/* ===== Design tokens ===== */
:root {
  --bg-primary: #08080d;
  --bg-secondary: #0f0f16;
  --bg-elevated: #16161f;
  --bg-card: #12121a;
  --text-primary: #f2efe8;
  --text-secondary: #9c978c;
  --text-muted: #6b665e;
  --accent: #c9a962;
  --accent-light: #e8c97a;
  --accent-glow: rgba(201, 169, 98, 0.25);
  --border: rgba(201, 169, 98, 0.15);
  --border-strong: rgba(201, 169, 98, 0.35);
  --header-height: 72px;
  --container: 1200px;
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-display: "Georgia", "Times New Roman", serif;
}

/* ===== Reset ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body.menu-open,
body.lightbox-open {
  overflow: hidden;
}

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

a {
  color: var(--accent-light);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--text-primary);
}

ul {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

.container {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
}

.section {
  padding: 6rem 0;
  position: relative;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.section-intro {
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 3rem;
  font-size: 1.05rem;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: background var(--transition), box-shadow var(--transition), backdrop-filter var(--transition);
}

.header-scrolled {
  background: rgba(8, 8, 13, 0.92);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.partner-logos {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.partner-logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}

.partner-logo:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.partner-logo img,
.partner-logo svg {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.main-nav a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  position: relative;
}

.main-nav a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}

.main-nav a:hover {
  color: var(--text-primary);
}

.main-nav a:hover::after {
  width: 100%;
}

.btn-contacts {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 1.25rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--accent-light);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.btn-contacts:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-primary);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-top,
.hero-bottom {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  width: 100%;
  padding-inline: 1.5rem;
}

.hero-top {
  padding-top: calc(var(--header-height) + 1.5rem);
  padding-bottom: 1rem;
}

.hero-bottom {
  padding-top: 1rem;
  padding-bottom: 3rem;
}

.hero-bg {
  position: relative;
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
  z-index: 0;
  aspect-ratio: 1920 / 829;
  background: var(--bg-primary);
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 2s ease-in-out;
}

.hero-slide.active {
  opacity: 1;
}

.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  filter: brightness(1.22) contrast(1.1) saturate(1.15);
}

.hero-badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  font-weight: 400;
  letter-spacing: 0.08em;
  line-height: 1.15;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--accent-light);
  font-weight: 300;
  letter-spacing: 0.04em;
  margin-bottom: 1.5rem;
}

.hero-text {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: 2.5rem;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  background: linear-gradient(135deg, var(--accent) 0%, #a8893f 100%);
  color: var(--bg-primary);
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
  color: var(--bg-primary);
}

.hero-scroll {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2.5rem;
  color: var(--text-muted);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  animation: scrollBounce 2s ease-in-out infinite;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

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

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}

.stat-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
}

.stat-number {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  color: var(--accent-light);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.4;
}

.about-text {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.8;
  max-width: 900px;
}

.about-text p + p {
  margin-top: 1.25rem;
}

.curators-section {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.curators-heading {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2rem;
  letter-spacing: 0.02em;
}

.curators-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.curator-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.curator-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.curator-photo {
  width: 50%;
  margin: 0 auto;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: var(--bg-secondary);
}

.curator-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  transition: transform var(--transition);
}

.curator-card:hover .curator-photo img {
  transform: scale(1.04);
}

.curator-body {
  padding: 1.5rem 1.75rem 1.75rem;
}

.curator-name {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.curator-role {
  color: var(--accent-light);
  font-size: 0.9rem;
  line-height: 1.4;
  margin-bottom: 1rem;
}

.curator-credentials {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
}

.curator-credentials li {
  position: relative;
  padding-left: 1rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
}

.curator-credentials li.curator-role-line {
  color: var(--accent-light);
  font-size: 0.9rem;
  line-height: 1.4;
}

.curator-credentials li + li {
  margin-top: 0.45rem;
}

.curator-credentials li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
}

.curator-bio {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.65;
  margin: 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

/* ===== Gallery ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.gallery-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.gallery-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.gallery-card-button {
  width: 100%;
  text-align: left;
}

.gallery-card-image {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--bg-elevated);
}

.gallery-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.gallery-card:hover .gallery-card-image img {
  transform: scale(1.06);
}

.gallery-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(8, 8, 13, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}

.gallery-card:hover .gallery-card-overlay {
  opacity: 1;
}

.gallery-card-zoom {
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent-light);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.gallery-card-body {
  padding: 1.25rem 1.5rem 1.5rem;
}

.gallery-card-body h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text-primary);
}

.card-age,
.card-school {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.card-age {
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.card-participants {
  margin: 0.35rem 0;
}

.card-participants li {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
  padding-left: 0.75rem;
  position: relative;
}

