/* ==========================================================
   LAYOUT — Header, Footer, Navigation, Grid
   phamducanh.vn
   ========================================================== */

/* ── Header / Navigation ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding: var(--space-5) 0;
  transition: all var(--transition-base);
}

.site-header.scrolled {
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: var(--space-3) 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--white);
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  line-height: 1.2;
}

.logo-text span {
  display: block;
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--ocean-300);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

/* Main Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
}

.nav-cta {
  margin-left: var(--space-4);
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--coral-500), var(--coral-400));
  color: var(--white);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-coral);
  color: var(--white);
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: calc(var(--z-overlay) + 1);
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ── Footer ── */
.site-footer {
  background: var(--navy-950);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-20) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
}

.footer-brand {
  max-width: 360px;
}

.footer-brand .logo {
  margin-bottom: var(--space-6);
}

.footer-brand-desc {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-6);
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--space-6);
}

.footer-links {
  list-style: none;
  padding: 0;
}

.footer-links li {
  margin-bottom: var(--space-3);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.5);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--ocean-300);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.35);
}

.footer-legal a {
  color: rgba(255, 255, 255, 0.35);
  margin-left: var(--space-6);
}

.footer-legal a:hover {
  color: var(--ocean-300);
}

/* ── Grid Layouts ── */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

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

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

/* ── Two Column Content ── */
.content-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.content-split-reverse {
  direction: rtl;
}

.content-split-reverse > * {
  direction: ltr;
}

.content-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}

.content-img img {
  width: 100%;
  height: auto;
  display: block;
}

.content-img-accent {
  position: absolute;
  bottom: -20px;
  right: -20px;
  width: 120px;
  height: 120px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--ocean-400), var(--ocean-300));
  opacity: 0.2;
  z-index: -1;
}

/* ── Page Header (sub-pages) ── */
.page-header {
  background: linear-gradient(180deg, var(--navy-950) 0%, var(--navy-800) 100%);
  padding: calc(var(--space-32) + 80px) 0 var(--space-16);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: radial-gradient(ellipse at top right, rgba(0, 119, 182, 0.15), transparent 60%);
}

.page-breadcrumb {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-6);
}

.page-breadcrumb a {
  color: rgba(255, 255, 255, 0.5);
}

.page-breadcrumb a:hover {
  color: var(--ocean-300);
}

.page-breadcrumb .separator {
  color: rgba(255, 255, 255, 0.3);
}

.page-title {
  font-size: var(--text-5xl);
  font-weight: var(--weight-extrabold);
  margin-bottom: var(--space-6);
}

.page-desc {
  font-size: var(--text-xl);
  color: rgba(255, 255, 255, 0.7);
  max-width: 60ch;
  line-height: var(--leading-relaxed);
}

/* ── Back to Top ── */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--navy-800);
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: var(--z-sticky);
  font-size: 1.2rem;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--ocean-500);
  transform: translateY(-3px);
}

/* ==========================================================
   VIDEO SHOWCASE — Cinematic fullscreen autoplay video
   ========================================================== */
.video-showcase-wrapper {
  position: relative;
  width: 100%;
  height: 60vh;
  min-height: 400px;
  max-height: 700px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.video-showcase-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.video-showcase-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(6, 14, 26, 0.85) 0%,
    rgba(6, 14, 26, 0.5) 50%,
    rgba(6, 14, 26, 0.15) 100%
  );
  z-index: 1;
}

.video-showcase-content {
  position: relative;
  z-index: 2;
  padding: var(--space-12) var(--space-8);
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
}

@media (max-width: 768px) {
  .video-showcase-wrapper {
    height: 50vh;
    min-height: 300px;
  }
  .video-showcase-overlay {
    background: linear-gradient(
      180deg,
      rgba(6, 14, 26, 0.3) 0%,
      rgba(6, 14, 26, 0.8) 100%
    );
  }
  .video-showcase-content {
    padding: var(--space-8) var(--space-6);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    height: 100%;
  }
}

/* ==========================================================
   MARATHON GALLERY — Asymmetric photo grid + stats
   ========================================================== */
.marathon-gallery {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-6);
  margin-top: var(--space-12);
  margin-bottom: var(--space-12);
}

.marathon-photo {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.marathon-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease;
}

.marathon-photo:hover img {
  transform: scale(1.03);
}

.marathon-photo-main {
  min-height: 400px;
}

.marathon-photo-family {
  min-height: 400px;
}

.marathon-photo-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-6) var(--space-5) var(--space-4);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.75));
  color: var(--white);
  font-size: var(--text-sm);
  line-height: var(--leading-snug);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.marathon-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--coral-500);
  color: var(--white);
  font-weight: var(--weight-bold);
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  flex-shrink: 0;
  min-width: 40px;
  text-align: center;
}

/* Stats row */
.marathon-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  text-align: center;
}

.marathon-stat {
  padding: var(--space-6) var(--space-4);
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--gray-100);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.marathon-stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.marathon-stat-number {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-extrabold);
  color: var(--ocean-500);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.marathon-stat-label {
  font-size: var(--text-sm);
  color: var(--gray-500);
  line-height: var(--leading-snug);
}

/* Responsive */
@media (max-width: 1024px) {
  .marathon-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .marathon-gallery {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  .marathon-photo-main,
  .marathon-photo-family {
    min-height: 280px;
  }
  .marathon-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }
}

@media (max-width: 480px) {
  .marathon-stat {
    padding: var(--space-4) var(--space-3);
  }
  .marathon-stat-number {
    font-size: var(--text-2xl);
  }
}