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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ===== CSS VARIABLES ===== */
:root {
    /* Light Mode Colors */
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --bg-color: #ffffff;
    --bg-secondary: #f8fafc;
    --text-color: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-large: 0 10px 25px rgba(0, 0, 0, 0.15);
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-secondary: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --primary-color: #60a5fa;
    --primary-dark: #3b82f6;
    --secondary-color: #94a3b8;
    --accent-color: #fbbf24;
    --bg-color: #0f172a;
    --bg-secondary: #1e293b;
    --text-color: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-large: 0 10px 25px rgba(0, 0, 0, 0.4);
    --gradient-primary: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
    --gradient-secondary: linear-gradient(135deg, #fbbf24 0%, #f87171 100%);
}

/* ===== UTILITY CLASSES ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 16px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-medium);
}

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

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

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

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 16px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== DARK MODE TOGGLE ===== */
/* Default for desktop */
.dark-mode-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  background-color: transparent;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--text-color, #333);
}

/* Fix for mobile */
@media (max-width: 768px) {
  .dark-mode-toggle {
    top: 1rem;
    left: 1rem; /* Move it to the left on smaller screens */
    right: auto;
  }
}

.dark-mode-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-large);
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

[data-theme="dark"] .navbar {
    background: rgba(15, 23, 42, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

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

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    margin: 3px 0;
    transition: 0.3s;
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="a" cx="50%" cy="50%"><stop offset="0%" stop-color="%233b82f6" stop-opacity="0.1"/><stop offset="100%" stop-color="%233b82f6" stop-opacity="0"/></radialGradient></defs><circle cx="200" cy="200" r="300" fill="url(%23a)"/><circle cx="800" cy="800" r="400" fill="url(%23a)"/></svg>');
    opacity: 0.5;
    z-index: 0;
}

.hero-container {
    position: relative;
    z-index: 1;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.profile-image-container {
    margin-bottom: 2rem;
}

.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 6px solid var(--primary-color);
    box-shadow: var(--shadow-large);
    transition: transform 0.3s ease;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid var(--border-color);
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

/* ===== ABOUT SECTION ===== */
.about {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.stat {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-color);
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease;
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

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

.about-image {
    text-align: center;
}

.about-photo {
    width: 100%;
    max-width: 400px;
    border-radius: 12px;
    box-shadow: var(--shadow-large);
    transition: transform 0.3s ease;
}

.about-photo:hover {
    transform: scale(1.02);
}

/* ===== PROJECTS SECTION ===== */
.projects {
    padding: 100px 0;
    background: var(--bg-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-large);
}

.project-image {
    position: relative;
    overflow: hidden;
    height: 250px;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(59, 130, 246, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.project-links {
    display: flex;
    gap: 1rem;
}

.project-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: white;
    color: var(--primary-color);
    border-radius: 50%;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.project-link:hover {
    transform: scale(1.1);
}

.project-content {
    padding: 2rem;
}

.project-title {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-tag {
    background: var(--primary-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* ===== SKILLS SECTION ===== */
.skills {
    padding: 100px 0;
    background: var(--bg-secondary);
}

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

.skills-categories {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.skill-category {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
}

.category-title {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.skill-name {
    font-weight: 500;
    color: var(--text-color);
}

.skill-percentage {
    font-weight: 600;
    color: var(--primary-color);
}

.skill-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    width: 0%;
    transition: width 1.5s ease-in-out;
}

/* Circular Skills */
.circular-skills {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    text-align: center;
}

.circular-skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.circular-skill {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.circular-progress {
    width: 120px;
    height: 120px;
}

.circular-chart {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    max-height: 100%;
}

.circle-bg {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 2.8;
}

.circle {
    fill: none;
    stroke-width: 2.8;
    stroke-linecap: round;
    animation: progress 1.5s ease-in-out forwards;
    stroke: url(#gradient);
}

.percentage {
    fill: var(--text-color);
    font-family: 'Inter', sans-serif;
    font-size: 0.5em;
    text-anchor: middle;
    font-weight: 600;
}

.skill-label {
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.9rem;
}

@keyframes progress {
    0% {
        stroke-dasharray: 0 100;
    }
}

/* ===== EDUCATION SECTION ===== */
.education {
    padding: 100px 0;
    background: var(--bg-color);
}

.education-timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.education-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
    transform: translateX(-50%);
}

.education-item {
    display: flex;
    align-items: center;
    margin-bottom: 4rem;
    position: relative;
}

.education-item:nth-child(odd) {
    flex-direction: row;
}

.education-item:nth-child(even) {
    flex-direction: row-reverse;
}

.education-icon {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    z-index: 2;
    box-shadow: var(--shadow-medium);
}

.education-details {
    flex: 1;
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    margin: 0 3rem;
    transition: transform 0.3s ease;
}

.education-details:hover {
    transform: translateY(-5px);
}

.education-title {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.education-institution {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.education-period {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.education-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.education-progress {
    margin-top: 1rem;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.progress-label {
    color: var(--text-color);
    font-weight: 500;
}

.progress-percentage {
    color: var(--primary-color);
    font-weight: 600;
}

.progress-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    width: 0%;
    transition: width 1.5s ease-in-out;
}

/* ===== CONTACT SECTION ===== */
.contact {
    padding: 100px 0;
    background: var(--bg-secondary);
}

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

.contact-info h3 {
    font-size: 2rem;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.contact-info p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
    line-height: 1.6;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-text h4 {
    color: var(--text-color);
    margin-bottom: 0.25rem;
}

.contact-text p {
    color: var(--text-secondary);
    margin: 0;
}

.social-links-contact {
    display: flex;
    gap: 1rem;
}

.social-links-contact a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--bg-color);
    color: var(--text-secondary);
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid var(--border-color);
}

.social-links-contact a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.contact-form {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-text p {
    color: var(--text-secondary);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    /* Navigation */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-color);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-medium);
        padding: 2rem 0;
        border-top: 1px solid var(--border-color);
    }

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

    .nav-menu li {
        margin: 1rem 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    /* Hero Section */
    .hero-title {
        font-size: 2.5rem;
    }

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

    .profile-image {
        width: 150px;
        height: 150px;
    }

    /* About Section */
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .about-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    /* Skills Section */
    .skills-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    /* Education Section */
    .education-timeline::before {
        left: 30px;
    }

    .education-item {
        flex-direction: row !important;
        padding-left: 80px;
    }

    .education-icon {
        left: 30px;
        transform: translateX(-50%);
    }

    .education-details {
        margin: 0;
    }

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

    /* Projects Grid */
    .projects-grid {
        grid-template-columns: 1fr;
    }

    /* Footer */
    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .section-title {
        font-size: 2rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }

    .project-content {
        padding: 1.5rem;
    }

    .skill-category,
    .circular-skills,
    .contact-form {
        padding: 1.5rem;
    }

    .education-details {
        padding: 1.5rem;
    }
}

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

/* Smooth scrolling for older browsers */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* Focus styles for accessibility */
button:focus,
input:focus,
textarea:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.3);
        --shadow-medium: 0 4px 8px rgba(0, 0, 0, 0.3);
        --shadow-large: 0 8px 16px rgba(0, 0, 0, 0.3);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}