/* ArkSpec Study Engine website styles. Fonts are self-hosted (see fonts/). */
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:500;font-display:swap;src:url(fonts/chakra-petch-latin-500-normal.woff2) format("woff2")}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:600;font-display:swap;src:url(fonts/chakra-petch-latin-600-normal.woff2) format("woff2")}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:700;font-display:swap;src:url(fonts/chakra-petch-latin-700-normal.woff2) format("woff2")}
@font-face{font-family:"Figtree";font-style:normal;font-weight:400;font-display:swap;src:url(fonts/figtree-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"Figtree";font-style:normal;font-weight:500;font-display:swap;src:url(fonts/figtree-latin-500-normal.woff2) format("woff2")}
@font-face{font-family:"Figtree";font-style:normal;font-weight:600;font-display:swap;src:url(fonts/figtree-latin-600-normal.woff2) format("woff2")}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:500;font-display:swap;src:url(fonts/jetbrains-mono-latin-500-normal.woff2) format("woff2")}
:root{--bg:#050b12;--panel:#0a1622;--line:#1d5468;--text:#d8f3ff;--muted:#7fa3b3;--accent:#33e1ff;--c2:#ffb547;--good:#3ee0a0;--ink:#061017;
  --grid:color-mix(in srgb,var(--line) 20%,transparent);--soft:color-mix(in srgb,var(--line) 60%,transparent);color-scheme:dark}
@media (prefers-color-scheme: light){:root:not([data-theme="dark"]){--bg:#f3f6f9;--panel:#fff;--line:#c6d5e0;--text:#0f2230;--muted:#557080;--accent:#0a7fc0;--c2:#b86e00;--good:#138a5b;--ink:#fff;color-scheme:light}}
:root[data-theme="light"]{--bg:#f3f6f9;--panel:#fff;--line:#c6d5e0;--text:#0f2230;--muted:#557080;--accent:#0a7fc0;--c2:#b86e00;--good:#138a5b;--ink:#fff;color-scheme:light}
body{transition:background-color .35s,color .35s}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 "Figtree",system-ui,sans-serif;-webkit-font-smoothing:antialiased;
  background-image:radial-gradient(1000px 520px at 75% -10%,color-mix(in srgb,var(--accent) 12%,transparent),transparent 60%),linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:auto,44px 44px,44px 44px}
a{color:var(--accent)}
h1,h2,h3{font-family:"Chakra Petch",sans-serif;line-height:1.08;margin:0}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
nav{display:flex;align-items:center;justify-content:space-between;padding:18px 0;gap:12px}
.brand{display:flex;align-items:center;gap:10px;font-family:"Chakra Petch";font-weight:700;letter-spacing:.24em;font-size:19px;text-decoration:none;color:var(--text)}
.brand-ic{width:36px;height:36px;display:block;flex:none}
.brand-ic .tile{fill:var(--bg);stroke:var(--line);stroke-width:.6}
.brand-ic g{color:var(--accent);transition:color .35s}
.brand-ic .tile{transition:fill .35s}
.brand-ic .spark{animation:spark 2.8s ease-in-out infinite}
@keyframes spark{50%{opacity:.45}}
@media (prefers-reduced-motion: reduce){.brand-ic .spark{animation:none}}
.navlinks{display:flex;gap:18px;align-items:center;font-weight:600;font-size:.95rem}
.navlinks a{color:var(--muted);text-decoration:none}
.navlinks a:hover{color:var(--text)}
.btn{display:inline-flex;align-items:center;gap:10px;font-family:"Chakra Petch";font-weight:700;letter-spacing:.04em;padding:14px 22px;border-radius:6px;text-decoration:none;border:1px solid var(--line);color:var(--text);background:color-mix(in srgb,var(--panel) 85%,transparent)}
.btn.primary{background:var(--accent);color:var(--ink);border-color:var(--accent);box-shadow:0 0 30px -8px color-mix(in srgb,var(--accent) 70%,transparent)}
.btn.primary:hover{filter:brightness(1.08)}
.btn svg{width:20px;height:20px}
.hero{display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:center;padding:48px 0 30px}
.eyebrow{font-family:"JetBrains Mono";font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--accent)}
.hero h1{font-size:clamp(2.4rem,5.4vw,4.1rem);margin:14px 0 18px;letter-spacing:-.01em}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p.lead{font-size:1.15rem;color:var(--muted);max-width:52ch;margin:0 0 26px}
.cta{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.fine{font-size:.85rem;color:var(--muted);margin-top:12px}
.shot{border:1px solid var(--soft);border-radius:10px;overflow:hidden;box-shadow:0 30px 80px -30px rgba(0,0,0,.6),0 0 40px -18px color-mix(in srgb,var(--accent) 60%,transparent);position:relative;background:var(--panel)}
.shot img{display:block;width:100%;height:auto;transition:opacity .25s}
