:root { --blue:#2643c4; --yellow:#ffe45c; --ink:#172036; --muted:#5b6480; --line:#dfe3ee; --soft:#f4f6fc; --bg:#ffffff; --card:#ffffff; }
@media (prefers-color-scheme: dark) { :root { --ink:#e8ebf5; --muted:#a3abc4; --line:#2b3350; --soft:#1b2238; --bg:#10162a; --card:#161d33; --blue:#7f97ff; } }
* { box-sizing:border-box; }
body { margin:0; background:var(--bg); color:var(--ink); font:17px/1.6 "Avenir Next","Segoe UI",system-ui,-apple-system,sans-serif; }
a { color:var(--blue); }
.wrap { max-width:860px; margin:0 auto; padding:0 18px; }
header.top { background:#2643c4; color:#fff; }
header.top .wrap { display:flex; align-items:center; justify-content:space-between; gap:14px; padding:14px 18px; flex-wrap:wrap; }
.brand { color:#fff; text-decoration:none; font-weight:800; letter-spacing:.06em; text-transform:uppercase; font-size:15px; display:flex; align-items:flex-end; gap:9px; }
.blocks { display:inline-flex; align-items:flex-end; gap:3px; }
.blocks i { display:block; width:7px; border-radius:2px; background:#fff; }
.blocks i:nth-child(1){height:7px} .blocks i:nth-child(2){height:12px} .blocks i:nth-child(3){height:17px; background:#ffe45c}
nav a { color:#fff; text-decoration:none; font-weight:600; margin-left:18px; font-size:15px; }
nav a:first-child { margin-left:0; }
main { padding:28px 0 50px; }
h1 { font-size:34px; line-height:1.15; margin:6px 0 14px; letter-spacing:-.01em; }
h2 { font-size:22px; margin:30px 0 10px; }
.lead { font-size:19px; color:var(--muted); margin-top:0; }
.badge { display:inline-block; font-size:12px; font-weight:800; letter-spacing:.06em; padding:2px 10px; border-radius:99px; background:var(--yellow); color:#172036; vertical-align:middle; }
.card { background:var(--card); border:1px solid var(--line); border-radius:14px; padding:18px 20px; margin:14px 0; }
.meaning { font-size:21px; font-weight:600; margin:6px 0 8px; }
.example { font-style:italic; margin:0; }
.say { color:var(--muted); margin:10px 0 0; font-size:15px; }
.from { font-size:15px; color:var(--muted); margin-top:10px; }
.cta { background:var(--soft); border-left:5px solid var(--blue); border-radius:10px; padding:16px 18px; margin:22px 0; }
.cta strong { display:block; font-size:18px; margin-bottom:4px; }
.btn { display:inline-block; background:#2643c4; color:#fff; text-decoration:none; font-weight:700; padding:10px 18px; border-radius:10px; margin-top:8px; border:0; font:inherit; cursor:pointer; }
.btn.alt { background:var(--yellow); color:#172036; }
ul.links { list-style:none; padding:0; display:grid; grid-template-columns:repeat(auto-fill,minmax(230px,1fr)); gap:8px 18px; }
ul.links li a { text-decoration:none; }
ul.links li span { display:block; font-size:14px; color:var(--muted); }
.topics { display:grid; grid-template-columns:repeat(auto-fill,minmax(240px,1fr)); gap:12px; }
.topics a { display:block; text-decoration:none; color:inherit; background:var(--card); border:1px solid var(--line); border-radius:12px; padding:12px 14px; }
.topics a b { display:block; color:var(--blue); }
.topics a span { font-size:14px; color:var(--muted); }
.quiz button.opt { display:block; width:100%; text-align:left; background:var(--card); color:var(--ink); border:2px solid var(--line); border-radius:10px; padding:10px 14px; margin:8px 0; font:inherit; cursor:pointer; }
.quiz button.opt.right { border-color:#2e7d32; background:rgba(46,125,50,.12); }
.quiz button.opt.wrong { border-color:#c62828; background:rgba(198,40,40,.10); }
.quiz .result { font-weight:700; min-height:1.6em; }
input.search { width:100%; font:inherit; padding:12px 14px; border-radius:12px; border:2px solid var(--line); background:var(--card); color:var(--ink); }
#results a { display:block; padding:6px 2px; text-decoration:none; }
#results span { color:var(--muted); font-size:14px; }
.az { display:flex; flex-wrap:wrap; gap:6px; margin:10px 0 20px; }
.az a { text-decoration:none; font-weight:700; padding:3px 9px; border:1px solid var(--line); border-radius:8px; }
footer { border-top:1px solid var(--line); color:var(--muted); font-size:14px; padding:22px 0 40px; }
footer a { color:var(--muted); }
@media (max-width:560px) { h1 { font-size:28px; } nav a { margin-left:12px; } }