/* ===== StudyAI Pro — Midnight Glass (dark) ===== */
*{box-sizing:border-box}
html,body{margin:0;padding:0}
:root{
  --bg:#0a0e27;
  --bg2:#0d1437;
  --ink:#e2e8f0;
  --muted:#94a3b8;
  --line:rgba(148,163,184,.12);
  --glass:rgba(255,255,255,.05);
  --glass2:rgba(255,255,255,.08);
  --neon:#22d3ee;
  --neon2:#a855f7;
  --neon3:#ec4899;
}
body{font-family:'Inter',system-ui,Segoe UI,Roboto,Arial,sans-serif;color:var(--ink);background:radial-gradient(ellipse 80% 60% at 20% 0%,#1e1b4b 0%,transparent 60%),radial-gradient(ellipse 70% 50% at 90% 30%,#1e2a5e 0%,transparent 60%),radial-gradient(ellipse 80% 60% at 50% 100%,#2d1b4e 0%,transparent 60%),linear-gradient(180deg,#0a0e27 0%,#0d1437 50%,#0a0e27 100%);background-attachment:fixed;min-height:100vh;line-height:1.55;-webkit-font-smoothing:antialiased;overflow-x:hidden;position:relative}
.wrap{max-width:1240px;margin:0 auto;padding:0 28px;position:relative;z-index:2}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit}
h1,h2,h3,.brand-name{font-family:'Space Grotesk',Inter,sans-serif;letter-spacing:-.02em}

/* background glow */
.bg-grid{display:none}
.bg-glow{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.g{position:absolute;border-radius:50%;filter:blur(140px);opacity:.45;animation:drift 24s ease-in-out infinite}
.g.g1{width:680px;height:680px;background:#7c3aed;top:-220px;left:-120px;animation-delay:0s}
.g.g2{width:580px;height:580px;background:#06b6d4;top:240px;right:-160px;animation-delay:-8s}
.g.g3{width:520px;height:520px;background:#ec4899;bottom:-140px;left:28%;opacity:.32;animation-delay:-16s}
@keyframes drift{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(40px,-30px) scale(1.05)}66%{transform:translate(-30px,40px) scale(.95)}}

/* glass */
.glass-dark{background:var(--glass);backdrop-filter:blur(24px) saturate(180%);-webkit-backdrop-filter:blur(24px) saturate(180%);border:1px solid var(--line);box-shadow:0 24px 60px -16px rgba(0,0,0,.55),inset 0 1px 0 rgba(255,255,255,.06)}

/* header */
.hdr{position:sticky;top:0;z-index:50;background:rgba(10,14,39,.65);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.hdr-row{display:flex;align-items:center;gap:24px;padding:14px 0}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;color:var(--ink)}
.brand-mark{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,#22d3ee,#a855f7);color:#0a0e27;display:inline-flex;align-items:center;justify-content:center;box-shadow:0 0 24px -4px rgba(34,211,238,.6)}
.brand-name{font-size:19px;font-weight:700}
.brand-name b{background:linear-gradient(90deg,#22d3ee,#a855f7);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:700}
.brand-name sup{font-size:10px;color:var(--neon);font-weight:600;margin-left:2px;letter-spacing:.1em}
.nav{display:flex;gap:28px;margin-left:auto;font-weight:500;color:#cbd5e1;font-size:14px}
.nav a:hover{color:var(--neon)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;cursor:pointer;font-weight:600;font-size:14.5px;transition:transform .15s, box-shadow .2s, background .15s, border-color .2s;padding:11px 20px;border-radius:10px;letter-spacing:-.005em}
.btn-pill{border-radius:999px;padding:11px 22px}
.btn-sm{padding:8px 16px;font-size:13.5px}
.btn-lg{padding:14px 26px;font-size:15.5px}
.btn-block{width:100%}
.btn-neon{background:linear-gradient(135deg,#22d3ee,#a855f7);color:#0a0e27;font-weight:700;box-shadow:0 0 0 1px rgba(34,211,238,.3),0 12px 32px -8px rgba(34,211,238,.55)}
.btn-neon:hover{transform:translateY(-1px);box-shadow:0 0 0 1px rgba(34,211,238,.5),0 18px 40px -10px rgba(168,85,247,.6)}
.btn-ghost{background:rgba(255,255,255,.04);color:var(--ink);border:1px solid var(--line);backdrop-filter:blur(10px)}
.btn-ghost:hover{background:rgba(255,255,255,.08);border-color:rgba(34,211,238,.4);color:var(--neon)}
.btn-max{background:#fff;color:#0a0e27}
.btn-max:hover{background:#e2e8f0}
.max-ico{width:18px;height:18px;background:#0a0e27;border-radius:5px;padding:2px;object-fit:contain}
.btn-max .max-ico{background:#0a0e27}
.btn-neon .max-ico{background:#0a0e27}

