/* ========================================
   Sections - About, Organization, Sponsor, Speakers, Program, Footer
   ======================================== */

/* ---- Links Section (버튼 영역) ---- */
.links-section {
  padding: var(--spacing-md) 0;
  background-color: var(--color-bg-gray);
}

.links-section__buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.links-section__btn {
  min-width: 180px;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-lg);
}

/* ---- About ---- */
.about {
  background-color: var(--color-bg);
}

.about__text {
  font-size: var(--font-size-base);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.about__text strong {
  color: var(--color-primary);
}

/* About 미디어 (이미지/비디오/유튜브) */
.about__media {
  margin-top: var(--spacing-lg);
}

.about__media:empty {
  display: none;
}

.about__image {
  width: 100%;
  border-radius: var(--border-radius);
}

.about__video {
  width: 100%;
  border-radius: var(--border-radius);
}

.about__youtube {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--border-radius);
}

/* ---- 주최/주관/후원 공통 ---- */
.hosts {
  background-color: var(--color-bg-gray);
}

.hosts__group {
  margin-bottom: var(--spacing-lg);
}

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

.hosts__group {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.hosts__label {
  flex-shrink: 0;
  width: 60px;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text-light);
  text-align: right;
}

.hosts__group .logo-grid {
  flex: 1;
  justify-content: center;
}



/* ---- Organization ---- */
.org {
  background-color: var(--color-bg);
}

.org__group {
  margin-bottom: var(--spacing-xl);
}

.org__group .grid {
  justify-content: center;
}

.org__group-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
  text-align: center;
}

/* ---- Sponsor ---- */
.sponsor {
  background-color: var(--color-bg-gray);
}

.sponsor__logos {
  margin-bottom: var(--spacing-xl);
}

.sponsor__members {
  margin-bottom: var(--spacing-lg);
}

.sponsor__title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
}

/* ---- Speakers ---- */
.speaker {
  background-color: #1a1a1a;
}

.speaker__section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text-white);
}

.speaker__group {
  margin-bottom: var(--spacing-xl);
}

.speaker__spacer {
  height: 60px;
}

.speaker__title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  text-align: center;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-white);
}

.speaker__subtitle {
  font-size: var(--font-size-sm);
  text-align: center;
  margin-bottom: var(--spacing-lg);
  color: #888;
}

.speaker .card__name {
  color: var(--color-text-white);
}

.speaker .card__desc {
  color: #aaa;
}

/* ---- Program ---- */
.program {
  background-color: var(--color-bg);
}

/* 헤더 */
.program__header {
  text-align: center;
  margin-bottom: 50px;
}

.program__category {
  font-size: 18px;
  font-style: italic;
  color: #6B7FD3;
  margin-bottom: 10px;
}

.program__title {
  font-size: 42px;
  font-weight: 700;
  color: #222;
  margin-bottom: 15px;
  letter-spacing: -0.5px;
}

.program__venue {
  font-size: 16px;
  font-weight: 500;
  color: #333;
  margin-bottom: 12px;
}

.program__notice {
  font-size: 14px;
  color: #888;
}

/* 탭 */
.program__tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 50px;
  background-color: #e5e5e5;
  border-radius: 30px;
  padding: 5px;
  max-width: 280px;
  margin-left: auto;
  margin-right: auto;
}

.program__tab {
  flex: 1;
  padding: 12px 30px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: #888;
  border-radius: 25px;
  transition: all 0.3s ease;
}

.program__tab--active {
  background-color: #fff;
  color: #333;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* Day 콘텐츠 */
.program__day {
  display: none;
}

.program__day--active {
  display: block;
}

.program__day-wrapper {
  display: flex;
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.program__date {
  writing-mode: vertical-lr;
  text-orientation: mixed;
  font-size: 15px;
  font-weight: 500;
  color: #333;
  padding-top: 45px;
  flex-shrink: 0;
  letter-spacing: 2px;
}

.program__list {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.program__item {
  margin-bottom: 40px;
}

.program__time {
  font-size: 14px;
  color: #999;
  margin-bottom: 8px;
  margin-left: 5px;
}

.program__session {
  background-color: #e8e8e8;
  padding: 16px 24px;
  border-radius: 4px;
  width: 100%;
}

.program__session--blue {
  background: linear-gradient(90deg, #5B7FD3 0%, #7B9FE3 100%);
  color: var(--color-text-white);
}

.program__session--navy {
  background: linear-gradient(90deg, #2C3E50 0%, #34495E 100%);
  color: var(--color-text-white);
}

.program__session--red {
  background: linear-gradient(90deg, #E74C3C 0%, #EC7063 100%);
  color: var(--color-text-white);
}

.program__session--gray {
  background: #888;
  color: var(--color-text-white);
}

.program__session-title {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.3px;
}

.program__session-subtitle {
  font-size: 17px;
  font-weight: 500;
  margin-left: 30px;
}

.program__info {
  padding: 18px 20px 10px 45%;
}

.program__speakers,
.program__note {
  text-align: left;
}

.program__speaker {
  font-size: 16px;
  color: #333;
  margin-bottom: 8px;
  line-height: 1.8;
}

.program__speaker strong,
.program__speaker b {
  font-weight: 700;
}

.program__note {
  font-size: 14px;
  color: #666;
}

/* 반응형 */
@media (max-width: 767px) {
  .program__day-wrapper {
    flex-direction: column;
  }
  
  .program__date {
    writing-mode: horizontal-tb;
    padding-top: 0;
    margin-bottom: var(--spacing-sm);
  }
}

/* ---- Footer ---- */
.footer {
  background-color: #BDBDBD;
  color: var(--color-text);
  padding: var(--spacing-lg) 0;
}

.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.footer__info {
  text-align: left;
}

.footer__title {
  font-size: var(--font-size-sm);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.footer__item {
  font-size: var(--font-size-sm);
  line-height: 1.8;
  opacity: 0.9;
}

.footer__copyright {
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

/* 반응형 푸터 */
@media (max-width: 767px) {
  .footer__content {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
  
  .footer__copyright {
    align-self: flex-end;
  }
}

/* 반응형 */
@media (min-width: 768px) {
  .about__text {
    font-size: var(--font-size-lg);
  }
  
  .program__item {
    flex-direction: row;
    align-items: flex-start;
  }
  
  .program__time {
    min-width: 80px;
  }
  
  .program__content {
    flex: 1;
  }
}