/* ============================================================
   LAYOUT — Sidebar + Main + Responsive
   ============================================================ */

/* ── App Shell ── */
#app {
  display: flex;
  min-height: 100vh;
}

/* ── PIN Screen ── */
#pin-screen {
  position: fixed; inset: 0;
  background: linear-gradient(135deg, var(--primary-dark) 0%, #1a1035 100%);
  display: flex; align-items: center; justify-content: center;
  z-index: 9999;
  flex-direction: column;
  gap: var(--space-8);
}

.pin-bg-pattern {
  position: absolute; inset: 0; opacity: 0.04;
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,0.3) 1px, transparent 0);
  background-size: 40px 40px;
}

.pin-logo { text-align: center; user-select: none; }
.pin-logo h1 {
  font-family: var(--font-sans);
  font-size: var(--text-4xl);
  font-weight: 800;
  color: var(--white);
  letter-spacing: var(--tracking-tight);
}
.pin-logo p {
  font-size: var(--text-sm);
  color: var(--primary-light);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  margin-top: var(--space-1);
}

.pin-box {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  width: 340px;
  text-align: center;
  backdrop-filter: blur(20px);
}

.pin-box h2 {
  color: var(--white);
  font-size: var(--text-base);
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.pin-box .pin-subtitle {
  color: var(--primary-light);
  font-size: var(--text-xs);
  margin-bottom: var(--space-6);
}

.pin-dots {
  display: flex; gap: var(--space-3);
  justify-content: center;
  margin-bottom: var(--space-6);
}

.pin-dot {
  width: 14px; height: 14px;
  border-radius: var(--radius-full);
  border: 2px solid rgba(255,255,255,0.3);
  background: transparent;
  transition: all var(--duration-fast) var(--ease-out);
}
.pin-dot.filled {
  background: var(--primary-light);
  border-color: var(--primary-light);
  box-shadow: 0 0 12px rgba(162,155,254,0.4);
}

.pin-numpad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
}

.pin-btn {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: var(--text-xl);
  font-weight: 500;
  padding: var(--space-4);
  transition: all var(--duration-fast);
}
.pin-btn:hover { background: rgba(255,255,255,0.12); }
.pin-btn:active { transform: scale(0.95); }
.pin-btn.delete { font-size: var(--text-sm); color: var(--primary-light); }

.pin-error {
  color: var(--error);
  font-size: var(--text-xs);
  margin-top: var(--space-3);
  opacity: 0;
  transition: opacity var(--duration-normal);
}
.pin-error.show { opacity: 1; }

/* ── Sidebar ── */
.sidebar {
  position: fixed; left: 0; top: 0; bottom: 0;
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: var(--sidebar-border);
  padding: var(--space-6) 0;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: width var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-header {
  padding: 0 var(--space-5) var(--space-5);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-brand {
  display: flex; align-items: center; gap: var(--space-3);
}

.sidebar-brand-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--white);
  font-weight: 800;
  font-size: var(--text-lg);
  flex-shrink: 0;
  box-shadow: 0 2px 12px rgba(91,75,199,0.4);
}

.sidebar-brand h1 {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--white);
  letter-spacing: var(--tracking-tight);
  line-height: 1;
}

.sidebar-brand p {
  font-size: var(--text-xs);
  color: var(--primary-light);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.sidebar-collapse-btn {
  width: 28px; height: 28px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.06);
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,0.5);
  font-size: var(--text-sm);
  transition: all var(--duration-fast);
}
.sidebar-collapse-btn:hover {
  background: rgba(255,255,255,0.12);
  color: var(--white);
}

/* Navigation */
.nav-section {
  padding: var(--space-2) var(--space-3);
}

.nav-section-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: rgba(255,255,255,0.35);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-1);
}

.nav-item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  color: rgba(255,255,255,0.55);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--duration-fast);
  margin-bottom: 2px;
  position: relative;
}

.nav-item:hover {
  color: var(--white);
  background: rgba(255,255,255,0.08);
}

.nav-item.active {
  color: var(--white);
  background: rgba(91,75,199,0.35);
  font-weight: 600;
}

.nav-item.active::before {
  content: '';
  position: absolute; left: 0; top: 50%;
  transform: translateY(-50%);
  width: 3px; height: 20px;
  background: var(--primary-light);
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
}

.nav-icon {
  width: 20px; height: 20px;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.nav-badge {
  margin-left: auto;
  background: var(--primary);
  color: var(--white);
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  line-height: 1.4;
}

/* Sidebar bottom */
.sidebar-bottom {
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255,255,255,0.08);
}

.sidebar-status {
  padding: var(--space-3) var(--space-5);
  display: flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
}

.status-dot {
  width: 7px; height: 7px;
  border-radius: var(--radius-full);
  background: var(--error);
  flex-shrink: 0;
}
.status-dot.connected { background: var(--success); }

/* ── Main Content ── */
.main {
  margin-left: var(--sidebar-width);
  padding: var(--space-8);
  min-height: 100vh;
  width: calc(100% - var(--sidebar-width));
  max-width: calc(var(--content-max-width) + var(--space-8) * 2);
  transition: margin-left var(--duration-slow) var(--ease-out);
}

/* Page header */
.page-header {
  margin-bottom: var(--space-8);
  animation: fadeIn var(--duration-slow) var(--ease-out);
}

.page-header h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
}

.page-header p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-top: var(--space-1);
}

/* Views */
.view { display: none; }
.view.active {
  display: block;
  animation: fadeIn var(--duration-normal) var(--ease-out);
}

/* ── Responsive ── */
.mobile-topbar {
  display: none;
  position: fixed; top: 0; left: 0; right: 0;
  height: 56px;
  background: var(--surface);
  border-bottom: var(--border-light);
  z-index: 99;
  padding: 0 var(--space-4);
  align-items: center;
  justify-content: space-between;
}

.mobile-topbar-brand {
  display: flex; align-items: center; gap: var(--space-2);
  font-weight: 700; font-size: var(--text-base);
  color: var(--text-primary);
}

.mobile-menu-btn {
  width: 36px; height: 36px;
  border: none; background: none;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  color: var(--text-primary);
}

.sidebar-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 99;
  backdrop-filter: blur(4px);
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: var(--shadow-xl);
    z-index: 200;
  }
  .sidebar.mobile-open { transform: translateX(0); }
  .sidebar-overlay.show { display: block; }

  .mobile-topbar { display: flex; }

  .main {
    margin-left: 0;
    width: 100%;
    padding: 72px var(--space-4) var(--space-4);
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  :root { --sidebar-width: 220px; }
}