/* Modern Portfolio CSS */

:root {
    /* Colors */
    --color-bg: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-text: #1a1a1a;
    --color-text-secondary: #6c757d;
    --color-accent: #0066ff;
    --color-accent-hover: #0052cc;
    --color-border: #e9ecef;
    --color-card-bg: #ffffff;
    --color-code-bg: #f6f8fa;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, 'Cascadia Code', monospace;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* 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);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

/* Dark Mode */
[data-theme="dark"] {
    --color-bg: #0a0a0a;
    --color-bg-secondary: #1a1a1a;
    --color-text: #e4e4e7;
    --color-text-secondary: #a1a1aa;
    --color-accent: #0066ff;
    --color-accent-hover: #0052cc;
    --color-border: #27272a;
    --color-card-bg: #18181b;
    --color-code-bg: #1a1a1a;
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Base */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-base), color var(--transition-base);
    padding-top: 60px; /* Account for fixed navbar */
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-hover);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-md);
}

[data-theme="dark"] .navbar {
    background: var(--color-bg);
}

[data-theme="dark"] .navbar.scrolled {
    background: rgba(10, 10, 10, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
}

.brand-link {
    color: var(--color-text);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

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

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

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

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
}

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

.theme-toggle svg {
    width: 20px;
    height: 20px;
    stroke: var(--color-text);
}

.theme-toggle .sun-icon {
    display: block;
}

.theme-toggle .moon-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: block;
}

/* Hero Section */
.hero {
    padding: 1.5rem 0 1rem 0;
    min-height: 48vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-text {
    max-width: 600px;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
    transition: transform var(--transition-base);
}

.profile-img:hover {
    transform: scale(1.05);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 8px;
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    border: none;
    font-size: 1rem;
}

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

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

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

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--color-accent);
    border: 2px solid var(--color-accent);
}

.btn-outline:hover {
    background: var(--color-accent);
    color: white;
}

/* Social Links */
.social-links {
    display: flex;
    gap: var(--spacing-lg);
}

.social-links a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.social-links a:hover {
    color: var(--color-accent);
    transform: translateY(-2px);
}

/* Sections */
section {
    padding: 5rem 0;
}

.section {
    padding: 5rem 0;
}

.about {
    padding: 1.75rem 0;
    background: var(--color-bg);
}

.skills {
    padding: 5rem 0;
    background: var(--color-bg-secondary);
}

.blog {
    padding: 5rem 0;
    background: var(--color-bg);
}

.contact {
    padding: 5rem 0;
    background: var(--color-bg-secondary);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--color-accent);
    margin: var(--spacing-lg) auto 0;
    border-radius: 2px;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.skill-category {
    background: var(--color-card-bg);
    padding: var(--spacing-xl);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.skill-category:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.skill-category h3 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

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

.skill-list li {
    padding: var(--spacing-sm) 0;
    color: var(--color-text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.skill-list li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: 0.75rem;
}

/* Blog Grid */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-2xl);
}

/* Blog CTA spacing */
.blog-cta {
    margin-top: var(--spacing-2xl);
}

.blog-card {
    background: var(--color-card-bg);
    border-radius: 12px;
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

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

.blog-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.blog-category {
    background: var(--color-accent);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    font-size: 0.875rem;
    font-weight: 500;
}

.blog-date {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.blog-card-title {
    margin-bottom: var(--spacing-md);
}

.blog-card-title a {
    color: var(--color-text);
    font-weight: 600;
}

.blog-card-excerpt {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.blog-card-link {
    color: var(--color-accent);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.blog-card-link:hover {
    gap: var(--spacing-md);
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

/* Contact Section */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-methods {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
    justify-content: center;
    margin: var(--spacing-2xl) 0;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: all var(--transition-fast);
}

.contact-link:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-3xl);
}

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

.footer-links {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.footer-links a {
    color: var(--color-text-secondary);
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero {
        padding: 1.75rem 0 0.75 0;
        min-height: auto;
    }
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 60px;
        flex-direction: column;
        background: var(--color-bg);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-xl) 0;
        border-top: 1px solid var(--color-border);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text {
        order: 2;
    }

    .hero-image {
        order: 1;
        margin-bottom: var(--spacing-xs);
    }

    .profile-img {
        max-width: 250px;
    }

    .hero-title {
        margin-bottom: var(--spacing-md);
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .social-links {
        justify-content: center;
    }

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

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

    .contact-methods {
        flex-direction: column;
        align-items: center;
    }
}

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

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

.fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}

/* Code Blocks */
pre {
    background: var(--color-code-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
}

code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background: var(--color-code-bg);
    padding: 2px 6px;
    border-radius: 4px;
}

pre code {
    background: none;
    padding: 0;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.grid { display: grid; }

/* Loading State */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--color-border);
    border-radius: 50%;
    border-top-color: var(--color-accent);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}