/* ========================================================
   Tenlink LLC — Enterprise Cybersecurity Theme
   Inspired by Sumo Logic / BlueVoyant
   ======================================================== */

:root {
    --navy-deep: #080e1a;
    --navy: #0c1524;
    --navy-mid: #111d32;
    --navy-light: #162440;
    --navy-card: #0f1a2e;
    --navy-card-hover: #142038;
    --border: rgba(255,255,255,0.06);
    --border-hover: rgba(255,255,255,0.1);
    --text: #d8dce6;
    --text-secondary: #7e879a;
    --text-muted: #4d5568;
    --white: #f0f2f7;
    --blue: #2b7fff;
    --blue-bright: #4d9aff;
    --blue-glow: rgba(43,127,255,0.1);
    --blue-glow-strong: rgba(43,127,255,0.2);
    --cyan: #22d3ee;
    --green: #34d399;
    --amber: #fbbf24;
    --mono: 'DM Mono', 'Menlo', monospace;
    --sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-w: 1100px;
    --transition: 0.2s ease;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--sans); background: var(--navy-deep);
    color: var(--text); line-height: 1.7; -webkit-font-smoothing: antialiased;
}
a { color: var(--blue-bright); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--cyan); }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* ── NAV ── */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(8,14,26,0.9);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between; height: 56px;
}
.nav-logo {
    display: flex; align-items: center; gap: 9px;
    font-weight: 700; font-size: 16px; color: #fff; text-decoration: none;
}
.nav-logo:hover { color: #fff; }
.logo-mark {
    width: 28px; height: 28px; background: var(--blue);
    border-radius: 7px; display: flex; align-items: center; justify-content: center;
}
.logo-mark svg { width: 14px; height: 14px; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-link {
    font-size: 13px; font-weight: 500; color: var(--text-secondary);
    text-decoration: none; transition: color var(--transition);
}
.nav-link:hover, .nav-link.active { color: #fff; }
.nav-toggle {
    display: none; background: none; border: none; cursor: pointer;
    flex-direction: column; gap: 4px; padding: 4px;
}
.nav-toggle span { display: block; width: 20px; height: 1.5px; background: var(--text-secondary); border-radius: 1px; }

/* ── HERO ── */
.hero {
    position: relative; padding: 140px 0 90px; overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-grid {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(43,127,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(43,127,255,0.03) 1px, transparent 1px);
    background-size: 48px 48px;
}
.hero-glow {
    position: absolute; top: -180px; left: 40%; transform: translateX(-50%);
    width: 700px; height: 500px;
    background: radial-gradient(ellipse, rgba(43,127,255,0.1) 0%, transparent 70%);
}
.hero-glow-2 {
    position: absolute; bottom: -80px; right: -150px;
    width: 400px; height: 350px;
    background: radial-gradient(ellipse, rgba(34,211,238,0.04) 0%, transparent 70%);
}
.hero-content { position: relative; z-index: 1; max-width: 640px; }
.hero-tag {
    display: inline-flex; align-items: center; gap: 7px;
    font-family: var(--mono); font-size: 11px; font-weight: 500;
    color: var(--blue-bright); letter-spacing: 0.06em; text-transform: uppercase;
    margin-bottom: 20px;
    background: var(--blue-glow); padding: 5px 12px; border-radius: 16px;
    border: 1px solid rgba(43,127,255,0.15);
}
.hero-tag::before {
    content: ''; width: 5px; height: 5px; border-radius: 50%;
    background: var(--blue-bright); animation: pulse 2.5s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }

.hero h1 {
    font-size: clamp(32px, 4.5vw, 48px); font-weight: 700;
    line-height: 1.15; color: #fff; margin-bottom: 20px; letter-spacing: -0.02em;
}
.hero h1 .accent { color: var(--blue-bright); }
.hero-desc {
    font-size: 16px; color: var(--text-secondary);
    line-height: 1.7; margin-bottom: 36px; max-width: 520px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ── BUTTONS ── */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 11px 24px; border-radius: 8px; font-size: 14px;
    font-weight: 600; text-decoration: none; cursor: pointer;
    transition: all var(--transition); border: none; font-family: var(--sans);
}
.btn-primary {
    background: var(--blue); color: #fff;
    box-shadow: 0 1px 12px rgba(43,127,255,0.2);
}
.btn-primary:hover {
    background: var(--blue-bright); color: #fff;
    box-shadow: 0 2px 20px rgba(43,127,255,0.3); transform: translateY(-1px);
}
.btn-outline {
    background: transparent; color: var(--text);
    border: 1px solid var(--border-hover);
}
.btn-outline:hover { border-color: var(--blue); color: #fff; background: var(--blue-glow); }

