/* Color Variables for Light/Dark Mode */
:root {
    --accent: #23314a;
    --bg-color: #ffffff;
    --text-primary: #111111;
    --text-secondary: #555555; 
    --nav-bg: rgba(255, 255, 255, 0.95);
    --modal-bg: #ffffff;
    --card-bg: #f8f9fa;
    --card-shadow: rgba(0,0,0,0.05);
    --tag-bg: var(--accent); 
    --tag-text: #ffffff;
    --edu-bg: rgba(255, 255, 255, 0.15); 
    --edu-text: #ffffff;
    --overlay: rgba(0, 0, 0, 0.65);
}

body.dark-mode {
    --accent: #e0e0e0;
    --bg-color: #1a1a1d;
    --text-primary: #f0f0f0;
    --text-secondary: #cccccc;
    --nav-bg: rgba(26, 26, 29, 0.95);
    --modal-bg: #2d2d30;
    --card-bg: #2d2d30;
    --card-shadow: rgba(0,0,0,0.2);
    --tag-bg: var(--accent);
    --tag-text: #111111;
    --edu-bg: rgba(255, 255, 255, 0.1); 
    --edu-text: #ffffff;
    --overlay: rgba(0, 0, 0, 0.75);
}

html { 
    scroll-behavior: smooth; 
}

* { 
    box-sizing: border-box; 
}

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

/* Navigation Bar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 4rem;
    position: sticky;
    top: 0;
    background-color: var(--nav-bg);
    backdrop-filter: blur(10px);
    z-index: 1001;
}

.nav-left, .nav-center, .nav-right { 
    display: flex; 
    align-items: center; 
}

.nav-left { 
    flex: 1; 
}

.nav-center { 
    flex: 1; 
    justify-content: center; 
    gap: 2.5rem; 
}

.nav-right { 
    flex: 1; 
    justify-content: flex-end; 
    gap: 1.5rem; 
}

.nav-title { 
    font-weight: 800; 
    font-size: 1.2rem; 
    letter-spacing: 0.5px; 
    text-decoration: none; 
    color: var(--text-primary); 
    transition: color 0.2s; 
}

.nav-title:hover { 
    color: #888; 
}

.nav-link { 
    text-decoration: none; 
    color: var(--text-primary); 
    font-weight: 600; 
    font-size: 0.95rem; 
    letter-spacing: 0.5px; 
    transition: color 0.2s; 
}

.nav-link:hover { 
    color: #888; 
}

.icon-btn { 
    background: none; 
    border: none; 
    color: var(--text-primary); 
    font-size: 1.4rem; 
    cursor: pointer; 
    transition: color 0.2s; 
    padding: 0; 
}

.social-icon { 
    text-decoration: none; 
    display: inline-flex; 
    align-items: center; 
}

.icon-btn:hover, .social-icon:hover { 
    color: #888; 
}

/* Contact Modal */
.modal-overlay {
    display: none; 
    position: fixed; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%;
    background-color: var(--overlay); 
    z-index: 2000; 
    justify-content: center;
    align-items: center; 
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--modal-bg); 
    padding: 3rem; 
    border-radius: 20px;
    text-align: center; 
    position: relative; 
    max-width: 400px; 
    width: 90%;
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

.close-btn { 
    position: absolute; 
    top: 1.5rem; 
    right: 1.5rem; 
    background: none; 
    border: none; 
    font-size: 1.5rem; 
    color: var(--text-secondary); 
    cursor: pointer; 
}

.email-link { 
    display: inline-block; 
    font-size: 1.2rem; 
    font-weight: 700; 
    color: var(--text-primary); 
    margin: 1rem 0; 
    word-break: break-all; 
}

.reply-text { 
    color: var(--text-secondary); 
    font-size: 0.95rem; 
}

/* Hero Section */
.hero {
    position: relative; 
    overflow: hidden; 
    display: flex; 
    align-items: center;
    justify-content: center; 
    min-height: 90vh; 
    margin-bottom: 6rem; 
    padding: 4rem 2rem;
}

.video-container { 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    z-index: 0; 
}

.bg-video { 
    width: 100%; 
    height: 100%; 
    object-fit: cover; 
}

.video-overlay { 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    background: var(--overlay); 
    z-index: 1; 
}

.hero-content {
    position: relative; 
    z-index: 2; 
    display: flex; 
    align-items: center;
    justify-content: center; 
    gap: 5rem; 
    max-width: 1200px; 
    width: 100%;
}

.hero-left { 
    flex: 1; 
    display: flex; 
    flex-direction: column; 
    align-items: flex-end; 
    gap: 1.5rem; 
}

.hero-image { 
    width: 100%; 
    display: flex; 
    justify-content: flex-end; 
}

.hero-image img { 
    width: 100%; 
    max-width: 480px; 
    border-radius: 40px; 
    object-fit: cover; 
    box-shadow: 0 15px 40px rgba(0,0,0,0.4); 
    min-height: 480px; 
    background-color: var(--card-bg); 
}

/* Education Box */
.education-box {
    width: 100%; 
    max-width: 480px; 
    background-color: rgba(255, 255, 255, 0.15);
    -webkit-backdrop-filter: blur(16px); 
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.4); 
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    border-radius: 20px; 
    padding: 1.5rem; 
    display: flex; 
    flex-direction: column;
    align-items: center; 
    text-align: center; 
    color: var(--edu-text); 
    gap: 0.3rem; 
    transition: background-color 0.3s;
}

.edu-label { 
    font-size: 0.85rem; 
    font-weight: 700; 
    text-transform: uppercase; 
    letter-spacing: 1px; 
    opacity: 0.8; 
    margin-bottom: 0.2rem; 
}

