/**
 * Essential AI Corporate Theme - Main Stylesheet
 * Clean Tech Corporate Design System
 * 
 * Color Palette:
 * - Primary Gray: #374151
 * - Secondary Blue: #2563EB
 * - Light Background: #F9FAFB
 * - Light Gray: #E5E7EB
 * - Dark Text: #111827
 * - White: #FFFFFF
 */

:root {
    /* Colors */
    --primary-color: #374151;
    --secondary-color: #2563EB;
    --accent-color: #1E40AF;
    --light-bg: #F9FAFB;
    --light-gray: #E5E7EB;
    --medium-gray: #9CA3AF;
    --dark-text: #111827;
    --white: #FFFFFF;
    
    /* Typography */
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Spacing */
    --section-padding: 80px;
    --container-width: 1200px;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--dark-text);
}

h1 { font-size: 3.5rem; }
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;
    color: var(--primary-color);
}

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

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

/* === LAYOUT === */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

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

.section-dark {
    background-color: var(--primary-color);
    color: var(--white);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4,
.section-dark h5,
.section-dark h6 {
    color: var(--white);
}

.section-dark p {
    color: var(--light-gray);
}

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

/* === HEADER === */
.site-header {
    background-color: var(--white);
    border-bottom: 1px solid var(--light-gray);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

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

.site-logo {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: -0.5px;
    transition: var(--transition);
}

.site-logo:hover {
    color: var(--secondary-color);
}

/* Navigation */
.main-navigation {
    display: flex;
    gap: 40px;
    align-items: center;
}

.main-navigation a {
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
    position: relative;
}

.main-navigation a:hover {
    color: var(--secondary-color);
}

.main-navigation a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-color);
    transition: width 0.3s ease;
}

.main-navigation a:hover::after {
    width: 100%;
}

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

/* === BUTTONS === */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}

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

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

.btn-outline-light {
    background-color: transparent;
    color: var(--white);
    border-color: var(--white);
}

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

/* === HERO SECTION === */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: var(--white);
    padding: 120px 0;
    text-align: center;
}

.hero-section h1 {
    color: var(--white);
    font-size: 4rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.hero-section .tagline {
    font-size: 1.5rem;
    color: var(--light-gray);
    margin-bottom: 2.5rem;
    font-weight: 300;
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* === SERVICE CATEGORIES === */
.services-section {
    padding: 100px 0;
    background-color: var(--light-bg);
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.75rem;
    margin-bottom: 1rem;
}

.section-title .subtitle {
    font-size: 1.25rem;
    color: var(--medium-gray);
    max-width: 700px;
    margin: 0 auto;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 50px;
}

.service-card {
    background: var(--white);
    border-radius: 8px;
    padding: 40px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    border: 1px solid var(--light-gray);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.service-card h3 {
    font-size: 1.75rem;
    margin-bottom: 15px;
    color: var(--dark-text);
}

.service-card .category-label {
    display: inline-block;
    padding: 6px 14px;
    background-color: var(--light-bg);
    color: var(--secondary-color);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.service-card p {
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 25px;
}

.service-card .btn {
    width: 100%;
}

/* === ABOUT SECTION === */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    margin-bottom: 20px;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-features {
    list-style: none;
    margin-top: 30px;
}

.about-features li {
    padding: 15px 0;
    padding-left: 35px;
    position: relative;
    font-size: 1.05rem;
}

.about-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
    font-size: 1.3rem;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.stat-box {
    background-color: var(--light-bg);
    padding: 30px;
    border-radius: 8px;
    text-align: center;
}

.stat-box .stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--secondary-color);
    font-family: var(--font-heading);
}

.stat-box .stat-label {
    font-size: 1rem;
    color: var(--primary-color);
    margin-top: 10px;
}

/* === TEAM SECTION === */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 50px;
}

.team-member {
    background: var(--white);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    border: 1px solid var(--light-gray);
}

.team-member:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.team-member-photo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    margin: 0 auto 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 700;
    color: var(--white);
    font-family: var(--font-heading);
}

.team-member h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.team-member .role {
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 15px;
}

.team-member .bio {
    color: var(--primary-color);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* === CONTACT SECTION === */
.contact-section {
    padding: 100px 0;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h3 {
    margin-bottom: 20px;
    font-size: 1.75rem;
}

.contact-info p {
    font-size: 1.1rem;
    margin-bottom: 30px;
}

.contact-details {
    margin-top: 40px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 25px;
}

.contact-item-icon {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-right: 15px;
    min-width: 30px;
}

.contact-item-text h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.contact-item-text p {
    color: var(--medium-gray);
    font-size: 0.95rem;
}

/* Contact Form */
.contact-form {
    background: var(--light-bg);
    padding: 40px;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--dark-text);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--light-gray);
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--white);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.form-message {
    padding: 12px 20px;
    border-radius: 4px;
    margin-bottom: 20px;
    display: none;
}

.form-message.success {
    background-color: #10B981;
    color: var(--white);
    display: block;
}

.form-message.error {
    background-color: #EF4444;
    color: var(--white);
    display: block;
}

/* === FOOTER === */
.site-footer {
    background-color: var(--primary-color);
    color: var(--light-gray);
    padding: 60px 0 30px;
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-about h3 {
    color: var(--white);
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.footer-about p {
    color: var(--light-gray);
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-section h4 {
    color: var(--white);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--light-gray);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
    color: var(--medium-gray);
    font-size: 0.9rem;
}

.footer-bottom a {
    color: var(--light-gray);
}

.footer-bottom a:hover {
    color: var(--white);
}

/* === PRODUCT PAGES === */
.product-hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    padding: 100px 0;
    color: var(--white);
}

.product-hero h1 {
    color: var(--white);
    font-size: 3.5rem;
    margin-bottom: 20px;
}

.product-hero .product-tagline {
    font-size: 1.5rem;
    color: var(--light-gray);
    margin-bottom: 30px;
}

.product-hero .product-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--white);
    font-weight: 600;
    font-size: 1.1rem;
}

.product-content {
    padding: 80px 0;
}

.product-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin: 50px 0;
}

.feature-box {
    padding: 30px;
    background: var(--light-bg);
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
}

.feature-box h3 {
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.feature-box p {
    font-size: 1rem;
    line-height: 1.7;
}

/* === LEGAL PAGES === */
.legal-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 80px 20px;
}

.legal-content h1 {
    margin-bottom: 10px;
}

.legal-content .last-updated {
    color: var(--medium-gray);
    font-size: 0.95rem;
    margin-bottom: 40px;
}

.legal-content h2 {
    margin-top: 40px;
    margin-bottom: 20px;
    font-size: 1.75rem;
}

.legal-content h3 {
    margin-top: 30px;
    margin-bottom: 15px;
    font-size: 1.25rem;
}

.legal-content p {
    margin-bottom: 20px;
    line-height: 1.8;
}

.legal-content ul,
.legal-content ol {
    margin-left: 30px;
    margin-bottom: 20px;
}

.legal-content li {
    margin-bottom: 10px;
    line-height: 1.7;
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 1024px) {
    .container {
        padding: 0 30px;
    }
    
    .services-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    
    .main-navigation {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-section {
        padding: 80px 0;
    }
    
    .hero-section h1 {
        font-size: 2.5rem;
    }
    
    .hero-section .tagline {
        font-size: 1.2rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
    }
    
    .product-hero h1 {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
}