:root {
    --primary: #2c3e50;
    --secondary: #e74c3c;
    --accent: #3498db;
    --light: #ecf0f1;
    --dark: #2c3e50;
    --text: #333;
    --text-light: #7f8c8d;
}

/* Global Styles */
/* reset box-sizing and default margins to avoid unexpected gaps/overflow */
*, *::before, *::after { box-sizing: border-box; }

html, body {
    height: 100%;
    margin: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text);
    padding-top: 76px;
    display: flex;
    flex-direction: column;
}

main, section {
    flex: 1;
}

.section-title {
    position: relative;
    padding-bottom: 15px;
    margin-bottom: 30px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--secondary);
}

/* Navigation */
.navbar-brand {
    font-size: 1.8rem;
}

.navbar-nav .nav-link {
    font-weight: 500;
    margin: 0 10px;
    position: relative;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary);
    transition: width 0.3s;
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    width: 100%;
}

/* Navbar scroll effect */
.navbar-scrolled {
    background-color: rgba(44, 62, 80, 0.95) !important;
    backdrop-filter: blur(10px);
    transition: background-color 0.3s ease;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), 
                url('https://images.unsplash.com/photo-1522202176988-66273c2fd55f?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80') 
                no-repeat center center/cover;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

/* About Section */
.collab-logo {
    background-color: var(--light);
    font-weight: 600;
    color: var(--primary);
}

.info-card {
    background-color: white;
    border-left: 4px solid var(--secondary);
}

.info-item h5 {
    color: var(--secondary) !important;
}

/* Services Section */
.service-card {
    background-color: white;
    border: none;
    transition: transform 0.3s, box-shadow 0.3s;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1) !important;
}

.service-icon {
    transition: transform 0.3s;
}

.service-card:hover .service-icon {
    transform: scale(1.1);
}

.service-card .fa-chalkboard-teacher,
.service-card .fa-hands-helping,
.service-card .fa-user-graduate {
    color: var(--secondary) !important;
}

/* Portfolio Section */
.portfolio-filter {
    margin-bottom: 2rem;
}

.portfolio-filter .btn {
    margin: 0 5px;
    border-radius: 25px;
    border: 2px solid var(--secondary);
    background-color: white !important;
    color: var(--secondary);
    font-weight: 600;
    padding: 10px 24px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.portfolio-filter .btn:hover {
    background-color: rgba(231,76,60,0.1) !important;
    color: var(--secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(231,76,60,0.2);
}

.portfolio-filter .btn.active {
    background: linear-gradient(135deg, var(--secondary), #c0392b) !important;
    color: white !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(231,76,60,0.3);
}

.portfolio-item {
    height: 200px;
    overflow: hidden;
    border-radius: 8px;
    transition: transform 0.3s;
    cursor: pointer;
    position: relative;
}

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

.portfolio-item img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.3s;
}

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

/* Overlay */
.portfolio-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-category {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--secondary);
    color: white;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* GALERI SECTION - CAROUSEL */
.galeri-section .carousel-inner {
    padding: 20px 0;
}

.galeri-section .carousel-item {
    height: 300px;
    transition: transform 0.5s ease;
}

.galeri-section .carousel-item.active {
    display: flex;
}

.galeri-section .carousel-item-row {
    display: flex;
    width: 100%;
    height: 100%;
    gap: 15px;
    justify-content: center;
    align-items: center;
}

/* Image Container */
.galeri-section .carousel-image-container {
    flex: 1;
    height: 100%;
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.galeri-section .carousel-image-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.galeri-section .carousel-image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.galeri-section .carousel-image-container:hover img {
    transform: scale(1.05);
}

/* Overlay */
.galeri-section .carousel-image-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    color: white;
    padding: 20px 15px 15px;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.galeri-section .carousel-image-container:hover .carousel-image-overlay {
    transform: translateY(0);
}

/* Controls */
.galeri-section .carousel-control-prev,
.galeri-section .carousel-control-next {
    width: 50px;
    height: 50px;
    background: var(--secondary);
    border-radius: 50%;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.8;
    transition: all 0.3s ease;
}

