/* Đào Duy Từ School – main stylesheet
   Palette drawn from the school emblem: navy, red, gold, magenta accent. */
:root{
  --navy:#16294d; --navy-2:#1f3a68; --slate:#393b51;
  --red:#b5122e; --red-dark:#8f0e24;
  --gold:#c9a227; --gold-2:#e3c565;
  --magenta:#c13584;
  --bg:#eef1f6; --surface:#ffffff; --ink:#1d2433; --muted:#5b6474;
  --border:#d9dee8; --radius:14px;
  --shadow:0 10px 30px rgba(22,41,77,.10);
  --font-sans:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --font-serif:"Playfair Display",Georgia,"Times New Roman",serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy-2);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(1200px,100% - 32px);margin-inline:auto}
.screen-reader-text{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip-link:focus{position:fixed!important;top:8px;left:8px;width:auto;height:auto;clip:auto;background:var(--navy);color:#fff;padding:10px 16px;z-index:200;border-radius:8px}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 22px;border-radius:999px;font-weight:700;font-size:15px;border:2px solid transparent;transition:.2s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-gold{background:var(--gold);color:#231a00;border-color:var(--gold)}
.btn-gold:hover{background:var(--gold-2)}
.btn-navy{background:var(--navy);color:#fff;border-color:var(--navy)}
.btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.8)}
.btn-outline-light:hover{background:rgba(255,255,255,.14)}
.btn-lg{padding:14px 30px;font-size:16px}

/* Topbar */
.topbar{background:var(--navy);color:#cfd9ec;font-size:13px}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;gap:16px;padding-block:7px;flex-wrap:wrap}
.topbar p{margin:0}
.topbar a{color:#e8edf7;margin-left:14px}
.topbar a:first-child{margin-left:0}
.topbar-forum{font-weight:700;color:var(--gold-2)!important}
.topbar-sep{margin-inline:6px;opacity:.6}

/* Header */
.site-header{background:var(--surface);position:sticky;top:0;z-index:100;box-shadow:0 1px 0 var(--border)}
.header-inner{display:flex;align-items:center;gap:20px;padding-block:12px}
.site-branding{display:flex;align-items:center;gap:14px;margin-right:auto}
.brand-emblem img,.custom-logo{width:72px;height:72px;object-fit:contain}
.brand-text p,.brand-text h1{margin:0}
.brand-line-1{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:600}
.brand-name{font-family:var(--font-serif);font-size:34px;line-height:1.05;font-weight:800}
.brand-name a{color:var(--red)}
.brand-name a:hover{text-decoration:none;color:var(--red-dark)}
.brand-line-3{font-size:12.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--navy);font-weight:700}
.header-rule{height:4px;background:linear-gradient(90deg,var(--magenta),var(--red) 35%,var(--gold) 75%,var(--gold-2))}

/* Nav */
.primary-navigation{display:flex;align-items:center;gap:18px}
.primary-navigation ul{list-style:none;margin:0;padding:0;display:flex;gap:4px;flex-wrap:wrap}
.primary-navigation li a{display:block;padding:9px 12px;font-weight:600;font-size:15px;color:var(--slate);border-radius:8px}
.primary-navigation li a:hover{background:var(--bg);text-decoration:none;color:var(--navy)}
.primary-navigation li.current-menu-item>a,.primary-navigation li.current_page_item>a{color:var(--red)}
.primary-navigation .sub-menu{display:none;position:absolute;background:#fff;box-shadow:var(--shadow);border-radius:10px;padding:8px;min-width:220px;flex-direction:column;z-index:120}
.primary-navigation li{position:relative}
.primary-navigation li:hover>.sub-menu,.primary-navigation li:focus-within>.sub-menu{display:flex}
.menu-toggle{display:none;background:none;border:0;padding:10px;cursor:pointer;margin-left:auto}
.menu-toggle span{display:block;width:26px;height:3px;background:var(--navy);margin:5px 0;border-radius:2px;transition:.2s}
.search-form{display:flex;gap:6px}
.primary-navigation .search-form .search-field{width:150px}
.search-field{padding:9px 12px;border:1.5px solid var(--border);border-radius:999px;font:inherit;font-size:14px;background:#fff;color:var(--ink)}
.search-submit{padding:9px 16px;border-radius:999px;border:0;background:var(--navy);color:#fff;font-weight:700;cursor:pointer}
.search-submit:hover{background:var(--navy-2)}