.edu-text { 
    font-size: 1.05rem; 
    font-weight: 500; 
}

.edu-highlight { 
    font-size: 1.2rem; 
    font-weight: 800; 
    margin-top: 0.5rem; 
}

/* Right Column (Bio) */
.hero-text { 
    flex: 1; 
    text-align: left; 
    padding-right: 2rem; 
}

.hero-title { 
    color: #ffffff; 
    font-size: 3rem; 
    font-weight: 900; 
    line-height: 1.2; 
    margin-bottom: 1.5rem; 
    letter-spacing: -1.5px; 
}

.hero-bio { 
    color: #f0f0f0; 
    font-size: 1.05rem; 
    line-height: 1.7; 
    margin-bottom: 1.5rem; 
    padding: 0; 
}

.hero-bio-scrolldown { 
    color: #cccccc; 
    font-size: 0.95rem; 
    padding: 0; 
}

/* Hero Buttons */
.hero-buttons {
    display: flex;
    flex-direction: row; 
    gap: 1.5rem;
    align-items: stretch; 
    justify-content: flex-start;
    margin-top: 2.5rem;
    width: 100%;
}

.btn {
    display: flex; 
    align-items: center; 
    justify-content: center; 
    background-color: rgba(255, 255, 255, 0.15);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    color: #ffffff;
    text-decoration: none;
    padding: 0.9rem 1.5rem; 
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 1px;
    text-align: center;
    transition: all 0.3s ease;
    text-transform: uppercase;
    width: auto; 
    flex: 1; 
    max-width: 250px; 
}

.btn:hover { 
    background-color: rgba(255, 255, 255, 0.25); 
    border-color: rgba(255, 255, 255, 0.7); 
    transform: scale(1.02); 
}

/* Sections */
.content-section { 
    max-width: 1200px; 
    margin: 0 auto 6rem auto; 
    padding: 0 2rem; 
    scroll-margin-top: 100px; 
}

.section-title { 
    font-size: 2.5rem; 
    font-weight: 900; 
    margin-bottom: 3.5rem; 
    text-align: center; 
    letter-spacing: -1px; 
}

/* Grids */
.card-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); 
    gap: 2.5rem; 
    align-items: stretch; 
}

.project-grid { 
    display: grid; 
    grid-template-columns: repeat(2, 1fr); 
    gap: 2.5rem; 
    align-items: stretch; 
}

/* Cards */
.project-card-link { 
    text-decoration: none; 
    color: inherit; 
    display: block; 
    height: 100%; 
    transition: transform 0.2s; 
}

.project-card-link:hover { 
    transform: translateY(-5px); 
}

.project-card {
    background-color: var(--card-bg); 
    border-radius: 20px; 
    padding: 2.5rem; 
    display: flex;
    flex-direction: column; 
    height: 100%; 
    box-shadow: var(--card-shadow); 
    transition: background-color 0.3s, color 0.3s; 
    text-align: left;
}

.project-card h3 { 
    font-size: 1.5rem; 
    margin: 0 0 0.6rem 0; 
    font-weight: 800; 
    letter-spacing: -0.5px; 
}

.project-card p { 
    color: var(--text-secondary); 
    margin: 0 0 1.2rem 0; 
    font-size: 1rem; 
    line-height: 1.6; 
    flex-grow: 1; 
}

.tags { 
    display: flex; 
    flex-wrap: wrap; 
    gap: 0.6rem; 
    margin-bottom: 1.5rem; 
}

.tag { 
    background-color: var(--tag-bg); 
    color: var(--tag-text); 
    padding: 0.4rem 0.9rem; 
    border-radius: 8px; 
    font-size: 0.8rem; 
    font-weight: 700; 
    transition: background-color 0.3s, color 0.3s; 
    text-transform: uppercase; 
    letter-spacing: 0.5px; 
}

.card-image { 
    width: 100%; 
    height: 220px; 
    border-radius: 12px; 
    overflow: hidden; 
    margin-top: auto; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    background-color: var(--bg-color); 
}

.card-image img { 
    width: 100%; 
    height: 100%; 
    object-fit: cover; 
}

.placeholder-image { 
    color: var(--text-secondary); 
    font-size: 0.9rem; 
    border: 2px dashed var(--tag-bg); 
    background: none; 
}

.cert-card { 
    transition: transform 0.2s, background-color 0.3s, color 0.3s; 
    padding: 1.5rem; 
}

.cert-card:hover { 
    transform: translateY(-5px); 
}

.cert-card h3 { 
    font-size: 1.1rem; 
}

.cert-card p { 
    font-size: 0.9rem; 
}

.cert-image { 
    margin-top: 0; 
    margin-bottom: 1.5rem; 
    padding: 10px; 
    height: 200px; 
}

.cert-image img { 
    object-fit: contain; 
}

/* Mobile Responsiveness */
@media (max-width: 950px) {
    .navbar { 
        padding: 1rem 2rem; 
    }
    
    .nav-left, .nav-right { 
        width: auto; 
    }
    
    .nav-title { 
        display: none; 
    }
    
    .hero { 
        flex-direction: column; 
        gap: 3rem; 
        margin-top: 2rem; 
    }
    
    .hero-image { 
        justify-content: center; 
    }
    
    .hero-content { 
        gap: 3rem; 
    }
    
    .hero-text { 
        text-align: center; 
        padding-right: 0; 
    }
    
    .hero-bio { 
        padding: 0; 
    }
    
    .hero-buttons { 
        flex-direction: column; 
        justify-content: center; 
        width: 100%; 
    }
    
    .btn { 
        max-width: 100%; 
        width: 100%; 
    }
    
    .hero-left { 
        align-items: center; 
    }
    
    .education-box { 
        text-align: center; 
    }
    
    .project-grid { 
        grid-template-columns: 1fr; 
    }
}