/*
Theme Name: Darwin STEM
Theme URI: https://sepa.org.vn
Author: SEPA - Darwin STEM
Author URI: https://sepa.org.vn
Description: Theme WordPress cho chương trình STEM Online của SEPA - Darwin STEM. Nền trắng ấm, xanh lá rừng chủ đạo, vàng gold điểm nhấn. Hỗ trợ menu, widget, logo tùy chỉnh, trang chủ landing.
Version: 1.0.0
Requires at least: 5.9
Tested up to: 6.6
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: darwin-stem
Tags: education, custom-logo, custom-menu, featured-images, threaded-comments, translation-ready
*/

:root{
  --ink:#0e4a14;        /* xanh lá rừng đậm - chủ đạo */
  --ink-soft:#3a5c40;
  --paper:#fbfaf4;      /* trắng ấm - nền */
  --paper-2:#eef2e6;    /* xanh lá cực nhạt */
  --clay:#e0aa2b;
  --clay-deep:#c08f1e;
  --leaf:#2f7a3f;
  --leaf-deep:#1f6030;
  --leaf-soft:#e2efe1;
  --sun:#f2ce3e;        /* vàng gold sáng - điểm nhấn */
  --sun-deep:#c99a10;
  --sun-soft:#fdf5d2;
  --line:#d8dcc8;
  --shadow:0 14px 40px -18px rgba(14,74,20,.32);
  --radius:16px;
  --wrap:1100px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Be Vietnam Pro',system-ui,-apple-system,sans-serif;
  color:var(--ink);background:var(--paper);
  line-height:1.65;-webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,.display{font-family:'Fraunces',Georgia,serif;line-height:1.15;font-weight:600;color:var(--ink)}
a{color:var(--leaf-deep);text-decoration:none}
a:hover{color:var(--ink)}
img{max-width:100%;height:auto}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.eyebrow{font-size:.74rem;letter-spacing:.22em;text-transform:uppercase;font-weight:700;color:var(--sun-deep)}

/* graph paper motif */
.graph{
  background-image:
    linear-gradient(rgba(14,74,20,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(14,74,20,.045) 1px,transparent 1px);
  background-size:26px 26px;
}

/* ---------- SKIP LINK (a11y) ---------- */
.skip-link{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:10px 16px;z-index:1000}
.skip-link:focus{left:8px;top:8px}

/* ---------- HEADER / NAV ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(251,250,244,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;min-height:66px;gap:20px}
.site-branding{display:flex;align-items:center;gap:12px}
.custom-logo{max-height:46px;width:auto}
.site-title{font-family:'Fraunces',serif;font-weight:700;font-size:1.15rem;color:var(--ink);position:relative}
.site-title a{color:var(--ink)}
.site-title .accent{color:var(--sun-deep)}
.site-title::after{content:"";position:absolute;left:0;bottom:-4px;width:100%;height:3px;border-radius:2px;
  background:linear-gradient(90deg,var(--leaf) 0 50%,var(--sun) 50% 100%)}
.site-description{font-size:.82rem;color:var(--ink-soft);margin-left:6px}

.main-nav ul{list-style:none;display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.main-nav a{display:inline-block;padding:.5rem .9rem;border-radius:999px;font-weight:600;font-size:.94rem;color:var(--ink);transition:.2s}
.main-nav a:hover,.main-nav .current-menu-item>a{background:var(--leaf-soft);color:var(--leaf-deep)}
.nav-toggle{display:none;background:var(--leaf-deep);color:#fff;border:none;border-radius:10px;padding:.5rem .8rem;font-size:1.1rem;cursor:pointer}

/* ---------- BUTTONS ---------- */
.btn{display:inline-block;font-weight:600;border-radius:999px;padding:.8rem 1.5rem;font-size:.98rem;transition:.2s;cursor:pointer;border:none}
.btn-primary{background:var(--leaf-deep);color:#fff!important;box-shadow:var(--shadow)}
.btn-primary:hover{background:var(--ink);color:#fff!important;transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--ink)!important;border:1.5px solid var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff!important}
.btn-gold{background:var(--sun);color:var(--ink)!important}
.btn-gold:hover{background:var(--sun-deep);color:#fff!important}

/* ---------- HERO (front page) ---------- */
.hero{background:var(--paper);overflow:hidden}
.hero .wrap{padding:72px 24px 60px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(2.2rem,5vw,3.6rem);letter-spacing:-.01em;margin:.5rem 0 1rem}
.hero h1 em{font-style:italic;color:var(--sun-deep);font-weight:600}
.hero .sub{font-size:1.12rem;color:var(--ink-soft);max-width:34ch;margin-bottom:1.8rem}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.count-card{position:relative;background:var(--ink);color:#fff;border-radius:22px;padding:34px 30px;box-shadow:var(--shadow);overflow:hidden;border-top:5px solid var(--sun)}
.count-card::before{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:22px 22px}
.count-card .big{font-family:'Fraunces',serif;font-size:5.4rem;font-weight:700;line-height:.9;color:var(--sun);position:relative}
.count-card .big small{display:block;font-size:1rem;font-weight:500;color:#fff;font-family:'Be Vietnam Pro',sans-serif;margin-top:.5rem}
.count-card .row{position:relative;display:flex;gap:20px;margin-top:22px;padding-top:20px;border-top:1px solid rgba(255,255,255,.16)}
.count-card .row div{flex:1}
.count-card .row b{font-family:'Fraunces',serif;font-size:1.5rem;color:var(--sun);display:block}
.count-card .row span{font-size:.82rem;color:rgba(255,255,255,.8)}