.shot img.swapping{opacity:.15}
.badges{display:flex;flex-wrap:wrap;gap:10px;margin:28px 0 0}
.badge{border:1px solid var(--soft);border-radius:999px;padding:6px 14px;font-size:.88rem;font-weight:600;background:color-mix(in srgb,var(--panel) 80%,transparent)}
.badge b{color:var(--good)}
section{padding:70px 0 10px}
section > .wrap > h2{font-size:clamp(1.8rem,3.4vw,2.6rem);margin-bottom:10px}
section > .wrap > p.sub{color:var(--muted);max-width:62ch;margin:0 0 34px;font-size:1.06rem}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{background:color-mix(in srgb,var(--panel) 92%,transparent);border:1px solid var(--soft);border-radius:8px;padding:22px;position:relative}
.card::before,.card::after{content:"";position:absolute;width:11px;height:11px;border:2px solid var(--accent);opacity:.8}
.card::before{top:-1px;left:-1px;border-right:0;border-bottom:0}.card::after{bottom:-1px;right:-1px;border-left:0;border-top:0}
.card .n{font-family:"JetBrains Mono";color:var(--accent);font-size:1.4rem}
.card h3{font-size:1.25rem;margin:8px 0 8px}
.card p{margin:0;color:var(--muted)}
.tools{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.tools .card h3{font-size:1.05rem;color:var(--accent);margin:0 0 10px;letter-spacing:.04em}
.tools ul{margin:0;padding-left:1.1rem;color:var(--text)}
.tools li{margin:4px 0}
.split{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center}
.list{list-style:none;padding:0;margin:0;display:grid;gap:14px}
.list li{display:grid;grid-template-columns:28px 1fr;gap:10px}
.list li svg{width:22px;height:22px;color:var(--good);margin-top:3px}
.list b{display:block}
.list span{color:var(--muted)}
.themes{display:grid;grid-template-columns:repeat(auto-fill,minmax(112px,1fr));gap:10px;margin-top:18px}
.sw{display:flex;flex-direction:column;gap:7px;padding:8px;border-radius:8px;border:1px solid var(--soft);background:color-mix(in srgb,var(--panel) 85%,transparent);color:var(--text);cursor:pointer;font:600 .82rem "Figtree",sans-serif;text-align:left;transition:border-color .15s,transform .15s}
.sw:hover{border-color:var(--accent);transform:translateY(-2px)}
.sw[aria-pressed="true"]{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent),0 0 18px -6px var(--accent)}
.sw .chipset{display:grid;grid-template-columns:2fr 1fr 1fr;height:30px;border-radius:4px;overflow:hidden;border:1px solid rgba(127,127,127,.25)}
.modes{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px;align-items:center}
.modes span{color:var(--muted);font-size:.9rem;margin-right:4px}
.mode{border:1px solid var(--soft);background:transparent;color:var(--text);border-radius:999px;padding:6px 14px;font:600 .88rem "Figtree",sans-serif;cursor:pointer}
.mode[aria-pressed="true"]{background:var(--accent);color:var(--ink);border-color:var(--accent)}
.tryhint{font-size:.88rem;color:var(--muted);margin-top:12px}
.reqs{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.reqs .card b{font-family:"Chakra Petch";font-size:1.15rem}
.reqs .card p{margin-top:6px}
details{border:1px solid var(--soft);border-radius:8px;background:color-mix(in srgb,var(--panel) 92%,transparent);margin-bottom:10px}
summary{cursor:pointer;padding:16px 18px;font-weight:600;font-size:1.04rem}
details p{margin:0;padding:0 18px 16px;color:var(--muted)}
.final{text-align:center;padding:80px 0}
.final h2{font-size:clamp(2rem,4vw,3rem);margin-bottom:14px}
footer{border-top:1px solid var(--soft);padding:26px 0 40px;color:var(--muted);font-size:.9rem}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
@media (max-width:900px){
  .hero,.split{grid-template-columns:1fr}
  .tools{grid-template-columns:1fr 1fr}
  .steps,.reqs{grid-template-columns:1fr}
  .navlinks a:not(.btn){display:none}
}
@media (max-width:520px){.tools{grid-template-columns:1fr}.wrap{padding:0 16px}.btn{padding:12px 16px}}
.sw .chipset i{display:block}
.hash{font-family:"JetBrains Mono",monospace;font-size:.82rem;word-break:break-all;background:color-mix(in srgb,var(--panel) 85%,transparent);border:1px solid var(--soft);border-radius:6px;padding:8px 10px;display:block;margin:8px 18px 0;color:var(--text)}
details code{font-family:"JetBrains Mono",monospace;font-size:.85rem}
.webnote{border:1px solid var(--accent);border-radius:8px;padding:16px 18px;margin:0 0 22px;background:color-mix(in srgb,var(--accent) 8%,var(--panel))}
.webnote b{font-family:"Chakra Petch";color:var(--accent);letter-spacing:.04em}
.webnote p{margin:6px 0 14px;color:var(--text)}
.only-phone{display:none}
