/* Variables */
:root {
    /* Theme Colors */
    --light-bg: #f9f9f9;
    --light-text: #333333;
    --light-accent: #4a6fa5;
    --light-accent-hover: #3a5a8a;
    --light-card-bg: #ffffff;
    --light-card-shadow: rgba(0, 0, 0, 0.1);
    --light-navbar-bg: rgba(255, 255, 255, 0.95);
    --light-border: #e0e0e0;
    --light-secondary-bg: rgba(0, 0, 0, 0.05);
    --accent-dot-light: #ff6347;
    
    /* Dark Theme Colors */
    --dark-bg: #121212;
    --dark-text: #e0e0e0;
    --dark-accent: #64b5f6;
    --dark-accent-hover: #90caf9;
    --dark-card-bg: #1e1e1e;
    --dark-card-shadow: rgba(0, 0, 0, 0.3);
    --dark-navbar-bg: rgba(30, 30, 30, 0.95);
    --dark-border: #333333;
    --dark-secondary-bg: rgba(255, 255, 255, 0.05);
    --accent-dot-dark: #ffa07a;
    
    /* Common Variables */
    --transition-speed: 0.3s;
    --max-width: 1200px;
    --border-radius: 8px;
    
    /* Default Theme (Light) */
    --bg-color: var(--light-bg);
    --text-color: var(--light-text);
    --accent-color: var(--light-accent);
    --accent-hover: var(--light-accent-hover);
    --card-bg: var(--light-card-bg);
    --card-shadow: var(--light-card-shadow);
    --navbar-bg: var(--light-navbar-bg);
    --border-color: var(--light-border);
    --secondary-bg: var(--light-secondary-bg);
    --accent-dot: var(--accent-dot-light);
}

/* Dark Theme */
.dark-theme {
    --bg-color: var(--dark-bg);
    --text-color: var(--dark-text);
    --accent-color: var(--dark-accent);
    --accent-hover: var(--dark-accent-hover);
    --card-bg: var(--dark-card-bg);
    --card-shadow: var(--dark-card-shadow);
    --navbar-bg: var(--dark-navbar-bg);
    --border-color: var(--dark-border);
    --secondary-bg: var(--dark-secondary-bg);
    --accent-dot: var(--accent-dot-dark);
}

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

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--text-color);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.25rem;
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50%;
    height: 3px;
    background-color: var(--accent-color);
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

a:hover {
    color: var(--accent-hover);
}

img {
    max-width: 100%;
    height: auto;
}

input, textarea {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

::placeholder {
    color: var(--text-color);
    opacity: 0.6;
}

button {
    cursor: pointer;
}

/* Layout */
.section {
    padding: 4rem 1rem;
    max-width: var(--max-width);
    margin: 0 auto;
    background-color: var(--bg-color);
}

.section:nth-child(even) {
    background-color: var(--secondary-bg);
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--navbar-bg);
    padding: 1rem 2rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px var(--card-shadow);
    transition: all var(--transition-speed);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

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

.nav-links li {
    margin-left: 2rem;
}

.nav-links a {
    color: var(--text-color);
    font-weight: 500;
    position: relative;
}

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

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

#theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 1.2rem;
    transition: color var(--transition-speed);
    margin-left: 1.5rem;
}

#theme-toggle:hover {
    color: var(--accent-color);
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 2px 0;
    transition: all var(--transition-speed);
}

/* Hero Section */
.hero-section {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(-45deg, #1a1a2e, #16213e, #0f3460, #533483, #1a1a2e);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    color: #ffffff;
    padding: 0 1rem;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(100, 181, 246, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(255, 99, 71, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 40% 20%, rgba(138, 43, 226, 0.1) 0%, transparent 50%);
    animation: floatingCircles 20s ease-in-out infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes floatingCircles {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(30px, -30px); }
    66% { transform: translate(-20px, 20px); }
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 1;
}

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

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    animation: fadeInDown 1s ease;
    color: #ffffff;
}

.hero-content p {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease 0.2s;
    animation-fill-mode: both;
}

.cta-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: #ffffff;
    padding: 0.75rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: background-color var(--transition-speed);
    animation: fadeInUp 1s ease 0.4s;
    animation-fill-mode: both;
}

.cta-button:hover {
    background-color: var(--accent-hover);
    color: #ffffff;
}

/* About Section */
.about-content {
    display: flex;
    align-items: center;
    gap: 3rem;
}

