/* PFOS Layouts — Page Structure & Navigation */

/* ═══════════════════════════════════════════
   App Shell
   ═══════════════════════════════════════════ */
.app {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  background: var(--color-bg-primary);
}

/* ═══════════════════════════════════════════
   Top Header
   ═══════════════════════════════════════════ */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--nav-height);
  border-bottom: 1px solid var(--glass-border);
}

.header-title {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
}

.header-subtitle {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  font-weight: var(--fw-medium);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.header-back {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
  transition: background var(--duration-fast) var(--ease-out);
}
.header-back:hover { background: var(--color-bg-tertiary); }

/* ═══════════════════════════════════════════
   Main Content Area
   ═══════════════════════════════════════════ */
.main {
  flex: 1;
  padding: var(--space-lg);
  padding-bottom: calc(var(--bottom-nav-height) + var(--space-xl));
  overflow-y: auto;
}
.main > *:not(:last-child) { margin-bottom: var(--space-lg); }

/* Page Title */
.page-title {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}
.page-subtitle {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}

/* Section */
.section { margin-bottom: var(--space-xl); }
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
}
.section-action {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-accent-primary);
  cursor: pointer;
}
.section-action:hover { opacity: 0.8; }

/* ═══════════════════════════════════════════
   Bottom Navigation
   ═══════════════════════════════════════════ */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--max-width);
  height: var(--bottom-nav-height);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-top: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 var(--space-xs);
  padding-bottom: env(safe-area-inset-bottom);
  z-index: var(--z-sticky);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  transition: all var(--duration-fast) var(--ease-out);
  position: relative;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.nav-item:hover { color: var(--color-text-secondary); }
.nav-item.active {
  color: var(--color-accent-primary);
  font-weight: var(--fw-semibold);
}
.nav-item.active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 2px;
  background: var(--color-accent-primary);
  border-radius: 0 0 var(--radius-full) var(--radius-full);
}

.nav-icon {
  font-size: 20px;
  line-height: 1;
  transition: transform var(--duration-fast) var(--ease-spring);
}
.nav-item.active .nav-icon { transform: scale(1.1); }

.nav-add {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-primary-dark));
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: 0 2px 12px rgba(124, 156, 191, 0.35);
  margin-top: -20px;
  transition: all var(--duration-fast) var(--ease-spring);
}
.nav-add:hover { transform: scale(1.1); box-shadow: 0 4px 16px rgba(124, 156, 191, 0.45); }
.nav-add:active { transform: scale(0.95); }

/* ═══════════════════════════════════════════
   Login / Auth Layout
   ═══════════════════════════════════════════ */
.auth-layout {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-tertiary) 100%);
}

.auth-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}
.auth-logo-icon {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
  box-shadow: 0 8px 32px rgba(124, 156, 191, 0.3);
}
.auth-logo-text {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  font-weight: var(--fw-extrabold);
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.auth-logo-tagline {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  text-align: center;
}

.auth-form {
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* ═══════════════════════════════════════════
   Tabs
   ═══════════════════════════════════════════ */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
}
.tab {
  flex: 1;
  padding: var(--space-md);
  text-align: center;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
  cursor: pointer;
}
.tab:hover { color: var(--color-text-secondary); }
.tab.active { color: var(--color-accent-primary); font-weight: var(--fw-semibold); }
.tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent-primary);
  border-radius: var(--radius-full) var(--radius-full) 0 0;
}

/* ═══════════════════════════════════════════
   Grid Layouts
   ═══════════════════════════════════════════ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

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

.goals-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.accounts-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* ═══════════════════════════════════════════
   Responsive (Wider screens)
   ═══════════════════════════════════════════ */
@media (min-width: 768px) {
  :root {
    --max-width: 520px;
  }
}

@media (min-width: 1024px) {
  :root {
    --max-width: 480px;
  }
  .app {
    box-shadow: var(--shadow-xl);
    border-left: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
    min-height: 100vh;
  }
  body {
    background: var(--color-bg-tertiary);
  }
}