/* ===== CSS Variables ===== */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary: #0f172a;
    --accent: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    --transition: all 0.3s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.btn {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    flex-wrap: wrap;
    text-align: center;
}

.btn span {
    flex: 1;
    min-width: 100px;
    display: block;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.5);
}

.btn-outline {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition);
    padding: 1rem 0;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    padding: 0.75rem 0;
}

.navbar.scrolled .nav-logo,
.navbar.scrolled .nav-menu a,
.navbar.scrolled .lang-btn {
    color: var(--gray-800);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
    transition: var(--transition);
}

.nav-logo i {
    font-size: 1.5rem;
    color: var(--primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-menu a {
    padding: 0.5rem 0.1rem;
    margin: 0 0.2rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-menu a:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f172a 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: #3b82f6;
    top: 10%;
    left: 10%;
    animation: float 8s ease-in-out infinite;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: #8b5cf6;
    bottom: 10%;
    right: 10%;
    animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-30px) scale(1.1); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 8rem 1.5rem 4rem;
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1.25rem;
    border-radius: 2rem;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: #4ade80;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    color: white;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 700px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}

.hero-info {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.75rem 1.25rem;
    border-radius: 2rem;
    color: white;
    font-weight: 500;
}

.info-item i {
    color: #93c5fd;
}

.hero-buttons {
    display: flex;
    flex-wrap: nowrap;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 4rem;
}

.hero-organizers {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-organizers p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
}

.organizers-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

.organizers-list .organizer-logo-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.organizers-list .organizer-logo-item:hover {
    transform: translateY(-5px);
}

.organizers-list .organizer-logo {
    height: 80px;
    width: 150px;
    object-fit: contain;
    opacity: 1;
    transition: var(--transition);
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.3));
}

.organizers-list .organizer-logo:hover {
    opacity: 1;
    transform: scale(1.1);
    filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.4));
}

.organizers-list .organizer-text {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    font-size: 0.8rem;
    text-align: center;
    max-width: 150px;
}

.organizers-list .divider {
    color: rgba(255, 255, 255, 0.3);
    font-size: 2rem;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.5);
    font-size: 1.5rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ===== Section Headers ===== */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-badge {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--gray-900);
}

/* ===== About Section ===== */
.about {
    padding: 6rem 0;
    background: white;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
}

@media (min-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.about-content p {
    font-size: 1.125rem;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.key-dates {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.03) 0%, rgba(99, 102, 241, 0.02) 100%);
    border-radius: var(--radius-xl);
    padding: 2rem;
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.key-dates h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.date-item {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    background: white;
    border: 1px solid rgba(37, 99, 235, 0.08);
    margin-bottom: 1rem;
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}

.date-item:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
    border-color: rgba(37, 99, 235, 0.15);
}

.date-item:last-child {
    margin-bottom: 0;
}

.date-icon {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    color: white;
    flex-shrink: 0;
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.date-icon.blue { background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%); }
.date-icon.amber { background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%); }
.date-icon.green { background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%); }

.date-title {
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.date-subtitle {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: 2rem;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

.feature-card:hover {
    background: var(--primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 3.5rem;
    height: 3.5rem;
    background: var(--primary-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    transition: var(--transition);
}

.feature-icon i {
    font-size: 1.5rem;
    color: var(--primary);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: rgba(255, 255, 255, 0.2);
}

.feature-card:hover .feature-icon i {
    color: white;
}

.feature-card h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
    transition: var(--transition);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.6;
    transition: var(--transition);
}

.feature-card:hover h4,
.feature-card:hover p {
    color: white;
}

/* ===== Sections ===== */
.sections {
    padding: 6rem 0;
    background: var(--gray-50);
}

.sections-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.section-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 2rem;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

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

.section-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary) 0%, #1d4ed8 100%);
    opacity: 0;
    transition: var(--transition);
}

.section-card:hover::before {
    opacity: 1;
}

.section-number {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 4rem;
    font-weight: 800;
    color: var(--gray-100);
    line-height: 1;
    transition: var(--transition);
    z-index: 1;
}

.section-card:hover .section-number {
    color: rgba(255, 255, 255, 0.2);
}

.section-icon {
    width: 4rem;
    height: 4rem;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.section-icon.blue { background: #dbeafe; color: #2563eb; }
.section-icon.green { background: #d1fae5; color: #10b981; }
.section-icon.purple { background: #ede9fe; color: #8b5cf6; }
.section-icon.amber { background: #fef3c7; color: #f59e0b; }

.section-card:hover .section-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.section-icon i {
    font-size: 1.75rem;
}

.section-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.section-card p {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.6;
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.section-card:hover h3,
.section-card:hover p {
    color: white;
}

/* ===== Committees ===== */
.committees {
    padding: 6rem 0;
    background: white;
}

