@charset "utf-8";

/* ===== ROOT VARIABLES ===== */
:root {
    --color-primary: #2c3e50;
    --color-secondary: #555;
    --color-text: #333;
    --color-text-light: #666;
    --color-bg: #ffffff;
    --color-bg-light: #f8f9fa;
    --color-bg-gray: #e9ecef;
    --color-border: #dee2e6;
    --color-accent: #3498db;
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-heading: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --transition: all 0.2s ease;
}

/* ===== BASE STYLES ===== */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--color-primary);
    margin-top: 0;
    line-height: 1.3;
}

h1 { font-size: 2.5rem; margin-bottom: 1rem; }
h2 { font-size: 2rem; margin-bottom: 0.875rem; }
h3 { font-size: 1.5rem; margin-bottom: 0.75rem; }
h4 { font-size: 1.25rem; margin-bottom: 0.625rem; }

p {
    margin-bottom: 1.25rem;
    color: var(--color-text-light);
}

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

a:hover {
    color: #2980b9;
}

/* ===== NAVIGATION ===== */
.my-navbar {
    background-color: var(--color-bg) !important;
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 0;
    font-size: 0.95rem;
    font-weight: 500;
}

.my-navbar .navbar-brand {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary) !important;
    padding: 0.5rem 0;
}

.my-navbar .nav-link {
    color: var(--color-text) !important;
    padding: 0.75rem 1.25rem !important;
    transition: var(--transition);
    border-radius: 4px;
    margin: 0 2px;
}

.my-navbar .nav-link:hover {
    color: var(--color-accent) !important;
    background-color: var(--color-bg-light);
}

.my-navbar .nav-item.active .nav-link,
.my-navbar .nav-link.active {
    color: var(--color-accent) !important;
    font-weight: 600;
}

.my-navbar .dropdown-menu {
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    border-radius: 6px;
    padding: 0.5rem 0;
    margin-top: 0.5rem;
}

.my-navbar .dropdown-item {
    padding: 0.5rem 1.25rem;
    color: var(--color-text);
    transition: var(--transition);
}

.my-navbar .dropdown-item:hover {
    background-color: var(--color-bg-light);
    color: var(--color-accent);
}

/* ===== HERO SECTION ===== */
.hero-section {
    background: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-bg) 100%);
    padding: 4rem 0;
    margin-bottom: 3rem;
}

.hero-section h1 {
    font-size: 2.75rem;
    margin-bottom: 0.5rem;
}

.hero-section .subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
}

.hero-section .affiliation {
    color: var(--color-secondary);
    font-size: 1rem;
}

/* ===== PROFILE IMAGE ===== */
.my-image {
    border-radius: 50%;
    display: block;
    margin: 0 auto;
    box-shadow: var(--shadow-md);
    border: 4px solid var(--color-bg);
    max-width: 220px;
    height: auto;
}

.profile-image-container {
    text-align: center;
    margin-bottom: 2rem;
}

/* ===== CONTENT SECTIONS ===== */
.content-section {
    padding: 3rem 0;
}

.section-title {
    font-size: 1.75rem;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--color-bg-gray);
}

.my-paragraph {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
}

/* ===== CARDS ===== */
.card {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    margin-bottom: 1.5rem;
    background: var(--color-bg);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    background-color: var(--color-bg-light);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.25rem;
    font-weight: 600;
}

.card-body {
    padding: 1.25rem;
}

/* ===== PUBLICATION LIST ===== */
.publication-item {
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--color-bg-gray);
}

.publication-item:last-child {
    border-bottom: none;
}

.publication-title {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.375rem;
    font-size: 1.0625rem;
}

.publication-authors {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    margin-bottom: 0.25rem;
}

.publication-venue {
    color: var(--color-secondary);
    font-style: italic;
    font-size: 0.9375rem;
}

.publication-year {
    display: inline-block;
    background-color: var(--color-bg-light);
    padding: 0.125rem 0.5rem;
    border-radius: 4px;
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-left: 0.5rem;
}

.publication-links {
    margin-top: 0.5rem;
}

.publication-links a {
    font-size: 0.875rem;
    margin-right: 1rem;
}


/* ===== PROJECT CARDS ===== */
.project-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.project-card:hover {
    box-shadow: var(--shadow-md);
}

