/* 
Theme Name: Congress Theme
Theme URI: https://seninsite.com
Author: Sen
Description: Custom theme for International Congress 2025
Version: 1.0 
*/



/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #334155;
    background-color: #f8fafc;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: #1e293b;
}

.nav-desktop {
    display: flex;
    gap: 2rem;
}

.nav-desktop .nav-link {
    padding: 0.5rem 0.75rem;
    text-decoration: none;
    color: #64748b;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    border-bottom: 2px solid transparent;
}

.nav-desktop .nav-link:hover,
.nav-desktop .nav-link.active {
    color: #1d4ed8;
    border-bottom-color: #1d4ed8;
}

.mobile-menu-btn {
    display: block;
    background: none;
    border: none;
    padding: 0.5rem;
    color: #64748b;
    cursor: pointer;
}

.mobile-menu-btn:hover {
    color: #1e293b;
}
/* 
.nav-mobile {
    display: none;
    position: fixed;       
    top: 0;
    left: 0;
    width: 100%;           
    height: 50%;         
    background: white;
    z-index: 999;          
    padding-top: 2rem;    
    flex-direction: column;
}  */


.menu-toggle:checked ~ .nav-mobile {
    display: flex;         /* show menu as flex column */
}

.nav-link-mobile {
    padding: 1.5rem;
    font-size: 1.2rem;
    text-align: center;
}

.nav-mobile {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-top: 1px solid #e2e8f0;
}

.nav-mobile.active {
    display: block;
}

.nav-mobile nav {
    padding: 1rem 0;
}

.nav-link-mobile {
    display: block;
    width: 100%;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    color: #64748b;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.nav-link-mobile:hover,
.nav-link-mobile.active {
    color: #1d4ed8;
    background-color: #dbeafe;
}


.menu-toggle {
  display: none; /* hide the checkbox */
}

/* Show mobile menu when checkbox is checked */
.menu-toggle:checked ~ .nav-mobile {
  display: block;
}

/* Optional: hide desktop nav on small screens */
@media (max-width: 500px) {
  .nav-desktop {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }
}

.mobile-menu-btn {
    position: fixed;       /* keep hamburger on top */
    top: 1rem;
    right: 1rem;
    z-index: 100;         /* above menu links */
}


/* Section Styles */
section {
    padding: 4rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.25rem;
    color: #64748b;
    max-width: 48rem;
    margin: 0 auto;
}

/* Hero Section */
.hero {
    padding-top: 8rem;
    padding-bottom: 3rem;
    background: linear-gradient(135deg, #f8fafc 0%, #dbeafe 100%);
}

.hero-content {
    text-align: center;
    padding: 4rem;
}

.hero-title {
    font-size: 2rem;
    font-weight: 100;
    color: #1e293b;
    margin-bottom: 1.5rem;
}

.hero-title-accent {
    display: block;
    color: #1d4ed8;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: #64748b;
    margin-bottom: 2rem;
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
}

.hero-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
    color: #475569;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
}

.info-item i {
    color: #1d4ed8;
    width: 1.25rem;
    height: 1.25rem;
}

.announcement-banner {
    background: #1d4ed8;
    color: white;
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.announcement-content {
    text-align: center;
}

.announcement-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.announcement-content p {
    color: #bfdbfe;
}

.poster-placeholder {
    background: white;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    text-align: center;
}

.placeholder-content {
    border: 2px dashed #cbd5e1;
    border-radius: 0.5rem;
    padding: 3rem 1.5rem;
}

.placeholder-icon {
    width: 4rem;
    height: 4rem;
    background: #f1f5f9;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.placeholder-icon i {
    width: 2rem;
    height: 2rem;
    color: #94a3b8;
}

.placeholder-content h4 {
    font-weight: 500;
    color: #64748b;
    margin-bottom: 0.5rem;
}

.placeholder-content p {
    font-size: 0.875rem;
    color: #94a3b8;
}

/* About Section */
.about {
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.feature-card {
    text-align: center;
}

.feature-icon {
    width: 4rem;
    height: 4rem;
    background: #dbeafe;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.feature-icon i {
    width: 2rem;
    height: 2rem;
    color: #1d4ed8;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: #64748b;
}

.about-description {
    background: #f8fafc;
    border-radius: 0.5rem;
    padding: 2rem;
}

