/* ===================================
   Root Variables
   =================================== */
:root {
    --primary: #667eea;
    --primary-dark: #764ba2;
    --accent: #00d4ff;
    --accent-glow: #00ff88;
    --bg: #0a0e27;
    --bg-secondary: #151a3a;
    --text: #e0e6ff;
    --text-secondary: #a0aec0;
    --border: #2d3748;
    --card-bg: #1a1f3a;
}

body.light-mode {
    --bg: #ffffff;
    --bg-secondary: #f7f9fc;
    --text: #1a202c;
    --text-secondary: #4a5568;
    --border: #cbd5e0;
    --card-bg: #f5f7fa;
}

/* ===================================
   General Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

.wide-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.hero-container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    align-items: center;
    width: 100%;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 20px rgba(0, 212, 255, 0.3);
    border-bottom: 2px solid var(--accent);
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: white;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-menu a:hover {
    color: var(--accent);
    text-shadow: 0 0 10px var(--accent);
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid white;
    color: white;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background: white;
    color: var(--primary);
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.5);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 100px 40px;
    text-align: center;
    min-height: 600px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.circuit-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        /* Vertical lines */
        linear-gradient(90deg, 
            transparent 0%,
            transparent 8%,
            rgba(0, 212, 255, 0.6) 8.5%,
            rgba(0, 212, 255, 0.6) 9.5%,
            transparent 10%,
            transparent 18%,
            rgba(0, 212, 255, 0.6) 18.5%,
            rgba(0, 212, 255, 0.6) 19.5%,
            transparent 20%,
            transparent 28%,
            rgba(0, 212, 255, 0.6) 28.5%,
            rgba(0, 212, 255, 0.6) 29.5%,
            transparent 30%,
            transparent 38%,
            rgba(0, 212, 255, 0.6) 38.5%,
            rgba(0, 212, 255, 0.6) 39.5%,
            transparent 40%,
            transparent 48%,
            rgba(0, 212, 255, 0.6) 48.5%,
            rgba(0, 212, 255, 0.6) 49.5%,
            transparent 50%,
            transparent 58%,
            rgba(0, 212, 255, 0.6) 58.5%,
            rgba(0, 212, 255, 0.6) 59.5%,
            transparent 60%,
            transparent 68%,
            rgba(0, 212, 255, 0.6) 68.5%,
            rgba(0, 212, 255, 0.6) 69.5%,
            transparent 70%,
            transparent 78%,
            rgba(0, 212, 255, 0.6) 78.5%,
            rgba(0, 212, 255, 0.6) 79.5%,
            transparent 80%,
            transparent 88%,
            rgba(0, 212, 255, 0.6) 88.5%,
            rgba(0, 212, 255, 0.6) 89.5%,
            transparent 90%
        ),
        /* Horizontal lines */
        linear-gradient(0deg, 
            transparent 0%,
            transparent 8%,
            rgba(0, 255, 136, 0.5) 8.5%,
            rgba(0, 255, 136, 0.5) 9.5%,
            transparent 10%,
            transparent 18%,
            rgba(0, 255, 136, 0.5) 18.5%,
            rgba(0, 255, 136, 0.5) 19.5%,
            transparent 20%,
            transparent 28%,
            rgba(0, 255, 136, 0.5) 28.5%,
            rgba(0, 255, 136, 0.5) 29.5%,
            transparent 30%,
            transparent 38%,
            rgba(0, 255, 136, 0.5) 38.5%,
            rgba(0, 255, 136, 0.5) 39.5%,
            transparent 40%,
            transparent 48%,
            rgba(0, 255, 136, 0.5) 48.5%,
            rgba(0, 255, 136, 0.5) 49.5%,
            transparent 50%,
            transparent 58%,
            rgba(0, 255, 136, 0.5) 58.5%,
            rgba(0, 255, 136, 0.5) 59.5%,
            transparent 60%,
            transparent 68%,
            rgba(0, 255, 136, 0.5) 68.5%,
            rgba(0, 255, 136, 0.5) 69.5%,
            transparent 70%,
            transparent 78%,
            rgba(0, 255, 136, 0.5) 78.5%,
            rgba(0, 255, 136, 0.5) 79.5%,
            transparent 80%,
            transparent 88%,
            rgba(0, 255, 136, 0.5) 88.5%,
            rgba(0, 255, 136, 0.5) 89.5%,
            transparent 90%
        );
    background-size: 100% 100px, 100px 100%;
    background-position: 0 0, 0 0;
    animation: circuitPulse 4s ease-in-out infinite;
    filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.5));
}

@keyframes circuitPulse {
    0%, 100% { 
        filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.5));
        opacity: 0.7;
    }
    50% { 
        filter: drop-shadow(0 0 25px rgba(0, 255, 136, 0.8));
        opacity: 1;
    }
}

