/* Base styles */
:root {
    --bg-color: #0a192f;
    --text-color: #e6f1ff;
    --primary-color: #0b27b3;
    --secondary-color: #8892b0;
    --card-bg: #112240;
    --heading-color: #ffffff;
    --accent-color: #00cc7e;
    --hover-color: #1cb4de;
    --form-bg: rgba(17, 34, 64, 0.7);
    --input-border: rgba(0, 255, 157, 0.2);
    --input-focus: rgba(0, 255, 157, 0.5);
    --gradient-start: #084fa0;
    --gradient-end: #00cc7e;
    --transition: all 0.3s ease;
    --primary-color-rgb: 0, 255, 157;
    --card-bg-rgb: 17, 34, 64;
}

/* Light Theme Variables */
[data-theme="light"] {
    --bg-color: #ffffff;
    --text-color: #333333;
    --heading-color: #1a1a1a;
    --secondary-color: #4a5568;
    --primary-color: #008255;
    --hover-color: #006e47;
    --card-bg: #f8fafc;
    --card-border: rgba(0, 130, 85, 0.15);
    --card-hover: rgba(0, 130, 85, 0.05);
    --nav-bg: rgba(255, 255, 255, 0.98);
    --nav-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    --input-bg: #ffffff;
    --input-border: #e2e8f0;
    --input-focus: rgba(0, 130, 85, 0.2);
    --gradient-start: #008255;
    --gradient-end: #006e47;
    --primary-color-rgb: 0, 130, 85;
    --card-bg-rgb: 248, 250, 252;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Header Styles */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--nav-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--card-border);
    transition: var(--transition);
}

nav {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    text-shadow: 0 0 10px rgba(0, 255, 157, 0.2);
}

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

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

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

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

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

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: var(--transition);
    z-index: 1002;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(0, 255, 157, 0.1);
}

.theme-toggle:hover {
    color: var(--primary-color);
    background-color: rgba(0, 255, 157, 0.2);
}

/* About Section */
.about-section {
    padding: 8rem 2rem 4rem;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

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

.about-text {
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-text p {
    margin-bottom: 1.5rem;
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-image {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-color);
    box-shadow: 0 0 20px rgba(0, 255, 157, 0.2);
}

/* Skills Section */
.skills-section {
    padding: 6rem 2rem;
    background-color: var(--card-bg);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.skill-category {
    background-color: var(--bg-color);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--card-border);
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-size: 1.5rem;
    text-align: center;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.skill-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
}

.skill-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 1.5rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    transition: var(--transition);
}

.skill-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 255, 157, 0.1);
}

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

.skill-item span {
    font-size: 1.1rem;
    font-weight: 500;
}

/* Education Section */
.education-section {
    padding: 6rem 2rem;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 3rem auto;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background-color: var(--primary-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    width: 50%;
    padding-right: 2rem;
}

.timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 2rem;
}

.timeline-content {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--card-border);
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.timeline-content .institution {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.timeline-content .period {
    color: var(--text-color);
    font-weight: 500;
}

/* Achievements Section */
.achievements-section {
    padding: 6rem 2rem;
    background-color: rgba(var(--card-bg-rgb), 0.3);
}

.achievements-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--input-border);
    padding-bottom: 0.5rem;
}

.tab-btn {
    background: none;
    border: none;
    padding: 0.75rem 1.5rem;
    margin: 0 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary-color);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    border-radius: 4px 4px 0 0;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 1px;
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease forwards;
}

.tab-content.active {
    display: block;
}

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

.achievement-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    border: 1px solid var(--card-border, rgba(255, 255, 255, 0.05));
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
}

.achievement-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    border-color: var(--primary-color);
}

.achievement-icon {
    font-size: 2rem;
    color: var(--primary-color);
    background-color: rgba(var(--primary-color-rgb), 0.1);
    height: 60px;
    width: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.achievement-details {
    flex: 1;
}

.achievement-details h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--heading-color);
}

.achievement-date {
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-style: italic;
}

.achievement-details p {
    color: var(--text-color);
    line-height: 1.6;
}

/* Section Headers */
section h1,
section h2 {
    text-align: center;
    color: var(--heading-color);
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
}

section h1::after,
section h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--card-bg);
    color: var(--secondary-color);
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1002;
}

/* Mobile Menu Backdrop */
.mobile-menu-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-menu-backdrop.active {
    opacity: 1;
    visibility: visible;
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 400px;
        height: 100vh;
        background-color: var(--card-bg);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        transition: right 0.3s ease;
        z-index: 1000;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .achievements-tabs {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        margin-bottom: 0.5rem;
    }
    
    .achievements-grid {
        grid-template-columns: 1fr;
    }
    
    .achievement-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .achievement-icon {
        margin-bottom: 1rem;
    }
}

@media (max-width: 480px) {
    .about-section {
        padding: 6rem 1rem 3rem;
    }

    .profile-image {
        width: 200px;
        height: 200px;
    }

    .skill-category {
        padding: 1.5rem;
    }

    .skill-item {
        padding: 1rem;
    }

    .timeline-content {
        padding: 1.5rem;
    }
}

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

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* Optimize animations */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Toggle Button Styles */
.toggle-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 1rem auto;
    padding: 0.8rem 1.5rem;
    background-color: var(--primary-color);
    color: var(--bg-color);
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.toggle-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 255, 157, 0.2);
}

.toggle-btn i {
    transition: transform 0.3s ease;
}

.toggle-btn:hover i {
    transform: translateY(2px);
}