.about-description p {
    margin-bottom: 1rem;
    color: #475569;
}

.about-description p:last-child {
    margin-bottom: 0;
}

/* Dates Section */
.dates {
    background: #f8fafc;
}

.timeline {
    max-width: 64rem;
    margin: 0 auto;
}

.timeline-item {
    position: relative;
    display: flex;
    align-items: flex-start;
    margin-bottom: 2rem;
}

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

.timeline-item::after {
    content: '';
    position: absolute;
    left: 1.5rem;
    top: 3rem;
    width: 1px;
    height: 2rem;
    background: #cbd5e1;
}

.timeline-item:last-child::after {
    display: none;
}

.timeline-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.timeline-icon.completed {
    background: #dcfce7;
    color: #16a34a;
}

.timeline-icon.upcoming {
    background: #dbeafe;
    color: #1d4ed8;
}

.timeline-icon i {
    width: 1.5rem;
    height: 1.5rem;
}

.timeline-content {
    margin-left: 1.5rem;
    flex-grow: 1;
    background: white;
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
}

.timeline-header {
    display: flex;
    flex-direction: column;
    margin-bottom: 0.5rem;
}

.timeline-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #1e293b;
}

.timeline-date {
    font-size: 0.875rem;
    font-weight: 500;
    color: #64748b;
    margin-top: 0.25rem;
}

.timeline-content p {
    color: #64748b;
}

/* Boards Section */
.boards {
    background: white;
}

.boards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.board-card {
    background: white;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
    padding: 1.5rem;
}

.board-header {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.board-icon {
    width: 2.5rem;
    height: 2.5rem;
    background: #dbeafe;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 0.75rem;
}

.board-icon i {
    width: 1.25rem;
    height: 1.25rem;
    color: #1d4ed8;
}

.board-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1e293b;
}

.board-members {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.member {
    padding-bottom: 1rem;
    border-bottom: 1px solid #f1f5f9;
}

.member:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.member h4 {
    font-weight: 500;
    color: #1e293b;
}

.member-title {
    color: #1d4ed8;
    font-size: 0.875rem;
    font-weight: 500;
}

.member-affiliation {
    color: #64748b;
    font-size: 0.875rem;
}

.member a {
    color: #2563eb;
    font-size: 0.875rem;
    text-decoration: none;
    transition: color 0.2s ease;
}

.member a:hover {
    color: #1d4ed8;
}

/* Authors Section */
.callforpapers {
    background: #f8fafc;
}

.submission-types {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.submission-card {
    background: white;
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
}

.submission-icon {
    width: 3rem;
    height: 3rem;
    background: #dbeafe;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.submission-icon i {
    width: 1.5rem;
    height: 1.5rem;
    color: #1d4ed8;
}

.submission-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.submission-card > p {
    color: #64748b;
    margin-bottom: 1rem;
}

.submission-deadline {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    color: #64748b;
    margin-bottom: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #f1f5f9;
}

.submission-deadline i {
    width: 1rem;
    height: 1rem;
}

.submission-requirements {
    list-style: none;
}

.submission-requirements li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: #64748b;
    margin-bottom: 0.25rem;
}

.submission-requirements i {
    width: 1rem;
    height: 1rem;
    color: #10b981;
    margin-top: 0.125rem;
    flex-shrink: 0;
}

.guidelines-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.guideline-card {
    background: white;
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
}

.guideline-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 1rem;
}

.guideline-card ul {
    list-style: none;
}

.guideline-card li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: #64748b;
    margin-bottom: 0.5rem;
}

.guideline-card li::before {
    content: '';
    width: 0.375rem;
    height: 0.375rem;
    background: #2563eb;
    border-radius: 50%;
    margin-top: 0.5rem;
    flex-shrink: 0;
}

.templates-section {
    background: white;
    border-radius: 0.5rem;
    padding: 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
}

.templates-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 1.5rem;
    text-align: center;
}

.templates-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.template-card {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: #f8fafc;
    border-radius: 0.5rem;
}

.template-card i {
    width: 2rem;
    height: 2rem;
    color: #1d4ed8;
    margin-right: 1rem;
}

.template-card h4 {
    font-weight: 500;
    color: #1e293b;
}

.template-card p {
    font-size: 0.875rem;
    color: #64748b;
}

.download-btn {
    color: #2563eb;
    font-size: 0.875rem;
    font-weight: 500;
    margin-top: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.2s ease;
}

.download-btn:hover {
    color: #1d4ed8;
}

/* Calendar Section */
.calendar {
    background: white;
}

.schedule {
    margin-bottom: 3rem;
}

.day-schedule {
    margin-bottom: 3rem;
}

.day-schedule:last-child {
    margin-bottom: 0;
}

.day-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.day-title + div {
    height: 1px;
    background: #e2e8f0;
    margin-bottom: 1.5rem;
}