.about-image {
    flex: 1;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 1/1;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px var(--card-shadow);
    background-image: url('https://images.unsplash.com/photo-1573497019940-1c28c88b4f3e');
    background-size: cover;
    background-position: center;
}

.about-text {
    flex: 2;
}

/* Achievements Section */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.achievement-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 10px var(--card-shadow);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.achievement-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--card-shadow);
}

.achievement-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

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

.achievement-card h4 {
    color: var(--accent-color);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.achievement-card p {
    color: var(--text-color);
    opacity: 0.8;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Experience Section */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 20%;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    display: flex;
}

.timeline-date {
    width: 20%;
    padding-right: 2rem;
    text-align: right;
    font-weight: 600;
    color: var(--accent-color);
}

.timeline-content {
    width: 80%;
    padding-left: 2rem;
    position: relative;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: 0 4px 10px var(--card-shadow);
}

.timeline-content::before {
    content: '';
    position: absolute;
    left: -9px;
    top: 20px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--accent-color);
}

.timeline-content h3 {
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    margin-bottom: 1rem;
    color: var(--accent-color);
    font-weight: normal;
}

/* Projects Section */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 10px var(--card-shadow);
    overflow: hidden;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--card-shadow);
}

.project-image {
    height: 200px;
    background-color: var(--accent-color);
    background-size: cover;
    background-position: center;
}

.project-card:nth-child(1) .project-image {
    background-image: url('https://images.unsplash.com/photo-1568952433726-3896e3881c65');
}

.project-card:nth-child(2) .project-image {
    background-image: url('https://images.unsplash.com/photo-1534452203293-494d7ddbf7e0');
}

.project-card:nth-child(3) .project-image {
    background-image: url('https://images.unsplash.com/photo-1507238691740-187a5b1d37b8');
}

.project-card h3 {
    padding: 1.5rem 1.5rem 0.5rem;
}

.project-card p {
    padding: 0 1.5rem;
    color: var(--text-color);
    opacity: 0.8;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
}

.tech-tags span {
    background-color: var(--secondary-bg);
    color: var(--accent-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
}

.project-links {
    display: flex;
    justify-content: space-between;
    padding: 1rem 1.5rem 1.5rem;
    border-top: 1px solid var(--border-color);
    margin-top: 1rem;
}

/* Skills Section */
.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
}

.skills-category h3 {
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skills-tags span {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    transition: all var(--transition-speed);
}

.skills-tags span:hover {
    background-color: var(--accent-color);
    color: white;
    transform: translateY(-2px);
}

/* Resume Section */
.resume-section {
    display: flex;
    gap: 3rem;
    align-items: center;
    max-width: 1000px;
    margin: 0 auto;
}

.resume-content {
    flex: 1;
}

.resume-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.resume-preview {
    flex: 1;
}

.resume-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: 0 8px 30px var(--card-shadow);
    border: 2px solid var(--border-color);
}

.resume-header {
    text-align: center;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.resume-header i {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.resume-header h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.resume-header p {
    color: var(--accent-color);
    font-size: 0.9rem;
}

.resume-highlights {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background-color: var(--secondary-bg);
    border-radius: var(--border-radius);
}

.highlight-item i {
    color: var(--accent-color);
    font-size: 1.25rem;
}

.highlight-item span {
    font-size: 0.9rem;
    color: var(--text-color);
}

/* Contact Section */
.contact-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-text {
    margin-bottom: 2rem;
}

.contact-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 10px var(--card-shadow);
    transition: all var(--transition-speed);
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--card-shadow);
    background-color: var(--accent-color);
    color: white;
}

.contact-item i {
    margin-right: 0.75rem;
    font-size: 1.2rem;
}

/* Filter buttons */
.filter-btn {
    background-color: var(--secondary-bg);
    color: var(--text-color);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    transition: all var(--transition-speed);
}

.filter-btn.active {
    background-color: var(--accent-color);
    color: white;
}

/* Footer */
footer {
    background-color: var(--card-bg);
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

/* Chat Widget */
.chat-widget {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
}

#chat-toggle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--accent-color);
    color: white;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 15px var(--card-shadow);
    transition: all var(--transition-speed);
    display: flex;
    justify-content: center;
    align-items: center;
}

#chat-toggle:hover {
    background-color: var(--accent-hover);
    transform: scale(1.05);
}

.chat-modal {
    position: absolute;
    bottom: 80px;
    right: 0;
    width: 350px;
    height: 450px;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 5px 25px var(--card-shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    display: none;
    border: 1px solid var(--border-color);
}

