* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    overflow-x: hidden;
}
/* =========================================
 Design System Setup & CSS Variables
   ========================================= */
:root {
    /* Color Palette based on your image */
    --primary-color: #0d2b56;
    /* Deep Navy Blue */
    --secondary-color: #1a3c70;
    /* Lighter Navy */
    --accent-color: #00c4cc;
    /* Teal/Cyan Button Color */
    --text-dark: #212529;
    --text-light: #f8f9fa;
    --text-grey: #6c757d;
    --light-bg: #f4f7fa;
    --white: #fff;
    /* Typography */
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Roboto', sans-serif;
}

body {
    font-family: var(--font-body);
    color: var(--text-dark);
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--primary-color);
}

/* --- Global Utilities --- */
.section-padding {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    margin: 15px auto 0;
    border-radius: 2px;
}

.btn-custom {
    background-color: var(--accent-color);
    color: #fff;
    padding: 10px 25px;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
}

.btn-custom:hover {
    background-color: #009aa0;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 196, 204, 0.4);
}

.btn-outline-custom {
    border: 2px solid #fff;
    color: #fff;
    padding: 10px 25px;
    border-radius: 30px;
    font-weight: 600;
    background: transparent;
    transition: all 0.3s;
}

.btn-outline-custom:hover {
    background: #fff;
    color: var(--primary-color);
}

/* --- Navbar --- */
.navbar {
    background-color: var(--primary-color);
    padding: 15px 0;
    transition: all 0.3s;
}

.navbar-brand {
    font-family: var(--font-heading);
    font-weight: 700;
    color: #fff !important;
    font-size: 1.5rem;
}

.nav-link {
    color: rgba(255, 255, 255, 0.8) !important;
    font-weight: 500;
    margin: 0 10px;
    transition: color 0.3s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-color) !important;
}

/* --- Hero Section --- */
.hero-section {
    background: linear-gradient(135deg, rgba(13, 43, 86, 0.95), rgba(13, 43, 86, 0.8)), url('../images/banner-bg.jpg');
    background-size: cover;
    background-position: center;
    color: #fff;
    padding: 120px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
    color: #fff;
}

.hero-logo {
    max-width: 150px;
    background: #fff;
    border-radius: 50%;
    padding: 10px;
    margin-bottom: 20px;
}
.springer-logo{
    max-width: 250px;
    margin-top: 20px;
}
/* --- About Section --- */
.about-img {
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    width: 100%;
    object-fit: cover;
}

/* --- Call For Papers (Cards) --- */
/* --- Trendy Card Design --- */
.trendy-card {
    background: #fff;
    border-radius: 20px;
    padding: 40px 30px;
    position: relative;
    overflow: hidden;
    transition: all 0.4s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.05);
    z-index: 1;
}

.trendy-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transition: height 0.3s ease;
    z-index: -1;
}

.trendy-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(13, 43, 86, 0.15);
}

.trendy-card:hover::before {
    height: 100%;
    opacity: 0.05;
}

.trendy-icon-box {
    width: 70px;
    height: 70px;
    background: rgba(0, 196, 204, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    transition: all 0.3s;
}

.trendy-card:hover .trendy-icon-box {
    background: var(--accent-color);
    color: #fff;
}

.trendy-icon {
    font-size: 1.8rem;
    color: var(--accent-color);
    transition: all 0.3s;
}

.trendy-card:hover .trendy-icon {
    color: #fff;
}

.bg-light {
    background-color: #f8f9fa !important;
}

/* --- Important Dates --- */
.date-box {
    background: var(--primary-color);
    color: #fff;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    margin-bottom: 20px;
    border-bottom: 4px solid var(--accent-color);
}

.date-box h4 {
    color: var(--accent-color);
    font-size: 1.2rem;
}

/* --- Submission --- */
.submission-guidelines ul li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 25px;
}

.submission-guidelines ul li::before {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: var(--accent-color);
    position: absolute;
    left: 0;
    top: 2px;
}

.quick-submission-form {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
    border-top: 5px solid var(--accent-color);
}

#submission .btn-outline-custom {
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    padding: 8px 20px;
    border-radius: 30px;
    font-weight: 600;
    background: transparent;
    transition: all 0.3s;
    margin-right: 10px;
    margin-bottom: 10px;
}

