/*
Theme Name: Thư viện đề thi HSG Toán
Description: Theme thư viện đề thi học sinh giỏi Toán THCS (lớp 6-9). Gồm loại nội dung "Đề thi" với phân loại lớp, tỉnh/thành, năm, cấp thi.
Version: 1.0
Text Domain: hsg
*/
:root{--b:#1456C7;--bd:#0E3F99;--bl:#EAF3FF;--ink:#12263F;--mut:#5B6F88;--ln:#DCE6F5;--r:14px}
*{box-sizing:border-box}
body{margin:0;font:400 15px/1.6 "Be Vietnam Pro",system-ui,"Segoe UI",sans-serif;color:var(--ink);background:#fff}
a{color:inherit;text-decoration:none}
:focus-visible{outline:3px solid #FFC93C;outline-offset:2px}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
h1,h2,h3{line-height:1.3;margin:0}
.btn{display:inline-block;border:0;cursor:pointer;font:700 14px "Be Vietnam Pro",system-ui,sans-serif;padding:10px 18px;border-radius:10px;background:var(--b);color:#fff;white-space:nowrap}
.btn:hover{background:var(--bd)}
.btn.ghost{background:#fff;color:var(--b);border:1.5px solid var(--b)}
.hd{background:var(--b);color:#fff;position:sticky;top:0;z-index:20}
.hd-in{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px}
.logo{display:flex;gap:10px;align-items:center}
.logo span{display:flex;flex-direction:column;line-height:1.2}
.logo b{font-size:16px}.logo small{font-size:12px;opacity:.9}
.menu{display:flex;gap:4px;list-style:none;margin:0;padding:0}
.menu a{display:block;padding:8px 14px;border-radius:999px;font-weight:600;font-size:14px}
.menu a:hover{background:rgba(255,255,255,.16)}
.menu .on>a,.menu .current-menu-item>a{background:#fff;color:var(--b)}
.burger{display:none;background:none;border:0;color:#fff;font-size:26px;cursor:pointer}
.hero{background:linear-gradient(180deg,#D9E9FF,#F3F8FF);padding:48px 0 76px}
.hero-in{display:grid;grid-template-columns:1.2fr 1fr;gap:24px;align-items:center}
.hero h1{font-size:clamp(28px,4.5vw,40px);font-weight:800}
.hero .sub{display:block;color:var(--b);font-size:.8em;margin-top:4px}
.hero p{color:var(--mut);max-width:520px;margin:14px 0 22px}
.sbar{display:flex;max-width:560px;background:#fff;border:1px solid var(--ln);border-radius:12px;overflow:hidden;box-shadow:0 6px 20px rgba(20,86,199,.12)}
.sbar input{flex:1;min-width:0;border:0;padding:14px 16px;font:inherit;outline:0}
.sbar .btn{border-radius:0}
.art svg{width:100%;max-width:380px;height:auto;display:block;margin-left:auto}
.gts{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:-44px 0 36px;position:relative}
.gt{background:#fff;border:1px solid var(--ln);border-radius:var(--r);padding:20px 12px;text-align:center;box-shadow:0 6px 18px rgba(20,86,199,.1);transition:transform .15s}
.gt:hover{transform:translateY(-3px)}
.num{display:grid;place-items:center;width:56px;height:56px;border-radius:50%;margin:0 auto 8px;color:#fff;font-size:28px;font-weight:800}
.n6{background:#16A34A}.n7{background:#6D4BC9}.n8{background:#1D5FD1}.n9{background:#F28A1E}
.gt b{display:block;font-size:18px}.gt span{color:var(--b);font-size:14px;font-weight:600}
.sec-h{display:flex;justify-content:space-between;align-items:center;margin:8px 0 16px}
.sec-h h2{font-size:20px}.sec-h a{color:var(--b);font-weight:600;font-size:14px}
.cards.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.card{background:#fff;border:1px solid var(--ln);border-radius:var(--r);padding:16px;display:flex;gap:14px;align-items:center}
.card:hover{border-color:var(--b)}
.card h3{font-size:15px;font-weight:700}
.badge{flex:none;font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px;background:var(--bl);color:var(--b)}
.lop-6{background:#DDF5E6;color:#12803A}.lop-7{background:#ECE6FA;color:#573AA6}.lop-8{background:#DCE9FC;color:#1450B0}.lop-9{background:#FDEBD6;color:#B4600A}
.ci{flex:1;min-width:0}
