* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #005aa8;
  --background-light: #f5f7f8;
  --background-dark: #0f1a23;
  --text-dark: #0c151d;
  --slate-50: #f8fafc;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--background-light);
  color: var(--text-dark);
  line-height: 1.5;
}

.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* Header */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(245, 247, 248, 0.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--slate-200);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-img {
  height: 60px;
  width: auto;
}

.nav-menu {
  display: none;
  gap: 2rem;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-dark);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn {
  cursor: pointer;
  border: none;
  border-radius: 0.5rem;
  font-weight: 700;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-icon {
  height: 2.5rem;
  padding: 0 0.625rem;
  background-color: var(--slate-200);
  color: var(--text-dark);
}

.btn-primary {
  height: 2.5rem;
  padding: 0 1rem;
  background-color: var(--primary);
  color: white;
  font-size: 0.875rem;
}

.btn-primary:hover {
  background-color: #004a8f;
}

.btn-menu {
  height: 2.5rem;
  padding: 0 0.625rem;
  background-color: transparent;
  color: var(--text-dark);
}

/* Hero Section */
.hero {
  min-height: 600px;
  background-image: linear-gradient(to top, rgba(0, 90, 168, 0.6) 0%, rgba(245, 247, 248, 0.1) 100%), 
                    url("./img/banner2.png");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  text-align: center;
}

.hero-content {
  max-width: 56rem;
}

.hero-title {
  color: white;
  font-size: 2.25rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero-subtitle {
  color: white;
  font-size: 1rem;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.btn-lg {
  height: 3rem;
  padding: 0 1.25rem;
  font-size: 1rem;
}

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

.btn-outline {
  background-color: transparent;
  color: white;
  border: 1px solid white;
}

/* Timer Section */
.timer-section {
  background-color: #f1f5f9;
  padding: 1.5rem 0;
}

.timer-container {
  max-width: 36rem;
  margin: 0 auto;
  padding: 0 1rem;
}

.timer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.timer-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.timer-box {
  height: 4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: white;
  border-radius: 0.5rem;
}

.timer-number {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-dark);
}

.timer-label {
  text-align: center;
  font-size: 0.875rem;
  color: var(--slate-600);
}

/* Introduction Section */
.intro-section {
  padding: 4rem 1rem;
}

.section-container {
  max-width: 80rem;
  margin: 0 auto;
}

.intro-grid {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.section-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 1rem;
}

.section-text {
  color: var(--slate-600);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.intro-features {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

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

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

.intro-images {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.intro-img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 0.5rem;
}

/* Topics Section */
.topics-section {
  padding: 4rem 1rem;
  background-color: #f1f5f9;
}

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

.section-description {
  max-width: 42rem;
  margin: 1rem auto 0;
  color: var(--slate-600);
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

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

.topic-icon-wrapper {
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.5rem;
  background-color: rgba(0, 90, 168, 0.2);
  margin-bottom: 1rem;
}

.topic-icon {
  color: var(--primary);
  font-size: 1.875rem;
}

.topic-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
}

.topic-description {
  font-size: 0.875rem;
  color: var(--slate-600);
}

/* Important Dates Section */
.dates-section {
  padding: 4rem 1rem;
}

.dates-timeline {
  position: relative;
  padding-top: 2rem;
}

.timeline-line {
  display: none;
  position: absolute;
  top: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--slate-300);
}

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

.date-item {
  position: relative;
  text-align: center;
}

.date-marker {
  display: none;
  position: absolute;
  top: -2.75rem;
  left: 50%;
  transform: translateX(-50%);
  width: 1.25rem;
  height: 1.25rem;
  background-color: var(--primary);
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.date-marker-inner {
  width: 0.5rem;
  height: 0.5rem;
  background-color: white;
  border-radius: 50%;
}

.date-value {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.date-label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dark);
}

/* Speakers Section */
.speakers-section {
  padding: 4rem 1rem;
  background-color: #f1f5f9;
}

