/* Kumar Chandra Portfolio Website Styles - FINAL & BUG-FREE VERSION */

/* Global Styles */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --primary-color: #0B63A6; --accent-color: #0FB2B2; --bg-light: #f6f8fb;
    --text-color: #2E2E2E; --white: #ffffff; --gray-light: #f0f0f0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1); --transition: all 0.3s ease;
}
body { font-family: 'Poppins', sans-serif; line-height: 1.6; color: var(--text-color); background-color: var(--bg-light); overflow-x: hidden; }
html { scroll-behavior: smooth; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 1rem; }

/* Header & Navigation */
.header { background: var(--white); padding: 1rem 0; position: fixed; top: 0; width: 100%; z-index: 1000; box-shadow: var(--shadow); }
.nav { display: flex; justify-content: space-between; align-items: center; }
.nav-brand { font-size: 1.5rem; font-weight: 700; color: var(--primary-color); text-decoration: none; }
.nav-menu { display: flex; list-style: none; gap: 2rem; }
.nav-link { color: var(--text-color); text-decoration: none; font-weight: 500; transition: var(--transition); }
.nav-link:hover { color: var(--primary-color); }
.nav-toggle { display: none; flex-direction: column; cursor: pointer; gap: 4px; }
.nav-toggle span { width: 25px; height: 3px; background: var(--text-color); border-radius: 2px; transition: var(--transition); }

/* Hero Section */
.hero { background: linear-gradient(135deg, var(--primary-color), var(--accent-color)); color: var(--white); padding: 150px 0 100px; text-align: center; min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.hero-content { max-width: 800px; }
.profile-img { width: 150px; height: 150px; border-radius: 50%; border: 6px solid var(--white); margin-bottom: 2rem; object-fit: cover; box-shadow: var(--shadow); }
.hero h1 { font-size: 3rem; font-weight: 700; margin-bottom: 1rem; }
.hero-role { font-size: 1.3rem; margin-bottom: 1.5rem; opacity: 0.9; }
.hero-intro { font-size: 1.1rem; margin: 0 auto 2rem auto; opacity: 0.9; max-width: 600px; }
.hero-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn { padding: 12px 30px; border-radius: 50px; text-decoration: none; font-weight: 600; transition: var(--transition); border: 2px solid transparent; cursor: pointer; }
.btn-primary { background: var(--white); color: var(--primary-color); }
.btn-primary:hover { background: transparent; color: var(--white); border-color: var(--white); }
.btn-outline { background: transparent; color: var(--white); border: 2px solid var(--white); }
.btn-outline:hover { background: var(--white); color: var(--primary-color); }

/* Sections */
.section { padding: 80px 0; }
.section-title { text-align: center; font-size: 2.5rem; font-weight: 700; color: var(--primary-color); margin-bottom: 3rem; }

/* Skills */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; }
.skill-card { background: var(--white); padding: 2rem; border-radius: 15px; text-align: center; box-shadow: var(--shadow); transition: var(--transition); border: 3px solid transparent; }
.skill-card:hover { transform: translateY(-5px); border-color: var(--accent-color); }
.skill-icon { font-size: 3rem; color: var(--accent-color); margin-bottom: 1rem; }
.skill-title { font-size: 1.3rem; font-weight: 600; margin-bottom: 1rem; color: var(--primary-color); }
.skill-description { color: var(--text-color); opacity: 0.8; }

/* Experience */
.experience-timeline { max-width: 800px; margin: 0 auto; }
.experience-item { background: var(--white); padding: 2rem; border-radius: 15px; margin-bottom: 2rem; box-shadow: var(--shadow); border-left: 4px solid var(--accent-color); }
.experience-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 1rem; flex-wrap: wrap; gap: 1rem; }
.experience-title { font-size: 1.3rem; font-weight: 600; color: var(--primary-color); margin-bottom: 0.5rem; }
.experience-company { font-size: 1.1rem; color: var(--accent-color); }
.experience-duration { background: var(--accent-color); color: var(--white); padding: 0.5rem 1rem; border-radius: 20px; font-size: 0.9rem; white-space: nowrap; }