.card-participants li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.load-more-wrap {
  text-align: center;
  margin-top: 3rem;
}

.btn-load-more {
  display: inline-flex;
  align-items: center;
  padding: 0.85rem 2.5rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--accent-light);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.btn-load-more[hidden],
.load-more-wrap[hidden] {
  display: none;
}

.btn-load-more:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-primary);
}

/* ===== Lightbox ===== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(4, 4, 8, 0.96);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.lightbox[hidden] {
  display: none;
}

.lightbox-inner {
  position: relative;
  max-width: 1200px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-image {
  max-width: 100%;
  max-height: calc(90vh - 120px);
  object-fit: contain;
  border-radius: var(--radius);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
}

.lightbox-caption {
  margin-top: 1.25rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 700px;
  line-height: 1.6;
}

.lightbox-caption strong {
  display: block;
  color: var(--text-primary);
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
}

.lightbox-caption ul {
  margin: 0.5rem 0;
}

.lightbox-caption li {
  font-size: 0.85rem;
}

.caption-school {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 0.35rem;
}

.lightbox-close,
.lightbox-nav {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: rgba(15, 15, 22, 0.8);
  color: var(--text-primary);
  font-size: 1.25rem;
  transition: border-color var(--transition), background var(--transition);
}

.lightbox-close:hover,
.lightbox-nav:hover {
  border-color: var(--accent);
  background: rgba(201, 169, 98, 0.15);
}

.lightbox-close {
  top: -0.5rem;
  right: 0;
}

.lightbox-prev {
  left: -3.5rem;
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-next {
  right: -3.5rem;
  top: 50%;
  transform: translateY(-50%);
}

/* ===== Training ===== */
.training {
  background: var(--bg-secondary);
}

.training-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.training-logo {
  width: 160px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.85;
  transition: opacity var(--transition);
}

.training-logo:hover {
  opacity: 1;
}

.training-logo img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.training-logo-tp {
  width: auto;
  height: 64px;
  border-radius: 8px;
  overflow: hidden;
}

.training-logo-tp img {
  height: 100%;
  width: auto;
}

.training-text {
  color: var(--text-secondary);
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3rem;
  font-size: 1.05rem;
  line-height: 1.75;
}

.lectures-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.lecture-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  transition: border-color var(--transition);
}

.lecture-card:hover {
  border-color: var(--border-strong);
}

.lecture-date {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--accent-light);
  margin-bottom: 0.75rem;
}

.lecture-title {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.5;
  font-weight: 500;
}

.training-note {
  text-align: center;
  margin-top: 2.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-style: italic;
}

/* ===== Timeline ===== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent), var(--border), transparent);
}

.timeline-item {
  position: relative;
  padding-left: 64px;
  padding-bottom: 2.5rem;
}

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

.timeline-dot {
  position: absolute;
  left: 16px;
  top: 4px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--bg-primary);
  box-shadow: 0 0 12px var(--accent-glow);
}

.timeline-date {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.35rem;
}

.timeline-text {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.55;
}

/* ===== Winners ===== */
.winners {
  background: var(--bg-secondary);
}

.winners-placeholder {
  text-align: center;
  padding: 4rem 2rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  max-width: 600px;
  margin: 0 auto;
}

.winners-placeholder-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  opacity: 0.4;
}

.winners-placeholder h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.winners-placeholder p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 4rem 0 2rem;
}

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

.footer-contacts h3,
.footer-partners h3 {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.footer-email {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--text-primary);
}

.footer-email a {
  color: inherit;
}

.footer-email a:hover {
  color: var(--accent-light);
}

.footer-partners ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-partners a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-partners a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.85rem;
}

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

  .lectures-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin-inline: auto;
  }

  .lightbox-prev { left: 0.5rem; }
  .lightbox-next { right: 0.5rem; }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .partner-logos {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    background: rgba(8, 8, 13, 0.98);
    backdrop-filter: blur(16px);
    transform: translateX(100%);
    transition: transform var(--transition);
  }

  .main-nav.nav-open {
    transform: translateX(0);
  }

  .main-nav a {
    font-size: 1.1rem;
  }

  .btn-contacts {
    display: none;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .curators-grid {
    grid-template-columns: 1fr;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

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

  .section {
    padding: 4rem 0;
  }

  .hero-title {
    letter-spacing: 0.04em;
  }
}

@media (max-width: 480px) {
  .container {
    width: min(100% - 1.5rem, var(--container));
  }

  .hero-bg {
    width: min(100% - 1.5rem, var(--container));
  }

  .lightbox {
    padding: 1rem;
  }

  .lightbox-close {
    top: 0.5rem;
    right: 0.5rem;
  }
}