/* ===== NeuroTutor — Aurora Glass (light) ===== */
*{box-sizing:border-box}
html,body{margin:0;padding:0}
:root{
  --ink:#0f172a;
  --muted:#64748b;
  --line:rgba(15,23,42,.08);
  --glass:rgba(255,255,255,.55);
  --glass-strong:rgba(255,255,255,.78);
  --accent:#6366f1;
  --accent2:#ec4899;
}
body{font-family:'Manrope',system-ui,Segoe UI,Roboto,Arial,sans-serif;color:var(--ink);background:#f4f6ff;line-height:1.55;-webkit-font-smoothing:antialiased;overflow-x:hidden;min-height:100vh}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px;position:relative;z-index:1}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit}

/* aurora background */
.aurora{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none}
.blob{position:absolute;border-radius:50%;filter:blur(80px);opacity:.55}
.blob.b1{width:520px;height:520px;background:#a5b4fc;top:-120px;left:-100px}
.blob.b2{width:480px;height:480px;background:#fbcfe8;top:160px;right:-120px}
.blob.b3{width:440px;height:440px;background:#bae6fd;bottom:-100px;left:30%}
.blob.b4{width:380px;height:380px;background:#fde68a;top:50%;left:60%;opacity:.4}

/* glass primitive */
.glass{background:var(--glass);backdrop-filter:blur(22px) saturate(160%);-webkit-backdrop-filter:blur(22px) saturate(160%);border:1px solid rgba(255,255,255,.6);box-shadow:0 12px 40px -12px rgba(15,23,42,.18),inset 0 1px 0 rgba(255,255,255,.7)}

/* header */
.hdr{position:sticky;top:12px;margin:12px auto 0;border-radius:18px;z-index:50;width:calc(100% - 24px);max-width:1200px;left:0;right:0}
.hdr-row{display:flex;align-items:center;gap:24px;padding:12px 18px}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--ink)}
.logo b{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.logo-mark{width:36px;height:36px;border-radius:11px;background:linear-gradient(135deg,#6366f1,#a855f7);color:#fff;display:inline-flex;align-items:center;justify-content:center;box-shadow:0 8px 20px -6px rgba(99,102,241,.55)}
.nav{display:flex;gap:24px;margin-left:auto;font-weight:600;color:#475569;font-size:14px}
.nav a{position:relative;padding:6px 4px}
.nav a:hover{color:var(--accent)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:12px 20px;font-weight:700;font-size:15px;cursor:pointer;transition:transform .15s, box-shadow .2s, background .15s;letter-spacing:-.01em}
.btn-sm{padding:9px 14px;font-size:13.5px;border-radius:10px}
.btn-lg{padding:14px 24px;font-size:16px;border-radius:14px}
.btn-block{width:100%}
.btn-primary{background:linear-gradient(135deg,#6366f1,#a855f7);color:#fff;box-shadow:0 12px 28px -8px rgba(99,102,241,.55)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 16px 36px -8px rgba(99,102,241,.65)}
.btn-glass{background:rgba(255,255,255,.7);color:var(--ink);backdrop-filter:blur(10px);border:1px solid rgba(15,23,42,.08)}
.btn-glass:hover{background:#fff;transform:translateY(-1px)}
.btn-max{background:#0f172a;color:#fff}
.btn-max:hover{background:#1e293b}
.max-ico{width:18px;height:18px;background:#fff;border-radius:5px;padding:2px;object-fit:contain}

/* hero */
.hero{padding:64px 0 48px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--accent);background:rgba(99,102,241,.1);padding:6px 12px;border-radius:999px;margin-bottom:20px;text-transform:uppercase;letter-spacing:.05em}
.kicker .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px rgba(99,102,241,.2)}
.hero h1{font-size:54px;line-height:1.05;margin:0 0 18px;font-weight:800;letter-spacing:-.025em}
.grad{background:linear-gradient(90deg,#6366f1,#a855f7,#ec4899);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:18px;color:var(--muted);margin:0 0 28px;max-width:520px;line-height:1.55}
.hero-cta{display:flex;gap:12px;margin-bottom:36px;flex-wrap:wrap}
.hero-stats{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.hero-stats div:not(.sep){display:flex;flex-direction:column}
.hero-stats b{font-size:22px;color:var(--ink);font-weight:800}
.hero-stats span{font-size:13px;color:var(--muted)}
.hero-stats .sep{width:1px;height:30px;background:var(--line)}

/* hero card */
.hero-card{padding:18px;border-radius:24px}
.card-head{display:flex;align-items:center;gap:12px;padding:0 6px 14px;border-bottom:1px solid var(--line)}
.card-avatar{width:40px;height:40px;border-radius:12px;overflow:hidden;background:linear-gradient(135deg,#6366f1,#a855f7);flex:none}
.card-avatar img{width:100%;height:100%;object-fit:cover;mix-blend-mode:luminosity;opacity:.85}
.card-name{font-weight:700;font-size:14px}
.card-meta{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:6px;margin-top:2px}
.online{width:8px;height:8px;border-radius:50%;background:#22c55e;box-shadow:0 0 0 3px rgba(34,197,94,.2)}
.card-action{margin-left:auto;width:36px;height:36px;border:0;border-radius:10px;background:rgba(99,102,241,.1);color:var(--accent);cursor:pointer;display:inline-flex;align-items:center;justify-content:center}
.card-action:hover{background:rgba(99,102,241,.2)}

