/* Landing page dùng chung cho markpageai.com và markreup.com. Màu theo data-theme trên <html>. */
:root{
  --wrap:1180px; --gutter:clamp(16px,4vw,40px);
  --radius:22px; --radius-sm:14px;
  --font:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --ease:cubic-bezier(.2,.7,.1,1);
}
html[data-theme=page]{
  --bg:#0b0909; --bg-2:#141010; --bg-3:#100c0c; --band:#050404;
  --text:#f7f1f0; --muted:#b0a3a1; --dim:#7b6f6d;
  --line:rgba(255,255,255,.08); --line-2:rgba(255,255,255,.15);
  --brand:#ef4444; --brand-2:#f87171; --brand-soft:rgba(239,68,68,.12); --on-brand:#fff;
  --grad:linear-gradient(120deg,#b91c1c 0%,#e11d48 60%,#fb7185 120%);
  --shadow:0 30px 90px -30px rgba(220,38,38,.45);
  color-scheme:dark;
}
html[data-theme=reup]{
  --bg:#08080a; --bg-2:#111114; --bg-3:#18181c; --band:#000;
  --text:#f6f2ee; --muted:#a39b94; --dim:#6f6862;
  --line:rgba(255,255,255,.08); --line-2:rgba(255,255,255,.15);
  --brand:#f97316; --brand-2:#ef4444; --brand-soft:rgba(249,115,22,.1); --on-brand:#160800;
  --grad:linear-gradient(120deg,#f97316 0%,#ef4444 70%,#db2777 130%);
  --shadow:0 30px 90px -30px rgba(249,115,22,.45);
  color-scheme:dark;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.65;overflow-x:hidden;-webkit-font-smoothing:antialiased}
img,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
::selection{background:var(--brand);color:var(--on-brand)}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:6px}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.55em;min-height:52px;padding:0 26px;border-radius:999px;font-weight:700;font-size:15px;border:1px solid transparent;transition:transform .3s var(--ease),box-shadow .3s var(--ease),background .3s,border-color .3s;white-space:nowrap}
.btn svg{width:18px;height:18px;flex:none}
.btn-main{background:var(--grad);color:#fff;box-shadow:0 14px 40px -12px var(--brand)}
html[data-theme=reup] .btn-main{color:#fff}
.btn-main:hover{transform:translateY(-2px);box-shadow:0 20px 50px -12px var(--brand)}
.btn-ghost{background:transparent;border-color:var(--line-2);color:var(--text)}
.btn-ghost:hover{border-color:var(--brand);background:var(--brand-soft);transform:translateY(-2px)}
.btn-sm{min-height:40px;padding:0 18px;font-size:14px}
.btn-lg{min-height:60px;padding:0 34px;font-size:17px}

/* nav */
.nav{position:fixed;inset:0 0 auto;z-index:50;transition:background .35s,border-color .35s,backdrop-filter .35s;border-bottom:1px solid transparent}
.nav.is-scrolled{background:color-mix(in srgb,var(--bg) 78%,transparent);backdrop-filter:blur(16px) saturate(1.4);-webkit-backdrop-filter:blur(16px) saturate(1.4);border-bottom-color:var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:68px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:-.02em}
.brand img{width:34px;height:34px;border-radius:9px}
.logo-mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--grad);color:#fff;font-weight:900;font-size:16px}
.nav-links{display:flex;gap:28px;font-size:14.5px;color:var(--muted);font-weight:500}
.nav-links a:hover{color:var(--text)}
.nav-cta{display:flex;gap:10px;align-items:center}
@media (max-width:860px){.nav-links{display:none}.nav-cta .btn-ghost{display:none}}