@media (max-width:700px){.only-phone{display:block}.navlinks .only-phone{display:inline-flex}.only-desk{display:none}.webnote .btn{width:100%;justify-content:center}}
/* Brand lockup: "ArkSpec" over "Study Engine", like the app's sidebar. */
.brand-txt{display:flex;flex-direction:column;line-height:1.05}
.brand-txt .brand-name{letter-spacing:.14em;font-size:19px}
.brand-txt .brand-sub{font-family:"JetBrains Mono",ui-monospace,monospace;font-weight:400;font-size:11px;letter-spacing:.06em;color:var(--muted)}

/* 404 page */
.notfound{min-height:70vh;display:flex;flex-direction:column;justify-content:center;align-items:flex-start;gap:12px}

/* Plans */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;align-items:stretch}
.plan h3{font-size:1.2rem;color:var(--accent);margin:0}
.plan .price{font-family:"Chakra Petch";font-size:2.2rem;font-weight:700;color:var(--text);margin:6px 0 12px}
.plan .price small{font-size:.95rem;font-weight:600;color:var(--muted);margin-left:4px}
.plan ul{margin:0;padding-left:1.1rem}
.plan li{margin:6px 0}
.plan.best{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}
.plan .tag{position:absolute;top:-11px;right:16px;background:var(--accent);color:var(--bg);font-size:.75rem;font-weight:700;padding:3px 10px;border-radius:999px}
.tools .extra{margin-top:12px;font-size:.9rem}
.btn.soon{cursor:default;opacity:.85}
@media (max-width:900px){.plans{grid-template-columns:1fr}}

/* Account, pricing and legal pages */
.page{padding:28px 20px 70px}
.page.narrow{max-width:760px}
.page h1{font-size:clamp(1.9rem,4vw,2.5rem);margin:6px 0 12px}
.page h2{font-size:1.35rem;margin:36px 0 12px}
.page > .sub,.page p.sub{color:var(--muted);max-width:62ch;margin:0 0 30px;font-size:1.04rem}
.card.auth{max-width:480px;margin:10px auto}
.card.auth h1{font-size:1.8rem}
.field{display:block;margin:16px 0 0}
.field > span:first-child{display:block;font-weight:600;font-size:.92rem;margin-bottom:6px}
.field input{width:100%;font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--soft);border-radius:6px;padding:12px 14px}
.field input:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.pwrow{display:flex;gap:8px}
.pwrow input{flex:1;min-width:0}
.hint{color:var(--muted);font-size:.86rem;margin:6px 0 0}
.check{display:flex;gap:10px;align-items:flex-start;margin:14px 0 0;font-size:.93rem;cursor:pointer}
.check input{margin-top:4px;width:17px;height:17px;flex:none;accent-color:var(--accent)}
.turnstile{margin:16px 0 0;min-height:0}
.form-msg{margin:14px 0 0;padding:10px 12px;border-radius:6px;font-size:.93rem;border:1px solid var(--soft)}
.form-msg.bad{border-color:#e5484d;color:#ff8c8f;background:color-mix(in srgb,#e5484d 10%,transparent)}
:root[data-theme="light"] .form-msg.bad{color:#b4232a}
.form-msg.good{border-color:var(--good);color:var(--good)}
.btn.wide{width:100%;justify-content:center;margin-top:18px}
.btn.sm{padding:8px 14px;font-size:.85rem}
.btn.ghost{background:transparent}
.btn:disabled{opacity:.6;cursor:wait}
.row{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 0}
.notice{border:1px solid var(--c2);border-radius:8px;padding:12px 14px;margin:16px 0;background:color-mix(in srgb,var(--c2) 9%,transparent);font-size:.94rem}
.code-label{margin:18px 0 6px;font-weight:600}
.code{font-family:"JetBrains Mono",monospace;font-size:2rem;letter-spacing:.18em;margin:0;color:var(--accent)}
.acct-row{display:grid;grid-template-columns:130px 1fr;gap:12px;padding:10px 0;border-bottom:1px solid var(--soft);align-items:center}
.acct-row progress{display:block;width:100%;max-width:280px;margin-top:6px;accent-color:var(--accent)}
.muted{color:var(--muted)}
.small{font-size:.88rem}
.sessions{list-style:none;padding:0;margin:0}
.sess{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--soft)}
.sess b,.sess span{display:block}
.card.danger{border-color:color-mix(in srgb,#e5484d 60%,transparent)}
.danger-btn{margin-top:18px;background:#b4232a;border-color:#b4232a;color:#fff}
.legal h2{font-size:1.2rem;margin:30px 0 8px}
.legal p,.legal li{color:color-mix(in srgb,var(--text) 88%,var(--muted))}
.legal ul{padding-left:1.2rem}
.legal li{margin:6px 0}
.footlinks{display:flex;flex-wrap:wrap;gap:16px}
.footlinks a{color:var(--muted)}
.plan .btn{margin-top:18px;width:100%;justify-content:center}
.faq-mini{margin-top:40px}
[hidden]{display:none!important}
@media (max-width:520px){.acct-row{grid-template-columns:1fr;gap:2px}.page{padding:18px 16px 60px}.code{font-size:1.6rem}}