/* ROI Prep shared design: tokens, type, top bar, logo, buttons, difficulty badges, footer. Linked by every page. */
:root{
  --bg:#f5f4f0; --surface:#fff; --raised:#fff; --ink:#14161c; --muted:#5b606c; --line:#dcdad3;
  --brand:#4b3df5; --brand-ink:#fff; --lime:#c8f03c; --lime-ink:#14161c;
  --d1:#1f8a4c; --d2:#2563eb; --d3:#c27803; --d4:#d0342c;
  --l:40%; --soft:93%; --shadow:0 1px 2px rgba(20,22,28,.06),0 8px 24px rgba(20,22,28,.08);
  --f-display:"Barlow Condensed","Arial Narrow",Arial,sans-serif;
  --f-body:"Source Sans 3","Segoe UI",system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root{
  --bg:#0d0f14; --surface:#151821; --raised:#1b1f2a; --ink:#eceef3; --muted:#9ba2b1; --line:#262b37;
  --brand:#8f86ff; --brand-ink:#0d0f14;
  --d1:#4cc985; --d2:#7aa7ff; --d3:#f2b94a; --d4:#ff8178;
  --l:70%; --soft:17%; --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px rgba(0,0,0,.35); color-scheme:dark;}}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.5;overflow-x:hidden}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
h1,h2,h3{font-family:var(--f-display);margin:0;line-height:1.02;text-wrap:balance}
h2{font-size:clamp(2rem,4.5vw,2.8rem);font-weight:700}
a{color:var(--brand)}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
.eyebrow{font-family:var(--f-mono);font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.btn{display:inline-flex;align-items:center;gap:8px;font:inherit;font-weight:700;border-radius:999px;padding:10px 18px;text-decoration:none;border:0;cursor:pointer;white-space:nowrap}
.btn.primary{background:var(--brand);color:var(--brand-ink)}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn:hover{filter:brightness(1.08)}

/* top bar */
.bar{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bar .wrap{display:flex;align-items:center;gap:20px;height:60px}
.logo{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink);font-family:var(--f-display);font-weight:700;font-size:1.55rem;letter-spacing:.01em}
.logo svg{width:28px;height:28px}
.beta{font-family:var(--f-mono);font-size:.62rem;font-weight:600;letter-spacing:.1em;background:var(--lime);color:var(--lime-ink);padding:2px 6px;border-radius:4px}
.bar nav{display:flex;gap:18px;margin-left:auto}
.bar nav a{color:var(--muted);text-decoration:none;font-weight:600}
.bar nav a:hover{color:var(--ink)}
@media (max-width:720px){.bar nav{display:none}.bar .btn{margin-left:auto}}

footer{border-top:1px solid var(--line);padding:24px 0 48px;color:var(--muted);font-size:.85rem}
footer .wrap{display:grid;gap:8px}
footer a{color:inherit}

/* difficulty: 1 Beginner, 2 Intermediate, 3 Exam level, 4 Hard */
.diff{display:inline-flex;align-items:center;gap:6px;font-family:var(--f-mono);font-size:.68rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;padding:3px 9px;border-radius:999px;color:var(--c);background:color-mix(in srgb,var(--c) 14%,transparent);border:1px solid color-mix(in srgb,var(--c) 35%,transparent)}
.diff::before{content:"";width:22px;height:5px;border-radius:3px;background:linear-gradient(90deg,var(--c) var(--fill),color-mix(in srgb,var(--c) 25%,transparent) 0)}
.diff[data-level="1"]{--c:var(--d1);--fill:25%} .diff[data-level="2"]{--c:var(--d2);--fill:50%}
.diff[data-level="3"]{--c:var(--d3);--fill:75%} .diff[data-level="4"]{--c:var(--d4);--fill:100%}
.foot-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 24px;margin-top:8px}
.foot-row a{color:var(--ink);font-weight:600}
.foot-links{display:flex;flex-wrap:wrap;gap:4px 18px}
.foot-links a{color:var(--muted)}