/* ---------- TRUST STRIP ---------- */
.trust{background:var(--ink);color:#fff;border-top:4px solid var(--sun);border-bottom:4px solid var(--leaf)}
.trust .wrap{display:flex;flex-wrap:wrap;justify-content:center;gap:14px 40px;padding:18px 24px;text-align:center}
.trust div{font-size:.92rem;font-weight:500}
.trust b{color:var(--sun)}

/* ---------- SECTIONS ---------- */
.section{padding:64px 0}
.section-alt{background:var(--paper-2)}
.sec-head{max-width:60ch;margin-bottom:38px}
.sec-head h2{font-size:clamp(1.6rem,3.4vw,2.4rem);margin:.5rem 0 .6rem}
.sec-head p{color:var(--ink-soft);font-size:1.04rem}

/* cards grid */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card .top-rule{height:4px;width:44px;border-radius:2px;margin-bottom:16px;background:var(--leaf)}
.card:nth-child(2) .top-rule{background:var(--sun)}
.card:nth-child(3) .top-rule{background:var(--ink)}
.card .tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:.3rem .7rem;border-radius:999px;margin-bottom:12px;background:var(--leaf-soft);color:var(--leaf-deep)}
.card:nth-child(2) .tag{background:var(--sun-soft);color:var(--sun-deep)}
.card h3{font-size:1.24rem;margin-bottom:.5rem}
.card .spirit{font-size:.88rem;font-weight:600;color:var(--sun-deep);margin-bottom:.6rem}
.card p{font-size:.96rem;color:var(--ink-soft)}

/* facts */
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:32px}
.fact{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;text-align:center;border-bottom:4px solid var(--leaf)}
.fact:nth-child(2){border-bottom-color:var(--sun)}
.fact:nth-child(3){border-bottom-color:var(--ink)}
.fact b{font-family:'Fraunces',serif;font-size:1.5rem;display:block;margin-bottom:.3rem}
.fact span{font-size:.9rem;color:var(--ink-soft)}

/* pricing */
.price-wrap{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.price{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.price .cap{padding:18px 22px;color:#fff;font-weight:600;font-size:1.05rem;background:var(--leaf)}
.price:nth-child(2) .cap{background:var(--sun-deep)}
.price:nth-child(3) .cap{background:var(--ink)}
.price .body{padding:22px}
.price .per{font-family:'Fraunces',serif;font-size:2.2rem;line-height:1}
.price .per small{font-size:.9rem;color:var(--ink-soft);font-family:'Be Vietnam Pro',sans-serif;font-weight:500}
.price ul{list-style:none;margin-top:14px;font-size:.94rem;color:var(--ink-soft)}
.price li{padding:6px 0;border-top:1px dashed var(--line);display:flex;justify-content:space-between}
.price li:first-child{border-top:none}
.price li b{color:var(--ink)}
.promo{margin-top:24px;background:var(--sun);border-radius:var(--radius);padding:20px 26px;display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.promo .tag{font-family:'Fraunces',serif;font-weight:700;font-size:1.15rem;color:var(--ink)}
.promo p{font-size:.98rem;color:var(--ink);flex:1;min-width:240px}

/* checklist on dark */
.section-dark{background:var(--ink);color:#fff}
.section-dark h2,.section-dark .sec-head h2{color:#fff}
.section-dark .sec-head p{color:rgba(255,255,255,.78)}
.checks{display:grid;grid-template-columns:1fr 1fr;gap:16px 34px}
.chk{display:flex;gap:14px;align-items:flex-start}
.chk .ic{flex-shrink:0;width:26px;height:26px;border-radius:7px;background:var(--leaf);display:grid;place-items:center;color:#fff;font-weight:700;margin-top:2px}
.chk:nth-child(2) .ic,.chk:nth-child(5) .ic{background:var(--sun);color:var(--ink)}
.chk:nth-child(3) .ic,.chk:nth-child(6) .ic{background:var(--leaf-deep)}
.chk p{font-size:1rem}.chk b{color:var(--sun)}

