/* ===== SINGLE UNIFIED CSS FOR ALL PAGES ===== */

/* CSS VARIABLES */
:root {
    --primary-color: #022851;
    --secondary-color: #FFBF00;
    --accent-color: #8FA8C5;
    --text-color: #333;
    --light-bg: #f9f9f9;
    --white: #ffffff;
    --green-accent: #4CAF50;
    --blue-accent: #3498db;
    --red-accent: #e74c3c;
}

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

html {
    height: 100%;
    scrollbar-gutter: auto;
}

body {
    height: 100%;
    font-family: 'Open Sans', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--light-bg);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Override Tailwind container when it loads */
header .container,
main .container,
section .container,
footer .container,
.page-content .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== HEADER & NAVIGATION (IDENTICAL FOR ALL PAGES) ===== */
header {
    background-color: var(--primary-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    position: relative;
    min-height: 72px;
}

.logo {
    font-family: 'Lora', serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
    display: flex;
    align-items: center;
    min-width: 200px; /* Fixed width to prevent shifting */
}

.logo img {
    height: 30px;
    width: 30px; /* Fixed width */
    margin-right: 10px;
    flex-shrink: 0; /* Prevent shrinking */
}

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

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.3s;
    position: relative;
}

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

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

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

/* Mobile menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    cursor: pointer;
    padding: 8px;
    position: relative;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
}

.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
}

.hamburger span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--white);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.mobile-menu-btn:hover .hamburger span {
    background-color: var(--secondary-color);
}

.mobile-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    min-width: 200px;
    z-index: 1001;
    margin-top: 10px;
    overflow: hidden;
}

.mobile-dropdown.active {
    display: block;
    animation: slideDown 0.3s ease-out;
}

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

.mobile-dropdown a {
    display: block;
    padding: 15px 20px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid #f0f0f0;
    transition: background-color 0.3s;
}

.mobile-dropdown a:last-child {
    border-bottom: none;
}

.mobile-dropdown a:hover {
    background-color: var(--light-bg);
    color: var(--primary-color);
}

/* ===== MAIN CONTENT LAYOUT ===== */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.page-content {
    flex: 1;
    padding-top: 100px;
    padding-bottom: 60px;
}

/* Helper class for pages without .page-content */
.offset-main {
    padding-top: 100px;
}

.page-title {
    font-family: 'Lora', serif;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 40px;
    text-align: center;
    position: relative;
    padding-bottom: 15px;
    font-weight: 700;
}

.page-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--secondary-color);
}

.intro-text {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px;
    color: #666;
    font-size: 1.1rem;
}

/* ===== HOME PAGE STYLES ===== */
.hero {
    flex: 1;
    padding-top: 100px;
    padding-bottom: 60px;
    background: linear-gradient(135deg, var(--white) 0%, var(--light-bg) 100%);
    display: flex;
    align-items: center;
    min-height: calc(100vh - 80px);
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 50px;
    width: 100%;
}

.profile-image {
    flex-shrink: 0;
    position: relative;
}

.profile-circle {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    overflow: hidden;
    border: 5px solid var(--white);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.profile-circle:hover {
    transform: scale(1.03);
}

.profile-circle img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-accent {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 2px dashed var(--primary-color);
    top: -10px;
    left: 10px;
    z-index: -1;
}

.hero-text {
    flex: 1;
}

.hero-text h1 {
    font-family: 'Lora', serif;
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.hero-text h2 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.hero-text p {
    margin-bottom: 25px;
    font-size: 1.05rem;
    line-height: 1.7;
}

.social-links {
    margin-top: 30px;
}

.social-links h3 {
    font-family: 'Lora', serif;
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.social-icons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.social-icon {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    background-color: var(--white);
    border-radius: 50px;
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
    transition: all 0.3s;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}

.social-icon:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.social-icon i {
    margin-right: 8px;
    font-size: 1.2rem;
}

.contact-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 12px 25px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    margin-top: 10px;
    transition: all 0.3s;
}

.contact-btn:hover {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.academic-highlight {
    background-color: rgba(255, 191, 0, 0.1);
    padding: 2px 5px;
    border-radius: 3px;
    font-weight: 500;
}

/* ===== ABOUT PAGE STYLES ===== */
.section {
    margin-bottom: 40px;
    background-color: var(--white);
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.section-title {
    font-family: 'Lora', serif;
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--secondary-color);
    display: flex;
    align-items: center;
}

.section-title i {
    margin-right: 12px;
    color: var(--secondary-color);
}

.education-item {
    margin-bottom: 25px;
    padding-left: 20px;
    border-left: 3px solid var(--accent-color);
}

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

.degree {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.institution {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-color);
    margin-bottom: 5px;
}

.period {
    font-style: italic;
    color: var(--accent-color);
    margin-bottom: 5px;
}

.achievement {
    margin-bottom: 5px;
    color: var(--text-color);
}

.thesis {
    font-style: italic;
    color: var(--text-color);
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.skill-category {
    margin-bottom: 20px;
}

.skill-category-title {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.skill-category-title i {
    margin-right: 10px;
    color: var(--secondary-color);
}

.skill-list {
    list-style: none;
    padding-left: 25px;
}

.skill-list li {
    margin-bottom: 5px;
    position: relative;
}

.skill-list li::before {
    content: '•';
    position: absolute;
    left: -15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--secondary-color);
}

.research-list, .teaching-list, .leadership-list, .awards-list, .work-list, .publication-list, .mentee-list, .media-list {
    list-style: none;
}

