/* ==================== ROOT VARIABLES ==================== */
:root {
    /* Color Palette - Tonos celestes sobrios */
    --color-primary: #2C5F7C;
    --color-primary-light: #3A7A9E;
    --color-primary-dark: #1E4158;
    --color-secondary: #4A90A4;
    --color-accent: #5FA8C1;
    --color-light-blue: #E8F4F8;
    --color-medium-blue: #B8D8E8;
    
    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-gray-100: #F8F9FA;
    --color-gray-200: #E9ECEF;
    --color-gray-300: #DEE2E6;
    --color-gray-400: #CED4DA;
    --color-gray-500: #ADB5BD;
    --color-gray-600: #6C757D;
    --color-gray-700: #495057;
    --color-gray-800: #343A40;
    --color-gray-900: #212529;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(44, 95, 124, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(44, 95, 124, 0.1), 0 2px 4px -1px rgba(44, 95, 124, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(44, 95, 124, 0.1), 0 4px 6px -2px rgba(44, 95, 124, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(44, 95, 124, 0.1), 0 10px 10px -5px rgba(44, 95, 124, 0.04);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Container */
    --container-width: 1200px;
    --header-height: 4.5rem;
}

/* ==================== RESET & BASE ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* ==================== UTILITIES ==================== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section__header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section__title {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-md);
    position: relative;
    display: inline-block;
}

.section__title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
    border-radius: var(--radius-sm);
}

.section__description {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    max-width: 600px;
    margin: var(--spacing-lg) auto 0;
}

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    font-size: 1rem;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-full {
    width: 100%;
}

/* ==================== HEADER ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

.nav__logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 65px;
    width: auto;
}

.nav__list {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav__link {
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-700);
    transition: color var(--transition-fast);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-primary);
}

.nav__link:hover::after,
.nav__link.active::after {
    width: 100%;
}

.nav__toggle,
.nav__close {
    display: none;
}

/* ==================== HERO SECTION ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--color-light-blue) 0%, var(--color-white) 100%);
    padding-top: var(--header-height);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(90, 168, 193, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero__content {
    animation: fadeInUp 0.8s ease-out;
}

.hero__title {
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-dark);
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.hero__description {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero__buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero__image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero__img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    position: relative;
    animation: float 6s ease-in-out infinite;
    border: 5px solid var(--color-light-blue);
}

/* ==================== SERVICES SECTION ==================== */
.services {
    padding: var(--spacing-3xl) 0;
    background: var(--color-white);
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.service__card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.service__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.service__card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-medium-blue);
}

.service__card:hover::before {
    transform: scaleX(1);
}

.service__icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-light-blue), var(--color-medium-blue));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-base);
}

.service__icon svg {
    width: 32px;
    height: 32px;
    stroke: var(--color-primary);
}

.service__card:hover .service__icon {
    transform: scale(1.1);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

.service__card:hover .service__icon svg {
    stroke: var(--color-white);
}

.service__title {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.service__description {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.service__features {
    list-style: none;
}

.service__features li {
    padding: var(--spacing-xs) 0;
    color: var(--color-gray-700);
    position: relative;
    padding-left: var(--spacing-lg);
}

.service__features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-secondary);
    font-weight: var(--font-weight-bold);
}

/* ==================== ABOUT SECTION ==================== */
.about {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-light-blue) 100%);
}

.about__content {
    display: grid;
    gap: var(--spacing-3xl);
}

.about__text {
    max-width: 800px;
    margin: 0 auto;
}

.about__description {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.about__features {
    display: grid;
    gap: var(--spacing-lg);
}

.about__feature {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.about__feature-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    flex-shrink: 0;
}

.about__feature h4 {
    font-size: 1.125rem;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-xs);
}

.about__feature p {
    color: var(--color-gray-600);
}

.about__stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.stat__card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.stat__card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat__number {
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.stat__number::after {
    content: '+';
}

.stat__label {
    color: var(--color-gray-600);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ==================== CONTACT SECTION ==================== */
.contact {
    padding: var(--spacing-3xl) 0;
    background: var(--color-white);
}

