/* Band7 Lab — exam-shell landing design system.
   Concept: the marketing page lives inside a faithful Computer-Delivered IELTS
   exam shell. Serious, institutional, utilitarian — looks like the real test
   software. Light "test paper" theme, IELTS navy + highlighter yellow, sharp
   corners, borders over shadows. Accessible + modern nav. */
:root{
  --bg:#faf9f5; --surface:#ffffff; --fg:#1b2230; --muted:#5b6472;
  --primary:#243a66; --primary-fg:#fbfbf7;
  --chrome:#1c2742; --chrome-fg:#f4f6fa;
  --status:#4f74c4; --status-fg:#ffffff;
  --accent:#f1c40f; --accent-ink:#3a2e00; --highlight:rgba(245,210,40,.55);
  --rule:#c8ccd4; --rule-soft:#e4e7ec; --secondary:#eef0f4;
  --r-sm:2px; --r-md:3px; --r-lg:4px;
  --sans:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;
  --serif:"Source Serif 4",Georgia,"Times New Roman",serif;
  --mono:"JetBrains Mono",ui-monospace,Consolas,"Courier New",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);font-size:16.5px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--status);outline-offset:2px}
.skip{position:absolute;left:-9999px;top:0;background:var(--primary);color:#fff;padding:10px 14px;z-index:100}
.skip:focus{left:8px;top:8px}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px}
.mono{font-family:var(--mono);text-transform:uppercase;letter-spacing:.12em;font-size:11px;color:var(--muted)}
.marker{background:var(--highlight);padding:0 .15em;box-decoration-break:clone;-webkit-box-decoration-break:clone}

/* sticky site header (modern nav) */
.site{position:sticky;top:0;z-index:40;background:var(--chrome);color:var(--chrome-fg);border-bottom:1px solid #0e1426}
.site-in{max-width:1140px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:16px}
.logo{display:flex;align-items:center;gap:9px;color:var(--chrome-fg);font-weight:700;letter-spacing:-.2px}
.logo:hover{text-decoration:none}
.logo .pip{display:inline-flex;width:28px;height:28px;border-radius:var(--r-md);background:var(--status);color:#fff;font-weight:800;align-items:center;justify-content:center;font-size:14px}
.site nav{margin-left:auto;display:flex;align-items:center;gap:6px}
.site nav a{color:#c3cbdb;padding:8px 12px;border-radius:var(--r-md);font-size:14px;font-weight:500}
.site nav a:hover{color:#fff;background:rgba(255,255,255,.08);text-decoration:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;cursor:pointer;border:1px solid transparent;border-radius:var(--r-md);padding:10px 18px;font-size:14.5px;transition:opacity .12s,background .12s}
.btn-accent{background:var(--accent);color:var(--accent-ink);border-color:#caa400}
.btn-accent:hover{opacity:.92;text-decoration:none}
.btn-primary{background:var(--primary);color:var(--primary-fg)}
.btn-primary:hover{opacity:.92;text-decoration:none}
.btn-ghost{background:transparent;color:var(--primary);border-color:var(--rule)}
.btn-ghost:hover{background:var(--secondary);text-decoration:none}
.btn-lg{padding:13px 24px;font-size:16px}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid #39507f;color:#fff;border-radius:var(--r-md);padding:8px 10px;cursor:pointer}

/* exam shell chrome */
.shell{background:var(--surface);border:1px solid var(--rule);border-radius:var(--r-lg);overflow:hidden;box-shadow:0 1px 0 rgba(0,0,0,.02)}
.shell-title{display:flex;align-items:center;gap:8px;background:var(--chrome);color:var(--chrome-fg);padding:7px 12px;font-size:12.5px;font-family:var(--mono);letter-spacing:.04em}
.shell-title .dots{display:flex;gap:6px;margin-left:auto}
.shell-title .dots i{width:11px;height:11px;border-radius:50%;background:#46527a;display:inline-block}
.shell-status{display:flex;align-items:center;gap:12px;background:var(--status);color:var(--status-fg);padding:7px 12px;font-size:12.5px}
.shell-status .pill{margin-left:auto;background:rgba(0,0,0,.35);border-radius:999px;padding:3px 12px;font-family:var(--mono);letter-spacing:.08em}
.shell-ribbon{display:flex;gap:4px;background:var(--secondary);border-bottom:1px solid var(--rule);padding:6px 10px;flex-wrap:wrap}
.shell-ribbon span{font-size:12px;color:var(--muted);padding:4px 9px;border:1px solid var(--rule-soft);border-radius:var(--r-sm);background:#fff}
.shell-panes{display:grid;grid-template-columns:1fr 1fr}
.pane{padding:18px 20px}
.pane+.pane{border-left:1px solid var(--rule)}
.pane h4{margin:0 0 8px;font-size:13px;color:var(--muted);font-family:var(--mono);text-transform:uppercase;letter-spacing:.1em}
.pane .q{font-family:var(--serif);font-size:16px;line-height:1.6;color:var(--fg)}
.pane .typed{font-family:var(--serif);font-size:15px;color:#2a323f;line-height:1.7}
.cursor{display:inline-block;width:8px;height:1.1em;background:var(--status);vertical-align:-2px;animation:blink 1.1s step-end infinite}
@keyframes blink{50%{opacity:0}}
.shell-foot{display:flex;align-items:center;gap:6px;background:var(--secondary);border-top:1px solid var(--rule);padding:7px 12px}
.qnum{width:26px;height:26px;display:inline-flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:12px;border:1px solid var(--rule);border-radius:var(--r-sm);background:#fff;color:var(--muted)}
.qnum-active{background:var(--primary);color:#fff;border-color:var(--primary)}
.qnum-done{background:#dfe4ee;color:var(--primary);border-color:#b9c2d6}
.shell-foot .end{margin-left:auto;font-size:12.5px;color:var(--primary);font-weight:600}
.hero-ans{width:100%;min-height:150px;resize:vertical;border:none;background:transparent;font-family:var(--serif);font-size:15px;line-height:1.7;color:#2a323f;padding:0;display:block}
.hero-ans:focus{outline:none}
.hero-ans::placeholder{color:#9aa3b2}
.shell-foot .heromark{margin-left:auto;background:var(--accent);color:var(--accent-ink);border:1px solid #caa400;border-radius:var(--r-md);padding:8px 16px;font-weight:800;font-size:13.5px;cursor:pointer;transition:opacity .12s}
.shell-foot .heromark:hover{opacity:.92}

