/* =========================================
   Layout — двухуровневый хедер + футер
   nauka.panor.ru | Издательский дом «Панорама»
   ========================================= */

/* Container */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}
.container--narrow { max-width: var(--container-article); margin: 0 auto; padding: 0 var(--container-padding); }
.container--wide   { max-width: var(--container-wide);   margin: 0 auto; padding: 0 var(--container-padding); }

/* =============================================
   HEADER — двухуровневый, как в макете Панорама
   Верхняя полоса: логотип + контакты/поиск/соц
   Нижняя полоса: главное меню (белая)
   ============================================= */
.header,
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
  background: var(--color-bg);
}

/* ---------- TOP BAR ---------- */
.header-top {
  background: var(--header-top-bg);
  color: var(--header-top-color);
}

.header-top__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: var(--space-6);
}

/* Логотип */
.header-top__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.header-top__logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  color: var(--color-primary);
  font-weight: var(--fw-bold);
  font-size: 11px;
  letter-spacing: 0.03em;
  width: 48px;
  height: 36px;
  border-radius: var(--radius-sm);
  padding: 2px 4px;
  line-height: 1.2;
  text-align: center;
}

.header-top__logo-text {
  display: flex;
  flex-direction: column;
}

.header-top__logo-name {
  font-size: var(--fs-base);
  font-weight: var(--fw-bold);
  color: white;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.header-top__logo-sub {
  font-size: var(--fs-xs);
  color: rgba(255,255,255,0.6);
  line-height: 1.2;
}

/* Правая часть топбара */
.header-top__right,
.header-top__contacts {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  flex-shrink: 0;
}

.header-top__contact {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-xs);
  color: rgba(255,255,255,0.75);
}

.header-top__contact a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.header-top__contact a:hover { color: white; }

.header-top__socials {
  display: flex;
  gap: var(--space-2);
}

.header-top__social {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  font-size: 12px;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.header-top__social:hover { background: rgba(255,255,255,0.22); color: white; }

.header-top__search-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-md);
  color: rgba(255,255,255,0.8);
  font-size: var(--fs-xs);
  padding: var(--space-1) var(--space-3);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast);
}

.header-top__search-btn:hover { background: rgba(255,255,255,0.2); color: white; }

.header-top__feedback {
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  cursor: pointer;
  font-family: var(--font-main);
  text-decoration: none;
  transition: background var(--transition-fast);
  white-space: nowrap;
}

.header-top__feedback:hover { background: var(--color-accent-hover); color: white; }

/* ---------- NAV BAR ---------- */
.header-nav {
  background: var(--header-nav-bg);
  border-bottom: 2px solid var(--color-primary);
}

.header-nav__inner {
  display: flex;
  align-items: center;
  height: 48px;
  gap: 0;
}

/* Список меню */
.nav-list {
  display: flex;
  align-items: stretch;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
}

/* «Для авторов» — первый пункт с чертой */
.nav-item {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0 var(--space-4);
  height: 48px;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
  cursor: pointer;
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-bg-light);
}

.nav-link.active,
.nav-link[aria-current="page"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: var(--fw-semibold);
}

/* Dropdown trigger */
.nav-item--dropdown > .nav-link::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  margin-left: var(--space-1);
  opacity: 0.5;
  transition: transform var(--transition-fast);
}

.nav-item--dropdown:hover > .nav-link::after { transform: rotate(180deg); }

/* Dropdown menu */
.nav-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: white;
  border: 1px solid var(--color-border-light);
  border-top: 3px solid var(--color-primary);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  min-width: 220px;
  box-shadow: var(--shadow-lg);
  z-index: calc(var(--z-sticky) + 1);
  padding: var(--space-2) 0;
  animation: slideDown 0.2s ease;
  list-style: none;
  margin: 0;
}

.nav-item--dropdown:hover > .nav-dropdown { display: block; }

/* Пункты второго уровня (li внутри ul.nav-dropdown) */
.nav-dropdown__item {
  list-style: none;
}
.nav-dropdown__item > .nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-5);
  height: auto;
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-bottom: none;
  white-space: normal;
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-dropdown__item > .nav-link:hover { color: var(--color-primary); background: var(--color-bg-light); }

/* Пункты подменю — ссылки внутри li */
.nav-dropdown .nav-link,
.nav-dropdown__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-5);
  height: auto;
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-bottom: none;
  white-space: normal;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-dropdown .nav-link:hover,
.nav-dropdown__link:hover { color: var(--color-primary); background: var(--color-bg-light); }

.nav-dropdown__link--active { color: var(--color-primary); font-weight: var(--fw-medium); }

.nav-dropdown__sep {
  height: 1px;
  background: var(--color-border-light);
  margin: var(--space-2) 0;
}

/* Right side of nav — write btn */
.header-nav__right {
  margin-left: auto;
  display: flex;
  align-items: center;
  padding-right: var(--space-2);
}