.chat{display:flex;flex-direction:column;gap:10px;padding:14px 6px;max-height:340px;overflow:hidden}
.msg{padding:10px 14px;border-radius:14px;font-size:13.5px;line-height:1.5;max-width:88%}
.msg-user{background:linear-gradient(135deg,#6366f1,#a855f7);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}
.msg-ai{background:rgba(255,255,255,.7);border:1px solid var(--line);align-self:flex-start;border-bottom-left-radius:4px}
.msg-ai p{margin:0 0 6px}.msg-ai p:last-child{margin-bottom:0}
.formula{font-family:'Manrope',monospace;font-weight:700;background:#eef2ff;color:var(--accent);padding:6px 10px;border-radius:8px;display:inline-block;margin:4px 0;font-size:14px}
.msg-photo{display:flex;align-items:center;gap:10px;padding:8px 10px}
.msg-photo img{width:60px;height:42px;object-fit:cover;border-radius:8px}
.typing{display:inline-flex;gap:4px;align-items:center;width:fit-content}
.typing span{width:6px;height:6px;border-radius:50%;background:var(--accent);opacity:.4;animation:tpd 1.2s infinite}
.typing span:nth-child(2){animation-delay:.15s}
.typing span:nth-child(3){animation-delay:.3s}
@keyframes tpd{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}

.chat-input{display:flex;align-items:center;gap:6px;padding:6px;border-radius:14px;background:rgba(255,255,255,.7) !important}
.chat-input input{flex:1;background:transparent;border:0;padding:8px 10px;font-size:14px;outline:none;font-family:inherit;color:var(--ink)}
.ci-btn,.ci-send{width:36px;height:36px;border:0;border-radius:10px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center}
.ci-btn{background:rgba(15,23,42,.06);color:var(--muted)}
.ci-btn:hover{background:rgba(15,23,42,.12);color:var(--ink)}
.ci-send{background:linear-gradient(135deg,#6366f1,#a855f7);color:#fff}

/* sections */
.section{padding:80px 0;position:relative}
.section-head{margin-bottom:40px}
.section-head.center{text-align:center}
.section-head.center .kicker{margin:0 auto 14px}
.section-head h2{font-size:40px;font-weight:800;margin:0;letter-spacing:-.02em;line-height:1.15}

/* features */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat{text-align:left;padding:0;border-radius:22px;cursor:pointer;overflow:hidden;border:1px solid rgba(255,255,255,.6);transition:transform .2s, box-shadow .2s}
.feat:hover{transform:translateY(-6px);box-shadow:0 28px 50px -16px rgba(99,102,241,.3)}
.feat-img{height:140px;background-size:cover;background-position:center;position:relative}
.feat-img::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent,rgba(255,255,255,.65))}
.feat-body{padding:18px 22px 22px;position:relative}
.feat-ico{width:44px;height:44px;border-radius:12px;display:inline-flex;align-items:center;justify-content:center;margin-top:-32px;position:relative;z-index:1;box-shadow:0 8px 22px -6px rgba(15,23,42,.25);margin-bottom:12px}
.feat h3{margin:0 0 6px;font-size:18px;font-weight:800}
.feat p{margin:0 0 14px;color:var(--muted);font-size:14px}
.feat-cta{font-weight:700;color:var(--accent);font-size:14px;display:inline-flex;align-items:center;gap:6px}
.feat-cta span{transition:transform .15s}
.feat:hover .feat-cta span{transform:translateX(4px)}

/* subjects */
.subj-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.subj{padding:18px;border-radius:18px;display:flex;align-items:center;gap:12px;cursor:pointer;transition:transform .15s;text-align:left}
.subj:hover{transform:translateY(-3px)}
.subj-ico{width:46px;height:46px;border-radius:13px;display:flex;align-items:center;justify-content:center;color:#fff;flex:none;font-size:20px;font-weight:800;box-shadow:0 8px 18px -6px rgba(15,23,42,.25)}
.subj-name{font-weight:700;font-size:15px;color:var(--ink)}
.subj-meta{font-size:12px;color:var(--muted);margin-top:2px}

/* how */
.how-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.how{padding:28px 24px;border-radius:22px;display:flex;flex-direction:column;gap:8px}
.how-num{font-size:13px;font-weight:800;color:var(--accent);letter-spacing:.1em}
.how h3{margin:0;font-size:20px;font-weight:800}
.how p{margin:0 0 14px;color:var(--muted);font-size:14px}
.how .btn{align-self:flex-start;margin-top:auto}