/* Projects */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.project-card { background: var(--white); border-radius: 15px; overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.project-card:hover { transform: translateY(-5px); }
.project-content { padding: 2rem; }
.project-title { font-size: 1.3rem; font-weight: 600; color: var(--primary-color); margin-bottom: 1rem; }
.project-description { color: var(--text-color); opacity: 0.8; margin-bottom: 1.5rem; }
.project-link { color: var(--accent-color); text-decoration: none; font-weight: 600; display: inline-flex; align-items: center; gap: 0.5rem; }
.project-link:hover { color: var(--primary-color); }

/* Slider */
.portfolio-slider { position: relative; max-width: 800px; margin: 0 auto; background: var(--white); border-radius: 15px; overflow: hidden; box-shadow: var(--shadow); }
.slider-container { display: flex; transition: transform 0.5s ease; }
.slide { min-width: 100%; padding: 3rem; text-align: center; }
.slide h3 { color: var(--primary-color); font-size: 1.5rem; margin-bottom: 1rem; }
.slide p { color: var(--text-color); opacity: 0.8; }
.slider-nav { position: absolute; top: 50%; transform: translateY(-50%); background: rgba(0, 0, 0, 0.3); color: var(--white); border: none; width: 40px; height: 40px; border-radius: 50%; cursor: pointer; font-size: 1.5rem; transition: var(--transition); z-index: 10; }
.slider-nav:hover { background: var(--primary-color); }
.slider-nav.prev { left: 15px; }
.slider-nav.next { right: 15px; }
.slider-dots { text-align: center; padding: 1rem; }
.dot { display: inline-block; width: 12px; height: 12px; border-radius: 50%; background: #ccc; margin: 0 5px; cursor: pointer; transition: var(--transition); }
.dot.active { background: var(--primary-color); }

/* Contact */
.contact-content { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }
.contact-form { background: var(--bg-light); padding: 2rem; border-radius: 15px; }
.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: var(--primary-color); }
.form-group input, .form-group textarea { width: 100%; padding: 12px; border: 2px solid #ddd; border-radius: 8px; font-family: inherit; transition: var(--transition); }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--accent-color); }
.contact-info { display: flex; flex-direction: column; gap: 1.5rem; }
.contact-item { display: flex; align-items: center; gap: 1rem; background: var(--bg-light); padding: 1.5rem; border-radius: 15px; }
.contact-icon { font-size: 1.5rem; color: var(--accent-color); }
.contact-text h4 { color: var(--primary-color); margin-bottom: 0.25rem; }
.contact-text p { color: var(--text-color); opacity: 0.8; }

/* Footer */
.footer { background: var(--text-color); color: var(--white); text-align: center; padding: 3rem 0; }
.social-links { display: flex; justify-content: center; gap: 1.5rem; margin-bottom: 1.5rem; }
.social-link { font-size: 1.5rem; color: var(--white); text-decoration: none; transition: var(--transition); }
.social-link:hover { color: var(--accent-color); transform: translateY(-3px); }

/* Responsive Design */
@media (max-width: 992px) {
    .contact-content { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .nav-menu { position: fixed; top: 65px; left: -100%; width: 100%; height: calc(100vh - 65px); background: var(--white); flex-direction: column; text-align: center; gap: 0; box-shadow: 0 4px 6px rgba(0,0,0,0.1); transition: left 0.3s ease-in-out; }
    .nav-menu.active { left: 0; }
    .nav-menu li { border-top: 1px solid var(--gray-light); width: 100%; }
    .nav-link { padding: 1rem; display: block; }
    .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); }
    .nav-toggle.active span:nth-child(2) { opacity: 0; }
    .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }
    .hero { padding: 120px 0 60px; }
    .hero h1 { font-size: 2.2rem; }
    .hero-role { font-size: 1.1rem; }
    .section-title { font-size: 2rem; }
    .experience-header { flex-direction: column; align-items: flex-start; }
    .slider-nav { display: none; }
}
@media (max-width: 480px) {
    .container { padding: 0 1rem; }
    .profile-img { width: 120px; height: 120px; }
    .hero h1 { font-size: 1.8rem; }
    .hero-role { font-size: 1rem; }
    .hero-intro { font-size: 0.9rem; }
}