/* Lộ trình US CPA — VDK. Hiệu ứng chỉ dùng transform/opacity (và nét vẽ một lần), chạy khi nằm trong màn hình. */
:root{
  --bg:#f5f7fb;--surface:#fff;--surface-2:#eef2f8;--border:#dbe3ee;--text:#1b2433;--muted:#5d6b80;--heading:#0f1a2b;
  --brand:#1d4ed8;--brand-2:#0e7490;--brand-ink:#fff;--accent:#d97706;--ok:#15803d;--ok-bg:#e7f6ec;--warn:#a16207;--warn-bg:#fdf6e3;--bad:#b42318;--bad-bg:#fdecea;
  --c-intro:#0284c7;--c-base:#0d9488;--c-far:#2563eb;--c-aud:#7c3aed;--c-reg:#c2410c;--c-disc:#be185d;--c-final:#15803d;
  --shadow:0 1px 2px rgba(15,26,43,.06),0 8px 24px -16px rgba(15,26,43,.35);
  --radius:14px;--font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color-scheme:light;
}
:root[data-theme=dark],:root[data-theme=auto].sys-dark{
  --bg:#0b1420;--surface:#111c2b;--surface-2:#16243a;--border:#22334d;--text:#d8e2f0;--muted:#8fa1ba;--heading:#f1f5fb;
  --brand:#60a5fa;--brand-2:#22d3ee;--brand-ink:#08111d;--accent:#fbbf24;--ok:#4ade80;--ok-bg:#12301f;--warn:#fbbf24;--warn-bg:#33270c;--bad:#f87171;--bad-bg:#3a1515;
  --c-intro:#38bdf8;--c-base:#2dd4bf;--c-far:#60a5fa;--c-aud:#a78bfa;--c-reg:#fb923c;--c-disc:#f472b6;--c-final:#4ade80;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px -18px rgba(0,0,0,.8);
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.6;-webkit-text-size-adjust:100%}
body{min-height:100vh;display:flex;flex-direction:column}
a{color:var(--brand)}
h1,h2,h3{color:var(--heading);line-height:1.25;margin:0 0 .5em}
h1{font-size:clamp(1.7rem,4.5vw,2.6rem);letter-spacing:-.02em}
h2{font-size:clamp(1.25rem,3vw,1.6rem)}
h3{font-size:1.08rem}
p{margin:0 0 .9em}
.muted{color:var(--muted)}.small{font-size:.86rem}
.skip{position:absolute;left:-999px;top:0}.skip:focus{left:12px;top:12px;z-index:50;background:var(--surface);padding:8px 12px;border-radius:8px}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;padding:10px max(16px,env(safe-area-inset-right)) 10px max(16px,env(safe-area-inset-left));background:var(--bg);border-bottom:1px solid var(--border)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--heading);min-width:0}
.brand-text{display:flex;flex-direction:column;line-height:1.15}.brand-text b{font-size:1rem;white-space:nowrap}.brand-text small{color:var(--muted);font-size:.74rem}
.mainnav{display:flex;gap:4px;margin-left:auto}
.mainnav a{padding:8px 12px;border-radius:10px;text-decoration:none;color:var(--muted);font-weight:600;font-size:.92rem;white-space:nowrap}
.mainnav a[aria-current=page]{color:var(--heading);background:var(--surface-2)}
.icon-btn{border:1px solid var(--border);background:var(--surface);border-radius:12px;width:42px;height:42px;display:grid;place-items:center;cursor:pointer;color:var(--muted);flex-shrink:0}
.settings{position:fixed;right:12px;top:66px;z-index:30;width:min(340px,calc(100vw - 24px));background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}
.settings h2{font-size:1.05rem}
.settings fieldset{border:0;padding:0;margin:0 0 12px}.settings legend{font-weight:700;font-size:.86rem;color:var(--muted);margin-bottom:4px}
.settings label{display:flex;gap:8px;align-items:center;padding:3px 0;font-size:.94rem}
main{flex:1;width:100%;max-width:1080px;margin:0 auto;padding:22px 16px 40px}
main:focus{outline:none}
.loading{padding:60px 0;text-align:center;color:var(--muted)}
.footer{display:flex;flex-wrap:wrap;gap:8px 16px;justify-content:space-between;padding:16px;border-top:1px solid var(--border);font-size:.82rem;color:var(--muted)}
.footer-links{display:flex;gap:14px;flex-wrap:wrap}
.noscript{padding:16px;text-align:center}

