:root {
    --primary-color: #333;
    --accent-color: #e32636; /* Using a red similar to XiaoHongShu/Pinterest branding hints or general bold color */
    --text-color: #444;
    --bg-color: #f9f9f9;
    --card-bg: #ffffff;
    --placeholder-color: #888;
    --placeholder-bg: #f0f0f0;
}

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

body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow: hidden; /* We will control scrolling */
}

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

a:hover {
    text-decoration: underline;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 220px;
    height: 100vh;
    background-color: #fff;
    border-right: 1px solid #eee;
    z-index: 200;
    padding: 20px 0;
    box-shadow: 2px 0 5px rgba(0,0,0,0.02);
    overflow-y: auto;
}

.sidebar-header {
    padding: 0 20px 15px 20px;
    border-bottom: 1px solid #f0f0f0;
    margin-bottom: 10px;
}

.sidebar-header h3 {
    color: var(--primary-color);
    font-size: 1.2em;
}

.sidebar ul {
    list-style: none;
    padding: 0;
}

.sidebar li {
    padding: 10px 20px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9em;
    color: #666;
    border-left: 3px solid transparent;
}

.sidebar li:hover {
    background-color: #fafafa;
    color: var(--primary-color);
}

.sidebar li.active {
    background-color: #fff5f5;
    color: var(--accent-color);
    border-left-color: var(--accent-color);
    font-weight: 600;
}

/* Container */
.presentation-container {
    margin-left: 220px;
    width: calc(100% - 220px);
    height: 100vh;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
    position: relative;
}

/* Navigation Buttons */
.nav-controls {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.nav-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background-color: rgba(0,0,0,0.5);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s;
}

.nav-btn:hover {
    background-color: var(--accent-color);
}

/* Slides */
.slide {
    height: 100vh;
    width: 100%;
    scroll-snap-align: start;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
    opacity: 0.5;
    transition: opacity 0.5s ease-in-out;
}

.slide.active { /* JS can toggle this for effects, but scroll snap handles position */
    opacity: 1;
}

/* Focus effect when in view (using IntersectionObserver in JS later for class toggle) */
.slide.in-view {
    opacity: 1;
}

.content-wrapper {
    background: var(--card-bg);
    width: 100%;
    max-width: 1000px;
    max-height: 90vh;
    padding: 40px 60px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    overflow-y: auto; /* Allow internal scrolling if content is too long */
}

/* Slide Specific Styles */

/* Header Slide */
#slide-intro h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    color: var(--primary-color);
}

#slide-intro h2 {
    font-size: 1.5em;
    color: var(--text-color);
    margin-bottom: 20px;
    border-bottom: none; /* Removed underline */
    display: inline-block;
    padding-bottom: 5px;
}

.basic-info p {
    margin-bottom: 8px;
    font-size: 1.1em;
}

.basic-info i {
    width: 20px;
    text-align: center;
    margin-right: 5px;
    color: var(--accent-color);
}

/* Section Headers */
.section-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 5px; /* Reduced from 20px */
    border-bottom: none;
    padding-bottom: 5px; /* Reduced from 10px */
}

.section-header h3 {
    font-size: 1.8em;
    color: var(--primary-color);
    border-bottom: none !important;
    margin-bottom: 0;
    padding-bottom: 0;
}

.company-tag {
    background-color: var(--accent-color);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: bold;
}

/* Project Headers */
.project-header {
    margin-bottom: 20px;
}

.project-header h3 {
    font-size: 1.6em;
    margin-bottom: 5px;
}

.role-badge {
    background-color: #eef;
    color: #44a;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    margin-right: 10px;
}

.role-tag {
    background-color: #eee;
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 0.8em;
    margin-left: 5px;
}

.date {
    color: #666;
    font-weight: 500;
    float: right;
}

/* Details */
.detail-block {
    margin-bottom: 20px;
}

.detail-block h5 {
    font-size: 1.1em;
    margin-bottom: 8px;
    color: var(--primary-color);
    border-left: 3px solid var(--accent-color);
    padding-left: 10px;
}

.detail-block p {
    margin-bottom: 10px;
    text-align: justify;
}

.detail-block ul {
    list-style-type: disc;
    padding-left: 20px;
}

.detail-block li {
    margin-bottom: 5px;
}

/* Skills List */
.skills-list li {
    margin-bottom: 10px;
    line-height: 1.6;
}

/* Internships */
.internship-item {
    margin-bottom: 25px;
}

.internship-item.compact {
    margin-bottom: 15px;
}

.internship-header h4 {
    font-size: 1.2em;
    margin-bottom: 5px;
}

.compact .internship-header h4 {
    font-size: 1.1em;
    margin-bottom: 2px;
}

.compact p {
    font-size: 0.95em;
    margin-bottom: 0;
}

.sub-text {
    font-weight: normal;
    font-size: 0.9em;
    color: #666;
    margin-left: 5px;
}

.compact-list li {
    margin-bottom: 8px;
    font-size: 0.95em;
    line-height: 1.5;
}

/* Education & Split Layout */
.split-layout {
    display: flex;
    gap: 40px;
}

.left-panel, .right-panel {
    flex: 1;
}

.left-panel h3, .right-panel h3 {
    border-bottom: 1px solid #ccc;
    padding-bottom: 10px;
    margin-bottom: 10px; /* Reduced from 15px */
    margin-top: 0; /* Ensure no top margin */
}

.project-list li {
    margin-bottom: 12px; /* Increased from 6px */
    font-size: 1.1em; /* Match left panel font size */
}

.edu-item {
    margin-bottom: 20px;
}

.edu-header {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 5px;
    font-weight: bold;
}

/* Edit Placeholder */
.edit-placeholder {
    margin-top: 30px;
    border: 2px dashed #ddd;
    background-color: var(--placeholder-bg);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    color: var(--placeholder-color);
    transition: all 0.3s;
}

.edit-placeholder:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    cursor: text;
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        width: 50px;
        overflow: hidden;
    }
    
    .sidebar:hover {
        width: 220px;
        box-shadow: 5px 0 15px rgba(0,0,0,0.1);
    }
    
    .sidebar-header {
        display: none; /* Hide header in collapsed mode */
    }
    
    .sidebar:hover .sidebar-header {
        display: block;
    }

    .sidebar li {
        white-space: nowrap;
        padding: 15px 10px;
        text-align: center;
        font-size: 0.8em;
    }

    .sidebar:hover li {
        text-align: left;
        padding: 10px 20px;
        font-size: 0.9em;
    }

    .presentation-container {
        margin-left: 50px;
        width: calc(100% - 50px);
    }
}

@media (max-width: 768px) {
    .content-wrapper {
        padding: 20px;
        max-height: 95vh;
    }
    
    .slide {
        padding: 10px;
    }

    .split-layout {
        flex-direction: column;
        gap: 20px;
    }

    .date {
        float: none;
        display: block;
        margin-top: 5px;
    }
    
    #slide-intro h1 {
        font-size: 2em;
    }
}