44px);border-bottom:1px solid var(--line)}.trusted-label{text-align:center;font-size:.78rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--muted-2);margin-bottom:18px}.trusted-row{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 14px}.trusted-item{font-weight:700;font-size:.9rem;color:var(--muted);padding:8px 16px;border-radius:var(--r-pill);background:var(--paper);border:1px solid var(--line)}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.feature-card{position:relative;overflow:hidden;padding:28px;border-radius:var(--r-lg);background:var(--paper);border:1px solid var(--line);box-shadow:var(--sh-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease)}.feature-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:#2563eb40}.feature-card h3{font-size:1.22rem;margin-bottom:8px}.feature-card p{color:var(--muted);font-size:.98rem}.feature-lg{grid-column:span 2;display:grid;grid-template-columns:1fr;background:radial-gradient(70% 120% at 100% 0%,rgba(16,185,129,.08),transparent 60%),var(--paper)}.feature-icon{display:inline-grid;place-items:center;width:52px;height:52px;font-size:1.5rem;border-radius:14px;margin-bottom:18px;background:linear-gradient(135deg,#2563eb1f,#10b9811f);border:1px solid rgba(37,99,235,.14)}.feature-img{margin-top:22px;width:100%;border-radius:var(--r-md);border:1px solid var(--line-2)}.feature-lg .feature-img{max-height:280px;object-fit:cover}.page-hero{position:relative;overflow:hidden;text-align:center;padding-block:clamp(56px,9vw,104px) clamp(36px,5vw,56px);background:radial-gradient(50% 80% at 50% -10%,rgba(37,99,235,.12),transparent 60%),radial-gradient(40% 60% at 85% 0%,rgba(16,185,129,.1),transparent 60%),var(--bg)}.page-title{font-size:clamp(2rem,4.4vw,3rem);margin-top:12px}.page-lead{max-width:56ch;margin:16px auto 0;color:var(--muted);font-size:1.08rem}.hero-pills{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:26px}.pill{font-size:.85rem;font-weight:600;color:var(--ink-2);padding:7px 16px;border-radius:var(--r-pill);background:var(--paper);border:1px solid var(--line);box-shadow:var(--sh-xs)}.paper-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:22px}.paper-card{display:flex;flex-direction:column;padding:26px;border-radius:var(--r-lg);background:var(--paper);border:1px solid var(--line);box-shadow:var(--sh-sm);color:var(--ink);transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease)}.paper-card:hover{transform:translateY(-5px);box-shadow:var(--sh-lg);border-color:#2563eb47;color:var(--ink)}.paper-card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.paper-no{display:inline-grid;place-items:center;min-width:48px;height:36px;padding-inline:10px;font-weight:800;font-size:.95rem;color:#fff;border-radius:var(--r-sm);background-image:var(--grad);box-shadow:0 6px 14px #2563eb42}.paper-count{font-size:.82rem;font-weight:600;color:var(--muted)}.paper-card h3{font-size:1.18rem;margin-bottom:8px}.paper-card p{color:var(--muted);font-size:.95rem;flex-grow:1}.paper-go{display:inline-block;margin-top:16px;font-weight:700;font-size:.9rem;color:var(--blue);transition:transform .2s var(--ease)}.paper-card:hover .paper-go{transform:translate(4px)}.paper-topics{display:flex;flex-wrap:wrap;gap:6px;margin:14px 0 6px}.topic-chip{font-size:.72rem;font-weight:600;color:var(--ink-2);padding:4px 10px;border-radius:var(--r-pill);background:#2563eb12;border:1px solid rgba(37,99,235,.12)}.paper-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.paper-actions .btn{flex:1;min-width:120px}.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;align-items:stretch}.price-card{position:relative;display:flex;flex-direction:column;padding:32px 28px;border-radius:var(--r-xl);background:var(--paper);border:1px solid var(--line);box-shadow:var(--sh-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease)}.price-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg)}.price-card h3{font-size:1.3rem}.price-card.is-pop{border-color:transparent;background:linear-gradient(var(--paper),var(--paper)) padding-box,var(--grad) border-box;border:2px solid