.speakers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.speaker-card {
  background-color: white;
  padding: 1.5rem;
  border-radius: 0.5rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  text-align: center;
}

.speaker-img {
  width: 7rem;
  height: 7rem;
  border-radius: 50%;
  margin: 0 auto 1rem;
  object-fit: cover;
}

.speaker-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.25rem;
}

.speaker-affiliation {
  font-size: 0.875rem;
  color: var(--primary);
}

/* Responsive Design */
@media (min-width: 640px) {
  .header-container {
    padding: 0.75rem 1.5rem;
  }
  
  .btn-register-mobile {
    display: inline-flex;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .hero-subtitle {
    font-size: 1.25rem;
  }
  
  .intro-section, .topics-section, .dates-section, .speakers-section {
    padding: 6rem 1.5rem;
  }
  
  .section-title {
    font-size: 2.25rem;
  }
}

@media (min-width: 768px) {
  .nav-menu {
    display: flex;
  }
  
  .btn-menu {
    display: none;
  }
  
  .intro-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .timeline-line {
    display: block;
  }
  
  .date-marker {
    display: flex;
  }
}

@media (min-width: 1024px) {
  .header-container {
    padding: 0.75rem 2rem;
  }
  
  .topics-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .dates-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

.hidden-mobile {
  display: none;
}

@media (min-width: 640px) {
  .hidden-mobile {
    display: inline-flex;
  }
}

@media (max-width: 767px) {
  .show-mobile {
    display: inline-flex;
  }
}
/*CSS popup*/
/* Popup overlay */
#popup-form {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 9999;
    justify-content: center;
    align-items: center;
}

/* Popup box */
.popup-box {
    width: 90%;
    max-width: 800px;
    background: white;
    padding: 20px;
    border-radius: 10px;
    position: relative;
}

/* Close button */
.popup-close {
    position: absolute;
    top: 10px;
    right: 10px;
    background: red;
    color: white;
    border: none;
    padding: 6px 10px;
    cursor: pointer;
    border-radius: 4px;
}
/*CSS ban lãnh đạo*/
.organizing-committee {
  background: #f8fafc;
  padding: 60px 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont;
}

.container {
  width: min(1100px, 90%);
  margin: auto;
}

.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-header h2 {
  font-size: 28px;
  margin-bottom: 10px;
}

.section-header p {
  color: #64748b;
}

.committee-block {
  margin-bottom: 40px;
}

.block-title {
  font-size: 20px;
  margin-bottom: 20px;
  color: #0f172a;
}

/* ===== Executive Cards ===== */
.executive-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.person-card {
  background: #fff;
  border-radius: 14px;
  padding: 16px;
  display: flex;
  gap: 14px;
  box-shadow: 0 6px 20px rgba(0,0,0,.05);
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #2563eb;
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 600;
  font-size: 14px;
}

.person-card h4 {
  margin: 0;
  font-size: 16px;
}

.person-card p {
  margin: 4px 0;
  font-weight: 500;
}

.person-card span {
  font-size: 13px;
  color: #64748b;
}

/* ===== Accordion ===== */
.accordion {
  background: #fff;
  border-radius: 12px;
  margin-bottom: 14px;
  box-shadow: 0 4px 16px rgba(0,0,0,.04);
  padding: 10px 16px;
}

.accordion summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.accordion ul {
  padding-left: 16px;
  margin-top: 12px;
}

.accordion li {
  margin-bottom: 12px;
  font-size: 14px;
}

.accordion a {
  color: #2563eb;
  text-decoration: none;
}
/*thu gọn hàng*/
/* ============================= */
/*  TOGGLE BAN CHUYÊN MÔN        */
/* ============================= */

/* Mặc định: ẩn toàn bộ card */
.executive-grid.limited .person-card {
  display: none;
}

/* Mobile: 1 cột → 2 hàng = 4 card */
@media (max-width: 767px) {
  .executive-grid.limited .person-card:nth-child(-n+4) {
    display: flex;
  }
}

