/*
Theme Name: Trí Việt
Description: Giao diện mới cho Gia Sư Trí Việt — Tiến Bộ Mỗi Ngày. Nhẹ, không jQuery, ưu tiên điện thoại.
Version: 1.0.0
Requires PHP: 8.0
Text Domain: triviet
*/

/* Font tự host (OFL), rút gọn Latin + tiếng Việt */
@font-face { font-family: "Be Vietnam Pro"; font-style: normal; font-weight: 400; font-display: swap; src: url("assets/fonts/be-vietnam-pro-Regular.woff2") format("woff2"); }
@font-face { font-family: "Be Vietnam Pro"; font-style: normal; font-weight: 500; font-display: swap; src: url("assets/fonts/be-vietnam-pro-Medium.woff2") format("woff2"); }
@font-face { font-family: "Be Vietnam Pro"; font-style: normal; font-weight: 600; font-display: swap; src: url("assets/fonts/be-vietnam-pro-SemiBold.woff2") format("woff2"); }
@font-face { font-family: "Be Vietnam Pro"; font-style: normal; font-weight: 700; font-display: swap; src: url("assets/fonts/be-vietnam-pro-Bold.woff2") format("woff2"); }
@font-face { font-family: "Be Vietnam Pro"; font-style: normal; font-weight: 800; font-display: swap; src: url("assets/fonts/be-vietnam-pro-ExtraBold.woff2") format("woff2"); }

:root {
	--teal: #0E9F84;
	--teal-d: #0B7F6A;
	--teal-50: #E9F7F3;
	--teal-100: #CDEEE5;
	--ink: #1C2B3A;
	--ink-2: #3A4A5A;
	--muted: #5B6B7A;
	--sun: #F4A62A;
	--sun-d: #D98A0F;
	--sun-50: #FEF5E6;
	--line: #E3E9EE;
	--soft: #F5F8F7;
	--white: #fff;
	--radius: 14px;
	--shadow: 0 1px 2px rgba(28, 43, 58, .06), 0 8px 24px rgba(28, 43, 58, .08);
	--font: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 90px; }
body { margin: 0; font-family: var(--font); font-size: 16px; line-height: 1.65; color: var(--ink-2); background: var(--white); }
img { max-width: 100%; height: auto; }
a { color: var(--teal-d); text-decoration: none; }
a:hover { color: var(--teal); }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.25; font-weight: 700; margin: 0 0 .5em; }
p { margin: 0 0 1em; }
.ic { width: 1.1em; height: 1.1em; flex: none; vertical-align: -.15em; }
.wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: #fff; padding: 8px 14px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }
.center { text-align: center; }
:focus-visible { outline: 3px solid var(--sun); outline-offset: 2px; }

/* Nút */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5em; padding: .72em 1.25em; border-radius: 10px; font: 600 15px/1.2 var(--font); border: 2px solid transparent; cursor: pointer; transition: background .15s, color .15s, border-color .15s, transform .15s; white-space: nowrap; }
.btn:active { transform: translateY(1px); }
.btn-lg { padding: .9em 1.5em; font-size: 16px; }
.btn-block { display: flex; width: 100%; }
.btn-primary { background: var(--sun); color: var(--ink); }
.btn-primary:hover { background: var(--sun-d); color: var(--ink); }
.btn-ghost { background: var(--white); color: var(--teal-d); border-color: var(--teal-100); }
.btn-ghost:hover { border-color: var(--teal); color: var(--teal-d); }
.btn-light { background: #fff; color: var(--teal-d); }
.btn-light:hover { background: var(--sun-50); color: var(--teal-d); }
.btn-outline-light { color: #fff; border-color: rgba(255, 255, 255, .6); }
.btn-outline-light:hover { color: #fff; border-color: #fff; background: rgba(255, 255, 255, .08); }

