:root {
    --primary-blue: #2C6FB7;
    --deep-green: #1F5A2E;
    --accent-yellow: #F2C21A;
}

body {
    background-color: #E6E6E6;
}

/* Navbar */
#mainNavbar {
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* Brand Styling */
.brand-main {
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: 1px;
    color: #0d3b66;
}

.brand-sub {
    font-size: 0.7rem;
    color: rgba(13, 59, 102, 0.75);
    line-height: 1.1;
}

/* Nav links */
.nav-link {
    color: #0d3b66 !important;
    font-weight: 600;
    position: relative;
}

/* Underline animation */
.nav-animate::after {
    content: "";
    position: absolute;
    width: 0%;
    height: 2px;
    left: 0;
    bottom: 0;
    background-color: var(--accent-yellow);
    transition: 0.3s;
}

.nav-animate:hover::after {
    width: 100%;
}

/* Accent button */
.btn-accent {
    background-color: var(--accent-yellow);
    color: #000;
    border-radius: 30px;
}

.btn-accent:hover {
    background-color: #e0b217;
}

/* Scroll state */
.navbar-scrolled {
    background: white !important;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.navbar-scrolled .nav-link,
.navbar-scrolled .brand-main {
    color: var(--primary-blue) !important;
}

.navbar-scrolled .brand-sub {
    color: var(--deep-green) !important;
}

.hero-section {
    min-height: 100vh;
    background: 
        linear-gradient(rgba(255,255,255,0.35),rgba(255,255,255,0.35)),
        url("../../image/hero-image.png");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    position: relative;
}
/* .hero-section {
    min-height: 100vh;
    background: linear-gradient(135deg, #2C6FB7, #1F5A2E);
    padding-top: 120px;
}

.hero-section p {
    font-size: 1.1rem;
}

.hero-logo {
    max-width: 800px;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
}

.highlight {
    color: #F2C21A;
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
} */

.btn-submit {
    background-color: #00d4aa;
    color: #fff;
    border-radius: 40px;
    padding: 10px 28px;
    font-weight: 600;
    border: none;
    transition: 0.3s;
}

.btn-submit:hover {
    background-color: #00b894;
    transform: scale(1.05);
}


.event-meta {
    display: inline-flex;
    gap: 25px;
    padding: 12px 25px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    border-radius: 50px;
    color: #ffffff;
    font-weight: 500;
}

.event-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.event-item svg {
    opacity: 0.9;
}

/* ABOUT SECTION */
.about-section {
    background: #f3f3f3;
}

.section-title {
    font-weight: 700;
    color: #0d3b66;
}

.about-text {
    color: #555;
    line-height: 1.9;
    margin-bottom: 18px;
}

/* SUB THEME CARD */
.theme-card {
    background: #ffffff;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    height: 100%;
}

.theme-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.08);
}

.theme-number {
    font-weight: 800;
    font-size: 28px;
    color: #f2b705; /* kuning dari palette */
    margin-bottom: 10px;
}

.theme-title {
    font-weight: 600;
    color: #1d3557;
    line-height: 1.4;
}

/* IMPORTANT DATES SECTION */
.dates-section {
    background: #0d3b66;
    color: #ffffff;
}

.dates-title {
    font-weight: 700;
    color: #ffffff;
}
/* SNAKE TIMELINE */
.snake-timeline {
    position: relative;
    width: 100%;
}

.snake-item {
    position: relative;
    width: 50%;
    padding: 10px 20px;
    margin-bottom: 20px;
}

.snake-item.left {
    left: 0;
    text-align: right;
}

.snake-item.right {
    left: 50%;
}

.snake-content {
    background: rgba(255,255,255,0.08);
    padding: 20px;
    border-radius: 15px;
    backdrop-filter: blur(6px);
    position: relative;
}

.snake-content h6 {
    font-weight: 600;
    margin-bottom: 5px;
}

.snake-content p {
    margin: 0;
    opacity: 0.85;
}

.snake-content.highlight {
    background: #2ec4b6;
    color: #0d3b66;
}

/* Vertical Center Line */
.snake-timeline::before {
    content: "";
    position: absolute;
    left: 50%;
    width: 3px;
    height: 100%;
    background: rgba(255,255,255,0.2);
    transform: translateX(-50%);
}

/* Dot */
.snake-item::before {
    content: "";
    position: absolute;
    top: 25px;
    width: 16px;
    height: 16px;
    background: #f2b705;
    border-radius: 50%;
    z-index: 2;
}

.snake-item.left::before {
    right: -8px;
}

.snake-item.right::before {
    left: -8px;
}

/* Responsive */
@media (max-width: 768px) {
    .snake-item,
    .snake-item.left,
    .snake-item.right {
        width: 100%;
        left: 0;
        text-align: left;
    }

    .snake-timeline::before {
        left: 20px;
    }

    .snake-item::before {
        left: 12px;
    }
}

/* SPEAKERS SECTION */
.speakers-section {
    background: #f8f9fa;
}

.section-subtitle {
    color: #6c757d;
    margin-top: 10px;
}

/* CARD */
.speaker-card {
    background: #ffffff;
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    height: 100%;
}

.speaker-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 18px 40px rgba(0,0,0,0.08);
}

/* IMAGE */
.speaker-image {
    position: relative;
    overflow: hidden;
}

.speaker-image img {
    width: 100%;
    height: 350px;
    object-fit: cover;
    object-position: top center;
}

