/* 
 * Portfolio Website - Main Stylesheet
 * Dark theme with blue accents
 */

/* ===== VARIABLES ===== */
:root {
    /* Colors */
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-tertiary: #2d2d2d;
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0b0;
    --accent-primary: #0077ff;
    --accent-secondary: #00c7ff;
    --success: #4caf50;
    --warning: #ff9800;
    --error: #f44336;
    
    /* Typography */
    --font-primary: 'Poppins', sans-serif;
    --font-secondary: 'Roboto', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    
    /* Borders */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    --border-radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3);
}

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

ul {
    list-style: none;
}

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

button, .btn {
    cursor: pointer;
    font-family: var(--font-primary);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3.5rem;
}

h2 {
    font-size: 2.5rem;
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-lg);
}

h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -10px;
    width: 60px;
    height: 4px;
    background-color: var(--accent-primary);
    border-radius: var(--border-radius-full);
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.5rem;
}

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

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

/* ===== LAYOUT ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

/* ===== PARTICLES BACKGROUND ===== */
.particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

/* ===== HEADER & NAVIGATION ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    background-color: rgba(18, 18, 18, 0.8);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

header.scrolled {
    padding: var(--spacing-sm) var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
}

.logo span {
    color: var(--accent-primary);
    background-color: var(--bg-tertiary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
}

nav ul {
    display: flex;
    gap: var(--spacing-lg);
}

nav a {
    color: var(--text-primary);
    font-weight: 500;
    position: relative;
    padding: var(--spacing-xs) 0;
}

nav a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: width var(--transition-normal);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    cursor: pointer;
}

.hamburger span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--text-primary);
    transition: all var(--transition-fast);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-full);
    font-weight: 500;
    text-align: center;
    transition: all var(--transition-fast);
    border: none;
    outline: none;
}

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

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

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

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

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    justify-content: center;
    align-items: center;
}

.section-cta {
    text-align: center;
    margin-top: var(--spacing-lg);
}

/* ===== HERO SECTION ===== */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(0, 119, 255, 0.1), transparent 50%);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    text-align: center;
}

.hero h1 {
    margin-bottom: var(--spacing-sm);
}

.greeting {
    display: block;
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.name {
    font-size: 4rem;
    background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.typewriter {
    font-size: 1.5rem;
    font-weight: 500;
    height: 2rem;
    margin-bottom: var(--spacing-lg);
}

.cursor {
    display: inline-block;
    width: 3px;
    background-color: var(--accent-primary);
    animation: blink 1s infinite;
}

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

.hero-description {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
    color: var(--text-secondary);
}

/* ===== SKILLS PREVIEW SECTION ===== */
.skills-preview {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.skill-card {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background-color: var(--accent-primary);
    transition: height var(--transition-normal);
}

.skill-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.skill-card:hover::before {
    height: 100%;
}

.skill-icon {
    font-size: 2.5rem;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-md);
}

.skill-card h3 {
    margin-bottom: var(--spacing-sm);
}

.skill-card p {
    color: var(--text-secondary);
}

/* ===== LATEST ARTICLES SECTION ===== */
.latest-articles {
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
}

.articles-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.article-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.article-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.article-image {
    height: 200px;
    background-color: var(--bg-tertiary);
    position: relative;
    overflow: hidden;
}

.placeholder-image {
    background: linear-gradient(135deg, var(--bg-tertiary) 25%, var(--bg-secondary) 25%, var(--bg-secondary) 50%, var(--bg-tertiary) 50%, var(--bg-tertiary) 75%, var(--bg-secondary) 75%);
    background-size: 20px 20px;
    animation: moveBackground 30s linear infinite;
}

@keyframes moveBackground {
    0% { background-position: 0 0; }
    100% { background-position: 400px 400px; }
}

.article-content {
    padding: var(--spacing-lg);
    text-align: left;
}

.article-tag {
    display: inline-block;
    background-color: rgba(0, 119, 255, 0.1);
    color: var(--accent-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-full);
    font-size: 0.8rem;
    margin-bottom: var(--spacing-sm);
}

.article-card h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-fast);
}

.article-card:hover h3 {
    color: var(--accent-primary);
}

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

.read-more {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 500;
    transition: gap var(--transition-fast);
}

.read-more:hover {
    gap: var(--spacing-sm);
}

/* ===== FOOTER ===== */
footer {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    text-align: center;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-full);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    background-color: var(--accent-primary);
    color: white;
    transform: translateY(-3px);
}

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

/* ===== ANIMATIONS ===== */
.animate-text {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s forwards 0.5s;
}

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

/* ===== RESPONSIVE STYLES ===== */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .name {
        font-size: 3rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .hamburger {
        display: flex;
    }
    
    nav ul {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: var(--bg-secondary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right var(--transition-normal);
        z-index: 999;
    }
    
    nav.active ul {
        right: 0;
    }
    
    .skills-container,
    .articles-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .name {
        font-size: 2.5rem;
    }
    
    .hero {
        height: auto;
        min-height: 100vh;
    }
}