/* hero */
.hero{position:relative;padding:130px 0 70px;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:-1;overflow:hidden}
.hero-bg video,.hero-bg img{width:100%;height:100%;object-fit:cover}
.hero-bg::after{content:"";position:absolute;inset:0}
.hero-bg::after{background:linear-gradient(90deg,var(--bg) 0%,color-mix(in srgb,var(--bg) 70%,transparent) 45%,color-mix(in srgb,var(--bg) 35%,transparent) 100%),linear-gradient(180deg,transparent 55%,var(--bg))}
@media (max-width:960px){.hero-bg::after{background:color-mix(in srgb,var(--bg) 78%,transparent)}}
.hero-grid{display:grid;grid-template-columns:1.02fr 1fr;gap:56px;align-items:center}
.hero-grid>*,.pain>*,.show>*,.price-wrap>*{min-width:0}
@media (max-width:560px){.btn{white-space:normal;text-align:center}.btn-lg{min-height:56px;padding:12px 24px;font-size:16px}.hero-actions .btn{width:100%}}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 14px 6px 8px;border-radius:999px;background:var(--brand-soft);border:1px solid color-mix(in srgb,var(--brand) 25%,transparent);color:var(--brand);font-size:13px;font-weight:700}
.eyebrow i{width:8px;height:8px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) 25%,transparent)}
.hero h1{font-size:clamp(36px,5.2vw,64px);line-height:1.08;letter-spacing:-.035em;font-weight:900;margin:18px 0 18px}
.hero .lead{font-size:clamp(16px,1.6vw,19px);color:var(--muted);margin:0 0 30px;max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.trust{display:flex;flex-wrap:wrap;gap:8px 20px;margin:26px 0 0;padding:0;list-style:none;font-size:14px;color:var(--muted);font-weight:500}
.trust li{display:flex;gap:7px;align-items:center}
.trust li::before{content:"";width:16px;height:16px;border-radius:50%;background:var(--brand-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 8.2l2.2 2.2 4.8-4.8' fill='none' stroke='%23e0452b' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat}
.hero-visual{position:relative}
.window{border-radius:16px;overflow:hidden;background:var(--bg-2);border:1px solid var(--line-2);box-shadow:var(--shadow)}
.window-bar{display:flex;gap:6px;align-items:center;padding:10px 14px;border-bottom:1px solid var(--line);background:var(--bg-3)}
.window-bar i{width:10px;height:10px;border-radius:50%;background:var(--line-2)}
.window-bar i:first-child{background:#ff5f57}.window-bar i:nth-child(2){background:#febc2e}.window-bar i:nth-child(3){background:#28c840}
.window-bar span{margin-left:10px;font-size:12px;color:var(--dim);font-weight:600}
.hero-visual .window{transform:perspective(1600px) rotateY(-7deg) rotateX(3deg);transition:transform .8s var(--ease)}
.hero-visual:hover .window{transform:none}
.float-card{position:absolute;display:flex;gap:10px;align-items:center;padding:12px 16px;border-radius:14px;background:var(--bg-2);border:1px solid var(--line);box-shadow:0 18px 40px -18px rgba(0,0,0,.35);font-size:13.5px;font-weight:600;animation:bob 6s ease-in-out infinite}
.float-card b{display:block;font-size:12px;color:var(--dim);font-weight:600}
.float-card .dot{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:var(--brand-soft);color:var(--brand);font-size:17px}
.fc-1{left:-28px;bottom:42px}.fc-2{right:-18px;top:-22px;animation-delay:-3s}
@keyframes bob{50%{transform:translateY(-10px)}}
@media (max-width:960px){.hero-grid{grid-template-columns:1fr;gap:40px}.hero{padding-top:110px}.fc-1{left:8px}.fc-2{right:8px}.hero-visual .window{transform:none}}

/* strip */
.strip{padding:18px 0 10px}
.strip-in{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:12px 34px;color:var(--dim);font-weight:700;font-size:15px}
.strip-in span.label{font-weight:500;font-size:13px;text-transform:uppercase;letter-spacing:.12em}
.chip{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:var(--bg-2);color:var(--text);font-size:14px;font-weight:600}

/* sections */
.sec{padding:96px 0}
.sec-head{max-width:720px;margin:0 auto 52px;text-align:center}
.kicker{display:inline-block;font-size:13px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--brand);margin-bottom:12px}
.sec h2{font-size:clamp(28px,3.6vw,46px);line-height:1.15;letter-spacing:-.03em;font-weight:900;margin:0 0 14px}
.sec-head p{color:var(--muted);font-size:17px;margin:0}

/* pain */
.pain{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.pain-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);aspect-ratio:4/3}
.pain-img img{width:100%;height:100%;object-fit:cover}
.pain h2{text-align:left}
.pain-list{list-style:none;padding:0;margin:22px 0 22px;display:grid;gap:14px}
.pain-list li{display:flex;gap:14px;padding:16px 18px;border-radius:var(--radius-sm);background:var(--bg-2);border:1px solid var(--line);color:var(--muted)}
.pain-list li::before{content:"✕";flex:none;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:var(--brand-soft);color:var(--brand);font-weight:800;font-size:12px}
.pain-close{font-weight:600;font-size:17px}
@media (max-width:900px){.pain{grid-template-columns:1fr}}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:s}
.step{position:relative;padding:28px 24px;border-radius:var(--radius);background:var(--bg-2);border:1px solid var(--line);counter-increment:s;transition:transform .35s var(--ease),border-color .35s}
.step:hover{transform:translateY(-4px);border-color:color-mix(in srgb,var(--brand) 40%,transparent)}
.step::before{content:counter(s,decimal-leading-zero);display:block;font-size:44px;font-weight:900;line-height:1;margin-bottom:18px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.step h3{margin:0 0 8px;font-size:18px;letter-spacing:-.01em}
.step p{margin:0;color:var(--muted);font-size:15px}
@media (max-width:960px){.steps{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.steps{grid-template-columns:1fr}}

/* features */
.feat-groups{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.feat{padding:30px;border-radius:var(--radius);background:var(--bg-2);border:1px solid var(--line)}
.feat-top{display:flex;align-items:center;gap:14px;margin-bottom:16px}
.feat-ico{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;background:var(--grad);color:#fff;font-size:22px;flex:none}
.feat h3{margin:0;font-size:20px;letter-spacing:-.02em}
.feat ul{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.feat li{color:var(--muted);font-size:15px;padding-left:22px;position:relative}
.feat li::before{content:"";position:absolute;left:0;top:.62em;width:10px;height:10px;border-radius:3px;background:var(--brand);opacity:.85}
.feat li b{color:var(--text)}
@media (max-width:860px){.feat-groups{grid-template-columns:1fr}}