.meta{display:flex;flex-wrap:wrap;gap:4px 14px;color:var(--mut);font-size:13px;margin-top:6px}
.meta i{font-style:normal;margin-right:5px;color:var(--b)}
.chev{font-size:24px;color:var(--mut);padding:0 4px}
.cards.list .card{margin-bottom:12px;padding:16px 20px}
.cards.grid .card{flex-direction:column;align-items:flex-start}
.cards.grid .ci{width:100%}.cards.grid .pdfi,.cards.grid .chev{display:none}
.crumb{font-size:13px;color:var(--mut);padding:18px 0 6px}.crumb a:hover{color:var(--b)}
.ph{font-size:clamp(22px,3.5vw,28px);font-weight:800;margin:6px 0 18px}
.fbar{display:flex;flex-wrap:wrap;gap:10px;background:var(--bl);padding:14px;border-radius:var(--r)}
.fbar input,.fbar select,.rbar select{font:inherit;font-size:14px;padding:10px 12px;border:1px solid var(--ln);border-radius:10px;background:#fff;color:var(--ink);flex:1;min-width:130px}
.fbar input[type=search]{flex:2 1 220px}
.rbar{display:flex;justify-content:space-between;align-items:center;margin:18px 0 12px;font-size:14px}
.rbar select{flex:none;min-width:0;padding:6px 10px}
.empty{padding:36px;text-align:center;border:2px dashed var(--ln);border-radius:var(--r);color:var(--mut)}
.pg{text-align:center;margin:24px 0 8px}
.page-numbers{display:inline-grid;place-items:center;min-width:36px;height:36px;border:1px solid var(--ln);border-radius:8px;margin:0 3px;font-weight:600}
.page-numbers.current{background:var(--b);border-color:var(--b);color:#fff}
.cols{display:grid;grid-template-columns:1fr 330px;gap:28px;margin-top:8px}
.acts{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0 22px}
.box{border:1px solid var(--ln);border-radius:var(--r);padding:18px;margin-bottom:20px;background:#fff}
.box h2{font-size:16px;margin-bottom:12px}
.info{display:grid;grid-template-columns:150px 1fr;gap:8px 12px;margin:0;font-size:14px}.info dt{color:var(--mut)}.info dd{margin:0;font-weight:600}
.prev iframe{width:100%;height:640px;border:1px solid var(--ln);border-radius:10px}
.side{background:#F3F8FF;border-radius:var(--r);padding:18px;align-self:start}
.rel{display:block;padding:12px 0;border-bottom:1px solid var(--ln);font-size:14px;font-weight:600}.rel small{display:block;color:var(--mut);font-weight:400}
.tg{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:12px;margin-bottom:28px}
.tg a{display:flex;justify-content:space-between;gap:8px;padding:12px 14px;border:1px solid var(--ln);border-radius:12px;font-weight:600}
.tg a:hover{border-color:var(--b);color:var(--b)}.tg small{color:var(--mut);font-weight:400}
.steps{padding-left:20px}.steps li{margin-bottom:6px}
.ft{margin-top:56px;background:var(--b);color:#fff;padding:22px 0;text-align:center;font-size:14px}
.bb{display:none}
@media(max-width:860px){
.hero-in,.cols{grid-template-columns:1fr}.art{display:none}.hero{padding:32px 0 64px}
.gts{grid-template-columns:repeat(2,1fr)}.cards.grid{grid-template-columns:1fr 1fr}
.burger{display:block}
.mn{display:none;position:absolute;left:0;right:0;top:100%;background:var(--bd);padding:8px 20px 14px}
.mn.open{display:block}.menu{flex-direction:column}
.cards.list .card{flex-wrap:wrap}.cards.list .ci{flex-basis:calc(100% - 90px)}.cards.list .pdfi,.cards.list .chev{display:none}
.info{grid-template-columns:120px 1fr}.prev iframe{height:460px}
body{padding-bottom:64px}
.bb{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:30;background:#fff;border-top:1px solid var(--ln);padding-bottom:env(safe-area-inset-bottom,0)}
.bb a{flex:1;text-align:center;font-size:11px;padding:8px 2px;color:var(--mut)}.bb a i{display:block;font-style:normal;font-size:20px;line-height:1.2}
.bb a.on{color:var(--b);font-weight:700}
}
@media(max-width:480px){.cards.grid{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){.gt{transition:none}}