/* reviews */
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.review{padding:24px;border-radius:20px;background:rgba(255,255,255,.55);backdrop-filter:blur(22px);border:1px solid rgba(255,255,255,.6)}
.review-stars{color:#f59e0b;margin-bottom:10px;font-size:14px}
.review-text{font-size:14px;color:#334155;margin:0 0 16px;line-height:1.55}
.review-author{display:flex;align-items:center;gap:12px}
.review-avatar{width:42px;height:42px;border-radius:12px;overflow:hidden;background:linear-gradient(135deg,#6366f1,#ec4899);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;flex:none}
.review-avatar img{width:100%;height:100%;object-fit:cover}
.review-name{font-weight:800;font-size:14px}
.review-meta{font-size:12px;color:var(--muted)}

/* prices */
.prices{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;align-items:stretch}
.price{padding:28px;border-radius:22px;display:flex;flex-direction:column;gap:14px;position:relative}
.price-pro{background:linear-gradient(180deg,rgba(255,255,255,.85),rgba(238,242,255,.85)) !important;border:1px solid rgba(99,102,241,.4) !important;box-shadow:0 28px 60px -20px rgba(99,102,241,.45) !important}
.price-tag{position:absolute;top:-12px;right:18px;background:linear-gradient(135deg,#6366f1,#ec4899);color:#fff;font-size:11px;font-weight:800;padding:5px 11px;border-radius:999px;letter-spacing:.05em;text-transform:uppercase}
.price h3{margin:0;font-size:18px;font-weight:800}
.price-num{font-size:36px;font-weight:800;color:var(--ink)}
.price-num span{font-size:14px;color:var(--muted);font-weight:600}
.price ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}
.price li{font-size:14px;color:#475569;padding-left:24px;position:relative}
.price li::before{content:'';position:absolute;left:0;top:6px;width:14px;height:14px;border-radius:50%;background:linear-gradient(135deg,#6366f1,#a855f7);background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' 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{padding:8px;border-radius:22px}
.faq-item{padding:16px 22px;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:700;color:var(--ink);font-size:15px}
.faq-q::after{content:'+';color:var(--accent);font-weight:700;font-size:20px;transition:transform .2s}
.faq-item.open .faq-q::after{content:'−'}
.faq-a{color:var(--muted);font-size:14px;margin-top:8px;display:none;line-height:1.6}
.faq-item.open .faq-a{display:block}

/* cta */
.cta-section{padding:60px 0 100px}
.cta{padding:48px 40px;border-radius:28px;text-align:center;background:linear-gradient(135deg,rgba(165,180,252,.45),rgba(251,207,232,.45)) !important}
.cta h2{font-size:34px;margin:0 0 8px;font-weight:800;letter-spacing:-.02em}
.cta p{margin:0 0 24px;color:var(--muted);font-size:16px;max-width:520px;margin-left:auto;margin-right:auto}
.cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* footer */
.ftr{background:rgba(15,23,42,.96);color:#cbd5e1;padding:48px 0 24px;font-size:14px;backdrop-filter:blur(10px);position:relative;z-index:1}
.ftr-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.ftr .logo{color:#fff}
.ftr .logo-mark{background:linear-gradient(135deg,#6366f1,#ec4899);color:#fff}
.ftr h4{color:#fff;margin:0 0 10px}
.ftr ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:6px;color:#94a3b8}
.ftr a:hover{color:#fff}
.ftr-muted{color:#94a3b8;margin-top:10px}
.ftr-bottom{border-top:1px solid #1e293b;margin-top:28px;padding-top:18px;color:#64748b;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(15,23,42,.5);backdrop-filter:blur(8px)}
.modal-card{position:relative;border-radius:22px;padding:30px 28px;max-width:440px;width:100%;background:rgba(255,255,255,.92) !important}
.modal-card-lg{max-width:680px;max-height:80vh;overflow:auto}
.modal-close{position:absolute;top:10px;right:14px;background:none;border:0;font-size:26px;cursor:pointer;color:var(--muted);width:36px;height:36px;border-radius:8px}
.modal-close:hover{background:#f1f5f9;color:var(--ink)}
.modal-card h3{margin:0 0 8px;font-size:22px;font-weight:800}
.muted{color:var(--muted)}
.small{font-size:13px}
.hint{font-size:12px;color:var(--muted);text-align:center;margin-top:10px}
.hint a{color:var(--accent)}
.info-body h4{margin:14px 0 4px;color:var(--ink)}
.info-body p{margin:0 0 8px;color:#475569;font-size:14px}

.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:#0f172a;color:#fff;padding:10px 16px;border-radius:10px;z-index:200;font-size:14px}

@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero h1{font-size:38px}
  .feat-grid,.how-grid,.reviews,.prices{grid-template-columns:1fr}
  .subj-grid{grid-template-columns:repeat(2,1fr)}
  .nav{display:none}
  .ftr-grid{grid-template-columns:1fr}
  .section{padding:56px 0}
  .section-head h2{font-size:28px}
}