/* ==========================================================================
   1. VARIABLES & RESET
   ========================================================================== */
:root {
    /* Color Palette */
    --color-dark-navy: #0F1B33;
    --color-navy: #172B4D;
    --color-white: #FFFFFF;
    --color-light-bg: #F7F9FC;
    --color-gold: #D9A441;
    --color-gold-hover: #c49233;
    --color-dark-text: #172033;
    --color-secondary-text: #667085;
    --color-border: #E4E8EE;

    /* Typography */
    --font-primary: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Transitions & Shadows */
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --shadow-sm: 0 2px 8px rgba(15, 27, 51, 0.05);
    --shadow-md: 0 8px 24px rgba(15, 27, 51, 0.08);
    --shadow-lg: 0 16px 32px rgba(15, 27, 51, 0.12);
    --radius: 12px;
}

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-white);
    color: var(--color-dark-text);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ==========================================================================
   2. REUSABLE COMPONENTS
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 5rem 0;
}

.light-bg {
    background-color: var(--color-light-bg);
}

.section-header {
    margin-bottom: 3rem;
}

.section-header.center {
    text-align: center;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--color-dark-navy);
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--color-secondary-text);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

.section-divider {
    width: 50px;
    height: 3px;
    background-color: var(--color-gold);
    margin: 1rem auto 0 auto;
    border-radius: 2px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-sm {
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
}

.btn-full {
    width: 100%;
}

.btn-gold {
    background-color: var(--color-gold);
    color: var(--color-dark-navy);
}

.btn-gold:hover {
    background-color: var(--color-gold-hover);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--color-navy);
    color: var(--color-navy);
}

.btn-outline:hover {
    background-color: var(--color-navy);
    color: var(--color-white);
    transform: translateY(-2px);
}

/* Cards */
.card {
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 20px;
}

.badge-basic { background: #E3F2FD; color: #0D47A1; }
.badge-intermediate { background: #FEF3C7; color: #92400E; }
.badge-learning { background: #E0E7FF; color: #3730A3; }

/* ==========================================================================
   3. NAVBAR
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    transition: var(--transition);
    padding: 1.25rem 0;
}

.navbar.scrolled {
    padding: 0.85rem 0;
    box-shadow: var(--shadow-sm);
    background-color: var(--color-white);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-dark-navy);
}

.nav-logo span {
    color: var(--color-gold);
}

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

.nav-link {
    color: var(--color-dark-text);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--color-gold);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-gold);
    border-radius: 2px;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}

.nav-toggle .bar {
    width: 25px;
    height: 3px;
    background-color: var(--color-dark-navy);
    transition: var(--transition);
    border-radius: 2px;
}

.mobile-btn {
    display: none;
}

/* ==========================================================================
   4. HERO SECTION
   ========================================================================== */
.hero {
    padding: 9rem 0 5rem 0;
    background: linear-gradient(135deg, #FFFFFF 0%, #F7F9FC 100%);
    overflow: hidden;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    align-items: center;
    gap: 4rem;
}

.hero-greeting {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-gold);
    display: block;
    margin-bottom: 0.5rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-dark-navy);
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-secondary-text);
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1rem;
    color: var(--color-secondary-text);
    margin-bottom: 2rem;
    max-width: 540px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.hero-socials {
    display: flex;
    gap: 1.25rem;
}

.hero-socials a {
    color: var(--color-navy);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-socials a:hover {
    color: var(--color-gold);
    transform: translateY(-3px);
}

.hero-image-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
}

.hero-image-container {
    position: relative;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    padding: 8px;
    background: linear-gradient(135deg, var(--color-dark-navy), var(--color-gold));
    box-shadow: var(--shadow-lg);
    z-index: 2;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    z-index: 1;
    opacity: 0.15;
}

.shape-1 {
    width: 350px;
    height: 350px;
    background: var(--color-navy);
    top: -20px;
    right: -20px;
    animation: float 6s ease-in-out infinite;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background: var(--color-gold);
    bottom: -20px;
    left: 0;
    animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* ==========================================================================
   5. ABOUT SECTION
   ========================================================================== */
.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text {
    font-size: 1.1rem;
    color: var(--color-secondary-text);
    text-align: center;
    margin-bottom: 3rem;
    line-height: 1.8;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.stat-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--color-gold);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-gold);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-dark-navy);
}

/* ==========================================================================
   6. CAROUSEL REUSABLE (MATERI & SERTIFIKAT)
   ========================================================================== */
.carousel-container {
    position: relative;
    max-width: 100%;
    margin: 0 auto;
    padding: 0 3rem;
}

