/* =========================================
   CSS Reset and Root Variables
   ========================================= */
   :root {
    /* Main Colors */
    --primary: #0a66c2;
    --secondary: #f3f2ef;
    --text: #2c3e50;
    --hover: #004182;
    --gray: #666666;
    --light: #f9fafb;
    --card: #ffffff;
    --border: #e0e0e0;

    /* Additional Colors */
    --success: #0cce6b;
    --warning: #ffd700;
    --error: #ff4444;
    --info: #0dcaf0;

    /* Shadows */
    --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 15px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Section Title Gradients */
    --title-gradient: linear-gradient(90deg, var(--primary) 0%, var(--hover) 100%);
    
    /* Responsive spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --primary: #64ffda;
    --secondary: #0a192f;
    --text: #e6f1ff;
    --hover: #64ffda;
    --gray: #8892b0;
    --light: #112240;
    --card: #0a192f;
    --border: #233554;
}

/* =========================================
   Base Styles
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--secondary);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* =========================================
   Layout Container
   ========================================= */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-xl);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-2xl);
    }
}

main {
    padding-top: 5rem;
    min-height: 100vh;
}

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

h1 { 
    font-size: clamp(2rem, 5vw, 3rem);
}
h2 { 
    font-size: clamp(1.5rem, 4vw, 2.25rem);
}
h3 { 
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
    margin-bottom: var(--space-md);
    color: var(--gray);
    font-size: clamp(0.875rem, 2vw, 1rem);
}

/* =========================================
   Navigation
   ========================================= */
.navbar {
    background: var(--card);
    padding: var(--space-md) 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

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

.logo {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    color: var(--primary);
    text-decoration: none;
    font-weight: 700;
    transition: color var(--transition-normal);
}

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

.nav-links {
    display: none;
    gap: var(--space-xl);
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
    }
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: all var(--transition-normal);
    position: relative;
    padding: var(--space-sm) 0;
    font-size: clamp(0.875rem, 2vw, 1rem);
}

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

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

/* =========================================
   Card Component
   ========================================= */
.card {
    background: var(--card);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
    width: 100%;
}

@media (min-width: 768px) {
    .card {
        padding: var(--space-2xl);
    }
}

/* =========================================
   Hero Section
   ========================================= */
.hero {
    background: var(--card);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-bottom: var(--space-xl);
}

.hero-banner {
    height: clamp(200px, 30vw, 300px);
    background: linear-gradient(135deg, var(--primary), var(--hover));
    position: relative;
    overflow: hidden;
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(255,255,255,0.1) 2px, transparent 2px),
        radial-gradient(circle at 75% 75%, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px, 25px 25px;
    animation: patternMove 20s linear infinite;
}

@keyframes patternMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.floating-icons {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.icon-item {
    position: absolute;
    left: var(--x);
    top: var(--y);
    color: rgba(255, 255, 255, 0.3);
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    animation: float 6s ease-in-out infinite;
    animation-delay: var(--delay);
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(10deg); }
}

.profile-section {
    padding: var(--space-xl);
    position: relative;
    text-align: center;
}

@media (min-width: 768px) {
    .profile-section {
        padding: var(--space-2xl);
    }
}

.profile-info {
    margin-top: 0;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin-top: var(--space-xl);
    flex-wrap: wrap;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-normal);
    font-size: clamp(0.9rem, 2vw, 1rem);
    min-width: 140px;
    justify-content: center;
}

.cta-button.primary {
    background: var(--primary);
    color: white;
    box-shadow: var(--shadow-md);
}

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

.cta-button.secondary {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.headline {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--gray);
    margin-bottom: var(--space-md);
}

.location {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--gray);
    font-size: clamp(0.875rem, 2vw, 1rem);
    justify-content: center;
}

/* =========================================
   Section Styles
   ========================================= */
.section {
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-normal);
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-title {
    position: relative;
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-md);
    color: var(--primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.section-title span {
    position: relative;
    z-index: 1;
}

.title-decoration {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--border);
}

.section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: clamp(60px, 10vw, 100px);
    height: 3px;
    background: var(--title-gradient);
}

.github-link {
    color: var(--primary);
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    transition: all var(--transition-normal);
}

.github-link:hover {
    color: var(--hover);
    transform: scale(1.1);
}

/* =========================================
   Projects Section
   ========================================= */
.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

@media (min-width: 768px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .projects-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

.project-card {
    background: var(--light);
    padding: var(--space-xl);
    border-radius: 12px;
    transition: all var(--transition-normal);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.project-title {
    color: var(--primary);
    margin-bottom: var(--space-sm);
    font-size: clamp(1.1rem, 2.5vw, 1.25rem);
}