.nav-write-btn,
.header-nav__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  background: var(--color-accent);
  color: white;
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-decoration: none;
  transition: background var(--transition-fast);
  white-space: nowrap;
  margin-left: auto;
  flex-shrink: 0;
  border: none;
}

.nav-write-btn:hover,
.header-nav__cta:hover { background: var(--color-accent-hover); color: white; }

/* Burger (mobile) */
.burger,
.burger-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-left: auto;
}

.burger__line,
.burger-btn__line {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition-base);
  display: block;
}

.burger.active .burger__line:nth-child(1),
.burger-btn.active .burger-btn__line:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.burger.active .burger__line:nth-child(2),
.burger-btn.active .burger-btn__line:nth-child(2) { opacity: 0; }
.burger.active .burger__line:nth-child(3),
.burger-btn.active .burger-btn__line:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 104px; /* 56 + 48 */
  left: 0;
  right: 0;
  bottom: 0;
  background: white;
  z-index: calc(var(--z-sticky) - 1);
  padding: var(--space-4) var(--container-padding);
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  border-top: 2px solid var(--color-primary);
}

.mobile-menu.open { display: flex; }

.mobile-menu .nav-link {
  height: auto;
  padding: var(--space-3) var(--space-2);
  font-size: var(--fs-base);
  border-bottom: 1px solid var(--color-border-light);
  border-left: none;
  width: 100%;
}

.mobile-menu .nav-item:last-child > .nav-link { border-bottom: none; }

.mobile-menu .nav-dropdown {
  position: static;
  display: block !important;
  border: none;
  box-shadow: none;
  padding: 0;
  background: var(--color-bg-light);
  border-radius: var(--radius-md);
  margin: var(--space-1) 0 var(--space-2);
  animation: none;
}

.mobile-menu .nav-item--dropdown { flex-direction: column; align-items: flex-start; }
.mobile-menu .nav-item--dropdown > .nav-link::after { display: none; }

/* =============================================
   FOOTER
   ============================================= */
.footer,
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-12) 0 var(--space-6);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2.5fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  margin-bottom: var(--space-4);
}

.footer__logo-mark {
  background: rgba(255,255,255,0.15);
  color: white;
  font-weight: var(--fw-bold);
  font-size: 11px;
  width: 44px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.footer__logo-text { color: white; font-weight: var(--fw-bold); font-size: var(--fs-base); }
.footer__logo-subtext { color: rgba(255,255,255,0.5); font-size: var(--fs-xs); }

.footer__desc {
  font-size: var(--fs-sm);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-5);
  color: rgba(255,255,255,0.6);
}

.footer__contacts .footer__contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  margin-bottom: var(--space-2);
  color: rgba(255,255,255,0.65);
}

.footer__contacts .footer__contact-item a,
.footer__contacts .footer__contact-link {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.footer__contacts .footer__contact-item a:hover,
.footer__contacts .footer__contact-link:hover { color: white; }

.footer__col-title {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: rgba(255,255,255,0.4);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
}

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

.footer__link {
  color: rgba(255,255,255,0.6);
  font-size: var(--fs-sm);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__link:hover { color: white; }

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.footer__copyright { font-size: var(--fs-xs); color: rgba(255,255,255,0.35); }

.footer__legal-nav { margin-top: var(--space-2); }
.footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer__legal-links li a {
  font-size: var(--fs-xs);
  color: rgba(255,255,255,0.35);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.footer__legal-links li a:hover { color: rgba(255,255,255,0.7); }

.footer__founded { margin-left: var(--space-2); }

.footer__socials { display: flex; gap: var(--space-3); }

.footer__social {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.55);
  font-size: 13px;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.footer__social:hover { background: rgba(255,255,255,0.16); color: white; }

/* =============================================
   TOAST
   ============================================= */
.toast-container {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--color-primary);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  pointer-events: all;
  animation: slideDown 0.3s ease;
  max-width: 360px;
}

.toast--success { border-color: var(--color-success); }
.toast--error   { border-color: var(--color-error); }
.toast--warning { border-color: var(--color-warning); }

/* =============================================
   MODAL
   ============================================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

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

.modal {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal { transform: scale(1); }

/* =============================================
   READ PROGRESS
   ============================================= */
.read-progress {
  position: fixed;
  top: 104px;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  z-index: calc(var(--z-sticky) + 1);
  transition: width 0.1s linear;
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1100px) {
  .header-top__contact { display: none; }
  .nav-link { padding: 0 var(--space-3); }
}

@media (max-width: 900px) {
  .header-nav .nav-list,
  .header-nav__cta { display: none; }
  .burger,
  .burger-btn { display: flex; }
  .header-top__right .header-top__socials { display: none; }
  .mobile-menu { top: 56px; }
  .read-progress { top: 56px; }
}

@media (max-width: 768px) {
  .footer__grid { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
  .footer__bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  :root { --container-padding: 1rem; }
  .footer__grid { grid-template-columns: 1fr; }
  body { cursor: auto; }
  .cursor, .cursor-follower { display: none; }
}