/* ==========================================================================
   Telegram Multi-Account Scheduler — Base layout
   Reusable layout primitives built on tokens. Includes the shared app shell
   (sidebar + header) so every screen inherits the same structure.
   ========================================================================== */

@layer components {
  /* ---------- Page shell ---------- */
  .app {
    display: flex;
    min-height: 100vh;
    background: var(--bg);
  }

  .app-main {
    flex: 1 1 0;
    display: flex;
    flex-direction: column;
    min-width: 0;
  }

  .app-header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--gap-4);
    min-height: var(--nav-height);
    padding: var(--gap-3) var(--gap-8);
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-sub);
  }

  .page {
    padding: var(--gap-6) var(--gap-8) var(--gap-8);
    max-width: var(--max-width-wide);
    width: 100%;
    margin-inline: auto;
  }

  /* ---------- Sidebar (shared shell) ---------- */
  .sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    width: var(--sidebar-width);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-plain);
    border-right: 1px solid var(--border-sub);
  }

  .sidebar__header {
    height: var(--nav-height);
    display: flex;
    align-items: center;
    gap: var(--gap-3);
    padding: 0 var(--gap-5);
    border-bottom: 1px solid var(--border-sub);
  }

  .sidebar__nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--gap-3) var(--gap-2);
    gap: 2px;
    overflow-y: auto;
  }

  .sidebar__section {
    margin: var(--gap-4) var(--gap-3) var(--gap-1);
  }

  .sidebar__link {
    display: flex;
    align-items: center;
    gap: var(--gap-3);
    height: 36px;
    padding: 0 var(--gap-3);
    font-size: var(--type-1-md);
    font-weight: var(--fw-medium);
    color: var(--text-soft);
    border-radius: var(--radius-2);
    text-decoration: none;
    transition: background var(--transition-fast), color var(--transition-fast);
  }

  .sidebar__link:hover { background: var(--bg-hover); color: var(--text-main); }
  .sidebar__link.selected { background: var(--bg-active); color: var(--text-main); }
  .sidebar__icon { width: 18px; height: 18px; color: var(--text-muted); flex-shrink: 0; }
  .sidebar__link.selected .sidebar__icon { color: var(--accent); }

  .sidebar__footer {
    padding: var(--gap-3) var(--gap-2) var(--gap-4);
    border-top: 1px solid var(--border-sub);
  }

  .sidebar__prototype {
    margin: 0 var(--gap-2) var(--gap-3);
    padding: var(--gap-2) var(--gap-3);
    background: var(--bg-sub);
    border-radius: var(--radius-2);
  }

  /* ---------- Typography ---------- */
  .title-1 { font-size: var(--type-1-3xl); font-weight: var(--fw-semibold); line-height: var(--lh-tight); margin: 0; letter-spacing: var(--tracking-tight); }
  .title-2 { font-size: var(--type-1-2xl); font-weight: var(--fw-semibold); line-height: var(--lh-tight); margin: 0; letter-spacing: var(--tracking-tight); }
  .title-3 { font-size: var(--type-1-xl); font-weight: var(--fw-semibold); line-height: var(--lh-tight); margin: 0; }
  .label   { font-size: var(--type-1-xs); font-weight: var(--fw-medium); color: var(--text-soft); letter-spacing: 0.04em; text-transform: uppercase; }
  .caption { font-size: var(--type-1-xs); color: var(--text-muted); }
  .mono    { font-family: var(--font-mono); font-size: 0.92em; }

  /* ---------- Divider ---------- */
  .divider {
    height: 1px;
    background: var(--border-sub);
    margin: var(--gap-4) 0;
  }

  /* ---------- Field group ---------- */
  .field { margin-bottom: var(--gap-4); }
  .field--inline { display: flex; align-items: center; gap: var(--gap-2); flex-wrap: wrap; margin-bottom: 0; }
  .field-label { display: block; font-size: var(--type-1-sm); font-weight: var(--fw-medium); color: var(--text-main); margin-bottom: var(--gap-1); }
  .field-hint  { font-size: var(--type-1-xs); color: var(--text-muted); margin-top: 2px; }
  .field-error { font-size: var(--type-1-xs); color: var(--error); margin-top: 2px; }

  /* ---------- Focus ---------- */
  :where(button, [role="button"], [tabindex="0"], a) {
    outline: none;
  }
  :where(button, [role="button"], [tabindex="0"], a):focus-visible {
    box-shadow: var(--field-shadow);
    border-color: var(--field-focus);
    border-radius: var(--radius-1);
  }

  /* ---------- Text helpers ---------- */
  .muted { color: var(--text-soft); }
  .truncate { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .mono-xs { font-family: var(--font-mono); font-size: var(--type-1-xs); }

  /* ---------- Grid ---------- */
  .grid { display: grid; gap: var(--gap-4); }
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .g-col { grid-column: 1 / -1; }

  /* ---------- Responsive ---------- */
  @media (max-width: 960px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .page { padding: var(--gap-5) var(--gap-5) var(--gap-6); }
    .app-header { padding: var(--gap-3) var(--gap-5); flex-wrap: wrap; }
  }

  @media (max-width: 760px) {
    .sidebar {
      position: fixed;
      inset-inline-start: 0;
      top: 0;
      z-index: 50;
      transform: translateX(-100%);
      transition: transform var(--transition-base);
      box-shadow: var(--shadow-lg);
    }
    .sidebar.open { transform: translateX(0); }

    .sidebar-scrim {
      position: fixed;
      inset: 0;
      z-index: 40;
      background: var(--overlay-bg);
      opacity: 0;
      pointer-events: none;
      transition: opacity var(--transition-base);
    }
    .sidebar-scrim.show { opacity: 1; pointer-events: auto; }

    .app-main { width: 100%; }

    .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
    .page { padding: var(--gap-4) var(--gap-4) var(--gap-6); }
    .app-header { padding: var(--gap-3) var(--gap-4); }
  }
}

@layer utility {
  .menu-btn {
    display: none;
  }
  @media (max-width: 760px) {
    .menu-btn {
      display: inline-flex;
    }
  }
}