/* ===== OperoSense brand ===== */
:root {
    --navy: #0d1b2a;
    --navy-2: #0a1622;
    --blue: #2f83c2;
    --blue-deep: #1f6fb2;
    --lime: #a8ce3a;
    --lime-deep: #8fb52b;
    --light: #f6f8fb;
    --gray: #e2e8f0;
    --text-main: #334155;
    --text-muted: #64748b;
    --font-stack: 'Inter', system-ui, -apple-system, sans-serif;
}

/* ---- multi-language display logic ---- */
[data-lang="en"] .lang-vi, [data-lang="en"] .lang-no { display: none; }
[data-lang="vi"] .lang-en, [data-lang="vi"] .lang-no { display: none; }
[data-lang="no"] .lang-en, [data-lang="no"] .lang-vi { display: none; }
[data-lang="en"] .input-vi, [data-lang="en"] .input-no { display: none; }
[data-lang="vi"] .input-en, [data-lang="vi"] .input-no { display: none; }
[data-lang="no"] .input-en, [data-lang="no"] .input-vi { display: none; }

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-stack); color: var(--text-main); line-height: 1.65; }
.container { max-width: 1140px; margin: 0 auto; padding: 0 22px; }
img { max-width: 100%; display: block; }

/* ---- header & nav ---- */
.top-bar { background: var(--navy); color: #dbe7f2; text-align: center; padding: 9px; font-size: 0.82rem; font-weight: 500; letter-spacing: .2px; }
header { background: #fff; position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 14px rgba(13,27,42,0.07); }
nav { display: flex; justify-content: space-between; align-items: center; padding: 14px 5%; max-width: 1300px; margin: 0 auto; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; }
.brand-mark { width: 38px; height: 38px; }
.brand-name { font-size: 1.5rem; font-weight: 800; color: var(--blue); letter-spacing: -.3px; }
.brand-accent { color: var(--lime-deep); }
.nav-links { list-style: none; display: flex; gap: 26px; align-items: center; }
.nav-links a { text-decoration: none; color: var(--navy); font-weight: 600; font-size: 0.95rem; transition: color .2s; }
.nav-links a:hover { color: var(--blue); }
.btn-nav { background: var(--blue); color: #fff !important; padding: 9px 18px; border-radius: 6px; }
.btn-nav:hover { background: var(--blue-deep); }
.lang-switch select { padding: 6px 8px; border-radius: 6px; border: 1px solid var(--gray); cursor: pointer; font-weight: 600; color: var(--navy); }

/* ---- hero ---- */
.hero {
    background:
        linear-gradient(rgba(9,20,33,0.86), rgba(9,20,33,0.92)),
        url('https://images.unsplash.com/photo-1558444479-c8f010528733?auto=format&fit=crop&q=80') center/cover;
    color: #fff; padding: 120px 20px 96px; text-align: center;
}
.hero-wrapper { max-width: 880px; margin: 0 auto; }
.eyebrow { display: inline-block; color: var(--lime); font-weight: 600; font-size: 0.9rem; letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 20px; border: 1px solid rgba(168,206,58,.35); padding: 6px 16px; border-radius: 40px; }
.hero h1 { font-size: 3.3rem; margin-bottom: 22px; line-height: 1.15; font-weight: 800; letter-spacing: -1px; }
.hero p { font-size: 1.2rem; color: #cbd5e1; margin-bottom: 38px; max-width: 720px; margin-inline: auto; }
.cta-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 44px; justify-content: center; flex-wrap: wrap; margin-top: 58px; border-top: 1px solid rgba(255,255,255,.12); padding-top: 34px; }
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 1.9rem; color: var(--lime); font-weight: 800; }
.hero-stats span { font-size: 0.82rem; color: #94a3b8; text-transform: uppercase; letter-spacing: .6px; }

/* ---- sections ---- */
.section-light { padding: 96px 0; background: #fff; }
.section-gray { padding: 96px 0; background: var(--light); }
.section-dark { padding: 96px 0; background: var(--navy); color: #fff; }
.section-title { font-size: 2.4rem; text-align: center; margin-bottom: 14px; color: var(--navy); font-weight: 800; letter-spacing: -.5px; }
.section-dark .section-title { color: #fff; }
.section-subtitle { text-align: center; color: var(--text-muted); margin-bottom: 54px; max-width: 720px; margin-inline: auto; }
.section-dark .section-subtitle { color: #9fb3c7; }

