/* Giao diện "Apple 2026" — phong cách tham khảo tipme.vn: tím #7F56D9 + hồng #F16184, font Inter / Plus Jakarta Sans,
   header cao 56 / 64 / 80px, nút bo 8px cao 40 / 48px, thẻ bo 16px, icon nét Lucide (stroke 2). Biến lấy từ CSS tipme.vn. */
:root {
  --primary-50: #F4EBFF; --primary-100: #E9D7FE; --primary-200: #D6BBFB; --primary-300: #B692F6; --primary-500: #9E77ED; --primary-600: #7F56D9; --primary-700: #5430B6; --primary-800: #42307D; --primary-900: #2A1A52;
  --pink: #F16184; --cyan: #0FD9FF;
  --gray-50: #F9FAFB; --gray-100: #F2F4F7; --gray-200: #EAECF0; --gray-300: #D0D5DD; --gray-400: #98A2B3; --gray-500: #667085; --gray-600: #475467; --gray-700: #344054; --gray-800: #1D2939; --gray-900: #101828;
  --success-50: #ECFDF3; --success-500: #12B76A; --success-700: #027A48; --error-50: #FEF3F2; --error-700: #B42318;
  --gradient-brand: linear-gradient(90deg, #5430B6 0%, #7F56D9 50%, #F16184 100%);
  --gradient-hero: linear-gradient(135deg, #F4EBFF 0%, #FFE4F1 60%, #E0F2FE 100%);
  --gradient-cta: linear-gradient(135deg, #5430B6, #7F56D9 60%, #F16184);
  --shadow-sm: 0 1px 3px #1018281A, 0 1px 2px #1018280F; --shadow-md: 0 4px 8px #10182814, 0 2px 4px #1018280A; --shadow-lg: 0 12px 16px #10182814, 0 4px 6px #10182808;
  --shadow-cta: 0 4px 12px #5430B659; --shadow-focus: 0 0 0 4px #7F56D933;
  --r-sm: 6px; --r-md: 8px; --r-lg: 12px; --r-xl: 16px; --r-2xl: 20px; --r-3xl: 24px;
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Plus Jakarta Sans", "Inter", system-ui, sans-serif;
  --max: 1280px; --gutter: 16px; --header-h: 56px;
}
@media (min-width: 768px) { :root { --gutter: 20px; --header-h: 64px; } }
@media (min-width: 1024px) { :root { --gutter: 32px; --header-h: 80px; } }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }
body { margin: 0; font-family: var(--font-sans); font-size: 16px; line-height: 1.5; color: var(--gray-700); background: #fff; -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; display: block; }
a { color: var(--primary-600); text-decoration: none; }
a:hover { color: var(--primary-700); }
h1, h2, h3, h4 { margin: 0; font-family: var(--font-display); color: var(--gray-900); }
p { margin: 0 0 1em; }
.wrap { width: min(var(--max), 100% - var(--gutter) * 2); margin-inline: auto; }
.narrow { width: min(820px, 100% - var(--gutter) * 2); }
.ico { width: 20px; height: 20px; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.ico-lg { width: 24px; height: 24px; }
.muted { color: var(--gray-500); }
.center { text-align: center; }

/* ---------- Nút (kiểu Ant Design của tipme: cao 40, lớn 48, bo 8, chữ 600) ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 40px; padding: 0 16px; border-radius: var(--r-md); border: 1px solid transparent; font: 600 14px/1 var(--font-sans); cursor: pointer; transition: background-color .15s, border-color .15s, box-shadow .25s, color .15s; text-decoration: none; white-space: nowrap; }
.btn-lg { height: 48px; padding: 0 24px; font-size: 15px; }
.btn-primary { background: var(--primary-600); color: #fff; }
.btn-primary:hover { background: var(--primary-700); color: #fff; }
.btn-outline { background: #fff; border-color: var(--gray-300); color: var(--gray-700); }
.btn-outline:hover { border-color: var(--primary-600); color: var(--primary-600); }
.btn-cta { background: var(--gradient-cta); color: #fff; box-shadow: var(--shadow-cta); }
.btn-cta:hover { color: #fff; box-shadow: 0 8px 20px #5430B666; }
.btn-white { background: #fff; color: var(--primary-700); border-radius: 11px; font-weight: 700; }
.btn-white:hover { background: var(--primary-50); color: var(--primary-700); }
.btn:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: none; box-shadow: var(--shadow-focus); }

