/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --text-color: #333;
    --light-bg: rgba(245, 245, 245, 0.95);
    --white: rgba(255, 255, 255, 0.95);
    --section-bg: rgba(255, 255, 255, 0.95);
    --card-bg: rgba(255, 255, 255, 0.98);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-image: url('images/prosthetics_bg.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    min-height: 100vh;
    padding-top: 120px;
}

/* Header and Navigation */
header {
    background-color: transparent !important;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    padding: 0;
    height: 120px;
}

nav {
    width: 100%;
    height: 120px;
    min-height: 120px;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-image: url('images/1700147900834.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
}

nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(44, 62, 80, 0.4);
    z-index: 0;
}

nav > * {
    color: #fff !important;
    position: relative;
    z-index: 1;
}

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

.nav-links {
    display: flex;
    list-style: none;
    margin-left: -2rem;
    justify-content: center;
    gap: 2rem;
}

.nav-links li {
    margin-left: 0;
}

.nav-links a, .logo {
    color: #fff !important;
}

.nav-links a {
    text-decoration: none;
    color: #fff;
    transition: color 0.3s ease, transform 0.3s cubic-bezier(0.4,0,0.2,1);
    font-size: 1.3rem;
    font-weight: 500;
    display: inline-block;
}

.nav-links a:hover {
    color: var(--secondary-color);
    transform: scale(1.15);
}

/* Mobile Menu */
.burger {
    display: none;
    cursor: pointer;
}

.burger div {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 5px;
    transition: all 0.3s ease;
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 120px;
        left: 0;
        right: 0;
        width: 100vw;
        margin-left: 0;
        padding-left: 0;
        background-image: url('images/photo-1576086213369-97a306d36557.jpg');
        background-size: cover;
        background-position: center;
        background-repeat: no-repeat;
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        z-index: 1001;
        box-shadow: -2px 0 5px rgba(0,0,0,0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
                    opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
                    visibility 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .nav-links::before {
        content: none;
    }
    .nav-links.nav-active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    .nav-links > * {
        position: relative;
        z-index: 1;
        color: #fff !important;
    }

    .burger {
        display: block;
        position: absolute;
        right: 2rem;
        top: 50%;
        transform: translateY(-50%);
        z-index: 1100;
    }

    .burger div {
        background-color: #fff !important;
    }

    .toggle .line1 {
        transform: rotate(-45deg) translate(-5px, 6px);
    }
    .toggle .line2 {
        opacity: 0;
    }
    .toggle .line3 {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .nav-links li {
        margin-left: 0 !important;
        width: auto;
        text-align: center;
    }
    .nav-links a {
        width: auto;
        text-align: center;
        display: block;
    }
}

/* Hero Section */
.hero {
    height: 100vh;
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.9), rgba(52, 152, 219, 0.9));
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    padding: 0 1rem;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: var(--white);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 5px;
    margin-top: 2rem;
    transition: transform 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-3px);
}

/* Sections */
section {
    padding: 2rem 1rem;
    background-color: transparent;
    margin: 1rem auto;
    max-width: 1200px;
    margin-top: 5rem;
}

section h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
    background-color: var(--section-bg);
    padding: 0.25rem 1rem;
    border-radius: 5px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    display: inline-block;
    margin-left: auto;
    margin-right: auto;
}

section.skills h2 {
    background-color: transparent;
    box-shadow: none;
    border-radius: 0;
    color: #fff;
    font-size: 2.5rem;
    font-weight: 900;
    text-shadow: 3px 3px 12px rgba(44,62,80,0.9), 0 2px 0 #000;
    padding: 0.5rem 2rem;
}

section.about h2,
section.projects h2,
section.outreach h2,
section.contact h2 {
    background-color: transparent;
    box-shadow: none;
    border-radius: 0;
    color: #fff;
    font-size: 2.5rem;
    font-weight: 900;
    text-shadow: 3px 3px 12px rgba(44,62,80,0.9), 0 2px 0 #000;
    padding: 0.5rem 2rem;
}

section.publications h2,
section.patents h2 {
    background-color: transparent;
    box-shadow: none;
    border-radius: 0;
    color: #fff;
    font-size: 2.5rem;
    font-weight: 900;
    text-shadow: 3px 3px 12px rgba(44,62,80,0.9), 0 2px 0 #000;
    padding: 0.5rem 2rem;
    text-align: center;
    margin-bottom: 1.5rem;
}