/* ---- product / platform ---- */
.product-layout { display: grid; grid-template-columns: 1.1fr 1fr; gap: 54px; align-items: center; }
.product-figure img { border-radius: 14px; border: 1px solid var(--gray); box-shadow: 0 18px 40px rgba(13,27,42,0.10); }
.figure-caption { display: block; margin-top: 14px; font-size: 0.85rem; color: var(--text-muted); font-style: italic; }
.feature-list { list-style: none; display: flex; flex-direction: column; gap: 22px; }
.feature-list li { padding-left: 20px; border-left: 3px solid var(--lime); }
.feature-list strong { display: block; color: var(--navy); font-size: 1.08rem; margin-bottom: 4px; }
.feature-list li.feature-highlight { border-left-color: var(--blue); background: linear-gradient(90deg, rgba(47,131,194,0.07), transparent); padding: 12px 16px; border-radius: 0 10px 10px 0; }
.feature-list li.feature-highlight strong { color: var(--blue-deep); }
.product-note { margin-top: 26px; padding: 16px 18px; background: var(--light); border-radius: 10px; font-size: 0.92rem; color: var(--text-muted); }

/* ---- coverage spec sheet ---- */
.coverage { margin-top: 56px; border: 1px solid var(--gray); border-radius: 16px; background: #fff; overflow: hidden; box-shadow: 0 8px 26px rgba(13,27,42,0.06); }
.coverage-title { display: block; background: var(--navy); color: #fff; font-weight: 700; font-size: 0.95rem; letter-spacing: .4px; padding: 15px 28px; }
.coverage-row { display: grid; grid-template-columns: 210px 1fr; gap: 22px; align-items: center; padding: 20px 28px; border-top: 1px solid var(--gray); }
.coverage-label { font-weight: 700; color: var(--navy); font-size: 1rem; display: flex; align-items: center; gap: 9px; }
.coverage-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.coverage-tags > span { background: var(--light); border: 1px solid var(--gray); color: var(--navy); font-weight: 600; font-size: 0.88rem; padding: 8px 15px; border-radius: 8px; transition: .2s; }
.coverage-tags > span:hover { border-color: var(--blue); box-shadow: 0 2px 8px rgba(47,131,194,0.12); }
@media (max-width: 640px) { .coverage-row { grid-template-columns: 1fr; gap: 12px; } }

/* ---- capability cards ---- */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 28px; }
.card { padding: 38px; border: 1px solid var(--gray); border-radius: 14px; background: #fff; transition: .3s ease; }
.card:hover { transform: translateY(-8px); border-color: var(--blue); box-shadow: 0 18px 38px rgba(13,27,42,0.09); }
.card-icon { font-size: 2.4rem; margin-bottom: 18px; display: block; }
.card h3 { color: var(--navy); margin-bottom: 10px; font-size: 1.2rem; }

/* ---- research papers ---- */
.paper { display: grid; grid-template-columns: 1fr 1.2fr; gap: 44px; align-items: center; background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.09); border-radius: 16px; padding: 30px; margin-bottom: 34px; }
.paper.reverse { grid-template-columns: 1.2fr 1fr; }
.paper.reverse .paper-figure { order: 2; }
.paper-figure img { border-radius: 12px; background: #fff; padding: 8px; }
.paper-journal { color: var(--lime); font-weight: 600; font-size: 0.82rem; letter-spacing: .5px; text-transform: uppercase; }
.paper-body h3 { color: #fff; font-size: 1.4rem; margin: 10px 0 14px; line-height: 1.3; }
.paper-body p { color: #c3d2e0; margin-bottom: 14px; }
.paper-authors { font-size: 0.85rem; color: #8399ad !important; font-style: italic; }
.btn-outline { border: 2px solid var(--lime); color: var(--lime); background: transparent; padding: 11px 22px; }
.btn-outline:hover { background: var(--lime); color: var(--navy); }