.hero-content {
    width: 100%;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 0.5rem;
    font-weight: bold;
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.6);
    letter-spacing: 2px;
}

.hero-quote {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    font-style: italic;
    color: var(--accent);
}

.hero-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
    position: relative;
}

.btn-primary {
    background-color: white;
    color: var(--primary);
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.8), 0 5px 15px rgba(0, 0, 0, 0.2);
    background: linear-gradient(135deg, var(--accent), var(--accent-glow));
    color: #000;
}

.link-btn {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid var(--accent);
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.4);
}

.link-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 0 20px var(--accent), 0 5px 15px rgba(102, 126, 234, 0.4);
    color: var(--accent-glow);
}

/* ===================================
   About Section
   =================================== */
.about {
    padding: 80px 40px;
    background-color: var(--bg-secondary);
}

.about h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--accent);
    text-align: center;
    text-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
}

.about-content {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
    max-width: 1100px;
    margin: 0 auto;
}

.about-image {
    width: 180px;
    height: 180px;
    border-radius: 10px;
    object-fit: cover;
    border: 3px solid var(--accent);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.4);
    flex-shrink: 0;
}

.about p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text);
}

/* ===================================
   Projects Section
   =================================== */
.projects {
    padding: 80px 40px;
    background-color: var(--bg);
}

.projects h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--accent);
    text-align: center;
    text-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
    transition: all 0.3s ease;
    border: 2px solid var(--border);
    border-left: 5px solid var(--accent);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.6), 0 10px 25px rgba(0, 0, 0, 0.3);
    border-left: 5px solid var(--accent-glow);
}

.project-card h3 {
    color: var(--accent);
    font-size: 1.3rem;
    margin-bottom: 1rem;
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

.project-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ===================================
   Skills Section
   =================================== */
.skills {
    padding: 80px 40px;
    background-color: var(--bg-secondary);
}

.skills h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--accent);
    text-align: center;
    text-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
    border: 2px solid var(--accent);
}

body.light-mode .skill-category {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.skill-category h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
    padding-bottom: 0.5rem;
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
}

.skill-category li:before {
    content: "✓";
    margin-right: 0.75rem;
    font-weight: bold;
    opacity: 0.8;
    color: var(--accent-glow);
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    padding: 80px 40px;
    background-color: var(--bg);
    text-align: center;
}

.contact h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--accent);
    text-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
}

.contact-info {
    font-size: 1.1rem;
    line-height: 2;
    max-width: 600px;
    margin: 0 auto;
}

.contact-info a {
    color: var(--accent);
    font-weight: 600;
    transition: all 0.3s ease;
    text-shadow: 0 0 5px rgba(0, 212, 255, 0.3);
}

.contact-info a:hover {
    color: var(--accent-glow);
    text-shadow: 0 0 15px var(--accent);
    text-decoration: underline;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
    border-top: 2px solid var(--accent);
    box-shadow: 0 -2px 20px rgba(0, 212, 255, 0.2);
}

.footer p {
    margin: 0;
    opacity: 0.9;
}

/* ===================================
   PDF Modal
   =================================== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    padding: 20px;
    overflow: auto;
}

.modal-content {
    background-color: var(--card-bg);
    margin: 40px auto;
    padding: 20px;
    border-radius: 10px;
    width: 90%;
    max-width: 900px;
    height: 80vh;
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.5);
    border: 2px solid var(--accent);
}

.close {
    color: var(--accent);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.close:hover {
    color: var(--accent-glow);
    text-shadow: 0 0 15px var(--accent);
}

#pdfFrame {
    border: none;
    border-radius: 5px;
    max-height: calc(80vh - 80px);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-quote {
        font-size: 1rem;
    }

    .nav-menu {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .nav-right {
        gap: 1rem;
    }

    .projects h2,
    .about h2,
    .skills h2,
    .contact h2 {
        font-size: 2rem;
    }

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

    .hero-links {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 200px;
    }

    .nav-container,
    .hero,
    .about,
    .projects,
    .skills,
    .contact {
        padding-left: 20px;
        padding-right: 20px;
    }

    .about-content {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
    }

    .about-image {
        width: 150px;
        height: 150px;
    }

    .modal-content {
        width: 95%;
        margin: 20px auto;
        height: 70vh;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-quote {
        font-size: 0.9rem;
    }

    .nav-brand {
        font-size: 1.2rem;
    }

    .nav-menu {
        gap: 0.5rem;
        font-size: 0.8rem;
    }

    .project-card {
        padding: 1.5rem;
    }

    .skill-category {
        padding: 1.5rem;
    }

    .hero-links {
        flex-direction: column;
        gap: 0.5rem;
    }

    .btn {
        width: 150px;
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .about-image {
        width: 120px;
        height: 120px;
    }
}