/* Reset dan variabel */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --text-color: #333;
    --light-bg: #f5f6fa;
    --dark-bg: #121212;
    --dark-text: #f5f5f5;
    --dark-card: #1e1e1e;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

body.dark-mode {
    background-color: var(--dark-bg);
    color: var(--dark-text);
}

body.dark-mode .nav-content,
body.dark-mode .timeline-item,
body.dark-mode .skill-item,
body.dark-mode .experience-item,
body.dark-mode .contact-item,
body.dark-mode .project-item {
    background-color: var(--dark-card);
    color: var(--dark-text);
}

body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode .logo a,
body.dark-mode .nav-links a {
    color: var(--dark-text);
}

body.dark-mode .timeline-dot {
    background-color: var(--secondary-color);
    border-color: var(--dark-card);
}

body.dark-mode .timeline::before {
    background-color: var(--secondary-color);
}

body.dark-mode .project-tech span {
    background-color: var(--dark-card);
    color: var(--dark-text);
    border: 1px solid var(--secondary-color);
}

body.dark-mode .contact-item a {
    color: var(--dark-text);
}

body.dark-mode .theme-switch i {
    color: var(--dark-text);
}

body.dark-mode .mobile-menu-btn {
    color: var(--dark-text);
}

/* Navbar */
nav {
    position: fixed;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: var(--transition);
}

body.dark-mode nav {
    background: rgba(30, 30, 30, 0.95);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--secondary-color);
}

.theme-switch {
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.theme-switch:hover {
    color: var(--secondary-color);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.mobile-menu-btn:hover {
    color: var(--secondary-color);
}

.mobile-menu-btn.active {
    color: var(--secondary-color);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 2rem;
    transition: var(--transition);
}

body.dark-mode .hero {
    background: linear-gradient(135deg, #1a1a1a 0%, #2c3e50 100%);
}

.hero-content {
    text-align: center;
}

.profile-img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 1.5rem;
    border: 5px solid white;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.hero p {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.birth-date {
    font-size: 1rem;
    color: var(--text-color);
    margin-top: 0.5rem;
}

body.dark-mode .birth-date {
    color: var(--dark-text);
}

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

.social-links a {
    color: var(--primary-color);
    font-size: 1.5rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--secondary-color);
    transform: translateY(-3px);
}

/* Sections */
section {
    padding: 5rem 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

h2 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 3rem;
    font-size: 2rem;
}

/* About Section */
.about {
    background-color: var(--light-bg);
    transition: var(--transition);
}

body.dark-mode .about {
    background-color: var(--dark-bg);
}

.about p {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
}

/* Education Section */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: 50px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    height: 100%;
    width: 2px;
    background-color: var(--secondary-color);
}

.timeline-item {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    position: relative;
}

.timeline-dot {
    position: absolute;
    left: -45px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: white;
    border: 3px solid var(--secondary-color);
    z-index: 1;
}

.timeline-content {
    margin-left: 10px;
}

.timeline-item:hover {
    transform: translateY(-5px);
}

.timeline-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

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

.skill-item {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.skill-item:hover {
    transform: translateY(-5px);
}

.skill-item i {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

/* Projects Section */
.projects {
    background-color: var(--light-bg);
    transition: var(--transition);
}

body.dark-mode .projects {
    background-color: var(--dark-bg);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 1rem;
}

.project-item {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.project-item:hover {
    transform: translateY(-10px);
}

.project-img {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.project-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.project-item:hover .project-img img {
    transform: scale(1.05);
}

.project-info {
    padding: 1.5rem;
}

.project-info h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.project-info p {
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-tech span {
    background-color: var(--light-bg);
    color: var(--text-color);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    border: 1px solid var(--secondary-color);
}

/* Experience Section */
.experience-item {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    margin-bottom: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.experience-item:hover {
    transform: translateY(-5px);
}

.experience-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.duration {
    color: var(--secondary-color);
    font-weight: 500;
    margin-bottom: 1rem;
}

/* Contact Section */
.contact {
    background-color: var(--light-bg);
    transition: var(--transition);
}

body.dark-mode .contact {
    background-color: var(--dark-bg);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.contact-item {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateY(-5px);
}

.contact-item i {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.contact-item a {
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.contact-item a:hover {
    color: var(--secondary-color);
}

/* Footer */
footer {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 1.5rem;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .container {
        padding: 0 1rem;
    }
}

@media (max-width: 992px) {
    html {
        font-size: 15px;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .profile-img {
        width: 180px;
        height: 180px;
    }
    
    .projects-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .nav-content {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
        width: 100%;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .nav-links.active {
        max-height: 300px;
    }
    
    .mobile-menu-btn {
        display: block;
        position: absolute;
        top: 1rem;
        right: 1rem;
    }
    
    .theme-switch {
        margin-top: 0.5rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .profile-img {
        width: 150px;
        height: 150px;
    }
    
    .timeline {
        padding-left: 30px;
    }
    
    .timeline-dot {
        left: -25px;
        width: 15px;
        height: 15px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    section {
        padding: 3rem 1rem;
    }
    
    h2 {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }
}

@media (max-width: 576px) {
    html {
        font-size: 13px;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .profile-img {
        width: 130px;
        height: 130px;
    }
    
    .timeline {
        padding-left: 25px;
    }
    
    .timeline-dot {
        left: -20px;
        width: 12px;
        height: 12px;
    }
    
    .timeline-item {
        padding: 1rem;
    }
    
    .skill-item, .experience-item, .contact-item {
        padding: 1.5rem;
    }
    
    .project-info {
        padding: 1rem;
    }
    
    .project-img {
        height: 180px;
    }
}