/* Tablet: 2 cột → 2 hàng = 4 card */
@media (min-width: 768px) and (max-width: 1023px) {
  .executive-grid.limited .person-card:nth-child(-n+4) {
    display: flex;
  }
}

/* Desktop: 3 cột → 2 hàng = 6 card */
@media (min-width: 1024px) {
  .executive-grid.limited .person-card:nth-child(-n+6) {
    display: flex;
  }
}

/* ============================= */
/*  BUTTON XEM THÊM              */
/* ============================= */
.show-more-wrapper {
  text-align: center;
  margin-top: 20px;
}

.show-more-btn {
  background: #2563eb;
  color: #fff;
  border: none;
  padding: 10px 22px;
  border-radius: 999px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.25s ease;
}

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

/*end*/
/*Slider*/
.partners-slider {
  overflow: hidden;
  padding: 20px 0;
}

.partners-track {
  display: flex;
  width: max-content;
  animation: marquee 30s linear infinite;
}

@keyframes marquee {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

/* pause khi hover */
.partners-slider:hover .partners-track {
  animation-play-state: paused;
}

/* Khung logo cố định */
.partner-item {
  width: 160px;          /* desktop */
  height: 80px;
  background: white;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  box-shadow: 0 4px 14px rgba(0,0,0,.06);
  margin-left: 20px;
}

/* Logo tự scale đúng tỉ lệ */
.partner-item img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
@media (max-width: 640px) {
  .partner-item {
    width: 120px;
    height: 60px;
    padding: 8px;
  }
}


/*end*/
/* ===== Thông tin liên hệ ===== */
/* ============================= */
/*  VENUE & CONTACT SECTION     */
/* ============================= */

.venue-section {
  background: #f8fafc;
  padding: 60px 1rem;
}

.venue-grid {
  display: grid;
  gap: 32px;
  margin-top: 40px;
}

/* LEFT */
.venue-info {
  background: white;
  padding: 32px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,.06);
}

.venue-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
}

.venue-address {
  font-size: 15px;
  color: var(--slate-600);
  line-height: 1.6;
  margin-bottom: 24px;
}

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

.venue-contact li {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 15px;
}

.venue-contact span {
  color: var(--primary);
  font-size: 22px;
}

.venue-contact a {
  color: var(--text-dark);
  text-decoration: none;
}

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

/* RIGHT */
.venue-map {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,.06);
}

.venue-map iframe {
  width: 100%;
  height: 100%;
  min-height: 320px;
  border: 0;
}

/* RESPONSIVE */
@media (min-width: 768px) {
  .venue-grid {
    grid-template-columns: 1.1fr 1fr;
    align-items: stretch;
  }
}

/*end*/
/* ===== Desktop ===== */
@media (min-width: 768px) {
  .executive-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .executive-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.pkp_structure_page {
    margin: 0 auto;
    max-width: 1480px;
    background: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
@media (min-width: 1200px) {
    .pkp_structure_page {
        /* margin-top: 2.143rem; */
        /* margin-bottom: 2.143rem; */
    }
}
@media (min-width: 1200px) {
    .pkp_site_name_wrapper, .pkp_navigation_primary_wrapper, .pkp_navigation_user, .pkp_search_mobile, .pkp_structure_content, .pkp_structure_footer {
        width: 1480px;
    }
}

html, body {
    background: #dddddd00;
}
@media (min-width: 1200px) {
    .pkp_structure_main {
        width: 1180px;
    }
}
@media (min-width: 1200px) {
    .has_site_logo .pkp_head_wrapper {
        width: 1480px;
    }
}
.pkp_brand_footer{
    display: none;
}

body, 
h1, h2, h3, h4, h5, h6,
p, div, a,
input, textarea, button,
table, th, td {
    font-family: sans-serif !important;
}
#navigationPrimary a {color: rgb(0 0 0);}
.pkp_block .title{color: rgb(0 0 0);}
a {
    color: #233a99;
}
.pkp_structure_main h2{
        font-size: 1.7rem;
}
.pkp_footer_content{
        font-size: 1.2rem;
}