/* ==========================================================================
   Balazs Koncz — Personal Site
   Custom algorithmic trading systems & AI-assisted automation
   ========================================================================== */

:root {
    /* Color system: light institutional palette (max 5 core colors) */
    --bg: #f6f7f9;
    --bg-elevated: #eef1f5;
    --surface: #ffffff;
    --border: #e1e5ec;
    --text: #0f1419;
    --text-muted: #52606f;
    --text-faint: #8a94a3;

    /* Single accent */
    --accent: #2f6fed;
    --accent-dim: rgba(47, 111, 237, 0.08);
    --accent-border: rgba(47, 111, 237, 0.32);

    --radius: 10px;
    --maxw: 1160px;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
}

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

html {
    scroll-behavior: smooth;
    background: var(--bg);
}

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 24px;
}

h1, h2, h3, h4 {
    line-height: 1.2;
    letter-spacing: -0.02em;
    font-weight: 600;
    text-wrap: balance;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); }
h3 { font-size: 1.25rem; }

p { text-wrap: pretty; }

a { color: inherit; text-decoration: none; }

section { position: relative; }

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 22px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.18s ease;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
}
.btn-primary:hover { background: #245bd0; border-color: #245bd0; transform: translateY(-1px); }

.btn-ghost {
    background: transparent;
    color: var(--text);
    border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--accent-border); background: var(--accent-dim); }

.btn-outline {
    background: transparent;
    color: var(--text);
    border-color: var(--border);
}
.btn-outline:hover { border-color: var(--accent-border); }

.btn-large { padding: 15px 28px; font-size: 1rem; }
.btn-full { width: 100%; }

/* --------------------------------------------------------------------------
   Grid background texture
   -------------------------------------------------------------------------- */
.grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(to right, rgba(15, 20, 25, 0.05) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(15, 20, 25, 0.05) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
    pointer-events: none;
}

/* Subtle global grid on body for continuity */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(to right, rgba(15, 20, 25, 0.03) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(15, 20, 25, 0.03) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
    z-index: 0;
}

.container, .header { position: relative; z-index: 1; }

/* --------------------------------------------------------------------------
   Header / Nav
   -------------------------------------------------------------------------- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(246, 247, 249, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo {
    display: flex;
    align-items: baseline;
    gap: 2px;
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}
.logo-name { color: var(--text); }
.logo-dot { color: var(--accent); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
    margin-left: auto;
}
.nav-link {
    font-size: 0.92rem;
    color: var(--text-muted);
    transition: color 0.15s;
}
.nav-link:hover, .nav-link.active { color: var(--text); }

.nav-cta { padding: 9px 18px; font-size: 0.9rem; }

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.25s;
}
.mobile-menu-btn.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --------------------------------------------------------------------------
   Section headers
   -------------------------------------------------------------------------- */
.section-label {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 12px;
}

.section-header {
    max-width: 640px;
    margin: 0 auto 56px;
    text-align: center;
}
.section-header .section-label { margin-bottom: 10px; }
.section-subtitle {
    color: var(--text-muted);
    font-size: 1.05rem;
    margin-top: 12px;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
    padding: 90px 0 70px;
    overflow: hidden;
}
.hero-content { text-align: center; }
.hero-label {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 20px;
}
.hero h1 { margin-bottom: 20px; }
.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto 36px;
}

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
    margin-bottom: 40px;
}
.badge {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 18px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.badge-icon {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--accent);
    font-size: 0.95rem;
}
.badge-text { font-size: 0.9rem; color: var(--text-muted); }

.hero-ctas { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }

/* --------------------------------------------------------------------------
   Trusted By (companies band)
   -------------------------------------------------------------------------- */
.trusted-by {
    padding: 48px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.companies-label {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-faint);
    margin-bottom: 24px;
    text-align: center;
}
.companies {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 28px;
}
.company { display: flex; flex-direction: column; gap: 2px; align-items: center; }
.company-name { font-weight: 600; font-size: 1.05rem; }
.company-type { font-size: 0.82rem; color: var(--text-faint); }
.company-divider { width: 1px; height: 34px; background: var(--border); }

/* --------------------------------------------------------------------------
   Capabilities
   -------------------------------------------------------------------------- */
.capabilities { padding: 90px 0; }
.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.capability-card {
    padding: 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color 0.2s, transform 0.2s;
}
.capability-card:hover { border-color: var(--accent-border); transform: translateY(-2px); }
.capability-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: var(--accent-dim);
    color: var(--accent);
    margin-bottom: 18px;
}
.capability-card h3 { margin-bottom: 8px; }
.capability-card p { color: var(--text-muted); font-size: 0.95rem; }

