/* ==========================================================================
   VARIABLES Y TOKENS (Design System)
   ========================================================================== */
:root {
    /* Colors */
    --color-primary: #2E7D32;       /* Verde ambiental */
    --color-primary-dark: #1b4e1e;
    --color-secondary: #1976D2;     /* Azul corporativo */
    --color-secondary-dark: #0e4c8c;
    --color-success: #4CAF50;
    --color-warning: #FF9800;
    
    --color-bg-light: #FFFFFF;
    --color-bg-alt: #F5F7FA;
    
    --color-text-body: #333333;
    --color-text-title: #1A1A1A;
    --color-text-inverse: #FFFFFF;

    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Open Sans', sans-serif;
    
    /* Spacing & Layout */
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 48px;
    --space-xl: 80px;
    --container-max-width: 1200px;
    
    /* Border & Shadow */
    --border-radius: 12px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --box-shadow-hover: 0 12px 24px rgba(0, 0, 0, 0.12);
    
    /* Transitions */
    --transition-fast: 0.2s ease-in-out;
    --transition-base: 0.3s ease-in-out;
}

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

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

body {
    font-family: var(--font-body);
    color: var(--color-text-body);
    background-color: var(--color-bg-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-text-title);
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

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

a:hover {
    color: var(--color-secondary-dark);
}

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

ul {
    list-style: none;
}

/* ==========================================================================
   LAYOUT & GRID (Mobile First)
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

.section {
    padding: var(--space-lg) 0;
}

.section__header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.section__title {
    font-size: 2rem;
    font-weight: 700;
}

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

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

.text-center {
    text-align: center;
}

/* CSS Grid */
.grid {
    display: grid;
    gap: var(--space-sm);
}

/* ==========================================================================
   COMPONENTS
   ========================================================================== */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-align: center;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
    min-height: 44px; /* A11y touch target */
}

.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn--primary:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-text-inverse);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(46, 125, 50, 0.3);
}

.btn--secondary {
    background-color: var(--color-secondary);
    color: var(--color-text-inverse);
}

.btn--secondary:hover {
    background-color: var(--color-secondary-dark);
    color: var(--color-text-inverse);
    transform: translateY(-2px);
}

.btn--outline {
    background-color: transparent;
    border-color: var(--color-text-inverse);
    color: var(--color-text-inverse);
}

.btn--outline:hover {
    background-color: var(--color-text-inverse);
    color: var(--color-text-title);
}

.btn--large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn--small {
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    min-height: 36px;
}

/* Link with Arrow */
.link-arrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}
.link-arrow svg {
    transition: transform var(--transition-fast);
}
.link-arrow:hover svg {
    transform: translateX(4px);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 50px;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}
.badge--success { background-color: rgba(76, 175, 80, 0.1); color: var(--color-success); }
.badge--primary { background-color: rgba(46, 125, 50, 0.1); color: var(--color-primary); }

/* Breadcrumbs */
.breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--space-md);
    font-size: 0.875rem;
    align-items: center;
}
.breadcrumbs span {
    font-weight: 600;
    color: var(--color-text-title);
}
.breadcrumbs a {
    color: var(--color-text-body);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    background-color: #e2e8f0;
}
.breadcrumbs a.active, .breadcrumbs a:hover {
    background-color: var(--color-primary);
    color: white;
}

/* Cards */
.card {
    background-color: var(--color-bg-light);
    border-radius: var(--border-radius);
    padding: var(--space-md);
    box-shadow: var(--box-shadow);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.card--icon .card__icon-wrapper {
    width: 64px;
    height: 64px;
    background-color: rgba(46, 125, 50, 0.1);
    color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-sm);
}

.card__title {
    font-size: 1.25rem;
}

/* Course Card */
.card--course {
    padding: 0;
    overflow: hidden;
}

.card--course .card__image {
    width: 100%;
    height: 200px;
    background-color: #e2e8f0;
    overflow: hidden;
}

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

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

.card--course .card__content {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    flex: 1;
}

.card--course .card__text {
    margin-bottom: 1rem;
    flex: 1;
}

/* ==========================================================================
   SECTIONS
   ========================================================================== */

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    z-index: 1000;
    transition: all var(--transition-fast);
}

.header__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.header__logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header__logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.header__logo-text {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--color-text-title);
    letter-spacing: -0.5px;
}

.header__logo-accent {
    color: var(--color-primary);
}

.header__search {
    display: none; /* Hidden on mobile */
    position: relative;
    margin: 0 var(--space-md);
    flex: 1;
    max-width: 300px;
}

.header__search input {
    width: 100%;
    padding: 0.5rem 1rem 0.5rem 2.5rem;
    border: 1px solid #cbd5e1;
    border-radius: 50px;
    font-family: var(--font-body);
}

