/* Modern CSS Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Variables */
:root {
    /* Light theme (default) */
    --primary-color: #2d3748;
    --secondary-color: #4a5568;
    --accent-color: #2F9E44;  /* Medical green */
    --accent-hover: #2B8A3E;  /* Darker shade for hover states */
    --text-color: #2d3748;
    --light-text: #718096;
    --background: #ffffff;
    --light-background: #f7fafc;
    --border-color: #e2e8f0;
    --card-background: #ffffff;
    --transition: all 0.2s ease;
    --max-width: 1000px;
    --border-radius: 4px;
}

/* Dark theme */
[data-theme="dark"] {
    --primary-color: #E2E8F0;
    --secondary-color: #CBD5E0;
    --accent-color: #48BB78;
    --accent-hover: #38A169;
    --text-color: #E2E8F0;
    --light-text: #A0AEC0;
    --background: #1A202C;
    --light-background: #2D3748;
    --border-color: #4A5568;
    --card-background: #2D3748;
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

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

/* Base Styles */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--background);
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header & Navigation */
header {
    background: var(--background);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4rem;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
}

nav {
    display: flex;
    gap: 2rem;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    position: relative;
}

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

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

/* Hero Section */
.hero {
    padding: 8rem 0 4rem;
    background: var(--light-background);
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.hero h2 {
    font-size: 1.25rem;
    color: var(--light-text);
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--light-text);
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    margin: 0 0.5rem;
    font-size: 0.95rem;
}

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

.btn.primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

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

.btn.secondary:hover {
    background-color: var(--light-background);
    transform: translateY(-1px);
}

.btn.tertiary {
    background-color: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
}

.btn.tertiary:hover {
    background-color: var(--light-background);
    color: white;
    background-color: var(--accent-color);
    transform: translateY(-1px);
}

/* About Section */
.about {
    padding: 4rem 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
    align-items: start;
}

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

.skills-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.skill-category {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.skill-category h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

/* Experience Section */
.experience {
    padding: 4rem 0;
    background-color: var(--light-background);
}

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

.experience-card {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.experience-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.experience-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.role {
    font-weight: 500;
    color: var(--accent-color);
    margin-bottom: 0.25rem;
}

.duration {
    color: var(--light-text);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Education Section */
.education {
    padding: 4rem 0;
}

.education-card {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    margin-top: 2rem;
}

.education-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.degree {
    font-weight: 500;
    color: var(--accent-color);
    margin-bottom: 0.25rem;
}

/* Footer */
footer {
    background: var(--light-background);
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
}

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

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

.social-links a {
    color: var(--light-text);
    font-size: 1.25rem;
    transition: var(--transition);
}

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

/* Section Headers */
section h2 {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    .hero h1 {
        font-size: 2rem;
    }

    .hero h2 {
        font-size: 1.1rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    nav {
        gap: 1rem;
    }

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

    .btn {
        margin: 0;
        width: 100%;
        text-align: center;
    }
}

/* Smooth transition for theme changes */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Contact Page Styles */
.contact-hero {
    padding: 8rem 0 4rem;
    background: var(--light-background);
    text-align: center;
}

.contact-hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    margin-top: 2rem;
}

.info-card {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.info-item:last-child {
    margin-bottom: 0;
}

.info-item i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.info-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
    color: var(--primary-color);
}

.info-item a, .info-item p {
    color: var(--secondary-color);
    text-decoration: none;
    transition: var(--transition);
}

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

.contact-form {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

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

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background);
    color: var(--text-color);
    font-family: inherit;
    transition: var(--transition);
}

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

/* Chat Section Styles */
.chat {
    padding: 4rem 0;
    background: var(--light-background);
}

.chat-container {
    background: var(--card-background);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    overflow: hidden;
    max-width: 800px;
    margin: 0 auto;
}

.chat-messages {
    height: 400px;
    overflow-y: auto;
    padding: 1.5rem;
}

.message {
    margin-bottom: 1rem;
    max-width: 80%;
}

.message p {
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    margin: 0;
}

.message.system p {
    background: var(--light-background);
    color: var(--secondary-color);
}

.message.user {
    margin-left: auto;
}

.message.user p {
    background: var(--accent-color);
    color: white;
}

.message.assistant p {
    background: var(--light-background);
    color: var(--text-color);
}

