/* AIStudyTools – "Learning Lab · Indigo & Sunshine" design system */
:root{
  --bg:#FAFAFF; --white:#FFFFFF; --ink:#1E1B4B; --muted:#4A4878; --faint:#6E6C94;
  --accent:#4F46E5; --accent-dk:#3730A3; --soft:#EEF0FF; --line:#C9CCF7; --border:#E4E5F5;
  --sun:#FEF3C7; --sun-fg:#854D0E; --sun-strong:#FBBF24;
  --sky:#E0F2FE; --sky-fg:#075985; --pink:#FCE7F3; --pink-fg:#9D174D; --mint:#DCFCE7; --mint-fg:#166534;
  --radius:20px; --shadow:0 18px 40px -22px rgba(30,27,75,.35);
  --font:'Outfit',ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--accent)}a:hover{color:var(--accent-dk)}
h1,h2,h3,h4{margin:0;line-height:1.1;letter-spacing:-.02em}
h1{font-size:clamp(40px,6vw,68px);font-weight:800}
h2{font-size:clamp(30px,4vw,44px);font-weight:800}
h3{font-size:21px;font-weight:700;letter-spacing:-.01em}
p{margin:0}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;z-index:100;background:#fff;padding:8px 12px;border-radius:8px}
:focus-visible{outline:3px solid var(--sun-strong);outline-offset:2px}

/* Header */
.hdr{position:sticky;top:0;z-index:50;background:rgba(250,250,255,.86);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid transparent;transition:border-color .2s}
.hdr.scrolled{border-bottom-color:var(--border)}
.hdr .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;height:76px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.logo-mark{width:36px;height:36px;border-radius:50%;background:var(--accent);position:relative;flex:none}
.logo-mark::after{content:"";position:absolute;right:-3px;top:-3px;width:14px;height:14px;border-radius:50%;background:var(--sun-strong);border:3px solid var(--bg)}
.logo b{font-size:21px;font-weight:800;letter-spacing:-.01em}
.logo small{display:block;font-size:11px;color:var(--faint);font-weight:500;letter-spacing:.01em;margin-top:-2px}
.nav{display:flex;align-items:center;gap:4px}
.nav a{padding:9px 13px;border-radius:12px;text-decoration:none;color:var(--ink);font-weight:600;font-size:15.5px}
.nav a:hover{background:var(--soft);color:var(--accent-dk)}
.nav a.on{color:var(--accent);background:var(--soft)}
.hdr-cta{display:flex;align-items:center;gap:10px}
.menu-btn{display:none;width:46px;height:46px;border-radius:12px;border:1px solid var(--border);background:#fff;cursor:pointer;align-items:center;justify-content:center}
@media (max-width:1300px){
  .nav{position:fixed;inset:76px 0 auto 0;background:#fff;flex-direction:column;align-items:stretch;padding:12px 16px 20px;border-bottom:1px solid var(--border);box-shadow:var(--shadow);display:none}
  .nav.open{display:flex}
  .nav a{padding:14px 12px;font-size:17px}
  .menu-btn{display:inline-flex}
  .hdr-cta .btn{display:none}
}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 24px;border-radius:16px;font-weight:700;font-size:16.5px;text-decoration:none;border:0;cursor:pointer;font-family:inherit;transition:transform .15s,box-shadow .15s,background .15s;min-height:48px}
.btn:hover{transform:translateY(-2px)}
.btn-ink{background:var(--ink);color:#fff}.btn-ink:hover{color:#fff;box-shadow:var(--shadow)}
.btn-accent{background:var(--accent);color:#fff}.btn-accent:hover{color:#fff;background:var(--accent-dk)}
.btn-soft{background:var(--soft);color:var(--accent-dk)}.btn-soft:hover{color:var(--accent-dk);background:#E2E5FF}
.btn-sun{background:var(--sun-strong);color:var(--ink)}.btn-sun:hover{color:var(--ink)}
.btn-sm{padding:10px 18px;font-size:15px;min-height:44px;border-radius:14px}