/* ── SECTIONS ── */
.section { padding: 88px 0; }
.section-alt { background: var(--navy); }
.section-light {
    background: linear-gradient(180deg, #f1f4f9 0%, #e8ecf4 100%);
    color: #1a2236;
}
.section-light .section-title { color: #111827; }
.section-light .section-desc { color: #4b5563; }
.section-light .section-tag { color: var(--blue); }

.section-tag {
    display: inline-block; font-family: var(--mono); font-size: 11px;
    font-weight: 500; color: var(--blue-bright); letter-spacing: 0.08em;
    text-transform: uppercase; margin-bottom: 14px;
}
.section-title {
    font-size: clamp(24px, 3vw, 34px); font-weight: 700;
    line-height: 1.2; color: #fff; margin-bottom: 12px; letter-spacing: -0.01em;
}
.section-desc { font-size: 15px; color: var(--text-secondary); max-width: 520px; line-height: 1.7; }
.section-header { margin-bottom: 48px; }

/* ── STATS ── */
.stats-bar {
    padding: 48px 0;
    border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
    background: var(--navy);
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-value { display: block; font-size: 28px; font-weight: 700; color: #fff; font-family: var(--mono); margin-bottom: 4px; }
.stat-label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; }

/* ── PRODUCT CARDS ── */
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.product-card {
    background: var(--navy-card); border: 1px solid var(--border);
    border-radius: 12px; padding: 28px 24px;
    transition: all var(--transition); position: relative;
}
.product-card:hover {
    border-color: var(--border-hover); background: var(--navy-card-hover);
    transform: translateY(-2px); box-shadow: 0 12px 32px rgba(0,0,0,0.25);
}
.product-icon {
    width: 32px; height: 32px; border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 14px;
}
.product-icon svg { width: 16px; height: 16px; }
.product-icon.vpn { background: rgba(43,127,255,0.12); }
.product-icon.defender { background: rgba(52,211,153,0.12); }
.product-icon.remote { background: rgba(251,191,36,0.12); }
.product-card h3 { font-size: 17px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.product-status {
    display: inline-block; font-family: var(--mono); font-size: 9px;
    font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
    padding: 2px 8px; border-radius: 10px; margin-bottom: 10px;
}
.status-live { background: rgba(52,211,153,0.1); color: var(--green); border: 1px solid rgba(52,211,153,0.15); }
.status-beta { background: rgba(251,191,36,0.1); color: var(--amber); border: 1px solid rgba(251,191,36,0.15); }
.product-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; }
.product-link { font-size: 13px; font-weight: 600; color: var(--blue-bright); display: inline-flex; align-items: center; gap: 4px; }
.product-link:hover { color: var(--cyan); gap: 8px; }

/* ── R&D GRID ── */
.rd-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.rd-card {
    background: var(--navy-card); border: 1px solid var(--border);
    border-radius: 10px; padding: 24px 20px; transition: all var(--transition);
}
.rd-card:hover { border-color: var(--border-hover); background: var(--navy-card-hover); }
.rd-num { font-family: var(--mono); font-size: 11px; font-weight: 500; color: var(--text-muted); margin-bottom: 10px; }
.rd-card h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.rd-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* ── Light section R&D cards ── */
.section-light .rd-card {
    background: #fff; border-color: #e2e6ee;
}
.section-light .rd-card:hover { border-color: #c5cad6; background: #fff; box-shadow: 0 4px 16px rgba(0,0,0,0.06); }
.section-light .rd-card h4 { color: #111827; }
.section-light .rd-card p { color: #4b5563; }
.section-light .rd-num { color: var(--blue); }