/* showcase */
.show{display:grid;grid-template-columns:1.25fr 1fr;gap:40px;align-items:center;margin-top:70px}
.show.rev{grid-template-columns:1fr 1.25fr}
.show.rev .show-media{order:2}
.show-media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line)}
.show-media img,.show-media video{width:100%}
.show h3{font-size:clamp(22px,2.4vw,30px);letter-spacing:-.025em;margin:0 0 12px;line-height:1.2}
.show p{color:var(--muted);margin:0 0 14px}
@media (max-width:900px){.show,.show.rev{grid-template-columns:1fr}.show.rev .show-media{order:0}}

/* band (dark section) */
.band{background:var(--band);color:#f6f2ee;position:relative;overflow:hidden}
.band .sec-head p{color:#b8aca7}
.band-bg{position:absolute;inset:0;opacity:.35}
.band-bg img,.band-bg video{width:100%;height:100%;object-fit:cover}
.band-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,var(--band),rgba(0,0,0,.35) 40%,var(--band))}
.band .wrap{position:relative}

/* pricing */
.price-wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;max-width:980px;margin:0 auto;align-items:stretch}
.plan{position:relative;padding:36px;border-radius:26px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.14);backdrop-filter:blur(10px)}
.plan::before{content:"";position:absolute;inset:-1px;border-radius:inherit;padding:1px;background:var(--grad);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none}
.plan-tag{display:inline-block;padding:5px 12px;border-radius:999px;background:var(--grad);color:#fff;font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase}
.plan h3{font-size:24px;margin:16px 0 6px}
.plan .for{color:#b8aca7;margin:0 0 20px;font-size:15px}
.price{display:flex;align-items:baseline;gap:8px;margin:0 0 24px}
.price b{font-size:clamp(40px,5vw,56px);font-weight:900;letter-spacing:-.04em;line-height:1}
.price span{color:#b8aca7;font-weight:600}
.plan ul{list-style:none;padding:0;margin:0 0 28px;display:grid;gap:11px}
.plan li{display:flex;gap:10px;font-size:15px;color:#e8dfda}
.plan li::before{content:"✓";flex:none;color:var(--brand-2);font-weight:900}
.plan .btn{width:100%}
.plan-note{margin:14px 0 0;font-size:13px;color:#8f847f;text-align:center}
.guarantee{padding:32px;border-radius:26px;border:1px dashed rgba(255,255,255,.22);display:flex;flex-direction:column;justify-content:center;gap:14px}
.guarantee .seal{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;background:var(--grad);font-size:28px}
.guarantee h3{margin:0;font-size:22px}
.guarantee p{margin:0;color:#b8aca7}
@media (max-width:860px){.price-wrap{grid-template-columns:1fr}}

/* faq */
.faq{max-width:820px;margin:0 auto;display:grid;gap:12px}
.faq details{border-radius:var(--radius-sm);background:var(--bg-2);border:1px solid var(--line);padding:0 22px;transition:border-color .3s}
.faq details[open]{border-color:color-mix(in srgb,var(--brand) 40%,transparent)}
.faq summary{list-style:none;cursor:pointer;padding:20px 30px 20px 0;font-weight:700;font-size:16.5px;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);font-size:24px;font-weight:400;color:var(--brand);transition:transform .3s}
.faq details[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq details p{margin:0 0 20px;color:var(--muted)}

/* cta */
.cta{padding:90px 0}
.cta-box{position:relative;border-radius:32px;overflow:hidden;padding:70px 40px;text-align:center;background:var(--band);color:#fff}
.cta-box .band-bg{opacity:.5}
.cta-box h2{position:relative;font-size:clamp(28px,4vw,48px);letter-spacing:-.03em;margin:0 0 14px;font-weight:900}
.cta-box p{position:relative;color:#d7ccc7;margin:0 auto 30px;max-width:600px;font-size:17px}
.cta-box .hero-actions{position:relative;justify-content:center}
.cta-box .btn-ghost{color:#fff;border-color:rgba(255,255,255,.3)}

/* footer */
.foot{padding:50px 0 40px;border-top:1px solid var(--line);color:var(--muted);font-size:14px}
.foot-top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px;margin-bottom:24px}
.foot-links{display:flex;flex-wrap:wrap;gap:10px 22px}
.foot-links a:hover{color:var(--text)}
.foot small{display:block;color:var(--dim);font-size:12.5px;line-height:1.6;margin-top:8px;max-width:900px}

/* reveal */
.rv{opacity:0;transform:translateY(24px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none}.float-card{animation:none}html{scroll-behavior:auto}}

/* legal pages */
.legal{padding:120px 0 60px;max-width:820px}
.legal h1{font-size:clamp(28px,4vw,42px);letter-spacing:-.03em;margin:0 0 10px}
.legal h2{font-size:20px;margin:30px 0 8px}
.legal p,.legal li{color:var(--muted)}