/* ============================================================
   ГЛОБАЛЬНЫЙ CSS ПЛАТФОРМЫ (СОВРЕМЕННЫЙ, СТИЛЬ НЕДЕЛЬ НАУКИ)
   ============================================================ */
:root {
  --app-bg: #F8FAFC;
  --app-bg-rgb: 248, 250, 252;
  --app-card: #FFFFFF;
  --app-card-hover: #F3F4F6;
  --app-border: #E2E8F0;
  --app-text: #0F172A;
  --app-text-muted: #4B5563;
  --app-text-light: #6B7280;
  --app-primary: #055397;
  --app-primary-dark: #044070;
  --app-primary-light: #E8F0F7;
  --app-primary-lighter: #F0F5FA;
  --app-accent: #5BA3D0;
  --app-deadline: #B57F00;
  --app-deadline-bg: #FFF9E6;
  --app-radius: 8px;
  --app-shadow: 0 1px 3px rgba(0,0,0,0.08);
  --app-transition: all 0.2s ease;
  --platform-max-width: 1400px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --app-bg: #0B1120;
    --app-bg-rgb: 11, 17, 32;
    --app-card: #1E293B;
    --app-card-hover: #334155;
    --app-border: #334155;
    --app-text: #F8FAFC;
    --app-text-muted: #94A3B8;
    --app-primary: #5BA3D0;
    --app-primary-dark: #4A8FB8;
    --app-primary-light: #1E3A4D;
  }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Mulish', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--app-text);
  background: var(--app-bg);
  line-height: 1.5;
  margin: 0;
  transition: background 0.3s, color 0.3s;
  font-weight: 500;
  overflow-x: hidden;
}
a { color: var(--app-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- ПЛАТФОРМЕННЫЙ ХЕДЕР (ОБНОВЛЁН) ---------- */
.platform-header {
  position: sticky;
  top: 0;
  z-index: 1002;
  background: rgba(var(--app-bg-rgb), 0.85);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
  border-bottom: 1px solid var(--app-border);
}
.platform-header-inner {
  max-width: var(--platform-max-width);
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.platform-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.platform-logo-badge {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--app-primary) 0%, var(--app-accent) 100%);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: white; font-weight: 800; font-size: 18px;
  box-shadow: 0 4px 8px rgba(5,83,151,0.2);
}
.platform-logo-text {
  height: 36px;
  background: linear-gradient(135deg, var(--app-primary) 0%, var(--app-accent) 100%);
  border-radius: 10px;
  padding: 0 16px;
  display: flex; align-items: center;
  color: white; font-weight: 700; font-size: 14px;
  letter-spacing: 1px;
  box-shadow: 0 4px 8px rgba(5,83,151,0.2);
}
.platform-nav { display: flex; gap: 8px; }
.platform-nav-btn {
  padding: 8px 18px;
  background: transparent;
  color: var(--app-text-muted);
  border-radius: 40px;
  font-size: 13px; font-weight: 600;
  text-decoration: none;
  transition: var(--app-transition);
  border: 1px solid transparent;
}
.platform-nav-btn:hover {
  background: var(--app-primary);
  color: white;
  border-color: var(--app-primary-dark);
}
.platform-actions { display: flex; gap: 6px; }
.platform-action-btn {
  width: 40px; height: 40px;
  border-radius: 40px;
  border: 1px solid var(--app-border);
  background: transparent;
  color: var(--app-text);
  font-size: 18px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: var(--app-transition);
}
.platform-action-btn:hover {
  background: var(--app-primary-light);
  border-color: var(--app-primary);
  color: var(--app-primary);
}
.platform-action-btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* ---------- ПЛАТФОРМЕННЫЙ ФУТЕР (ОБНОВЛЁН) ---------- */
.platform-footer {
  background: var(--app-card);
  border-top: 2px solid var(--app-primary);
  padding: 40px 24px 20px;
  margin-top: 60px;
}
.platform-footer-inner {
  max-width: var(--platform-max-width);
  margin: 0 auto;
}
.platform-footer-flag { margin-bottom: 20px; }
.platform-footer-flag-stripes {
  display: flex;
  height: 6px;
  border-radius: 3px;
  overflow: hidden;
}
.platform-footer-flag-stripe.white { background: #FFFFFF; flex: 1; }
.platform-footer-flag-stripe.blue { background: #0039A6; flex: 1; }
.platform-footer-flag-stripe.red { background: #D52B1E; flex: 1; }
.platform-footer-content { padding: 20px 0; }
.platform-footer-block {
  padding: 20px 0;
  border-bottom: 1px solid var(--app-border);
}
.platform-footer-block:last-child { border-bottom: none; }
.platform-footer-brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.platform-footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.platform-footer-logo-badge {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--app-primary) 0%, var(--app-accent) 100%);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: white; font-weight: 800; font-size: 18px;
}
.platform-footer-logo-text {
  height: 36px;
  background: linear-gradient(135deg, var(--app-primary) 0%, var(--app-accent) 100%);
  border-radius: 10px;
  padding: 0 16px;
  display: flex; align-items: center;
  color: white; font-weight: 700; font-size: 14px;
  letter-spacing: 1px;
}
.platform-footer-logo-text-group {
  display: flex;
  flex-direction: column;
  margin-left: 8px;
}
.platform-footer-logo-main { font-size: 13px; font-weight: 600; color: var(--app-text); }
.platform-footer-logo-sub { font-size: 11px; color: var(--app-primary); }
.platform-footer-support-grid {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.platform-footer-support-group {
  display: flex;
  align-items: center;
  gap: 12px;
}
.platform-footer-support-label {
  font-size: 11px; font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--app-primary);
  background: var(--app-primary-light);
  padding: 6px 12px;
  border-radius: 40px;
}
