/*
Theme Name: Thư viện Toán — Atlas
Author: TOAN Library
Description: Giao diện thư viện Toán học đa cấp, tối ưu tốc độ, tìm kiếm, PDF và tài liệu di động.
Version: 2.0.3
Requires at least: 6.4
Requires PHP: 8.1
Text Domain: tm-rebuild
License: GPL-2.0-or-later
*/
:root{--ink:#112b3d;--muted:#566b7e;--accent:#087d78;--accent-deep:#066663;--gold:#f7bd5c;--line:#deeaee;--paper:#fff;--bg:#f6f9fa;--soft:#e9f5f3;--radius:17px;--shadow:0 8px 26px rgba(19,54,68,.055)}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--bg);font:16px/1.7 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}img,svg,iframe{max-width:100%}img{height:auto}a{color:var(--accent-deep);text-decoration:none}a:hover{text-decoration:underline}button,input,select{font:inherit}button{cursor:pointer}h1,h2,h3{line-height:1.29;letter-spacing:-.025em}h1{font-size:clamp(1.85rem,3.5vw,3rem)}h2{font-size:clamp(1.4rem,2.4vw,2rem)}h3{font-size:1.14rem}p{margin:0 0 1em}.wrap{width:min(1160px,calc(100% - 36px));margin-inline:auto}.skip{position:absolute;left:12px;top:-100px;z-index:100;background:#fff;padding:10px 18px}.skip:focus{top:8px}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #e8a432;outline-offset:3px}
.masthead{background:#fff;border-bottom:1px solid var(--line)}.masthead-inner{display:flex;gap:24px;min-height:88px;align-items:center;justify-content:space-between}.brand-link{display:flex;gap:12px;align-items:center;color:var(--ink);min-width:0}.brand-link:hover{text-decoration:none}.brand-logo{display:grid;place-items:center;width:47px;height:47px;border-radius:15px;background:#087d78;color:white;font-size:1.6rem;font-weight:800}.brand-copy{display:flex;flex-direction:column;line-height:1.3}.brand-copy strong{font-size:1.23rem;letter-spacing:-.035em}.brand-copy small{font-size:.76rem;color:var(--muted);margin-top:4px}.custom-logo{max-height:55px;width:auto}.header-search{display:flex;align-items:stretch;flex:0 1 480px;background:var(--bg);border:1px solid #cadce0;border-radius:12px;overflow:hidden}.header-search input{background:transparent;border:0;padding:12px 15px;min-width:0;flex:1;width:100%;outline:0}.header-search button,.btn{background:var(--accent);border:0;color:#fff;padding:10px 19px;font-weight:700}.header-search button:hover,.btn:hover{background:var(--accent-deep);text-decoration:none}.menu-toggle{display:none;border:1px solid var(--line);border-radius:10px;padding:8px 12px;background:#fff}.level-nav{background:#fff;border-bottom:1px solid var(--line)}.nav-inner{display:flex;align-items:center;gap:5px;min-height:52px;overflow-x:auto;scrollbar-width:thin}.nav-inner a{flex:none;color:#294659;padding:10px 13px;border-radius:9px;font-size:.92rem;font-weight:650}.nav-inner a:hover,.nav-inner a[aria-current=page]{color:var(--accent-deep);background:var(--soft);text-decoration:none}
.site-main{min-width:0}.container{padding:28px 0 65px}.two-col{display:grid;grid-template-columns:minmax(0,1fr) 278px;gap:25px}.surface{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.surface-pad{padding:25px}.hero{padding:45px;background:linear-gradient(122deg,#e1f4f1 0%,#f9fcfb 65%,#fff9ee 100%);border:1px solid #d1e8e4;position:relative;overflow:hidden}.eyebrow{color:var(--accent-deep);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;font-weight:800;margin-bottom:14px}.hero h1{max-width:790px;margin:0 0 17px}.hero p{font-size:1.06rem;color:#445f6d;max-width:680px}.hero .hero-search{display:flex;background:white;border:1px solid #c4dcd9;border-radius:12px;overflow:hidden;max-width:620px;margin-top:24px}.hero-search input{padding:13px 18px;min-width:0;flex:1;border:0;outline:0}.hero-search button{padding:13px 20px;border:0;background:var(--accent);color:white;font-weight:800}.math-orbit{position:absolute;right:-75px;top:-125px;border:38px solid rgba(0,121,114,.07);width:330px;height:330px;border-radius:50%;pointer-events:none}.section-top{display:flex;align-items:end;justify-content:space-between;gap:16px;margin:33px 0 16px}.section-top h2{margin:0}.section-top p{margin:6px 0 0;color:var(--muted)}.term-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:13px}.term-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:17px;min-width:0;display:flex;flex-direction:column;gap:7px;box-shadow:var(--shadow)}.term-card:hover{text-decoration:none;transform:translateY(-2px);border-color:#92c8c2}.term-icon{font-size:1.6rem;line-height:1.1}.term-card