*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Скрытый от визуала, видимый для скринридеров */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Ссылка «Перейти к основному содержимому» — видна при фокусе */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0.75rem;
  z-index: 10001;
  padding: 0.5rem 1rem;
  background: var(--color-accent);
  color: var(--color-bg);
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0.75rem;
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

:root {
  --color-bg: #0f1419;
  --color-surface: #1a2230;
  --color-border: #2d3a4f;
  --color-text: #e6edf3;
  --color-text-muted: #9ca3af;
  --color-accent: #58a6ff;
  --color-accent-hover: #79b8ff;
  --font-sans: system-ui, -apple-system, sans-serif;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Блокировка прокрутки при открытом мобильном меню */
body.nav-open {
  overflow: hidden;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
}

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

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

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

.nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-link {
  color: var(--color-text-muted);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--color-accent);
}

.nav-link--active {
  color: var(--color-text);
  font-weight: 600;
  position: relative;
}

.nav-link--active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.auth-links {
  display: flex;
  gap: 0.5rem;
}

.auth-links a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.auth-links a:hover {
  color: var(--color-accent);
}

.auth-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

#user-info[hidden],
.auth-user[hidden],
#login-link[hidden] {
  display: none !important;
}

.user-email {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.user-email-link {
  text-decoration: none;
  color: inherit;
}
.user-email-link:hover .user-email {
  color: var(--color-accent);
}

.btn {
  padding: 0.4rem 0.8rem;
  font-size: 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s, transform 0.15s, box-shadow 0.2s;
}

.btn:hover:not(:disabled) {
  background: var(--color-surface);
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(88, 166, 255, 0.15);
}

.btn:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-outline:hover {
  background: rgba(88, 166, 255, 0.15);
}

.footer-link {
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer-link:hover {
  color: var(--color-accent);
}

.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem;
  flex: 1;
}

.footer {
  margin-top: auto;
  padding: 1rem 1.5rem;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.footer p {
  margin: 0;
}

.footer-links {
  margin: 0.35rem 0 0;
  font-size: 0.85rem;
}

.scroll-top-btn {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: rgba(26, 34, 48, 0.9);
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 50;
}

.scroll-top-btn--visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Кнопка переключения языка (единый вид на всех страницах) */
.lang-dropdown {
  position: relative;
  display: inline-block;
}

.lang-current {
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  min-width: 2.5rem;
  text-align: center;
  transition: background 0.2s, border-color 0.2s, color 0.2s, transform 0.15s, box-shadow 0.2s;
}

.lang-current:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(88, 166, 255, 0.15);
}

.lang-current:active {
  transform: translateY(0);
  box-shadow: none;
}

.lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 100;
  min-width: 140px;
  padding: 0.35rem 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.15s, visibility 0.15s, transform 0.15s;
}

.lang-dropdown--open .lang-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.5rem 0.85rem;
  border: none;
  background: none;
  color: var(--color-text);
  font-size: 0.9rem;
  cursor: pointer;
  text-align: left;
  transition: background 0.2s, color 0.2s, padding-left 0.2s;
}

.lang-option:hover {
  background: rgba(88, 166, 255, 0.1);
  color: var(--color-accent);
  padding-left: 1.1rem;
}

.lang-option--active {
  color: var(--color-accent);
  font-weight: 600;
}

.lang-option--active::after {
  content: '✓';
  margin-left: auto;
  font-size: 0.85rem;
}

.lang-option-flag {
  font-weight: 700;
  font-size: 0.8rem;
  min-width: 1.5rem;
}

/* Hamburger toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}
.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: #e2e8f0;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle--active .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle--active .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle--active .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 20, 25, 0.97);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    z-index: 1000;
  }
  .nav--open { display: flex; }
  .nav .nav-link { font-size: 1.25rem; }
  .header .auth-links,
  .header .lang-dropdown { display: none; }
  .nav--open .auth-links,
  .nav--open .lang-dropdown { display: flex; }
}

@media (max-width: 640px) {
  .header {
    padding: 0.5rem 1rem;
  }

  .main {
    padding: 1rem;
  }

  .footer {
    padding: 0.75rem 1rem;
    font-size: 0.85rem;
  }
}

.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  font-size: 0.95rem;
  color: #fff;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
  opacity: 1;
  transition: opacity 0.3s ease;
  max-width: 360px;
}
.toast--error {
  background: #e53935;
}
.toast--success {
  background: #43a047;
}
.toast--hide {
  opacity: 0;
}