/* --------------------------------------------------------------------------
   Philosophy
   -------------------------------------------------------------------------- */
.philosophy {
    padding: 90px 0;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.philosophy-content {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 56px;
    align-items: start;
}
.philosophy-text h2 { margin: 10px 0 16px; }
.philosophy-description { color: var(--text-muted); font-size: 1.05rem; }
.principles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}
.principle { display: flex; align-items: center; gap: 12px; font-size: 0.98rem; }
.principle-marker {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Process
   -------------------------------------------------------------------------- */
.process { padding: 90px 0; }
.process-steps {
    display: flex;
    align-items: stretch;
    justify-content: space-between;
    gap: 0;
    flex-wrap: wrap;
}
.process-step {
    flex: 1;
    min-width: 200px;
    padding: 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.step-number {
    font-family: var(--font-mono);
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 14px;
}
.step-content h3 { margin-bottom: 8px; font-size: 1.1rem; }
.step-content p { color: var(--text-muted); font-size: 0.92rem; }
.process-connector {
    align-self: center;
    width: 24px;
    height: 1px;
    background: var(--border);
    flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Services
   -------------------------------------------------------------------------- */
.services {
    padding: 90px 0;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 920px;
    margin: 0 auto;
}
.service-card {
    position: relative;
    padding: 32px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
}
.service-card.featured { border-color: var(--accent-border); }
.service-badge {
    position: absolute;
    top: -12px;
    left: 32px;
    background: var(--accent);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.service-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    padding-bottom: 20px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
}
.service-price { text-align: right; }
.price { display: block; font-size: 1.6rem; font-weight: 700; font-family: var(--font-mono); }
.price-note { font-size: 0.78rem; color: var(--text-faint); }
.service-description { color: var(--text-muted); margin-bottom: 20px; font-size: 0.96rem; }
.service-features { list-style: none; margin-bottom: 28px; display: grid; gap: 10px; }
.service-features li {
    position: relative;
    padding-left: 26px;
    font-size: 0.93rem;
    color: var(--text-muted);
}
.service-features li::before {
    content: "";
    position: absolute;
    left: 4px; top: 8px;
    width: 6px; height: 10px;
    border-right: 2px solid var(--accent);
    border-bottom: 2px solid var(--accent);
    transform: rotate(45deg);
}
.service-body { flex: 1; }
.service-footer { display: grid; gap: 10px; }

/* --------------------------------------------------------------------------
   Founder / About
   -------------------------------------------------------------------------- */
.founder { padding: 90px 0; }
.founder-content {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 56px;
    align-items: center;
}
.founder-image img {
    width: 100%;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    filter: grayscale(15%);
}
.founder-text h2 { margin: 10px 0 20px; }
.founder-intro { color: var(--text-muted); font-size: 1.05rem; margin-bottom: 24px; }
.founder-mission {
    padding: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius);
    margin-bottom: 28px;
}
.founder-mission h4 {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 8px;
}
.founder-mission p { color: var(--text-muted); }

/* --------------------------------------------------------------------------
   Partners
   -------------------------------------------------------------------------- */
.partners {
    padding: 90px 0;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.partners-track-wrapper { position: relative; }
.partners-track {
    display: flex;
    align-items: stretch;
    gap: 20px;
    overflow-x: auto;
    scroll-behavior: smooth;
    padding: 4px;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}
/* When few items, center them and prevent scroll feel */
.partners-track.is-static { justify-content: center; flex-wrap: wrap; }
.partners-track::-webkit-scrollbar { height: 6px; }
.partners-track::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.partner-card {
    flex: 0 0 auto;
    width: 240px;
    min-height: 130px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color 0.2s, transform 0.2s;
}
.partner-card:hover { border-color: var(--accent-border); transform: translateY(-2px); }
.partner-card img {
    max-width: 100%;
    max-height: 74px;
    object-fit: contain;
    opacity: 0.85;
    transition: opacity 0.2s;
}
.partner-card:hover img { opacity: 1; }
.partner-card.partner-badge img { max-height: 110px; }

/* Scroll controls */
.partners-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 42px; height: 42px;
    border-radius: 50%;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 3;
    transition: all 0.18s;
}
.partners-nav:hover { border-color: var(--accent-border); background: var(--accent-dim); }
.partners-nav.prev { left: -8px; }
.partners-nav.next { right: -8px; }
.partners-nav[hidden] { display: none; }

/* --------------------------------------------------------------------------
   Strategies (public strategy platforms)
   -------------------------------------------------------------------------- */
.strategies { padding: 90px 0; }
.strategies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    max-width: 860px;
    margin: 0 auto;
}
.strategy-card {
    display: flex;
    flex-direction: column;
    padding: 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color 0.2s, transform 0.2s;
}
.strategy-card:hover { border-color: var(--accent-border); transform: translateY(-2px); }
.strategy-platform {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-faint);
    margin-bottom: 10px;
}
.strategy-card h3 { margin-bottom: 8px; }
.strategy-card p { color: var(--text-muted); font-size: 0.93rem; flex: 1; margin-bottom: 20px; }
.strategy-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    font-weight: 500;
    font-size: 0.92rem;
}
.strategy-link svg { transition: transform 0.18s; }
.strategy-card:hover .strategy-link svg { transform: translate(2px, -2px); }