/* Thanh trên cùng + header */
.topbar { background: var(--ink); color: #C9D6E0; font-size: 13px; }
.topbar-in { display: flex; gap: 24px; padding-top: 7px; padding-bottom: 7px; }
.topbar a { color: #C9D6E0; }
.topbar a:hover { color: #fff; }
.topbar a:last-child { margin-left: auto; }
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255, 255, 255, .97); border-bottom: 1px solid var(--line); backdrop-filter: saturate(1.4) blur(8px); }
.header-in { display: flex; align-items: center; gap: 20px; min-height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; flex: none; color: var(--ink); }
.brand img { width: 44px; height: 44px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-text em { font-style: normal; font-size: 10px; font-weight: 600; letter-spacing: .24em; text-transform: uppercase; color: var(--teal); }
.brand-text strong { font-size: 22px; font-weight: 800; color: var(--ink); letter-spacing: -.01em; }
.brand-text small { font-size: 9.5px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin-top: 2px; }
.brand-light strong { color: #fff; }
.brand-light em { color: #5FD3B8; }
.brand-light small { color: #C9D6E0; }

.nav { flex: 1; }
.menu, .menu ul { list-style: none; margin: 0; padding: 0; }
.menu { display: flex; flex-wrap: nowrap; justify-content: center; }
.menu > li { position: relative; display: inline-flex; align-items: center; }
.menu > li > a { display: block; padding: 24px 9px; font-weight: 600; font-size: 15px; color: var(--ink); white-space: nowrap; }
.menu > li > a:hover, .menu > .current-menu-item > a, .menu > .current-menu-ancestor > a { color: var(--teal-d); }
.menu .sub-menu { position: absolute; top: 100%; left: 0; min-width: 240px; background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); padding: 8px; opacity: 0; visibility: hidden; transform: translateY(6px); transition: .15s; }
.menu .sub-menu .sub-menu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: 0; padding: 0 0 6px 10px; min-width: 0; }
.menu li:hover > .sub-menu, .menu li:focus-within > .sub-menu { opacity: 1; visibility: visible; transform: none; }
.menu .sub-menu a { display: block; padding: 7px 10px; border-radius: 8px; color: var(--ink-2); font-size: 14.5px; }
.menu .sub-menu a:hover { background: var(--teal-50); color: var(--teal-d); }
.menu .sub-menu > li > a:not([href]), .menu .sub-menu > .menu-item-has-children > a { font-weight: 700; color: var(--ink); }
.menu > li:nth-child(3) > .sub-menu, .menu > li:nth-child(4) > .sub-menu { display: grid; grid-template-columns: repeat(4, minmax(190px, 1fr)); gap: 0 8px; min-width: 820px; }
.menu > li:nth-child(4) > .sub-menu { grid-template-columns: repeat(2, minmax(220px, 1fr)); min-width: 480px; }
/* menu xổ rộng: canh giữa theo cả thanh menu để không tràn mép phải (06/11/2026) */
@media (min-width: 961px) {
.menu { position: relative; }
.menu > li:nth-child(3), .menu > li:nth-child(4) { position: static; }
.menu > li:nth-child(3) > .sub-menu, .menu > li:nth-child(4) > .sub-menu { left: 50%; transform: translate(-50%, 6px); }
.menu > li:nth-child(3):hover > .sub-menu, .menu > li:nth-child(3):focus-within > .sub-menu, .menu > li:nth-child(4):hover > .sub-menu, .menu > li:nth-child(4):focus-within > .sub-menu { transform: translate(-50%, 0); }
}
.sub-toggle { display: none; }
.nav-cta { display: none; }
.icon-btn.nav-close { display: none; }
.header-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.hotline { display: flex; align-items: center; gap: 10px; padding: 6px 14px 6px 8px; border-radius: 12px; background: var(--teal-50); color: var(--teal-d); font-weight: 800; font-size: 17px; line-height: 1.15; }
.hotline .ic { width: 34px; height: 34px; padding: 8px; border-radius: 50%; background: var(--teal); color: #fff; }
.hotline small { display: block; font-size: 11px; font-weight: 500; color: var(--muted); }
.icon-btn { display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 10px; border: 1px solid var(--line); background: #fff; color: var(--ink); cursor: pointer; }
.icon-btn .ic { width: 20px; height: 20px; }
.nav-toggle { display: none; }
.search-panel { border-top: 1px solid var(--line); padding: 14px 0; background: #fff; }
.search-form { display: flex; gap: 8px; }
.search-form label { flex: 1; }
.search-field, input[type=text], input[type=tel], input[type=email], input[type=search], select, textarea { width: 100%; font: 15px/1.4 var(--font); color: var(--ink); padding: 11px 13px; border: 1.5px solid var(--line); border-radius: 10px; background: #fff; transition: border-color .15s; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--teal); box-shadow: 0 0 0 3px var(--teal-50); }