/* ---------- common ---------- */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:9px 16px;border-radius:12px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-weight:600;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--surface-2)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:var(--brand-ink)}
.btn.primary:hover{filter:brightness(1.08)}
.btn.small{min-height:36px;padding:6px 12px;font-size:.88rem}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.grid{display:grid;gap:16px}
.pill{display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:3px 10px;font-size:.78rem;font-weight:700;background:var(--surface-2);color:var(--muted);white-space:nowrap}
.pill.ok{background:var(--ok-bg);color:var(--ok)}.pill.warn{background:var(--warn-bg);color:var(--warn)}
.callout{border-left:4px solid var(--brand);background:var(--surface-2);border-radius:10px;padding:12px 14px;margin:0 0 14px;font-size:.94rem}
.callout.warn{border-color:var(--warn)}
.crumbs{font-size:.86rem;color:var(--muted);margin-bottom:10px;display:flex;flex-wrap:wrap;gap:6px}
.crumbs a{color:var(--muted)}
.bar{height:8px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.bar>i{display:block;height:100%;width:100%;background:linear-gradient(90deg,var(--brand),var(--brand-2));transform-origin:left;transform:scaleX(var(--p,0));transition:transform .5s ease}
[data-stage=intro]{--sc:var(--c-intro)}[data-stage=base]{--sc:var(--c-base)}[data-stage=far]{--sc:var(--c-far)}[data-stage=aud]{--sc:var(--c-aud)}
[data-stage=reg]{--sc:var(--c-reg)}[data-stage=disc]{--sc:var(--c-disc)}[data-stage=final]{--sc:var(--c-final)}

/* ---------- home ---------- */
.hero{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:24px;align-items:center;margin-bottom:26px}
.hero .lead{font-size:1.08rem;color:var(--muted);max-width:56ch}
.hero-stats{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0 18px}
.stat{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:8px 12px;min-width:96px}
.stat b{display:block;font-size:1.3rem;color:var(--heading);line-height:1.2}.stat span{font-size:.78rem;color:var(--muted)}
.hero-art{width:100%;height:auto}
.roadmap{position:relative;display:grid;gap:14px;margin:8px 0 24px}
.stage-card{position:relative;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:14px;align-items:center;text-decoration:none;color:inherit;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;box-shadow:var(--shadow);border-left:5px solid var(--sc)}
.stage-card:hover{border-color:var(--sc)}
.stage-num{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;font-weight:800;color:#fff;background:var(--sc);font-size:1.05rem}
.stage-card h3{margin:0 0 2px}.stage-card p{margin:0;color:var(--muted);font-size:.9rem}
.ring{width:52px;height:52px}.ring circle{fill:none;stroke-width:5}.ring .bg{stroke:var(--surface-2)}.ring .fg{stroke:var(--sc);stroke-linecap:round;transform:rotate(-90deg);transform-origin:center;transition:stroke-dashoffset .6s ease}
.ring text{font-size:12px;font-weight:700;fill:var(--heading);text-anchor:middle;dominant-baseline:central}
.two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.credits{font-size:.86rem;color:var(--muted)}