/* --------------------------------------------------------------------------
   Substack CTA
   -------------------------------------------------------------------------- */
.substack {
    padding: 70px 0;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.substack-inner {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
    padding: 44px 32px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.substack-inner .section-label { margin-bottom: 12px; }
.substack-inner h2 { margin-bottom: 12px; }
.substack-inner p { color: var(--text-muted); margin-bottom: 26px; }

/* --------------------------------------------------------------------------
   Final CTA
   -------------------------------------------------------------------------- */
.cta { padding: 100px 0; text-align: center; }
.cta-content { max-width: 640px; margin: 0 auto; }
.cta-content h2 { margin-bottom: 16px; }
.cta-content > p { color: var(--text-muted); font-size: 1.1rem; margin-bottom: 32px; }
.cta-buttons { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    padding: 64px 0 32px;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
}
.footer-content {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}
.footer-brand .footer-logo {
    display: flex;
    align-items: baseline;
    gap: 2px;
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 14px;
}
.footer-brand p { color: var(--text-muted); font-size: 0.92rem; max-width: 280px; }
.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}
.footer-social a {
    width: 38px; height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-muted);
    transition: all 0.18s;
}
.footer-social a:hover {
    color: var(--text);
    border-color: var(--accent-border);
    background: var(--accent-dim);
}
.footer-links h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-faint);
    margin-bottom: 16px;
}
.footer-links ul { list-style: none; display: grid; gap: 10px; }
.footer-links a, .footer-links span { color: var(--text-muted); font-size: 0.92rem; cursor: pointer; }
.footer-links a:hover { color: var(--text); }
.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}
.footer-bottom p { color: var(--text-faint); font-size: 0.85rem; }
.footer-legal { display: flex; gap: 20px; }
.footer-legal a { color: var(--text-faint); font-size: 0.85rem; }
.footer-legal a:hover { color: var(--text); }

/* --------------------------------------------------------------------------
   Cookie banner (discreet, non-overlaying)
   -------------------------------------------------------------------------- */
.cookie-banner {
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: auto;
    max-width: 380px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 20px;
    z-index: 200;
    box-shadow: 0 12px 40px rgba(15, 20, 25, 0.14);
    transform: translateY(150%);
    opacity: 0;
    transition: transform 0.35s ease, opacity 0.35s ease;
}
.cookie-banner.show { transform: translateY(0); opacity: 1; }
.cookie-banner p { font-size: 0.86rem; color: var(--text-muted); margin-bottom: 14px; }
.cookie-banner a { color: var(--accent); }
.cookie-actions { display: flex; gap: 10px; }
.cookie-actions .btn { padding: 8px 16px; font-size: 0.85rem; }

/* --------------------------------------------------------------------------
   Legal pages
   -------------------------------------------------------------------------- */
.legal { padding: 70px 0 90px; }
.legal-content { max-width: 760px; margin: 0 auto; }
.legal-content .back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 32px;
}
.legal-content .back-link:hover { color: var(--text); }
.legal-content h1 { margin-bottom: 8px; }
.legal-updated { color: var(--text-faint); font-family: var(--font-mono); font-size: 0.82rem; margin-bottom: 36px; }
.legal-content h2 { font-size: 1.35rem; margin: 36px 0 12px; }
.legal-content p, .legal-content li { color: var(--text-muted); font-size: 0.98rem; margin-bottom: 12px; }
.legal-content ul { padding-left: 22px; margin-bottom: 12px; }
.legal-disclaimer {
    padding: 20px;
    background: var(--surface);
    border: 1px solid var(--accent-border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius);
    margin: 24px 0;
}
.legal-disclaimer p { color: var(--text); margin: 0; }

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 860px) {
    .capabilities-grid { grid-template-columns: repeat(2, 1fr); }
    .philosophy-content { grid-template-columns: 1fr; gap: 32px; }
    .founder-content { grid-template-columns: 1fr; gap: 32px; }
    .services-grid { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr 1fr; gap: 32px; }
    .process-connector { display: none; }
    .process-steps { gap: 16px; }
    .process-step { flex: 1 1 45%; }
}

@media (max-width: 680px) {
    .mobile-menu-btn { display: flex; order: 3; }
    .nav-cta { display: none; }
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        background: var(--bg-elevated);
        border-bottom: 1px solid var(--border);
        padding: 0 24px;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease, padding 0.3s ease;
    }
    .nav-links.active { max-height: 320px; padding: 12px 24px 20px; }
    .nav-links li { width: 100%; }
    .nav-link { display: block; padding: 12px 0; width: 100%; }

    .capabilities-grid { grid-template-columns: 1fr; }
    .principles-grid { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr; }
    .process-step { flex: 1 1 100%; }
    .hero-badges { flex-direction: column; align-items: stretch; }
    .companies { gap: 18px; }
    .cookie-banner { left: 12px; right: 12px; max-width: none; bottom: 12px; }
}