/* ── Header ──────────────────────────────────────────────────────────────── */

.app-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: var(--header-h);
  padding: 0 var(--space-6);
  background: color-mix(in srgb, var(--color-surface) 80%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

/* ── Main split ──────────────────────────────────────────────────────────── */

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  gap: var(--space-3);
  padding: var(--space-3);
}

@media (min-width: 880px) {
  .app-main {
    flex-direction: row;
    overflow: hidden;
    height: calc(100vh - var(--header-h));
    height: calc(100dvh - var(--header-h));
    padding: var(--space-6);
    gap: var(--space-6);
  }
}

/* ── Panels ──────────────────────────────────────────────────────────────── */

.panel {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.panel--library {
  background: var(--color-surface-2);
}

.panel--preview {
  position: relative;
}

/* ── Panel body: mobile accordion ───────────────────────────────────────── */

@media (max-width: 879px) {
  .panel__body {
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.35s ease;
  }

  .panel:not(.panel--collapsed) .panel__body {
    max-height: 75vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-4);
    min-height: 0;
  }
}

/* ── Desktop: all panels side by side ───────────────────────────────────── */

@media (min-width: 880px) {
  .panel--library {
    flex: 0 0 340px;
    border-right: 1px solid var(--color-border);
    overflow: hidden;
  }

  .panel--library .panel__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    overflow-y: auto;
  }

  .panel--editor {
    flex: 1;
    max-width: 580px;
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
  }

  .panel--editor .panel__body {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    padding: var(--space-6);
    flex: 1;
    min-height: 0;
  }

  .panel--preview {
    flex: 1;
    overflow-y: auto;
  }

  .panel--preview .panel__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
  }
}

/* ── Editor internals ────────────────────────────────────────────────────── */

.metadata-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

@media (max-width: 520px) {
  .metadata-form { grid-template-columns: 1fr; }
}

.editor-area {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  flex: 1;
  min-height: 0;
}

@media (max-width: 879px) {
  .editor-area {
    flex: 1;
  }
}

.editor-area__input {
  flex: 1;
  min-height: 240px;
}

@media (max-width: 879px) {
  .editor-area__input {
    min-height: 150px;
  }
}

.transpose-bar {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-tint);
  border: 1px solid var(--color-border-soft);
  border-radius: 999px;
  align-self: flex-start;
}

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

/* ── Preview internals ───────────────────────────────────────────────────── */

.preview-font-bar {
  display: flex;
  gap: var(--space-2);
  flex-shrink: 0;
}

.preview {
  padding: var(--space-8) var(--space-8) var(--space-10);
  max-width: 820px;
}

/* ── Toasts ──────────────────────────────────────────────────────────────── */

.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: 1000;
  pointer-events: none;
}