/* ============================================================
   Bogo landing v2 — Minimal sáng (Notion/Linear-like)
   Nền trắng, typography lớn, hairline borders, MỘT accent duy nhất.
   Không dùng Bootstrap — standalone, không đụng CSS v1.
   ============================================================ */

:root {
    --bg: #ffffff;
    --ink: #111318;
    --muted: #61646c;
    --line: #e7e8ea;
    --surface: #f7f7f5;
    --accent: #1E4FA6;
    --accent-ink: #ffffff;
    --radius: 14px;
    --container: 1120px;
    --font: 'Plus Jakarta Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--ink);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 760px; margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; font-weight: 700; }

/* ---------- Nav ---------- */
.nav {
    position: sticky; top: 0; z-index: 50;
    background: color-mix(in srgb, var(--bg) 85%, transparent);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
}
.nav-inner {
    max-width: var(--container); margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; gap: 28px; height: 64px;
}
.brand { display: flex; align-items: center; }
.nav-links { display: flex; align-items: center; gap: 24px; margin-left: auto; }
.nav-links a {
    color: var(--muted); text-decoration: none; font-size: 14.5px; font-weight: 600;
    transition: color .15s;
}
.nav-links a:hover { color: var(--ink); }
.lang-switch { color: var(--accent) !important; }
.nav .btn { margin-left: 4px; }
.nav-burger { display: none; background: none; border: 0; font-size: 26px; cursor: pointer; color: var(--ink); margin-left: auto; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 20px; border-radius: 10px; border: 1px solid transparent;
    font-family: inherit; font-size: 15px; font-weight: 600; text-decoration: none;
    cursor: pointer; transition: background .15s, border-color .15s, color .15s, transform .15s;
}
.btn-lg { padding: 13px 26px; font-size: 16px; border-radius: 12px; }
.btn-block { width: 100%; }
.btn-dark { background: var(--accent); color: #fff; }
.btn-dark:hover { background: #12315E; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-light { background: #fff; color: var(--ink); }
.btn-light:hover { background: #ececf4; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* ---------- Hero ---------- */
.hero { padding: 96px 24px 0; text-align: center; }
.eyebrow {
    display: inline-block; font-size: 13.5px; font-weight: 700; letter-spacing: .08em;
    text-transform: uppercase; color: var(--accent); margin-bottom: 20px;
}
.hero h1 {
    font-size: clamp(2.6rem, 6.5vw, 4.6rem); font-weight: 800; letter-spacing: -0.035em;
    max-width: 18ch; margin: 0 auto;
}
.hero .accent { color: var(--accent); }
.lede {
    max-width: 56ch; margin: 22px auto 0; font-size: clamp(1.05rem, 2vw, 1.25rem);
    color: var(--muted);
}
.hero-actions { display: flex; justify-content: center; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.hero-frame {
    margin: 64px auto 0; max-width: 980px;
    border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
}
.hero-frame img { display: block; width: 100%; height: auto; }

/* ---------- Stats ---------- */
.stats {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
    padding-top: 96px; padding-bottom: 96px;
}
.stat-num { font-size: clamp(1.8rem, 3.4vw, 2.6rem); font-weight: 800; letter-spacing: -0.02em; display: block; }
.stat-label { color: var(--muted); font-size: 14px; }

/* ---------- Sections ---------- */
.section { padding-top: 96px; padding-bottom: 96px; }
.h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); letter-spacing: -0.03em; margin-bottom: 48px; }

/* ---------- Cards / grid ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.card { background: var(--bg); padding: 28px; }
.card-icon { font-size: 22px; color: var(--accent); }
.card h3 { font-size: 17px; margin: 14px 0 8px; }
.card p { color: var(--muted); font-size: 14.5px; }

/* ---------- Steps ---------- */
.steps { list-style: none; display: grid; gap: 0; border-top: 1px solid var(--line); }
.step { display: flex; gap: 28px; padding: 32px 0; border-bottom: 1px solid var(--line); }
.step-num { font-size: 15px; font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; padding-top: 4px; }
.step h3 { font-size: 17px; margin-bottom: 6px; }
.step p { color: var(--muted); font-size: 14.5px; max-width: 64ch; }

/* ---------- Pricing ---------- */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: start; }
.plan { position: relative; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.plan-featured { background: var(--bg); color: var(--ink); border: 2px solid var(--accent); }
.plan-featured .plan-tagline, .plan-featured .plan-desc, .plan-featured .plan-note { color: var(--muted); }
.plan-featured .plan-features { color: var(--ink); }
.plan-featured .plan-features .bi { color: var(--accent); }
.plan-featured .btn-light { background: var(--accent); color: #fff; }
.plan-featured .btn-light:hover { background: #12315E; }
.plan-badge {
    position: absolute; top: -12px; left: 24px;
    background: var(--accent); color: var(--accent-ink);
    font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 999px;
}
.plan h3 { font-size: 18px; }
.plan-tagline { font-size: 13.5px; color: var(--muted); margin-top: 2px; }
.plan-desc { font-size: 14px; color: var(--muted); margin-top: 12px; min-height: 66px; }
.plan-price { font-size: 2.1rem; font-weight: 800; letter-spacing: -0.02em; margin-top: 18px; }
.plan-price small { font-size: .95rem; font-weight: 600; color: inherit; opacity: .65; }
.plan-note { font-size: 12.5px; color: var(--muted); margin: 2px 0 20px; }
.plan-features { list-style: none; margin-top: 22px; display: grid; gap: 10px; font-size: 14px; }
.plan-features .bi { color: var(--accent); margin-right: 9px; }