.galeri-section .carousel-control-prev:hover,
.galeri-section .carousel-control-next:hover {
    opacity: 1;
    transform: translateY(-50%) scale(1.1);
}

.galeri-section .carousel-control-prev { left: -25px; }
.galeri-section .carousel-control-next { right: -25px; }

/* Prevent carousel controls from creating horizontal overflow on small screens */
@media (max-width: 768px) {
    .galeri-section .carousel-control-prev { left: 0; }
    .galeri-section .carousel-control-next { right: 0; }
}

/* Indicators */
.galeri-section .carousel-indicators {
    bottom: -50px;
}

.galeri-section .carousel-indicators button {
    width: 12px;
    height: 12px;
    background-color: var(--secondary);
    border-radius: 50%;
    opacity: 0.5;
    transition: all 0.3s ease;
}

.galeri-section .carousel-indicators button.active {
    opacity: 1;
    transform: scale(1.2);
}

/* Contact Section */
.contact-form .form-control {
    border: 1px solid #495057;
    background-color: rgba(255,255,255,0.1);
    /* color: white; */
}

.contact-form .form-control::placeholder {
    color: #adb5bd;
}

.contact-form .form-control:focus {
    background-color: rgba(255,255,255,0.15);
    border-color: var(--secondary);
    /* color: white; */
    box-shadow: 0 0 0 0.2rem rgba(231,76,60,0.25);
}

.social-icon {
    transition: all 0.3s;
    color: var(--secondary) !important;
    border-color: var(--secondary) !important;
}

.social-icon:hover {
    background-color: var(--secondary) !important;
    color: white !important;
}

/* Buttons */
.btn-primary {
    background-color: var(--secondary) !important;
    border-color: var(--secondary) !important;
}

.btn-primary:hover {
    background-color: #c0392b !important;
    border-color: #c0392b !important;
}

.btn-outline-primary {
    color: var(--secondary) !important;
    border-color: var(--secondary) !important;
}

.btn-outline-primary:hover {
    background-color: var(--secondary) !important;
    color: white !important;
}

/* Modal Styles */
.modal-content.bg-transparent .btn-close {
    filter: invert(1);
}

/* Footer Styles */
footer {
    background-color: #1a252f !important;
    margin-top: auto;
}

footer .text-light {
    color: #e9ecef !important;
}

footer a.text-light {
    color: #e9ecef !important;
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a.text-light:hover {
    color: var(--secondary) !important;
    text-decoration: underline;
}

footer .text-primary {
    color: var(--secondary) !important;
}

footer h4, footer h5 {
    color: white !important;
}

footer ul li {
    margin-bottom: 0.5rem;
}

footer hr {
    border-color: #34495e !important;
}

/* Social Icons */
footer .fa-instagram,
footer .fa-tiktok,
footer .fa-youtube {
    transition: color 0.3s ease, transform 0.3s ease;
}

footer .fa-instagram:hover { color: #E1306C !important; transform: scale(1.1); }
footer .fa-tiktok:hover { color: #69C9D0 !important; transform: scale(1.1); }
footer .fa-youtube:hover { color: #FF0000 !important; transform: scale(1.1); }

/* Tablet Medium */
@media (max-width: 768px) {
    body { padding-top: 66px; }

    .hero-section h1 { font-size: 2.5rem !important; }
    .hero-section h2 { font-size: 1.8rem !important; }

    .portfolio-filter .btn {
        margin: 5px;
        width: 100%;
    }

    footer .col-lg-4,
    footer .col-lg-2,
    footer .col-lg-3 {
        margin-bottom: 2rem;
    }
}

/* Mobile */
@media (max-width: 576px) {
    .hero-section h1 { font-size: 2rem !important; }
    .hero-section h2 { font-size: 1.5rem !important; }
    footer { text-align: center; }
    footer .d-flex.gap-3 { justify-content: center; }
}