/* legal pages: terms, refunds, privacy, contact */
.legal{max-width:760px;padding-block:48px 64px}
.legal h1{font-size:clamp(2.4rem,6vw,3.4rem);margin:8px 0 6px}
.legal h2{font-size:1.7rem;margin:32px 0 8px}
.legal p,.legal li{color:var(--ink)}
.legal ul{padding-left:20px}
.legal li{margin:4px 0}
.legal .updated{color:var(--muted);font-size:.9rem;margin:0}

/* accounts: the sign-in / code box on guide previews and /signin, worker-made notice pages */
.notice{min-height:55vh;padding-block:56px 72px;display:grid;align-content:start;justify-items:center}
.notice .gate-card{width:100%}
.notice p{color:var(--muted)}
.notice form{margin:0}
.gate{padding:32px 0 56px;border-top:1px solid var(--line);margin-top:32px}
.gate-card{max-width:620px;display:grid;gap:12px;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:28px;box-shadow:var(--shadow)}
.gate-card h1,.gate-card h2{font-size:clamp(1.9rem,4vw,2.5rem)}
.gate-card p{margin:0}
.gate-form{display:flex;flex-wrap:wrap;align-items:end;gap:10px}
.gate-field{display:grid;gap:6px;flex:1 1 240px;font-weight:600;font-size:.92rem}
.gate-field input{height:48px}
.gate-field input,.gate-field textarea{font:inherit;font-weight:400;font-size:1.05rem;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--bg);color:var(--ink);width:100%}
.gate-field input:focus,.gate-field textarea:focus{outline:3px solid var(--brand);outline-offset:1px}
.gate-form .btn{min-height:48px}
.gate-check{display:flex;align-items:center;gap:8px;flex:1 1 100%;font-weight:600;font-size:.92rem;cursor:pointer}
.gate-check input{width:18px;height:18px;margin:0;accent-color:var(--brand)}
.gate-links{display:flex;flex-wrap:wrap;gap:6px 18px;font-weight:600}
.gate-msg .btn{margin-top:8px}
.gate-buy:empty{display:none}
.gate-buy,.buy{display:grid;gap:6px;justify-items:start}
.buy-note{margin:0;font-size:.9rem;color:var(--muted)}
.btn[aria-disabled="true"]{opacity:.6;cursor:not-allowed;filter:none}
.gate-trap{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.gate-msg:empty{display:none}
.gate-msg{font-weight:600;color:var(--d1)}
.gate-msg.bad,.fb-msg.bad{color:var(--d4)}
.gate-note{font-size:.9rem;color:var(--muted)}
.btn:disabled{opacity:.6;cursor:default;filter:none}
.bar nav a[data-account]{color:var(--brand)}
/* phones: the nav collapses, but the Sign in / Sign out link stays */
@media (max-width:720px){.bar nav:has([data-account]){display:flex}.bar nav:has([data-account]) a:not([data-account]){display:none}.bar nav:has([data-account]) ~ .btn{margin-left:0}}
@media (max-width:420px){.bar .wrap{gap:12px}}
.unlocked{background:color-mix(in srgb,var(--d1) 14%,var(--bg));border-bottom:1px solid color-mix(in srgb,var(--d1) 35%,transparent);padding:10px 0;color:var(--ink)}

/* feedback: floating button + dialog on every guide page */
.fb-open{position:fixed;right:16px;bottom:16px;z-index:40;font:inherit;font-weight:700;font-size:.92rem;padding:10px 16px;border-radius:999px;border:1px solid var(--line);background:var(--raised);color:var(--ink);box-shadow:var(--shadow);cursor:pointer}
.fb-open:hover{border-color:var(--brand)}
dialog.fb{width:min(520px,calc(100vw - 32px));border:1px solid var(--line);border-radius:18px;padding:0;background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
dialog.fb::backdrop{background:rgba(8,10,16,.45)}
.fb-form{display:grid;gap:12px;padding:22px}
.fb-form h2{font-size:1.9rem}
.fb-form p{margin:0;color:var(--muted)}
.fb-msg{font-weight:600;color:var(--d1)!important}
.fb-actions{display:flex;justify-content:flex-end;gap:8px}
@media print{.fb-open,dialog.fb{display:none!important}}