:root{
  --black:#0a0a0a;--ink:#1d1d1f;--ink-2:#43434a;--muted:#6e6e73;--line:#e6e6ea;
  --white:#ffffff;--bg:#fbfbfd;--bg-2:#f5f5f7;
  --glass:rgba(255,255,255,0.62);--glass-strong:rgba(255,255,255,0.78);--glass-line:rgba(255,255,255,0.55);
  --shadow-sm:0 1px 2px rgba(0,0,0,.04),0 4px 14px rgba(0,0,0,.05);
  --shadow:0 8px 30px rgba(0,0,0,.08),0 2px 6px rgba(0,0,0,.04);
  --shadow-lg:0 30px 80px rgba(0,0,0,.14);
  --r-sm:14px;--r:20px;--r-lg:28px;--r-xl:40px;
  --maxw:1120px;
  --sf:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","SF Pro Icons","Inter","Helvetica Neue",Helvetica,Arial,sans-serif;
  --ease:cubic-bezier(.22,1,.36,1);--ease-2:cubic-bezier(.16,1,.3,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--sf);background:var(--bg);color:var(--ink);line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
::selection{background:#0a0a0a;color:#fff}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.center{text-align:center}

/* ---------- Typography ---------- */
h1,h2,h3,h4{letter-spacing:-.022em;font-weight:700;color:var(--ink);line-height:1.06}
.display{font-size:clamp(44px,8vw,104px);font-weight:800;letter-spacing:-.04em;line-height:.98}
.h-xl{font-size:clamp(34px,5.2vw,64px);font-weight:800;letter-spacing:-.03em}
.h-lg{font-size:clamp(28px,3.6vw,44px);font-weight:700}
.h-md{font-size:clamp(22px,2.4vw,30px);font-weight:700}
.lead{font-size:clamp(18px,2.1vw,24px);color:var(--ink-2);font-weight:450;letter-spacing:-.01em}
.eyebrow{font-size:14px;font-weight:650;letter-spacing:.02em;color:var(--muted);text-transform:none}
.grad-ink{background:linear-gradient(180deg,#111 0%,#444 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.muted{color:var(--muted)}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;font-size:16px;font-weight:550;padding:13px 26px;border-radius:980px;transition:transform .35s var(--ease),background .3s,box-shadow .35s,color .3s;will-change:transform}
.btn:active{transform:scale(.96)}
.btn-primary{background:var(--black);color:#fff;box-shadow:var(--shadow-sm)}
.btn-primary:hover{background:#000;transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-ghost{background:rgba(0,0,0,.045);color:var(--ink)}
.btn-ghost:hover{background:rgba(0,0,0,.08);transform:translateY(-2px)}
.btn-glass{background:var(--glass-strong);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);border:1px solid var(--glass-line);color:var(--ink)}
.btn-glass:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-lg{padding:16px 34px;font-size:18px}
.btn .arrow{transition:transform .35s var(--ease)}
.btn:hover .arrow{transform:translateX(4px)}

/* ---------- Glass nav ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .4s var(--ease),box-shadow .4s,backdrop-filter .4s}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:54px;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.nav.scrolled{background:var(--glass);backdrop-filter:blur(22px) saturate(180%);-webkit-backdrop-filter:blur(22px) saturate(180%);border-bottom:1px solid rgba(0,0,0,.06)}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:19px;letter-spacing:-.02em}
.brand .dot{width:11px;height:11px;border-radius:50%;background:#0a0a0a;box-shadow:0 0 0 4px rgba(10,10,10,.08)}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:14.5px;color:var(--ink-2);font-weight:480;transition:color .25s,opacity .25s}
.nav-links a:hover{color:var(--ink)}
.nav-cta{display:flex;align-items:center;gap:14px}
.nav-toggle{display:none;flex-direction:column;gap:5px;width:30px;height:30px;justify-content:center;align-items:center}
.nav-toggle span{width:20px;height:1.6px;background:var(--ink);border-radius:2px;transition:transform .35s var(--ease),opacity .25s}
.nav.open .nav-toggle span:nth-child(1){transform:translateY(6.6px) rotate(45deg)}
.nav.open .nav-toggle span:nth-child(2){opacity:0}
.nav.open .nav-toggle span:nth-child(3){transform:translateY(-6.6px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{position:relative;padding:170px 0 90px;text-align:center;overflow:hidden}
.hero .lead{max-width:680px;margin:24px auto 0}
.hero-cta{display:flex;gap:14px;justify-content:center;margin-top:38px;flex-wrap:wrap}
.hero-note{margin-top:18px;font-size:14px;color:var(--muted)}
.blob{position:absolute;border-radius:50%;filter:blur(60px);opacity:.5;z-index:-1;animation:float 18s var(--ease) infinite}
.blob.b1{width:520px;height:520px;background:radial-gradient(circle,rgba(0,0,0,.08),transparent 70%);top:-160px;left:-120px}
.blob.b2{width:420px;height:420px;background:radial-gradient(circle,rgba(120,120,160,.10),transparent 70%);top:40px;right:-140px;animation-delay:-6s}
@keyframes float{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(30px,40px) scale(1.08)}}

