/* ── Layout System ─────────────────────────────────────────────── */
@import './variables.css';

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background: var(--bg-primary);
  max-width: var(--max-content-width);
  margin: 0 auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

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

/* ── Header ───────────────────────────────────────────────────── */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--space-lg);
  background: var(--bg-secondary);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.app-header__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--accent-green);
  letter-spacing: -0.02em;
}

.app-header__cal-bar {
  flex: 1;
  margin: 0 var(--space-lg);
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.app-header__cal-fill {
  height: 100%;
  background: var(--accent-green);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

/* ── Main Content Area ────────────────────────────────────────── */
.app-main {
  flex: 1;
  padding: var(--space-lg);
  padding-bottom: calc(var(--tab-bar-height) + var(--space-lg));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* ── Page Sections ────────────────────────────────────────────── */
.page-section {
  margin-bottom: var(--space-xl);
}

.section-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

/* ── Two-Column Grid (Quick Actions) ──────────────────────────── */
.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

/* ── Bottom Tab Bar ───────────────────────────────────────────── */
.tab-bar {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--max-content-width);
  height: var(--tab-bar-height);
  display: flex;
  align-items: center;
  justify-content: space-around;
  background: var(--bg-secondary);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 0 var(--space-sm);
  z-index: 100;
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.tab-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: var(--space-xs) var(--space-md);
  min-width: 64px;
  min-height: 48px;
  color: var(--text-muted);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.tab-btn svg {
  width: 22px;
  height: 22px;
  transition: color var(--transition-fast);
}

.tab-btn.active {
  color: var(--accent-green);
}

.tab-btn:active {
  background: var(--bg-tertiary);
}

/* ── Modal Overlay ────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  animation: fadeIn var(--transition-fast) ease;
}

.modal-sheet {
  width: 100%;
  max-width: var(--max-content-width);
  max-height: 85vh;
  background: var(--bg-secondary);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  padding: var(--space-xl) var(--space-lg);
  padding-bottom: calc(var(--space-xl) + env(safe-area-inset-bottom, 0));
  overflow-y: auto;
  animation: slideUp var(--transition-base) ease;
}

.modal-sheet__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
}

.modal-sheet__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
}

.modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
}

/* ── Animations ───────────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.5; }
}

/* ── Loading State ────────────────────────────────────────────── */
.skeleton {
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-card) 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── Empty State ──────────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) var(--space-lg);
  color: var(--text-muted);
  text-align: center;
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-lg);
  opacity: 0.3;
}

.empty-state__text {
  font-size: var(--font-size-md);
}