/* Hero */
.hero { background: linear-gradient(180deg, var(--teal-50), #fff 85%); padding: 56px 0 24px; position: relative; overflow: hidden; }
.hero::before { content: ""; position: absolute; right: -120px; top: -120px; width: 380px; height: 380px; border-radius: 50%; background: radial-gradient(circle, rgba(244, 166, 42, .22), transparent 70%); }
.hero-in { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; position: relative; }
.eyebrow { font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--teal-d); margin-bottom: 12px; }
.hero h1 { font-size: clamp(28px, 3.7vw, 46px); font-weight: 800; letter-spacing: -.02em; margin-bottom: 18px; }
.hl { white-space: nowrap; color: var(--teal-d); background: linear-gradient(transparent 68%, rgba(244, 166, 42, .35) 0); }
.lead { font-size: 18px; color: var(--ink-2); max-width: 36em; }
.ticks { list-style: none; padding: 0; margin: 0 0 28px; display: grid; gap: 8px; }
.ticks li { display: flex; gap: 10px; align-items: flex-start; font-weight: 500; color: var(--ink); }
.ticks .ic { color: #fff; background: var(--teal); border-radius: 50%; padding: 3px; width: 20px; height: 20px; margin-top: 3px; }
.hero-btns { display: flex; flex-wrap: wrap; gap: 12px; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 48px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.stats div { padding: 20px; text-align: center; border-left: 1px solid var(--line); }
.stats div:first-child { border-left: 0; }
.stats strong { display: block; font-size: 26px; font-weight: 800; color: var(--ink); }
.stats span { font-size: 14px; color: var(--muted); }

/* Form */
.form-card { background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); padding: 26px; display: grid; gap: 12px; }
.form-card h3, .form-title { font-size: 22px; font-weight: 700; color: var(--ink); line-height: 1.25; margin: 0; }
.form-sub { margin: -6px 0 4px; color: var(--muted); font-size: 14.5px; }
.form-card label { display: grid; gap: 5px; font-size: 13.5px; font-weight: 600; color: var(--ink); }
.form-card .row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-note { margin: 0; text-align: center; font-size: 14px; color: var(--muted); }
.form-note a { font-weight: 700; }
.hp { position: absolute; left: -9999px; }
.form-ok { text-align: center; justify-items: center; }
.form-ok .ic { width: 52px; height: 52px; padding: 12px; border-radius: 50%; background: var(--teal); color: #fff; }

/* Section */
.section { padding: 72px 0; }
.section-alt { background: var(--soft); }
.sec-head { max-width: 680px; margin: 0 0 32px; }
.sec-head h2 { font-size: clamp(26px, 3vw, 36px); font-weight: 800; letter-spacing: -.01em; }
.sec-head p:last-child { color: var(--muted); margin: 0; }
.sec-head-row { max-width: none; display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
.more { font-weight: 600; display: inline-flex; gap: 6px; align-items: center; }

.levels { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.level { border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; background: #fff; border-top: 4px solid var(--teal); }
.level:nth-child(2) { border-top-color: var(--sun); }
.level:nth-child(3) { border-top-color: var(--ink); }
.level h3 { font-size: 22px; }
.level h3 a { display: flex; align-items: baseline; gap: 10px; color: var(--ink); }
.level h3 a:hover { color: var(--teal-d); }
.level h3 span { font-size: 14px; font-weight: 600; color: var(--muted); }
.level p { color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { padding: 6px 12px; border-radius: 999px; background: var(--teal-50); color: var(--teal-d); font-weight: 600; font-size: 14px; }
.chip:hover { background: var(--teal); color: #fff; }

.subjects { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.subject { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 16px 18px; border-radius: 12px; background: #fff; border: 1px solid var(--line); color: var(--ink); font-weight: 600; }
.subject .ic { color: var(--teal); transition: transform .15s; }
.subject:hover { border-color: var(--teal); color: var(--teal-d); }
.subject:hover .ic { transform: translateX(3px); }

.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: s; }
.steps li { position: relative; padding: 24px; border-radius: var(--radius); background: var(--soft); }
.steps .num { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 12px; background: var(--ink); color: #fff; font-weight: 800; margin-bottom: 14px; }
.steps li:nth-child(4) .num { background: var(--sun); color: var(--ink); }
.steps h3 { font-size: 18px; }
.steps p { margin: 0; font-size: 15px; color: var(--muted); }