.tabs {
    max-width: 900px;
    margin: 0 auto;
}

.tab-buttons {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--gray-100);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    background: var(--gray-200);
}

.tab-btn.active {
    background: var(--primary);
    color: white;
}

.tab-content {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    border: 1px solid var(--gray-100);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-panel h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    text-align: center;
    margin-bottom: 2rem;
}

.members-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.member-card {
    background: white;
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.member-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.member-name {
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.member-role {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.secretariat-content {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
}

.secretariat-content p {
    color: var(--gray-600);
    line-height: 1.8;
}

/* ===== Participate Section ===== */
.participate-section {
    padding: 6rem 0;
    background: var(--gray-50);
}

/* Participate Intro */
.participate-intro {
    background: white;
    border-radius: var(--radius-xl);
    padding: 3rem;
    margin-bottom: 3rem;
    box-shadow: var(--shadow-md);
}

.intro-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    width: 100%;
}

.intro-content .btn-large {
    width: 100%;
    max-width: 450px;
}

.intro-content h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.intro-content > p {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.intro-content h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 1.5rem 0 1rem;
}

.intro-steps {
    list-style: none;
    margin-bottom: 2rem;
}

.intro-steps li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--gray-700);
    line-height: 1.6;
}

.intro-steps li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: 700;
    font-size: 1.25rem;
}

/* Participate Subsections */
.participate-subsection {
    background: white;
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border-top: 4px solid var(--primary);
}

.participate-subsection h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.subsection-description {
    color: var(--gray-600);
    font-size: 1.125rem;
    margin-bottom: 2rem;
    line-height: 1.6;
}

/* Requirements Grid */
.abstracts-requirements {
    margin: 2rem 0;
}

.abstracts-requirements h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.requirement-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

.req-icon {
    width: 3rem;
    height: 3rem;
    background: var(--primary-light);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.req-icon i {
    color: var(--primary);
    font-size: 1.25rem;
}

.req-info h5 {
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.req-info p {
    font-size: 0.9rem;
    color: var(--gray-600);
    line-height: 1.5;
}

/* Fee Card Enhancements */
.fee-description {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin: 0.5rem 0;
}

.fee-note {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    background: #fef3c7;
    padding: 1rem;
    border-radius: var(--radius);
    border: 1px solid #fcd34d;
    margin-top: 1.5rem;
}

.fee-note i {
    color: var(--warning);
    font-size: 1.25rem;
    margin-top: 0.125rem;
}

.fee-note p {
    font-size: 0.9rem;
    color: #92400e;
}

/* Template Download */
.template-download {
    margin: 2rem 0;
}

.template-download h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.download-card {
    background: linear-gradient(135deg, var(--primary-light) 0%, #f0f4ff 100%);
    border-radius: var(--radius-xl);
    padding: 2rem;
    border: 2px dashed var(--primary);
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: var(--transition);
}

.download-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.download-icon {
    width: 4rem;
    height: 4rem;
    background: var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.download-icon i {
    color: white;
    font-size: 2rem;
}

.download-info {
    flex: 1;
}

.download-info p {
    color: var(--gray-600);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.btn-small {
    padding: 0.85rem 2rem;
    font-size: 0.95rem;
    white-space: nowrap;
}

/* Submission Process */
.submission-process {
    margin-top: 2rem;
}

.submission-process h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.process-card {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    border: 1px solid var(--gray-200);
}

.process-steps {
    margin-bottom: 1.5rem;
}

.process-step {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--gray-200);
}

.process-step:last-child {
    border-bottom: none;
}

.process-step i {
    color: var(--success);
    font-size: 1.5rem;
    margin-top: 0;
}

.process-step p {
    color: var(--gray-700);
    line-height: 1.6;
}

.submission-email {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    margin: 1.5rem 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.submission-email i {
    color: white;
    font-size: 1.5rem;
}

.submission-email a {
    color: white;
    font-weight: 600;
    text-decoration: none;
    font-size: 1.125rem;
}

.submission-email a:hover {
    text-decoration: underline;
}

.process-note {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    background: #fef3c7;
    padding: 1rem;
    border-radius: var(--radius);
    border: 1px solid #fcd34d;
    margin-top: 1rem;
}

.process-note i {
    color: var(--warning);
    font-size: 1.25rem;
    margin-top: 0.125rem;
}

.process-note p {
    font-size: 0.9rem;
    color: #92400e;
}

.registration {
    padding: 6rem 0;
    background: var(--gray-50);
}

.registration-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 3rem;
    box-shadow: var(--shadow-md);
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.registration-icon {
    width: 5rem;
    height: 5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.registration-icon i {
    font-size: 2.5rem;
    color: white;
}

.registration-card h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.registration-card > p {
    color: var(--gray-600);
    font-size: 1.125rem;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.registration-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.step-number {
    width: 3rem;
    height: 3rem;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
}

