:root {
    --xt-navy: #071326;
    --xt-navy-light: #0d2142;
    --xt-blue: #0066cc;
    --xt-cyan: #00b4d8;
    --xt-accent: #f59e0b;
    --xt-bg-light: #f8fafc;
    --xt-text-dark: #0f172a;
    --xt-text-muted: #475569;
}

html {
    scroll-behavior: smooth;
    font-family: 'Inter', sans-serif;
}

body {
    color: var(--xt-text-dark);
    background-color: #ffffff;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, .xt-heading {
    font-family: 'Plus Jakarta Sans', sans-serif;
    letter-spacing: -0.02em;
}

/* Loader inicial */
.xt-loader-screen {
    position: fixed;
    inset: 0;
    background: radial-gradient(circle at top right, var(--xt-navy-light), var(--xt-navy));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.xt-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(0, 180, 216, 0.2);
    border-top-color: var(--xt-cyan);
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Navbar */
.xt-navbar {
    background: rgba(7, 19, 38, 0.94);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.3s ease;
}

    .xt-navbar .nav-link {
        color: rgba(255, 255, 255, 0.85);
        font-size: 0.88rem;
        font-weight: 600;
        letter-spacing: 0.04em;
        padding: 0.5rem 0.9rem;
        transition: color 0.2s;
    }

        .xt-navbar .nav-link:hover {
            color: var(--xt-cyan);
        }

.btn-xt-core {
    background: linear-gradient(135deg, var(--xt-blue), var(--xt-cyan));
    color: #fff;
    border: none;
    font-weight: 600;
    font-size: 0.88rem;
    padding: 0.55rem 1.2rem;
    border-radius: 8px;
    box-shadow: 0 4px 14px rgba(0, 180, 216, 0.25);
    transition: transform 0.2s, box-shadow 0.2s;
}

    .btn-xt-core:hover {
        color: #fff;
        transform: translateY(-1px);
        box-shadow: 0 6px 20px rgba(0, 180, 216, 0.4);
    }

/* Hero Section */
.xt-hero {
    background: radial-gradient(circle at 80% 20%, #102a54 0%, var(--xt-navy) 65%);
    color: #ffffff;
    padding-top: 7.5rem;
    padding-bottom: 5.5rem;
    position: relative;
}

.xt-badge {
    display: inline-block;
    background: rgba(0, 180, 216, 0.14);
    border: 1px solid rgba(0, 180, 216, 0.35);
    color: var(--xt-cyan);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    padding: 0.4rem 0.9rem;
    border-radius: 50px;
}

/* Tarjetas modernas */
.xt-card {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 2rem;
    height: 100%;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

    .xt-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 20px 35px -10px rgba(7, 19, 38, 0.1);
        border-color: var(--xt-cyan);
    }

.xt-card-dark {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 1.8rem;
    height: 100%;
    color: #fff;
    transition: border-color 0.25s ease, background 0.25s ease;
}

    .xt-card-dark:hover {
        background: rgba(255, 255, 255, 0.07);
        border-color: var(--xt-cyan);
    }

.xt-icon-box {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    background: rgba(0, 102, 204, 0.1);
    color: var(--xt-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
}

.xt-section-dark {
    background-color: var(--xt-navy);
    color: #ffffff;
}

.xt-section-light {
    background-color: var(--xt-bg-light);
}

.xt-stat-number {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 2.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff, var(--xt-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}