/* ============================================
   MAIN LAYOUT & GLOBAL STYLES
   ============================================ */

/* ── App shell ──────────────────────────────── */
#app {
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg-gradient);
  background-attachment: fixed;
  position: relative;
  display: flex;
  flex-direction: column;
}

/* ── Screens ─────────────────────────────────── */
.screen {
  display: none;
  flex-direction: column;
  flex: 1;
  min-height: 100dvh;
}

.screen.active {
  display: flex;
}

/* ── App screens (z nav) ─────────────────────── */
.app-screen {
  padding-bottom: calc(var(--bottom-nav-height) + var(--safe-area-bottom));
}

/* ── Scrollable content ──────────────────────── */
.screen-content {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0 var(--space-4);
}

/* ── Header ──────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-4) var(--space-3);
  padding-top: calc(var(--space-4) + env(safe-area-inset-top, 0px));
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: var(--header-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
}

.app-header h1 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header-icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

.header-icon-btn:hover,
.header-icon-btn:active {
  background: var(--glass-bg-strong);
  transform: scale(0.95);
}

.header-icon-btn .material-symbols-rounded {
  font-size: 22px;
}

/* ── Section headers ─────────────────────────── */
.section-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
}

/* ── Dividers ────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--glass-border);
  margin: var(--space-4) 0;
}

/* ── Page padding ────────────────────────────── */
.page-pad {
  padding: var(--space-4);
}

/* ── Center content ──────────────────────────── */
.center {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

/* ── Auth screens layout ─────────────────────── */
.auth-screen {
  justify-content: center;
  padding: var(--space-6);
  padding-top: calc(env(safe-area-inset-top, 0px) + var(--space-8));
  position: relative;
}

.auth-logo {
  margin-bottom: var(--space-8);
  text-align: center;
}

.auth-logo .logo-icon {
  width: 80px;
  height: 80px;
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  box-shadow: var(--glass-shadow);
}

.auth-logo .logo-icon .material-symbols-rounded {
  font-size: 40px;
  color: var(--white);
}

.auth-logo h1 {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.auth-logo p {
  color: var(--text-secondary);
  font-size: var(--font-size-md);
  margin-top: var(--space-1);
}

/* ── Banners ─────────────────────────────────── */
.offline-banner {
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: var(--space-2) var(--space-4);
  text-align: center;
  font-size: var(--font-size-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-toast);
  transform: translateY(-100%);
  transition: var(--transition);
}

.offline-banner.visible {
  transform: translateY(0);
}

/* ── Desktop centering ───────────────────────── */
@media (min-width: 768px) {
  #app {
    align-items: center;
    background-attachment: fixed;
  }

  #app-shell {
    width: 100%;
    max-width: 480px;
    position: relative;
    background: var(--bg-gradient);
    min-height: 100dvh;
    box-shadow: 0 0 60px rgba(229, 57, 53, 0.12), 0 0 0 1px rgba(0,0,0,0.06);
  }
}