/* ---------- stage & step ---------- */
.stage-head{border-radius:var(--radius);padding:20px;margin-bottom:18px;background:linear-gradient(135deg,color-mix(in srgb,var(--sc) 22%,var(--surface)),var(--surface));border:1px solid var(--border)}
.stage-head .tag{color:var(--sc);font-weight:800;letter-spacing:.06em;font-size:.78rem;text-transform:uppercase}
.outcomes{margin:10px 0 0;padding-left:20px}
.steps{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.step-link{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:12px;align-items:center;text-decoration:none;color:inherit;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:12px 14px}
.step-link:hover{border-color:var(--sc)}
.check{width:28px;height:28px;border-radius:50%;border:2px solid var(--border);display:grid;place-items:center;color:transparent;flex-shrink:0}
.check.done{background:var(--ok);border-color:var(--ok);color:#fff}
.step-link b{display:block}.step-link small{color:var(--muted)}
.step-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:20px;align-items:start}
.step-side{position:sticky;top:78px;display:grid;gap:14px}
.section{margin:0 0 22px}
.section>h2{font-size:1.15rem;display:flex;align-items:center;gap:8px}
.goals,.practice,.sources{padding-left:20px;margin:0}
.goals li,.practice li{margin:4px 0}
.terms{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}
.term{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:10px 12px;font-size:.92rem}
.term b{display:block;color:var(--heading)}
.anim-panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow)}
.anim-panel figcaption{font-size:.9rem;color:var(--muted);margin-top:8px}
.anim-panel .row{justify-content:space-between}
.anim{width:100%;height:auto;display:block}
.summary p{font-size:1.02rem}
.nav-steps{display:flex;justify-content:space-between;gap:10px;margin-top:20px;flex-wrap:wrap}
.done-btn.on{background:var(--ok);border-color:var(--ok);color:#fff}

/* ---------- video (bấm mới tải) ---------- */
.videos{display:grid;gap:12px}
.video{border:1px solid var(--border);border-radius:12px;overflow:hidden;background:var(--surface)}
.video-cover{position:relative;display:block;width:100%;aspect-ratio:16/9;border:0;padding:0;cursor:pointer;background:linear-gradient(135deg,#0f2747,#0e4a5c);color:#fff;text-align:left}
.video-cover .vc-title{position:absolute;left:14px;right:14px;bottom:12px;font-weight:700;font-size:.98rem;line-height:1.3}
.video-cover .vc-meta{position:absolute;left:14px;top:12px;font-size:.78rem;opacity:.85}
.video-cover .vc-play{position:absolute;left:50%;top:44%;width:64px;height:64px;margin:-32px 0 0 -32px;border-radius:50%;background:rgba(255,255,255,.95);display:grid;place-items:center}
.video-cover .vc-play::after{content:"";border-style:solid;border-width:11px 0 11px 18px;border-color:transparent transparent transparent #b91c1c;margin-left:5px}
.video-cover:hover .vc-play{transform:scale(1.06)}
.video iframe{display:block;width:100%;aspect-ratio:16/9;border:0}
.video-info{padding:10px 12px;font-size:.88rem;display:flex;flex-wrap:wrap;gap:6px 12px;justify-content:space-between}
.video-note{color:var(--muted);flex-basis:100%}

/* ---------- quiz ---------- */
.quiz{display:grid;gap:14px}
.q{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px}
.q p{font-weight:600;margin-bottom:10px}
.opts{display:grid;gap:8px}
.opt{display:flex;gap:10px;align-items:flex-start;text-align:left;width:100%;min-height:44px;border:1px solid var(--border);border-radius:10px;background:var(--surface-2);padding:9px 12px;cursor:pointer}
.opt .k{font-weight:800;color:var(--muted)}
.opt.right{border-color:var(--ok);background:var(--ok-bg)}.opt.wrong{border-color:var(--bad);background:var(--bad-bg)}
.explain{margin-top:10px;font-size:.92rem;border-left:3px solid var(--brand);padding-left:10px}
.score{font-weight:700}

/* ---------- checklist & note ---------- */
.checklist{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.checklist label{display:flex;gap:10px;align-items:flex-start;cursor:pointer}
.checklist input{width:20px;height:20px;margin-top:3px;accent-color:var(--ok)}
textarea.note{width:100%;min-height:110px;border:1px solid var(--border);border-radius:10px;background:var(--surface);padding:10px;resize:vertical}