transparent;box-shadow:var(--sh-xl);transform:scale(1.035)}.price-card.is-pop:hover{transform:scale(1.035) translateY(-4px)}.price-badge{position:absolute;top:-13px;left:50%;transform:translate(-50%);white-space:nowrap;font-size:.74rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:#fff;padding:6px 16px;border-radius:var(--r-pill);background-image:var(--grad);box-shadow:0 8px 18px #2563eb4d}.price-amt{display:flex;align-items:baseline;gap:10px;margin-top:18px}.price-amt .was{font-size:1.05rem;color:var(--muted-2);text-decoration:line-through}.price-amt .now{font-size:2.6rem;font-weight:800;letter-spacing:-.03em;color:var(--ink)}.price-period{font-size:.9rem;margin-top:4px}.price-feats{display:flex;flex-direction:column;gap:11px;margin:22px 0;flex-grow:1}.price-feats li{position:relative;padding-left:28px;font-size:.95rem;color:var(--ink-2)}.price-feats li:before{content:"";position:absolute;left:0;top:3px;width:18px;height:18px;border-radius:50%;background:#10b98124;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23059669' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");background-size:12px;background-position:center;background-repeat:no-repeat}.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.testi-card{display:flex;flex-direction:column;padding:28px;border-radius:var(--r-lg);background:var(--paper);border:1px solid var(--line);box-shadow:var(--sh-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease)}.testi-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg)}.testi-stars{color:var(--gold);letter-spacing:2px;font-size:1rem;margin-bottom:14px}.testi-card blockquote{font-size:1.05rem;line-height:1.6;color:var(--ink-2);flex-grow:1}.testi-card figcaption{display:flex;align-items:center;gap:12px;margin-top:22px;font-weight:700;font-size:.95rem;color:var(--ink)}.testi-av{display:inline-grid;place-items:center;width:44px;height:44px;border-radius:50%;font-weight:800;color:#fff;background-image:var(--grad);box-shadow:0 6px 14px #2563eb4d;flex-shrink:0}.faq-list{display:flex;flex-direction:column;gap:12px}.faq-item{border:1px solid var(--line);border-radius:var(--r-md);background:var(--paper);box-shadow:var(--sh-xs);overflow:hidden;transition:border-color .25s var(--ease),box-shadow .25s var(--ease)}.faq-item[open]{border-color:#2563eb4d;box-shadow:var(--sh-sm)}.faq-item summary{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;font-weight:700;font-size:1.02rem;color:var(--ink);cursor:pointer;list-style:none}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary:after{content:"+";flex-shrink:0;display:grid;place-items:center;width:28px;height:28px;font-size:1.3rem;font-weight:600;color:var(--blue);border-radius:50%;background:#2563eb14;transition:transform .25s var(--ease),background-color .2s var(--ease)}.faq-item[open] summary:after{content:"\2013";transform:rotate(180deg);background:#10b9811f;color:var(--emerald-deep)}.faq-item p{padding:0 22px 20px;color:var(--muted);font-size:.98rem;line-height:1.7}.cta-band{position:relative;overflow:hidden;padding-block:clamp(56px,8vw,88px);background:var(--grad-deep);text-align:center}.cta-band:before{content:"";position:absolute;inset:0;background:radial-gradient(40% 90% at 15% 0%,rgba(16,185,129,.28),transparent 60%),radial-gradient(40% 90% at 85% 100%,rgba(59,130,246,.3),transparent 60%);pointer-events:none}.cta-band .container{position:relative}.cta-band h2{color:#fff;font-size:clamp(1.7rem,3.6vw,2.5rem);margin-bottom:28px;max-width:18ch;margin-inline:auto}.quiz-stage{padding-block:clamp(40px,7vw,80px)}.quiz-setup{max-width:720px;margin-inline:auto;padding:clamp(26px,4vw,40px)}.quiz-setup-head{text-align:center;margin-bottom:28px}.quiz-setup-head h1{font-size:clamp(1.6rem,3.2vw,2.1rem);margin-top:8px}.setup-grid{display:flex;flex-direction:column;gap:22px}.field{display:flex;flex-direction:column;gap:8px}.field>label,.field>span{font-weight:700;font-size:.9rem;color:var(--ink-2)}.