/* === Reset & Base === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --black: #0a0a0a;
    --white: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-400: #a3a3a3;
    --gray-600: #525252;
    --gray-800: #262626;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --radius: 12px;
    --max-width: 1200px;
}

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--white);
    color: var(--black);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

/* === Typography === */
h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 700; line-height: 1.08; letter-spacing: -0.03em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; line-height: 1.15; letter-spacing: -0.02em; }
h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.3; }
h4 { font-size: 0.8rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray-400); margin-bottom: 6px; }

.section-tag {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 12px;
}

.section-sub {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 600px;
    margin-top: 16px;
    line-height: 1.7;
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--black);
    color: var(--white);
}
.btn-primary:hover { background: var(--gray-800); transform: translateY(-1px); }

.btn-outline {
    background: transparent;
    color: var(--black);
    border: 1.5px solid var(--gray-200);
}
.btn-outline:hover { border-color: var(--black); }

/* === Nav === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 20px 0;
    transition: all 0.3s ease;
}

.nav.scrolled {
    background: rgba(250, 250, 250, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 14px 0;
    border-bottom: 1px solid var(--gray-200);
}

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

.nav-logo {
    font-size: 1.15rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--black);
    letter-spacing: -0.02em;
}
.nav-logo span { font-weight: 400; color: var(--gray-400); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 36px;
    list-style: none;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 450;
    text-decoration: none;
    color: var(--gray-600);
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--black); }

.nav-cta {
    padding: 10px 20px !important;
    background: var(--black);
    color: var(--white) !important;
    border-radius: 8px;
}
.nav-cta:hover { background: var(--gray-800); color: var(--white) !important; }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--black); margin: 5px 0; transition: all 0.3s; }

/* === Hero === */
.hero {
    padding: 180px 0 120px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
}

.hero-tag {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--gray-400);
    letter-spacing: 0.06em;
    margin-bottom: 24px;
}

.hero-sub {
    font-size: 1.2rem;
    color: var(--gray-600);
    max-width: 640px;
    margin-top: 24px;
    line-height: 1.7;
}

.hero-actions {
    margin-top: 40px;
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* === Ventures === */
.ventures { background: var(--gray-100); }

.venture-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    margin-top: 48px;
}

.venture-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 36px;
    border: 1px solid var(--gray-200);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.venture-card:hover {
    border-color: var(--gray-400);
    box-shadow: 0 8px 30px rgba(0,0,0,0.04);
}

.venture-icon {
    width: 44px;
    height: 44px;
    margin-bottom: 20px;
    color: var(--accent);
}
.venture-icon svg { width: 100%; height: 100%; }

.venture-card h3 { margin-bottom: 12px; }
.venture-card > p { color: var(--gray-600); font-size: 0.95rem; line-height: 1.65; }

.venture-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
    list-style: none;
}
.venture-tags li {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 5px 12px;
    background: var(--gray-100);
    border-radius: 20px;
    color: var(--gray-600);
}

/* === Technology === */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
    margin-top: 48px;
}

.tech-card {
    padding: 32px;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    text-decoration: none;
    color: var(--black);
    transition: all 0.2s;
}
.tech-card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.08);
    transform: translateY(-2px);
}
.tech-card h3 { margin-bottom: 10px; }
.tech-card p { font-size: 0.9rem; color: var(--gray-600); line-height: 1.6; }

/* === Credibility === */
.credibility { padding: 80px 0; border-top: 1px solid var(--gray-200); border-bottom: 1px solid var(--gray-200); }

.cred-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.cred-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}
.cred-label {
    display: block;
    font-size: 0.85rem;
    color: var(--gray-400);
    margin-top: 4px;
}

/* === Partners === */
.partners {
    padding: 60px 0;
    text-align: center;
}
.partners-label {
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--gray-400);
    margin-bottom: 28px;
}
.partners-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 32px 48px;
}
.partners-row span {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--gray-600);
}

/* === About === */
.about-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 80px;
    align-items: start;
}
.about-grid p { color: var(--gray-600); margin-top: 16px; line-height: 1.75; font-size: 1.05rem; }
.about-details { display: flex; flex-direction: column; gap: 28px; padding-top: 40px; }
.about-detail p { color: var(--gray-600); font-size: 0.95rem; margin-top: 0; line-height: 1.6; }

/* === Careers === */
.careers { background: var(--gray-100); }
.careers-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.careers-inner > div:first-child p { color: var(--gray-600); margin-top: 16px; font-size: 1.05rem; line-height: 1.75; }
.careers-box {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 36px;
}
.careers-box h3 { margin-bottom: 12px; }
.careers-box p { color: var(--gray-600); font-size: 0.95rem; line-height: 1.65; margin-bottom: 24px; }

/* === Contact === */
.contact {
    background: var(--black);
    color: var(--white);
    text-align: center;
}
.contact-inner { max-width: 600px; margin: 0 auto; }
.contact-inner p { color: var(--gray-400); margin-top: 16px; font-size: 1.05rem; line-height: 1.7; }
.contact-links { margin-top: 36px; display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.contact .btn-primary { background: var(--white); color: var(--black); }
.contact .btn-primary:hover { background: var(--gray-200); }
.contact .btn-outline { border-color: var(--gray-600); color: var(--white); }
.contact .btn-outline:hover { border-color: var(--white); }

/* === Footer === */
.footer {
    padding: 24px 0;
    border-top: 1px solid var(--gray-200);
}
.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--gray-400);
}
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--gray-400); text-decoration: none; }
.footer-links a:hover { color: var(--black); }

/* === Mobile === */
.desktop-only { display: inline; }

@media (max-width: 768px) {
    .desktop-only { display: none; }

    .nav-toggle { display: block; }
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 80px 32px;
        gap: 24px;
        transition: right 0.3s ease;
        box-shadow: -4px 0 30px rgba(0,0,0,0.1);
    }
    .nav-links.open { right: 0; }
    .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .nav-toggle.active span:nth-child(2) { opacity: 0; }
    .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

    .hero { padding: 140px 0 80px; }
    h1 { font-size: 2.2rem; }

    .venture-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .cred-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
    .about-grid { grid-template-columns: 1fr; gap: 48px; }
    .careers-inner { grid-template-columns: 1fr; }
    .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
}