/* ---------- Header ---------- */
.hd { position: sticky; top: 0; z-index: 50; background: #fff; box-shadow: var(--shadow-sm); }
.hd-in { display: flex; align-items: center; gap: 24px; height: var(--header-h); }
.brand { display: inline-flex; align-items: center; gap: 10px; font: 700 20px/1 var(--font-display); color: var(--gray-900); letter-spacing: -.3px; }
.brand:hover { color: var(--gray-900); }
.brand-mark { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--gradient-cta); color: #fff; }
.brand img { height: 36px; width: auto; }
.nav { display: none; align-items: center; gap: 2px; margin-left: auto; }
.nav a, .nav-item > a { white-space: nowrap; display: inline-flex; align-items: center; gap: 4px; padding: 8px 14px; border-radius: var(--r-md); font-size: 15px; font-weight: 600; color: var(--gray-700); }
.nav a:hover, .nav a.is-active { background: var(--primary-50); color: var(--primary-700); }
.nav-item { position: relative; }
.nav-sub { position: absolute; top: 100%; left: 0; min-width: 240px; padding: 8px; background: #fff; border: 1px solid var(--gray-200); border-radius: var(--r-lg); box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden; transform: translateY(6px); transition: opacity .15s, transform .15s, visibility .15s; }
.nav-item:hover .nav-sub, .nav-item:focus-within .nav-sub { opacity: 1; visibility: visible; transform: none; }
.nav-sub a { display: flex; width: 100%; padding: 10px 12px; font-weight: 500; }
.hd-cta { display: none; }
.menu-btn { margin-left: auto; display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid var(--gray-200); border-radius: var(--r-md); background: #fff; color: var(--gray-700); cursor: pointer; }
@media (min-width: 1024px) {
  .nav { display: flex; } .hd-cta { display: inline-flex; margin-left: 8px; } .menu-btn { display: none; }
}
@media (max-width: 1023px) {
  .nav { position: absolute; top: var(--header-h); left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; padding: 8px var(--gutter) 16px; background: #fff; border-top: 1px solid var(--gray-200); box-shadow: var(--shadow-lg); max-height: calc(100vh - var(--header-h)); overflow-y: auto; }
  .nav.open { display: flex; }
  .nav-item { display: block; }
  .nav-sub { position: static; opacity: 1; visibility: visible; transform: none; border: 0; box-shadow: none; padding: 0 0 4px 16px; min-width: 0; }
  .nav a, .nav-item > a { padding: 12px 8px; }
}

/* ---------- Khối chung ---------- */
.section { padding: 48px 0; }
@media (min-width: 1024px) { .section { padding: 72px 0; } }
.section-alt { background: var(--gray-50); }
.sec-head { display: flex; align-items: end; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 28px; }
.sec-title { font-size: 24px; font-weight: 700; letter-spacing: -.5px; line-height: 1.25; }
.sec-sub { margin: 6px 0 0; color: var(--gray-500); }
.link-more { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: 15px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border-radius: 999px; background: var(--primary-50); color: var(--primary-700); font-size: 13px; font-weight: 600; }

.hero { background: var(--gradient-hero); padding: 40px 0 48px; }
@media (min-width: 1024px) { .hero { padding: 72px 0 80px; } }
.hero-grid { display: grid; gap: 32px; align-items: center; }
@media (min-width: 1024px) { .hero-grid { grid-template-columns: 1.1fr .9fr; } }
.h1 { margin-top: 16px; font-size: 28px; line-height: 36px; font-weight: 800; letter-spacing: -.5px; }
@media (min-width: 768px) { .h1 { font-size: 36px; line-height: 44px; letter-spacing: -1px; } }
@media (min-width: 1024px) { .h1 { font-size: 48px; line-height: 60px; letter-spacing: -1.5px; } }
.hero p.lead { margin: 16px 0 0; max-width: 560px; font-size: 18px; color: var(--gray-600); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.stats { display: flex; gap: 28px; flex-wrap: wrap; margin-top: 32px; }
.stat b { display: block; font: 800 28px/1.1 var(--font-display); color: var(--primary-700); letter-spacing: -.5px; }
.stat span { font-size: 14px; color: var(--gray-500); }
.hero-art { position: relative; border-radius: var(--r-3xl); overflow: hidden; box-shadow: var(--shadow-lg); }
.page-head { background: var(--gradient-hero); padding: 36px 0 40px; }
@media (min-width: 1024px) { .page-head { padding: 56px 0 60px; } }
.crumb { display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--gray-500); margin-bottom: 14px; flex-wrap: wrap; }
.crumb a { color: var(--gray-500); } .crumb a:hover { color: var(--primary-700); }

