:root{
  --navy-950:#0b1730;
  --navy-900:#0f1f3d;
  --navy-800:#152a52;
  --navy-700:#1c3868;
  --blue-accent:#2f6fed;
  --blue-accent-dark:#1f56c9;
  --gold:#e0a94d;
  --bg-light:#f4f6fb;
  --text-dark:#152238;
  --text-muted:#5c6b85;
  --white:#ffffff;
  --radius:14px;
  --shadow:0 8px 24px rgba(15,31,61,.08);
  --font-display:"Marcellus","Georgia",serif;
  --font-body:"Inter","Segoe UI",sans-serif;
}
*{box-sizing:border-box}
body{margin:0;font-family:var(--font-body);color:var(--text-dark);background:var(--bg-light);line-height:1.5}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
ul{list-style:none;margin:0;padding:0}
.container{max-width:1280px;margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--font-display);margin:0}
button{font-family:inherit;cursor:pointer}

/* ===== Header ===== */
.site-header{background:var(--navy-950);position:sticky;top:0;z-index:100;box-shadow:0 2px 12px rgba(0,0,0,.25)}
.header-top{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.logo{display:flex;align-items:center;gap:12px;color:var(--white)}
.logo .icon{width:42px;height:42px;background:var(--blue-accent);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px}
.logo .name b{display:block;font-size:15px;letter-spacing:.5px}
.logo .name span{display:block;font-size:11px;color:#9fb0d4}
.header-actions{display:flex;align-items:center;gap:10px}
.lang-switch{display:flex;gap:4px;background:var(--navy-800);border-radius:8px;padding:3px}
.lang-switch a{padding:5px 10px;font-size:12px;color:#c7d3ec;border-radius:6px}
.lang-switch a.active{background:var(--blue-accent);color:#fff}
.icon-btn{width:38px;height:38px;border-radius:8px;background:var(--navy-800);color:#c7d3ec;border:none;display:flex;align-items:center;justify-content:center;font-size:16px}
.btn-login{background:var(--blue-accent);color:#fff;padding:9px 18px;border-radius:8px;font-size:14px;font-weight:600;border:none;display:inline-flex;align-items:center;gap:6px}
.btn-login:hover{background:var(--blue-accent-dark)}
.main-nav{display:flex;gap:6px;border-top:1px solid rgba(255,255,255,.08);padding:6px 0;overflow-x:auto}
.main-nav a{color:#c7d3ec;font-size:13px;font-weight:600;letter-spacing:.3px;padding:10px 14px;border-radius:8px;white-space:nowrap}
.main-nav a:hover,.main-nav a.active{background:var(--navy-800);color:#fff}

/* ===== Hero ===== */
.hero{position:relative;color:#fff;padding:70px 0 90px;overflow:hidden;background:linear-gradient(120deg,rgba(11,23,48,.92),rgba(15,31,61,.75)),url('../images/hero-library.jpg') center/cover}
.hero-inner{position:relative;max-width:640px}
.hero h1{font-size:42px;line-height:1.2;margin-bottom:16px}
.hero p{color:#c7d3ec;font-size:16px;margin-bottom:28px}
.hero-search{display:flex;background:#fff;border-radius:12px;padding:6px;box-shadow:var(--shadow);max-width:560px}
.hero-search input{flex:1;border:none;outline:none;padding:12px 16px;font-size:14px;border-radius:10px}
.hero-search button{background:var(--blue-accent);color:#fff;border:none;width:46px;border-radius:10px;font-size:16px}
.hero-tags{margin-top:16px;display:flex;gap:8px;flex-wrap:wrap;align-items:center;font-size:13px;color:#9fb0d4}
.hero-tags a{background:rgba(255,255,255,.08);color:#dbe4f7;padding:6px 12px;border-radius:20px;font-weight:600}
.hero-tags a:hover{background:var(--blue-accent)}

/* AI widget floating card in hero */
.ai-card{position:absolute;right:24px;top:60px;width:270px;background:rgba(21,42,82,.85);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:22px;text-align:center}
.ai-card .bot-avatar{width:56px;height:56px;border-radius:50%;background:var(--blue-accent);margin:0 auto 12px;display:flex;align-items:center;justify-content:center;font-size:26px}
.ai-card h3{font-size:16px;margin-bottom:6px}
.ai-card p{font-size:12px;color:#c7d3ec;margin-bottom:14px}
.ai-card .btn-chat{display:block;background:var(--blue-accent);color:#fff;padding:10px;border-radius:8px;font-size:13px;font-weight:700;margin-bottom:10px}
.ai-card .tg-link{font-size:12px;color:#9fb0d4}
.ai-card .tg-link b{color:#fff}

/* ===== Category quick links ===== */
.quick-cats{margin-top:-46px;position:relative;z-index:5}
.quick-cats .grid{display:grid;grid-template-columns:repeat(8,1fr);gap:14px}
.quick-cats .card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 10px;text-align:center;font-size:13px;font-weight:600}
.quick-cats .card .ic{width:42px;height:42px;border-radius:10px;margin:0 auto 10px;display:flex;align-items:center;justify-content:center;font-size:18px;color:#fff}
.quick-cats .card:hover{transform:translateY(-3px);transition:.2s}

/* ===== Section headers ===== */
.section{padding:46px 0}
.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.section-head h2{font-size:22px}
.section-head .see-all{font-size:13px;font-weight:700;color:var(--blue-accent)}