/* Tags & chips */
.tag{display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:999px;background:var(--sun);color:var(--sun-fg);font-weight:700;font-size:14px}
.tag.indigo{background:var(--soft);color:var(--accent-dk)}
.tag.sky{background:var(--sky);color:var(--sky-fg)}
.chip{display:inline-flex;align-items:center;padding:11px 17px;border-radius:16px;font-weight:700;font-size:15.5px;box-shadow:0 8px 20px -14px rgba(30,27,75,.4)}
.c-indigo{background:var(--soft);color:var(--accent-dk)}.c-sun{background:var(--sun);color:var(--sun-fg)}.c-sky{background:var(--sky);color:var(--sky-fg)}.c-pink{background:var(--pink);color:var(--pink-fg)}.c-mint{background:var(--mint);color:var(--mint-fg)}

/* Sections */
section{padding:88px 0}
.sec-head{max-width:720px;margin:0 auto 48px;text-align:center;display:flex;flex-direction:column;gap:14px;align-items:center}
.sec-head p{color:var(--muted);font-size:19px}
.lead{color:var(--muted);font-size:20px;line-height:1.55}
.white{background:#fff}
.tint{background:var(--soft)}

/* Hero */
.hero{padding:56px 0 72px}
.hero .wrap{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.hero-copy{display:flex;flex-direction:column;gap:22px;align-items:flex-start}
.hero h1 .hl{color:var(--accent);position:relative;white-space:nowrap}
.hero h1 .hl::after{content:"";position:absolute;left:0;right:0;bottom:4px;height:12px;background:var(--sun-strong);opacity:.55;z-index:-1;border-radius:4px}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
@media (max-width:900px){.hero .wrap{grid-template-columns:1fr}.hero{padding-top:28px}}

/* Mind map */
.mindmap{position:relative;aspect-ratio:1/1;max-width:540px;width:100%;margin:0 auto}
.mindmap svg{position:absolute;inset:0;width:100%;height:100%}
.mindmap .center{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);background:var(--ink);color:#fff;padding:20px 26px;border-radius:24px;font-weight:800;font-size:19px;text-align:center;box-shadow:0 18px 36px -14px rgba(30,27,75,.55);min-width:170px}
.mindmap .chip{position:absolute;white-space:nowrap;animation:float 6s ease-in-out infinite}
.mindmap .chip:nth-of-type(2n){animation-delay:-3s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@media (prefers-reduced-motion:reduce){.mindmap .chip{animation:none}html{scroll-behavior:auto}}
@media (max-width:560px){.mindmap .chip{font-size:13px;padding:8px 11px}.mindmap .center{font-size:16px;min-width:130px;padding:14px 16px}}

/* Cards */
.grid{display:grid;gap:20px}
.grid>*{min-width:0}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:980px){.g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{background:#fff;border:2px solid var(--border);border-radius:var(--radius);padding:28px;display:flex;flex-direction:column;gap:12px;transition:transform .2s,border-color .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);border-color:var(--line);box-shadow:var(--shadow)}
.card p{color:var(--muted);font-size:16px}
.ico{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;flex:none}
.ico svg{width:26px;height:26px}
.i-indigo{background:var(--soft);color:var(--accent)}.i-sun{background:var(--sun);color:var(--sun-fg)}.i-sky{background:var(--sky);color:var(--sky-fg)}.i-pink{background:var(--pink);color:var(--pink-fg)}.i-mint{background:var(--mint);color:var(--mint-fg)}

/* Product cards (home) */
.prod{border-radius:28px;padding:34px;display:flex;flex-direction:column;gap:16px;position:relative;overflow:hidden;text-decoration:none;color:var(--ink);transition:transform .2s,box-shadow .2s}
.prod:hover{transform:translateY(-6px);box-shadow:var(--shadow);color:var(--ink)}
.prod.p-learn{background:var(--soft)}.prod.p-health{background:var(--sky)}.prod.p-skill{background:var(--sun)}.prod.p-course{background:var(--pink)}
.prod .kicker{font-weight:700;font-size:14px;letter-spacing:.06em;text-transform:uppercase;opacity:.75}
.prod h3{font-size:30px;font-weight:800}
.prod ul{margin:4px 0 0;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:8px}
.prod li{background:rgba(255,255,255,.75);border-radius:999px;padding:6px 12px;font-size:14px;font-weight:600}
.prod .go{margin-top:auto;font-weight:800;display:inline-flex;align-items:center;gap:6px}

