:root {
    --primary-color: #0f172a;
    --secondary-color: #2563eb;
    --accent-color: #3b82f6;
    --bg-light: #f8fafc;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --white: #ffffff;
    --card-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-light);
    background-image: radial-gradient(at 0% 0%, hsla(225,39%,30%,0.05) 0, transparent 50%), 
                      radial-gradient(at 50% 0%, hsla(225,39%,20%,0.05) 0, transparent 50%);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 8%;
    background-color: rgba(248, 250, 252, 0.8);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.lang-switcher {
    display: flex;
    background-color: #e2e8f0;
    padding: 4px;
    border-radius: 6px;
}

.lang-btn {
    border: none;
    background: none;
    padding: 4px 8px;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    border-radius: 4px;
    color: var(--text-muted);
    transition: all 0.2s;
}

.lang-btn.active {
    background-color: var(--white);
    color: var(--secondary-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.logo .logo-text {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color);
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

nav ul li a:hover, nav ul li a.active {
    color: var(--secondary-color);
}

nav ul li a.active {
    position: relative;
}

nav ul li a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 15px;
    height: 2px;
    background-color: var(--secondary-color);
    border-radius: 2px;
}

.btn-hire {
    background-color: transparent;
    color: var(--primary-color);
    padding: 8px 18px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 2px solid var(--primary-color);
    position: relative;
}

.btn-hire i {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

.btn-hire:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 4px 4px 0px var(--secondary-color);
}

.btn-hire:hover i {
    color: var(--white);
}

.btn-hire:active {
    transform: translateY(0);
    box-shadow: none;
}

main {
    width: 100%;
}

/* FIX LOMPAT-LOMPAT: Section main container must have stable dimensions */
section {
    width: 100%;
    padding: 80px 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

#home {
    padding-top: 140px;
}

/* Maintain UI/UX scale 0.9 via width and padding instead of transform scale */
.section-content {
    width: 90%; /* Representing the 0.9 scale */
    max-width: 1000px; /* Reduced from 1100 to maintain the "small" look */
    opacity: 0;
    filter: blur(10px);
    transition: all 1s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Reveal Animation */
.section-content.show {
    opacity: 1;
    filter: blur(0);
}

/* Hero Card */
.hero-card {
    background-color: var(--white);
    display: flex;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    width: 100%;
}

.card-left {
    flex: 1;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    min-height: 450px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

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

.image-placeholder {
    color: rgba(255, 255, 255, 0.1);
    font-size: 2rem;
    font-weight: 700;
}

.card-right {
    flex: 1.2;
    padding: 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.greeting {
    color: var(--secondary-color);
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.card-right h1 {
    font-size: 3rem;
    color: var(--primary-color);
    font-weight: 800;
    margin-bottom: 20px;
}

.description {
    color: var(--text-muted);
    margin-bottom: 30px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-icon {
    width: 45px;
    height: 45px;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-icon:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
}

/* Services */
.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 2.2rem;
    color: var(--primary-color);
    font-weight: 800;
}

.underline {
    width: 50px;
    height: 4px;
    background-color: var(--secondary-color);
    margin: 10px auto;
    border-radius: 2px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    width: 100%;
}

.service-card {
    background-color: var(--white);
    padding: 40px;
    border-radius: 20px;
    border: 1px solid #f1f5f9;
    transition: all 0.3s ease;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--card-shadow);
    border-color: var(--secondary-color);
}

.service-icon {
    width: 60px;
    height: 60px;
    background-color: var(--bg-light);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--secondary-color);
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

/* Portfolio */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    width: 100%;
}

.portfolio-item {
    background-color: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border: 1px solid #f1f5f9;
}

.portfolio-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--card-shadow);
}

.portfolio-img {
    height: 200px;
    background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
    display: flex;
    justify-content: center;
    align-items: center;
}

.img-placeholder {
    color: var(--text-muted);
    font-weight: 700;
    font-size: 1.2rem;
    opacity: 0.5;
}

.portfolio-info {
    padding: 25px;
    position: relative;
}

.portfolio-info h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 700;
}

.portfolio-info p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0;
}

.view-btn {
    position: absolute;
    right: 25px;
    top: 25px;
    width: 40px;
    height: 40px;
    background-color: var(--bg-light);
    color: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.portfolio-item:hover .view-btn {
    background-color: var(--secondary-color);
    color: var(--white);
}

/* Scroll Top */
.scroll-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    background-color: var(--secondary-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.scroll-top-btn.show {
    opacity: 1;
    visibility: visible;
}

/* Chatbot AI Toggle */
.chat-toggle {
    position: fixed;
    bottom: 30px;
    right: 90px;
    width: 45px;
    height: 45px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(15, 23, 42, 0.3);
    z-index: 1000;
    transition: all 0.3s ease;
}

.chat-toggle:hover {
    transform: translateY(-5px);
    background-color: var(--secondary-color);
}

.chatbot-container {
    position: fixed;
    bottom: 90px;
    right: 30px;
    width: 320px;
    height: 450px;
    background-color: var(--white);
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.chatbot-container.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.chatbot-header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.bot-info {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 0.9rem;
}

#closeChat {
    background: none;
    border: none;
    color: var(--white);
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.2s;
}

#closeChat:hover { opacity: 1; }

.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
    background-color: #f8fafc;
}

.message {
    max-width: 85%;
    padding: 10px 15px;
    border-radius: 15px;
    font-size: 0.85rem;
    line-height: 1.4;
}