.step-item p {
    color: var(--gray-700);
    font-size: 0.9rem;
}

.btn-large {
    padding: 1.2rem 2.5rem;
    font-size: 1.05rem;
    margin: 1rem 0 1.5rem;
    width: auto;
}

.btn-large i {
    min-width: 24px;
}

.btn-large span {
    text-align: center;
}

.registration-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--primary-light);
    padding: 1rem;
    border-radius: var(--radius);
    color: var(--primary-dark);
    font-size: 0.9rem;
}

.registration-note i {
    font-size: 1.125rem;
}

.fees-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.fee-card {
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.fee-header {
    height: 6px;
}

.fee-header.blue { background: var(--primary); }
.fee-header.green { background: var(--success); }
.fee-header.purple { background: var(--accent); }

.fee-icon {
    width: 3.5rem;
    height: 3.5rem;
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 1.5rem 1.5rem 1rem;
}

.fee-icon i {
    font-size: 1.5rem;
    color: var(--gray-600);
}

.fee-card h4 {
    padding: 0 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 1rem;
}

.fee-price {
    padding: 0 1.5rem 1.5rem;
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
}

.fee-price .amount {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gray-900);
}

.fee-price .currency {
    font-size: 1.125rem;
    color: var(--gray-500);
    font-weight: 500;
}

.registration-period {
    background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
    border-radius: var(--radius-xl);
    padding: 2rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
}

.period-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: white;
}

.period-icon {
    width: 4rem;
    height: 4rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.period-icon i {
    font-size: 1.75rem;
}

.period-info h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.period-info p {
    opacity: 0.8;
}

.registration-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-bottom: 4rem;
}

.requirements h3,
.submission-process h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.requirement-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: white;
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.requirement-item:hover {
    box-shadow: var(--shadow-md);
}

.req-icon {
    width: 3rem;
    height: 3rem;
    background: var(--primary-light);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.req-icon i {
    color: var(--primary);
    font-size: 1.25rem;
}

.req-info h4 {
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.req-info p {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.process-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    border: 1px solid var(--gray-100);
}

.process-steps {
    margin-bottom: 1.5rem;
}

.process-step {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--gray-100);
}

.process-step:last-child {
    border-bottom: none;
}

.process-step i {
    color: var(--success);
    font-size: 1.25rem;
    margin-top: 0.125rem;
}

.process-step p {
    color: var(--gray-700);
}

.process-note {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    background: #fffbeb;
    padding: 1rem;
    border-radius: var(--radius);
    border: 1px solid #fcd34d;
}

.process-note i {
    color: var(--warning);
    font-size: 1.25rem;
    margin-top: 0.125rem;
}

.process-note p {
    font-size: 0.9rem;
    color: #92400e;
}

/* ===== Fees Section ===== */
.fees-section {
    padding: 6rem 0;
    background: white;
}

/* ===== Abstracts Section ===== */
.abstracts-section {
    padding: 6rem 0;
    background: var(--gray-50);
}

.abstracts-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

.template-download {
    margin: 2rem 0;
}

.template-download h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.download-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 2rem;
    border: 2px dashed var(--gray-200);
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: var(--transition);
}

.download-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.download-icon {
    width: 4rem;
    height: 4rem;
    background: var(--primary-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.download-icon i {
    color: var(--primary);
    font-size: 2rem;
}

.download-info {
    flex: 1;
}

.download-info h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.download-info p {
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.submission-email {
    background: var(--primary-light);
    padding: 1.25rem;
    border-radius: var(--radius);
    text-align: center;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.submission-email i {
    color: var(--primary);
    font-size: 1.25rem;
}

.submission-email a {
    color: var(--primary-dark);
    font-weight: 600;
    text-decoration: none;
    font-size: 1.125rem;
}

.submission-email a:hover {
    text-decoration: underline;
}

.section-description {
    text-align: center;
    color: var(--gray-500);
    font-size: 1.125rem;
    margin-top: 0.5rem;
}

/* ===== Contact ===== */
.contact {
    padding: 6rem 0;
    background: white;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.contact-info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.contact-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    border: 1px solid var(--gray-100);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.contact-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.contact-icon {
    width: 3rem;
    height: 3rem;
    background: var(--primary-light);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.contact-icon i {
    color: var(--primary);
    font-size: 1.25rem;
}

.contact-card h4 {
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.contact-card p,
.contact-card a {
    font-size: 0.9rem;
    color: var(--gray-600);
}

.contact-card a:hover {
    color: var(--primary);
}

.contact-subtitle {
    font-size: 0.8rem;
    color: var(--gray-400);
    margin-top: 0.25rem;
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: 2rem;
    border: 1px solid var(--gray-100);
}

.contact-form-wrapper h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    padding: 0.875rem 1rem;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-status {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: var(--radius);
    display: none;
}