/* Stats */
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.stat{background:#fff;border:2px solid var(--border);border-radius:var(--radius);padding:22px;text-align:center}
.stat b{display:block;font-size:36px;font-weight:800;color:var(--accent);letter-spacing:-.02em}
.stat span{color:var(--muted);font-size:15px}
@media (max-width:760px){.stats{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* Checklist */
.checks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 24px;list-style:none;padding:0;margin:0}
.checks li{display:flex;gap:10px;align-items:flex-start;font-weight:600}
.checks li::before{content:"";flex:none;width:22px;height:22px;margin-top:2px;border-radius:50%;background:var(--sun-strong) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231E1B4B' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 12.5l4 4 8-9'/%3E%3C/svg%3E") center/14px no-repeat}
@media (max-width:640px){.checks{grid-template-columns:1fr}}

/* Split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
@media (max-width:900px){.split{grid-template-columns:1fr}}

/* Steps */
.steps{list-style:none;padding:0;margin:0;display:grid;gap:14px;counter-reset:s}
.steps li{display:flex;gap:16px;align-items:flex-start;background:#fff;border:2px solid var(--border);border-radius:18px;padding:16px 18px}
.steps li::before{counter-increment:s;content:counter(s);flex:none;width:36px;height:36px;border-radius:50%;background:var(--accent);color:#fff;font-weight:800;display:grid;place-items:center}
.steps b{display:block}.steps span{color:var(--muted);font-size:15.5px}

/* CTA band */
.cta{background:var(--ink);color:#fff;border-radius:32px;padding:56px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;background:var(--sun-strong);opacity:.9}
.cta::after{content:"";position:absolute;right:120px;bottom:-90px;width:180px;height:180px;border-radius:50%;background:var(--accent)}
.cta>*{position:relative;z-index:1}
.cta h2{color:#fff;max-width:640px}
.cta p{color:#D6D5F0;margin-top:10px;max-width:600px}
@media (max-width:640px){.cta{padding:36px 24px}}

/* Note / disclaimer */
.note{background:var(--sun);color:var(--sun-fg);border-radius:18px;padding:20px 24px;font-size:15.5px}
.note b{color:#5C3507}

/* Media */
.media{position:relative;border-radius:24px;overflow:hidden;background:#1E1B4B;box-shadow:var(--shadow);cursor:pointer}
.media video{display:block;width:100%;height:auto}
.media .play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);background:#fff;color:var(--ink);font-weight:800;padding:12px 20px;border-radius:999px;display:flex;gap:10px;align-items:center;box-shadow:0 10px 30px rgba(0,0,0,.25)}
.modal{position:fixed;inset:0;background:rgba(14,12,40,.82);display:none;align-items:center;justify-content:center;z-index:200;padding:16px}
.modal.on{display:flex}
.modal video{width:min(1100px,100%);max-height:88vh;border-radius:16px;background:#000}
.modal button{position:absolute;top:16px;right:18px;width:46px;height:46px;border-radius:50%;border:0;background:#fff;font-size:24px;cursor:pointer}

/* Forms */
.form{background:#fff;border:2px solid var(--border);border-radius:24px;padding:32px;display:grid;gap:18px}
.field{display:grid;gap:7px}
.field label{font-weight:700;font-size:15px}
.field input,.field select,.field textarea{font:inherit;font-size:16px;padding:13px 14px;border:2px solid var(--border);border-radius:14px;background:#fff;color:var(--ink);outline:none;transition:border-color .15s}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--accent)}
.field textarea{min-height:130px;resize:vertical}
.field input,.field select,.field textarea{width:100%;min-width:0}
.field{min-width:0}
.row2{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px}
@media (max-width:640px){.row2{grid-template-columns:minmax(0,1fr)}}
.status{font-weight:700;font-size:15px}
.status.ok{color:#166534}.status.err{color:#B42318}