/* hero device mock */
.hero-mock{margin:60px auto 0;max-width:960px;border-radius:var(--r-xl);background:var(--glass-strong);backdrop-filter:blur(30px) saturate(180%);-webkit-backdrop-filter:blur(30px) saturate(180%);border:1px solid var(--glass-line);box-shadow:var(--shadow-lg);overflow:hidden;transform:perspective(1600px) rotateX(8deg);transition:transform 1.1s var(--ease)}
.hero-mock.in{transform:perspective(1600px) rotateX(0deg)}
.mock-bar{display:flex;align-items:center;gap:7px;padding:14px 18px;border-bottom:1px solid rgba(0,0,0,.06)}
.mock-bar i{width:11px;height:11px;border-radius:50%;background:#d8d8de;display:inline-block}
.mock-body{padding:26px;display:grid;grid-template-columns:200px 1fr;gap:22px;min-height:300px;text-align:left}
.mock-side{display:flex;flex-direction:column;gap:10px}
.mock-pill{height:34px;border-radius:10px;background:rgba(0,0,0,.04)}
.mock-pill.active{background:#0a0a0a}
.mock-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.mock-card{height:96px;border-radius:16px;background:rgba(0,0,0,.035);border:1px solid rgba(0,0,0,.05)}

/* ---------- Sections ---------- */
section{position:relative}
.section{padding:100px 0}
.section-head{max-width:760px;margin:0 auto 60px;text-align:center}
.section-head .lead{margin-top:16px}

/* ---------- Reveal animation ---------- */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .9s var(--ease-2),transform .9s var(--ease-2)}
.reveal.in{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.08s}.reveal[data-d="2"]{transition-delay:.16s}.reveal[data-d="3"]{transition-delay:.24s}.reveal[data-d="4"]{transition-delay:.32s}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1!important;transform:none!important;transition:none}.hero-mock{transform:none!important}.blob{animation:none}}

/* ---------- Glass feature cards ---------- */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card-grid.cols-2{grid-template-columns:repeat(2,1fr)}
.card{position:relative;padding:30px;border-radius:var(--r-lg);background:var(--glass-strong);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);border:1px solid var(--glass-line);box-shadow:var(--shadow-sm);transition:transform .5s var(--ease),box-shadow .5s;overflow:hidden}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.card::before{content:"";position:absolute;inset:0;background:linear-gradient(140deg,rgba(255,255,255,.5),transparent 45%);pointer-events:none}
.card .ic{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:#0a0a0a;color:#fff;font-size:22px;margin-bottom:18px}
.card h3{font-size:21px;margin-bottom:8px}
.card p{color:var(--muted);font-size:15.5px}

/* ---------- Big feature band ---------- */
.band{padding:110px 0;background:#0a0a0a;color:#fff;border-radius:var(--r-xl);margin:0 24px;overflow:hidden;position:relative}
.band .wrap{max-width:980px}
.band h2,.band h3{color:#fff}
.band .lead{color:rgba(255,255,255,.7)}
.band .eyebrow{color:rgba(255,255,255,.5)}
.band-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:50px}
.band-card{padding:28px;border-radius:var(--r);background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);backdrop-filter:blur(8px)}
.band-card h3{font-size:20px;margin-bottom:6px}
.band-card p{color:rgba(255,255,255,.62);font-size:15px}
.glow{position:absolute;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.10),transparent 70%);top:-200px;right:-100px;pointer-events:none}

/* ---------- Marquee ---------- */
.marquee{overflow:hidden;-webkit-mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent)}
.marquee-row{display:flex;gap:14px;width:max-content;animation:scroll 38s linear infinite}
.marquee:hover .marquee-row{animation-play-state:paused}
@keyframes scroll{to{transform:translateX(-50%)}}
.chip{white-space:nowrap;padding:11px 20px;border-radius:980px;background:var(--white);border:1px solid var(--line);font-weight:550;font-size:15px;box-shadow:var(--shadow-sm)}