/* About Section */
.about {
    background-color: transparent;
    padding-top: 1rem;
    text-align: center;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: flex-start;
    gap: 2rem;
    background-color: var(--section-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.about-img {
    width: 300px;
    height: 300px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    flex-shrink: 0;
}

.about-content.centered {
    flex-direction: column;
    align-items: center;
    text-align: center;
    display: flex;
    gap: 2rem;
}

.about-content.centered .about-img {
    margin-bottom: 0;
}

.about-content.centered .about-text {
    max-width: 700px;
}

.about-text {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--text-color);
    text-shadow: 1px 1px 1px rgba(255,255,255,0.5);
}

.about-images {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.about-img-extra {
    width: 180px;
    height: 180px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

@media (max-width: 600px) {
    .about-images {
        flex-direction: column;
        gap: 1rem;
    }
    .about-img-extra {
        width: 100%;
        max-width: 250px;
        height: auto;
    }
}

.about-images-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.about-img-extra {
    width: 150px;
    height: 150px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.about-img {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

@media (max-width: 700px) {
    .about-images-row {
        flex-direction: column;
        gap: 1rem;
    }
    .about-img-extra, .about-img {
        width: 100%;
        max-width: 220px;
        height: auto;
    }
}

/* Projects Section */
.projects {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 50vh;
    background-color: transparent;
    padding-top: 1rem;
    text-align: center;
}

.project-pyramid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    background-color: var(--section-bg);
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.project-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    text-align: center;
    text-decoration: none;
    color: var(--text-color);
}

.project-card:hover {
    transform: translateY(-5px);
    background-color: var(--secondary-color);
    color: var(--white);
}

.project-card h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: bold;
    text-align: center;
}

@media (max-width: 700px) {
    .project-pyramid {
        grid-template-columns: 1fr;
    }
}

/* Skills Section */
.skills {
    background-color: transparent;
    padding-top: 1rem;
    text-align: center;
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    background-color: transparent;
    border-radius: 0;
    box-shadow: none;
}

.skill-category {
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    padding: 2rem;
    margin-bottom: 2rem;
}

.skill-category h3 {
    color: #000;
    margin-bottom: 1.5rem;
    font-size: 2rem;
    font-weight: bold;
    text-align: center;
    text-shadow: 2px 2px 8px rgba(44,62,80,0.7), 0 1px 0 #000;
}

.skill-category ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.skill-category li {
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    background-color: var(--card-bg);
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-shadow: 1px 1px 1px rgba(255,255,255,0.5);
}

@media (max-width: 900px) {
    .skills-container {
        grid-template-columns: 1fr;
    }
    
    .skill-category ul {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

/* Contact Section */
.contact {
    background-color: transparent;
    padding-top: 1rem;
    text-align: center;
}

.contact-container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--section-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-form input,
.contact-form textarea {
    padding: 1rem;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 5px;
    font-size: 1rem;
    background-color: var(--card-bg);
}

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

.submit-button {
    padding: 1rem;
    background-color: var(--secondary-color);
    color: var(--white);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.submit-button:hover {
    background-color: var(--primary-color);
}

.submit-button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
    transform: none;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
}

.social-links a {
    color: var(--primary-color);
    font-size: 1.5rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--secondary-color);
    transform: translateY(-3px);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background-color: rgba(44, 62, 80, 0.95);
    color: var(--white);
    margin-top: 2rem;
    text-shadow: 1px 1px 1px rgba(0,0,0,0.2);
}

/* Logo with image styles */
.logo-with-image {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: 50%;
    border: 2px solid var(--primary-color);
}

@media (max-width: 768px) {
    .about-content {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
    }
    .about-img {
        width: 150px;
        height: 150px;
    }
    .logo-img {
        width: 32px;
        height: 32px;
    }
}

.success-message {
    background-color: #4CAF50;
    color: white;
    padding: 1rem;
    border-radius: 5px;
    margin-top: 1rem;
    text-align: center;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Outreach Section */
.outreach {
    background-color: transparent;
    padding-top: 1rem;
    text-align: center;
}

.outreach-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    background-color: var(--section-bg);
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.outreach-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    text-align: center;
    text-decoration: none;
    color: var(--text-color);
}

.outreach-card:hover {
    transform: translateY(-5px);
    background-color: var(--secondary-color);
    color: var(--white);
}

.outreach-card h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: bold;
    text-align: center;
}

@media (max-width: 700px) {
    .outreach-grid {
        grid-template-columns: 1fr;
    }
}

