/* ===== CSS Variables ===== */
:root,
[data-theme="default"] {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --glow-color: rgba(99, 102, 241, 0.4);
    --border-color: rgba(255, 255, 255, 0.08);
    --card-bg: rgba(26, 26, 37, 0.6);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;
    --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ===== Matrix Theme ===== */
[data-theme="matrix"] {
    --bg-primary: #000000;
    --bg-secondary: #0a0f0a;
    --bg-tertiary: #0f1a0f;
    --text-primary: #00ff00;
    --text-secondary: #00cc00;
    --text-muted: #008800;
    --accent-primary: #00ff00;
    --accent-secondary: #00dd00;
    --accent-gradient: linear-gradient(135deg, #00ff00 0%, #00cc00 50%, #00aa00 100%);
    --glow-color: rgba(0, 255, 0, 0.4);
    --border-color: rgba(0, 255, 0, 0.15);
    --card-bg: rgba(0, 20, 0, 0.7);
}

/* ===== Gruvbox Theme ===== */
[data-theme="gruvbox"] {
    --bg-primary: #1d2021;
    --bg-secondary: #282828;
    --bg-tertiary: #3c3836;
    --text-primary: #ebdbb2;
    --text-secondary: #d5c4a1;
    --text-muted: #a89984;
    --accent-primary: #fe8019;
    --accent-secondary: #fabd2f;
    --accent-gradient: linear-gradient(135deg, #fe8019 0%, #fabd2f 50%, #b8bb26 100%);
    --glow-color: rgba(254, 128, 25, 0.4);
    --border-color: rgba(235, 219, 178, 0.1);
    --card-bg: rgba(60, 56, 54, 0.6);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    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: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

/* ===== Cursor Glow Effect ===== */
.cursor-glow {
    position: fixed;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--glow-color) 0%, transparent 70%);
    pointer-events: none;
    transform: translate(-50%, -50%);
    z-index: 0;
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.5rem 2rem;
    transition: var(--transition-medium);
}

.nav.scrolled {
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: var(--transition-fast);
}

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

.nav-links a:hover::after {
    width: 100%;
}

/* Theme Switcher */
.theme-switcher {
    position: relative;
    margin-left: auto;
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

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

.theme-icon {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.theme-toggle:hover .theme-icon {
    color: var(--accent-primary);
}

.theme-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.5rem;
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-fast);
    z-index: 200;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.theme-dropdown.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.theme-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: var(--transition-fast);
}

.theme-option:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.theme-option.active {
    background: var(--accent-primary);
    color: white;
}

.theme-preview {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.theme-preview.default {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
}

.theme-preview.matrix {
    background: linear-gradient(135deg, #00ff00 0%, #008800 100%);
}

.theme-preview.gruvbox {
    background: linear-gradient(135deg, #fe8019 0%, #fabd2f 100%);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 2rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--accent-primary);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--accent-secondary);
    bottom: -100px;
    left: -100px;
    animation-delay: -5s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: #a855f7;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(-30px, -20px) scale(1.02); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

/* Terminal */
.hero-terminal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0;
    margin-bottom: 3rem;
    display: inline-block;
    text-align: left;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.terminal-header {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.terminal-dot.red { background: #ff5f57; }
.terminal-dot.yellow { background: #febc2e; }
.terminal-dot.green { background: #28c840; }

.terminal-body {
    padding: 1rem 1.5rem;
    font-family: var(--font-mono);
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 400px;
}

.terminal-prompt {
    color: var(--accent-primary);
}

.terminal-text {
    color: var(--text-primary);
}

.terminal-cursor {
    color: var(--accent-primary);
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

.hero-title {
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1rem;
}

.hero-line {
    display: block;
    background: linear-gradient(135deg, #fff 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
    font-family: var(--font-mono);
}

.hero-tagline {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-large {
    padding: 1.125rem 3rem;
    font-size: 1rem;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-arrow {
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    width: 4px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 2px;
    transform: translateX(-50%);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(12px); opacity: 0.3; }
}

/* ===== Sections ===== */
.section {
    padding: 8rem 2rem;
    position: relative;
}

.section-content {
    max-width: 1000px;
    margin: 0 auto;
}

.section-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.title-accent {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--accent-primary);
}

/* ===== About Section ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.0625rem;
}

.about-lead {
    font-size: 1.25rem !important;
    color: var(--text-primary) !important;
    font-weight: 500;
}

.highlight {
    color: var(--accent-primary);
    font-weight: 500;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.stat-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition-medium);
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ===== Experience Section ===== */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary), transparent);
}

.timeline-item {
    position: relative;
    padding-bottom: 3rem;
}

.timeline-marker {
    position: absolute;
    left: -2rem;
    top: 0.5rem;
    width: 12px;
    height: 12px;
    background: var(--accent-primary);
    border-radius: 50%;
    transform: translateX(-50%);
    box-shadow: 0 0 20px var(--glow-color);
}

.timeline-content {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-left: 1rem;
    transition: var(--transition-medium);
}

.timeline-content:hover {
    border-color: var(--accent-primary);
}

.timeline-header {
    margin-bottom: 0.5rem;
}

.timeline-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.timeline-company {
    color: var(--accent-primary);
    font-weight: 500;
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.timeline-details {
    margin: 1rem 0;
    padding-left: 1.25rem;
}

.timeline-details li {
    position: relative;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
}

.timeline-details li::before {
    content: '▹';
    position: absolute;
    left: -1.25rem;
    color: var(--accent-primary);
}

.timeline-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.timeline-tech span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
    border-radius: 4px;
}

/* ===== Skills Section ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: var(--transition-medium);
}

.skill-category:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
}

.skill-category-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.skill-icon {
    font-size: 1.5rem;
}

.skill-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-item {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    padding: 0.375rem 0.875rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.skill-item:hover {
    background: var(--accent-primary);
    color: white;
}

/* ===== Contact Section ===== */
.contact {
    text-align: center;
}

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

.contact-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9375rem;
    transition: var(--transition-fast);
}

.contact-link svg {
    width: 20px;
    height: 20px;
}

.contact-link:hover {
    color: var(--accent-primary);
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
}

.footer-note {
    margin-top: 0.5rem;
    opacity: 0.6;
}

/* ===== Animations ===== */
.reveal-up,
.reveal-left {
    opacity: 0;
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    transition-delay: var(--delay, 0s);
}

.reveal-up {
    transform: translateY(40px);
}

.reveal-left {
    transform: translateX(-40px);
}

.reveal-up.revealed,
.reveal-left.revealed {
    opacity: 1;
    transform: translate(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .theme-switcher {
        margin-left: 0;
    }
    
    .hero-title {
        font-size: clamp(2.5rem, 12vw, 4rem);
    }
    
    .terminal-body {
        min-width: auto;
        font-size: 0.875rem;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section {
        padding: 4rem 1.5rem;
    }
    
    .timeline {
        padding-left: 1.5rem;
    }
    
    .timeline-content {
        padding: 1.5rem;
        margin-left: 0.5rem;
    }
    
    .contact-links {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .stat-number {
        font-size: 2rem;
    }
}