:root {
    --primary-blue: #1e88e5;
    --dark-blue: #0d47a1;
    --light-blue: #bbdefb;
    --accent-blue: #42a5f5;
    --background: #f5f9ff;
    --text-dark: #212121;
    --text-light: #ffffff;
    --border-radius: 12px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    
    /* Gradien dari CSS2 - hanya yang penting */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8fbff 100%);
    --gradient-nav: linear-gradient(135deg, #1e88e5 0%, #0d47a1 100%);
}

/* Font Local - dipertahankan dari CSS1 */
@font-face {
    font-family: 'Arial Rounded MT Bold';
    src: url('../fonts/Arial Rounded MT Bold.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

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

body {
    font-family: "Arial Rounded MT Bold", "VAG Rounded BT", "Nunito", sans-serif;
    background-color: var(--background);
    color: var(--text-dark);
    line-height: 1.3;
    background-image: linear-gradient(120deg, #e0f7fa 0%, #f5f9ff 100%);
    min-height: 100vh;
    font-size: 16px;
}

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

/* GROUPING STYLES - dipertahankan dari CSS1 */
.content-group-1 {
  margin-bottom: 40px;
}

.content-group-2 {
  margin-bottom: 40px;
}

/* Night mode untuk grouping */
body.night-mode .content-group-1,
body.night-mode .content-group-2 {
  background: transparent;
}

/* Header & Navigation - FIXED SIZE dengan gradien dari CSS2 */
#headerArea {
    background: var(--gradient-nav);
    border-radius: var(--border-radius);
    padding: 10px;
    margin-bottom: 30px;
    box-shadow: var(--box-shadow);
}

#navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    gap: 15px;
}

.nav-left,
.nav-right {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.nav-center {
    flex: 1;
    display: flex;
    justify-content: center;
    min-width: 0;
}

.nav-center ul {
    display: flex;
    list-style: none;
    gap: 15px;
    flex-wrap: nowrap;
    padding: 0 15px;
    justify-content: center;
}

.nav-center li {
    flex-shrink: 0;
}

.nav-center li a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 18px;
    padding: 12px 25px;
    border-radius: 30px;
    background: rgba(255, 255, 255, 0.15);
    transition: all 0.3s ease;
    display: block;
    text-align: center;
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    white-space: nowrap;
}

.nav-center li a:hover,
.nav-center li a:focus {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Logo Container dengan animasi ringan */
.logo-container {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    border-radius: 30px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(4px);
    transition: all 0.3s ease;
    text-decoration: none;
    flex-shrink: 0;
}

.logo-container:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.logo {
    height: 40px;
    width: auto;
    transition: transform 0.3s ease;
}

.logo-container:hover .logo {
    transform: scale(1.05);
}

/* Night Mode Toggle Button */
#nightModeToggle {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    border-radius: 30px;
    padding: 12px 20px;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s ease;
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 60px;
    height: 48px;
    flex-shrink: 0;
}

#nightModeToggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.toggle-icon {
    transition: transform 0.3s ease;
}

/* Main Content Area dengan gradien ringan */
main {
    background: var(--gradient-card);
    border-radius: var(--border-radius);
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: var(--box-shadow);
    border: 1px solid var(--light-blue);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1, h2, h3 {
    color: var(--dark-blue);
    margin-bottom: 1px;
    position: relative;
}

h1 {
    font-size: 2rem;
    margin-bottom: 20px;
    text-align: center;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

h1:after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 2px;
    margin: 15px auto;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scaleX(1); opacity: 1; }
    50% { transform: scaleX(1.1); opacity: 0.8; }
}

.center-content {
    text-align: center;
    padding: 0 10%;
}

/* Box Elements dengan gradien dan animasi ringan */
.box {
    background: var(--gradient-card);
    border-radius: var(--border-radius);
    padding: 20px;
    margin: 20px 0;
    border: 1px solid var(--light-blue);
    box-shadow: var(--box-shadow);
    transition: all 0.3s ease;
}

.box:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.box p {
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 15px;
}

.box strong {
    font-size: 1rem;
}

/* Button Links dengan gradien */
.button-link {
    display: inline-block;
    padding: 10px 20px;
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: bold;
    transition: all 0.3s ease;
    margin-top: 15px;
    font-size: 1rem;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.button-link:hover {
    background: var(--gradient-secondary);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

/* Video Elements */
.youtube-video {
    aspect-ratio: 16 / 9;
    width: 100%;
    border-radius: 10px;
    border: none;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
    background: #000;
}

/* Flex Layouts dengan animasi ringan */
.flex-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    margin: 25px 0;
}

.flex-item {
    flex: 1;
    min-width: 250px;
    max-width: 300px;
    background: var(--gradient-card);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--light-blue);
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.flex-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.12);
    border-color: var(--accent-blue);
}

.flex-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 3px solid;
    border-image: var(--gradient-accent) 1;
    transition: transform 0.3s ease;
}

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

.flex-item p {
    padding: 15px;
    text-align: center;
    font-size: 18px;
    color: var(--dark-blue);
    font-weight: bold;
}

.flex-item a {
    display: block;
    padding: 12px;
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    text-align: center;
    font-size: 16px;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    transition: all 0.3s ease;
}

.flex-item a:hover {
    background: var(--gradient-secondary);
}

/* Footer dengan gradien */
footer#footer {
    text-align: center;
    padding: 25px;
    background: var(--gradient-nav);
    color: var(--text-light);
    border-radius: var(--border-radius);
    margin-top: 30px;
    box-shadow: var(--box-shadow);
    font-size: 1rem;
}

/* Search Container */
.search-container {
    margin: 20px 0 30px;
    position: relative;
}