.project-title {
    font-weight: 600;
    color: var(--color-primary);
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

.project-status {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
}

.project-status.active {
    background-color: #d4edda;
    color: #155724;
}

.project-status.completed {
    background-color: var(--color-bg-gray);
    color: var(--color-secondary);
}

/* ===== CONTACT ===== */
.contact-info {
    background: var(--color-bg-light);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1.25rem;
}

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

.contact-icon {
    width: 24px;
    margin-right: 1rem;
    color: var(--color-accent);
    text-align: center;
}

.contact-details h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.contact-details p {
    margin-bottom: 0;
    color: var(--color-text-light);
}

.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-link {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text);
    font-size: 0.9375rem;
    transition: var(--transition);
}

.social-link:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.social-link i {
    margin-right: 0.5rem;
}

/* ===== FOOTER ===== */
.my-footer {
    background-color: var(--color-primary);
    color: rgba(255,255,255,0.9);
    padding: 3rem 0 2rem;
    margin-top: 4rem;
}

.my-footer h5 {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.my-footer p,
.my-footer a {
    color: rgba(255,255,255,0.8);
    font-size: 0.9375rem;
}

.my-footer a:hover {
    color: #fff;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    display: inline-flex;
    align-items: center;
}

.footer-links i {
    width: 20px;
    margin-right: 0.5rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 1.5rem;
    margin-top: 2rem;
    text-align: center;
    font-size: 0.875rem;
    color: rgba(255,255,255,0.6);
}

/* ===== ACCORDION STYLES ===== */
.accordion .card {
    border: 1px solid var(--color-border);
    border-radius: 8px !important;
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.accordion .card-header {
    background-color: var(--color-bg-light);
    border-bottom: none;
    padding: 0;
    border-radius: 8px !important;
}

.accordion .card-header h4 {
    margin-bottom: 0;
}

.accordion .card-header .btn-link {
    width: 100%;
    text-align: left;
    padding: 1rem 1.25rem;
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.accordion .card-header .btn-link:hover {
    background-color: var(--color-bg-gray);
    text-decoration: none;
}

.accordion .card-header .btn-link:focus {
    box-shadow: none;
}

.accordion .card-header .btn-link i {
    transition: transform 0.3s ease;
    color: var(--color-accent);
}

.accordion .card-header .btn-link:not(.collapsed) i {
    transform: rotate(180deg);
}

.accordion .card-body {
    padding: 1.25rem;
    background-color: var(--color-bg);
}

.accordion .card-body p {
    margin-bottom: 1rem;
    font-size: 0.9375rem;
    line-height: 1.7;
}

.accordion .card-body p:last-child {
    margin-bottom: 0;
}

/* Course-specific accordion styling */
.accordion .course-code {
    font-weight: 600;
    color: var(--color-accent);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    display: block;
}

/* ===== HIGHLIGHT BOX ===== */
.highlight-box {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.highlight-box h4 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

/* ===== PAGE HEADER ===== */
.page-header {
    background: var(--color-bg-light);
    padding: 2.5rem 0;
    margin-bottom: 2.5rem;
    border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
    margin-bottom: 0.5rem;
}

.page-header .lead {
    color: var(--color-text-light);
    font-size: 1.125rem;
    margin-bottom: 0;
}

/* ===== UTILITIES ===== */
.text-muted {
    color: var(--color-text-light) !important;
}

.bg-light {
    background-color: var(--color-bg-light) !important;
}

.mt-section {
    margin-top: 3rem;
}

.mb-section {
    margin-bottom: 3rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 991px) {
    .my-navbar .nav-link {
        padding: 0.5rem 0.75rem !important;
    }

    .hero-section {
        padding: 2.5rem 0;
    }

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

@media (max-width: 767px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }

    .hero-section {
        text-align: center;
    }

    .my-image {
        max-width: 180px;
        margin-bottom: 1.5rem;
    }

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

    .my-footer {
        text-align: center;
    }

    .footer-links {
        margin-bottom: 1.5rem;
    }
}

/* ===== WRAPPER FOR STICKY FOOTER ===== */
.my-wrap {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.my-wrap main {
    flex: 1;
}