.platform-footer-support-orgs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.platform-footer-support-org-btn {
  padding: 8px 16px;
  background: var(--app-card);
  border: 1px solid var(--app-border);
  border-radius: 40px;
  font-size: 12px; font-weight: 500;
  color: var(--app-text-muted);
  text-decoration: none;
  transition: var(--app-transition);
}
.platform-footer-support-org-btn:hover {
  background: var(--app-primary-light);
  border-color: var(--app-primary);
  color: var(--app-primary);
}
.platform-footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.platform-footer-section { }
.platform-footer-section-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  cursor: pointer;
}
.platform-footer-section-icon { font-size: 20px; }
.platform-footer-section h3 {
  font-size: 14px; font-weight: 700;
  color: var(--app-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.platform-footer-section-header::after {
  content: "▼";
  font-size: 12px;
  color: var(--app-text-muted);
  margin-left: auto;
  transition: transform 0.2s;
}
.platform-footer-section.collapsed .platform-footer-section-header::after {
  transform: rotate(-90deg);
}
.platform-footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.platform-footer-section.collapsed .platform-footer-list {
  display: none;
}
.platform-footer-item {
  font-size: 13px;
  color: var(--app-text-muted);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 1px dashed transparent;
  transition: var(--app-transition);
}
.platform-footer-item:hover {
  color: var(--app-primary);
  border-bottom-color: var(--app-primary-light);
}
.platform-footer-item.inactive {
  color: var(--app-text-light);
  cursor: default;
}
.platform-footer-contacts-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.platform-footer-cmn-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}
.platform-footer-cmn-logo-badges {
  display: flex;
  align-items: center;
  gap: 10px;
}
.platform-footer-cmn-logo-mn {
  width: 40px; height: 40px;
  background: #2F4D99;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: white; font-weight: 800; font-size: 16px;
}
.platform-footer-cmn-logo-text {
  display: flex;
  flex-direction: column;
}
.platform-footer-cmn-logo-main {
  font-size: 13px; font-weight: 600;
  color: #2F4D99;
}
.platform-footer-cmn-logo-sub {
  font-size: 11px;
  color: var(--app-text-muted);
}
.platform-footer-cmn-operator-badge {
  font-size: 11px; font-weight: 600;
  color: #2F4D99;
  background: rgba(47,77,153,0.1);
  padding: 6px 12px;
  border-radius: 40px;
}
.platform-footer-contacts {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.platform-footer-contact-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--app-primary-light);
  border: 1px solid var(--app-border);
  border-radius: 40px;
  font-size: 12px; font-weight: 600;
  color: var(--app-primary);
  text-decoration: none;
  cursor: pointer;
  transition: var(--app-transition);
}
.platform-footer-contact-btn:hover {
  background: var(--app-primary);
  color: white;
  border-color: var(--app-primary);
}
.platform-footer-contact-icon {
  width: 20px; height: 20px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 6px;
  font-size: 14px;
}
.platform-footer-contact-icon.email { background: var(--app-primary); color: white; }
.platform-footer-contact-icon.vk { background: #0077FF; color: white; }
.platform-footer-contact-icon.tg { background: #229ED9; color: white; }
.platform-footer-contact-icon.max { background: #8F47D3; color: white; }
.platform-footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--app-border);
  font-size: 12px;
  color: var(--app-text-muted);
}
.platform-footer-copyright #year { color: var(--app-primary); font-weight: 700; }
.platform-footer-copyright #niit-accent { color: var(--app-accent); font-weight: 700; }
.platform-footer-developer a { color: var(--app-text-muted); }
.platform-footer-developer a:hover { color: var(--app-primary); }

/* ---------- ПЛАВАЮЩАЯ НАВИГАЦИЯ (МОБИЛЬНАЯ) ---------- */
.platform-floating-nav {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--app-card);
  border: 1px solid var(--app-border);
  border-radius: 60px;
  padding: 8px 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  z-index: 9998;
  display: none;
  gap: 4px;
  backdrop-filter: blur(8px);
}
.platform-floating-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 12px;
  border-radius: 40px;
  background: transparent;
  border: none;
  text-decoration: none;
  color: var(--app-text-muted);
  transition: var(--app-transition);
  min-width: 60px;
}
.platform-floating-nav-btn:hover,
.platform-floating-nav-btn.active {
  background: var(--app-primary-light);
  color: var(--app-primary);
}
.platform-floating-nav-icon { font-size: 20px; }
.platform-floating-nav-label { font-size: 10px; font-weight: 600; }

/* ---------- АДАПТИВ ---------- */
@media (max-width: 768px) {
  .platform-header-inner { padding: 8px 16px; }
  .platform-nav { display: none; }
  .platform-floating-nav { display: flex; }
  .platform-footer-brand-row { flex-direction: column; align-items: flex-start; }
  .platform-footer-support-grid { flex-direction: column; gap: 16px; }
  .platform-footer-links { grid-template-columns: 1fr; }
  .platform-footer-section-header { margin-bottom: 8px; }
  .platform-footer-contacts-row { flex-direction: column; align-items: stretch; }
  .platform-footer-cmn-brand { flex-wrap: wrap; }
  .platform-footer-contacts { justify-content: center; }
  .platform-footer-bottom { flex-direction: column; text-align: center; }
}