.tutors { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 28px; }
.tutor { display: flex; gap: 16px; align-items: center; padding: 20px; background: #fff; border-radius: var(--radius); border: 1px solid var(--line); }
.tutor img { width: 88px; height: 88px; border-radius: 50%; object-fit: cover; border: 3px solid var(--teal-50); flex: none; }
.tutor h3 { font-size: 18px; margin: 0; }
.tutor .tag { display: inline-block; margin: 4px 0 6px; padding: 2px 10px; border-radius: 999px; background: var(--sun-50); color: #8A5600; font-size: 13px; font-weight: 600; }
.tutor p { margin: 0; font-size: 14.5px; color: var(--muted); }

/* Thẻ bài viết */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: box-shadow .15s, transform .15s; }
.card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.card-img { display: block; aspect-ratio: 16 / 9; background: var(--teal-50); overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; }
.card-ph { display: grid; place-items: center; height: 100%; font-weight: 700; color: var(--teal-d); }
.card-body { padding: 18px 20px 20px; display: flex; flex-direction: column; flex: 1; }
.card-cat { font-size: 12.5px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--teal-d); margin-bottom: 6px; }
.card-title { font-size: 18px; margin: 0 0 8px; }
.card-title a { color: var(--ink); }
.card-title a:hover { color: var(--teal-d); }
.card-ex { font-size: 15px; color: var(--muted); margin-bottom: 12px; }
.meta { margin: auto 0 0; font-size: 13px; color: var(--muted); }

.tutor-cta { display: grid; grid-template-columns: 1.4fr 1fr; gap: 32px; align-items: center; background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 36px; }
.tutor-cta h2 { font-size: 28px; }
.tutor-cta p:last-child { margin: 0; color: var(--muted); }
.cta-btns { display: flex; flex-wrap: wrap; gap: 12px; justify-content: flex-end; }

/* Dải kêu gọi + chân trang */
.cta-band { background: var(--teal-d); background-image: radial-gradient(circle at 92% 20%, rgba(244, 166, 42, .35), transparent 30%); color: #E6F5F0; }
.cta-in { display: grid; grid-template-columns: 1.5fr 1fr; gap: 24px; align-items: center; padding-top: 44px; padding-bottom: 44px; }
.cta-band h2 { color: #fff; font-size: clamp(22px, 2.6vw, 30px); }
.cta-band p { margin: 0; }
.site-footer { background: var(--ink); color: #B8C6D2; font-size: 15px; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1.2fr 1fr 1fr; gap: 36px; padding-top: 56px; padding-bottom: 40px; }
.site-footer h3 { color: #fff; font-size: 16px; margin-bottom: 14px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.site-footer a { color: #DCE6EE; }
.site-footer a:hover { color: var(--sun); }
.f-about p { margin-top: 16px; }
.f-contact li { display: flex; gap: 10px; }
.f-contact .ic { color: #5FD3B8; margin-top: 4px; }
.f-bottom { border-top: 1px solid rgba(255, 255, 255, .1); padding-top: 18px; padding-bottom: 18px; font-size: 13.5px; }
.mobile-bar { display: none; }

/* Trang trong: bài viết, trang, chuyên mục */
.page-head { background: linear-gradient(180deg, var(--teal-50), #fff); padding: 36px 0 28px; }
.page-head h1 { font-size: clamp(26px, 3.4vw, 40px); font-weight: 800; letter-spacing: -.01em; max-width: 24em; }
.page-head .meta { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px 14px; }
.page-head .desc { color: var(--muted); max-width: 46em; }
.crumbs { font-size: 13.5px; color: var(--muted); margin-bottom: 12px; }
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--teal-d); }
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 48px; padding-top: 36px; padding-bottom: 72px; align-items: start; }
.layout-full { grid-template-columns: minmax(0, 1fr); max-width: 860px; }
.aside { position: sticky; top: 96px; display: grid; gap: 20px; }
.aside-box { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.aside-box h3 { font-size: 16px; }
.aside-box ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.aside-box li a { color: var(--ink); font-weight: 500; font-size: 15px; line-height: 1.4; display: block; }
.aside-box li a:hover { color: var(--teal-d); }
.feat-img { margin: 0 0 28px; border-radius: var(--radius); overflow: hidden; }
.feat-img img { display: block; width: 100%; }