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.input,select.input,input.input{width:100%;padding:12px 14px;font:inherit;font-size:.98rem;color:var(--ink);background:#fbfcfe;border:1px solid var(--line);border-radius:var(--r-md);transition:border-color .2s var(--ease),box-shadow .2s var(--ease),background-color .2s 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10px}.mock-hot{color:var(--warm);font-weight:600}.mock-acts{color:var(--muted-2);letter-spacing:2px}.mock-q{font-weight:600;color:var(--ink);line-height:1.5;margin:0}.mock-q.sm{font-size:.9rem;font-weight:500;color:var(--muted)}.mock-opts{display:flex;flex-direction:column;gap:8px}.mock-opt{border:1px solid var(--line);border-radius:var(--r-md);padding:10px 14px;font-size:.92rem;color:var(--ink-2);background:var(--paper)}.mock-opt.is-correct{border-color:var(--emerald);background:#10b9811a;color:var(--emerald-deep);font-weight:600}.mock-opt.is-wrong{border-color:var(--danger-soft);background:#e11d4812;color:var(--danger)}.mock-expl{font-size:.86rem;color:var(--ink-2);background:var(--bg-tint);border-left:3px solid var(--emerald);border-radius:8px;padding:10px 12px;line-height:1.5}.mock-expl 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.bar{height:8px;border-radius:999px;background:var(--bg-tint);overflow:hidden}.mock-weak-row .bar b{display:block;height:100%;background:var(--danger-soft)}.mock-weak-row.ok .bar b{background:var(--emerald)}.mock-weak-row em{font-style:normal;font-weight:700;color:var(--danger);text-align:right}.mock-weak-row.ok em{color:var(--emerald-deep)}.mock-lang{display:flex;flex-direction:column;gap:14px}.mock-lang-toggle{display:inline-flex;align-self:flex-start;border:1px solid var(--line);border-radius:var(--r-pill);overflow:hidden;font-size:.82rem;font-weight:600}.mock-lang-toggle span{padding:6px 16px;color:var(--muted)}.mock-lang-toggle span.on{background:var(--blue);color:#fff}.mock-lang-cols{display:grid;grid-template-columns:1fr 1fr;gap:14px}.mock-lang-cols h5{margin:0 0 6px;font-size:.74rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}.mock-lang-cols p{margin:0;font-size:.9rem;color:var(--ink);line-height:1.5}.tour{position:relative}.tour>input[type=radio]{position:absolute;opacity:0;pointer-events:none}.tour-tabs{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:26px}.tour-tabs label{cursor:pointer;padding:9px 18px;border-radius:var(--r-pill);font-weight:600;font-size:.92rem;color:var(--muted);border:1px solid var(--line);background:var(--paper);transition:all .15s ease}.tour-tabs label:hover{color:var(--ink);border-color:var(--blue-bright)}.tour-panel{display:none;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center}#tour-study:checked~.tour-stage .tour-study,#tour-exam:checked~.tour-stage .tour-exam,#tour-dash:checked~.tour-stage .tour-dash,#tour-lang:checked~.tour-stage .tour-lang{display:grid}#tour-study:checked~.tour-tabs label[for=tour-study],#tour-exam:checked~.tour-tabs label[for=tour-exam],#tour-dash:checked~.tour-tabs label[for=tour-dash],#tour-lang:checked~.tour-tabs label[for=tour-lang]{background:var(--blue);color:#fff;border-color:var(--blue)}.tour-copy h3{font-size:1.5rem;margin:0 0 12px}.tour-copy p{color:var(--muted);font-size:1.05rem;line-height:1.7}@media(max-width:820px){.tour-panel{grid-template-columns:1fr;gap:20px}.hero-visual .device-frame{margin:0 auto}}@media(prefers-reduced-motion:reduce){.tour-tabs label{transition:none}}[data-theme=dark] .mock-cell.s-f{color:#fbbf24}[data-theme=dark] .mock-cell.s-a{color:#93c5fd}[data-theme=dark] .mock-cell.s-c{color:#6ee7b7}[data-theme=dark] .mock-cell.s-w,[data-theme=dark] .mock-weak-row em{color:#fda4af}[data-theme=dark] .mock-weak-row.ok em{color:#6ee7b7}.device-frame.shot .device-screen{padding:0}.shot-img{display:block;width:100%;height:auto}.shot-rows{display:flex;flex-direction:column;gap:48px}.shot-row{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}.shot-row:nth-child(2n) .shot-row-media{order:-1}.shot-row-copy h3{font-size:1.45rem;margin:0 0 12px}.shot-row-copy p{color:var(--muted);font-size:1.05rem;line-height:1.7;margin:0 0 14px}.paper-shot{max-width:560px;margin:8px auto 0}@media(max-width:820px){.shot-row{grid-template-columns:1fr;gap:20px}.shot-row:nth-child(2n) .shot-row-media{order:0}}.device-cluster{display:flex;align-items:flex-end;justify-content:center;gap:0;margin:8px auto 0;max-width:760px;padding:10px 0}.device-cluster .dev