strong{color:var(--ink);font-size:1.04rem}.term-card small{color:var(--muted);font-size:.8rem}.chip-row{display:flex;flex-wrap:wrap;gap:8px}.chip{background:#e8f4f2;padding:5px 11px;border-radius:999px;color:#0e635d;font-size:.78rem;font-weight:750}.archive-heading{margin-bottom:19px}.archive-heading h1{margin:0 0 8px}.archive-heading p{color:var(--muted)}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}.post-card{overflow:hidden;display:flex;flex-direction:column;min-width:0;transition:transform .15s,border-color .15s}.post-card:hover{border-color:#9acac7;transform:translateY(-2px)}.cover-link{display:flex;height:230px;align-items:center;justify-content:center;background:linear-gradient(140deg,#e9f1f1,#f9fbfb);overflow:hidden}.cover-link img{height:100%;width:100%;object-fit:contain}.cover-placeholder{width:106px;height:142px;border-radius:8px;background:#fff;border:1px solid #cddfdc;box-shadow:6px 7px 0 rgba(8,125,120,.08);display:grid;place-items:center;color:var(--accent);font-size:3rem}.card-body{padding:18px 20px;display:flex;flex-direction:column;flex:1}.meta{font-size:.81rem;color:var(--muted)}.card-title{font-size:1.08rem;margin:8px 0;line-height:1.45}.card-title a{color:var(--ink)}.card-title a:hover{color:var(--accent)}.card-excerpt{font-size:.9rem;color:var(--muted);flex:1}.read-link{font-size:.86rem;font-weight:800;margin-top:12px}.widget{padding:20px;margin-bottom:18px}.widget h3{margin:0 0 14px}.widget ul{list-style:none;margin:0;padding:0}.widget li{border-bottom:1px solid var(--line);padding:7px 0}.widget li:last-child{border:0}.widget li a{color:#315062;font-size:.91rem}.widget li .count{float:right;color:var(--muted)}.filters{display:flex;flex-wrap:wrap;gap:9px;align-items:end;margin:18px 0 22px}.filters label{font-size:.8rem;font-weight:700;display:flex;flex-direction:column;gap:5px}.filters select{border:1px solid #c8d8dc;border-radius:9px;padding:8px 10px;background:white;max-width:240px}.filters button{border:0;border-radius:9px;color:#fff;background:var(--accent);padding:9px 15px}.prose{font-size:1.01rem;line-height:1.85;overflow-wrap:anywhere}.prose img{height:auto;max-width:100%;border-radius:8px}.prose iframe{max-width:100%}.prose table{display:block;max-width:100%;overflow:auto;border-collapse:collapse}.prose th,.prose td{border:1px solid var(--line);padding:8px 10px}.prose h2,.prose h3{margin-top:1.5em}.breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;font-size:.82rem;margin:0 0 13px;color:var(--muted)}.breadcrumbs a{color:var(--accent-deep)}.article-header h1{margin:11px 0 14px}.article-featured{max-width:230px;display:block;margin:16px auto 24px;border:1px solid var(--line);border-radius:9px}.article-body{margin-top:18px}.article-footer{border-top:1px solid var(--line);padding-top:15px;margin-top:32px;font-size:.85rem;color:var(--muted)}.tm-pdf-list{margin-top:26px}.tm-pdf-list h2{font-size:1.5rem}.tm-pdf-item{border:1px solid var(--line);padding:17px;border-radius:13px;margin:15px 0;background:#fbfdfd}.tm-pdf-item h3{margin:0 0 12px}.tm-pdf-frame{display:block;width:100%;height:min(80vh,810px);min-height:410px;border:1px solid #d2e1e5;border-radius:9px;background:white}.tm-pdf-item p{margin:13px 0 0}.tm-download{display:inline-flex;padding:8px 14px;background:var(--accent);color:#fff;border-radius:8px;font-weight:700}.tm-download:hover{color:#fff;text-decoration:none;background:var(--accent-deep)}.related{margin-top:26px}.related-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.related-item{padding:17px;font-weight:650;line-height:1.4}.pagination{margin:25px 0}.page-numbers{display:inline-block;border:1px solid var(--line);background:#fff;border-radius:9px;padding:7px 12px;margin:3px}.page-numbers.current{background:var(--accent);border-color:var(--accent);color:#fff}.empty{padding:50px 28px;text-align:center}.site-footer{background:#0d3040;color:#d6e8ec;padding:40px 0 23px}.site-footer a{color:#d6e8ec}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:25px}.footer-grid h3{font-size:1rem;color:white}.footer-grid p{font-size:.88rem;color:#b5cdd5}.footer-menu{list-style:none;padding:0;margin:0}.footer-menu li{margin-bottom:7px}.copyright{border-top:1px solid #32525e;margin-top:26px;padding-top:17px;color:#adc4cd;font-size:.79rem}
