/*
Theme Name: Renato Reis Executive Portfolio
Description: A professional single-page WordPress theme showcasing Renato Reis as a distinguished Head of Engineering/CTO/Software Architect with expertise in Front-end development, AI Consulting, Design Thinking, UI/UX, and Solution Architecture. Features 4-language support (pt-br, pt-pt, en-us, en-uk) and modern responsive design.
Version: 1.0.0
Author: Renato Reis
Text Domain: renato-reis-portfolio
Domain Path: /languages
Requires at least: 6.0
Tested up to: 6.4
Requires PHP: 8.0
License: GPL v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
*/

/* ==========================================================================
   CSS RESET & BASE STYLES
   ========================================================================== */

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

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

body {
    font-family: 'Inter', 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #2C3E50;
    background-color: #FFFFFF;
    overflow-x: hidden;
}

/* ==========================================================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ========================================================================== */

:root {
    /* Colors */
    --primary-orange: #FF6B35;
    --professional-grey: #2C3E50;
    --light-grey: #ECF0F1;
    --dark-grey: #34495E;
    --accent-orange: #E74C3C;
    --white: #FFFFFF;
    
    /* Typography */
    --font-primary: 'Inter', 'Poppins', sans-serif;
    --font-secondary: 'Source Sans Pro', 'Open Sans', sans-serif;
    
    /* Font Sizes */
    --font-size-h1: 3.5rem;
    --font-size-h2: 2.5rem;
    --font-size-h3: 1.75rem;
    --font-size-body: 1.125rem;
    --font-size-small: 0.875rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Layout */
    --max-width: 1200px;
    --header-height: 80px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-light: 0 2px 10px rgba(44, 62, 80, 0.1);
    --shadow-medium: 0 4px 20px rgba(44, 62, 80, 0.15);
    --shadow-heavy: 0 8px 30px rgba(44, 62, 80, 0.2);
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--professional-grey);
}

h1 {
    font-size: var(--font-size-h1);
}

h2 {
    font-size: var(--font-size-h2);
}

h3 {
    font-size: var(--font-size-h3);
}

p {
    font-size: var(--font-size-body);
    margin-bottom: var(--spacing-sm);
    color: var(--dark-grey);
}

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

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

/* ==========================================================================
   LAYOUT & GRID
   ========================================================================== */

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

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

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

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

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--light-grey);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.site-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--professional-grey);
}

.main-navigation ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.main-navigation a {
    color: var(--professional-grey);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.main-navigation a:hover,
.main-navigation a.active {
    background-color: var(--primary-orange);
    color: var(--white);
}

/* Language Switcher */
.language-switcher {
    display: flex;
    gap: var(--spacing-xs);
}

.language-switcher button {
    background: none;
    border: 1px solid var(--light-grey);
    padding: var(--spacing-xs);
    border-radius: 4px;
    cursor: pointer;
    font-size: var(--font-size-small);
    transition: all var(--transition-fast);
}

.language-switcher button:hover,
.language-switcher button.active {
    background-color: var(--primary-orange);
    color: var(--white);
    border-color: var(--primary-orange);
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--professional-grey);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */

.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--white) 0%, var(--light-grey) 100%);
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-text h1 {
    font-size: clamp(2.5rem, 5vw, var(--font-size-h1));
    margin-bottom: var(--spacing-md);
}

.hero-text .subtitle {
    font-size: 1.25rem;
    color: var(--primary-orange);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.hero-text .description {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
    max-width: 500px;
}

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

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 50%;
    box-shadow: var(--shadow-heavy);
    max-width: 400px;
}

/* ==========================================================================
   BUTTONS & CTAs
   ========================================================================== */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all var(--transition-normal);
    text-decoration: none;
    font-size: var(--font-size-body);
}

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

.btn-primary:hover {
    background-color: var(--accent-orange);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background-color: transparent;
    color: var(--professional-grey);
    border: 2px solid var(--professional-grey);
}

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

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* ==========================================================================
   CARDS & CONTENT BLOCKS
   ========================================================================== */

.card {
    background: var(--white);
    border-radius: 8px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-light);
    transition: all var(--transition-normal);
}

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

.card-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary-orange);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
    color: var(--white);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* ==========================================================================
   SECTION HEADERS
   ========================================================================== */

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

.section-header h2 {
    margin-bottom: var(--spacing-sm);
}

.section-header .subtitle {
    color: var(--primary-orange);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.section-header .description {
    max-width: 600px;
    margin: 0 auto;
    color: var(--dark-grey);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.site-footer {
    background-color: var(--professional-grey);
    color: var(--white);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--light-grey);
}

.footer-section a:hover {
    color: var(--primary-orange);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.social-links a {
    display: inline-block;
    width: 40px;
    height: 40px;
    background-color: var(--primary-orange);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background-color: var(--accent-orange);
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid var(--dark-grey);
    padding-top: var(--spacing-md);
    color: var(--light-grey);
    font-size: var(--font-size-small);
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 768px) {
    :root {
        --font-size-h1: 2.5rem;
        --font-size-h2: 2rem;
        --font-size-h3: 1.5rem;
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .main-navigation {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .cta-buttons {
        justify-content: center;
    }
    
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .expertise-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-section {
        min-height: 90vh;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
}

/* ==========================================================================
   ANIMATIONS & TRANSITIONS
   ========================================================================== */

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Scroll Progress Indicator */
.scroll-progress {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-orange), var(--accent-orange));
    z-index: 1001;
    transition: width 0.1s ease;
}

/* ==========================================================================
   UTILITY CLASSES
   ========================================================================== */

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

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.hidden { display: none; }
.visible { display: block; }

/* Language-specific content visibility */
.lang-content {
    display: none;
}

.lang-content.active {
    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: 0;
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--primary-orange);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-orange: #FF4500;
        --professional-grey: #000000;
        --light-grey: #F0F0F0;
        --dark-grey: #333333;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}