/*
Theme Name:   Science Vietnam
Theme URI:    https://sciencevietnam.com
Description:  Standalone theme cho Science Vietnam — trang tin & thư viện kiến thức ngành thực phẩm. Giao diện editorial B2B, nhúng sẵn, không cần page builder.
Author:       Science Vietnam
Author URI:   https://sciencevietnam.com
Version:      1.0.0
Requires at least: 6.0
Tested up to: 6.5
Requires PHP: 7.4
License:      GNU General Public License v3 or later
License URI:  https://www.gnu.org/licenses/gpl-3.0.html
Text Domain:  science-vietnam
*/

/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root{
  --bg:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --border:#e5e7eb;
  --accent:#0f766e;
  --accent-dark:#0c5d56;
  --accent-light:#ecfdf5;
  --navy:#0f172a;
  --soft:#f8fafc;
  --maxw:1240px;
  --radius:10px;
  --font:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* RESET & BASE */
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;height:auto;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
ul{list-style:none;}

/* Section rhythm */
.section{padding:56px 0;}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:28px;border-bottom:2px solid var(--navy);padding-bottom:12px;}
.section-head h2{font-size:1.6rem;font-weight:800;letter-spacing:-.02em;}
.section-head .lede{color:var(--muted);font-size:.95rem;max-width:520px;}
.section-link{color:var(--accent);font-weight:600;font-size:.9rem;white-space:nowrap;}
.section-link:hover{text-decoration:underline;}

/* Image placeholders */
.ph{border-radius:var(--radius);background:linear-gradient(135deg,#0f766e 0%,#0f172a 100%);background-size:cover;background-position:center;}
.ph-2{background:linear-gradient(135deg,#34d399 0%,#0f766e 100%);}
.ph-3{background:linear-gradient(135deg,#0ea5a4 0%,#155e75 100%);}
.ph-4{background:linear-gradient(135deg,#1e293b 0%,#0f766e 100%);}

/* Badge */
.badge{display:inline-block;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);background:var(--accent-light);padding:4px 10px;border-radius:4px;}
.badge.dark{background:var(--navy);color:#fff;}

/* Buttons */
.btn{display:inline-block;font-weight:600;font-size:.9rem;cursor:pointer;border:none;padding:11px 20px;border-radius:8px;background:var(--accent);color:#fff;transition:background .18s ease,transform .18s ease;}
.btn:hover{background:var(--accent-dark);transform:translateY(-1px);color:#fff;}
.btn-outline{background:transparent;color:var(--accent);border:1.5px solid var(--accent);}
.btn-outline:hover{background:var(--accent-light);}

/* TOP BAR */
.topbar{background:var(--navy);color:#cbd5e1;font-size:.8rem;border-bottom:1px solid #1e293b;}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:38px;}
.topbar .brand-tag b{color:#fff;}
.topbar nav{display:flex;gap:22px;}
.topbar nav a{color:#cbd5e1;transition:color .15s;}
.topbar nav a:hover{color:#fff;}

/* MASTHEAD */
.masthead{border-bottom:1px solid var(--border);padding:24px 0;}
.masthead .container{display:flex;align-items:center;gap:28px;}
.logo .logo-text{font-size:2rem;font-weight:900;letter-spacing:-.03em;line-height:1;}
.logo .logo-text .vn{color:var(--accent);}
.logo .tagline{color:var(--muted);font-size:.82rem;margin-top:4px;}
.masthead-actions{margin-left:auto;display:flex;align-items:center;gap:14px;}
.search-box{display:flex;align-items:center;border:1px solid var(--border);border-radius:8px;padding:8px 12px;background:var(--soft);min-width:230px;}
.search-box svg{width:16px;height:16px;color:var(--muted);flex:0 0 auto;}
.search-box input{border:none;background:none;outline:none;font-size:.9rem;width:100%;padding-left:8px;font-family:var(--font);}

