/* ZBEAST EXECUTIVE SITE STYLES - V3.0 */
/* Clean, powerful, value-focused */

:root {
    --primary-black: #0A0A0A;
    --primary-white: #FFFFFF;
    --accent-blue: #0066FF;
    --success-green: #00C851;
    --text-gray: #666666;
    --light-gray: #F5F5F5;
    --border-gray: #E0E0E0;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
    --max-width: 1200px;
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Monaco, monospace;
}

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

body {
    font-family: var(--font-main);
    color: var(--primary-black);
    line-height: 1.6;
    background: var(--primary-white);
}

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

/* Header */
.header {
    background: var(--primary-white);
    border-bottom: 1px solid var(--border-gray);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
}

.logo {
    font-weight: bold;
    font-size: 1.5rem;
}

.logo-text {
    background: var(--primary-black);
    color: var(--primary-white);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--primary-black);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--accent-blue);
}

/* Hero Section */
.hero {
    padding: 8rem 0 4rem;
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background: var(--primary-white);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-gray);
    margin-bottom: 3rem;
    font-weight: 400;
}

.hero-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
    padding: 2rem;
    background: var(--light-gray);
    border-radius: 12px;
}

.metric {
    text-align: center;
}

.metric-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-blue);
    margin-bottom: 0.5rem;
}

.metric-label {
    font-size: 0.95rem;
    color: var(--text-gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

/* Buttons */
.btn {
    padding: 0.875rem 2rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: #0052CC;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

.btn-secondary:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

/* Value Section */
.value {
    padding: 5rem 0;
    background: var(--primary-white);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    font-weight: 800;
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.value-card {
    padding: 2rem;
    background: var(--light-gray);
    border-radius: 12px;
    transition: transform 0.3s;
    text-align: center;
}

.value-card:hover {
    transform: translateY(-5px);
}

.value-icon {
    font-size: 2.5rem;
    color: var(--accent-blue);
    margin-bottom: 1rem;
    display: block;
    width: 100%;
    text-align: center !important;
}

.value-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.value-card p {
    color: var(--text-gray);
    line-height: 1.8;
}

/* Tech Stack */
.tech-stack {
    text-align: center;
    margin-top: 3rem;
    padding: 2rem;
    background: var(--light-gray);
    border-radius: 12px;
}

.tech-stack h3 {
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.tech-tag {
    padding: 0.5rem 1rem;
    background: var(--primary-white);
    border: 1px solid var(--border-gray);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Philosophy Section */
.philosophy {
    padding: 5rem 0;
    background: var(--light-gray);
}

.philosophy-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.philosophy-quote {
    margin-bottom: 2rem;
}

.philosophy-quote p {
    font-size: 1.3rem;
    line-height: 1.8;
    color: var(--primary-black);
    font-style: italic;
    font-weight: 500;
}

.philosophy-statement {
    margin-bottom: 3rem;
    padding: 1.5rem;
    background: var(--primary-white);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.philosophy-statement p {
    font-size: 1.1rem;
    color: var(--primary-black);
    margin: 0;
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.philosophy-card {
    background: var(--primary-white);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
    text-align: center;
}

.philosophy-card:hover {
    transform: translateY(-5px);
}

.philosophy-icon {
    font-size: 2rem;
    color: var(--accent-blue);
    margin-bottom: 1rem;
}

.philosophy-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--primary-black);
    font-weight: 700;
}

.philosophy-card p {
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

/* Articles Section */
.articles {
    padding: 5rem 0;
    background: var(--primary-white);
}

.section-subtitle {
    text-align: center;
    color: var(--text-gray);
    font-size: 1.25rem;
    margin-bottom: 3rem;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.article-card {
    background: var(--primary-white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.article-card:hover {
    transform: translateY(-5px);
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.article-meta time {
    color: var(--text-gray);
    font-size: 0.9rem;
}

.article-category {
    background: var(--accent-blue);
    color: var(--primary-white);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-black);
}

.article-card p {
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.read-more {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.read-more:hover {
    color: #0052CC;
}

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

/* Books Section */
.books {
    padding: 5rem 0;
    background: var(--primary-white);
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.book-category {
    background: var(--light-gray);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.book-category .category-title {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--primary-black);
    text-align: center;
    display: block;
    width: 100%;
}

.book-category .category-title i {
    color: var(--accent-blue);
    font-size: 2.5rem;
    display: block;
    margin-bottom: 1rem;
}

.book-card {
    background: var(--primary-white);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-blue);
    transition: transform 0.3s;
    text-align: center;
}

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

.book-card:last-child {
    margin-bottom: 0;
}

.book-cover {
    width: 60px;
    margin: 1rem auto;
    text-align: center;
}

.book-cover img {
    width: 60px;
    height: 80px;
    object-fit: cover;
    border-radius: 3px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
    display: block;
    margin: 0 auto;
}

.book-card h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--primary-black);
    line-height: 1.3;
}

.book-cover {
    margin-bottom: 1rem;
}

.book-author {
    font-size: 0.85rem;
    color: var(--accent-blue);
    font-weight: 600;
    margin: 0;
}

/* Open Source Section */
.open-source {
    padding: 5rem 0;
    background: var(--light-gray);
}

.oss-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.oss-card {
    padding: 2rem;
    background: var(--light-gray);
    border-radius: 12px;
    transition: transform 0.3s;
}

.oss-card:hover {
    transform: translateY(-5px);
}

.oss-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.oss-header h3 {
    font-size: 1.5rem;
}

.oss-links {
    display: flex;
    gap: 1rem;
}

.oss-links a {
    color: var(--text-gray);
    font-size: 1.25rem;
    transition: color 0.3s;
}

.oss-links a:hover {
    color: var(--accent-blue);
}

.oss-card p {
    color: var(--text-gray);
    margin-bottom: 1rem;
}

.oss-stats {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-gray);
}

.oss-stats i {
    color: var(--accent-blue);
    margin-right: 0.25rem;
}

/* Connect Section */
.connect {
    padding: 5rem 0;
    background: var(--primary-black);
    text-align: center;
    color: var(--primary-white);
}

.connect .section-title {
    color: var(--primary-white);
}

.connect-subtitle {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.25rem;
    margin-bottom: 3rem;
}

.connect-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.connect-card {
    padding: 2rem;
    background: var(--primary-white);
    border-radius: 12px;
    text-decoration: none;
    color: var(--primary-black);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    transition: all 0.3s;
    box-shadow: var(--shadow);
}

.connect-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    color: var(--primary-white);
    background: var(--accent-blue);
}

.connect-card i {
    font-size: 2rem;
    color: var(--accent-blue);
}

.connect-card:hover i {
    color: var(--primary-white);
}

/* Footer */
.footer {
    padding: 2rem 0;
    background: var(--primary-black);
    color: var(--primary-white);
    text-align: center;
}

.footer p {
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-metrics {
        grid-template-columns: 1fr;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .books-grid {
        grid-template-columns: 1fr;
    }
    
    .book-cover {
        width: 50px;
        margin: 0.75rem auto;
        text-align: center;
    }
    
    .book-cover img {
        width: 50px;
        height: 65px;
        display: block;
        margin: 0 auto;
    }
    
    .book-card {
        text-align: center !important;
    }
    
    .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .value-grid {
        grid-template-columns: 1fr;
    }
}