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

.event {
  display: grid;
  grid-template-columns: 160px 1fr 200px; /* sol - orta - sağ */
  gap: 2rem;
  padding: 1rem;
  margin-bottom: 1.5rem;
  background: #fff;
  border-radius: 0.75rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  align-items: start;
}

.event.keynote {
    border-left-color: #3b82f6;
    background: #eff6ff;
}

.event.session {
    border-left-color: #10b981;
    background: #f0fdf4;
}

.event.poster {
    border-left-color: #8b5cf6;
    background: #faf5ff;
}

.event.panel {
    border-left-color: #f59e0b;
    background: #fffbeb;
}

.event.workshop {
    border-left-color: #ec4899;
    background: #fdf2f8;
}

.event.social {
    border-left-color: #ef4444;
    background: #fef2f2;
}

.event.break,
.event.registration {
    border-left-color: #94a3b8;
    background: #f8fafc;
}

.event-time {
  font-weight: bold;
  color: #004466;
  text-align: right;
}

.event-time i {
    width: 1rem;
    height: 1rem;
}

.event-details h4 {
  margin: 0 0 0.5rem;
  color: #222;
}

.event-details ul {
  margin: 0.5rem 0 0;
  padding-left: 1.2rem;
  font-size: 0.9rem;
}

.event-speaker,
.event-location {
  font-style: italic;
  color: #555;
}

.event-speaker:last-child,
.event-location:last-child {
    margin-bottom: 0;
}

.event-speaker i,
.event-location i {
    width: 1rem;
    height: 1rem;
}

.event-type {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    margin-top: 0.5rem;
}

.event.keynote .event-type {
    background: #dbeafe;
    color: #1e40af;
}

.event.session .event-type {
    background: #dcfce7;
    color: #166534;
}

.event.poster .event-type {
    background: #f3e8ff;
    color: #7c3aed;
}

.event.panel .event-type {
    background: #fef3c7;
    color: #d97706;
}

.event.workshop .event-type {
    background: #fce7f3;
    color: #be185d;
}

.event.social .event-type {
    background: #fee2e2;
    color: #dc2626;
}

.event.break .event-type,
.event.registration .event-type {
    background: #f1f5f9;
    color: #475569;
}

.program-download {
    background: #f8fafc;
    border-radius: 0.5rem;
    padding: 1.5rem;
    text-align: center;
}

.program-download h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 1rem;
}

.program-download p {
    color: #64748b;
    margin-bottom: 1rem;
}

.download-program-btn {
    background: #1d4ed8;
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 0.5rem;
    border: none;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.download-program-btn:hover {
    background: #1e40af;
}

/* Contact Section */
.contact {
    background: #f8fafc;
}

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

.contact-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 1.5rem;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
}

.contact-icon {
    width: 3rem;
    height: 3rem;
    background: #dbeafe;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1rem;
    flex-shrink: 0;
}

.contact-icon i {
    width: 1.5rem;
    height: 1.5rem;
    color: #1d4ed8;
}

.contact-item h4 {
    font-weight: 500;
    color: #1e293b;
}

.contact-item p {
    color: #64748b;
}

.quick-links {
    background: white;
    border-radius: 0.5rem;
    padding: 1.5rem;
    border: 1px solid #e2e8f0;
}

.quick-links h4 {
    font-weight: 500;
    color: #1e293b;
    margin-bottom: 0.75rem;
}

.quick-links-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.contact-form-container {
    background: white;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
    padding: 1.5rem;
}

.contact-form-container h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 1.5rem;
}

.success-message {
    text-align: center;
    padding: 2rem;
}

.success-message i {
    width: 4rem;
    height: 4rem;
    color: #10b981;
    margin: 0 auto 1rem;
}

.success-message h4 {
    font-size: 1.125rem;
    font-weight: 500;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.success-message p {
    color: #64748b;
}

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

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

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.25rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.5rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    resize: none;
}

.submit-btn {
    width: 100%;
    background: #1d4ed8;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    border: none;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.submit-btn:hover {
    background: #1e40af;
}

.submit-btn i {
    width: 1rem;
    height: 1rem;
}

/* Footer */
.footer {
    background: #1e293b;
    color: white;
    padding: 3rem 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.footer-section h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-section h5 {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.footer-section p {
    color: #cbd5e1;
    margin-bottom: 1rem;
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: #cbd5e1;
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-contact-item i {
    width: 1rem;
    height: 1rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.footer-links a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.2s ease;
}

