/* ========================================
   Fullstack Developer Portfolio Resume
   Modern, Interactive, Feature-Rich
   ======================================== */

:root {
    /* Light mode colors */
    --primary-color: #4338ca;
    --primary-dark: #1e1b4b;
    --accent-color: #0891b2;
    --text-primary: #1a2233;
    --text-secondary: #64748b;
    --text-emphasis: #111827;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --border-color: #e1e8ed;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);

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

[data-theme="dark"] {
    --primary-color: #818cf8;
    --primary-dark: #312e81;
    --accent-color: #22d3ee;
    --text-primary: #e5e7eb;
    --text-secondary: #9ca3af;
    --text-emphasis: #f9fafb;
    --bg-primary: #1f2937;
    --bg-secondary: #111827;
    --bg-gradient: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    --border-color: #374151;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Inter', 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-gradient);
    transition: background var(--transition-normal), color var(--transition-normal);
}

/* Container */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

/* Navigation Bar */
.nav-bar {
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: background var(--transition-normal);
}

.nav-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.nav-links {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: color var(--transition-fast);
    padding: 5px 10px;
    border-radius: 4px;
}

.nav-links a:hover {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

.nav-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* Buttons */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

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

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

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

.btn-icon {
    background: transparent;
    color: var(--text-primary);
    padding: 8px;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: var(--bg-secondary);
}

/* Resume Container */
.resume-container {
    background: var(--bg-primary);
    box-shadow: var(--shadow-lg);
    border-radius: 12px;
    overflow: hidden;
    margin-top: 30px;
    margin-bottom: 50px;
    transition: background var(--transition-normal);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 60px 50px;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1) rotate(0deg); opacity: 0.5; }
    50% { transform: scale(1.1) rotate(10deg); opacity: 0.3; }
}

.header-content {
    position: relative;
    z-index: 1;
}

h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 10px;
    letter-spacing: -1px;
}

.subtitle {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 20px;
    opacity: 0.95;
}

.contact-info {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 25px;
    font-size: 15px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.contact-item a {
    color: white;
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    transition: border-color var(--transition-fast);
}

.contact-item a:hover {
    border-bottom-color: rgba(255, 255, 255, 0.8);
}

/* Main Content */
.content {
    padding: 50px;
}

/* Section Styles */
section {
    margin-bottom: 50px;
    scroll-margin-top: 80px;
}

h2 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 25px;
    padding-bottom: 12px;
    border-bottom: 3px solid var(--primary-color);
    font-weight: 700;
    position: relative;
    transition: color var(--transition-normal);
}

h2::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 80px;
    height: 3px;
    background: var(--primary-dark);
}

h3 {
    font-size: 20px;
    color: var(--text-primary);
    margin-top: 25px;
    margin-bottom: 12px;
    font-weight: 600;
    transition: color var(--transition-normal);
}

/* Summary */
.summary {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.05) 100%);
    padding: 30px;
    border-radius: 12px;
    border-left: 5px solid var(--primary-color);
    font-size: 16px;
    line-height: 1.8;
    transition: background var(--transition-normal);
}

.summary strong {
    color: var(--text-emphasis);
    font-weight: 700;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.skill-card {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-normal);
}

.skill-card:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-left-width: 6px;
}

.skill-card:nth-child(1) { border-left-color: #4338ca; }
.skill-card:nth-child(2) { border-left-color: #6d28d9; }
.skill-card:nth-child(3) { border-left-color: #0891b2; }
.skill-card:nth-child(4) { border-left-color: #0d9488; }
.skill-card:nth-child(5) { border-left-color: #b45309; }
.skill-card:nth-child(6) { border-left-color: #be123c; }

.skill-card h3 {
    margin-top: 0;
    margin-bottom: 12px;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.skill-card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-secondary);
    transition: color var(--transition-normal);
}

/* Experience Timeline */
.experience-item {
    margin-bottom: 35px;
    padding: 30px;
    background: var(--bg-secondary);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-normal);
    position: relative;
}

.experience-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.job-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
    transition: color var(--transition-normal);
}

.company-date {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 15px;
    transition: color var(--transition-normal);
}

.experience-item ul {
    margin: 15px 0 15px 25px;
    list-style: none;
}

.experience-item li {
    margin: 12px 0;
    padding-left: 25px;
    position: relative;
    line-height: 1.7;
}

.experience-item li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 16px;
}

.experience-item strong {
    color: var(--text-emphasis);
    font-weight: 700;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin: 25px 0;
}

.project-card {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

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

.project-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    transition: color var(--transition-normal);
}

.project-tech {
    font-size: 13px;
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 12px;
}

.project-description {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-secondary);
    transition: color var(--transition-normal);
}

.project-link {
    margin-top: 12px;
    font-size: 13px;
}

.project-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.project-link a:hover {
    text-decoration: underline;
}

/* Education */
.education-item {
    margin-bottom: 20px;
    padding: 20px 25px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border-left: 3px solid var(--primary-color);
    transition: all var(--transition-normal);
}

.degree {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 16px;
    margin-bottom: 5px;
    transition: color var(--transition-normal);
}

.institution {
    color: var(--text-secondary);
    font-size: 14px;
    transition: color var(--transition-normal);
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 14px;
    transition: all var(--transition-normal);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
    z-index: 999;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.back-to-top.visible {
    display: flex;
}

/* Loading Spinner */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    transition: opacity var(--transition-slow);
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--bg-secondary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .nav-links {
        width: 100%;
        justify-content: space-between;
    }
    
    .header {
        padding: 40px 25px;
    }
    
    h1 {
        font-size: 36px;
    }
    
    .subtitle {
        font-size: 18px;
    }
    
    .content {
        padding: 30px 25px;
    }
    
    .contact-info {
        flex-direction: column;
        gap: 10px;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
    }
    
    .nav-bar,
    .nav-actions,
    .back-to-top,
    .loading-overlay {
        display: none !important;
    }
    
    .resume-container {
        box-shadow: none;
        border-radius: 0;
    }
    
    .header {
        background: var(--primary-color) !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
    
    .content {
        padding: 20px;
    }
    
    section {
        page-break-inside: avoid;
    }
    
    .experience-item,
    .project-card,
    .skill-card {
        page-break-inside: avoid;
    }
}

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

.animate-in {
    animation: fadeInUp 0.6s ease-out;
}

/* Utility Classes */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.highlight {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2) 0%, rgba(118, 75, 162, 0.1) 100%);
    padding: 2px 6px;
    border-radius: 4px;
}