/* MAIN NAV */
.mainnav{position:sticky;top:0;z-index:100;background:#fff;border-bottom:2px solid var(--navy);box-shadow:0 1px 0 rgba(0,0,0,.02);}
.mainnav .container{display:flex;align-items:center;gap:6px;min-height:52px;}
.mainnav ul{display:flex;gap:2px;flex-wrap:wrap;margin:0;}
.mainnav ul a{display:block;padding:10px 14px;font-weight:600;font-size:.92rem;border-radius:6px;transition:color .15s,background .15s;}
.mainnav ul a:hover{color:var(--accent);background:var(--accent-light);}
.mainnav ul .current-menu-item > a{color:var(--accent);}
.hamburger{display:none;margin-left:auto;background:none;border:none;cursor:pointer;padding:8px;}
.hamburger span{display:block;width:22px;height:2px;background:var(--text);margin:4px 0;transition:.2s;}

/* Topic nav */
.topicnav{background:var(--soft);border-bottom:1px solid var(--border);}
.topicnav .container{display:flex;gap:18px;overflow-x:auto;padding-top:10px;padding-bottom:10px;}
.topicnav a{font-size:.82rem;font-weight:500;color:var(--muted);white-space:nowrap;transition:color .15s;}
.topicnav a:hover{color:var(--accent);}

/* HERO */
.hero{padding-top:40px;}
.hero-grid{display:grid;grid-template-columns:1.7fr 1fr;gap:32px;}
.lead-story .lead-img{height:360px;display:block;}
.lead-story h1{font-size:2.2rem;font-weight:800;letter-spacing:-.025em;line-height:1.15;margin:16px 0 12px;}
.lead-story h1 a:hover{color:var(--accent);}
.lead-story .excerpt{color:#374151;font-size:1.02rem;margin-bottom:12px;}
.byline{color:var(--muted);font-size:.82rem;font-weight:500;}
.byline .dot{margin:0 6px;}
.side-stories{display:flex;flex-direction:column;gap:18px;}
.side-story{display:grid;grid-template-columns:96px 1fr;gap:14px;padding-bottom:18px;border-bottom:1px solid var(--border);}
.side-story:last-child{border-bottom:none;}
.side-story .ph{height:72px;}
.side-story h3{font-size:1rem;font-weight:700;line-height:1.3;margin-top:6px;letter-spacing:-.01em;}
.side-story h3 a:hover{color:var(--accent);}
.side-story .badge{font-size:.65rem;padding:2px 7px;}

/* LATEST + SIDEBAR */
.latest-grid{display:grid;grid-template-columns:1fr 340px;gap:48px;}
.article-card{display:grid;grid-template-columns:220px 1fr;gap:20px;padding:22px 0;border-bottom:1px solid var(--border);}
.article-card:first-child{padding-top:0;}
.article-card .ph{height:140px;}
.article-card h3{font-size:1.2rem;font-weight:700;letter-spacing:-.015em;line-height:1.3;margin:8px 0;}
.article-card h3 a:hover{color:var(--accent);}
.article-card .excerpt{color:var(--muted);font-size:.92rem;margin-bottom:8px;}

/* Sidebar */
.sidebar .widget{margin-bottom:36px;}
.newsletter-box{background:var(--accent-light);border:1px solid #a7f3d0;border-radius:var(--radius);padding:24px;}
.newsletter-box h3{font-size:1.15rem;font-weight:800;margin-bottom:8px;letter-spacing:-.01em;}
.newsletter-box p{color:#374151;font-size:.9rem;margin-bottom:14px;}
.newsletter-box input[type=email]{width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:8px;font-size:.9rem;margin-bottom:12px;font-family:var(--font);}
.checks{display:flex;flex-direction:column;gap:8px;margin-bottom:14px;}
.checks label{display:flex;align-items:center;gap:8px;font-size:.86rem;color:#374151;cursor:pointer;}
.checks input{accent-color:var(--accent);width:16px;height:16px;}
.newsletter-box .btn{width:100%;}
.widget-title{font-size:.85rem;font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:var(--navy);padding-bottom:10px;border-bottom:2px solid var(--accent);margin-bottom:14px;}
.popular-list li{display:flex;gap:14px;padding:13px 0;border-bottom:1px solid var(--border);}
.popular-list li:last-child{border-bottom:none;}
.popular-list .rank{font-size:1.4rem;font-weight:900;color:var(--accent);line-height:1;flex:0 0 auto;width:26px;}
.popular-list a{font-size:.92rem;font-weight:600;line-height:1.35;}
.popular-list a:hover{color:var(--accent);}

