:root {
    --color-primary: #003366;
    --color-primary-light: #004d99;
    --color-primary-dark: #001f3f;
    --color-secondary: #004080;
    --color-secondary-light: #0059b3;
    --color-accent: #FFB700;
    --color-accent-hover: #e0a100;

    --color-text-dark: #1a1a1a;
    --color-text-body: #4a4a4a;
    --color-text-light: #FFFFFF;
    --color-text-muted: #64748b;
    --color-background: #F8FAFC;
    --color-surface: #FFFFFF;
    --color-border: #e2e8f0;

    --gradient-hero: linear-gradient(135deg, rgba(0, 25, 50, 0.85) 0%, rgba(0, 51, 102, 0.75) 100%);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
    --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.025);

    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Lato', sans-serif;

    --z-nav: 1020;
    --z-toggle: 1030;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-background);
    color: var(--color-text-body);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
}

a {
    color: var(--color-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-light);
    text-decoration: none;
}

ul,
ol {
    list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.1;
    color: var(--color-primary-dark);
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3rem;
    letter-spacing: -0.03em;
}

h2 {
    font-size: 2.5rem;
    color: var(--color-primary);
}

h3 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.main-header {
    background-color: var(--color-surface);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: var(--z-nav);
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.25rem;
    padding-bottom: 1.25rem;
}

.logo img {
    height: 50px;
    width: auto;
}

.main-nav {
    display: none;
}

.nav-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: var(--z-toggle);
}

.nav-toggle .hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    position: relative;
    transition: background-color 0.2s ease-in-out;
}

.nav-toggle .hamburger::before,
.nav-toggle .hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
    left: 0;
    transition: transform 0.2s ease-in-out;
}

.nav-toggle .hamburger::before {
    top: -7px;
}

.nav-toggle .hamburger::after {
    bottom: -7px;
}

.main-nav.is-active {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-surface);
    padding: 1rem 0;
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.main-nav ul li a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--color-text-dark);
    font-weight: 600;
    font-family: var(--font-heading);
}

.nav-toggle.is-active .hamburger {
    background-color: transparent;
}

.nav-toggle.is-active .hamburger::before {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.is-active .hamburger::after {
    transform: rotate(-45deg) translate(5px, -5px);
}

.hero-section {
    background-image: url('../images/img-hero.png');
    background-size: cover;
    background-position: center;
    background-color: var(--color-primary-dark);
    text-align: center;
    padding: 8rem 0;
    position: relative;
    color: var(--color-text-light);
    background-attachment: fixed;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-hero);
    z-index: 0;
}

.hero-section h1,
.hero-section p,
.hero-section .cta-button {
    position: relative;
    z-index: 1;
}

.hero-section h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: var(--color-text-light);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-section p {
    font-size: 1.35rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 3rem;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
}

.cta-button {
    display: inline-block;
    background-color: var(--color-accent);
    color: var(--color-primary-dark);
    padding: 1rem 3rem;
    border-radius: 50px;
    font-weight: 700;
    font-family: var(--font-heading);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-lg);
    border: 2px solid transparent;
}

.cta-button:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-hover);
    background-color: var(--color-accent-hover);
}

@media (max-width: 767px) {
    .hero-section {
        background-attachment: scroll;
    }
}

.content-section {
    padding: 5rem 0;
}

.content-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .fade-in-up {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

.promo-grid {
    display: grid;
    gap: 3rem;
}

.card {
    background-color: var(--color-surface);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-smooth);
    position: relative;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.card__image {
    overflow: hidden;
    height: 240px;
}

.card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.card:hover .card__image img {
    transform: scale(1.05);
}

.card__content {
    padding: 2.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card__title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-primary-dark);
}

.card__text {
    flex-grow: 1;
    margin-bottom: 2rem;
    color: var(--color-text-body);
    font-size: 1.05rem;
}

.card__link {
    display: inline-block;
    color: var(--color-primary);
    font-weight: 700;
    font-family: var(--font-heading);
    align-self: flex-start;
    transition: all var(--transition-fast);
    padding: 0;
    background: none;
    border-radius: 0;
    text-align: left;
    position: relative;
    padding-bottom: 2px;
}

.card__link::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--color-accent);
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform 0.3s ease-out;
}

.card__link:hover {
    background-color: transparent;
    color: var(--color-primary-dark);
}

.card__link:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

.main-footer {
    background-color: var(--color-primary);
    color: rgba(255, 255, 255, 0.85);
    padding-top: 4rem;
    margin-top: 5rem;
}

.footer-columns {
    display: flex;
    flex-wrap: wrap;
    gap: 3rem;
    padding-bottom: 3rem;
}

.footer-column {
    flex: 1 1 220px;
}

.footer-column h3 {
    color: var(--color-text-light);
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

.footer-column a {
    color: rgba(255, 255, 255, 0.85);
}

.footer-column a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    padding: 2rem 0;
    text-align: center;
    font-size: 0.9rem;
}


/* ------------------- */
/* DESKTOP STYLES      */
/* ------------------- */

@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }

    .main-nav {
        display: block;
        position: static;
        width: auto;
        background-color: transparent;
        box-shadow: none;
        padding: 0;
    }

    .main-nav ul {
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 2rem;
    }

    .main-nav ul li {
        width: auto;
        position: relative;
    }

    .main-nav ul li a {
        padding: 0.25rem 0;
        border-bottom: 2px solid transparent;
        color: var(--color-text-dark);
        font-weight: 600;
    }

    .main-nav ul li a:hover {
        color: var(--color-primary);
        border-bottom-color: var(--color-primary);
        text-decoration: none;
    }

    .main-nav .submenu {
        display: none;
        position: absolute;
        top: 120%;
        left: -1rem;
        background-color: var(--color-surface);
        border-radius: 8px;
        box-shadow: var(--shadow-lg);
        min-width: 220px;
        z-index: 100;
        padding: 0.5rem 0;
    }

    .main-nav li.has-submenu.is-active>.submenu,
    .main-nav li.has-submenu:hover>.submenu,
    .main-nav li.has-submenu:focus-within>.submenu {
        display: block;
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    a:focus {
        outline: 2px solid var(--color-accent);
        outline-offset: 2px;
    }

    .submenu li a:hover {
        background-color: #F8F9FA;
        color: var(--color-primary);
        border-bottom-color: transparent;
    }

    .promo-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .promo-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .hero-section h1 {
        font-size: 3.5rem;
    }
}