.research-item, .teaching-item, .leadership-item, .award-item, .work-item {
    margin-bottom: 15px;
    padding-left: 25px;
    position: relative;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.research-item::before, .teaching-item::before, .leadership-item::before, .award-item::before, .work-item::before {
    content: '•';
    position: absolute;
    left: 5px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--secondary-color);
    font-size: 1.5rem;
    line-height: 1;
}

.item-content {
    flex: 1;
    min-width: 0;
    padding-right: 10px;
}

.item-period {
    flex-shrink: 0;
    color: var(--accent-color);
    font-style: italic;
    text-align: right;
    min-width: 100px;
}

.publication-item, .mentee-item, .media-item {
    margin-bottom: 20px;
    padding-left: 25px;
    position: relative;
}

.publication-item::before, .mentee-item::before, .media-item::before {
    content: '•';
    position: absolute;
    left: 5px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--secondary-color);
    font-size: 1.5rem;
    line-height: 1;
}

.publication-title, .mentee-title, .media-title {
    font-weight: 600;
    margin-bottom: 5px;
}

.publication-authors, .mentee-authors {
    font-style: italic;
    margin-bottom: 3px;
    font-size: 0.95rem;
}

.publication-venue, .mentee-venue, .media-venue {
    color: var(--accent-color);
    font-size: 0.9rem;
}

.publication-link, .mentee-link, .media-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
    margin-top: 3px;
}

.publication-link:hover, .mentee-link:hover, .media-link:hover {
    text-decoration: underline;
    color: var(--secondary-color);
}

/* ===== TEACHING PAGE STYLES ===== */
.course-card {
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.course-card:hover {
    transform: translateY(-8px);
    text-decoration: none;
    color: inherit;
}

.iot-course {
    background: linear-gradient(135deg, #022851 0%, #1e3a5f 50%, #3a5998 100%);
    color: white !important;
}

.iot-course:hover {
    box-shadow: 0 20px 40px rgba(2, 40, 81, 0.3);
    color: white !important;
}

.iot-course * {
    color: white !important;
}

.stats-course {
    background: linear-gradient(135deg, #FFBF00 0%, #FFD700 50%, #FFA500 100%);
}

.stats-course:hover {
    box-shadow: 0 20px 40px rgba(255, 191, 0, 0.3);
}

.iot-icon {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.stats-animation {
    animation: bounce 1.5s ease-in-out infinite alternate;
}

@keyframes bounce {
    0% { transform: translateY(0px); }
    100% { transform: translateY(-10px); }
}

/* ===== COMING SOON STYLES ===== */
.coming-soon {
    text-align: center;
    padding: 80px 20px;
    max-width: 600px;
    margin: 0 auto;
}

.coming-soon-icon {
    font-size: 4rem;
    color: var(--accent-color);
    margin-bottom: 30px;
}

.coming-soon h2 {
    font-family: 'Lora', serif;
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.coming-soon p {
    color: #666;
    font-size: 1.1rem;
    line-height: 1.6;
}

/* ===== FOOTER (IDENTICAL FOR ALL PAGES) ===== */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 20px 0;
    text-align: center;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.footer-logo {
    font-family: 'Lora', serif;
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.footer-text {
    font-size: 0.9rem;
    opacity: 0.8;
}

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

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.8s ease-out forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

.hero-text h1, .hero-text h2, .hero-text p, .contact-btn, .social-links, .profile-image {
    animation: fadeIn 0.8s ease-out forwards;
}

.profile-image { animation-delay: 0.1s; }
.hero-text h1 { animation-delay: 0.2s; }
.hero-text h2 { animation-delay: 0.4s; }
.hero-text p { animation-delay: 0.6s; }
.contact-btn { animation-delay: 0.7s; }
.social-links { animation-delay: 0.8s; }

.section {
    animation: fadeIn 0.8s ease-out forwards;
}

.section:nth-child(1) { animation-delay: 0.1s; }
.section:nth-child(2) { animation-delay: 0.2s; }
.section:nth-child(3) { animation-delay: 0.3s; }
.section:nth-child(4) { animation-delay: 0.4s; }
.section:nth-child(5) { animation-delay: 0.5s; }
.section:nth-child(6) { animation-delay: 0.6s; }
.section:nth-child(7) { animation-delay: 0.7s; }
.section:nth-child(8) { animation-delay: 0.8s; }
.section:nth-child(9) { animation-delay: 0.9s; }
.section:nth-child(10) { animation-delay: 1.0s; }
.section:nth-child(11) { animation-delay: 1.1s; }

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 900px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }
    
    .social-icons {
        justify-content: center;
    }
    
    .hero {
        min-height: auto;
        padding-top: 120px;
    }
    
    .skills-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-dropdown {
        right: 0;
        left: auto;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .logo {
        font-size: 1.3rem;
    }
    
    .logo img {
        height: 25px;
        width: 25px;
    }
    
    .hero {
        padding-top: 100px;
        padding-bottom: 40px;
    }
    
    .profile-circle {
        width: 220px;
        height: 220px;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .research-item, .teaching-item, .leadership-item, .award-item, .work-item {
        flex-direction: column;
    }

    .item-period {
        text-align: left;
        margin-top: 5px;
    }
}

@media (max-width: 480px) {
    .container,
    header .container,
    main .container,
    section .container,
    footer .container,
    .page-content .container {
        padding: 0 15px;
    }
    
    .page-title {
        font-size: 1.8rem;
    }
    
    .logo {
        font-size: 1.1rem;
        min-width: 150px;
    }
    
    .mobile-dropdown {
        min-width: 180px;
        right: -10px;
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .hero-text h2 {
        font-size: 1.1rem;
    }
    
    .profile-circle {
        width: 180px;
        height: 180px;
    }
    
    .social-icon {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    
    .hero-content {
        gap: 30px;
    }
    
    .section {
        padding: 20px;
    }
}