/* CATEGORIES */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.cat-card{border:1px solid var(--border);border-radius:var(--radius);padding:22px;background:#fff;transition:border-color .18s,box-shadow .18s,transform .18s;display:flex;flex-direction:column;}
.cat-card:hover{border-color:var(--accent);box-shadow:0 10px 24px rgba(15,118,110,.10);transform:translateY(-3px);}
.cat-card h3{font-size:1.15rem;font-weight:800;letter-spacing:-.01em;}
.cat-card p{color:var(--muted);font-size:.86rem;margin:8px 0 14px;flex:1;}
.cat-card .meta{display:flex;justify-content:space-between;align-items:center;}
.cat-card .count{font-size:.78rem;color:var(--muted);font-weight:600;}
.cat-card .explore{color:var(--accent);font-weight:700;font-size:.85rem;}
.cat-card:hover .explore{text-decoration:underline;}

/* BRANDS */
.brands.section{background:var(--soft);}
.brand-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.brand-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;transition:border-color .18s,transform .18s;}
.brand-card:hover{border-color:var(--accent);transform:translateY(-3px);}
.brand-logo{width:52px;height:52px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-weight:900;font-size:1.3rem;color:#fff;margin-bottom:14px;background:linear-gradient(135deg,#0f766e,#0f172a);}
.brand-card h3{font-size:1.1rem;font-weight:800;}
.brand-card .type{font-size:.74rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--accent);margin:4px 0 10px;}
.brand-card p{color:var(--muted);font-size:.85rem;margin-bottom:14px;}

/* LIBRARY */
.lib-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.lib-card{border-left:3px solid var(--accent);background:var(--accent-light);border-radius:8px;padding:20px;transition:transform .18s;}
.lib-card:hover{transform:translateY(-3px);}
.lib-card h3{font-size:1.02rem;font-weight:800;margin-bottom:8px;}
.lib-card p{color:#374151;font-size:.85rem;}

/* READING + EVENTS */
.three-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.read-card{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:box-shadow .18s,transform .18s;}
.read-card:hover{box-shadow:0 10px 24px rgba(0,0,0,.07);transform:translateY(-3px);}
.read-card .ph{height:130px;border-radius:0;}
.read-card .body{padding:18px;}
.read-card .body h3{font-size:1.04rem;font-weight:700;line-height:1.35;margin:8px 0;}
.read-card .body h3 a:hover{color:var(--accent);}
.read-card .source{font-size:.78rem;color:var(--muted);font-weight:600;}
.event-card{border:1px solid var(--border);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column;transition:border-color .18s,transform .18s;}
.event-card:hover{border-color:var(--accent);transform:translateY(-3px);}
.event-card .etype{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--accent);}
.event-card .date{font-size:.85rem;font-weight:700;color:var(--navy);margin:6px 0 10px;}
.event-card h3{font-size:1.12rem;font-weight:800;letter-spacing:-.01em;margin-bottom:8px;}
.event-card p{color:var(--muted);font-size:.88rem;margin-bottom:16px;flex:1;}

/* FOOTER */
.site-footer{background:var(--navy);color:#cbd5e1;padding:56px 0 0;}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.4fr;gap:36px;padding-bottom:40px;}
.site-footer .logo-text{font-size:1.5rem;font-weight:900;color:#fff;letter-spacing:-.02em;}
.site-footer .logo-text .vn{color:#34d399;}
.site-footer .blurb{font-size:.86rem;margin-top:12px;max-width:280px;}
.site-footer h4{color:#fff;font-size:.82rem;text-transform:uppercase;letter-spacing:.07em;margin-bottom:16px;}
.site-footer ul li{margin-bottom:10px;}
.site-footer ul a{font-size:.88rem;color:#cbd5e1;transition:color .15s;}
.site-footer ul a:hover{color:#34d399;}
.footer-news input{width:100%;padding:11px 12px;border:none;border-radius:8px;font-size:.88rem;margin-bottom:12px;font-family:var(--font);}
.footer-news .btn{width:100%;}
.footer-bottom{border-top:1px solid #1e293b;padding:20px 0;text-align:center;font-size:.82rem;color:#94a3b8;}