/* ---------- Subject grid ---------- */
.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.subject{padding:20px 18px;border-radius:var(--r);background:var(--white);border:1px solid var(--line);transition:transform .4s var(--ease),box-shadow .4s,border-color .3s;cursor:default}
.subject:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.subject .emoji{font-size:24px}
.subject .name{font-weight:600;font-size:15px;margin-top:10px}
.subject .sub{font-size:12.5px;color:var(--muted);margin-top:2px}

/* ---------- Pricing ---------- */
.price-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;max-width:780px;margin:0 auto}
.plan{position:relative;padding:38px 34px;border-radius:var(--r-lg);background:var(--white);border:1px solid var(--line);transition:transform .5s var(--ease),box-shadow .5s}
.plan:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.plan.feature{background:#0a0a0a;color:#fff;border-color:#0a0a0a}
.plan.feature .muted,.plan.feature .plan-sub{color:rgba(255,255,255,.6)}
.plan-badge{position:absolute;top:20px;right:20px;font-size:12px;font-weight:600;padding:6px 12px;border-radius:980px;background:rgba(255,255,255,.14);color:#fff}
.plan .name{font-size:15px;font-weight:600;letter-spacing:.01em}
.plan .price{font-size:52px;font-weight:800;letter-spacing:-.03em;margin:14px 0 2px}
.plan .price small{font-size:18px;font-weight:550;color:var(--muted)}
.plan.feature .price small{color:rgba(255,255,255,.6)}
.plan-sub{font-size:14px;color:var(--muted);margin-bottom:24px}
.plan ul{list-style:none;display:flex;flex-direction:column;gap:12px;margin-bottom:28px}
.plan li{display:flex;gap:10px;font-size:15px;align-items:flex-start}
.plan li .tick{flex:none;width:20px;height:20px;border-radius:50%;background:rgba(0,0,0,.06);display:grid;place-items:center;font-size:11px;margin-top:1px}
.plan.feature li .tick{background:rgba(255,255,255,.16);color:#fff}
.plan .btn{width:100%;justify-content:center}
.save-note{text-align:center;margin-top:22px;font-size:14px;color:var(--muted)}

/* ---------- FAQ ---------- */
.faq{max-width:760px;margin:0 auto}
.faq details{border-bottom:1px solid var(--line);padding:22px 4px}
.faq summary{list-style:none;cursor:pointer;font-weight:600;font-size:18px;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary .pm{flex:none;width:26px;height:26px;display:grid;place-items:center;border-radius:50%;background:rgba(0,0,0,.05);transition:transform .35s var(--ease)}
.faq details[open] summary .pm{transform:rotate(45deg)}
.faq p{color:var(--muted);font-size:15.5px;margin-top:14px;max-width:640px}

/* ---------- CTA band ---------- */
.cta{padding:120px 0;text-align:center}
.cta .h-xl{margin-bottom:18px}

/* ---------- Footer ---------- */
.footer{padding:64px 0 48px;border-top:1px solid var(--line);background:var(--bg-2)}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:30px;margin-bottom:40px}
.footer h4{font-size:13px;color:var(--muted);font-weight:600;margin-bottom:14px;letter-spacing:.02em}
.footer ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.footer a{font-size:14.5px;color:var(--ink-2);transition:color .2s}
.footer a:hover{color:var(--ink)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;padding-top:24px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}

/* ---------- Auth ---------- */
.auth-wrap{min-height:100vh;display:grid;place-items:center;padding:90px 20px 40px;position:relative}
.auth-card{width:100%;max-width:420px;padding:40px 34px;border-radius:var(--r-lg);background:var(--glass-strong);backdrop-filter:blur(26px) saturate(180%);-webkit-backdrop-filter:blur(26px) saturate(180%);border:1px solid var(--glass-line);box-shadow:var(--shadow-lg)}
.auth-card h1{font-size:28px;text-align:center}
.auth-card .sub{text-align:center;color:var(--muted);margin:8px 0 26px;font-size:15px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;font-weight:550;margin-bottom:7px;color:var(--ink-2)}
.field input{width:100%;padding:13px 15px;border-radius:13px;border:1px solid var(--line);background:rgba(255,255,255,.7);font-size:15px;font-family:inherit;transition:border-color .25s,box-shadow .25s,background .25s}
.field input:focus{outline:none;border-color:#0a0a0a;box-shadow:0 0 0 4px rgba(10,10,10,.08);background:#fff}
.auth-card .btn{width:100%;justify-content:center;margin-top:6px}
.auth-alt{text-align:center;margin-top:20px;font-size:14px;color:var(--muted)}
.auth-alt a{color:var(--ink);font-weight:550}
.auth-divider{display:flex;align-items:center;gap:12px;margin:20px 0;color:var(--muted);font-size:13px}
.auth-divider::before,.auth-divider::after{content:"";flex:1;height:1px;background:var(--line)}
.msg{padding:11px 14px;border-radius:12px;font-size:14px;margin-bottom:14px;display:none}
.msg.show{display:block}
.msg.err{background:#fdeaea;color:#a31515}
.msg.ok{background:#eaf7ee;color:#1a7a35}