.contact__content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.contact__form {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.form__group {
    position: relative;
}

.form__group--full {
    grid-column: 1 / -1;
}

.form__input,
.form__textarea,
.form__select {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all var(--transition-base);
    background: var(--color-white);
}

.form__input:focus,
.form__textarea:focus,
.form__select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(44, 95, 124, 0.1);
}

.form__label {
    position: absolute;
    left: 1rem;
    top: 1rem;
    color: var(--color-gray-500);
    font-size: 1rem;
    transition: all var(--transition-base);
    pointer-events: none;
    background: var(--color-white);
    padding: 0 0.25rem;
}

.form__input:focus + .form__label,
.form__input:not(:placeholder-shown) + .form__label,
.form__textarea:focus + .form__label,
.form__textarea:not(:placeholder-shown) + .form__label,
.form__select:focus + .form__label,
.form__select:valid + .form__label {
    top: -0.5rem;
    left: 0.75rem;
    font-size: 0.875rem;
    color: var(--color-primary);
}

.form__textarea {
    resize: vertical;
    min-height: 120px;
}

.contact__info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact__card {
    background: var(--color-light-blue);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
}

.contact__card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.contact__icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.contact__icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--color-white);
}

.contact__card h4 {
    font-size: 1.125rem;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.contact__card p {
    color: var(--color-gray-600);
    font-size: 0.938rem;
}

/* ==================== FOOTER ==================== */
.footer {
    background: var(--color-primary-dark);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer__content {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer__logo {
    height: 55px;
    width: auto;
    margin-bottom: var(--spacing-md);
}

.footer__description {
    color: var(--color-gray-300);
    line-height: 1.7;
}

.footer__title {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer__links a {
    color: var(--color-gray-300);
    transition: color var(--transition-fast);
}

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

.footer__bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: var(--color-gray-400);
}

/* ==================== SCROLL TO TOP BUTTON ==================== */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.scroll-top svg {
    width: 24px;
    height: 24px;
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media screen and (max-width: 1024px) {
    :root {
        --header-height: 4rem;
    }
    
    .hero__title {
        font-size: 2.5rem;
    }
    
    .section__title {
        font-size: 2rem;
    }
    
    .hero__container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .hero__img {
        height: 400px;
    }
    
    .contact__content {
        grid-template-columns: 1fr;
    }
    
    .footer__content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media screen and (max-width: 768px) {
    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: var(--color-white);
        padding: var(--spacing-2xl) var(--spacing-lg);
        box-shadow: var(--shadow-xl);
        transition: right var(--transition-slow);
    }
    
    .nav__menu.show {
        right: 0;
    }
    
    .nav__list {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .nav__close {
        display: block;
        position: absolute;
        top: 1rem;
        right: 1rem;
        font-size: 2rem;
        color: var(--color-gray-700);
        cursor: pointer;
    }
    
    .nav__toggle {
        display: flex;
        flex-direction: column;
        gap: 5px;
        cursor: pointer;
    }
    
    .nav__toggle span {
        width: 25px;
        height: 3px;
        background: var(--color-primary);
        border-radius: var(--radius-sm);
        transition: all var(--transition-base);
    }
    
    .hero__title {
        font-size: 2rem;
    }
    
    .hero__description {
        font-size: 1.125rem;
    }
    
    .hero__buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
    
    .services__grid {
        grid-template-columns: 1fr;
    }
    
    .about__stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact__form {
        grid-template-columns: 1fr;
    }
    
    .footer__content {
        grid-template-columns: 1fr;
    }
}

@media screen and (max-width: 480px) {
    .hero__title {
        font-size: 1.75rem;
    }
    
    .section__title {
        font-size: 1.75rem;
    }
    
    .stat__number {
        font-size: 2.5rem;
    }
    
    .about__stats {
        grid-template-columns: 1fr;
    }
    
    .scroll-top {
        width: 45px;
        height: 45px;
        bottom: 1.5rem;
        right: 1.5rem;
    }
}