/* ================================
   CSS Variables & Theme Colors
   ================================ */

:root {
    /* Light Theme Colors */
    --primary: #0ea5e9;
    --primary-dark: #0284c7;
    --secondary: #06b6d4;
    --accent: #14b8a6;

    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-code: #1e293b;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-inverse: #ffffff;

    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);

    --gradient-primary: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
    --gradient-secondary: linear-gradient(135deg, #14b8a6 0%, #0ea5e9 100%);

    /* Terminal Colors */
    --terminal-bg: #1e293b;
    --terminal-text: #e2e8f0;
    --terminal-prompt: #06b6d4;
    --terminal-command: #10b981;
    --terminal-output: #94a3b8;
    --terminal-success: #22c55e;
    --terminal-warning: #f59e0b;
    --terminal-info: #3b82f6;
}

[data-theme="dark"] {
    /* Dark Theme Colors */
    --primary: #38bdf8;
    --primary-dark: #0ea5e9;
    --secondary: #22d3ee;
    --accent: #2dd4bf;

    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-code: #0d1117;

    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --text-inverse: #0f172a;

    --border-color: #334155;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.5);

    --terminal-bg: #0d1117;
    --terminal-text: #e2e8f0;
}

/* ================================
   Base Styles
   ================================ */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

code, pre {
    font-family: 'Fira Code', 'Courier New', monospace;
}

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

img {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 100px 0;
}

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

.section-tag {
    font-family: 'Fira Code', monospace;
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 500;
    display: block;
    margin-bottom: 10px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
}

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

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.nav.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.nav-brand {
    font-family: 'Fira Code', monospace;
    font-size: 1.5rem;
    font-weight: 700;
}

.brand-bracket {
    color: var(--primary);
}

.brand-name {
    color: var(--text-primary);
    padding: 0 5px;
}

.nav-links {
    display: flex;
    gap: 40px;
    list-style: none;
}

.nav-link {
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: color 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

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

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 120px 20px 80px;
    background: var(--bg-primary);
}

.hero-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.hero-greeting {
    font-family: 'Fira Code', monospace;
    font-size: 1rem;
    color: var(--primary);
    display: block;
    margin-bottom: 15px;
}

.hero-name {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.hero-name .highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 25px;
}

.hero-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 35px;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 30px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.hero-social {
    display: flex;
    gap: 15px;
}

.social-icon {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 1.25rem;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.social-icon:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* Terminal Component */
.terminal {
    background: var(--terminal-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.terminal-header {
    background: rgba(0, 0, 0, 0.3);
    padding: 12px 15px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.terminal-buttons {
    display: flex;
    gap: 8px;
}

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

.btn-red {
    background: #ff5f56;
}

.btn-yellow {
    background: #ffbd2e;
}

.btn-green {
    background: #27c93f;
}

.terminal-title {
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    color: var(--terminal-text);
}

.terminal-body {
    padding: 20px;
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    line-height: 1.8;
}

.terminal-line {
    margin-bottom: 8px;
    color: var(--terminal-text);
}

.terminal-line.output {
    padding-left: 20px;
}

.prompt {
    color: var(--terminal-prompt);
    margin-right: 8px;
    font-weight: 600;
}

.command {
    color: var(--terminal-command);
}

.cursor {
    color: var(--terminal-text);
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

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

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

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

.scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-tertiary);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

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

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

.about-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-lead {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-content p {
    margin-bottom: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-highlight {
    background: var(--bg-tertiary);
    border-left: 4px solid var(--primary);
    padding: 20px 25px;
    margin-top: 30px;
    border-radius: 8px;
    position: relative;
}

.about-highlight i {
    color: var(--primary);
    font-size: 1.5rem;
    margin-bottom: 10px;
    display: block;
}

.about-highlight p {
    font-style: italic;
    color: var(--text-primary);
    margin: 0;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.stat-card {
    background: var(--bg-primary);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.stat-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    border-radius: 10px;
    font-size: 1.5rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* ================================
   Expertise Section
   ================================ */

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.expertise-card {
    background: var(--bg-secondary);
    padding: 35px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.expertise-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.card-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    border-radius: 14px;
    font-size: 1.75rem;
    margin-bottom: 20px;
}

.expertise-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.expertise-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.card-features {
    list-style: none;
}

.card-features li {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-features i {
    color: var(--primary);
    font-size: 0.875rem;
}

/* ================================
   Skills Section
   ================================ */

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

.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.skill-category {
    background: var(--bg-primary);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.skill-category:hover {
    box-shadow: var(--shadow-md);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.category-header i {
    font-size: 1.5rem;
    color: var(--primary);
}

.category-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.skill-tag:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* ================================
   Experience Section
   ================================ */

.timeline {
    position: relative;
    padding-left: 50px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
}

.timeline-dot {
    position: absolute;
    left: -42px;
    top: 5px;
    width: 16px;
    height: 16px;
    background: var(--primary);
    border-radius: 50%;
    border: 4px solid var(--bg-primary);
    box-shadow: 0 0 0 4px var(--border-color);
}

.timeline-date {
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 10px;
}

.timeline-content {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 10px;
}

.timeline-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.company {
    padding: 6px 16px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.timeline-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 20px;
}

.timeline-list {
    list-style: none;
}

.timeline-list li {
    color: var(--text-secondary);
    margin-bottom: 15px;
    display: flex;
    gap: 12px;
    line-height: 1.7;
}

.timeline-list i {
    color: var(--primary);
    margin-top: 5px;
    flex-shrink: 0;
}

/* ================================
   Projects Section
   ================================ */

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.project-card {
    background: var(--bg-primary);
    padding: 35px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.project-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-secondary);
    color: white;
    border-radius: 12px;
    font-size: 1.75rem;
    margin-bottom: 20px;
}

.project-card h3 {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.project-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.tag {
    padding: 5px 12px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}

.project-link {
    color: var(--primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.project-link:hover {
    gap: 12px;
}

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

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

.contact-intro {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
}

.contact-methods {
    margin-bottom: 40px;
}

.contact-method {
    display: flex;
    align-items: start;
    gap: 20px;
    margin-bottom: 30px;
}

.method-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    border-radius: 12px;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.method-details h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.method-details p,
.method-details a {
    color: var(--text-secondary);
    font-size: 1rem;
}

.method-details a:hover {
    color: var(--primary);
}

.contact-social {
    display: flex;
    gap: 15px;
}

.social-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    font-weight: 600;
    transition: all 0.3s ease;
}

.social-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

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

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
}

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

.footer-brand {
    font-family: 'Fira Code', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-text {
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: color 0.3s ease;
}

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

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

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .hero-terminal {
        max-width: 600px;
        margin: 0 auto;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .expertise-grid {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: absolute;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 20px;
        gap: 20px;
        display: none;
        box-shadow: var(--shadow-lg);
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-toggle {
        display: flex;
    }

    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(7px, 7px);
    }

    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 2rem;
    }

    .hero-name {
        font-size: 2.5rem;
    }

    .hero-title {
        font-size: 1.375rem;
    }

    .hero-desc {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .timeline {
        padding-left: 30px;
    }

    .timeline::before {
        left: 7px;
    }

    .timeline-dot {
        left: -35px;
    }
}

@media (max-width: 480px) {
    .nav-content {
        padding: 0 20px;
    }

    .hero-name {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .hero-social {
        justify-content: center;
        flex-wrap: wrap;
    }

    .contact-social {
        flex-direction: column;
    }

    .social-btn {
        width: 100%;
        justify-content: center;
    }
}