:root {
    /* DEFAULT TO DARK MODE */
    --primary: #3DA5ED;
    --text-dark: #F5F5F5;
    --text-light: #A0A5B0;
    --bg-light: #1A1A1A;
    --bg-white: #121212;
    --border-color: #2A2A2A;
    
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Roboto', sans-serif;
    
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.light-mode {
    --primary: #0170B9;
    --text-dark: #3a3a3a;
    --text-light: #4B4F58;
    --bg-light: #F5F5F5;
    --bg-white: #FFFFFF;
    --border-color: #E5E5E5;
}

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

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-dark);
    font-weight: 700;
}

h1 { font-size: 2.5rem; line-height: 1.2; margin-bottom: 0.5rem; }
h2 { font-size: 2rem; margin-bottom: 2rem; }
h4 { font-size: 1.25rem; margin-bottom: 1rem; }
h6 { font-size: 1.1rem; color: var(--text-light); font-weight: 400; margin-bottom: 1rem; }

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

a:hover {
    color: var(--text-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Base Sections */
section {
    padding: 60px 0;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-light);
    color: var(--text-dark);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    transition: var(--transition);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.theme-toggle:hover {
    transform: scale(1.1);
    border-color: var(--primary);
    color: var(--primary);
}

.sun-icon { display: block; }
.moon-icon { display: none; }

.light-mode .sun-icon { display: none; }
.light-mode .moon-icon { display: block; }

/* Animations (Scroll effects via JS) */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* Hero Section */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 30px;
    padding-top: 80px;
    padding-bottom: 60px;
}

.hero-image img {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.hero-image img:hover {
    transform: scale(1.05);
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: 30px;
}

.projects-grid {
    grid-template-columns: 1fr;
}

.interests-grid {
    grid-template-columns: 1fr;
    margin-bottom: 40px;
}

/* Cards */
.card {
    display: flex;
    flex-direction: column;
    background: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    color: var(--text-dark);
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 25px rgba(0,0,0,0.1);
    border-color: var(--primary);
    color: var(--primary);
}

.card h4 {
    padding: 20px 20px 10px;
    margin: 0;
    transition: color 0.3s;
}

.card-image-wrapper {
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    position: relative;
    overflow: hidden;
    background: var(--bg-light);
}

.card-image-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain; /* Maintain image full view without cropping */
    transition: transform 0.5s;
}

.card:hover .card-image-wrapper img {
    transform: scale(1.03);
}

.empty-card {
    justify-content: center;
    align-items: center;
    padding: 40px;
    background-color: var(--bg-light);
    border: 2px dashed var(--border-color);
    box-shadow: none;
}
.empty-card:hover { border-color: var(--primary); }

/* Video Wrappers */
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.interest-item h4, .interest-photography h4 {
    margin-bottom: 20px;
}

/* Photography Grid */
.photo-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.photo-grid img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: var(--transition);
}

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

/* Contact Section */
.contact {
    text-align: center;
    padding-bottom: 80px;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 20px;
}

.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--bg-light);
    color: var(--text-dark);
    transition: var(--transition);
}

.social-icon:hover {
    background-color: var(--primary);
    color: var(--bg-white);
    transform: translateY(-5px);
}


/* Tablet and Desktop Layouts (Mobile First Approach) */
@media (min-width: 768px) {
    .hero {
        flex-direction: row;
        text-align: left;
        justify-content: space-between;
        align-items: center;
        padding-top: 100px;
    }
    
    .hero-content {
        flex: 1;
        padding-right: 40px;
    }
    
    h1 { font-size: 3.5rem; }
    h6 { font-size: 1.3rem; }
    
    .hero-image img {
        width: 300px;
        height: 300px;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .interests-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .photo-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1024px) {
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}