/* ── PRINCIPLES ── */
.principles-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.principle {
    display: flex; gap: 14px; padding: 20px;
    background: var(--navy-card); border: 1px solid var(--border);
    border-radius: 10px; transition: all var(--transition);
}
.principle:hover { border-color: var(--border-hover); }
.principle-icon {
    flex-shrink: 0; width: 28px; height: 28px; border-radius: 6px;
    background: var(--blue-glow);
    display: flex; align-items: center; justify-content: center;
}
.principle-icon svg { width: 14px; height: 14px; stroke: var(--blue-bright); fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.principle h4 { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 3px; }
.principle p { font-size: 12px; color: var(--text-secondary); line-height: 1.55; }

/* ── CTA ── */
.cta-section {
    padding: 80px 0; text-align: center;
    background: var(--navy);
    border-top: 1px solid var(--border);
}
.cta-title { font-size: clamp(24px, 3vw, 34px); font-weight: 700; color: #fff; margin-bottom: 12px; }
.cta-desc { font-size: 15px; color: var(--text-secondary); margin-bottom: 28px; max-width: 440px; margin-left: auto; margin-right: auto; }
.cta-contacts { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ── FOOTER ── */
.footer {
    padding: 40px 0 28px; border-top: 1px solid var(--border);
    background: var(--navy-deep);
}
.footer-grid {
    display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 32px; margin-bottom: 32px;
}
.footer-brand-name {
    font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 8px;
    display: flex; align-items: center; gap: 8px;
}
.footer-brand-desc { font-size: 12px; color: var(--text-muted); line-height: 1.6; margin-bottom: 6px; }
.footer-company { font-size: 11px; color: var(--text-muted); }
.footer-col h4 {
    font-size: 11px; font-weight: 600; color: var(--text-muted);
    text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 12px;
}
.footer-col a { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
    display: flex; justify-content: space-between; align-items: center;
    padding-top: 20px; border-top: 1px solid var(--border);
    font-size: 11px; color: var(--text-muted);
}
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a { color: var(--text-muted); font-size: 11px; }
.footer-bottom-links a:hover { color: var(--text-secondary); }

/* ── ABOUT PAGE ── */
.page-hero {
    padding: 120px 0 48px; position: relative;
    border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: clamp(28px, 3.5vw, 42px); font-weight: 700; color: #fff; margin-bottom: 14px; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.about-text h3 { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.about-text p { font-size: 14px; color: var(--text-secondary); margin-bottom: 14px; line-height: 1.7; }
.values-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.value-card {
    padding: 24px; background: var(--navy-card);
    border: 1px solid var(--border); border-radius: 10px;
    transition: all var(--transition);
}
.value-card:hover { border-color: var(--border-hover); }
.value-card h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.value-card p { font-size: 12px; color: var(--text-secondary); line-height: 1.6; }

/* ── Light section values ── */
.section-light .value-card { background: #fff; border-color: #e2e6ee; }
.section-light .value-card:hover { border-color: #c5cad6; box-shadow: 0 4px 16px rgba(0,0,0,0.06); }
.section-light .value-card h4 { color: #111827; }
.section-light .value-card p { color: #4b5563; }

/* ── Light section principles ── */
.section-light .principle { background: #fff; border-color: #e2e6ee; }
.section-light .principle:hover { border-color: #c5cad6; }
.section-light .principle h4 { color: #111827; }
.section-light .principle p { color: #4b5563; }
.section-light .principle-icon { background: rgba(43,127,255,0.08); }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
    .products-grid, .rd-grid { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid { grid-template-columns: 1fr; }
    .principles-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
    .nav-links {
        display: none; position: fixed; top: 56px; left: 0; right: 0;
        background: rgba(8,14,26,0.98); backdrop-filter: blur(16px);
        flex-direction: column; padding: 20px; gap: 16px;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: flex; }
    .hero { padding: 110px 0 56px; }
    .hero h1 { font-size: 28px; }
    .products-grid, .rd-grid, .principles-grid, .values-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .footer-grid { grid-template-columns: 1fr; gap: 20px; }
    .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
    .section { padding: 56px 0; }
    .cta-contacts { flex-direction: column; align-items: center; }
}