.entry { font-size: 17px; line-height: 1.75; color: var(--ink-2); overflow-wrap: break-word; }
.entry > * { max-width: 100%; }
.entry h2 { font-size: 26px; margin: 1.6em 0 .6em; padding-left: 14px; border-left: 4px solid var(--teal); }
.entry h3 { font-size: 21px; margin: 1.4em 0 .5em; }
.entry h4 { font-size: 18px; margin: 1.2em 0 .4em; }
.entry a { text-decoration: underline; text-decoration-color: var(--teal-100); text-underline-offset: 3px; }
.entry a:hover { text-decoration-color: var(--teal); }
.entry ul, .entry ol { padding-left: 1.4em; }
.entry li { margin-bottom: .4em; }
.entry img { border-radius: 10px; }
.entry figure { margin: 1.5em 0; }
.entry figcaption, .entry .wp-caption-text { font-size: 14px; color: var(--muted); text-align: center; margin-top: 8px; }
.entry .wp-caption, .entry figure { max-width: 100%; }
.entry p > img:not(.emoji):not(.alignleft):not(.alignright), .entry > img:not(.emoji), .entry div > img:not(.emoji), .entry figure > img, .entry figure > a > img, .entry p > a > img:not(.emoji) { display: block; margin-left: auto; margin-right: auto; }
.entry figure.aligncenter, .entry .wp-caption, .entry .wp-block-image { margin-left: auto; margin-right: auto; }
.entry .aligncenter { display: block; margin-left: auto; margin-right: auto; }
.entry .alignleft { float: left; margin: .3em 1.5em 1em 0; }
.entry .alignright { float: right; margin: .3em 0 1em 1.5em; }
.entry blockquote { margin: 1.5em 0; padding: 18px 22px; background: var(--sun-50); border-left: 4px solid var(--sun); border-radius: 0 12px 12px 0; color: var(--ink); font-weight: 500; }
.entry blockquote p:last-child { margin: 0; }
.entry table { width: 100%; border-collapse: collapse; margin: 1.5em 0; font-size: 15px; display: block; overflow-x: auto; }
.entry th, .entry td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
.entry th { background: var(--soft); color: var(--ink); }
.entry iframe { max-width: 100%; border: 0; }
.entry::after { content: ""; display: table; clear: both; }
.entry [style*="color: #0000ff"], .entry [style*="color:#0000ff"] { color: var(--teal-d) !important; }
.entry [style*="font-family"] { font-family: inherit !important; }

.post-cta { margin-top: 40px; padding: 24px; border-radius: var(--radius); background: var(--teal-50); display: flex; gap: 16px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.post-cta strong { color: var(--ink); font-size: 18px; display: block; }
.post-cta p { margin: 0; color: var(--muted); }
.tags { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 8px; }
.related { border-top: 1px solid var(--line); padding-top: 48px; margin-top: 8px; }
.related h2 { font-size: 24px; margin-bottom: 20px; }

.pagination { margin-top: 40px; }
.pagination .nav-links { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.pagination .page-numbers { min-width: 42px; height: 42px; padding: 0 12px; display: inline-grid; place-items: center; border-radius: 10px; border: 1px solid var(--line); color: var(--ink); font-weight: 600; }
.pagination .current { background: var(--teal-d); border-color: var(--teal-d); color: #fff; }
.pagination a.page-numbers:hover { border-color: var(--teal); color: var(--teal-d); }
.cat-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.cat-tabs a { padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line); background: #fff; color: var(--ink); font-size: 14px; font-weight: 600; }
.cat-tabs a.on, .cat-tabs a:hover { background: var(--teal-d); border-color: var(--teal-d); color: #fff; }
.empty { text-align: center; padding: 64px 0; }
.empty .big { font-size: 96px; font-weight: 800; color: var(--teal-100); line-height: 1; }
.empty .search-form { max-width: 520px; margin: 24px auto; }


