:root{
  --ink:#10243A;
  --ink-soft:#4A6178;
  --paper:#F3F6F8;
  --card:#FFFFFF;
  --line:#DCE5EC;
  --amber:#E8A020;
  --stage-1:#1C7A5E;
  --stage-2:#2A5FA8;
  --stage-3:#7B3F9D;
  --radius:14px;
  --shadow:0 1px 2px rgba(16,36,58,.06), 0 8px 24px rgba(16,36,58,.07);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:"Almarai",system-ui,sans-serif;color:var(--ink);
  background-color:var(--paper);
  background-image:
    linear-gradient(rgba(16,36,58,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(16,36,58,.035) 1px,transparent 1px);
  background-size:26px 26px;line-height:1.8;
}
h1,h2,h3{font-family:"Changa",system-ui,sans-serif;line-height:1.35;margin:0}
a{color:inherit;text-decoration:none}
.wrap{max-width:1100px;margin:0 auto;padding:0 18px}

/* topbar */
.topbar{background:var(--ink);color:#DCE7F0;font-size:13.5px}
.topbar .wrap{display:flex;gap:20px;align-items:center;height:42px;overflow-x:auto;scrollbar-width:none}
.topbar .wrap::-webkit-scrollbar{display:none}
.topbar a{white-space:nowrap;opacity:.85}
.topbar a:hover{opacity:1;color:var(--amber)}

/* header */
header{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.head{display:flex;align-items:center;gap:18px;height:76px}
.logo{display:flex;align-items:center;gap:10px;font-family:"Changa";font-weight:800;font-size:23px}
.logo .mark{width:38px;height:38px;border-radius:10px;background:var(--ink);color:#fff;display:grid;place-items:center;font-size:21px}
.search{flex:1;position:relative;max-width:460px;margin:0}
.search input{width:100%;height:44px;border:1px solid var(--line);border-radius:999px;padding:0 44px 0 16px;font-family:inherit;font-size:15px;background:var(--paper);color:var(--ink)}
.search input:focus{outline:2px solid var(--amber);outline-offset:1px;background:#fff}
.search svg{position:absolute;right:15px;top:12px;opacity:.45;pointer-events:none}
.search.big{max-width:100%;margin:0 0 22px}
.app-btn{background:var(--amber);color:#231502;font-weight:700;font-family:"Changa";padding:10px 18px;border-radius:999px;font-size:14.5px;white-space:nowrap}
.app-btn:hover{filter:brightness(1.06)}
@media(max-width:760px){.app-btn{display:none}.head{height:66px;gap:12px}}

/* breadcrumbs */
.crumbs{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13.5px;color:var(--ink-soft);padding:20px 0 0}
.crumbs a:hover{color:var(--amber)}
.crumbs i{opacity:.4;font-style:normal}

/* hero / page head */
.hero{padding:52px 0 30px;text-align:center}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:.5px;color:var(--ink-soft);border:1px solid var(--line);background:#fff;padding:5px 14px;border-radius:999px;margin-bottom:16px}
.hero h1{font-size:clamp(28px,5vw,44px);font-weight:800}
.hero p{max-width:620px;margin:14px auto 0;color:var(--ink-soft);font-size:16.5px}
.page-head{padding:26px 0 26px;border-bottom:1px solid var(--line);margin-bottom:8px;position:relative}
.page-head::after{content:"";position:absolute;bottom:-1px;right:0;width:72px;height:3px;background:var(--c,var(--amber));border-radius:2px}
.page-head h1{font-size:clamp(24px,4vw,34px);font-weight:800}
.page-head p{color:var(--ink-soft);margin:8px 0 0;max-width:640px}

/* stages + grids */
.stage{margin-top:44px}
.stage-head{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.stage-head h2{font-size:20px;font-weight:700}
.stage-head .bar{height:3px;flex:1;background:var(--line);border-radius:2px}
.stage-head .dot{width:11px;height:11px;border-radius:50%;flex:none}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(178px,1fr));gap:14px}
.book{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px 18px 16px;box-shadow:var(--shadow);transition:transform .18s ease,box-shadow .18s ease;overflow:hidden;display:block}
.book::before{content:"";position:absolute;top:0;right:0;bottom:0;width:7px;background:var(--c)}
.book:hover{transform:translateY(-4px);box-shadow:0 6px 14px rgba(16,36,58,.1),0 18px 40px rgba(16,36,58,.12)}
.book:focus-visible{outline:2px solid var(--amber);outline-offset:2px}
.book .num{font-family:"Changa";font-size:40px;font-weight:800;color:var(--c);opacity:.22;line-height:1}
.book .name{font-family:"Changa";font-weight:700;font-size:17px;margin-top:6px}
.book .meta{font-size:12.5px;color:var(--ink-soft);margin-top:4px}
.book.sub{padding-top:18px}
.sub-ico{width:40px;height:40px;border-radius:10px;background:color-mix(in srgb,var(--c) 14%,#fff);color:var(--c);display:grid;place-items:center;font-family:"Changa";font-weight:800;font-size:19px;margin-bottom:8px}

