/* ═══════════════════════════════════════════════
   FLOW FREEDIVING — Section Layouts
   Header · Hero · WHY FLOW · Finder · Programs
   Instructor · Reviews · Gallery · FAQ · CTA · Footer
   ═══════════════════════════════════════════════ */

/* ═══════ HEADER ═══════ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: transparent;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.header.is-scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--light-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--section-px);
}

.header__logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: var(--fw-extrabold);
  letter-spacing: var(--ls-wider);
  color: var(--white);
  text-transform: uppercase;
}

.header__logo span {
  font-weight: var(--fw-light);
  color: var(--text-secondary);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.header__link {
  font-size: var(--fs-caption);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  transition: color var(--transition-fast);
  position: relative;
}

.header__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition-base);
}

.header__link:hover,
.header__link.is-active {
  color: var(--white);
}

.header__link:hover::after,
.header__link.is-active::after {
  width: 100%;
}

/* Header scrolled dark text */
.header.is-scrolled .header__logo {
  color: var(--light-text-primary);
}

.header.is-scrolled .header__logo span {
  color: var(--light-text-tertiary);
}

.header.is-scrolled .header__link {
  color: var(--light-text-secondary);
}

.header.is-scrolled .header__link:hover,
.header.is-scrolled .header__link.is-active {
  color: var(--light-text-primary);
}

.header.is-scrolled .header__link::after {
  background: var(--light-accent);
}

.header.is-scrolled .header__toggle span {
  background: var(--light-text-primary);
}

/* ═══════ SUBPAGE / LIGHT HEADER ═══════ */
/* 서브페이지에서는 스크롤 위치(scrollY = 0 포함)와 관계없이 항상 밝은 배경 + 다크 네이비 텍스트 유지 */
.header--subpage,
.header--light {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--light-border);
}

.header--subpage .header__logo,
.header--light .header__logo {
  color: var(--light-text-primary);
}

.header--subpage .header__logo span,
.header--light .header__logo span {
  color: var(--light-text-tertiary);
}

.header--subpage .header__link,
.header--light .header__link {
  color: var(--light-text-secondary);
}

.header--subpage .header__link:hover,
.header--subpage .header__link.is-active,
.header--light .header__link:hover,
.header--light .header__link.is-active {
  color: var(--light-text-primary);
}

.header--subpage .header__link::after,
.header--light .header__link::after {
  background: var(--light-accent);
}

.header--subpage .header__toggle span,
.header--light .header__toggle span {
  background: var(--light-text-primary);
}

.header__cta {
  margin-left: var(--space-6);
}

/* Mobile Toggle */
.header__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 24px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px 0;
}

.header__toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--white);
  transition: all var(--transition-base);
  transform-origin: center;
}

.header__toggle.is-active span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 5px);
}
.header__toggle.is-active span:nth-child(2) {
  opacity: 0;
}
.header__toggle.is-active span:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -5px);
}

/* Mobile Drawer */
.mobile-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-deeper);
  z-index: var(--z-drawer);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-overlay.is-active {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(320px, 85vw);
  height: 100vh;
  background: var(--dark-ocean);
  z-index: calc(var(--z-drawer) + 1);
  padding: var(--space-24) var(--space-8) var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  transform: translateX(100%);
  transition: transform var(--transition-base);
}

.mobile-drawer.is-active {
  transform: translateX(0);
}

.mobile-drawer__link {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--fs-h3);
  font-weight: var(--fw-semibold);
  color: var(--text-secondary);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  transition: color var(--transition-fast);
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-drawer__link:hover,
.mobile-drawer__link.is-active {
  color: var(--white);
}

.mobile-drawer__cta {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* ═══════ HERO ═══════ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-color: var(--color-bg-dark, #060b13);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero__video,
.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__video {
  pointer-events: none;
  user-select: none;
}

.hero__video::-webkit-media-controls,
.hero__video::-webkit-media-controls-overlay-play-button,
.hero__video::-webkit-media-controls-container,
.hero__video::-webkit-media-controls-start-playback-button,
.hero__video::-webkit-media-controls-play-button,
.hero__video::-webkit-media-controls-panel,
.hero__video::-webkit-media-controls-enclosure,
.hero__video::-webkit-media-button,
.hero__video::-webkit-media-text-track-container {
  display: none !important;
  -webkit-appearance: none !important;
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: rgba(8, 15, 30, 0.45);
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 var(--section-px);
  max-width: 700px;
}

.hero__title {
  font-size: var(--fs-display);
  font-weight: var(--fw-extrabold);
  color: var(--white);
  line-height: 1.25;
  margin-bottom: var(--space-6);
  letter-spacing: var(--ls-tight);
}

.hero__subtitle {
  font-size: var(--fs-body);
  font-weight: var(--fw-light);
  color: rgba(255, 255, 255, 0.7);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-10);
  white-space: pre-line;
}

.hero__buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-10);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  color: rgba(255, 255, 255, 0.4);
  font-size: var(--fs-small);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  position: relative;
  overflow: hidden;
}