/* Contact cards */
.ccard{display:flex;gap:16px;align-items:center;text-decoration:none;color:var(--ink);background:#fff;border:2px solid var(--border);border-radius:20px;padding:20px;transition:transform .15s,border-color .15s}
.ccard:hover{transform:translateY(-3px);border-color:var(--accent);color:var(--ink)}
.ccard>span:last-child{min-width:0}
.ccard small{display:block;color:var(--muted);font-size:14px}
.ccard .v{display:block;font-weight:700;color:var(--accent);word-break:break-all}

/* Footer */
.ftr{background:var(--ink);color:#C9C8EA;padding:56px 0 28px;margin-top:40px}
.ftr .cols{display:grid;grid-template-columns:1.6fr 1fr 1.5fr 1.2fr;gap:32px}
.ftr h4{color:#fff;font-size:15px;letter-spacing:.06em;text-transform:uppercase;margin-bottom:12px}
.ftr a{color:#C9C8EA;text-decoration:none;display:block;padding:4px 0}
.ftr a:hover{color:#fff}
.ftr .logo{color:#fff}.ftr .logo-mark::after{border-color:var(--ink)}
.ftr .copy{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:20px;font-size:14px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
@media (max-width:860px){.ftr .cols{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.ftr .cols{grid-template-columns:1fr}}
.ftr a,.ftr p{overflow-wrap:anywhere}

/* Reveal on scroll */
.rv{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}}

/* WhatsApp float */
.wa{position:fixed;right:20px;bottom:20px;z-index:90;display:flex;align-items:center;gap:10px;text-decoration:none}
.wa .wa-btn{width:58px;height:58px;border-radius:50%;background:#25D366;display:grid;place-items:center;box-shadow:0 10px 25px -6px rgba(0,0,0,.35);transition:transform .15s}
.wa:hover .wa-btn{transform:scale(1.07)}
.wa .wa-label{background:#fff;color:#111827;font-size:14px;font-weight:700;padding:9px 14px;border-radius:999px;box-shadow:0 8px 22px -8px rgba(0,0,0,.3)}
@media (max-width:640px){.wa .wa-label{display:none}.wa{right:14px;bottom:14px}}

/* LearnX hook video */
.hook{padding:40px 0 8px}
.hook-head{display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center;margin-bottom:22px}
.hook-video{position:relative;max-width:980px;margin:0 auto;border-radius:28px;overflow:hidden;background:var(--ink);box-shadow:var(--shadow);aspect-ratio:16/9}
.hook-video video{display:block;width:100%;height:100%;object-fit:cover}
.hook-sound{position:absolute;right:16px;bottom:16px;border:0;border-radius:999px;background:#fff;color:var(--ink);font:inherit;font-weight:700;font-size:15px;padding:10px 16px;cursor:pointer;box-shadow:0 8px 22px -8px rgba(0,0,0,.35)}
.hook-sound[hidden]{display:none}