/* BADGE */
.speaker-badge {
    position: absolute;
    top: 15px;
    left: 15px;
    background: #f2b705;
    color: #0d3b66;
    font-weight: 600;
    font-size: 12px;
    padding: 6px 12px;
    border-radius: 30px;
}

/* INFO */
.speaker-info {
    padding: 20px;
}

.speaker-info h5 {
    font-weight: 600;
    margin-bottom: 6px;
    color: #0d3b66;
}

.speaker-info p {
    margin: 0;
    color: #6c757d;
    font-size: 14px;
}

/* footer */
.footer-minimal {
    background: linear-gradient(135deg, #0d3b66 0%, #1d3557 50%, #2ec4b6 100%);
    color: #ffffff;
    padding: 50px 0;
    position: relative;
    overflow: hidden;
}

/* Optional subtle overlay texture effect */
.footer-minimal::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.05), transparent 40%),
                radial-gradient(circle at 80% 70%, rgba(255,255,255,0.05), transparent 40%);
    pointer-events: none;
}

.footer-logo-wrapper {
    margin: 25px 0;
}

.footer-logo {
    max-width: 250px;
    opacity: 0.9;
    transition: 0.3s ease;
}

.footer-logo:hover {
    opacity: 1;
    transform: scale(1.05);
}

.footer-copy {
    font-size: 14px;
    color: rgba(255,255,255,0.85);
    letter-spacing: 0.5px;
}

.top-copy {
    margin-bottom: 10px;
}

.bottom-copy {
    margin-top: 10px;
}

/* submit */
.submit-section {
    background: linear-gradient(135deg, #f0f4f8, #e6eef5);
}

.submit-card {
    background: #ffffff;
    padding: 50px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
}

.submit-title {
    font-weight: 700;
    color: #0F3057;
}

.submit-subtitle {
    color: #6c757d;
    font-size: 0.95rem;
}

.custom-input {
    border-radius: 12px;
    padding: 12px 15px;
    border: 1px solid #dce3ec;
    transition: all 0.3s ease;
}

.custom-input:focus {
    border-color: #0F3057;
    box-shadow: 0 0 0 0.2rem rgba(15, 48, 87, 0.1);
}

.upload-box {
    position: relative;
    border: 2px dashed #c8d6e5;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: 0.3s;
}

.upload-box:hover {
    border-color: #0F3057;
    background: rgba(15, 48, 87, 0.03);
}

.upload-box input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.upload-box span {
    color: #6c757d;
    font-size: 0.9rem;
}

.submit-btn {
    padding: 12px 40px;
    border-radius: 50px;
    border: none;
    background: linear-gradient(135deg, #0F3057, #00587A);
    color: white;
    font-weight: 600;
    transition: 0.3s;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(15, 48, 87, 0.3);
}

.btn-icoseg {
    background: linear-gradient(135deg, #F4B400, #FF8F00);
    border: none;
    border-radius: 10px;
    padding: 10px 20px;
    color: white;
    font-weight: 600;
}

.btn-icoseg:hover {
    opacity: 0.9;
}

/* CALL FOR PAPERS SECTION */
.call-section {
    background: linear-gradient(135deg, #ffffff, #f3f6fb);
}

.call-subtitle {
    color: #6c757d;
    font-size: 1rem;
}

.call-card {
    background: #ffffff;
    padding: 45px;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.05);
    line-height: 1.9;
    color: #555;
}

.call-card p {
    margin-bottom: 18px;
}

.call-theme {
    font-weight: 700;
    color: #0d3b66;
}

.call-highlight {
    background: linear-gradient(135deg, #2C6FB7, #1F5A2E);
    color: #ffffff;
    padding: 20px;
    border-radius: 15px;
    font-weight: 500;
}

/* PARTNERS SECTION */
.partners-section {
    background: #ffffff;
}

.partner-wrapper {
    background: #f8f9fa;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.05);
}

.partner-image {
    max-width: 100%;
    transition: 0.4s ease;
}

.partner-image:hover {
    transform: scale(1.02);
}

/* AUTHOR GUIDELINES PAGE */

.guidelines-hero {
    background: linear-gradient(135deg, #0d3b66, #1f5a2e);
    color: white;
}

.guidelines-title {
    font-weight: 700;
    font-size: 2.5rem;
}

.guidelines-subtitle {
    opacity: 0.9;
}

.guidelines-section {
    background: #f4f6f9;
}

.guidelines-card {
    background: #ffffff;
    padding: 50px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
    line-height: 1.9;
    color: #444;
}

.guidelines-card h5 {
    font-weight: 700;
    margin-top: 25px;
    color: #0d3b66;
}

.guidelines-card hr {
    margin: 30px 0;
    opacity: 0.1;
}

.page-section {
    padding-top: 140px; /* sesuaikan sama tinggi navbar lo */
    padding-bottom: 80px;
}

/* CONTACT PAGE */

.contact-hero {
    background: linear-gradient(135deg, #0d3b66, #1f5a2e);
    color: white;
}

.contact-title {
    font-weight: 700;
    font-size: 2.5rem;
}

.contact-subtitle {
    opacity: 0.9;
}

.contact-section {
    background: #f4f6f9;
}

.contact-card {
    background: #ffffff;
    padding: 60px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

.contact-item {
    margin-bottom: 35px;
}

.contact-item h5 {
    font-weight: 700;
    color: #0d3b66;
}

.contact-item p {
    font-size: 1.1rem;
    margin: 5px 0 0;
    color: #555;
}