/* sections */
section{border-bottom:1px solid var(--rule)}
.sec{padding:64px 0}
.sec-label{font-family:var(--mono);color:var(--status);margin-bottom:14px}
h1{font-size:clamp(32px,5vw,52px);line-height:1.04;letter-spacing:-.02em;font-weight:700;margin:0 0 18px}
h2{font-size:clamp(24px,3.2vw,34px);line-height:1.08;letter-spacing:-.015em;font-weight:700;margin:0 0 14px}
.lede{font-size:18px;color:var(--muted);line-height:1.6;max-width:60ch;margin:0 0 24px}

/* hero */
.hero{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;padding:56px 0 64px}
.hero .stats{display:flex;gap:26px;margin-top:26px;flex-wrap:wrap}
.hero .stat .n{font-family:var(--mono);font-size:22px;font-weight:600;color:var(--primary)}
.hero .stat .l{font-size:12.5px;color:var(--muted);max-width:14ch}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}

/* criteria cards */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.card{background:var(--surface);border:1px solid var(--rule);border-radius:var(--r-md);padding:16px 18px}
.card h3{margin:0 0 6px;font-size:16px}
.card p{margin:0;font-size:14px;color:var(--muted)}
.bar{height:6px;background:var(--secondary);border:1px solid var(--rule-soft);border-radius:999px;margin-top:12px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--status)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--rule);border-radius:var(--r-md);overflow:hidden;background:var(--surface)}
.step{padding:20px;border-right:1px solid var(--rule)}
.step:last-child{border-right:none}
.step .n{font-family:var(--mono);color:var(--status);font-size:13px;margin-bottom:8px}
.step b{display:block;margin-bottom:5px}
.step p{margin:0;font-size:14px;color:var(--muted)}

/* report preview rows */
.rep-row{padding:10px 0;border-bottom:1px solid var(--rule-soft);font-size:14px}
.rep-row:last-child{border-bottom:none}
.rep-band{font-family:var(--mono);font-weight:600;color:var(--primary)}
.bad{color:#b23b3b}.good{color:#1f7a4d}

/* faq */
.faq details{border:1px solid var(--rule);border-radius:var(--r-md);margin-bottom:8px;background:var(--surface)}
.faq summary{cursor:pointer;padding:14px 16px;font-weight:600;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--muted)}
.faq details[open] summary::after{content:"–"}
.faq p{margin:0 16px 14px;color:var(--muted);font-size:14.5px}

/* closing + footer */
.close{text-align:center;padding:64px 20px;background:var(--primary);color:var(--primary-fg)}
.close h2{color:#fff}
.close p{color:#c7d2ea;max-width:48ch;margin:0 auto 22px}
.foot{padding:40px 0;font-size:13px;color:var(--muted)}
.foot .cols{display:flex;gap:40px;flex-wrap:wrap;margin-bottom:20px}
.foot a{color:var(--muted)}
.foot .disc{border-top:1px solid var(--rule-soft);padding-top:16px;line-height:1.6}

@media(max-width:820px){
  .hero,.shell-panes,.grid2{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .step{border-right:none;border-bottom:1px solid var(--rule)}
  .pane+.pane{border-left:none;border-top:1px solid var(--rule)}
  .site nav{display:none;position:absolute;top:52px;left:0;right:0;flex-direction:column;background:var(--chrome);padding:8px;gap:2px;border-bottom:1px solid #0e1426}
  .site nav.open{display:flex}
  .site nav a{padding:11px 12px}
  .nav-toggle{display:inline-block}
}