@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600;700&display=swap');

:root{
  --ink:#13151f; --ink-soft:#3a3f51; --muted:#6b7186; --line:#e8e8f0;
  --bg:#f5f5fa; --surface:#ffffff; --surface-2:#fbfbfe;
  --brand:#4f46e5; --brand-2:#7c5cfc; --brand-ink:#3b34c4;
  --hl:#ffc83d; --hl-soft:#fff0c2;           /* highlighter */
  --green:#15a163; --green-soft:#e2f6ec; --red:#e23b4e; --red-soft:#fde7ea;
  --amber-soft:#fff3d6; --warn:#b8860b;
  --shadow:0 1px 2px rgba(20,22,40,.05),0 8px 24px -12px rgba(20,22,40,.14);
  --shadow-lg:0 24px 60px -24px rgba(40,30,120,.35);
  --r:16px; --r-lg:22px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:Inter,system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;
  display:flex;flex-direction:column;min-height:100vh;-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:'Space Grotesk',Inter,sans-serif;line-height:1.15;margin:0 0 .4em;letter-spacing:-.01em}
a{color:var(--brand-ink);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.muted{color:var(--muted)} .small{font-size:13px} .center{text-align:center}
.hint{color:var(--muted);font-size:13px;margin:.4rem 0}
code{background:var(--surface-2);border:1px solid var(--line);border-radius:6px;padding:.08em .4em;font-size:.9em;font-family:ui-monospace,Menlo,monospace}
:focus-visible{outline:3px solid rgba(79,70,229,.45);outline-offset:2px;border-radius:8px}

/* ---------- layout ---------- */
.container{width:100%;max-width:1080px;margin:0 auto;padding:34px 20px 60px;flex:1}
.container.narrow{max-width:760px}
.lead{font-size:clamp(26px,4vw,34px)}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:30;background:rgba(245,245,250,.82);backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid var(--line)}
.nav-in{max-width:1080px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:10px}
.spacer{flex:1}
.brand{display:inline-flex;align-items:center;gap:8px;text-decoration:none}
.logo{font-family:'Space Grotesk';font-weight:700;font-size:20px;color:var(--ink);position:relative;padding:0 2px}
.logo:after{content:"";position:absolute;left:-1px;right:-1px;bottom:2px;height:8px;background:var(--hl);z-index:-1;border-radius:3px;transform:skewX(-12deg);opacity:.85}
.adm{font-size:12px;font-weight:700;color:var(--brand-ink);background:#eceaff;border-radius:999px;padding:3px 9px;margin-left:4px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;font-family:'Space Grotesk';font-weight:600;font-size:15px;
  padding:11px 18px;border-radius:12px;border:1px solid transparent;cursor:pointer;background:#eef0f6;color:var(--ink);transition:transform .12s,box-shadow .15s,background .15s;text-decoration:none}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 8px 20px -8px rgba(79,70,229,.6)}
.btn.ghost{background:var(--surface);border-color:var(--line);color:var(--ink)}
.btn.danger{background:var(--red-soft);color:#b21f30;border-color:#f6cdd3}
.btn.sm{padding:7px 12px;font-size:13.5px;border-radius:10px}
.btn.lg{padding:15px 26px;font-size:17px;border-radius:14px}
.btn.block{display:flex;width:100%;margin-top:8px}
.btn[disabled]{opacity:.5;cursor:not-allowed;transform:none}

/* ---------- credits pill ---------- */
.credits-pill{display:inline-flex;align-items:center;gap:7px;font-weight:700;font-size:14px;font-family:'Space Grotesk';
  background:var(--amber-soft);color:#8a6400;border:1px solid #ffe6a8;padding:7px 13px;border-radius:999px;text-decoration:none}
.credits-pill:hover{text-decoration:none;filter:brightness(.98)}
.credits-pill .dot{width:8px;height:8px;border-radius:50%;background:var(--hl);box-shadow:0 0 0 3px #ffe6a8}