.carousel-track-container {
    overflow: hidden;
    width: 100%;
    border-radius: var(--radius);
}

.carousel-track {
    display: flex;
    transition: transform 0.4s ease-in-out;
    will-change: transform;
}

.carousel-slide {
    flex: 0 0 33.333%;
    padding: 0 0.75rem;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    color: var(--color-dark-navy);
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.carousel-btn:hover {
    background: var(--color-navy);
    color: var(--color-white);
}

.btn-prev { left: 0; }
.btn-next { right: 0; }

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 2rem;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-border);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--color-gold);
    width: 24px;
    border-radius: 10px;
}

/* Materi Cards */
.materi-card {
    height: 100%;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.materi-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.materi-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-dark-navy);
    margin-bottom: 0.75rem;
}

.materi-desc {
    font-size: 0.9rem;
    color: var(--color-secondary-text);
}

/* ==========================================================================
   7. PROJECT SECTION
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.project-card {
    padding: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.project-img-wrapper {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background-color: var(--color-light-bg);
}

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

.project-card:hover .project-img {
    transform: scale(1.08);
}

.project-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-dark-navy);
    margin-bottom: 0.5rem;
}

.project-desc {
    font-size: 0.875rem;
    color: var(--color-secondary-text);
    margin-bottom: 1.25rem;
    flex-grow: 1;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-tech span {
    font-size: 0.75rem;
    background: var(--color-light-bg);
    color: var(--color-navy);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    font-weight: 600;
}

.project-links {
    display: flex;
    gap: 0.75rem;
}

/* ==========================================================================
   8. SERTIFIKAT GALLERY CAROUSEL
   ========================================================================== */
.cert-card {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    cursor: pointer;
    background: var(--color-white);
}

.cert-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: var(--transition);
}

.cert-card:hover .cert-img {
    transform: scale(1.05);
    opacity: 0.9;
}

/* ==========================================================================
   9. SKILLS SECTION
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.skill-category-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-dark-navy);
    margin-bottom: 1.25rem;
    border-bottom: 2px solid var(--color-light-bg);
    padding-bottom: 0.5rem;
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.skill-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
    font-weight: 500;
}

/* ==========================================================================
   10. CONTACT SECTION & FORM
   ========================================================================== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.contact-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.contact-item h4 {
    font-size: 1rem;
    color: var(--color-dark-navy);
}

.contact-item p {
    font-size: 0.9rem;
    color: var(--color-secondary-text);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-dark-navy);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--color-gold);
    box-shadow: 0 0 0 3px rgba(217, 164, 65, 0.2);
}

.form-group.error .form-control {
    border-color: #E53E3E;
}

.error-text {
    font-size: 0.75rem;
    color: #E53E3E;
    display: none;
}

.form-group.error .error-text {
    display: block;
}

.form-alert {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    display: none;
}

.form-alert.success {
    display: block;
    background: #DEF7EC;
    color: #03543F;
    border: 1px solid #BCF0DA;
}

/* ==========================================================================
   11. FOOTER
   ========================================================================== */
.footer {
    background-color: var(--color-dark-navy);
    color: var(--color-white);
    padding: 3rem 0;
    text-align: center;
}

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-brand p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--color-gold);
}

.footer-copy {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    width: 100%;
    padding-top: 1.5rem;
}

/* ==========================================================================
   12. MODAL & BACK TO TOP
   ========================================================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.open {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 27, 51, 0.85);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    z-index: 2001;
}

.modal-img {
    max-width: 100%;
    max-height: 85vh;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    object-fit: contain;
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: var(--color-white);
    font-size: 2rem;
    cursor: pointer;
}

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background-color: var(--color-gold);
    color: var(--color-dark-navy);
    border: none;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--color-navy);
    color: var(--color-white);
}

/* ==========================================================================
   13. ANIMATIONS & REVEAL EFFECTS
   ========================================================================== */
.fade-in-element {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-element.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   14. RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================================================== */
@media (max-width: 1024px) {
    .carousel-slide {
        flex: 0 0 50%;
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--color-white);
        flex-direction: column;
        justify-content: center;
        gap: 1.5rem;
        transition: var(--transition);
        box-shadow: var(--shadow-md);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-btn-desktop {
        display: none;
    }

    .mobile-btn {
        display: block;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-buttons, .hero-socials {
        justify-content: center;
    }

    .hero-image-wrapper {
        order: -1;
    }

    .hero-image-container {
        width: 240px;
        height: 240px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .contact-wrapper {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .carousel-slide {
        flex: 0 0 100%;
    }

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

    .carousel-container {
        padding: 0 2rem;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}