.chat-header {
    padding: 1rem;
    background-color: var(--accent-color);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.chat-header h3 {
    margin: 0;
    color: white;
}

#close-chat {
    background: none;
    border: none;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
}

/* Suggested Questions */
.suggested-questions {
    padding: 1rem;
    background-color: var(--secondary-bg);
    border-bottom: 1px solid var(--border-color);
}

.suggestions-title {
    font-size: 0.85rem;
    color: var(--text-color);
    opacity: 0.7;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.suggestion-btn {
    display: block;
    width: 100%;
    text-align: left;
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.5rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-color);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.suggestion-btn:hover {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateX(5px);
}

.suggestion-btn:last-child {
    margin-bottom: 0;
}

/* Chat Controls */
.chat-controls {
    padding: 0.5rem 1rem;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
}

.clear-chat-btn {
    background: none;
    border: none;
    color: var(--text-color);
    opacity: 0.6;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.clear-chat-btn:hover {
    opacity: 1;
    background-color: var(--secondary-bg);
}

.clear-chat-btn i {
    font-size: 0.9rem;
}

.chat-messages {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-message {
    max-width: 80%;
    padding: 0.75rem 1rem;
    border-radius: 1rem;
    animation: fadeIn 0.3s;
    display: flex;
}

.chat-message.user {
    align-self: flex-end;
}

.chat-message.bot {
    align-self: flex-start;
}

.message-content {
    padding: 8px 12px;
    border-radius: 15px;
    word-wrap: break-word;
    line-height: 1.4;
}

.chat-message.user .message-content {
    background-color: var(--accent-color);
    color: white;
    border-bottom-right-radius: 3px;
}

.chat-message.bot .message-content {
    background-color: var(--secondary-bg);
    color: var(--text-color);
    border-bottom-left-radius: 3px;
}

/* Typing Indicator */
.chat-message.typing .message-content {
    padding: 10px 12px;
}

.chat-message.typing span {
    display: inline-block;
    width: 8px;
    height: 8px;
    background-color: currentColor;
    border-radius: 50%;
    margin: 0 1px;
    opacity: 0.7;
    animation: typing-blink 1.4s infinite both;
}

.chat-message.typing span:nth-child(2) {
    animation-delay: 0.2s;
}

.chat-message.typing span:nth-child(3) {
    animation-delay: 0.4s;
}

.chat-input {
    display: flex;
    border-top: 1px solid var(--border-color);
    padding: 0.75rem;
}

.chat-input input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius) 0 0 var(--border-radius);
    background-color: var(--bg-color);
    color: var(--text-color);
}

.chat-input button {
    padding: 0 1rem;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    cursor: pointer;
    transition: background-color var(--transition-speed);
}

.chat-input button:hover {
    background-color: var(--accent-hover);
}

#send-message:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes typing-blink {
    0%, 80%, 100% { opacity: 0.3; }
    40% { opacity: 1; }
}

/* Media Queries */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    /* Achievements responsive */
    .achievements-grid {
        grid-template-columns: 1fr;
    }

    /* Resume section responsive */
    .resume-section {
        flex-direction: column;
    }

    .resume-buttons {
        flex-direction: column;
    }

    .resume-highlights {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        height: 0;
        flex-direction: column;
        background-color: var(--navbar-bg);
        overflow: hidden;
        transition: height var(--transition-speed);
        box-shadow: 0 10px 10px var(--card-shadow);
    }
    
    .nav-links.active {
        height: auto;
        padding: 1rem 0;
    }
    
    .nav-links li {
        margin: 1rem 2rem;
    }
    
    .hamburger {
        display: flex;
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        flex-direction: column;
    }
    
    .timeline-date {
        width: 100%;
        text-align: left;
        padding-left: 60px;
        margin-bottom: 0.5rem;
    }
    
    .timeline-content {
        width: 100%;
        padding-left: 60px;
    }
    
    .timeline-content::before {
        left: 20px;
    }
    
    .project-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-container {
        grid-template-columns: 1fr;
    }
    
    .contact-links {
        flex-direction: column;
    }
    
    .chat-modal {
        width: calc(100vw - 4rem);
        height: 400px;
        right: 0;
        bottom: 80px;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 3rem 1rem;
    }
    
    .hero-content h1 {
        font-size: 2.25rem;
    }
    
    .hero-content p {
        font-size: 1.25rem;
    }
    
    .contact-item {
        width: 100%;
    }

    #chat-toggle {
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
}
.hidden {
  display: none;
}