.message.bot {
    align-self: flex-start;
    background-color: var(--white);
    color: var(--text-main);
    border-bottom-left-radius: 2px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.message.user {
    align-self: flex-end;
    background-color: var(--secondary-color);
    color: var(--white);
    border-bottom-right-radius: 2px;
}

.chat-input {
    padding: 15px;
    display: flex;
    gap: 10px;
    border-top: 1px solid #f1f5f9;
}

.chat-input input {
    flex: 1;
    border: 1px solid #e2e8f0;
    padding: 8px 15px;
    border-radius: 10px;
    outline: none;
    font-size: 0.85rem;
}

.chat-input input:focus {
    border-color: var(--secondary-color);
}

.chat-input button {
    background-color: var(--secondary-color);
    color: var(--white);
    border: none;
    width: 35px;
    height: 35px;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.chat-input button:hover {
    background-color: var(--primary-color);
}

/* --- Native Mobile UI/UX Optimization --- */

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
}

@media (max-width: 768px) {
    header {
        padding: 15px 5%;
        border-bottom: 1px solid rgba(0,0,0,0.05);
    }

    .menu-toggle {
        display: block;
        order: 2;
    }

    .header-right {
        order: 3;
        gap: 10px;
    }

    .logo {
        order: 1;
    }

    nav {
        display: block; /* Override previous display: none */
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: var(--white);
        padding: 100px 40px;
        box-shadow: -10px 0 30px rgba(0,0,0,0.1);
        transition: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        z-index: 999;
    }

    nav.active {
        right: 0;
    }

    nav ul {
        flex-direction: column;
        gap: 30px;
    }

    nav ul li {
        margin: 0;
    }

    nav ul li a {
        font-size: 1.2rem;
        display: block;
        width: 100%;
    }

    /* Mobile Cards Styling */
    .hero-card {
        flex-direction: column;
        border-radius: 0; /* App-like bleed */
        margin: -20px;
        width: calc(100% + 40px);
        box-shadow: none;
    }

    .card-left {
        min-height: 300px;
    }

    .card-right {
        padding: 40px 20px;
        text-align: center;
    }

    .card-right h1 {
        font-size: 2.2rem;
    }

    .social-links {
        justify-content: center;
    }

    /* Modern Mobile Grid */
    .services-grid, .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 15px;
        padding: 0 10px;
    }

    .service-card, .portfolio-item {
        border-radius: 16px;
        padding: 25px;
    }

    /* Native-like Floating Chat */
    .chatbot-container {
        width: 100%;
        height: 100%;
        bottom: 0;
        right: 0;
        border-radius: 0;
        transform: translateY(100%);
    }

    .chatbot-container.show {
        transform: translateY(0);
    }

    .chatbot-header {
        padding: 20px;
        border-radius: 0;
    }

    /* Hide language button on mobile to save space if needed */
    .btn-hire span { display: none; }
    .btn-hire { padding: 8px 12px; }
}

@media (max-width: 768px) {
    header { padding: 15px 5%; }
    .hero-card { flex-direction: column; }
    .card-right { padding: 40px 30px; }
    .card-right h1 { font-size: 2.2rem; }
    .section-content { width: 95%; }
}

/* Timeline Styles */
.timeline-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin: 40px auto 0;
    text-align: left;
}

@media (max-width: 768px) {
    .timeline-container {
        grid-template-columns: 1fr;
    }
}

.timeline-section h3 {
    color: var(--text-main);
    margin-bottom: 25px;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.timeline-item {
    position: relative;
    padding-left: 30px;
    margin-bottom: 30px;
    border-left: 2px solid var(--secondary-color);
}

.timeline-dot {
    position: absolute;
    left: -7px;
    top: 5px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--secondary-color);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.2);
}

.timeline-content {
    background: var(--white);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 30px -5px rgb(0 0 0 / 0.15);
}

.timeline-content h4 {
    color: var(--text-main);
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.timeline-content h5 {
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 10px;
}

.timeline-date {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(37, 99, 235, 0.1);
    color: var(--secondary-color);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.timeline-content p {
    color: var(--text-muted);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Skills Tags Styles */
.skills-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    max-width: 900px;
    margin: 0 auto;
}

.skill-tag {
    background: rgba(37, 99, 235, 0.1);
    color: var(--secondary-color);
    padding: 10px 20px;
    border-radius: 30px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    border: 1px solid rgba(37, 99, 235, 0.2);
}

.skill-tag:hover {
    background: var(--secondary-color);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
}

/* Contact Section Simple */
.contact-simple {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 30px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    color: var(--text-main);
    font-weight: 500;
}

.contact-item i {
    color: var(--secondary-color);
    font-size: 1.3rem;
}

@media (max-width: 600px) {
    .contact-simple {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
}

.social-links-pro {
    display: flex;
    gap: 15px;
    margin-top: 10px;
}

.social-btn {
    width: 45px;
    height: 45px;
    background: var(--white);
    color: var(--text-main);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    text-decoration: none;
}

.social-btn:hover {
    background: var(--secondary-color);
    color: var(--white);
    transform: translateY(-3px);
}

.contact-form {
    background: var(--white);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.contact-form .input-group {
    margin-bottom: 20px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    font-family: 'Poppins', sans-serif;
    font-size: 0.95rem;
    color: var(--text-main);
    background: var(--bg-light);
    transition: all 0.3s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.submit-btn {
    background: var(--secondary-color);
    color: var(--white);
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    justify-content: center;
}

.submit-btn:hover {
    background: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2);
}