/* ---------- Thẻ ---------- */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }
.card { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--r-xl); box-shadow: var(--shadow-sm); overflow: hidden; transition: box-shadow .25s, transform .25s, border-color .25s; }
a.card:hover, .card:hover { box-shadow: var(--shadow-md); border-color: var(--primary-200); }
.card-body { padding: 20px; }
.card h3 { font-size: 18px; font-weight: 700; letter-spacing: -.2px; line-height: 1.3; }
.card p { margin: 8px 0 0; font-size: 14px; color: var(--gray-500); }
.card time { font-size: 13px; color: var(--gray-500); }
.card-img { aspect-ratio: 16 / 10; background: var(--gradient-brand); }
.card-img img { width: 100%; height: 100%; object-fit: cover; }
.cat-card { display: flex; flex-direction: column; gap: 12px; padding: 24px; }
.cat-ico { display: grid; place-items: center; width: 48px; height: 48px; border-radius: var(--r-lg); background: var(--primary-50); color: var(--primary-600); }
.cat-card h3 { font-size: 20px; }
.cat-card .go { margin-top: auto; display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: 14px; }

/* Minh hoạ thiết bị: nền gradient + hình SVG */
.art { display: grid; place-items: center; aspect-ratio: 8 / 5; }
.art svg { width: 78%; height: auto; max-height: 86%; filter: drop-shadow(0 10px 18px rgba(16, 24, 40, .25)); }
.g1 { background: linear-gradient(135deg, #5430B6, #7F56D9 55%, #F16184); }
.g2 { background: linear-gradient(135deg, #42307D, #7F56D9 60%, #0FD9FF); }
.g3 { background: linear-gradient(135deg, #7F56D9, #B692F6 55%, #FFD1E6); }
.g4 { background: linear-gradient(135deg, #2A1A52, #5430B6 60%, #9E77ED); }
.g5 { background: linear-gradient(135deg, #F16184, #9E77ED 60%, #5430B6); }
.g6 { background: linear-gradient(135deg, #1D2939, #42307D 60%, #7F56D9); }

/* Sản phẩm */
.prod { display: grid; gap: 0; }
@media (min-width: 900px) { .prod { grid-template-columns: 5fr 7fr; } .prod.flip .art-col { order: 2; } }
.prod .art { aspect-ratio: auto; min-height: 260px; height: 100%; }
.prod-body { padding: 24px; display: flex; flex-direction: column; gap: 12px; }
@media (min-width: 1024px) { .prod-body { padding: 32px; } }
.badge { align-self: flex-start; display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px; background: var(--success-50); color: var(--success-700); font-size: 12px; font-weight: 600; }
.prod h2 { font-size: 24px; font-weight: 800; letter-spacing: -.5px; }
.price { font: 700 18px/1.3 var(--font-display); color: var(--primary-700); }
.specs { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.specs li { display: flex; gap: 10px; font-size: 15px; }
.specs .ico { width: 18px; height: 18px; margin-top: 3px; color: var(--success-500); }
.prod-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }
.stack { display: grid; gap: 24px; }
.note { margin-top: 28px; padding: 14px 16px; border-radius: var(--r-lg); background: var(--primary-50); color: var(--primary-800); font-size: 14px; }

/* Dòng thời gian */
.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; border-left: 2px solid var(--primary-100); margin-left: 8px; }
.timeline li { position: relative; display: grid; grid-template-columns: 76px 1fr; gap: 12px; padding: 0 0 22px 24px; }
.timeline li::before { content: ""; position: absolute; left: -7px; top: 5px; width: 12px; height: 12px; border-radius: 50%; background: var(--primary-600); box-shadow: 0 0 0 4px var(--primary-100); }
.timeline b { font: 700 15px/1.5 var(--font-display); color: var(--primary-700); }
.timeline span { color: var(--gray-700); }

/* Bảng giá */
.plans { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.plan { position: relative; display: flex; flex-direction: column; padding: 28px; background: #fff; border: 1px solid var(--gray-200); border-radius: var(--r-2xl); box-shadow: var(--shadow-sm); }
.plan.is-hot { border: 2px solid var(--primary-600); box-shadow: var(--shadow-lg); }
.plan-tag { position: absolute; top: -13px; left: 24px; padding: 4px 12px; border-radius: 999px; background: var(--primary-600); color: #fff; font-size: 12px; font-weight: 700; }
.plan h3 { font-size: 20px; font-weight: 700; }
.plan-desc { margin: 4px 0 0; font-size: 14px; color: var(--gray-500); }
.plan-price { margin: 14px 0; font: 800 28px/1.15 var(--font-display); color: var(--gray-900); letter-spacing: -.5px; }
.plan-price small { font: 500 14px var(--font-sans); color: var(--gray-500); }
.plan-features { list-style: none; margin: 0 0 24px; padding: 0; display: grid; gap: 10px; flex: 1; font-size: 15px; }
.plan-features li { display: flex; gap: 10px; }
.plan-features li::before { content: ""; flex-shrink: 0; width: 18px; height: 18px; margin-top: 3px; background: no-repeat center / contain url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2312B76A' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E"); }

