/* === Базовая структура === */

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* === Header === */

.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-base);
  height: var(--header-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
}

.app-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--space-10);
  height: 100%;
}

/* === Main === */

.app-main {
  flex: 1;
  padding: var(--space-10) var(--space-10);
  overflow-x: hidden;
}

/* === Footer === */

.app-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: var(--tracking-wide);
}

.app-footer__badge {
  color: var(--color-accent-dim);
}

/* === Setup grid === */

.setup-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  max-width: var(--content-max-width);
  margin: 0 auto;
}

/* === Transfer container === */

.transfer-container {
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
}

/* === View transitions === */

.view {
  animation: fadeIn 0.3s ease;
}

.view[hidden] {
  display: none;
}

/* === Logo === */

.logo {
  display: flex;
  align-items: center;
}

.logo svg {
  height: 28px;
  width: auto;
}

/* === Адаптивные breakpoints === */

/* Desktop (>= 1025px) — базовые стили выше */

/* Desktop-sm (769–1024px) */
@media (max-width: 1024px) {
  .app-header__inner {
    padding: 0 var(--space-8);
  }

  .app-main {
    padding: var(--space-8) var(--space-8);
  }
}

/* Tablet (481–768px) */
@media (max-width: 768px) {
  .app-header {
    height: var(--header-height-mobile);
  }

  .app-header__inner {
    padding: 0 var(--space-6);
  }

  .app-main {
    padding: var(--space-6) var(--space-6);
    min-height: calc(100dvh - var(--header-height-mobile) - 60px);
  }

  .setup-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
  }
}

/* Mobile (<= 480px) */
@media (max-width: 480px) {
  .app-header__inner {
    padding: 0 var(--space-4);
  }

  .app-main {
    padding: var(--space-4) var(--space-4);
  }

  .setup-grid {
    max-width: 100%;
  }

  .logo svg {
    height: 22px;
  }
}

/* === Touch-оптимизация === */
@media (hover: none) and (pointer: coarse) {
  .btn,
  .transfer-tab,
  .drop-zone {
    min-height: 44px;
  }
}

/* === Safe Area для iOS (notch / Dynamic Island) === */
@supports (padding-top: env(safe-area-inset-top)) {
  .app-header {
    padding-top: env(safe-area-inset-top);
  }
  .app-header__inner {
    padding-left: max(var(--space-10), env(safe-area-inset-left));
    padding-right: max(var(--space-10), env(safe-area-inset-right));
  }
  .toast-container {
    bottom: calc(var(--space-6) + env(safe-area-inset-bottom));
  }
  .app-footer {
    padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom));
  }
  .app-main {
    padding-left: max(var(--space-10), env(safe-area-inset-left));
    padding-right: max(var(--space-10), env(safe-area-inset-right));
  }
}