/* ---------- CONTENT (posts / pages) ---------- */
.content-area{padding:52px 0}
.content-area .wrap{display:grid;grid-template-columns:1fr 300px;gap:44px}
.content-area.full .wrap{grid-template-columns:1fr;max-width:800px}
article.entry{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:36px;margin-bottom:28px}
.entry-title{font-size:1.9rem;margin-bottom:.5rem}
.entry-title a{color:var(--ink)}
.entry-meta{font-size:.85rem;color:var(--ink-soft);margin-bottom:1rem}
.entry-content{font-size:1.04rem}
.entry-content p{margin-bottom:1.1rem}
.entry-content h2{font-size:1.5rem;margin:1.6rem 0 .7rem}
.entry-content h3{font-size:1.25rem;margin:1.3rem 0 .6rem}
.entry-content ul,.entry-content ol{margin:0 0 1.1rem 1.4rem}
.entry-content li{margin-bottom:.4rem}
.entry-content blockquote{border-left:4px solid var(--sun);background:var(--sun-soft);padding:14px 20px;margin:1.2rem 0;border-radius:0 10px 10px 0}
.entry-content img{border-radius:10px}
.entry-content a{text-decoration:underline}
.featured-thumb{border-radius:10px;margin-bottom:1.2rem;width:100%;object-fit:cover;max-height:420px}
.read-more{display:inline-block;margin-top:.6rem;font-weight:600;color:var(--leaf-deep)}
.sticky-badge{display:inline-block;font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;background:var(--sun);color:var(--ink);padding:.2rem .6rem;border-radius:999px;margin-bottom:.6rem}

/* ---------- SIDEBAR / WIDGETS ---------- */
.sidebar .widget{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin-bottom:22px}
.sidebar .widget-title{font-family:'Fraunces',serif;font-size:1.1rem;margin-bottom:.8rem;padding-bottom:.5rem;border-bottom:2px solid var(--sun)}
.sidebar ul{list-style:none}
.sidebar li{padding:.4rem 0;border-bottom:1px dashed var(--line)}
.sidebar li:last-child{border-bottom:none}
.sidebar a{color:var(--ink-soft)}
.sidebar a:hover{color:var(--leaf-deep)}

/* ---------- PAGINATION ---------- */
.pagination{display:flex;gap:8px;justify-content:center;margin-top:24px;flex-wrap:wrap}
.pagination .page-numbers{display:inline-block;padding:.5rem .9rem;border-radius:10px;background:#fff;border:1px solid var(--line);color:var(--ink);font-weight:600}
.pagination .page-numbers.current{background:var(--leaf-deep);color:#fff;border-color:var(--leaf-deep)}
.pagination a.page-numbers:hover{background:var(--leaf-soft)}

/* ---------- COMMENTS ---------- */
.comments-area{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;margin-top:10px}
.comment-list{list-style:none}
.comment-body{padding:14px 0;border-bottom:1px dashed var(--line)}
.comment-form input[type=text],.comment-form input[type=email],.comment-form input[type=url],.comment-form textarea{
  width:100%;padding:.7rem .9rem;border:1px solid var(--line);border-radius:10px;font-family:inherit;margin-bottom:.8rem}
.comment-form textarea{min-height:120px}

/* ---------- CTA ---------- */
.cta{background:var(--ink);color:#fff;text-align:center;border-top:5px solid var(--sun);position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:26px 26px}
.cta .wrap{position:relative;z-index:2;padding:60px 24px}
.cta h2{color:#fff;font-size:clamp(1.8rem,4vw,2.5rem);margin-bottom:.7rem}
.cta h2 em{font-style:normal;color:var(--sun)}
.cta p{color:rgba(255,255,255,.9);max-width:50ch;margin:0 auto 1.6rem;font-size:1.06rem}

/* ---------- FOOTER ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.72);
  border-top:4px solid;border-image:linear-gradient(90deg,var(--leaf),var(--sun)) 1}
.footer-widgets{display:grid;grid-template-columns:repeat(3,1fr);gap:34px;padding:44px 0}
.footer-widgets .widget-title{font-family:'Fraunces',serif;color:#fff;font-size:1.1rem;margin-bottom:.8rem}
.footer-widgets ul{list-style:none}
.footer-widgets li{padding:.3rem 0}
.footer-widgets a{color:rgba(255,255,255,.72)}
.footer-widgets a:hover{color:var(--sun)}
.site-info{text-align:center;padding:20px 24px;font-size:.86rem;border-top:1px solid rgba(255,255,255,.12)}
.site-info b{color:var(--sun)}

/* ---------- RESPONSIVE ---------- */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .count-card{order:-1}
  .grid-3,.facts,.price-wrap,.checks,.footer-widgets{grid-template-columns:1fr}
  .content-area .wrap{grid-template-columns:1fr}
  .main-nav{display:none;position:absolute;top:66px;left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);padding:12px 24px}
  .main-nav.open{display:block}
  .main-nav ul{flex-direction:column;align-items:stretch;gap:2px}
  .nav-toggle{display:inline-block}
}
@media(max-width:520px){
  .hero .wrap{padding:48px 22px 40px}
  .grid-3{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto}}

/* WP core alignment helpers */
.aligncenter{display:block;margin:1rem auto}
.alignleft{float:left;margin:0 1.4rem 1rem 0}
.alignright{float:right;margin:0 0 1rem 1.4rem}
.wp-caption{max-width:100%}
.wp-caption-text{font-size:.85rem;color:var(--ink-soft);text-align:center;margin-top:.4rem}
.screen-reader-text{position:absolute!important;clip:rect(1px,1px,1px,1px);width:1px;height:1px;overflow:hidden}