/* Minimalist Portfolio Stylesheet - Sidebar Layout */

:root {
    --primary-color: #2563eb;
    --text-color: #1f2937;
    --text-muted: #6b7280;
    --bg-color: #ffffff;
    --sidebar-bg: #f8fafc;
    --border-color: #e5e7eb;
    --section-bg: #f9fafb;
    --sidebar-width: 240px;
}

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

/* Page Loader */
#page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.4s ease;
}

#page-loader.hidden {
    opacity: 0;
    pointer-events: none;
}

#page-loader img {
    width: 80px;
    height: 80px;
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-color);
}

/* Layout: Sidebar + Main Content */
.layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    padding: 30px 20px;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-profile {
    text-align: center;
    margin-bottom: 30px;
}

.sidebar-photo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 15px;
}

.sidebar-name {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.sidebar-title {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* Navigation */
nav ul {
    list-style: none;
    margin-bottom: 30px;
}

nav li {
    margin-bottom: 8px;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 8px 12px;
    display: block;
    border-radius: 6px;
    transition: background 0.2s, color 0.2s;
}

nav a:hover,
nav a.active {
    background: var(--primary-color);
    color: white;
    text-decoration: none;
}

/* Social Links in Sidebar */
.sidebar-social {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.sidebar-social a {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-decoration: none;
}

.sidebar-social a:hover {
    color: var(--primary-color);
}

/* Main Content */
main {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 40px 50px;
    max-width: 800px;
}

/* Sections */
section {
    margin-bottom: 50px;
}

h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

h2 {
    font-size: 1.4rem;
    color: var(--text-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 8px;
    margin-bottom: 20px;
}

h3 {
    font-size: 1.1rem;
    color: var(--text-color);
    margin-bottom: 5px;
}

p {
    margin-bottom: 15px;
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Experience Items */
.experience-item {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

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

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 8px;
}

.experience-title {
    font-weight: 600;
    color: var(--text-color);
}

.experience-company {
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.company-logo {
    width: 20px;
    height: 20px;
    object-fit: contain;
}

.experience-date {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.experience-item ul {
    margin-left: 20px;
    margin-top: 10px;
}

.experience-item li {
    margin-bottom: 5px;
    color: var(--text-color);
    font-size: 0.95rem;
}

.experience-item p {
    color: var(--text-color);
    font-size: 0.95rem;
    margin-top: 10px;
}

/* Publications */
.publication-item {
    margin-bottom: 20px;
    padding-left: 15px;
    border-left: 3px solid var(--primary-color);
}

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

.publication-venue {
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 5px;
}

.publication-authors {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 5px;
}

.publication-doi {
    font-size: 0.9rem;
    margin-bottom: 5px;
}

/* Skills */
.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
}

.skills-list li {
    background: var(--section-bg);
    padding: 5px 12px;
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Photo Gallery */
.photo-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.photo-gallery img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s;
}

.photo-gallery img:hover {
    transform: scale(1.02);
}

/* Articles List */
.article-item {
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

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

.article-title {
    font-weight: 600;
    margin-bottom: 5px;
}

.article-excerpt {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Connect List */
.connect-list div {
    margin-bottom: 8px;
}

/* Footer */
footer {
    margin-top: 50px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 1000;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
}

/* Responsive - Tablet & Mobile */
@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 999;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    main {
        margin-left: 0;
        padding: 80px 25px 40px;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .experience-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .photo-gallery {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

@media (max-width: 500px) {
    main {
        padding: 70px 15px 30px;
    }

    h1 {
        font-size: 1.6rem;
    }

    h2 {
        font-size: 1.2rem;
    }

    .sidebar-photo {
        width: 100px;
        height: 100px;
    }
}