/* ---------- hero ---------- */
.hero{background:radial-gradient(120% 120% at 80% -10%,#2a2470 0%,#15152e 45%,#0e0f22 100%);color:#fff;overflow:hidden;position:relative}
.hero:before{content:"";position:absolute;inset:0;background:
  radial-gradient(40% 60% at 12% 110%,rgba(124,92,252,.35),transparent 70%),
  radial-gradient(30% 50% at 95% 0%,rgba(255,200,61,.18),transparent 70%)}
.hero-in{position:relative;max-width:920px;margin:0 auto;padding:64px 20px 72px;text-align:center}
.badge{display:inline-block;font-size:13px;font-weight:600;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);color:#e9e7ff;padding:7px 14px;border-radius:999px;margin-bottom:20px}
.hero h1{font-size:clamp(30px,5.5vw,52px);font-weight:700;max-width:14ch;margin:0 auto .5em;background:linear-gradient(180deg,#fff,#d7d4ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:clamp(16px,2.2vw,19px);color:#c5c3e0;max-width:54ch;margin:0 auto 28px}
.search{display:flex;gap:8px;max-width:560px;margin:0 auto 22px;background:#fff;border-radius:16px;padding:7px;box-shadow:var(--shadow-lg)}
.search input{flex:1;border:none;background:transparent;font-size:16px;padding:12px 14px;color:var(--ink);outline:none}
.search .btn{border-radius:11px}
.cat-row{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.chip{display:inline-block;font-size:13.5px;font-weight:600;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);color:#dedcf5;padding:7px 13px;border-radius:999px;text-decoration:none}
.cat-row .chip:hover{text-decoration:none;background:rgba(255,255,255,.16)}
.cat-row .chip.on{background:var(--hl);border-color:var(--hl);color:#3a2c00}

/* chips on light bg (cards) */
.xcard-top .chip,.doc-row .chip{background:#f0f0f8;border:1px solid var(--line);color:var(--ink-soft)}
.chip.alt{background:#ece9ff;border-color:#ddd7ff;color:var(--brand-ink)}
.chip.warn{background:var(--amber-soft);border-color:#ffe6a8;color:#8a6400}

/* ---------- section heads ---------- */
.sec-head{display:flex;align-items:baseline;gap:12px;margin:38px 0 16px}
.sec-head h2{font-size:22px;margin:0;position:relative;display:inline-block}
.sec-head h2:after{content:"";position:absolute;left:0;right:0;bottom:1px;height:7px;background:var(--hl-soft);z-index:-1;border-radius:3px}

/* ---------- exam grid + cards ---------- */
.xgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.xcard{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:18px;box-shadow:var(--shadow);text-decoration:none;color:inherit;transition:transform .14s,box-shadow .18s,border-color .18s}
.xcard:hover{text-decoration:none;transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:#dcd9ff}
.xcard.plain:hover{transform:none}
.xcard-top{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px;min-height:24px}
.xcard h3{font-size:18px;margin:0 0 6px}
.xcard p{color:var(--muted);font-size:14px;margin:0 0 14px;flex:1}
.xcard-foot{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:auto}
.price{font-family:'Space Grotesk';font-weight:700;font-size:16px;color:var(--ink)}
.price.free{color:var(--green)}
.go{font-weight:600;color:var(--brand-ink);font-size:14px}

/* ---------- cta + contact ---------- */
.cta{margin:54px 0 10px;text-align:center;background:linear-gradient(135deg,#1b1842,#2a2470);color:#fff;border-radius:var(--r-lg);padding:46px 24px}
.cta h2{color:#fff;font-size:28px}.cta p{color:#c9c6ec;margin:0 0 22px}
.cta .btn.primary{background:var(--hl);color:#3a2c00;box-shadow:0 10px 24px -10px rgba(255,200,61,.7)}
.contact{margin:48px 0 0;text-align:center}
.contact-row{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:14px}

/* ---------- auth ---------- */
.auth-wrap{flex:1;display:flex;align-items:center;justify-content:center;padding:40px 18px}
.auth-card{width:100%;max-width:430px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:32px;box-shadow:var(--shadow-lg)}
.auth-card .brand{margin-bottom:14px}
.auth-card h1{font-size:24px;margin-bottom:4px}

/* ---------- forms ---------- */
.field{display:block;font-weight:600;font-size:13.5px;margin:14px 0 6px;color:var(--ink-soft)}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=date],select,textarea{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--surface-2);font:inherit;font-size:15px;color:var(--ink);transition:border-color .15s,box-shadow .15s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,70,229,.14);background:#fff}
textarea{min-height:120px;resize:vertical}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.check{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:14px;color:var(--ink-soft);cursor:pointer}
.check input{width:auto}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.err{background:var(--red-soft);border:1px solid #f6cdd3;color:#a81e30;padding:11px 14px;border-radius:12px;margin:12px 0;font-size:14px}
.ok{background:var(--green-soft);border:1px solid #b8e6cd;color:#0c7a48;padding:11px 14px;border-radius:12px;margin:12px 0;font-size:14px}