/* Side "Get a free demo" tab + form */
.demo-tab{position:fixed;right:0;top:50%;transform:translateY(-50%);z-index:95;writing-mode:vertical-rl;background:var(--accent);color:#fff;border:0;border-radius:14px 0 0 14px;padding:20px 12px;font:inherit;font-weight:800;font-size:16px;letter-spacing:.02em;cursor:pointer;box-shadow:0 10px 28px -10px rgba(30,27,75,.55);display:flex;align-items:center;gap:8px;transition:padding .15s,background .15s}
.demo-tab:hover{background:var(--accent-dk);padding-right:16px}
.demo-tab .dot{width:10px;height:10px;border-radius:50%;background:var(--sun-strong)}
@media (max-width:640px){.demo-tab{font-size:13px;padding:14px 9px}}
.dmodal{position:fixed;inset:0;z-index:210;background:rgba(14,12,40,.62);display:none;align-items:center;justify-content:center;padding:16px}
.dmodal.on{display:flex}
.dmodal .panel{position:relative;width:min(560px,100%);max-height:calc(100vh - 32px);overflow:auto;background:#fff;border-radius:26px;padding:30px;box-shadow:0 30px 60px -20px rgba(0,0,0,.45)}
.dmodal .panel h2{font-size:28px}
.dmodal .panel .sub{color:var(--muted);margin:6px 0 18px;font-size:16px}
.dmodal .x{position:absolute;right:14px;top:14px;width:42px;height:42px;border-radius:50%;border:0;background:var(--soft);color:var(--ink);font-size:22px;cursor:pointer}
.dmodal .form{border:0;padding:0;gap:14px}
@media (max-width:560px){.dmodal .panel{padding:24px 20px}}
.nav a,.hdr-cta .btn{white-space:nowrap}
.hook-sound{right:auto;left:16px}
@media (max-width:1540px){.nav a{padding:9px 8px;font-size:15px}.logo small{display:none}}
@media (max-width:560px){.hero h1 .hl{white-space:normal}}
/* Accordion (LearnX offerings) */
.acc{display:grid;gap:14px}
.acc-item{background:#fff;border:2px solid var(--border);border-radius:20px;overflow:hidden;transition:border-color .2s}
.acc-item[open]{border-color:var(--line);box-shadow:var(--shadow)}
.acc-item summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:16px;padding:18px 22px;font-weight:800;font-size:22px}
.acc-item summary::-webkit-details-marker{display:none}
.acc-item summary::after{content:"";margin-left:auto;width:12px;height:12px;border-right:3px solid var(--accent);border-bottom:3px solid var(--accent);transform:rotate(45deg);transition:transform .2s;flex:none}
.acc-item[open] summary::after{transform:rotate(-135deg)}
.acc-item summary .ico{width:46px;height:46px;border-radius:14px}
.acc-body{padding:0 22px 24px 84px;display:flex;flex-direction:column;gap:14px}
.acc-body p{color:var(--muted)}
@media (max-width:560px){.acc-body{padding:0 18px 20px}.acc-item summary{font-size:19px;padding:16px 18px}}
.btn svg{width:20px;height:20px;flex:none}

/* Tool and practice cards */
.card.tool{text-decoration:none;color:var(--ink)}
.card.tool:hover{color:var(--ink)}
.card.tool .go{margin-top:auto;font-weight:800;color:var(--accent);display:inline-flex;align-items:center;gap:6px}

/* Branching simulation */
.sim-box{background:#fff;border:2px solid var(--border);border-radius:var(--radius);padding:30px;display:flex;flex-direction:column;gap:14px}
.sim-box h2{font-size:22px;color:var(--accent-dk)}
.sim-box p{font-size:18px}
.sim-choices{display:grid;gap:10px;margin-top:6px}
.sim-choices button{font:inherit;font-weight:600;text-align:left;padding:14px 18px;border-radius:14px;border:2px solid var(--line);background:var(--soft);color:var(--ink);cursor:pointer;transition:border-color .15s,background .15s,transform .15s}
.sim-choices button:hover{border-color:var(--accent);background:#fff;transform:translateY(-1px)}

/* Newsletter */
.card.issue{text-decoration:none;color:var(--ink);gap:8px}
.card.issue:hover{color:var(--ink)}
.card.issue .date{font-size:14px;font-weight:700;color:var(--faint);text-transform:uppercase;letter-spacing:.05em}
.prose{font-size:18px;line-height:1.75;max-width:68ch}
.prose>*+*{margin-top:1.1em}
.prose h2{font-size:28px;margin-top:1.8em}
.prose h3{font-size:22px;margin-top:1.5em}
.prose ul,.prose ol{padding-left:1.3em}
.prose li+li{margin-top:.4em}
.prose blockquote{margin-left:0;padding:4px 0 4px 20px;border-left:4px solid var(--sun-strong);color:var(--muted)}
.prose code{background:var(--soft);padding:2px 6px;border-radius:6px;font-size:.9em}
.prose table{border-collapse:collapse;display:block;overflow-x:auto}
.prose th,.prose td{border:1px solid var(--border);padding:8px 12px;text-align:left}

/* Free-tools registration */
.gate .panel{text-align:left}
.gate .gate-points{list-style:none;padding:0;margin:0 0 18px;display:grid;gap:8px}
.gate .gate-points li{display:flex;gap:10px;align-items:center;font-weight:600}
.gate .gate-points li span{flex:none;background:var(--sun);color:var(--sun-fg);font-weight:800;border-radius:999px;padding:3px 10px;font-size:13px}