/* ========================================
   AI Consulting Site — Ryan Sylvestri
   Dark theme, tech-forward, professional
   ======================================== */

:root {
    /* Colors - Dark theme with premium accents */
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-card: #151515;
    --bg-hover: #1f1f1f;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-tertiary: #707070;
    
    --accent-primary: #00d9ff;
    --accent-secondary: #0099ff;
    --accent-gradient: linear-gradient(135deg, #00d9ff 0%, #0099ff 100%);
    
    --tier-1: #4ade80;
    --tier-2: #fbbf24;
    --tier-3: #f87171;
    --tier-4: #a78bfa;
    
    --border-subtle: #252525;
    --border-medium: #333333;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    /* Spacing */
    --container-width: 1200px;
    --section-padding: 120px;
    --section-padding-mobile: 60px;
    
    /* Effects */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(0, 217, 255, 0.15);
}

/* ========================================
   Reset & Base Styles
   ======================================== */

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

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

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

@media (max-width: 768px) {
    section {
        padding: var(--section-padding-mobile) 0;
    }
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-title {
    font-size: 2.75rem;
    margin-bottom: 16px;
}

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

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

@media (max-width: 768px) {
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1.1rem;
    }
    
    .section-header {
        margin-bottom: 48px;
    }
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   Buttons
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: var(--font-sans);
}

.btn-primary {
    background: var(--accent-gradient);
    color: var(--bg-primary);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 50px rgba(0, 217, 255, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-medium);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-medium);
    font-size: 0.95rem;
    padding: 12px 24px;
}

.btn-outline:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-large {
    padding: 18px 36px;
    font-size: 1.1rem;
}

.btn-icon {
    width: 16px;
    height: 16px;
    transition: var(--transition);
}

.btn-icon-left {
    width: 20px;
    height: 20px;
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

/* ========================================
   Navigation
   ======================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    transition: var(--transition);
}

.nav.scrolled {
    background: rgba(10, 10, 10, 0.95);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.nav-logo:hover {
    color: var(--accent-primary);
}

.nav-menu {
    display: flex;
    gap: 32px;
    list-style: none;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.95rem;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-cta {
    padding: 8px 20px;
    background: var(--accent-gradient);
    color: var(--bg-primary);
    border-radius: 6px;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 10, 10, 0.98);
        padding: 24px;
        gap: 16px;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
        border-bottom: 1px solid var(--border-subtle);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .nav-toggle {
        display: flex;
    }
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 72px;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: 24px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--accent-primary);
    margin-bottom: 24px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 48px;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 80px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
    margin-top: 80px;
    padding-top: 48px;
    border-top: 1px solid var(--border-subtle);
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    opacity: 0.4;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 217, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 153, 255, 0.1) 0%, transparent 50%);
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        justify-content: center;
    }
}

/* ========================================
   Services Section
   ======================================== */

.services {
    background: var(--bg-secondary);
}

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

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 32px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-medium);
    box-shadow: var(--shadow-lg);
}

.service-card:hover::before {
    opacity: 1;
}

.service-card.featured {
    border-color: var(--accent-primary);
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.05) 0%, rgba(0, 153, 255, 0.02) 100%);
}

.service-card.featured::before {
    opacity: 1;
}

.service-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    background: var(--accent-gradient);
    color: var(--bg-primary);
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.service-title {
    font-size: 1.75rem;
    margin-bottom: 8px;
}

.service-level {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-weight: 500;
}

.service-description {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.7;
}

.service-features {
    list-style: none;
    margin-bottom: 24px;
}

.service-features li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.service-features li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

.service-format {
    padding: 16px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    border: 1px solid var(--border-subtle);
}

.service-format strong {
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .services-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   About Section
   ======================================== */

.about {
    background: var(--bg-primary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 64px;
    align-items: start;
}

.about-text {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-text strong {
    color: var(--text-primary);
    font-weight: 600;
}

.about-principles {
    margin-top: 48px;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
}

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

.about-principles ul {
    list-style: none;
}

.about-principles li {
    padding: 12px 0;
    padding-left: 28px;
    position: relative;
    color: var(--text-secondary);
}

.about-principles li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
}

.about-principles strong {
    color: var(--text-primary);
}

.about-content .btn {
    margin-top: 32px;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.highlight-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 28px;
}

.highlight-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.highlight-card h4 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    color: var(--accent-primary);
}

.highlight-card ul {
    list-style: none;
}

.highlight-card li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.highlight-card li::before {
    content: '•';
    position: absolute;
    left: 8px;
    color: var(--accent-primary);
}

@media (max-width: 968px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

/* ========================================
   Contact Section
   ======================================== */

.contact {
    background: var(--bg-secondary);
    text-align: center;
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
}

.contact-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.contact-cta {
    margin-bottom: 24px;
}

.contact-note {
    color: var(--text-tertiary);
    font-size: 0.95rem;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-subtle);
    padding: 48px 0 24px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.footer-logo {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border-subtle);
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        gap: 32px;
        text-align: center;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 16px;
    }
}

/* ========================================
   Animations
   ======================================== */

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

.hero-content > * {
    animation: fadeInUp 0.8s ease-out backwards;
}

.hero-badge { animation-delay: 0.1s; }
.hero-title { animation-delay: 0.2s; }
.hero-subtitle { animation-delay: 0.3s; }
.hero-cta { animation-delay: 0.4s; }
.hero-stats { animation-delay: 0.5s; }

/* ========================================
   Utilities
   ======================================== */

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

.mt-32 {
    margin-top: 32px;
}

.mb-32 {
    margin-bottom: 32px;
}