/* ========================================
   AI AGENT PORTFOLIO - HUB STYLES
   Modern professional design for project showcase
   ======================================== */

/* ===== CSS VARIABLES ===== */
:root {
    /* Colors - Light Mode */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --text-muted: #64748b;
    
    /* Brand Colors */
    --primary: #3b82f6;
    --primary-light: #60a5fa;
    --primary-dark: #2563eb;
    --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    
    /* Accent Colors */
    --accent-green: #10b981;
    --accent-purple: #8b5cf6;
    --accent-orange: #f59e0b;
    --accent-pink: #ec4899;
    --accent-cyan: #06b6d4;
    
    /* Borders */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-tertiary: #94a3b8;
        --text-muted: #64748b;
        
        --border-light: #334155;
        --border-medium: #475569;
        
        --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
        --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
        --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    }
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', 'Inter', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-primary);
    font-size: 16px;
    overflow-x: hidden;
}

/* ===== CONTAINER ===== */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 80px 24px;
}

/* ===== HEADER ===== */
header {
    margin-bottom: 64px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-light);
}

header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.04em;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

header .description {
    font-size: 1.1875rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 700px;
    margin-bottom: 24px;
}

/* ===== NAVIGATION ===== */
nav {
    display: flex;
    align-items: center;
    gap: 28px;
    flex-wrap: wrap;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 600;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
}

nav a:hover {
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* ===== STATS SECTION ===== */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 64px;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: 32px;
    text-align: center;
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== SECTION TITLES ===== */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 32px;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

/* ===== PROJECTS SECTION ===== */
.projects-section {
    margin-bottom: 80px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.project-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: 28px;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-badge {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.badge-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
    color: white;
}

.badge-success {
    background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-cyan) 100%);
    color: white;
}

.badge-purple {
    background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-pink) 100%);
    color: white;
}

.project-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    display: block;
}

.project-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 20px;
    font-size: 0.9375rem;
}

.project-links {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.project-links .cta-button {
    font-size: 0.875rem;
    padding: 10px 20px;
}

.secondary-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition-base);
    border: 1px solid var(--border-light);
}

.secondary-link:hover {
    background: var(--bg-secondary);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.project-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

.project-meta .tag {
    font-size: 0.75rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 9999px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid var(--border-light);
    transition: all var(--transition-fast);
}

.project-meta .tag:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ===== ABOUT SECTION ===== */
.about-section {
    margin-bottom: 80px;
}

.about-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-2xl);
    padding: 40px;
}

.about-content > p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: 32px;
}

.about-content strong {
    color: var(--text-primary);
    font-weight: 700;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.feature-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.65;
    margin-bottom: 0;
}

/* ===== AGENTS SECTION ===== */
.agents-section {
    margin-bottom: 80px;
}

.agents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.agent-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: 32px;
    text-align: center;
    transition: all var(--transition-base);
}

.agent-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.agent-avatar {
    font-size: 4rem;
    margin-bottom: 20px;
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.agent-card h3 {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.agent-role {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9375rem;
    margin-bottom: 16px;
}

.agent-description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.65;
    margin-bottom: 20px;
}

.agent-skills {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.skill-badge {
    font-size: 0.75rem;
    background: var(--primary-gradient);
    color: white;
    padding: 6px 14px;
    border-radius: 9999px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== TECH SECTION ===== */
.tech-section {
    margin-bottom: 80px;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.tech-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    transition: all var(--transition-base);
}

.tech-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.tech-name {
    display: block;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.tech-desc {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ===== CTA BUTTON ===== */
.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--primary-gradient);
    color: white;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    border: none;
    cursor: pointer;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    text-decoration: none;
    color: white;
}

/* ===== FOOTER ===== */
footer {
    margin-top: 80px;
    padding-top: 40px;
    padding-bottom: 48px;
    border-top: 1px solid var(--border-light);
    text-align: center;
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.footer-main {
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.footer-sub {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 20px;
}

.footer-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.footer-links span {
    color: var(--text-muted);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
    .container {
        max-width: 900px;
    }
    
    header h1 {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 48px 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    header .description {
        font-size: 1rem;
    }
    
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-title {
        font-size: 1.625rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        padding: 28px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .agents-grid {
        grid-template-columns: 1fr;
    }
    
    nav {
        justify-content: center;
    }
}

@media (max-width: 640px) {
    body {
        font-size: 15px;
    }
    
    header {
        margin-bottom: 40px;
    }
    
    header h1 {
        font-size: 1.75rem;
    }
    
    .container {
        padding: 32px 16px;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
    
    .stat-card {
        padding: 24px;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .project-card,
    .agent-card {
        padding: 24px;
    }
    
    .project-icon {
        font-size: 2.5rem;
    }
    
    .project-links {
        flex-direction: column;
    }
    
    .project-links .cta-button,
    .secondary-link {
        width: 100%;
    }
}

/* ===== UTILITY CLASSES ===== */
.text-gradient {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== SELECTION ===== */
::selection {
    background: var(--primary);
    color: white;
}

::-moz-selection {
    background: var(--primary);
    color: white;
}

/* ===== FOCUS ===== */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-card,
.agent-card,
.feature-card,
.tech-item {
    animation: fadeIn var(--transition-slow) ease-out;
}

/* ===== PRINT ===== */
@media print {
    .project-card,
    .agent-card {
        break-inside: avoid;
    }
}