/* ---------- tabs + panels ---------- */
.tabs{display:flex;gap:6px;background:#ecedf4;border-radius:14px;padding:5px;margin:18px 0;overflow-x:auto}
.tab{flex:1;min-width:max-content;border:none;background:transparent;font-family:'Space Grotesk';font-weight:600;font-size:15px;color:var(--muted);padding:10px 16px;border-radius:10px;cursor:pointer;white-space:nowrap}
.tab.active{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
.panel{display:none}.panel.active{display:block;animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow)}
.card.pad{padding:20px;margin-bottom:16px}
.card h3{font-size:17px}
.seg{display:inline-flex;background:#ecedf4;border-radius:11px;padding:4px;gap:3px}
.seg button{border:none;background:transparent;font:inherit;font-weight:600;font-size:14px;color:var(--muted);padding:8px 14px;border-radius:8px;cursor:pointer}
.seg button.on{background:#fff;color:var(--ink);box-shadow:var(--shadow)}

/* ---------- AI output ---------- */
.out{margin-top:16px}
.bubble{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:20px 22px;box-shadow:var(--shadow);margin-bottom:16px}
.bubble-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:8px}
.qline{font-family:'Space Grotesk';font-weight:600;font-size:13px;color:var(--brand-ink);background:#eceaff;padding:4px 11px;border-radius:999px}
.md{font-size:15.5px;color:var(--ink-soft)}
.md h2{font-size:20px;color:var(--ink);margin:18px 0 8px;position:relative;display:inline-block}
.md h2:after{content:"";position:absolute;left:0;right:0;bottom:2px;height:6px;background:var(--hl-soft);z-index:-1;border-radius:3px}
.md h3{font-size:16.5px;color:var(--ink);margin:14px 0 6px}
.md p{margin:.5em 0}.md ul,.md ol{margin:.5em 0;padding-left:1.3em}.md li{margin:.3em 0}
.md hr{border:none;border-top:1px solid var(--line);margin:18px 0}
.md blockquote{border-left:3px solid var(--brand);background:var(--surface-2);margin:.6em 0;padding:.5em 14px;border-radius:0 10px 10px 0;color:var(--ink-soft)}
.note-tag{display:inline-block;font-size:11px;font-weight:700;color:var(--warn);background:var(--amber-soft);border:1px solid #ffe6a8;border-radius:6px;padding:1px 6px;margin-left:4px;vertical-align:middle}

/* thinking */
.thinking{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:14px}
.dots{display:inline-flex;gap:4px}.dots i{width:7px;height:7px;border-radius:50%;background:var(--brand);animation:bounce 1s infinite}
.dots i:nth-child(2){animation-delay:.15s}.dots i:nth-child(3){animation-delay:.3s}
@keyframes bounce{0%,80%,100%{transform:translateY(0);opacity:.4}40%{transform:translateY(-5px);opacity:1}}
.progress{height:4px;background:#ecedf4;border-radius:999px;margin-top:12px;overflow:hidden}
.progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--brand),var(--brand-2));border-radius:999px;transition:width .4s}

/* out-of-credit modal */
.modal{position:fixed;inset:0;background:rgba(15,16,34,.55);backdrop-filter:blur(3px);display:none;align-items:center;justify-content:center;z-index:60;padding:20px}
.modal-card{background:var(--surface);border-radius:var(--r-lg);padding:30px 26px;max-width:380px;width:100%;text-align:center;box-shadow:var(--shadow-lg);animation:pop .25s ease}
@keyframes pop{from{transform:scale(.94);opacity:0}to{transform:scale(1);opacity:1}}
.modal-emoji{font-size:40px;margin-bottom:8px}
.modal-msg{font-size:16px;color:var(--ink-soft);margin:0 0 18px}

/* packages */
.pack-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin-top:18px}
.pack{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:22px 18px;text-align:center;box-shadow:var(--shadow);transition:transform .14s,box-shadow .18s}
.pack:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.pack-name{font-family:'Space Grotesk';font-weight:600;color:var(--brand-ink)}
.pack-credits{font-family:'Space Grotesk';font-weight:700;font-size:34px;margin:6px 0 0}.pack-credits span{display:block;font-size:12px;font-weight:600;color:var(--muted)}
.pack-bonus{display:inline-block;font-size:12px;font-weight:700;color:#8a6400;background:var(--amber-soft);border-radius:999px;padding:3px 10px;margin:8px 0}
.pack-price{font-family:'Space Grotesk';font-weight:700;font-size:20px;margin:6px 0 14px}