.form-status.success {
    display: block;
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.form-status.error {
    display: block;
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.emailjs-instruction {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    background: #eff6ff;
    padding: 1rem;
    border-radius: var(--radius);
    margin-top: 1.5rem;
    border: 1px solid #bfdbfe;
}

.emailjs-instruction i {
    color: var(--primary);
    font-size: 1.25rem;
    margin-top: 0.125rem;
}

.emailjs-instruction p {
    font-size: 0.9rem;
    color: var(--gray-700);
}

/* Location Map */
.location-map {
    margin-top: 3rem;
}

.map-placeholder {
    background: var(--gray-100);
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    border: 2px dashed var(--gray-200);
}

.map-placeholder i {
    font-size: 3rem;
    color: var(--gray-400);
    margin-bottom: 1rem;
}

.map-placeholder h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.map-placeholder p {
    color: var(--gray-500);
}

.map-subtitle {
    font-size: 0.9rem;
    color: var(--gray-400);
    margin-top: 0.5rem;
}

/* ===== Footer ===== */
.footer {
    background: var(--gray-900);
    color: white;
    padding: 4rem 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    padding-bottom: 3rem;
}

.footer-about h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-about p {
    color: var(--gray-400);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.footer-badges {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.badge {
    background: rgba(37, 99, 235, 0.2);
    color: #93c5fd;
    padding: 0.375rem 0.875rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.badge-green {
    background: rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.footer-links ul li,
.footer-contact ul li {
    margin-bottom: 0.75rem;
}

.footer-links ul li a {
    color: var(--gray-400);
    transition: var(--transition);
}

.footer-links ul li a:hover {
    color: white;
}

.footer-contact ul li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--gray-400);
}

.footer-contact ul li i {
    color: var(--primary);
    width: 1rem;
}

.footer-contact ul li a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding: 1.5rem 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.footer-bottom p {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.footer-organizers {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--gray-500);
    font-size: 0.875rem;
}

.footer-organizers .divider {
    color: var(--gray-700);
}

/* ===== Mobile Responsive ===== */
@media (max-width: 1024px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        gap: 0.5rem;
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        opacity: 0;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
    }

    .nav-menu a {
        color: var(--gray-800);
        padding: 0.75rem 1rem;
        width: 100%;
        border-radius: var(--radius);
    }

    .nav-menu a:hover {
        background: var(--gray-100);
    }

    .mobile-toggle {
        display: block;
    }

    .navbar.scrolled .mobile-toggle {
        color: var(--gray-800);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-info {
        flex-direction: column;
        align-items: center;
    }

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

    .btn {
        width: auto;
        padding: 0.8rem 1.8rem;
        font-size: 0.9rem;
    }

    .btn-large {
        width: auto;
        padding: 0.9rem 2rem;
        font-size: 0.95rem;
    }

    .organizers-list {
        flex-direction: column;
        gap: 1.5rem;
    }

    .organizers-list .organizer-logo {
        height: 60px;
        width: 120px;
    }

    .organizers-list .organizer-text {
        font-size: 0.75rem;
    }

    .organizers-list .divider {
        display: none;
    }

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

    .tab-btn {
        width: 100%;
        justify-content: center;
    }

    .registration-card {
        padding: 2rem 1.5rem;
    }

    .registration-steps {
        grid-template-columns: 1fr;
    }

    .registration-period {
        flex-direction: column;
    }

    .download-card {
        flex-direction: column;
        text-align: center;
    }

    .download-icon {
        margin: 0 auto;
    }

    .abstracts-content,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .footer-organizers {
        flex-direction: column;
    }

    .footer-organizers .divider {
        display: none;
    }

    /* Participate Section Mobile */
    .participate-intro,
    .participate-subsection {
        padding: 2rem 1.5rem;
        margin-bottom: 1.5rem;
    }

    .intro-content h3 {
        font-size: 1.5rem;
    }

    .intro-content > p {
        font-size: 1rem;
    }

    .intro-steps li {
        font-size: 0.95rem;
    }

    .participate-subsection h3 {
        font-size: 1.25rem;
    }

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

    .requirement-item {
        flex-direction: column;
        text-align: center;
    }

    .req-icon {
        width: 2.5rem;
        height: 2.5rem;
        margin: 0 auto;
    }

    .req-icon i {
        font-size: 1rem;
    }

    .download-card {
        flex-direction: column;
        text-align: center;
    }

    .download-icon {
        width: 3rem;
        height: 3rem;
    }

    .download-icon i {
        font-size: 1.5rem;
    }

    .process-step {
        gap: 0.5rem;
    }

    .process-step i {
        font-size: 1.25rem;
    }

    .submission-email {
        flex-direction: column;
        padding: 1.25rem;
    }

    .submission-email a {
        font-size: 1rem;
    }
}

/* ===== Scroll Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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