/* Project and Outreach Detail Sections */
.project-detail,
.outreach-detail {
    max-width: 800px;
    margin: 100px auto 50px;
    padding: 2rem;
    text-align: center;
}

.project-detail h2,
.outreach-detail h2 {
    color: #fff;
    margin-bottom: 1.5rem;
    font-size: 2rem;
    font-weight: bold;
    text-align: center;
    text-shadow: 2px 2px 8px rgba(44,62,80,0.7), 0 1px 0 #000;
    background: transparent;
    box-shadow: none;
    border-radius: 0;
}

.project-detail p,
.outreach-detail p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    text-align: center;
    background: transparent;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
}

.download-links-container {
    text-align: center;
    margin: 2rem 0;
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.back-link {
    display: block;
    margin-top: 2rem;
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: bold;
    text-align: left;
}

.back-link:hover {
    text-decoration: underline;
}

.download-link {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: bold;
}

.download-link:hover {
    text-decoration: underline;
}

/* Publications Section */
.publications {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

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

.publication-card {
    background: #fff;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

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

.publication-card h3 {
    color: #333;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.publication-authors {
    color: #666;
    font-style: italic;
    margin-bottom: 0.5rem;
}

.publication-journal {
    color: #444;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.publication-year {
    color: #666;
    margin-bottom: 0.5rem;
}

.publication-doi {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.publication-link {
    display: inline-block;
    color: #007bff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.publication-link:hover {
    color: #0056b3;
    text-decoration: underline;
}

/* Patents Section */
.patents {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

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

.coming-soon {
    background: #fff;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.coming-soon h3 {
    color: #333;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.coming-soon p {
    color: #666;
    font-size: 1.1rem;
}

.patent-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    text-align: left;
    text-decoration: none;
    color: var(--text-color);
}

.patent-card:hover {
    transform: translateY(-5px);
    background-color: var(--secondary-color);
    color: var(--white);
}

.patent-card h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: bold;
}

.patent-card p {
    margin-bottom: 0.5rem;
    font-size: 1rem;
    line-height: 1.6;
}

.patent-card .inventors {
    font-style: italic;
    margin-bottom: 0.5rem;
}

.patent-card .patent-office {
    font-weight: 500;
}

.patent-card .year {
    color: var(--secondary-color);
    font-weight: 500;
}

.patent-card:hover h3,
.patent-card:hover p,
.patent-card:hover .inventors,
.patent-card:hover .patent-office,
.patent-card:hover .year {
    color: var(--white);
}

@media (max-width: 700px) {
    .patents-grid {
        grid-template-columns: 1fr;
    }
}

html, body {
    overflow-x: hidden;
}

/* Hero Section for Index Page */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4rem 5%;
    min-height: 70vh;
    background: var(--section-bg);
    backdrop-filter: blur(10px);
    margin: 2rem 5%;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.hero-content {
    flex: 1;
    padding-right: 2rem;
}

.hero-content h1 {
    font-size: 3.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.hero-content h2 {
    font-size: 1.8rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-weight: 400;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-color);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    display: inline-block;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: transparent;
    color: var(--secondary-color);
}

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

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

.hero-image {
    flex: 0 0 300px;
    text-align: center;
}

.profile-img {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid var(--secondary-color);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

/* Intro Summary Section */
.intro-summary {
    padding: 4rem 5%;
    background: var(--section-bg);
    backdrop-filter: blur(10px);
    margin: 2rem 5%;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.intro-summary h3 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.intro-summary > .container > p {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-color);
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.quick-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.quick-link-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    text-align: center;
}

.quick-link-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.quick-link-card i {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.quick-link-card h4 {
    margin-bottom: 1rem;
}

.quick-link-card h4 a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 1.3rem;
    font-weight: 600;
}

.quick-link-card h4 a:hover {
    color: var(--secondary-color);
}

.quick-link-card p {
    color: var(--text-color);
    line-height: 1.6;
}

/* Responsive Design for Index Page */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 2rem;
    }
    
    .hero-content {
        padding-right: 0;
        margin-bottom: 2rem;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-content h2 {
        font-size: 1.4rem;
    }
    
    .hero-image {
        flex: none;
    }
    
    .profile-img {
        width: 200px;
        height: 200px;
    }
    
    .intro-summary {
        padding: 2rem;
    }
    
    .intro-summary h3 {
        font-size: 2rem;
    }
    
    .quick-links {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .btn-primary, .btn-secondary {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
}