/* Trang chủ: cam kết, hỏi đáp, thông tin trung tâm */
.why { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.why article { padding: 22px; border-radius: var(--radius); border: 1px solid var(--line); background: #fff; position: relative; }
.why article::before { content: ""; display: block; width: 36px; height: 4px; border-radius: 4px; background: var(--teal); margin-bottom: 14px; }
.why article:nth-child(2)::before { background: var(--sun); }
.why article:nth-child(4)::before { background: var(--ink); }
.why h3 { font-size: 17px; margin-bottom: 6px; }
.why p { margin: 0; font-size: 15px; color: var(--muted); }
.faq-wrap { display: grid; grid-template-columns: 1fr 1.6fr; gap: 48px; align-items: start; }
.faq-wrap .sec-head { position: sticky; top: 100px; }
.faq { display: grid; gap: 10px; }
.faq details { background: #fff; border: 1px solid var(--line); border-radius: 12px; }
.faq details[open] { border-color: var(--teal-100); box-shadow: var(--shadow); }
.faq summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px 18px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary h3 { font-size: 16.5px; margin: 0; font-weight: 600; }
.faq summary .ic { color: var(--teal-d); transition: transform .15s; }
.faq details[open] summary .ic { transform: rotate(180deg); }
.faq details p { margin: 0; padding: 0 18px 18px; color: var(--ink-2); }
.about { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items: start; }
.about h2 { font-size: clamp(24px, 2.8vw, 32px); font-weight: 800; }
.about-btns { margin-top: 20px; }
.facts { margin: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.facts div { display: grid; grid-template-columns: 150px 1fr; gap: 12px; padding: 12px 18px; border-top: 1px solid var(--line); }
.facts div:first-child { border-top: 0; }
.facts div:nth-child(odd) { background: var(--soft); }
.facts dt { font-weight: 600; color: var(--muted); font-size: 14.5px; }
.facts dd { margin: 0; color: var(--ink); font-weight: 500; }

/* Màn hình vừa */
@media (max-width: 1400px) {
	.hotline span { display: none; }
	.hotline { padding: 0; background: none; }
	.menu > li > a { padding-left: 8px; padding-right: 8px; font-size: 14.5px; }
}

/* Điện thoại + máy tính bảng: menu trượt */
@media (max-width: 960px) {
	.topbar { display: none; }
	.site-header { backdrop-filter: none; background: #fff; }
	.header-in { min-height: 64px; }
	.nav-toggle { display: inline-grid; }
	.nav { position: fixed; top: 0; right: 0; bottom: 0; width: min(88vw, 380px); background: #fff; z-index: 60; transform: translateX(100%); transition: transform .2s; overflow-y: auto; padding: 72px 16px 24px; box-shadow: var(--shadow); }
	.nav.open { transform: none; }
	.nav-backdrop { position: fixed; inset: 0; background: rgba(28, 43, 58, .45); z-index: 55; }
	.menu { display: block; }
	.menu > li { display: flex; flex-wrap: wrap; border-bottom: 1px solid var(--line); }
	.menu > li > a { flex: 1; padding: 14px 4px; font-size: 16px; }
	.menu .sub-menu, .menu > li:nth-child(3) > .sub-menu, .menu > li:nth-child(4) > .sub-menu { position: static; display: none; width: 100%; min-width: 0; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: 0; padding: 0 0 10px 8px; }
	.menu li.open > .sub-menu { display: block; }
	.sub-toggle { display: inline-grid; place-items: center; width: 44px; height: 44px; border: 0; background: none; color: var(--ink); cursor: pointer; }
	.sub-toggle .ic { transition: transform .15s; }
	li.open > .sub-toggle .ic { transform: rotate(180deg); }
	.menu .sub-menu li { display: flex; flex-wrap: wrap; }
	.menu .sub-menu li > a { flex: 1; }
	.menu .sub-menu .sub-menu { display: none; }
	.nav-cta { display: grid; gap: 10px; margin-top: 20px; }
	.icon-btn.nav-close { display: inline-grid; position: absolute; top: 12px; right: 16px; }
	.hero-in, .layout, .tutor-cta, .cta-in, .faq-wrap, .about { grid-template-columns: minmax(0, 1fr); }
	.entry .alignleft, .entry .alignright { float: none; display: block; margin: 1.2em auto; }
	.faq-wrap { gap: 8px; }
	.faq-wrap .sec-head { position: static; }
	.why { grid-template-columns: 1fr 1fr; }
	.hero-in { gap: 32px; }
	.aside { position: static; }
	.levels, .tutors, .cards { grid-template-columns: 1fr 1fr; }
	.steps { grid-template-columns: 1fr 1fr; }
	.footer-grid { grid-template-columns: 1fr 1fr; }
	.cta-btns { justify-content: flex-start; }
	body.nav-lock { overflow: hidden; }
	body.nav-lock .site-header { z-index: 70; }
}

