/* Modern Variables */
:root {
    /* Colors */
    --primary-color: #2d46b9;
    --secondary-color: #1a1a1a;
    --accent-color: #4d5deb;
    --text-primary: #333333;
    --text-secondary: #666666;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --error-color: #dc3545;
    
    /* Animations */
    --transition-fast: 0.3s ease;
    --transition-medium: 0.5s ease;
    --transition-slow: 0.8s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px 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);
    
    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
}

/* Dark Theme Colors */
[data-theme="dark"] {
    --primary-color: #4d5deb;
    --secondary-color: #ffffff;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
}

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

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

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 6rem 0;
}

/* Floating Social Bar */
.social-bar {
    position: fixed;
    left: 2rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.social-icon {
    width: 40px;
    height: 40px;
    background: var(--bg-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition-fast);
    position: relative;
}

.social-icon:hover {
    transform: translateY(-3px);
    color: var(--accent-color);
}

.social-icon .tooltip {
    position: absolute;
    left: 50px;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    border-radius: var(--border-radius-sm);
    font-size: 0.8rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-fast);
    white-space: nowrap;
}

.social-icon:hover .tooltip {
    opacity: 1;
    visibility: visible;
}

/* Navigation */
.nav-wrapper {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    transition: var(--transition-fast);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo a {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition-fast);
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 2rem 4rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(45,70,185,0.1) 0%, rgba(45,70,185,0) 100%);
    z-index: -1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.typing-wrapper {
    display: flex;
    align-items: center;
    height: 65px;
    margin: 2rem 0;
    gap: 8px;
}

.static-text {
    font-size: 1.5rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.dynamic-texts {
    list-style: none;
    height: 65px;
    line-height: 65px;
    overflow: hidden;
}

.dynamic-texts li {
    position: relative;
    top: 0;
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 500;
}

.dynamic-texts li span {
    position: relative;
    display: block;
    white-space: nowrap;
}

.tech-stack {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.tech-stack img {
    width: 40px;
    height: 40px;
    object-fit: contain;
    transition: var(--transition-fast);
}

.tech-stack img:hover {
    transform: translateY(-5px);
}

/* Profile Image & Experience Badge */
.hero-image {
    position: relative;
}

.profile-image {
    width: 100%;
    max-width: 400px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-medium);
}

.experience-badge {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    background: var(--primary-color);
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: float 3s ease-in-out infinite;
}

.experience-badge .years {
    font-size: 2rem;
    font-weight: 700;
}

/* Achievement Cards */
.achievement-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.achievement-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition-medium);
}

.achievement-card:hover {
    transform: translateY(-5px);
}

.achievement-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Skills Section */
.skills-container {
    display: grid;
    gap: 3rem;
}

.skills-category h3 {
    margin-bottom: 2rem;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-item {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--border-radius-md);
    position: relative;
}

.skill-item i {
    color: var(--primary-color);
    margin-right: 0.5rem;
}

.skill-level {
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
    margin-top: 0.5rem;
}

/* Projects Section */
.projects-filter {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    border: none;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary-color);
    color: white;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-medium);
}

.project-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/9;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-medium);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(45,70,185,0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-medium);
}

.project-details {
    color: white;
    text-align: center;
    padding: 2rem;
}

.project-tech {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin: 1rem 0;
}

.project-tech span {
    padding: 0.25rem 0.75rem;
    background: rgba(255,255,255,0.2);
    border-radius: var(--border-radius-sm);
    font-size: 0.8rem;
}

.project-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: white;
    color: var(--primary-color);
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    transition: var(--transition-fast);
}

.project-card:hover {
    transform: translateY(-10px);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-card:hover .project-image img {
    transform: scale(1.1);
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
}

.contact-info {
    display: grid;
    gap: 2rem;
}

.contact-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--border-radius-md);
    text-align: center;
}

.contact-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.contact-form {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    max-width: 600px;
    width: 100%;
}