/* ---------- planner ---------- */
.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px}
.form-grid label{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:.92rem}
.form-grid input,.form-grid select{min-height:44px;border:1px solid var(--border);border-radius:10px;background:var(--surface);padding:8px 10px;font-weight:400}
.plan-list{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.plan-item{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:12px 14px;border-left:5px solid var(--sc)}
.plan-item .when{font-weight:800;color:var(--sc);min-width:92px;font-size:.9rem}
.plan-item ul{margin:6px 0 0;padding-left:18px;font-size:.92rem}
.week{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:6px;font-size:.78rem}
.day{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:8px 6px;min-height:120px}
.day b{display:block;font-size:.8rem;margin-bottom:4px}
.block{border-radius:6px;padding:3px 5px;margin:3px 0;color:#fff;font-size:.72rem;line-height:1.25}
.b-new{background:#2563eb}.b-mcq{background:#7c3aed}.b-rev{background:#0d9488}.b-tbs{background:#c2410c}.b-flash{background:#be185d}.b-mock{background:#15803d}

/* ---------- progress page ---------- */
.progress-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.danger{color:var(--bad);border-color:var(--bad)}

/* ---------- terms ---------- */
.legal h2{margin-top:22px}.legal li{margin:4px 0}

/* ---------- logo motion ---------- */
.logo .ls{transform-box:fill-box;transform-origin:50% 100%}
[data-motion-on] .logo-intro .ls{animation:growY .6s cubic-bezier(.2,.8,.2,1) both}
[data-motion-on] .logo-intro .s2{animation-delay:.12s}[data-motion-on] .logo-intro .s3{animation-delay:.24s}
.logo-check{stroke-dasharray:1;stroke-dashoffset:0}
[data-motion-on] .logo-intro .logo-check{animation:draw .7s .45s cubic-bezier(.6,0,.2,1) both}
.logo-shine{opacity:0}
[data-motion-on] .logo-intro .logo-shine{animation:shine 1s 1.1s ease-out both}
[data-motion-on] .brand:hover .logo .ls{animation:growY .45s cubic-bezier(.2,.8,.2,1)}
@keyframes growY{from{transform:scaleY(0)}to{transform:scaleY(1)}}
@keyframes growX{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes draw{from{stroke-dashoffset:1}to{stroke-dashoffset:0}}
@keyframes shine{0%{opacity:1;transform:translateX(0)}100%{opacity:1;transform:translateX(110px)}}
@keyframes fade{from{opacity:0}to{opacity:1}}
@keyframes pop{from{opacity:0;transform:scale(.55)}to{opacity:1;transform:none}}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@keyframes drop{from{opacity:0;transform:translateY(-40px)}to{opacity:1;transform:none}}
@keyframes slideL{from{opacity:0;transform:translateX(-30px)}to{opacity:1;transform:none}}
@keyframes slideR{from{opacity:0;transform:translateX(30px)}to{opacity:1;transform:none}}
@keyframes blink2{0%,100%{opacity:1}50%{opacity:.25}}