/* SINGLE / PAGE / ARCHIVE */
.content-area{padding:48px 0;}
.post-single{max-width:760px;margin:0 auto;}
.post-single .badge{margin-bottom:14px;}
.post-single h1{font-size:2.2rem;font-weight:800;letter-spacing:-.02em;line-height:1.2;margin-bottom:12px;}
.post-single .byline{margin-bottom:24px;}
.post-single .featured{height:380px;margin-bottom:28px;}
.post-content{font-size:1.05rem;line-height:1.75;}
.post-content p,.post-content ul,.post-content ol,.post-content h2,.post-content h3,.post-content blockquote,.post-content figure{margin-bottom:1.1em;}
.post-content h2{font-size:1.5rem;font-weight:800;margin-top:1.4em;letter-spacing:-.01em;}
.post-content h3{font-size:1.2rem;font-weight:700;margin-top:1.2em;}
.post-content ul,.post-content ol{padding-left:1.4em;}
.post-content li{margin-bottom:.4em;}
.post-content a{color:var(--accent);text-decoration:underline;}
.post-content img{border-radius:var(--radius);margin:1.2em 0;}
.post-content blockquote{border-left:4px solid var(--accent);padding-left:18px;color:#374151;font-style:italic;}
.archive-head{margin-bottom:32px;border-bottom:2px solid var(--navy);padding-bottom:14px;}
.archive-head h1{font-size:1.8rem;font-weight:800;letter-spacing:-.02em;}
.archive-head .count{color:var(--muted);font-size:.9rem;margin-top:4px;}
.archive-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.pagination{margin-top:40px;display:flex;gap:8px;flex-wrap:wrap;justify-content:center;}
.pagination .page-numbers{display:inline-block;padding:9px 14px;border:1px solid var(--border);border-radius:8px;font-weight:600;font-size:.9rem;color:var(--text);}
.pagination .page-numbers.current{background:var(--accent);color:#fff;border-color:var(--accent);}
.pagination a.page-numbers:hover{border-color:var(--accent);color:var(--accent);}

/* WP core helpers */
.screen-reader-text{position:absolute!important;clip:rect(1px,1px,1px,1px);width:1px;height:1px;overflow:hidden;}
.aligncenter{margin-left:auto;margin-right:auto;}
.aligncenter{display:block;margin:1em auto;}
.alignleft{float:left;margin:0 1.2em 1em 0;}
.alignright{float:right;margin:0 0 1em 1.2em;}
.wp-caption{max-width:100%;}
.wp-caption-text{font-size:.82rem;color:var(--muted);text-align:center;margin-top:6px;}
.sticky,.gallery-caption,.bypostauthor{}

/* RESPONSIVE */
@media(max-width:1024px){
  .cat-grid,.brand-grid,.lib-grid{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:repeat(2,1fr);}
  .archive-grid{grid-template-columns:repeat(2,1fr);}
}
@media(max-width:860px){
  .hero-grid{grid-template-columns:1fr;}
  .latest-grid{grid-template-columns:1fr;gap:36px;}
  .lead-story .lead-img{height:260px;}
  .mainnav ul{display:none;position:absolute;top:52px;left:0;right:0;background:#fff;flex-direction:column;border-bottom:2px solid var(--navy);padding:8px 16px 16px;box-shadow:0 12px 24px rgba(0,0,0,.08);}
  .mainnav ul.open{display:flex;}
  .mainnav ul a{padding:12px 8px;border-bottom:1px solid var(--border);border-radius:0;}
  .hamburger{display:block;}
  .three-grid{grid-template-columns:1fr;}
}
@media(max-width:600px){
  .topbar .brand-tag{display:none;}
  .masthead .container{flex-wrap:wrap;gap:14px;}
  .masthead-actions{width:100%;margin-left:0;}
  .search-box{flex:1;min-width:0;}
  .article-card{grid-template-columns:1fr;}
  .article-card .ph{height:180px;}
  .side-story{grid-template-columns:80px 1fr;}
  .cat-grid,.brand-grid,.lib-grid,.footer-grid,.archive-grid{grid-template-columns:1fr;}
  .lead-story h1{font-size:1.7rem;}
  .section-head{flex-direction:column;}
}

a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--accent);outline-offset:2px;}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto;}}

/* Fix mobile: tránh chữ tiêu đề bài viết sát viền */
@media(max-width:600px){
  .post-single{padding-left:20px;padding-right:20px;}
  .post-single h1{font-size:1.6rem;}
}