/* history */
.hist-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.hist-list{display:flex;flex-direction:column;gap:10px;margin-top:16px}
.hist-row{display:flex;align-items:center;gap:14px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;box-shadow:var(--shadow);text-decoration:none;color:inherit}
.hist-row:hover{text-decoration:none;border-color:#dcd9ff}
.hist-row .ht{flex:1}.hist-row .go{color:var(--muted)}
.kind{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;font-family:'Space Grotesk';font-weight:700;color:#fff;flex:none}
.kind.ask{background:var(--brand)}.kind.notes{background:var(--green)}.kind.paper{background:var(--hl);color:#3a2c00}

/* general library rows */
.doc-row{display:flex;justify-content:space-between;align-items:center;gap:12px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:11px 14px;margin-bottom:8px;box-shadow:var(--shadow);font-size:14px}

/* ---------- admin ---------- */
.nav.admin{background:#13151f}
.nav.admin .logo{color:#fff}.nav.admin .logo:after{opacity:.9}
.admin-layout{flex:1;display:grid;grid-template-columns:218px 1fr;max-width:1180px;width:100%;margin:0 auto}
.admin-nav{display:flex;flex-direction:column;gap:2px;padding:22px 12px;border-right:1px solid var(--line)}
.admin-nav a{padding:10px 14px;border-radius:10px;color:var(--ink-soft);font-weight:600;font-size:14.5px;text-decoration:none}
.admin-nav a:hover{background:#eef0f6;text-decoration:none}
.admin-nav a.on{background:#eceaff;color:var(--brand-ink)}
.admin-main{padding:28px 26px 60px;min-width:0}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:14px;margin-top:16px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:var(--shadow)}
.stat .num{font-family:'Space Grotesk';font-weight:700;font-size:26px;display:block}
.stat .lbl{color:var(--muted);font-size:13px}
.stat.alert{border-color:#ffd9a8;background:var(--amber-soft)}
.tbl{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);font-size:14px;margin-top:8px}
.tbl th{text-align:left;background:var(--surface-2);padding:12px 14px;font-size:12.5px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);border-bottom:1px solid var(--line)}
.tbl td{padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl tr:last-child td{border-bottom:none}
.tbl tr.rowoff{opacity:.55}
.actions{display:flex;gap:6px;flex-wrap:wrap}.actions form{margin:0}
.inline{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap}.inline .grow{flex:1}
.tag{display:inline-block;font-size:11.5px;font-weight:700;padding:2px 9px;border-radius:999px;background:#eef0f6;color:var(--ink-soft)}
.tag.ok{background:var(--green-soft);color:#0c7a48}.tag.alt{background:#ece9ff;color:var(--brand-ink)}.tag.warn{background:var(--amber-soft);color:#8a6400}

/* ---------- footer ---------- */
.foot{border-top:1px solid var(--line);background:var(--surface);padding:22px 20px;display:flex;flex-wrap:wrap;gap:8px;justify-content:space-between;align-items:center;color:var(--muted);font-size:13.5px}
.foot-links a{color:var(--ink-soft)}

/* ---------- responsive ---------- */
@media(max-width:860px){
  .admin-layout{grid-template-columns:1fr}
  .admin-nav{flex-direction:row;overflow-x:auto;border-right:none;border-bottom:1px solid var(--line);padding:10px 12px}
  .admin-nav a{white-space:nowrap}
  .admin-main{padding:22px 16px 50px}
  .tbl{display:block;overflow-x:auto;white-space:nowrap}
}
@media(max-width:560px){
  .container{padding:24px 15px 50px}
  .hero-in{padding:48px 16px 54px}
  .search{flex-direction:column;background:transparent;box-shadow:none;padding:0;gap:10px}
  .search input{background:#fff;border-radius:14px;box-shadow:var(--shadow-lg)}
  .search .btn{width:100%}
  .grid2{grid-template-columns:1fr}
  .nav-in{flex-wrap:wrap}
  .auth-card{padding:24px 20px}
  .cta{padding:36px 18px}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}