/* Hero */
.hero{position:relative;color:#fff;background:var(--navy)}
.hero::before{content:"";position:absolute;inset:0;background-image:var(--hero-img);background-size:cover;background-position:center 35%;opacity:.9}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(90deg,rgba(14,26,51,.88) 0%,rgba(14,26,51,.62) 55%,rgba(14,26,51,.28) 100%)}
.hero-inner{position:relative;padding-block:84px 72px;max-width:1200px}
.hero-kicker{display:inline-block;margin:0 0 14px;padding:6px 14px;border:1.5px solid var(--gold);color:var(--gold-2);border-radius:999px;font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase}
.hero-title{font-family:var(--font-serif);font-size:clamp(38px,6vw,64px);line-height:1.08;margin:0 0 16px;max-width:720px}
.hero-subtitle{font-size:18px;line-height:1.65;max-width:600px;margin:0 0 28px;color:#e6ebf5}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-stats{list-style:none;display:flex;gap:36px;margin:44px 0 0;padding:22px 0 0;border-top:1px solid rgba(255,255,255,.25);flex-wrap:wrap}
.hero-stats li{display:flex;flex-direction:column}
.hero-stats strong{font-family:var(--font-serif);font-size:32px;color:var(--gold-2);line-height:1}
.hero-stats span{font-size:13px;color:#cfd9ec;margin-top:4px}

/* Quick links */
.quick-links{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:-38px;position:relative;z-index:5}
.quick-link{background:var(--surface);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);border-top:4px solid var(--gold);display:flex;flex-direction:column;gap:4px}
.quick-link:nth-child(2){border-top-color:var(--red)}
.quick-link:nth-child(3){border-top-color:var(--navy)}
.quick-link:nth-child(4){border-top-color:var(--magenta)}
.quick-link:hover{text-decoration:none;transform:translateY(-2px)}
.quick-link{transition:.2s}
.quick-link-title{font-weight:800;color:var(--navy);font-size:16.5px}
.quick-link-desc{font-size:13.5px;color:var(--muted)}

/* Sections */
.section{padding-block:56px}
.section-alt{background:#e6eaf2}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:26px;flex-wrap:wrap}
.section-head h2{font-family:var(--font-serif);font-size:clamp(26px,3.4vw,34px);color:var(--navy);margin:0}
.section-head-center{flex-direction:column;align-items:center;text-align:center}
.section-rule{display:block;width:72px;height:4px;border-radius:2px;background:linear-gradient(90deg,var(--magenta),var(--gold));margin-top:10px}
.section-more{font-weight:700;font-size:14.5px}
.empty-note{background:var(--surface);border:1.5px dashed var(--border);border-radius:var(--radius);padding:22px;color:var(--muted)}

/* Notices */
.section-notices{padding-bottom:0}
.notice-list{list-style:none;margin:0;padding:0;background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.notice-item{display:flex;gap:18px;align-items:baseline;padding:16px 22px;border-bottom:1px solid var(--border)}
.notice-item:last-child{border-bottom:0}
.notice-item time{font-size:13px;font-weight:700;color:var(--red);white-space:nowrap}
.notice-item a{font-weight:600;color:var(--ink)}
.notice-item a:hover{color:var(--navy-2)}

/* Cards */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card-grid-2{grid-template-columns:repeat(2,1fr)}
.card-grid-3{grid-template-columns:repeat(3,1fr)}
.post-card{background:var(--surface);border-radius:var(--radius);overflow:hidden;box-shadow:0 4px 18px rgba(22,41,77,.07);display:flex;flex-direction:column;transition:.2s}
.post-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.post-card-thumb{display:block;aspect-ratio:640/420;overflow:hidden;background:#dfe5ef}
.post-card-thumb img{width:100%;height:100%;object-fit:cover}
.post-card-body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:7px}
.post-card-cat{font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--magenta)}
.post-card-title{margin:0;font-size:18px;line-height:1.4}
.post-card-title a{color:var(--ink)}
.post-card-title a:hover{color:var(--navy-2);text-decoration:none}
.post-card-meta{margin:0;font-size:13px;color:var(--muted)}
.post-card-excerpt{margin:0;font-size:14.5px;color:var(--muted)}
.post-card-sm .post-card-title{font-size:16px}
.list-cards{display:grid;gap:16px}