.form-group {
    position: relative;
    margin-bottom: 2rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    font-size: 1rem;
    border: 2px solid var(--text-secondary);
    border-radius: var(--border-radius-sm);
    background: transparent;
    color: var(--text-primary);
    transition: var(--transition-fast);
    outline: none;
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-group label {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: var(--bg-primary);
    padding: 0 0.5rem;
    color: var(--text-secondary);
    font-size: 1rem;
    transition: var(--transition-fast);
    pointer-events: none;
}

.form-group textarea ~ label {
    top: 1rem;
    transform: translateY(0);
}

/* Label animation when input is focused or has content */
.form-group input:focus ~ label,
.form-group input:valid ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:valid ~ label {
    top: 0;
    font-size: 0.8rem;
    color: var(--primary-color);
}

/* Border animation */
.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
}

.focus-border {
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition-fast);
}

.form-group input:focus ~ .focus-border,
.form-group textarea:focus ~ .focus-border {
    width: 100%;
    left: 0;
}

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

.submit-btn i {
    transition: var(--transition-fast);
}

.submit-btn:hover i {
    transform: translateX(5px);
}

.primary-btn,
.secondary-btn {
    position: relative;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--border-radius-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    cursor: pointer;
}

.btn-content {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    position: relative;
    z-index: 1;
}

/* Primary Button Styles */
.primary-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    box-shadow: 0 4px 15px rgba(45, 70, 185, 0.2);
}

.primary-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(45, 70, 185, 0.3);
}

.primary-btn .fas.fa-arrow-right {
    transition: transform 0.3s ease;
}

.primary-btn:hover .fas.fa-arrow-right {
    transform: translateX(5px);
}

/* Secondary Button Styles */
.secondary-btn {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    position: relative;
}

.btn-hover-effect {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    opacity: 0;
    transition: left 0.3s ease;
    z-index: 0;
}

.secondary-btn:hover .btn-content {
    color: white;
}

.secondary-btn .btn-content {
    position: relative;
    z-index: 1;
    transition: color 0.3s ease;
}

.secondary-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(45, 70, 185, 0.2);
}

.secondary-btn:hover .btn-hover-effect {
    left: 0;
}

/* Button Icons Animation */
.primary-btn i,
.secondary-btn i {
    font-size: 1.1rem;
    transition: transform 0.3s ease;
}

.primary-btn:hover i.fa-code,
.secondary-btn:hover i.fa-file-download {
    transform: scale(1.1);
}

/* Download Button States */
.secondary-btn[download] .btn-content {
    transition: all 0.3s ease;
}

.secondary-btn[download]:active {
    transform: scale(0.95);
}

/* Loading State */
.secondary-btn[download].loading {
    pointer-events: none;
    opacity: 0.8;
}

.secondary-btn[download].loading .fa-file-download {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Notification Styles */
.notification {
    font-family: 'Poppins', sans-serif;
    font-size: 0.9rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.notification.success {
    background: linear-gradient(135deg, #28a745, #20c997);
}

.notification.error {
    background: linear-gradient(135deg, #dc3545, #f56036);
}

/* Download Animation for CV Button */
@keyframes downloading {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(100%); }
}

.secondary-btn:active i.fa-file-download {
    animation: downloading 0.3s ease;
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    margin-top: 2.5rem;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-bottom: 2rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--text-secondary);
}

/* Scroll to Top */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-fast);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

/* Animations */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .social-bar {
        left: 1rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .nav-links {
        display: none;
    }

    .social-bar {
        display: none;
    }

    .hero {
        padding: 6rem 1rem 3rem;
    }

    .achievement-cards {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-form {
        padding: 1.5rem;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 1rem;
    }

    .primary-btn,
    .secondary-btn {
        width: 100%;
        text-align: center;
        justify-content: center;
    }

    .btn-content {
        justify-content: center;
    }
}

/* Dark theme adjustments */
[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
    border-color: rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .form-group label {
    background: var(--bg-primary);
    color: var(--text-secondary);
}

[data-theme="dark"] .secondary-btn {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

[data-theme="dark"] .primary-btn {
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
}

@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 2.5rem;
    }

    .projects-filter {
        flex-wrap: wrap;
    }
}