/**
 * DAT Servicios Aéreos — estilos base
 */

:root {
    --dat-navy: #001d3d;
    --dat-navy-mid: #003566;
    --dat-white: #ffffff;
    --dat-text: #3d4f63;
    --dat-text-muted: #6b7c8f;
    --nav-height: 88px;
    --nav-height-mobile: 72px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
    width: 100%;
    overflow-x: hidden;
}

body {
    font-family: 'Montserrat', 'Segoe UI', sans-serif;
    background: var(--dat-white);
    color: var(--dat-text);
    line-height: 1.6;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
}

/* —— Header / Navbar —— */
body > header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--dat-white);
    min-height: var(--nav-height);
    padding: 0 clamp(1rem, 3vw, 2.5rem);
    display: flex;
    align-items: center;
    box-shadow: 0 1px 0 rgba(0, 29, 61, 0.08);
}

body > header nav.navbar {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: clamp(1rem, 3vw, 2.5rem);
}

.nav-logo {
    flex-shrink: 0;
    line-height: 0;
    text-decoration: none;
    grid-column: 1;
    justify-self: start;
}

.nav-logo img {
    height: clamp(44px, 5vw, 56px);
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    list-style: none;
    gap: clamp(1.25rem, 2.5vw, 2.25rem);
    grid-column: 2;
    justify-self: center;
    margin: 0;
}

.nav-links a {
    color: var(--dat-navy);
    font-size: clamp(0.78rem, 1vw, 0.88rem);
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-decoration: none;
    position: relative;
    padding: 0.35rem 0;
    white-space: nowrap;
    transition: opacity 0.2s ease;
}

.nav-links a:hover {
    opacity: 0.7;
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    background: var(--dat-navy);
}

.nav-cta {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.72rem 1.35rem;
    background: var(--dat-navy);
    color: var(--dat-white);
    font-family: inherit;
    font-size: clamp(0.72rem, 0.95vw, 0.82rem);
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
    grid-column: 3;
    justify-self: end;
}

.nav-cta:hover {
    background: var(--dat-navy-mid);
    transform: translateY(-1px);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--dat-navy);
    font-size: 1.4rem;
    cursor: pointer;
    padding: 0.25rem;
    line-height: 1;
    grid-column: 3;
    justify-self: end;
}

.nav-mobile-panel {
    display: none;
}

@media (max-width: 900px) {
    html {
        scroll-padding-top: var(--nav-height-mobile);
    }

    body > header {
        min-height: var(--nav-height-mobile);
    }

    .nav-links,
    .nav-cta {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    body > header nav.navbar.is-open .nav-mobile-panel {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--dat-white);
        padding: 1rem clamp(1rem, 4vw, 2rem) 1.5rem;
        box-shadow: 0 8px 24px rgba(0, 29, 61, 0.12);
        gap: 0.25rem;
    }

    body > header nav.navbar {
        position: relative;
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
    }

    .nav-logo {
        grid-column: auto;
    }

    .mobile-menu-btn {
        grid-column: auto;
        margin-left: auto;
    }

    .nav-mobile-panel a {
        color: var(--dat-navy);
        font-size: 0.9rem;
        font-weight: 600;
        letter-spacing: 0.05em;
        text-transform: uppercase;
        text-decoration: none;
        padding: 0.75rem 0;
        border-bottom: 1px solid rgba(0, 29, 61, 0.08);
    }

    .nav-mobile-panel .nav-cta {
        display: inline-flex;
        margin-top: 0.75rem;
        width: 100%;
        text-align: center;
        color: var(--dat-white);
    }
}