/* Steps */
.steps{list-style:none;margin:0 0 30px;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.steps li{background:var(--surface);border-radius:var(--radius);padding:20px;box-shadow:0 4px 18px rgba(22,41,77,.07)}
.step-num{display:inline-flex;width:38px;height:38px;border-radius:50%;background:var(--red);color:#fff;font-weight:800;align-items:center;justify-content:center;font-size:17px;margin-bottom:10px}
.steps h3{margin:0 0 6px;font-size:16.5px;color:var(--navy)}
.steps p{margin:0;font-size:14px;color:var(--muted)}

.two-col-sections{display:grid;grid-template-columns:1fr 1fr;gap:36px}

/* Timeline */
.section-timeline{background:var(--navy);color:#e6ebf5}
.section-timeline .section-head h2{color:#fff}
.timeline{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.timeline li{border-top:3px solid var(--gold);padding-top:16px}
.timeline strong{font-family:var(--font-serif);font-size:24px;color:var(--gold-2);display:block;margin-bottom:6px}
.timeline p{margin:0;font-size:14.5px;color:#cdd7ea}

/* Gallery */
.gallery-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gallery-item{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:640/420;display:block}
.gallery-item img{width:100%;height:100%;object-fit:cover;transition:.3s}
.gallery-item:hover img{transform:scale(1.05)}
.gallery-item span{position:absolute;left:0;right:0;bottom:0;padding:26px 16px 12px;color:#fff;font-weight:600;font-size:14.5px;background:linear-gradient(transparent,rgba(10,18,36,.82))}

/* Forum band */
.forum-band{background:linear-gradient(120deg,var(--navy) 0%,var(--navy-2) 60%,#274b8f 100%);color:#fff}
.forum-band-inner{display:flex;align-items:center;justify-content:space-between;gap:28px;padding-block:44px;flex-wrap:wrap}
.forum-band h2{font-family:var(--font-serif);margin:0 0 8px;font-size:clamp(24px,3vw,32px)}
.forum-band p{margin:0;color:#d5deef;max-width:640px}

/* Layout: content + sidebar */
.layout-main{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:36px;padding-block:36px 60px}
.breadcrumbs{font-size:13.5px;color:var(--muted);margin-bottom:16px}
.breadcrumbs a{color:var(--navy-2);font-weight:600}
.page-head h1,.entry-title{font-family:var(--font-serif);color:var(--navy);line-height:1.25;margin:0 0 14px}
.page-head h1{font-size:clamp(28px,4vw,40px)}
.entry-title{font-size:clamp(28px,4vw,42px)}
.archive-desc{color:var(--muted);margin-bottom:8px}
.entry{background:var(--surface);border-radius:var(--radius);padding:30px;box-shadow:0 4px 18px rgba(22,41,77,.06)}
.entry-meta{color:var(--muted);font-size:14px;display:flex;gap:8px;margin:0 0 18px}
.entry-thumb{margin:0 0 22px}
.entry-thumb img{border-radius:10px;width:100%}
.entry-content{font-size:16.5px}
.entry-content h2,.entry-content h3{font-family:var(--font-serif);color:var(--navy)}
.entry-content img{border-radius:8px}
.entry-content table{border-collapse:collapse;width:100%}
.entry-content th,.entry-content td{border:1px solid var(--border);padding:8px 12px;text-align:left}
.entry-tags{font-size:14px;color:var(--muted)}
.post-nav{display:flex;justify-content:space-between;gap:16px;margin:26px 0;font-weight:600;flex-wrap:wrap}
.related{margin-top:34px}
.related h2{font-family:var(--font-serif);color:var(--navy)}
.home-content{background:var(--surface);border-radius:var(--radius);padding:28px}

/* Sidebar */
.site-sidebar .widget{background:var(--surface);border-radius:var(--radius);padding:20px 22px;margin-bottom:20px;box-shadow:0 4px 18px rgba(22,41,77,.06)}
.widget-title{font-size:16px;margin:0 0 12px;color:var(--navy);font-family:var(--font-serif)}
.widget ul{margin:0;padding-left:18px}
.widget li{margin-bottom:6px;font-size:14.5px}

/* Comments */
.comments-area{background:var(--surface);border-radius:var(--radius);padding:26px 30px;margin-top:30px}
.comment-list{list-style:none;padding:0}
.comment-list .comment{border-top:1px solid var(--border);padding:16px 0}
.comment-form input[type="text"],.comment-form input[type="email"],.comment-form input[type="url"],.comment-form textarea{width:100%;padding:10px 12px;border:1.5px solid var(--border);border-radius:10px;font:inherit}
.comment-form .submit{background:var(--navy);color:#fff;border:0;padding:11px 22px;border-radius:999px;font-weight:700;cursor:pointer}

