/* General & Theming */
:root {
    --primary-color: #007BFF;
    --primary-hover-color: #0056b3;
    --background-color: #f9f9f9;
    --card-background-color: #ffffff;
    --text-color: #333;
    --border-color: #e0e0e0;
    --header-background-color: #ffffff;
    --footer-background-color: #333;
    --footer-text-color: #f9f9f9;
    --skill-background-color: #e9f5ff;
    --toggle-icon-color: #333;
}

html[data-theme="dark"] {
    --primary-color: #009cff;
    --primary-hover-color: #4dbbff;
    --background-color: #121212;
    --card-background-color: #1e1e1e;
    --text-color: #e0e0e0;
    --border-color: #333;
    --header-background-color: #1e1e1e;
    --footer-background-color: #1e1e1e;
    --footer-text-color: #e0e0e0;
    --skill-background-color: #2a3a4a;
    --toggle-icon-color: #e0e0e0;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.container {
    width: 80%;
    max-width: 960px;
    margin: 0 auto;
    padding: 20px 0;
}

/* Theme Toggle Button */
#theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-background-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s, border-color 0.3s, transform 0.2s;
}
#theme-toggle:hover {
    transform: scale(1.1);
}
#theme-toggle svg {
    color: var(--toggle-icon-color);
    transition: color 0.3s;
}
/* By default, show moon icon (for light mode) */
#theme-toggle .sun-icon {
    display: none;
}
#theme-toggle .moon-icon {
    display: block;
}
/* When in dark mode, show sun icon */
html[data-theme="dark"] #theme-toggle .sun-icon {
    display: block;
}
html[data-theme="dark"] #theme-toggle .moon-icon {
    display: none;
}


/* Header */
header {
    background-color: var(--header-background-color);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
    transition: background-color 0.3s, border-color 0.3s;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
    font-weight: 700;
}

header nav {
    margin-top: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

header nav a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
    margin: 0 10px;
}

header nav a:hover {
    color: var(--primary-hover-color);
}


/* Main Content */
main {
    padding: 20px 0;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

/* Experience Section */
.experience-card {
    background: var(--card-background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: background-color 0.3s, border-color 0.3s;
}

.experience-card h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.experience-date {
    font-style: italic;
    color: #888;
}

.experience-card ul {
    padding-left: 20px;
    margin: 0;
}

.experience-card ul li {
    margin-bottom: 10px;
}


/* Projects Section */
#projects .project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.project-card {
    background: var(--card-background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s, background-color 0.3s, border-color 0.3s;
    display: flex;
    flex-direction: column;
}


.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.project-card h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.project-card p {
    flex-grow: 1; 
}

.project-tags {
    margin-top: 15px;
    margin-bottom: 15px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    background-color: var(--skill-background-color);
    color: var(--primary-color);
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    transition: background-color 0.3s, color 0.3s;
}


.project-card a {
    display: inline-block;
    margin-top: auto; 
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
}

/* Skills Section */
#skills ul {
    list-style-type: none;
    padding: 0;
}

#skills li {
    background-color: var(--skill-background-color);
    padding: 10px 15px;
    margin-bottom: 8px;
    border-radius: 5px;
    border-left: 4px solid var(--primary-color);
    transition: background-color 0.3s, border-color 0.3s;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
    background-color: var(--footer-background-color);
    color: var(--footer-text-color);
    transition: background-color 0.3s, color 0.3s;
}

/* Fade-in Animation */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}