@media (max-width: 640px) {
	body { padding-bottom: 64px; }
	.brand-text strong { font-size: 20px; }
	.brand img { width: 40px; height: 40px; }
	.hero { padding-top: 32px; }
	.lead { font-size: 16.5px; }
	.hero-btns .btn { flex: 1; }
	.stats { grid-template-columns: 1fr 1fr; margin-top: 32px; }
	.stats div:nth-child(3) { border-left: 0; }
	.stats div:nth-child(n+3) { border-top: 1px solid var(--line); }
	.stats strong { font-size: 21px; }
	.section { padding: 52px 0; }
	.levels, .tutors, .cards, .steps, .footer-grid, .why { grid-template-columns: 1fr; }
	.facts div { grid-template-columns: 1fr; gap: 2px; }
	.subjects { grid-template-columns: 1fr 1fr; }
	.subject { padding: 14px; font-size: 14.5px; }
	.form-card { padding: 20px; }
	.tutor-cta { padding: 24px; }
	.entry { font-size: 16.5px; }
	.entry h2 { font-size: 22px; }
	.entry .alignleft, .entry .alignright { float: none; margin: 1em auto; }
	.cat-tabs { flex-wrap: nowrap; overflow-x: auto; margin-left: -16px; margin-right: -16px; padding: 0 16px 6px; scrollbar-width: none; }
	.cat-tabs::-webkit-scrollbar { display: none; }
	.cat-tabs a { flex: none; }
	.mobile-bar { display: grid; grid-template-columns: 1fr 1fr 1.2fr; position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; background: #fff; border-top: 1px solid var(--line); box-shadow: 0 -4px 16px rgba(28, 43, 58, .08); padding-bottom: env(safe-area-inset-bottom); }
	.mobile-bar a { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; height: 60px; font-size: 12.5px; font-weight: 600; color: var(--ink); }
	.mobile-bar .ic { width: 20px; height: 20px; color: var(--teal-d); }
	.mobile-bar .mb-primary { background: var(--sun); }
	.mobile-bar .mb-primary .ic { color: var(--ink); }
}

@media (prefers-reduced-motion: reduce) {
	* { transition: none !important; scroll-behavior: auto !important; }
}

/* SILO: trang trụ cột + khối cùng chủ đề */
.pillar-dv { margin-bottom: 44px; }
.pillar-dv h2, .pillar-h2 { font-size: 22px; margin-bottom: 16px; }
.dv-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px; }
.dv-list a { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: #fff; color: var(--ink); font-weight: 600; font-size: 15px; }
.dv-list a .ic { color: var(--teal); flex: none; }
.dv-list a:hover { border-color: var(--teal); color: var(--teal-d); }
.silo-box { margin-top: 32px; padding: 20px; border: 1px solid var(--teal-100); border-radius: var(--radius); background: #fff; display: grid; gap: 12px; }
.silo-box-head { margin: 0; font-weight: 600; color: var(--muted); }
.silo-box-head a { color: var(--teal-d); }
.entry + .silo-box .more, .silo-box .more { font-size: 14.5px; }
.aside-box h3 a { color: var(--ink); }
.silos { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.silo-card { display: flex; flex-direction: column; gap: 6px; padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; color: var(--ink-2); transition: border-color .15s, box-shadow .15s; }
.silo-card:hover { border-color: var(--teal); box-shadow: var(--shadow); color: var(--ink-2); }
.silo-card h3 { font-size: 18px; margin: 0; }
.silo-card p { margin: 0; font-size: 14.5px; color: var(--muted); }
.silo-card .meta { margin-top: 8px; color: var(--teal-d); font-weight: 600; }
@media (max-width: 960px) { .silos { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .silos { grid-template-columns: 1fr; } }
.pillar-body { max-width: 820px; margin: 56px auto 0; padding-top: 40px; border-top: 1px solid var(--line); }
.pillar-faq { max-width: 820px; margin: 40px auto 0; }
.pillar-faq h2 { font-size: 24px; margin-bottom: 16px; }