/* hero asymmetric */
.hero{padding:72px 0 64px}
.hero-asym{display:grid;grid-template-columns:80px 1.1fr .9fr;gap:36px;align-items:center}
.rail{display:flex;flex-direction:column;align-items:center;gap:14px;padding:18px 8px;border-radius:999px;background:rgba(255,255,255,.04);border:1px solid var(--line);backdrop-filter:blur(10px)}
.rail-pill{font-size:10.5px;font-weight:700;color:var(--neon);writing-mode:vertical-rl;transform:rotate(180deg);letter-spacing:.2em;text-transform:uppercase;padding:14px 0}
.rail-line{width:30px;height:1px;background:linear-gradient(90deg,transparent,#22d3ee,transparent)}
.rail-num{display:flex;flex-direction:column;align-items:center;gap:2px}
.rail-num b{font-size:18px;color:#fff;font-weight:700;font-family:'Space Grotesk'}
.rail-num span{font-size:10px;color:var(--muted);writing-mode:vertical-rl;transform:rotate(180deg);letter-spacing:.05em;margin-top:6px}

.hero-main h1{font-size:60px;line-height:1.02;margin:0 0 22px;font-weight:700;letter-spacing:-.03em}
.neon{background:linear-gradient(90deg,#22d3ee,#a855f7);-webkit-background-clip:text;background-clip:text;color:transparent;text-shadow:0 0 40px rgba(34,211,238,.3)}
.neon-cyan{background:linear-gradient(90deg,#22d3ee,#10b981);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:17px;color:var(--muted);margin:0 0 28px;max-width:540px;line-height:1.6}
.hero-cta{display:flex;gap:12px;margin-bottom:28px;flex-wrap:wrap}
.badges{display:flex;gap:10px;flex-wrap:wrap}
.badge{font-size:13px;font-weight:500;color:#cbd5e1;background:rgba(255,255,255,.04);border:1px solid var(--line);padding:7px 14px;border-radius:999px;backdrop-filter:blur(10px)}

.hero-card{position:relative;border-radius:24px;overflow:hidden;border:1px solid var(--line);min-height:380px;background:#0d1437}
.hc-img{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.55}
.hc-img::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent 30%,rgba(10,14,39,.95))}
.hc-overlay{position:absolute;left:0;right:0;bottom:0;padding:22px;display:flex;flex-direction:column;gap:10px;z-index:1}
.hc-line{display:flex;align-items:center;gap:10px;color:#cbd5e1;font-size:13.5px;font-family:'Space Grotesk';font-weight:500}
.hc-dot{width:8px;height:8px;border-radius:50%;background:var(--neon);box-shadow:0 0 12px var(--neon);animation:pulse 1.4s infinite}
.hc-dot.ok{background:#10b981;box-shadow:0 0 12px #10b981;animation:none}
.hc-progress{height:4px;border-radius:2px;background:rgba(255,255,255,.08);overflow:hidden;margin-top:6px}
.hc-progress i{display:block;height:100%;width:60%;background:linear-gradient(90deg,#22d3ee,#a855f7);border-radius:2px;animation:prog 2s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
@keyframes prog{0%{width:20%}50%{width:80%}100%{width:20%}}

/* sections */
.section{padding:72px 0;position:relative}
.section-head{margin-bottom:44px;max-width:780px}
.section-head h2{font-size:44px;font-weight:700;margin:0;line-height:1.1}
.kicker{display:inline-block;font-size:11.5px;font-weight:700;color:var(--neon);background:rgba(34,211,238,.1);padding:6px 14px;border-radius:999px;margin-bottom:16px;text-transform:uppercase;letter-spacing:.12em;border:1px solid rgba(34,211,238,.25)}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border-radius:24px;overflow:hidden;border:1px solid var(--line)}
.stat{padding:32px 24px;background:rgba(13,20,55,.7);backdrop-filter:blur(14px);text-align:center}
.stat b{display:block;font-size:42px;font-weight:700;font-family:'Space Grotesk';background:linear-gradient(135deg,#22d3ee,#a855f7);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1;margin-bottom:8px}
.stat span{font-size:13px;color:var(--muted)}