/* ---------- App / dashboard ---------- */
.app-shell{padding-top:54px;min-height:100vh}
.app-head{padding:40px 0 22px}
.app-head h1{font-size:32px}
.app-head p{color:var(--muted);margin-top:6px}
.toolbar{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:22px 0 8px}
.search{flex:1;min-width:220px;position:relative}
.search input{width:100%;padding:12px 16px 12px 42px;border-radius:980px;border:1px solid var(--line);background:var(--white);font-size:15px;font-family:inherit}
.search input:focus{outline:none;border-color:#0a0a0a;box-shadow:0 0 0 4px rgba(10,10,10,.06)}
.search svg{position:absolute;left:15px;top:50%;transform:translateY(-50%);opacity:.4}
.select{padding:12px 16px;border-radius:980px;border:1px solid var(--line);background:var(--white);font-size:14.5px;font-family:inherit;cursor:pointer}
.crumbs{display:flex;gap:8px;align-items:center;font-size:14px;color:var(--muted);margin:18px 0;flex-wrap:wrap}
.crumbs a{color:var(--ink);font-weight:550;cursor:pointer}
.crumbs span.sep{opacity:.5}
.file-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;padding-bottom:60px}
.file{display:flex;flex-direction:column;gap:6px;padding:20px;border-radius:var(--r);background:var(--white);border:1px solid var(--line);transition:transform .4s var(--ease),box-shadow .4s;cursor:pointer;text-align:left}
.file:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.file .ic{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;font-size:20px;background:rgba(0,0,0,.05);margin-bottom:8px}
.file.folder .ic{background:#0a0a0a;color:#fff}
.file .fname{font-weight:600;font-size:15px;word-break:break-word}
.file .fmeta{font-size:12.5px;color:var(--muted)}
.empty{text-align:center;padding:80px 20px;color:var(--muted)}
.skeleton{height:130px;border-radius:var(--r);background:linear-gradient(100deg,rgba(0,0,0,.04) 30%,rgba(0,0,0,.07) 50%,rgba(0,0,0,.04) 70%);background-size:200% 100%;animation:shimmer 1.4s infinite}
@keyframes shimmer{to{background-position:-200% 0}}
.lock-banner{display:flex;gap:14px;align-items:center;padding:18px 22px;border-radius:var(--r);background:#0a0a0a;color:#fff;margin:18px 0}
.lock-banner .btn{margin-left:auto}

/* ---------- Account ---------- */
.acct{max-width:680px;margin:0 auto;padding:40px 0 80px}
.acct-card{padding:30px;border-radius:var(--r-lg);background:var(--white);border:1px solid var(--line);margin-bottom:20px;box-shadow:var(--shadow-sm)}
.acct-row{display:flex;justify-content:space-between;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}
.acct-row:last-child{border-bottom:none}
.acct-row .k{color:var(--muted);font-size:14px}
.acct-row .v{font-weight:600;font-size:15px}
.badge{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:980px;font-size:13px;font-weight:600}
.badge.free{background:rgba(0,0,0,.06);color:var(--ink)}
.badge.pro{background:#0a0a0a;color:#fff}

/* ---------- Responsive ---------- */
@media(max-width:900px){
  .card-grid,.band-grid,.price-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .mock-body{grid-template-columns:1fr}
  .mock-side{flex-direction:row;overflow:auto}
  .mock-pill{min-width:110px}
}
@media(max-width:760px){
  .nav-links,.nav-cta .btn-ghost{display:none}
  .nav-toggle{display:flex}
  .nav-menu{position:fixed;inset:54px 0 auto 0;background:var(--glass);backdrop-filter:blur(26px) saturate(180%);-webkit-backdrop-filter:blur(26px) saturate(180%);border-bottom:1px solid rgba(0,0,0,.08);flex-direction:column;align-items:stretch;gap:0;padding:12px 24px 22px;transform:translateY(-130%);transition:transform .5s var(--ease);display:flex}
  .nav.open .nav-menu{transform:translateY(0)}
  .nav-menu a{padding:14px 0;border-bottom:1px solid rgba(0,0,0,.05);font-size:16px}
  .hero{padding:130px 0 60px}
  .section{padding:70px 0}
  .band{margin:0 14px;padding:70px 0}
  .footer-grid{grid-template-columns:1fr 1fr}
}