/* ---------- SVG animations (anim.js) ---------- */
.anim text{font-family:var(--font);fill:var(--text);font-size:10px}
.anim .t-b{font-weight:700}.anim .t-s{font-size:8px;fill:var(--muted)}.anim .t-w{fill:#fff;font-weight:700}
.anim .ink{stroke:var(--text);fill:none}.anim .line{stroke:var(--border);fill:none}
.anim .fill-sc{fill:var(--sc,var(--brand))}.anim .fill-soft{fill:var(--surface-2)}.anim .fill-surf{fill:var(--surface)}
.anim .k-blue{fill:#2563eb}.anim .k-teal{fill:#0d9488}.anim .k-violet{fill:#7c3aed}.anim .k-orange{fill:#ea580c}.anim .k-rose{fill:#db2777}.anim .k-green{fill:#16a34a}.anim .k-amber{fill:#d97706}.anim .k-sky{fill:#0284c7}.anim .k-gray{fill:#94a3b8}
.anim .s-blue{stroke:#2563eb}.anim .s-orange{stroke:#ea580c}.anim .s-green{stroke:#16a34a}.anim .s-violet{stroke:#7c3aed}.anim .s-rose{stroke:#db2777}
.anim .gy,.anim .gx,.anim .pp{transform-box:fill-box}
.anim .gy{transform-origin:50% 100%}.anim .gx{transform-origin:0 50%}.anim .pp{transform-origin:50% 50%}
.anim .dr{stroke-dasharray:1;stroke-dashoffset:0}
[data-motion-on] .anim.play .gy{animation:growY .7s cubic-bezier(.2,.8,.2,1) both}
[data-motion-on] .anim.play .gx{animation:growX .7s cubic-bezier(.2,.8,.2,1) both}
[data-motion-on] .anim.play .pp{animation:pop .5s cubic-bezier(.2,.9,.3,1.2) both}
[data-motion-on] .anim.play .fd{animation:fade .6s ease both}
[data-motion-on] .anim.play .rs{animation:rise .6s ease both}
[data-motion-on] .anim.play .dp{animation:drop .7s cubic-bezier(.3,1.3,.5,1) both}
[data-motion-on] .anim.play .sl{animation:slideL .6s ease both}
[data-motion-on] .anim.play .sr{animation:slideR .6s ease both}
[data-motion-on] .anim.play .dr{animation:draw 1.4s ease-in-out both}
[data-motion-on] .anim.play .bl{animation:blink2 .9s ease-in-out 3}
.anim .d1{animation-delay:0.2s!important}.anim .d2{animation-delay:0.4s!important}.anim .d3{animation-delay:0.6s!important}.anim .d4{animation-delay:0.8s!important}
.anim .d5{animation-delay:1.0s!important}.anim .d6{animation-delay:1.2s!important}.anim .d7{animation-delay:1.4s!important}.anim .d8{animation-delay:1.6s!important}
.anim .d9{animation-delay:1.8s!important}.anim .d10{animation-delay:2.0s!important}.anim .d11{animation-delay:2.2s!important}.anim .d12{animation-delay:2.4s!important}
.anim .d13{animation-delay:2.6s!important}.anim .d14{animation-delay:2.8s!important}

/* ---------- responsive ---------- */
@media (max-width:900px){.step-layout{grid-template-columns:1fr}.step-side{position:static}.hero{grid-template-columns:1fr}.two{grid-template-columns:1fr}}
@media (max-width:640px){
  .mainnav{position:fixed;left:0;right:0;bottom:0;z-index:20;margin:0;justify-content:space-around;background:var(--surface);border-top:1px solid var(--border);padding:6px 6px calc(6px + env(safe-area-inset-bottom))}
  .mainnav a{font-size:.8rem;padding:8px 6px;text-align:center;flex:1}
  .icon-btn{margin-left:auto}
  body{padding-bottom:64px}
  main{padding:16px 16px 30px}
  .stage-card{grid-template-columns:auto minmax(0,1fr);}
  .stage-card .ring{display:none}
  .week{grid-template-columns:repeat(2,minmax(0,1fr))}
  .day{min-height:0}
  .plan-item{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{.topbar,.footer,.mainnav,.settings,.video-cover,.nav-steps{display:none!important}main{max-width:none}}

/* ---------- utility (thay cho style nội tuyến, để CSP chặn được inline style) ---------- */
.u0{flex-direction:row!important;align-items:center!important;gap:10px!important;font-weight:400!important}
.u1{margin-bottom:16px!important}
.u2{margin-top:10px!important}
.u3{margin-top:12px!important}
.u4{margin-top:14px!important}
.u5{margin-top:18px!important}
.u6{margin-top:20px!important}
.u7{margin-top:22px!important}
.u8{margin:10px 0 0!important}
.u9{margin:6px 0 0!important}
.u10{padding-left:18px!important;margin:0!important}
.u11{width:100%!important}
.u12{width:20px!important;height:20px!important;min-height:0!important}