/* Pagination */
.pagination{margin-top:30px}
.pagination .nav-links{display:flex;gap:8px;flex-wrap:wrap}
.pagination .page-numbers{padding:9px 15px;background:var(--surface);border-radius:999px;font-weight:600;box-shadow:0 2px 8px rgba(22,41,77,.07)}
.pagination .page-numbers.current{background:var(--navy);color:#fff}

/* 404 */
.not-found{text-align:center;padding-block:70px}
.not-found img{margin-inline:auto}
.not-found h1{font-family:var(--font-serif);font-size:72px;color:var(--navy);margin:10px 0}
.not-found .search-form{justify-content:center;margin-top:18px}

/* Footer */
.site-footer{background:#101d36;color:#c3cfe4;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:34px;padding-block:52px 40px}
.footer-brand img{margin-bottom:12px}
.footer-school{font-family:var(--font-serif);font-size:21px;color:#fff;margin:0 0 6px;font-weight:700}
.footer-tagline{margin:0;font-size:14.5px;color:#9fb0cf}
.site-footer h3{color:#fff;font-family:var(--font-serif);font-size:18px;margin:0 0 14px}
.footer-contact,.footer-menu{list-style:none;margin:0;padding:0}
.footer-contact li,.footer-menu li{margin-bottom:9px;font-size:14.5px}
.site-footer a{color:#dbe4f5}
.site-footer a:hover{color:var(--gold-2)}
.footer-forum p{font-size:14.5px;color:#9fb0cf;margin:0 0 16px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.14)}
.footer-bottom-inner{display:flex;justify-content:space-between;gap:14px;padding-block:16px;font-size:13.5px;flex-wrap:wrap}
.footer-bottom p{margin:0}

/* WordPress core alignments */
.alignleft{float:left;margin:6px 20px 12px 0}
.alignright{float:right;margin:6px 0 12px 20px}
.aligncenter{display:block;margin-inline:auto}
.wp-caption{max-width:100%}
.wp-caption-text{font-size:13px;color:var(--muted);text-align:center;margin-top:6px}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.sticky{outline:2px solid var(--gold);outline-offset:-2px}

/* Responsive */
@media (max-width:1024px){
  .quick-links{grid-template-columns:repeat(2,1fr)}
  .steps,.timeline{grid-template-columns:repeat(2,1fr)}
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .layout-main{grid-template-columns:1fr}
  .site-sidebar{order:2}
}
@media (max-width:820px){
  .menu-toggle{display:block}
  .primary-navigation{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;box-shadow:var(--shadow);padding:14px 16px;flex-direction:column;align-items:stretch}
  .site-header{position:sticky}
  .header-inner{position:relative;flex-wrap:wrap}
  .primary-navigation.open{display:flex}
  .primary-navigation ul{flex-direction:column}
  .primary-navigation .search-form{margin-top:8px}
  .primary-navigation .search-field{flex:1;width:auto}
  .brand-name{font-size:27px}
  .brand-emblem img,.custom-logo{width:56px;height:56px}
  .topbar-left .topbar-school{display:none}
}
@media (max-width:600px){
  .quick-links,.card-grid,.card-grid-2,.card-grid-3,.gallery-grid,.steps,.timeline,.two-col-sections,.footer-grid{grid-template-columns:1fr}
  .hero-inner{padding-block:56px 60px}
  .hero-stats{gap:22px}
  .section{padding-block:40px}
  .entry{padding:20px}
  .notice-item{flex-direction:column;gap:2px}
  .forum-band-inner{flex-direction:column;align-items:flex-start}
}
@media (prefers-color-scheme:dark){
  :root{--bg:#141a28;--surface:#1d2639;--ink:#e8edf7;--muted:#a5b0c6;--border:#33405c}
  .brand-name a{color:#ff8296}
  .brand-line-3{color:var(--gold-2)}
  .post-card-title a{color:var(--ink)}
  .section-alt{background:#182034}
  .page-head h1,.entry-title,.section-head h2,.related h2,.widget-title,.steps h3{color:#f0d488}
  .entry-content h2,.entry-content h3{color:#f0d488}
  .search-field{background:#141a28;color:var(--ink)}
}