/* ---------- Testimonials ---------- */
.quotes {
    display: grid; grid-auto-flow: column; grid-auto-columns: min(420px, 84vw);
    gap: 20px; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 8px;
    scrollbar-width: thin;
}
.quote { scroll-snap-align: start; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; background: var(--surface); }
.quote blockquote { font-size: 15px; }
.quote figcaption { margin-top: 18px; display: grid; }
.quote figcaption span { color: var(--muted); font-size: 13px; }

/* ---------- FAQ ---------- */
.faq { border-bottom: 1px solid var(--line); }
.faq summary {
    list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center;
    padding: 20px 0; font-weight: 600; font-size: 15.5px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .bi { color: var(--muted); transition: transform .2s; }
.faq[open] summary .bi { transform: rotate(45deg); color: var(--accent); }
.faq p { padding-bottom: 20px; color: var(--muted); font-size: 14.5px; max-width: 66ch; }

/* ---------- CTA band ---------- */
.cta-band {
    background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
    text-align: center; padding: 72px 24px;
}
.cta-band h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: -0.03em; }
.cta-band p { color: var(--muted); max-width: 58ch; margin: 14px auto 28px; }

/* ---------- Contact form ---------- */
.lead-form { display: grid; gap: 18px; margin-top: 8px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: grid; gap: 6px; }
.field label { font-size: 13.5px; font-weight: 600; color: var(--muted); }
.field input, .field select, .field textarea {
    font-family: inherit; font-size: 15px; color: var(--ink);
    border: 1px solid var(--line); border-radius: 10px; padding: 11px 14px;
    background: var(--bg); transition: border-color .15s, box-shadow .15s;
}
.field input:focus, .field select:focus, .field textarea:focus {
    outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
.field textarea { resize: vertical; }
.plan-pick { border: 0; display: flex; gap: 10px; flex-wrap: wrap; }
.plan-pick legend { font-size: 13.5px; font-weight: 600; color: var(--muted); margin-bottom: 8px; }
.plan-pick label { cursor: pointer; }
.plan-pick input { position: absolute; opacity: 0; pointer-events: none; }
.plan-pick span {
    display: inline-block; padding: 8px 18px; border: 1px solid var(--line); border-radius: 999px;
    font-size: 14px; font-weight: 600; transition: all .15s;
}
.plan-pick input:checked + span { background: var(--accent); color: #fff; border-color: var(--accent); }
.plan-pick input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-msg { border-radius: 10px; padding: 12px 16px; font-size: 14.5px; }
.form-ok { background: #ecfaf1; color: #147a43; border: 1px solid #b8e8cd; }
.form-err { background: #fdf0ef; color: #b3372e; border: 1px solid #f3cdc9; }
.contact-meta { list-style: none; display: flex; gap: 28px; flex-wrap: wrap; margin-top: 36px; color: var(--muted); font-size: 14px; }
.contact-meta .bi { color: var(--accent); margin-right: 7px; }
.contact-meta a { color: inherit; text-decoration: none; }
.contact-meta a:hover { color: var(--ink); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); margin-top: 96px; padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-grid p { color: var(--muted); font-size: 14px; margin-top: 16px; max-width: 34ch; }
.footer-grid h4 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 14px; }
.footer-grid nav { display: grid; gap: 9px; align-content: start; }
.footer-grid nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
.footer-grid nav a:hover { color: var(--ink); }
.footer-grid h4 + h4 { margin-top: 26px; }
.copyright { color: var(--muted); font-size: 13px; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line); }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
    html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
    .grid-3 { grid-template-columns: 1fr 1fr; }
    .plans { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
    .stats { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
    .nav-links, .nav > .nav-inner > .btn { display: none; }
    .nav-burger { display: block; }
    body.nav-open .nav-links {
        display: grid; position: absolute; top: 64px; left: 0; right: 0;
        background: var(--bg); border-bottom: 1px solid var(--line);
        padding: 20px 24px; gap: 16px;
    }
    .grid-3 { grid-template-columns: 1fr; }
    .stats { grid-template-columns: 1fr 1fr; gap: 28px; }
    .form-row { grid-template-columns: 1fr; }
    .section { padding-top: 64px; padding-bottom: 64px; }
    .hero { padding-top: 64px; }
}