@media(max-width:1080px){.term-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:900px){.two-col{grid-template-columns:1fr}.sidebar{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.widget{margin:0}}@media(max-width:740px){.masthead-inner{flex-wrap:wrap;padding:14px 0;min-height:0}.header-search{order:3;flex-basis:100%}.menu-toggle{display:block}.nav-inner{display:none;flex-direction:column;align-items:stretch;gap:0;padding:8px 0}.nav-inner.is-open{display:flex}.nav-inner a{padding:10px 14px}.term-grid{grid-template-columns:repeat(2,1fr)}.cards{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.hero{padding:28px 21px}.math-orbit{display:none}.sidebar{grid-template-columns:1fr}}@media(max-width:490px){.wrap{width:min(100% - 24px,1160px)}.term-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.term-card{padding:13px}.surface-pad{padding:18px}.footer-grid{grid-template-columns:1fr}.hero-search button{padding:9px}.cover-link{height:210px}.tm-pdf-frame{min-height:320px;height:55vh}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}

/* V2.0.1: focused grade 6–12 homepage */
.term-grid.focus-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.term-grid.focus-grid .term-card{min-height:138px;padding:22px 24px}
.quick-start{display:flex;align-items:center;flex-wrap:wrap;gap:9px;padding:15px 18px;margin-top:18px}
.quick-start strong{font-size:.9rem;margin-right:6px}
.quick-start a{background:#e8f4f2;border-radius:999px;padding:6px 12px;font-size:.85rem;font-weight:700}
@media(max-width:550px){.term-grid.focus-grid{grid-template-columns:1fr}.term-grid.focus-grid .term-card{min-height:105px}.quick-start{align-items:flex-start}}

/* V2.0.3 — compact portrait document cards. Applied to shared tml_post_card()
   on homepage, archives, search and post-list templates; single is unchanged. */
.cards{align-items:stretch}
.post-card.post-card--book{
    display:grid;
    grid-template-columns:116px minmax(0,1fr);
    align-items:start;
    gap:14px;
    padding:16px;
    min-height:208px;
    overflow:hidden;
}
.post-card--book .cover-link{
    display:flex;
    width:116px;
    height:174px;
    aspect-ratio:2/3;
    align-items:center;
    justify-content:center;
    background:#edf3f3;
    border:1px solid #e2e9eb;
    border-radius:8px;
    overflow:hidden;
}
.post-card--book .cover-link img{
    display:block;
    width:100%;
    height:100%;
    max-width:100%;
    object-fit:contain;
    object-position:center;
}
.post-card--book .cover-placeholder{
    display:grid;
    place-items:center;
    height:100%;
    width:100%;
    border:0;
    border-radius:0;
    box-shadow:none;
    font-size:2.4rem;
}
.post-card--book .card-body{
    display:flex;
    flex-direction:column;
    gap:0;
    padding:0;
    margin:0;
    min-width:0;
    min-height:174px;
    align-self:stretch;
}
.post-card--book .card-kicker{
    margin:0;
    color:var(--accent-deep);
    font-size:.74rem;
    font-weight:750;
    line-height:1.4;
    letter-spacing:.012em;
}
.post-card--book .card-title{
    margin:7px 0 6px;
    font-size:.97rem;
    font-weight:750;
    line-height:1.4;
    display:-webkit-box;
    -webkit-box-orient:vertical;
    -webkit-line-clamp:3;
    line-clamp:3;
    overflow:hidden;
    overflow-wrap:anywhere;
}
.post-card--book .card-details{
    margin:0 0 6px;
    color:var(--muted);
    font-size:.78rem;
    line-height:1.45;
}
.post-card--book .card-excerpt{
    margin:0 0 8px;
    flex:0 0 auto;
    font-size:.82rem;
    line-height:1.5;
    display:-webkit-box;
    -webkit-box-orient:vertical;
    -webkit-line-clamp:2;
    line-clamp:2;
    overflow:hidden;
    overflow-wrap:anywhere;
}
.post-card--book .read-link{
    display:inline-block;
    align-self:flex-start;
    margin-top:auto;
    padding-top:3px;
    font-size:.81rem;
    line-height:1.45;
}
@media(max-width:490px){
    .post-card.post-card--book{
        grid-template-columns:104px minmax(0,1fr);
        gap:12px;
        padding:12px;
        min-height:182px;
    }
    .post-card--book .cover-link{width:104px;height:156px}
    .post-card--book .card-body{min-height:156px}
    .post-card--book .card-title{font-size:.91rem;margin:5px 0 5px}
    .post-card--book .card-excerpt{font-size:.78rem}
}
@media(max-width:355px){
    .post-card.post-card--book{grid-template-columns:92px minmax(0,1fr);gap:10px;padding:10px}
    .post-card--book .cover-link{width:92px;height:138px}
    .post-card--book .card-body{min-height:138px}
    .post-card--book .card-details{font-size:.75rem}
    .post-card--book .card-title{font-size:.875rem}
}