/* Layout — header, footer, page structure */

/* ===== HEADER ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
}

.header__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--space-lg);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
}

.header__logo:hover {
  color: var(--color-primary);
}

.header__logo-icon {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
}

.header__logo-accent {
  color: var(--color-primary);
}

.header__nav {
  flex: 1;
}

.header__nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-md);
  align-items: center;
}

.header__nav-list > li > a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.header__nav-list > li > a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Dropdown */
.header__dropdown {
  position: relative;
}

.header__dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.header__dropdown-trigger:hover,
.header__dropdown-trigger[aria-expanded="true"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.header__dropdown-arrow {
  transition: transform var(--transition-fast);
}

.header__dropdown-trigger[aria-expanded="true"] .header__dropdown-arrow {
  transform: rotate(180deg);
}

.header__dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: var(--space-xs);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  list-style: none;
  min-width: 200px;
  display: none;
  overflow: hidden;
  padding: var(--space-xs) 0;
  z-index: 200;
}

.header__dropdown-trigger[aria-expanded="true"] + .header__dropdown-menu {
  display: block;
}

.header__dropdown-menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 400;
  border-bottom: none;
}

.header__dropdown-menu a:hover {
  background: var(--color-bg-secondary);
  color: var(--color-primary);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

/* Theme toggle */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
  transition: background var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--color-bg-tertiary);
}

[data-theme="light"] .theme-toggle__icon--dark { display: none; }
[data-theme="dark"] .theme-toggle__icon--light { display: none; }

/* Language switcher */
.lang-switcher {
  position: relative;
}

.lang-switcher__trigger {
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  font-weight: 600;
  font-size: 0.85rem;
  min-width: 40px;
}

.lang-switcher__trigger:hover {
  background: var(--color-bg-tertiary);
}

.lang-switcher__menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--space-xs);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  list-style: none;
  min-width: 80px;
  display: none;
  overflow: hidden;
}

.lang-switcher__trigger[aria-expanded="true"] + .lang-switcher__menu {
  display: block;
}

.lang-switcher__menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text-secondary);
  font-size: 0.85rem;
}

.lang-switcher__menu a:hover {
  background: var(--color-bg-secondary);
  color: var(--color-primary);
}

.lang-switcher__menu a[aria-current="true"] {
  color: var(--color-primary);
  font-weight: 600;
}

/* Mobile menu toggle */
.header__menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 6px;
}

.header__menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-fast);
}

/* ===== HERO ===== */
.hero {
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-lg);
}

.hero__title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.hero__subtitle {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-md);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== TOOLS SECTION ===== */
.tools-section {
  margin-top: var(--space-2xl);
}

.tools-section__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.tool-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-fast);
}

.tool-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.tool-card__icon {
  font-size: 1.5rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.tool-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.tool-card__desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* ===== FEATURES ===== */
.features {
  margin-top: var(--space-2xl);
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
}

.features__title {
  text-align: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-xl);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
}

.feature-card {
  text-align: center;
  padding: var(--space-lg);
}

.feature-card__icon {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* ===== MAIN ===== */
main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
  width: 100%;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.footer__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-md) var(--space-lg);
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-xl);
}

.footer__logo {
  font-size: 1.25rem;
  font-weight: 700;
}

.footer__brand p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-top: var(--space-sm);
}

.footer__links h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-md);
}

.footer__links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

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

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

.footer__legal {
  grid-column: 1 / -1;
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-tertiary);
  font-size: 0.8rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .header__nav {
    display: none;
  }

  .header__menu-toggle {
    display: flex;
  }

  .header__nav.open {
    display: block;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md);
    box-shadow: var(--shadow-md);
  }

  .header__nav.open .header__nav-list {
    flex-direction: column;
    gap: 0;
  }

  .header__nav.open .header__dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    margin-top: 0;
    padding-left: var(--space-md);
  }

  .hero__title {
    font-size: 1.75rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }

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

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