/* zigzag */
.zigzag{display:flex;flex-direction:column;gap:32px}
.zz{display:grid;grid-template-columns:1.2fr 1fr;gap:36px;align-items:center;padding:24px;border-radius:24px;background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(20px);transition:border-color .2s, box-shadow .2s}
.zz:hover{border-color:rgba(34,211,238,.4);box-shadow:0 0 0 1px rgba(34,211,238,.15),0 28px 60px -16px rgba(168,85,247,.3)}
.zz.reverse{grid-template-columns:1fr 1.2fr}
.zz.reverse .zz-img{order:2}
.zz-img{position:relative;height:280px;border-radius:18px;background-size:cover;background-position:center;overflow:hidden;border:1px solid var(--line)}
.zz-img::after{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(34,211,238,.15),rgba(168,85,247,.25))}
.zz-tag{position:absolute;top:14px;left:14px;z-index:1;font-family:'Space Grotesk';font-size:13px;font-weight:700;color:#0a0e27;background:linear-gradient(135deg,#22d3ee,#a855f7);padding:6px 12px;border-radius:8px}
.zz-body{padding:8px 12px}
.zz-body h3{margin:0 0 10px;font-size:24px;font-weight:700}
.zz-body p{margin:0 0 18px;color:var(--muted);font-size:15px;line-height:1.6}
.zz-body .btn span{transition:transform .15s}
.zz-body .btn:hover span{transform:translateX(4px)}

/* subjects horizontal scroll */
.subj-rail-wrap{padding:0 28px;overflow:hidden;mask-image:linear-gradient(90deg,transparent,#000 5%,#000 95%,transparent)}
.subj-rail{display:flex;gap:14px;padding:8px 0 24px;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none}
.subj-rail::-webkit-scrollbar{display:none}
.subj{flex:0 0 200px;padding:22px;border-radius:18px;background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(18px);scroll-snap-align:start;cursor:pointer;transition:transform .2s, border-color .2s, background .2s;display:flex;flex-direction:column;gap:14px}
.subj:hover{transform:translateY(-4px);border-color:rgba(34,211,238,.45);background:rgba(34,211,238,.06)}
.subj-ico{width:48px;height:48px;border-radius:13px;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:700;color:#0a0e27}
.subj-name{font-size:16px;font-weight:700;color:#fff;font-family:'Space Grotesk'}
.subj-meta{font-size:12px;color:var(--muted)}
.subj-arr{margin-top:auto;color:var(--neon);font-size:13px;font-weight:600;display:inline-flex;align-items:center;gap:4px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.step{padding:8px 8px 22px;border-radius:22px;background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(20px);display:flex;flex-direction:column;gap:14px;position:relative;transition:transform .2s, border-color .2s}
.step:hover{transform:translateY(-4px);border-color:rgba(34,211,238,.4)}
.step-num{position:absolute;top:-14px;left:18px;width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,#22d3ee,#a855f7);color:#0a0e27;display:flex;align-items:center;justify-content:center;font-weight:700;font-family:'Space Grotesk';font-size:14px;z-index:2;box-shadow:0 0 18px -2px rgba(34,211,238,.6)}
.step-img{height:160px;border-radius:14px;background-size:cover;background-position:center;border:1px solid var(--line);position:relative;overflow:hidden}
.step-img::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,14,39,.2),rgba(10,14,39,.8))}
.step h3{margin:0 14px;font-size:18px;font-weight:700}
.step p{margin:0 14px;color:var(--muted);font-size:14px;line-height:1.55}
.step .btn{margin:0 14px;margin-top:auto}

/* reviews */
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.review{padding:24px;border-radius:20px;background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(20px)}
.review-stars{color:#fbbf24;margin-bottom:10px;font-size:14px}
.review-text{font-size:14.5px;color:#cbd5e1;margin:0 0 18px;line-height:1.6}
.review-author{display:flex;align-items:center;gap:12px}
.review-avatar{width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,#22d3ee,#a855f7);color:#0a0e27;display:flex;align-items:center;justify-content:center;font-weight:700;font-family:'Space Grotesk';flex:none}
.review-name{font-weight:700;font-size:14px;color:#fff}
.review-meta{font-size:12px;color:var(--muted);margin-top:2px}

/* prices */
.prices{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;align-items:stretch}
.price{padding:30px 28px;border-radius:22px;background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(20px);display:flex;flex-direction:column;gap:14px;position:relative}
.price-pro{background:linear-gradient(180deg,rgba(168,85,247,.15),rgba(34,211,238,.08));border-color:rgba(34,211,238,.45);box-shadow:0 0 0 1px rgba(34,211,238,.15),0 28px 60px -16px rgba(168,85,247,.4)}
.price-tag{position:absolute;top:-12px;right:20px;background:linear-gradient(135deg,#22d3ee,#a855f7);color:#0a0e27;font-size:11px;font-weight:700;padding:6px 12px;border-radius:999px;letter-spacing:.05em;text-transform:uppercase}
.price h3{margin:0;font-size:18px;font-weight:700;color:#fff;font-family:'Space Grotesk'}
.price-num{font-size:38px;font-weight:700;font-family:'Space Grotesk';color:#fff;line-height:1}
.price-num span{font-size:14px;color:var(--muted);font-weight:500}
.price ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.price li{font-size:14px;color:#cbd5e1;padding-left:24px;position:relative}
.price li::before{content:'';position:absolute;left:0;top:5px;width:14px;height:14px;border-radius:50%;background:rgba(34,211,238,.15);background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2322d3ee' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>");background-size:10px 10px;background-position:center;background-repeat:no-repeat}