#submission .btn-outline-custom:hover {
    background: var(--accent-color);
    color: #fff;
}

.quick-submission-form .submit-button {
    background-color: var(--accent-color);
    color: #fff;
    padding: 10px 25px;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
}

.quick-submission-form .submit-button:hover {
    background-color: var(--accent-hover);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 196, 204, 0.4);
}


/* --- Registration Table --- */
.pricing-table {
    width: 100%;
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
}

.pricing-table thead {
    background: var(--secondary-color);
    color: #fff;
}

.pricing-table th,
.pricing-table td {
    padding: 15px;
    text-align: center;
    border-bottom: 1px solid #eee;
}

/* --- Speaker Card Styles --- */
.speaker-card {
    text-align: center;
    background: #fff;
    padding: 30px 20px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: 0.3s;
}

.speaker-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.speaker-img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 15px;
    border: 4px solid var(--light-bg);
}

.speaker-name {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 5px;
    font-family: var(--font-heading);
}

.speaker-prof {
    color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 500;
}

/* --- Organizing Committee Specific Styles --- */
.committee-box h5 {
    color: var(--accent-color);
    margin-top: 20px;
    border-left: 3px solid var(--primary-color);
    padding-left: 10px;
    font-family: var(--font-heading);
    font-weight: 600;
}

.committee-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: 20px;
}

.committee-list li {
    margin-bottom: 5px;
    color: #555;
}

.bg-light {
    background-color: #f8f9fa !important;
}

/* Review Committee Scrollable Area */
.review-container {
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 0.5rem;
    max-height: 200px;
    overflow-y: auto;
}

/* --- Registration Table --- */
.pricing-table {
    width: 100%;
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.pricing-table thead {
    background: var(--primary-color);
    color: #fff;
}

.pricing-table th,
.pricing-table td {
    padding: 15px;
    text-align: center;
    border-bottom: 1px solid #eee;
}

/* --- Payment Info Box --- */
.payment-info-box {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    border-left: 5px solid var(--accent-color);
    height: 100%;
}

.payment-info-box i {
    color: #6c757d;
    /* secondary color */
}

.alert-info {
    background-color: #cff4fc;
    border-color: #b6effb;
    color: #055160;
    padding: 1rem;
    border-radius: 0.25rem;
}

.fee-includes {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px var(--shadow);
    margin-top: 2rem;
}

.fee-includes h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.fee-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.fee-list li {
    padding: 0.5rem 0;
    color: var(--text-grey);
    display: flex;
    align-items: flex-start;
}

.fee-list li i {
    color: var(--accent-color);
    margin-right: 0.75rem;
    margin-top: 0.25rem;
}

.payment-info-box i {
    color: var(--accent-color);
}

/* --- Footer --- */
/* --- Footer Styling --- */
footer {
    background-color: #0a1d37;
    color: #ffffff;
    padding: 60px 0 20px;
}

footer h5 {
    color: var(--accent-color);
    font-weight: 700;
    font-family: var(--font-heading);
    position: relative;
    padding-bottom: 10px;
}

footer h5::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 30px;
    height: 2px;
    background: var(--accent-color);
}

footer p, footer address {
    font-size: 0.95rem;
    line-height: 1.6;
    opacity: 0.8;
}

.footer-address {
    font-style: normal;
}

/* --- Map Container Fix --- */
.ratio-16x9 {
    border: 1px solid rgba(255,255,255,0.1);
    filter: grayscale(100%) invert(90%) contrast(90%); /* Optional: Matches dark theme */
    transition: 0.3s;
}

.ratio-16x9:hover {
    filter: none;
}

.copyright {
    letter-spacing: 1px;
}

/* --- Contact Link Styling --- */
.footer-contact-link {
    color: inherit;
    text-decoration: none;
    transition: 0.3s;
}

.footer-contact-link:hover {
    color: var(--accent-color);
}
/* Mobile Adjustments */
@media (max-width: 1199px) {
    .nav-link {
        font-size: 13px;
    }
}
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .section-padding {
        padding: 50px 0;
    }
}