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

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: #cbd5e1;
    margin-bottom: 1.5rem;
}

.newsletter p {
    font-size: 0.75rem;
    color: #94a3b8;
}

.footer-bottom {
    border-top: 1px solid #475569;
    padding-top: 2rem;
    margin-top: 2rem;
    text-align: center;
    font-size: 0.875rem;
    color: #94a3b8;
}

/* Responsive Design */
@media (min-width: 640px) {
    .container {
        padding: 0 1.5rem;
    }

    .hero-info {
        flex-direction: row;
        justify-content: center;
    }

    .timeline-header {
        flex-direction: row;
        align-items: center;
        justify-content: between;
    }

    .timeline-date {
        margin-top: 0;
        margin-left: 1rem;
    }

    .templates-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .event {
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .event-details {
        flex-grow: 1;
    }

    .event-type {
        margin-top: 0;
        margin-left: 1rem;
    }
}

@media (min-width: 768px) {
    .nav-desktop {
        display: flex;
    }

    .mobile-menu-btn {
        display: none;
    }

    .hero-title {
        font-size: 4rem;
    }

    .hero-subtitle {
        font-size: 1.75rem;
    }

    .section-header h2 {
        font-size: 3rem;
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .boards-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .submission-types {
        grid-template-columns: repeat(3, 1fr);
    }

    .guidelines-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .contact-content {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 2rem;
    }

    section {
        padding: 5rem 0;
    }

    .hero {
        padding-top: 10rem;
        padding-bottom: 4rem;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Icon styling for Lucide */
[data-lucide] {
    stroke-width: 2;
}


/* ===== THEMES & SUB-THEMES STYLING ===== */

.themes {
  margin: 50px auto;
  max-width: 900px;
  line-height: 1.7;
  font-family: 'Inter', sans-serif;
}

.themes h2 {
  font-size: 1.8rem;
  margin-top: 30px;
  color: #2c3e50;
  border-bottom: 2px solid #3498db;
  padding-bottom: 8px;
}

.themes h4 {
  margin-top: 25px;
  color: #34495e;
  font-size: 1.3rem;
}

.main-themes {
  counter-reset: main-counter;
  padding-left: 20px;
}

.main-themes li {
  margin: 10px 0;
  font-weight: 500;
  counter-increment: main-counter;
  list-style: none;
  position: relative;
  padding-left: 35px;
}

.main-themes li::before {
  content: counter(main-counter) ". ";
  position: absolute;
  left: 0;
  top: 0;
  color: #3498db;
  font-weight: bold;
}

.sub-themes {
  padding-left: 20px;
}

.sub-themes li {
  margin: 8px 0;
  padding-left: 25px;
  position: relative;
  list-style: none;
}

.sub-themes li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: #27ae60;
  font-size: 1.2rem;
}

/* ==== CONGRESS SECTIONS (COLORFUL VERSION) ==== */
.congress-section {
  max-width: 900px;
  margin: 50px auto;
  padding: 30px;
  background: linear-gradient(135deg, #fdfbfb, #ebedee);
  border-radius: 16px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  font-family: 'Segoe UI', Arial, sans-serif;
  line-height: 1.7;
  color: #333;
  transition: transform 0.3s ease;
}

.congress-section:hover {
  transform: translateY(-5px);
}

.congress-section h2.participation {
  font-size: 1.8rem;
  color: #2c3e50;
  margin-top: 30px;
  margin-bottom: 12px;
  border-bottom: 2px solid #3498db;
  padding-bottom: 8px;
  text-shadow: none;
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: unset;
}

.congress-section h4 {
  font-size: 1.3rem;
  color: #00bfff;
  margin-top: 15px;
  margin-bottom: 10px;
  background: linear-gradient(to right, #00bfff, #1e90ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.congress-section p {
  margin-bottom: 15px;
  color: #444;
}

.congress-section .fees {
  list-style-type: none;
  padding-left: 0;
}

.congress-section .fees li {
  background: linear-gradient(90deg, #b2feff, #101e9d);
  margin: 8px 0;
  padding: 12px 16px;
  border-radius: 10px;
  font-weight: 500;
  display: flex;
  justify-content: space-between;
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.congress-section .fees li:hover {
  transform: translateX(5px);
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.congress-section .fees span {
  font-weight: bold;
  color: #22cbff;
}

.congress-section .note {
  font-size: 0.9rem;
  font-style: italic;
  color: #777;
}