/* Nội dung bài viết / trang */
.rich { font-size: 17px; line-height: 1.8; }
.rich h2, .rich h3 { margin: 1.5em 0 .5em; letter-spacing: -.3px; }
.rich img { max-width: 100%; height: auto; border-radius: var(--r-xl); margin: 1em 0; }
.rich blockquote { margin: 1.2em 0; padding: .7em 1.2em; border-left: 4px solid var(--primary-600); background: var(--primary-50); border-radius: 0 var(--r-lg) var(--r-lg) 0; }
.rich ul, .rich ol { padding-left: 1.4em; }
.title-xl { font-size: 28px; line-height: 36px; font-weight: 800; letter-spacing: -.5px; }
@media (min-width: 1024px) { .title-xl { font-size: 40px; line-height: 48px; letter-spacing: -1px; } }
.cover { width: 100%; border-radius: var(--r-2xl); margin: 20px 0 28px; }
.pager { display: flex; justify-content: center; gap: 6px; flex-wrap: wrap; margin-top: 36px; }
.pager a { min-width: 40px; height: 40px; padding: 0 14px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--gray-300); border-radius: var(--r-md); font-weight: 600; color: var(--gray-700); }
.pager a:hover { border-color: var(--primary-600); color: var(--primary-600); }
.pager a.is-current { background: var(--primary-600); border-color: var(--primary-600); color: #fff; }
.empty { text-align: center; padding: 40px 0; color: var(--gray-500); }

/* Liên hệ */
.contact-grid { display: grid; gap: 32px; }
@media (min-width: 900px) { .contact-grid { grid-template-columns: 1fr 1.25fr; gap: 48px; align-items: start; } }
.info-list { list-style: none; margin: 20px 0 0; padding: 0; display: grid; gap: 14px; }
.info-list li { display: flex; gap: 12px; align-items: flex-start; }
.info-list .ico { margin-top: 2px; color: var(--primary-600); }
.formbox { padding: 24px; background: #fff; border: 1px solid var(--gray-200); border-radius: var(--r-2xl); box-shadow: var(--shadow-md); }
@media (min-width: 768px) { .formbox { padding: 32px; } }
.form { display: grid; gap: 18px; }
.form label { display: grid; gap: 6px; font-size: 14px; font-weight: 600; color: var(--gray-700); }
.form input, .form select, .form textarea { height: 44px; padding: 0 14px; border: 1px solid var(--gray-300); border-radius: var(--r-md); font: 400 16px var(--font-sans); color: var(--gray-900); background: #fff; }
.form textarea { height: auto; padding: 12px 14px; }
.form input:focus, .form select:focus, .form textarea:focus { border-color: var(--primary-600); }
.form-row { display: grid; gap: 16px; }
@media (min-width: 640px) { .form-row { grid-template-columns: 1fr 1fr; } }
.req { color: var(--error-700); }
.notice { padding: 14px 16px; border-radius: var(--r-lg); margin-bottom: 16px; font-size: 15px; }
.notice ul { margin: 0; padding-left: 18px; }
.notice-ok { background: var(--success-50); color: var(--success-700); border: 1px solid #A6F4C5; }
.notice-error { background: var(--error-50); color: var(--error-700); border: 1px solid #FECDCA; }

/* CTA + footer */
.cta { background: var(--gradient-cta); color: #fff; border-radius: var(--r-3xl); padding: 32px 24px; display: grid; gap: 20px; align-items: center; }
@media (min-width: 900px) { .cta { grid-template-columns: 1fr auto; padding: 44px 48px; } }
.cta h2 { color: #fff; font-size: 26px; font-weight: 800; letter-spacing: -.5px; }
.cta p { margin: 8px 0 0; color: #F4EBFF; }
.ft { background: var(--gray-900); color: var(--gray-300); margin-top: 0; }
.ft-in { display: grid; gap: 28px; padding: 48px 0 32px; }
@media (min-width: 768px) { .ft-in { grid-template-columns: 1.5fr 1fr 1fr 1fr; } }
.ft h4 { color: #fff; font-size: 15px; margin-bottom: 12px; }
.ft a { color: var(--gray-300); } .ft a:hover { color: #fff; }
.ft ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; font-size: 14px; }
.ft-brand { font: 700 20px var(--font-display); color: #fff; margin: 0 0 10px; }
.ft p { font-size: 14px; margin: 0 0 8px; }
.ft-bottom { border-top: 1px solid #344054; padding: 18px 0; font-size: 13px; color: var(--gray-400); }
.big-404 { font: 800 96px/1 var(--font-display); background: var(--gradient-brand); -webkit-background-clip: text; background-clip: text; color: transparent; margin: 0 0 8px; }