.project-desc {
    color: var(--gray);
    margin-bottom: var(--space-md);
    flex-grow: 1;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.tech-tag {
    background: var(--card);
    color: var(--primary);
    padding: var(--space-xs) var(--space-md);
    border-radius: 15px;
    font-size: clamp(0.75rem, 1.5vw, 0.875rem);
    white-space: nowrap;
}

.project-links {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-top: auto;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--primary);
    text-decoration: none;
    font-size: clamp(0.8rem, 1.8vw, 0.9rem);
    padding: var(--space-sm) var(--space-md);
    border-radius: 20px;
    background: rgba(10, 102, 194, 0.1);
    transition: all var(--transition-normal);
}

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

/* =========================================
   Skills Section
   ========================================= */
.skills-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

@media (min-width: 768px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.skill-item {
    background: var(--light);
    padding: var(--space-xl);
    border-radius: 12px;
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    transition: all var(--transition-normal);
    height: 100%;
}

.skill-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.skill-icon {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    color: var(--primary);
    background: rgba(10, 102, 194, 0.1);
    padding: var(--space-md);
    border-radius: 10px;
    transition: transform var(--transition-normal);
    flex-shrink: 0;
}

.skill-item:hover .skill-icon {
    transform: scale(1.1);
}

.skill-info {
    flex: 1;
}

.skill-info h3 {
    font-size: clamp(1rem, 2.2vw, 1.1rem);
    margin-bottom: var(--space-sm);
    color: var(--text);
}

.skill-info p {
    font-size: clamp(0.8rem, 1.8vw, 0.9rem);
    color: var(--gray);
    margin: 0;
}

/* =========================================
   Experience Section
   ========================================= */
.experience-item {
    background: var(--light);
    padding: var(--space-xl);
    border-radius: 12px;
    transition: all var(--transition-normal);
}

@media (min-width: 768px) {
    .experience-item {
        padding: var(--space-2xl);
    }
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.experience-role h3 {
    font-size: clamp(1.1rem, 2.5vw, 1.25rem);
    margin-bottom: var(--space-sm);
}

.experience-duration {
    display: inline-block;
    background: rgba(10, 102, 194, 0.1);
    color: var(--primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: 20px;
    font-size: clamp(0.8rem, 1.8vw, 0.9rem);
    font-weight: 500;
    white-space: nowrap;
}

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

.experience-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    margin-bottom: var(--space-sm);
    border-radius: 8px;
    transition: background-color var(--transition-normal);
}

.experience-list li:hover {
    background: rgba(0, 0, 0, 0.02);
}

.experience-list i {
    color: var(--primary);
    margin-top: 0.25rem;
    flex-shrink: 0;
}

.experience-list span {
    font-size: clamp(0.875rem, 2vw, 1rem);
}

/* =========================================
   Contact Section
   ========================================= */
.contact-links {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    color: var(--text);
    text-decoration: none;
    padding: var(--space-md);
    border-radius: 8px;
    transition: all var(--transition-normal);
    font-size: clamp(0.9rem, 2vw, 1rem);
}

.contact-link:hover {
    color: var(--primary);
    transform: translateY(-3px);
}

.contact-link i {
    font-size: clamp(1.1rem, 2.5vw, 1.25rem);
}

/* =========================================
   Progress Bar
   ========================================= */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--primary);
    z-index: 1001;
    transition: width 0.3s ease;
    width: 0;
}

/* =========================================
   Theme Toggle
   ========================================= */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    padding: var(--space-sm);
    border-radius: 50%;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.theme-toggle:hover {
    color: var(--primary);
    background: rgba(10, 102, 194, 0.1);
}

/* =========================================
   Responsive Improvements
   ========================================= */
@media (max-width: 480px) {
    :root {
        --space-xl: 1rem;
        --space-2xl: 1.5rem;
    }
    
    .hero-banner {
        height: 180px;
    }
    
    .profile-info {
        margin-top: 0;
        text-align: center;
    }
    
    .section-title {
        flex-direction: column;
        text-align: center;
    }
    
    .experience-header {
        flex-direction: column;
        text-align: center;
    }
    
    .contact-links {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-button {
        width: 100%;
        max-width: 200px;
    }
}

/* =========================================
   Loading States
   ========================================= */
body:not(.loaded) {
    overflow: hidden;
}

body:not(.loaded)::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--card);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

body:not(.loaded)::after {
    content: 'Loading...';
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--primary);
    font-size: 1.2rem;
    z-index: 10000;
}

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

.animate-fade-in {
    animation: fadeIn var(--transition-normal);
}

/* =========================================
   Print Styles
   ========================================= */
@media print {
    .navbar, .theme-toggle, .progress-bar {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .card, .project-card, .skill-item, .experience-item {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}