.header__search button {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #64748b;
    cursor: pointer;
}

.header__toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-title);
    position: relative;
    transition: background-color 0.2s;
}

.hamburger::before, .hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-title);
    transition: transform 0.2s;
    left: 0;
}

.hamburger::before { top: -6px; }
.hamburger::after { bottom: -6px; }

.header__toggle[aria-expanded="true"] .hamburger {
    background-color: transparent;
}
.header__toggle[aria-expanded="true"] .hamburger::before {
    transform: translateY(6px) rotate(45deg);
}
.header__toggle[aria-expanded="true"] .hamburger::after {
    transform: translateY(-6px) rotate(-45deg);
}

.nav {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: var(--color-bg-light);
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
    transition: left var(--transition-base);
    overflow-y: auto;
}

.nav.is-open {
    left: 0;
}

.nav__list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.nav__link {
    font-family: var(--font-heading);
    font-weight: 400;
    font-size: 1rem;
    color: var(--color-text-title);
}

.nav__actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: auto;
}

/* Hero Section */
.hero {
    position: relative;
    padding-top: 100px; /* offset header */
    min-height: 80vh;
    display: flex;
    align-items: center;
    color: var(--color-text-inverse);
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero__bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4); /* 40% dark overlay */
}

.hero__content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

.hero__title {
    color: var(--color-text-inverse);
    font-size: 1.8rem;
    margin-bottom: var(--space-md);
}

.hero__subtitle {
    font-size: 1.125rem;
    margin-bottom: var(--space-lg);
    opacity: 0.9;
}

.hero__cta-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Impact Section */
.impact__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

.impact__stat {
    text-align: center;
    padding: var(--space-md);
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius);
}

.impact__icon {
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.impact__number {
    display: block;
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text-title);
    margin-bottom: 0.25rem;
}

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

/* Testimonials */
.testimonial-card {
    background-color: white;
    padding: var(--space-lg) var(--space-md);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.testimonial__quote {
    font-style: italic;
    font-size: 1.125rem;
    border-left: 4px solid var(--color-primary);
    padding-left: 1rem;
    margin-bottom: 1.5rem;
}

.testimonial__author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.testimonial__avatar {
    width: 48px;
    height: 48px;
    background-color: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.testimonial__info strong {
    display: block;
    color: var(--color-text-title);
}

.testimonial__info span {
    font-size: 0.875rem;
    color: var(--color-text-body);
}

/* Footer */
.footer {
    background-color: #1e293b;
    color: #f8fafc;
    padding-top: var(--space-xl);
}

.footer__container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.footer__brand h3 {
    color: white;
    margin-bottom: 1rem;
}

.footer__brand p {
    color: #cbd5e1;
    margin-bottom: 1.5rem;
}

.footer__social {
    display: flex;
    gap: 1rem;
}

.footer__social a {
    color: #cbd5e1;
}

.footer__social a:hover {
    color: white;
}

.footer__links h4 {
    color: white;
    margin-bottom: 1rem;
}

.footer__links ul li {
    margin-bottom: 0.5rem;
}

.footer__links ul a {
    color: #cbd5e1;
}

.footer__links ul a:hover {
    color: white;
}

.footer__bottom {
    border-top: 1px solid #334155;
    padding: 1.5rem 0;
    text-align: center;
    color: #94a3b8;
    font-size: 0.875rem;
}

/* ==========================================================================
   MEDIA QUERIES (Desktop & Tablets)
   ========================================================================== */

/* Tablet (768px+) */
@media (min-width: 768px) {
    .section { padding: var(--space-xl) 0; }
    
    .grid--2, .grid--3 {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }
    
    .hero__title { font-size: 2.5rem; }
    .hero__cta-group { 
        flex-direction: row; 
        justify-content: center;
    }
    
    .impact__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer__container {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .header__container { height: 80px; }
    .header__toggle { display: none; }
    .header__search { display: block; }
    
    .nav {
        position: static;
        width: auto;
        height: auto;
        flex-direction: row;
        align-items: center;
        background: none;
        padding: 0;
        flex: 1;
        justify-content: space-between;
        overflow-y: visible;
    }
    
    .nav__list {
        flex-direction: row;
        margin-bottom: 0;
        gap: 2rem;
        margin-left: 2rem;
    }
    
    .nav__link {
        font-size: 0.875rem;
    }
    
    .nav__link:hover {
        color: var(--color-primary);
    }
    
    .nav__actions {
        flex-direction: row;
        margin-top: 0;
    }

    .grid--3 {
        grid-template-columns: repeat(3, 1fr);
    }

    .impact__grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .footer__container {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
    
    .hero__content {
        text-align: left;
    }
    .hero__cta-group {
        justify-content: flex-start;
    }
}