/* faq */
.faq{border-radius:20px;background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(20px);overflow:hidden}
.faq-item{padding:18px 24px;border-bottom:1px solid var(--line);cursor:pointer}
.faq-item:last-child{border-bottom:0}
.faq-q{display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#fff;font-size:15px;font-family:'Space Grotesk'}
.faq-q::after{content:'+';color:var(--neon);font-size:22px;font-weight:400;transition:transform .2s}
.faq-item.open .faq-q::after{content:'−'}
.faq-a{color:var(--muted);font-size:14px;margin-top:10px;display:none;line-height:1.65}
.faq-item.open .faq-a{display:block}

/* cta */
.cta-section{padding:32px 0 100px}
.cta{position:relative;padding:60px 40px;border-radius:30px;text-align:center;background:linear-gradient(135deg,rgba(34,211,238,.12),rgba(168,85,247,.18));border:1px solid rgba(34,211,238,.3);overflow:hidden;backdrop-filter:blur(20px)}
.cta-glow{position:absolute;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(34,211,238,.4),transparent 60%);top:-300px;left:50%;transform:translateX(-50%);filter:blur(80px);pointer-events:none}
.cta h2{font-size:38px;margin:0 0 10px;font-weight:700;color:#fff;position:relative}
.cta p{margin:0 0 28px;color:var(--muted);font-size:16px;max-width:560px;margin-left:auto;margin-right:auto;position:relative}
.cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;position:relative}

/* footer */
.ftr{background:#06091c;color:#94a3b8;padding:56px 0 28px;font-size:14px;border-top:1px solid var(--line);position:relative;z-index:2}
.ftr-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:32px}
.ftr h4{color:#fff;margin:0 0 12px;font-family:'Space Grotesk';font-size:14px}
.ftr ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}
.ftr a:hover{color:var(--neon)}
.ftr-muted{color:#64748b;margin-top:12px;font-size:13.5px;max-width:340px}
.ftr-bottom{border-top:1px solid var(--line);margin-top:32px;padding-top:20px;color:#475569;font-size:12px}

/* modal */
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;z-index:100;padding:16px}
.modal[hidden]{display:none !important}
.modal-bg{position:absolute;inset:0;background:rgba(6,9,28,.75);backdrop-filter:blur(10px)}
.modal-card{position:relative;border-radius:24px;padding:34px 30px;max-width:460px;width:100%;background:rgba(13,20,55,.92);border:1px solid var(--line);box-shadow:0 30px 80px -20px rgba(0,0,0,.7)}
.modal-card.glass-dark{background:rgba(13,20,55,.92)}
.modal-card-lg{max-width:720px;max-height:80vh;overflow:auto}
.modal-close{position:absolute;top:12px;right:14px;background:none;border:0;font-size:28px;cursor:pointer;color:var(--muted);width:36px;height:36px;border-radius:8px;line-height:1}
.modal-close:hover{background:rgba(255,255,255,.06);color:#fff}
.modal-card h3{margin:0 0 8px;font-size:24px;font-weight:700;color:#fff}
.muted{color:var(--muted)}
.small{font-size:13.5px}
.hint{font-size:12px;color:var(--muted);text-align:center;margin-top:12px}
.hint a{color:var(--neon)}
.info-body h4{margin:16px 0 6px;color:#fff;font-family:'Space Grotesk';font-size:15px}
.info-body p{margin:0 0 8px;color:#cbd5e1;font-size:14px;line-height:1.6}

.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:rgba(13,20,55,.95);color:#fff;padding:12px 18px;border-radius:12px;z-index:200;font-size:14px;border:1px solid rgba(34,211,238,.3);backdrop-filter:blur(14px);box-shadow:0 12px 30px -8px rgba(0,0,0,.5)}

@media (max-width:980px){
  .hero-asym{grid-template-columns:1fr;gap:28px}
  .rail{flex-direction:row;border-radius:18px;padding:14px 18px;justify-content:space-between}
  .rail-pill,.rail-num span{writing-mode:initial;transform:none}
  .rail-line{width:1px;height:30px;background:linear-gradient(180deg,transparent,#22d3ee,transparent)}
  .hero-main h1{font-size:38px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .zz,.zz.reverse{grid-template-columns:1fr;gap:18px}
  .zz.reverse .zz-img{order:0}
  .steps,.reviews,.prices{grid-template-columns:1fr}
  .nav{display:none}
  .ftr-grid{grid-template-columns:1fr}
  .section{padding:56px 0}
  .section-head h2,.cta h2{font-size:28px}
  .subj{flex:0 0 170px}
}