img{display:block;width:100%;height:100%;object-fit:cover;object-position:top center}.dev-laptop{position:relative;z-index:2;width:min(520px,60vw);flex:0 0 auto}.dev-laptop .dev-screen{border:12px solid #1f2937;border-bottom:0;border-radius:16px 16px 0 0;aspect-ratio:16 / 10;overflow:hidden;background:#0b1220;box-shadow:0 22px 50px #0208172e}.dev-laptop .dev-base{width:122%;margin-left:-11%;height:16px;background:linear-gradient(#e2e8f0,#aeb8c7);border-radius:0 0 14px 14px;box-shadow:0 10px 18px #02081724;position:relative}.dev-laptop .dev-base:after{content:"";position:absolute;top:0;left:50%;transform:translate(-50%);width:96px;height:7px;background:#94a3b8;border-radius:0 0 8px 8px}.dev-tablet{position:relative;z-index:1;width:178px;flex:0 0 auto;margin:0 -52px 26px 0;border:11px solid #1f2937;border-radius:22px;aspect-ratio:3 / 4;overflow:hidden;background:#0b1220;box-shadow:0 16px 34px #02081729}.dev-phone{position:relative;z-index:3;width:124px;flex:0 0 auto;margin:0 0 10px -54px;border:8px solid #0f172a;border-radius:26px;aspect-ratio:9 / 19;overflow:hidden;background:#0b1220;box-shadow:0 18px 36px #02081738}.dev-phone:before{content:"";position:absolute;top:6px;left:50%;transform:translate(-50%);width:46px;height:5px;background:#0f172a;border-radius:999px;z-index:4}@media(max-width:560px){.device-cluster{transform:scale(.82);transform-origin:top 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auto}.paper-link-name{font-weight:600;color:var(--ink);font-size:.92rem;line-height:1.3}.paper-link-live{margin-left:auto;color:var(--success);font-size:.6rem}@media(max-width:640px){.paper-hero-facts{grid-template-columns:repeat(2,1fr)}}.paper-trust{margin-top:16px;font-size:.9rem}.paper-stars{color:var(--gold);letter-spacing:1px}.sample-card{background:var(--paper);border:1px solid var(--line);border-top:3px solid var(--accent);border-radius:var(--r-lg);padding:24px;box-shadow:0 12px 30px #0208170f}.sample-meta{font-size:.82rem;color:var(--muted);margin-bottom:10px}.sample-q{font-size:1.1rem;font-weight:600;color:var(--ink);line-height:1.6;margin:0 0 16px;white-space:pre-line}.sample-opts{display:flex;flex-direction:column;gap:9px;margin-bottom:16px}.sample-opt{display:flex;align-items:flex-start;gap:12px;border:1px solid var(--line);border-radius:var(--r-md);padding:11px 14px;color:var(--ink-2);line-height:1.5}.sample-opt.is-correct{border-color:var(--emerald);background:#10b98114;color:var(--emerald-deep);font-weight:600}.sample-opt-key{flex:0 0 auto;width:24px;height:24px;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;background:var(--bg-tint);font-weight:700;font-size:.8rem}.sample-opt.is-correct .sample-opt-key{background:var(--emerald);color:#fff}.sample-reveal{margin:4px 0 16px;border-top:1px dashed var(--line);padding-top:14px}.sample-reveal summary{cursor:pointer;font-weight:600;color:var(--accent)}.sample-answer{margin:10px 0 6px}.sample-expl{color:var(--ink-2);line-height:1.7;margin:0;white-space:pre-line}.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.why-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);padding:24px;border-top:3px solid var(--accent)}.why-ico{font-size:1.8rem;margin-bottom:10px}.why-card h3{font-size:1.08rem;margin:0 0 8px;color:var(--ink)}.why-card p{color:var(--muted);font-size:.96rem;line-height:1.65;margin:0}.compare-table{width:100%;border-collapse:collapse;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}.compare-table th,.compare-table td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line);font-size:.95rem}.compare-table thead th{background:var(--bg-tint);font-weight:700;color:var(--ink)}.compare-table td{color:var(--ink-2)}.compare-table .c-us{text-align:center;font-weight:700;color:var(--emerald-deep);background:#10b9810f}.compare-table th.c-us{color:var(--blue-deep);background:#2563eb14}.compare-table .c-them{text-align:center;color:var(--muted)}.compare-table tbody tr:last-child td{border-bottom:0}@media(max-width:820px){.why-grid{grid-template-columns:1fr}}.t-zh,.t-en{display:block}[data-disp=zh] .t-en,[data-disp=en] .t-zh{display:none}[data-disp=both] 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