/* ========================================
   BASE.CSS - Variables, Reset & Typography
   Gran Vía Verde
   ======================================== */

/* CSS Custom Properties */
:root {
    /* Colors */
    --color-green-primary: #3A7D44;
    --color-green-dark: #1E4022;
    --color-earth-accent: #C08A56;
    --color-bg: #FFFFFF;

    /* Gray Scale */
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;

    /* Spacing */
    --spacing-xs: 0.5rem;    /* 8px */
    --spacing-sm: 1rem;      /* 16px */
    --spacing-md: 1.5rem;    /* 24px */
    --spacing-lg: 2rem;      /* 32px */
    --spacing-xl: 3rem;      /* 48px */
    --spacing-2xl: 4rem;     /* 64px */
    --spacing-3xl: 6rem;     /* 96px */

    /* Border Radius */
    --radius-sm: 0.375rem;   /* 6px */
    --radius-md: 0.5rem;     /* 8px */
    --radius-lg: 1rem;       /* 16px */
    --radius-xl: 1.5rem;     /* 24px */
    --radius-2xl: 2rem;      /* 32px */

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-base: 300ms ease-out;
    --transition-slow: 500ms ease-out;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
    color: var(--color-gray-900);
    background-color: var(--color-bg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3rem;
    line-height: 1.1;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 2rem;
}

h4 {
    font-size: 1.5rem;
}

h5 {
    font-size: 1.25rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: 1rem;
    line-height: 1.75;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-base);
}

/* Layout Utilities */
.container {
    width: 100%;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
}

.section-full {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.section-padding {
    padding: var(--spacing-3xl) 0;
}

@media (max-width: 768px) {
    .section-padding {
        padding: var(--spacing-2xl) 0;
    }
}

/* Section Titles */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .section-title {
        font-size: 2rem;
    }

    .section-subtitle {
        font-size: 1.125rem;
    }
}

/* Navigation Styles */
#navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

#navbar.transparent {
    background-color: transparent;
    box-shadow: none;
}

.nav-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-gray-700);
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-green-primary);
    border-bottom-color: var(--color-green-primary);
}

.nav-link-mobile {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-gray-700);
    padding: 0.75rem 0;
    transition: all var(--transition-base);
}

.nav-link-mobile:hover {
    color: var(--color-green-primary);
    padding-left: 0.5rem;
}

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

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus Styles */
*:focus {
    outline: 2px solid var(--color-green-primary);
    outline-offset: 2px;
}

button:focus,
a:focus {
    outline-offset: 4px;
}

/* Selection */
::selection {
    background-color: var(--color-green-primary);
    color: white;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background-color: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
    background-color: var(--color-green-primary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--color-green-dark);
}