:root {
    --bg-body: #f0f2f5;
    --bg-content: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #666;
    --accent-color: #007bff;
    --border-color: #e4e6eb;
    --nav-bg: #ffffff;
    --nav-text: #1a1a1a;
    --header-height: 60px;
}

[data-theme="dark"] {
    --bg-body: #121212;
    --bg-content: #1e1e1e;
    --text-primary: #e4e6eb;
    --text-secondary: #b0b3b8;
    --accent-color: #4da3ff;
    --border-color: #3e4042;
    --nav-bg: #242526;
    --nav-text: #e4e6eb;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: transparent; /* Let background container show */
    color: var(--text-primary);
    line-height: 1.6;
    transition: color 0.3s ease;
    min-height: 100vh;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    text-decoration: underline;
}

/* Background Animation Placeholder */
.background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    transition: background 0.5s ease;
}

[data-theme="light"] .background-container {
    /* fallback or default if JS fails */
    background: #f0f2f5; 
}

[data-theme="dark"] .background-container {
   /* fallback or default if JS fails */
   background: #121212;
}

/* Top Bar */
.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--nav-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    z-index: 1000;
}

.profile-info {
    display: flex;
    align-items: center;
    font-weight: 600;
    font-size: 1.1rem;
}

.divider {
    margin: 0 10px;
    color: var(--text-secondary);
}

.age {
    color: var(--text-secondary);
    font-size: 0.9em;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.lang-switch {
    display: flex;
    background-color: rgba(128, 128, 128, 0.1);
    padding: 3px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.lang-switch a {
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 16px;
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    margin: 0 1px;
}

.lang-switch a:hover {
    color: var(--text-primary);
    background-color: rgba(128, 128, 128, 0.05);
}

.lang-switch a.active {
    background-color: var(--bg-content);
    color: var(--accent-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    font-weight: 600;
}

.control-btn, .theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    transition: background-color 0.2s;
    line-height: 1;
}

.control-btn:hover, .theme-toggle:hover {
    background-color: var(--border-color);
}

/* Background Handling */
.background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    transition: background 0.5s ease;
}

/* Image Mode - Handled in index.html for WebP support */

/* Gradient Mode */
html[data-theme="light"] body[data-bg-mode="gradient"] .background-container {
    background: linear-gradient(to bottom, #87CEEB 0%, #E0F7FA 100%);
}

html[data-theme="dark"] body[data-bg-mode="gradient"] .background-container {
    background: linear-gradient(to bottom, #0f2027, #203a43, #2c5364);
}
.main-content {
    max-width: 900px;
    margin: calc(var(--header-height) + 2rem) auto 2rem;
    padding: 0 1rem;
}

/* Navigation */
.main-nav {
    margin-bottom: 2rem;
    background-color: var(--bg-content);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.main-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.main-nav a {
    color: var(--text-primary);
    font-weight: 500;
}

.main-nav a:hover {
    color: var(--accent-color);
    text-decoration: none;
}

/* Sections */
.content-section {
    background-color: var(--bg-content);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.content-section h2 {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.subsection-title {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
}

/* Job & Projects */
.job-item, .project-item {
    margin-bottom: 2rem;
}

.job-item h3, .project-item h4 {
    margin-bottom: 0.25rem;
}

.date {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

ul {
    padding-left: 1.2rem;
    margin-top: 0.5rem;
}

li {
    margin-bottom: 0.25rem;
}

/* Apps Grid */
.apps-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 600px) {
    .apps-container {
        grid-template-columns: 1fr;
    }
    
    .top-bar {
        padding: 0 1rem;
    }
}

.app-column h3 {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Blog List */
.blog-list li {
    margin-bottom: 0.75rem;
}

/* Tech Grid */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.tech-category h3 {
    font-size: 1rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

/* Contact */
.contact-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.contact-btn {
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    background-color: var(--bg-body);
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.contact-btn:hover {
    background-color: var(--border-color);
    text-decoration: none;
}

.main-footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 2rem;
    padding-bottom: 2rem;
}