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

.chat-form input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background);
    color: var(--text-color);
    font-family: inherit;
}

.chat-form input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.chat-form button {
    padding: 0.75rem 1.5rem;
}

/* Responsive Design for Contact and Chat */
@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .chat-messages {
        height: 300px;
    }
}

@media (max-width: 480px) {
    .chat-form {
        flex-direction: column;
    }

    .chat-form button {
        width: 100%;
    }
}

/* Projects Page Styles */
.projects-hero {
    padding: 6rem 0 3rem;
    text-align: center;
    background-color: var(--light-background);
}

.projects-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.projects-hero .subtitle {
    font-size: 1.2rem;
    color: var(--light-text);
    max-width: 600px;
    margin: 0 auto;
}

.projects-content {
    padding: 3rem 0;
}

.projects-filter {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 2rem;
    background: none;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    min-width: 100px;
}

.filter-btn:hover {
    background-color: var(--light-background);
}

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

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

.project-card {
    background-color: var(--card-background);
    border-radius: 1rem;
    overflow: hidden;
    transition: transform 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.project-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

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

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.project-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.project-description {
    color: var(--light-text);
    margin-bottom: 1.5rem;
    line-height: 1.6;
    flex-grow: 1;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-tech span {
    background-color: var(--light-background);
    color: var(--text-color);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
}

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

/* Responsive Design for Projects Page */
@media (max-width: 768px) {
    .projects-hero {
        padding: 5rem 0 2rem;
    }

    .projects-hero h1 {
        font-size: 2rem;
    }

    .projects-content {
        padding: 2rem 0;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .filter-btn {
        width: calc(50% - 0.5rem);
        min-width: 120px;
    }

    .project-card {
        max-width: 500px;
        margin: 0 auto;
    }
}

@media (max-width: 480px) {
    .projects-hero h1 {
        font-size: 1.75rem;
    }

    .projects-hero .subtitle {
        font-size: 1rem;
    }

    .filter-btn {
        width: 100%;
    }

    .project-links {
        flex-direction: column;
    }

    .project-links .btn {
        width: 100%;
        text-align: center;
    }
} 

/* Tutoring Page Styles */
.tutoring-main {
    padding: 6rem 0 2rem 0;
    max-width: 700px;
    margin: 0 auto;
}
.tutoring-title {
    font-size: 2.2rem;
    margin-bottom: 0.5em;
    color: var(--primary-color);
    font-weight: 700;
}
.tutoring-desc {
    font-size: 1.1rem;
    margin-bottom: 2em;
    color: var(--secondary-color);
}
.student-list {
    list-style: none;
    padding: 0;
}
.student-list li {
    margin-bottom: 1em;
}
.student-link {
    text-decoration: none;
    color: var(--accent-color);
    font-weight: 500;
    font-size: 1.1rem;
    transition: color 0.2s;
}
.student-link:hover {
    color: var(--accent-hover);
} 

/* Student Card Styles for Tutoring Page */
.student-card {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    background: var(--card-background);
    border: 1.5px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.07);
    padding: 1.1rem 1.5rem;
    text-decoration: none;
    transition: box-shadow 0.2s, border-color 0.2s, background 0.2s;
    margin-bottom: 0.5em;
    cursor: pointer;
    min-width: 0;
}
.student-card:hover {
    box-shadow: 0 4px 24px rgba(47,158,68,0.13);
    border-color: var(--accent-color);
    background: var(--light-background);
}
.student-card-img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 6px;
    background: var(--background);
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}
.student-card-text {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: 0.01em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
[data-theme="dark"] .student-card {
    box-shadow: 0 2px 12px rgba(72,187,120,0.07);
}
[data-theme="dark"] .student-card:hover {
    background: var(--background);
}

/* Project Placeholder Styles */
.project-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    background: var(--light-background);
    border-radius: var(--border-radius);
    border: 2px dashed var(--border-color);
    transition: var(--transition);
}

.project-card:hover .project-placeholder {
    border-color: var(--accent-color);
    background: var(--card-background);
}

/* Disabled Button Styles */
.btn.disabled {
    background: var(--border-color) !important;
    color: var(--light-text) !important;
    cursor: not-allowed !important;
    pointer-events: none;
    opacity: 0.6;
}

.btn.disabled:hover {
    transform: none !important;
    box-shadow: none !important;
} 