.search-input {
    width: 100%;
    padding: 15px 20px;
    border: 1px solid var(--light-blue);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    background: white;
    box-shadow: var(--box-shadow);
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 6px 15px rgba(66, 165, 245, 0.2);
}

/* Search Results */
.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--light-blue);
    max-height: 300px;
    overflow-y: auto;
    z-index: 100;
    display: none;
}

.search-results.active {
    display: block;
}

.search-result-item {
    padding: 15px 20px;
    border-bottom: 1px solid var(--light-blue);
    cursor: pointer;
    transition: background-color 0.2s ease;
    font-size: 0.9rem;
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover {
    background-color: var(--light-blue);
}

.search-result-item.highlight {
    background-color: var(--accent-blue);
    color: white;
}

/* Hidden class for filtered items */
.box.hidden {
    display: none;
}

/* No results message */
.no-results {
    padding: 20px;
    text-align: center;
    color: var(--dark-blue);
    font-style: italic;
}

/* Scroll to Top Button - versi ringan */
.scroll-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: var(--box-shadow);
    transition: all 0.3s ease;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
}

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

.scroll-to-top:hover {
    transform: translateY(-3px);
    background: var(--gradient-secondary);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

/* Responsive Design - FIXED FOR MOBILE (dipertahankan dari CSS1) */
@media (max-width: 1100px) {
    .nav-center li a {
        font-size: 17px;
        padding: 11px 22px;
    }
    
    .logo {
        height: 38px;
    }
    
    .logo-container {
        padding: 9px 18px;
    }
    
    #nightModeToggle {
        padding: 11px 18px;
        font-size: 17px;
    }
}

@media (max-width: 900px) {
    #navbar {
        flex-wrap: nowrap;
        gap: 10px;
    }
    
    .nav-center {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scroll-behavior: smooth;
        padding-bottom: 5px;
        justify-content: flex-start;
    }
    
    .nav-center ul {
        padding: 0 10px;
        gap: 12px;
    }
    
    .nav-center li a {
        font-size: 16px;
        padding: 10px 18px;
    }
    
    .logo {
        height: 35px;
    }
    
    .logo-container {
        padding: 8px 16px;
    }
    
    #nightModeToggle {
        padding: 10px 16px;
        min-width: 55px;
        height: 45px;
        font-size: 16px;
    }
    
    main {
        padding: 22px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.4rem;
    }
    
    .box {
        padding: 18px;
    }
    
    /* Custom scrollbar untuk mobile */
    .nav-center::-webkit-scrollbar {
        height: 4px;
    }
    
    .nav-center::-webkit-scrollbar-track {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 2px;
    }
    
    .nav-center::-webkit-scrollbar-thumb {
        background: rgba(255, 255, 255, 0.3);
        border-radius: 2px;
    }
    
    .nav-center::-webkit-scrollbar-thumb:hover {
        background: rgba(255, 255, 255, 0.5);
    }
}

@media (max-width: 720px) {
    body {
        font-size: 15px;
    }
    
    #container {
        padding: 15px;
    }
    
    .nav-center li a {
        font-size: 15px;
        padding: 9px 16px;
    }
    
    .logo {
        height: 32px;
    }
    
    .logo-container {
        padding: 7px 14px;
    }
    
    #nightModeToggle {
        padding: 9px 14px;
        min-width: 50px;
        height: 42px;
        font-size: 15px;
    }
    
    main {
        padding: 20px;
    }
    
    h1 {
        font-size: 1.6rem;
    }
    
    h2 {
        font-size: 1.3rem;
    }
    
    h3 {
        font-size: 1.1rem;
    }
    
    .box {
        padding: 16px;
        margin: 18px 0;
    }
    
    .button-link {
        padding: 9px 18px;
        font-size: 0.95rem;
    }
    
    .search-input {
        padding: 14px 18px;
        font-size: 0.95rem;
    }
    
    .search-result-item {
        padding: 14px 18px;
        font-size: 0.9rem;
    }
    
    footer#footer {
        font-size: 0.95rem;
    }
}

@media (max-width: 600px) {
    body {
        font-size: 14px;
    }
    
    #container {
        padding: 12px;
    }
    
    .nav-center li a {
        font-size: 14px;
        padding: 8px 14px;
    }
    
    .logo {
        height: 30px;
    }
    
    .logo-container {
        padding: 6px 12px;
    }
    
    #nightModeToggle {
        padding: 8px 12px;
        min-width: 48px;
        height: 40px;
        font-size: 14px;
    }
    
    main {
        padding: 18px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    h2 {
        font-size: 1.2rem;
    }
    
    .box {
        padding: 14px;
    }
    
    .button-link {
        padding: 8px 16px;
        font-size: 0.9rem;
    }
    
    footer#footer {
        padding: 22px;
        font-size: 0.9rem;
    }
    
    .flex-item {
        min-width: 100%;
        max-width: 100%;
    }
    
    .flex-item p {
        font-size: 16px;
        padding: 12px;
    }
    
    .flex-item a {
        font-size: 14px;
        padding: 10px;
    }
}

@media (max-width: 400px) {
    body {
        font-size: 13px;
    }
    
    .nav-center li a {
        font-size: 13px;
        padding: 7px 12px;
    }
    
    .logo {
        height: 28px;
    }
    
    .logo-container {
        padding: 5px 10px;
    }
    
    #nightModeToggle {
        padding: 7px 10px;
        min-width: 45px;
        height: 38px;
        font-size: 13px;
    }
    
    main {
        padding: 15px;
    }
    
    h1 {
        font-size: 1.4rem;
    }
    
    h2 {
        font-size: 1.1rem;
    }
    
    .box {
        padding: 12px;
    }
    
    .button-link {
        padding: 7px 14px;
        font-size: 0.85rem;
    }
    
    footer#footer {
        font-size: 0.85rem;
    }
}