/* ===== Book cards ===== */
.books-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:18px}
.book-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.book-card .cover{aspect-ratio:3/4;background:#dfe6f5;position:relative;overflow:hidden}
.book-card .cover img{width:100%;height:100%;object-fit:cover}
.book-card .views{position:absolute;top:8px;left:8px;background:rgba(0,0,0,.55);color:#fff;font-size:11px;padding:3px 8px;border-radius:12px}
.book-card .info{padding:12px}
.book-card .info .author{font-size:11px;color:var(--text-muted)}
.book-card .info .title{font-size:13.5px;font-weight:700;margin-top:2px}

/* ===== News / announcement lists ===== */
.list-3col{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.news-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.news-card img{height:140px;object-fit:cover}
.news-list-item{display:flex;gap:12px;padding:12px;background:#fff;border-radius:12px;box-shadow:var(--shadow);margin-bottom:12px}
.news-list-item img{width:64px;height:64px;border-radius:8px;object-fit:cover;flex-shrink:0}
.news-list-item .title{font-size:13.5px;font-weight:700;margin-bottom:4px}
.news-list-item .meta{font-size:11px;color:var(--text-muted)}

/* ===== Map section ===== */
.map-section{background:var(--navy-950);color:#fff;padding:50px 0;margin-top:20px}
.map-section h2{color:#fff;text-align:center;margin-bottom:26px;font-size:22px}
.map-wrap{display:grid;grid-template-columns:1fr 1.4fr;gap:30px;align-items:center}
.region-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.region-grid a{background:var(--navy-800);color:#dbe4f7;padding:10px 14px;border-radius:8px;font-size:13px;font-weight:600;display:flex;align-items:center;gap:8px}
.region-grid a.active{background:var(--blue-accent);color:#fff}

/* ===== Footer ===== */
.site-footer{background:var(--navy-950);color:#9fb0d4;padding:22px 0;font-size:13px}
.footer-inner{display:flex;justify-content:space-between;align-items:center}
.socials{display:flex;gap:10px}
.socials a{width:32px;height:32px;border-radius:8px;background:var(--navy-800);display:flex;align-items:center;justify-content:center;color:#fff}

/* ===== Page header (inner pages) ===== */
.page-hero{background:var(--navy-900);color:#fff;padding:40px 0}
.page-hero h1{font-size:28px}
.breadcrumb{font-size:13px;color:#9fb0d4;margin-top:6px}
.breadcrumb a{color:var(--gold)}

.filters-bar{display:flex;gap:10px;flex-wrap:wrap;margin:24px 0}
.filters-bar select,.filters-bar input{padding:10px 14px;border-radius:8px;border:1px solid #dbe1ee;font-size:13px}

.form-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:30px;max-width:640px}
.form-row{margin-bottom:16px}
.form-row label{display:block;font-size:13px;font-weight:700;margin-bottom:6px}
.form-row input,.form-row textarea,.form-row select{width:100%;padding:12px 14px;border-radius:8px;border:1px solid #dbe1ee;font-size:14px;font-family:inherit}
.btn-primary{background:var(--blue-accent);color:#fff;border:none;padding:12px 24px;border-radius:8px;font-weight:700;font-size:14px}
.btn-primary:hover{background:var(--blue-accent-dark)}
.alert{padding:12px 16px;border-radius:8px;font-size:13px;margin-bottom:16px}
.alert-success{background:#e4f7ec;color:#1e7d4c}
.alert-error{background:#fdeaea;color:#b5292c}

/* ===== AI Chat widget (all pages) ===== */
.chat-fab{position:fixed;bottom:24px;right:24px;width:60px;height:60px;border-radius:50%;background:var(--blue-accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:24px;box-shadow:0 8px 20px rgba(47,111,237,.4);border:none;z-index:200}
.chat-window{position:fixed;bottom:96px;right:24px;width:340px;max-height:480px;background:#fff;border-radius:16px;box-shadow:0 20px 50px rgba(0,0,0,.25);display:none;flex-direction:column;overflow:hidden;z-index:200}
.chat-window.open{display:flex}
.chat-header{background:var(--navy-900);color:#fff;padding:14px 16px;display:flex;justify-content:space-between;align-items:center;font-size:14px;font-weight:700}
.chat-header span.dot{width:8px;height:8px;background:#3ee07a;border-radius:50%;display:inline-block;margin-right:6px}
.chat-body{flex:1;padding:14px;overflow-y:auto;font-size:13px;background:#f4f6fb;display:flex;flex-direction:column;gap:10px}
.msg{max-width:80%;padding:10px 12px;border-radius:12px;line-height:1.4}
.msg.bot{background:#fff;box-shadow:var(--shadow);align-self:flex-start;border-bottom-left-radius:2px}
.msg.user{background:var(--blue-accent);color:#fff;align-self:flex-end;border-bottom-right-radius:2px}
.chat-input-bar{display:flex;padding:10px;border-top:1px solid #eef1f7;gap:8px}
.chat-input-bar input{flex:1;border:1px solid #dbe1ee;border-radius:8px;padding:10px;font-size:13px}
.chat-input-bar button{background:var(--blue-accent);color:#fff;border:none;width:40px;border-radius:8px}
.typing{font-size:12px;color:var(--text-muted);font-style:italic}

/* ===== Responsive ===== */
@media(max-width:1100px){
  .quick-cats .grid{grid-template-columns:repeat(4,1fr)}
  .books-grid{grid-template-columns:repeat(3,1fr)}
  .list-3col{grid-template-columns:1fr}
  .map-wrap{grid-template-columns:1fr}
}
@media(max-width:640px){
  .quick-cats .grid{grid-template-columns:repeat(2,1fr)}
  .books-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:30px}
  .ai-card{position:static;width:100%;margin-top:24px}
  .chat-window{width:92vw;right:4vw}
}