/* ---- coming soon card ---- */
.coming-soon { text-align: center; border: 2px dashed rgba(168,206,58,0.45); border-radius: 16px; padding: 34px 28px; background: rgba(255,255,255,0.03); }
.badge-review { display: inline-block; background: rgba(168,206,58,0.15); color: var(--lime); border: 1px solid rgba(168,206,58,0.5); font-size: 0.75rem; font-weight: 700; letter-spacing: .8px; text-transform: uppercase; padding: 5px 14px; border-radius: 40px; margin-bottom: 14px; }
.coming-soon h3 { color: #fff; font-size: 1.4rem; margin-bottom: 12px; }
.coming-soon p { color: #c3d2e0; max-width: 680px; margin: 0 auto; }

/* ---- form ---- */
.form-container { max-width: 820px; }
.inquiry-form { background: #fff; padding: 40px; border-radius: 14px; box-shadow: 0 12px 34px rgba(13,27,42,0.07); }
.form-row { display: flex; gap: 20px; margin-bottom: 20px; }
.input-group { flex: 1; }
input, select, textarea { width: 100%; padding: 14px; border: 1px solid #cbd5e1; border-radius: 8px; font-size: 1rem; font-family: inherit; transition: .25s; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(47,131,194,0.14); }
textarea { resize: vertical; }
.founders { margin-top: 36px; display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; }
.founder { background: #fff; border: 1px solid var(--gray); border-radius: 14px; padding: 26px 26px 22px; text-align: center; display: flex; flex-direction: column; align-items: center; gap: 5px; max-width: 340px; box-shadow: 0 8px 24px rgba(13,27,42,0.05); }
.founder-photo { width: 104px; height: 104px; border-radius: 50%; object-fit: cover; border: 3px solid var(--blue); margin-bottom: 8px; background: var(--gray); }
.founder-name { font-weight: 800; color: var(--navy); font-size: 1.15rem; }
.founder-role { color: var(--blue-deep); font-weight: 700; font-size: 0.9rem; margin-bottom: 8px; }
.founder-contact { display: flex; flex-direction: column; gap: 2px; margin-bottom: 12px; }
.founder-contact a { color: var(--navy); text-decoration: none; font-weight: 600; font-size: 0.92rem; }
.founder-contact a:hover { color: var(--blue-deep); text-decoration: underline; }
.founder-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.founder-links a { font-size: 0.8rem; font-weight: 600; color: var(--blue-deep); text-decoration: none; border: 1px solid var(--gray); padding: 5px 11px; border-radius: 40px; transition: .2s; }
.founder-links a:hover { background: var(--blue); color: #fff; border-color: var(--blue); }

/* ---- buttons ---- */
.btn { display: inline-block; padding: 15px 30px; border-radius: 8px; font-weight: 700; text-decoration: none; border: none; cursor: pointer; transition: .25s; font-size: 1rem; }
.btn-primary { background: var(--lime); color: var(--navy); }
.btn-primary:hover { background: var(--lime-deep); transform: translateY(-2px); }
.btn-secondary { border: 2px solid rgba(255,255,255,.7); color: #fff; }
.btn-secondary:hover { background: #fff; color: var(--navy); }
.btn-block { width: 100%; font-size: 1.08rem; }

/* ---- footer ---- */
footer { background: var(--navy-2); color: #7d92a6; padding: 52px 0; text-align: center; border-top: 1px solid #17293c; }
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 12px; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand .brand-mark { width: 32px; height: 32px; }
.footer-brand .brand-name { font-size: 1.3rem; }
.footer-tag { color: #b9c8d6; font-weight: 500; }
.footer-copy { font-size: 0.85rem; }

/* ---- responsive ---- */
@media (max-width: 860px) {
    .nav-links { gap: 16px; }
    .nav-links li:not(.lang-switch):not(:has(.btn-nav)) { display: none; }
    .hero h1 { font-size: 2.3rem; }
    .product-layout { grid-template-columns: 1fr; gap: 34px; }
    .paper, .paper.reverse { grid-template-columns: 1fr; gap: 24px; }
    .paper.reverse .paper-figure { order: 0; }
    .form-row { flex-direction: column; gap: 10px; }
    .hero-stats { gap: 28px; }
}

/* Contact form submit status */
.form-status {
    margin-top: 14px;
    font-size: 0.95rem;
    font-weight: 600;
    min-height: 1.2em;
    color: #0a7d3c;
}