.congress-section .services {
  list-style: none;
  padding-left: 0;
}

.congress-section .services li {
  margin: 8px 0;
  padding-left: 30px;
  position: relative;
  font-weight: 500;
  color: #444;
  transition: color 0.3s;
}

.congress-section .services li:hover {
  color: #40a9ff;
}

.congress-section .services li::before {
  content: "✔";
  position: absolute;
  left: 0;
  color: #4caf50;
  font-weight: bold;
  transform: scale(1.2);
}

.responsive-img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto; /* ortalamak için */
}

.nav-mobile {
  display: none;
  flex-direction: column;
  background: white; /* renk sana kalmış */
  position: absolute;
  top: 70px; /* header yüksekliği kadar */
  left: 0;
  width: 100%;
  padding: 1rem;
}

.nav-mobile.active {
  display: flex;
}


.poster-section {
  padding: 4rem 2rem;
  background-color: #f9f9f9;
  color: #1f2937;
  font-family: 'Inter', Arial, sans-serif;
}

.poster-section .container {
  max-width: 900px;
  margin: 0 auto;
}

.poster-section h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: #1d4ed8;
}

.poster-section h3 {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: #1e40af;
}

.poster-section h4 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: #1e3a8a;
}

.poster-section ul,
.poster-section ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.poster-section li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .poster-section {
    padding: 3rem 1rem;
  }

  .poster-section h2 {
    font-size: 1.75rem;
  }

  .poster-section h3 {
    font-size: 1.35rem;
  }

  .poster-section h4 {
    font-size: 1.15rem;
  }
}

.photo-section {
  text-align: center;
  padding: 60px 20px;
  background: #f8f9fa;
}
.photo-section h2 {
  font-size: 2em;
  margin-bottom: 30px;
  font-weight: 600;
}

.slider {
  position: relative;
  overflow: hidden;
  max-width: 900px;
  margin: 0 auto;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

/* Slider container */
.slides {
  display: flex;
  transition: transform 0.5s ease;
}

/* Her bir slide */
.slide {
  flex-shrink: 0;
  width: 100%;
  height: 500px;               /* Slider yüksekliği */
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #f5f5f5;
  position: relative;
  overflow: hidden;            /* taşmaları gizle */
}

/* Resimler */
.slide img {
  max-width: 100%;
  max-height: 100%;
  width: auto;                 /* genişlik ihtiyaca göre */
  height: auto;                /* yükseklik ihtiyaca göre */
  object-fit: contain;         /* kutuya sığdır ve oranı koru */
  display: block;
}

/* Download butonu */
.download-btn {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.6);
  color: white;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.9em;
  text-decoration: none;
  transition: background 0.3s;
}
.download-btn:hover {
  background: rgba(0,0,0,0.8);
}

/* Slider okları */
.prev, .next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0,0,0,0.4);
  color: white;
  border: none;
  padding: 10px;
  border-radius: 50%;
  cursor: pointer;
}
.prev { left: 15px; }
.next { right: 15px; }
.prev:hover, .next:hover { background: rgba(0,0,0,0.6); }

/* Lightbox */
#lightbox {
  display: none;
  position: fixed;
  z-index: 999;
  left: 0; top: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.8);
  justify-content: center;
  align-items: center;
}
#lightbox img {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  border-radius: 12px;
}
#lightbox .close {
  position: absolute;
  top: 30px;
  right: 50px;
  color: white;
  font-size: 2em;
  cursor: pointer;
}
.lb-prev, .lb-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.2);
  border: none;
  color: white;
  font-size: 3em;
  padding: 0 10px;
  border-radius: 10px;
  cursor: pointer;
  user-select: none;
}
.lb-prev:hover, .lb-next:hover { background: rgba(255,255,255,0.4); }
.lb-prev { left: 40px; }
.lb-next { right: 40px; }





/* Responsive */
@media (max-width: 768px) {
  .photo-section h2 { font-size: 1.5em; }
  .download-btn { font-size: 0.8em; }
}



@media (max-width: 900px) {
  .event {
    grid-template-columns: 140px 1fr;
  }
  .event-location {
    grid-column: 1 / span 2;
    margin-top: 0.5rem;
  }
}

/* Mobil (tek sütun) */
@media (max-width: 600px) {
  .event {
    grid-template-columns: 1fr;
  }
  .event-time {
    text-align: left;
    margin-bottom: 0.5rem;
  }
  .event-location {
    grid-column: auto;
    margin-top: 0.5rem;
  }
}