/* semester picker */
.sem-pick{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;margin-top:26px}
.sem{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);transition:border-color .18s ease,transform .18s ease}
.sem:hover{border-color:var(--c);transform:translateY(-3px)}
.sem-short{width:48px;height:48px;flex:none;border-radius:12px;background:var(--c);color:#fff;display:grid;place-items:center;font-family:"Changa";font-weight:800;font-size:18px}
.sem small{color:var(--ink-soft)}

/* solution rows */
.solutions{margin-top:52px}
.sol-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px;margin-top:18px}
.sol{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;transition:border-color .18s ease,background .18s ease}
.sol:hover{border-color:var(--amber);background:#FFFDF7}
.sol .pdf{width:42px;height:42px;flex:none;border-radius:9px;background:#FDECEC;color:#C0392B;display:grid;place-items:center;font-family:"Changa";font-weight:700;font-size:12px}
.sol .t{font-weight:700;font-size:15px}
.sol .s{font-size:12.5px;color:var(--ink-soft)}
.empty{color:var(--ink-soft);padding:26px 0;text-align:center}

/* download buttons */
.dl-row{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0 4px}
.dl{border:1px solid var(--line);background:#fff;border-radius:999px;padding:11px 20px;font-size:14.5px;font-weight:700;transition:border-color .18s ease}
.dl:hover{border-color:var(--ink)}
.dl.primary{background:var(--amber);border-color:var(--amber);color:#231502}
.dl.primary:hover{filter:brightness(1.06)}

/* chapters */
.chapters{list-style:none;padding:0;margin:0;display:grid;gap:10px}
.chapters li{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 16px}
.ch-n{width:32px;height:32px;flex:none;border-radius:8px;background:var(--paper);color:var(--ink-soft);display:grid;place-items:center;font-family:"Changa";font-weight:700}
.ch-t{flex:1;font-size:15px}
.ch-t small{color:var(--ink-soft);font-size:12.5px}
.ch-dl{background:var(--ink);color:#fff;padding:7px 18px;border-radius:999px;font-size:13.5px;font-weight:700}
.ch-dl:hover{background:var(--amber);color:#231502}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:9px}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 16px;font-size:14px}
.chip:hover{border-color:var(--ink);background:var(--ink);color:#fff}

/* text blocks */
.about{margin-top:52px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:32px}
.about h2{font-size:21px;margin-bottom:10px}
.about h2+p{margin-top:0}
.about p{color:var(--ink-soft);margin:0 0 18px}
.about p:last-child{margin-bottom:0}
.about a{color:var(--stage-2);font-weight:700}

/* contact form */
.contact{display:grid;gap:14px;max-width:520px}
.contact label{display:grid;gap:6px;font-size:14px;font-weight:700}
.contact input,.contact textarea{border:1px solid var(--line);border-radius:10px;padding:11px 14px;font-family:inherit;font-size:15px;background:var(--paper)}
.contact input:focus,.contact textarea:focus{outline:2px solid var(--amber);outline-offset:1px;background:#fff}
.contact button{background:var(--ink);color:#fff;border:0;border-radius:999px;padding:12px 26px;font-family:"Changa";font-weight:700;font-size:15px;cursor:pointer;justify-self:start}
.contact button:hover{background:var(--amber);color:#231502}
.done{color:var(--stage-1);font-weight:700}

/* share + footer */
.share{margin-top:34px;text-align:center}
.share span{font-size:14px;color:var(--ink-soft)}
.share ul{list-style:none;display:flex;gap:10px;justify-content:center;padding:0;margin:12px 0 0;flex-wrap:wrap}
.share a{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 18px;font-size:14px}
.share a:hover{border-color:var(--ink);background:var(--ink);color:#fff}
footer{margin-top:56px;background:var(--ink);color:#B9CBDB;padding:32px 0;font-size:14px}
footer .wrap{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;align-items:center}
footer a:hover{color:var(--amber)}
footer nav{display:flex;gap:18px;flex-wrap:wrap}

@media (prefers-reduced-motion:reduce){*{transition:none!important}}