.hero__scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(transparent, var(--accent));
  animation: scrollLine 2s var(--ease-in-out) infinite;
}

@keyframes scrollLine {
  0% { top: -100%; }
  50% { top: 0; }
  100% { top: 100%; }
}

/* ═══════ WHY FLOW ═══════ */
.why-flow {
  background: var(--light-bg);
}

.why-flow__grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-6);
  width: 100%;
  margin: 0 auto;
}

.why-flow__grid .value-card {
  flex: 0 1 calc((100% - (var(--space-6) * 3)) / 4);
  min-width: 220px;
  max-width: 320px;
  box-sizing: border-box;
}

/* ═══════ COURSE FINDER ═══════ */
.course-finder {
  background: var(--light-bg-alt);
  position: relative;
  overflow: hidden;
}

.course-finder::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--light-border), transparent);
}

/* ═══════ PROGRAMS ═══════ */
.programs {
  background: var(--light-bg);
}

.programs__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

/* ═══════ INSTRUCTOR ═══════ */
.instructor-section {
  background: var(--light-bg-alt);
  position: relative;
  overflow: hidden;
}

.instructor-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--light-border), transparent);
}

/* ═══════ REVIEWS ═══════ */
.reviews-section {
  background: var(--light-bg);
}

.reviews-more {
  text-align: center;
  margin-top: var(--space-8);
}

.reviews-more a {
  font-size: var(--fs-caption);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: color var(--transition-fast);
}

.reviews-more a:hover {
  color: var(--accent);
}

.reviews-more a svg {
  width: 14px;
  height: 14px;
}

/* ═══════ GALLERY ═══════ */
.gallery-section {
  background: var(--light-bg-alt);
  position: relative;
}

.gallery-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--light-border), transparent);
}

.gallery__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.gallery-more-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--light-accent, #0F172A);
  text-decoration: none;
  cursor: pointer;
  padding: 4px 0;
  transition: all 0.2s ease;
}

.gallery-more-link:hover {
  color: var(--primary, #0284c7);
  opacity: 0.85;
}

.gallery-more-link:hover .gallery-more-arrow {
  transform: translateX(4px);
}

/* ═══════ FAQ ═══════ */
.faq-section {
  background: var(--light-bg);
}

.faq-section .container {
  max-width: var(--container-narrow);
}

/* ═══════ CTA SECTION ═══════ */
.cta-section {
  background: linear-gradient(
    135deg,
    #111827 0%,
    #1f2937 50%,
    #1c4b73 100%
  );
  text-align: center;
  padding: var(--section-py) 0;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.3;
}

.cta-section__title {
  font-size: var(--fs-h2);
  font-weight: var(--fw-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.cta-section__subtitle {
  font-size: var(--fs-body);
  color: var(--text-secondary);
  margin-bottom: var(--space-10);
}

.cta-section__buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* ═══════ FOOTER ═══════ */
.footer {
  background: #111827;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: var(--space-16) 0 var(--space-8);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 0.8fr;
  gap: var(--space-12);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--section-px);
}

.footer__logo {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: var(--fw-extrabold);
  letter-spacing: var(--ls-wider);
  color: var(--white);
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.footer__logo span {
  font-weight: var(--fw-light);
  color: var(--text-secondary);
}

.footer__slogan {
  font-size: var(--fs-body-sm);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-6);
}

.footer__heading {
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  color: var(--text-primary);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  margin-bottom: var(--space-5);
}

.footer__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__info p {
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
  line-height: var(--lh-normal);
}

.footer__sns-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__sns-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--fs-body-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer__sns-item:hover {
  color: var(--accent);
}

.footer__sns-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.footer__bottom {
  max-width: var(--container-max);
  margin: var(--space-10) auto 0;
  padding: var(--space-6) var(--section-px) 0;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__legal {
  display: flex;
  gap: var(--space-4);
}

.footer__legal a {
  font-size: var(--fs-small);
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
}

.footer__legal a:hover {
  color: var(--text-secondary);
}

.footer__copyright {
  font-size: var(--fs-small);
  color: var(--text-tertiary);
}

.footer__admin-link {
  font-size: var(--fs-small);
  color: var(--text-tertiary);
  opacity: 0.3;
  transition: opacity var(--transition-fast);
}

.footer__admin-link:hover {
  opacity: 1;
  color: var(--text-secondary);
}

/* ── Decorative Elements ── */
.section-divider {
  width: 40px;
  height: 2px;
  background: var(--light-accent);
  margin: 0 auto var(--space-6);
}

/* ═══════ LIGHT SECTION TEXT OVERRIDES ═══════ */
.why-flow .section-title,
.course-finder .section-title,
.programs .section-title,
.instructor-section .section-title,
.reviews-section .section-title,
.gallery-section .section-title,
.faq-section .section-title {
  color: var(--light-text-primary);
}

.why-flow .section-subtitle,
.course-finder .section-subtitle,
.programs .section-subtitle,
.instructor-section .section-subtitle,
.reviews-section .section-subtitle,
.gallery-section .section-subtitle,
.faq-section .section-subtitle {
  color: var(--light-text-secondary);
}