/* SPLITWISE — LAYOUT (Dual-Theme) */

/* ----- App Shell ----- */
#app { position:relative; z-index:1; min-height:100vh; min-height:100dvh; display:flex; flex-direction:column; }

/* ----- Top Nav ----- */
.top-nav {
  display:flex; align-items:center; justify-content:space-between;
  padding:var(--space-md) var(--space-xl);
  background: var(--nav-bg);
  backdrop-filter:blur(20px); -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border-subtle);
  position:sticky; top:0; z-index:var(--z-dropdown);
  transition: background 0.3s ease, border-color 0.3s ease;
}

[data-theme="light"] .top-nav {
  box-shadow: var(--shadow-sm);
}

.nav-brand { display:flex; align-items:center; gap:var(--space-sm); cursor:pointer; -webkit-tap-highlight-color:transparent; }
.nav-logo { font-size:1.5rem; }
.nav-title {
  font-size:var(--font-lg); font-weight:800;
  background:linear-gradient(135deg, var(--accent), var(--purple));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
  background-clip:text; letter-spacing:-0.02em;
}
.nav-actions { display:flex; gap:var(--space-sm); align-items:center; }

.nav-links { display:none; align-items:center; gap:var(--space-lg); position:absolute; left:50%; transform:translateX(-50%); }
.nav-tab { background:none; border:none; padding:var(--space-sm) var(--space-md); color:var(--text-secondary); cursor:pointer; font-weight:600; font-size:var(--font-sm); font-family:var(--font-family); transition:color var(--duration-fast); }
.nav-tab:hover { color:var(--text-primary); }
.nav-tab.active { color:var(--accent); }
/* ----- Bottom Tab Bar ----- */
.bottom-tabs {
  display:none; position:fixed; bottom:0; left:0; right:0; z-index:var(--z-dropdown);
  background: var(--nav-bg);
  backdrop-filter:blur(20px); -webkit-backdrop-filter:blur(20px);
  border-top:1px solid var(--border-subtle);
  padding:var(--space-xs) 0 calc(var(--space-xs) + env(safe-area-inset-bottom));
  transition: background 0.3s ease, border-color 0.3s ease;
}

[data-theme="light"] .bottom-tabs {
  box-shadow: 0 -2px 12px rgba(0,0,0,0.06);
}

.bottom-tabs-inner { display:flex; justify-content:space-around; }
.bottom-tab {
  display:flex; flex-direction:column; align-items:center; gap:2px;
  padding:var(--space-sm) var(--space-md);
  background:none; border:none; color:var(--text-tertiary); cursor:pointer; font-family:var(--font-family);
  font-size:11px; font-weight:500; transition:color var(--duration-fast);
  -webkit-tap-highlight-color:transparent;
  min-width:64px;
}
.bottom-tab-icon { font-size:1.3rem; }
.bottom-tab.active { color:var(--accent); }
.bottom-tab:not(.active):active { color:var(--text-secondary); }

/* ----- Main Content ----- */
.main-content {
  flex:1; max-width:720px; width:100%; margin:0 auto;
  padding:var(--space-xl) var(--space-lg) var(--space-3xl);
}

/* ----- Page Header ----- */
.page-header { margin-bottom:var(--space-xl); animation:fadeInUp var(--duration-slow) var(--ease-out); }
.page-title { font-size:var(--font-2xl); font-weight:700; letter-spacing:-0.02em; margin-bottom:var(--space-xs); }
.page-subtitle { color:var(--text-secondary); font-size:var(--font-sm); }

/* ----- Section ----- */
.section { margin-bottom:var(--space-xl); }
.section-header { display:flex; align-items:center; justify-content:space-between; margin-bottom:var(--space-md); gap:var(--space-sm); }
.section-title { font-size:var(--font-lg); font-weight:700; }

/* ----- Grid Layouts ----- */
.groups-grid { display:grid; grid-template-columns:repeat(auto-fill, minmax(260px,1fr)); gap:var(--space-md); }

.summary-cards { display:grid; grid-template-columns:repeat(4, 1fr); gap:var(--space-sm); margin-bottom:var(--space-xl); }

.summary-card {
  text-align:center; padding:var(--space-md) var(--space-sm);
}

[data-theme="light"] .summary-card {
  background: var(--bg-secondary);
  box-shadow: var(--shadow-card);
}

.summary-value { font-size:var(--font-xl); font-weight:700; margin-bottom:2px; }
.summary-label { font-size:var(--font-xs); color:var(--text-secondary); text-transform:uppercase; letter-spacing:0.06em; }

/* ----- Group Card Layout ----- */
.group-card { animation:fadeInUp var(--duration-slow) var(--ease-out); animation-fill-mode:both; }

[data-theme="light"] .group-card {
  background: var(--bg-secondary);
  box-shadow: var(--shadow-card);
}

.group-card-header { display:flex; align-items:center; justify-content:space-between; margin-bottom:var(--space-md); }
.group-card-icon { font-size:1.8rem; }
.group-card-name { font-size:var(--font-base); font-weight:700; margin-bottom:3px; }
.group-card-members { font-size:var(--font-xs); color:var(--text-secondary); }
.group-card-footer {
  display:flex; align-items:center; justify-content:space-between;
  margin-top:var(--space-md); padding-top:var(--space-md);
  border-top:1px solid var(--border-subtle);
}
.group-card-balance { font-size:var(--font-sm); font-weight:600; }

/* ----- Group Detail Layout ----- */
.group-detail-header { display:flex; align-items:flex-start; gap:var(--space-lg); margin-bottom:var(--space-xl); flex-wrap:wrap; }
.group-detail-info { flex:1; min-width:200px; }
.group-detail-actions { display:flex; gap:var(--space-sm); flex-wrap:wrap; }
.members-list { display:flex; flex-wrap:wrap; gap:var(--space-sm); margin-top:var(--space-md); }
.member-chip {
  display:flex; align-items:center; gap:var(--space-sm); padding:4px 12px 4px 4px;
  background:var(--bg-surface); border:1px solid var(--border-subtle); border-radius:var(--radius-full);
  font-size:var(--font-sm);
  transition: background 0.2s ease;
}

[data-theme="light"] .member-chip {
  background: var(--bg-secondary);
  box-shadow: var(--shadow-sm);
}

.member-chip-remove {
  width:20px; height:20px; border-radius:50%; background:rgba(248,113,113,0.12);
  border:none; color:var(--red); cursor:pointer; font-size:12px; display:flex;
  align-items:center; justify-content:center; margin-left:4px; opacity:0; transition:opacity var(--duration-fast);
}
.member-chip:hover .member-chip-remove { opacity:1; }

/* Mobile: always show remove button (no hover on touch) */
@media (pointer: coarse) {
  .member-chip-remove { opacity:0.7; }
}

/* ----- Reminder Section ----- */
.reminder-section {
  display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap;
  gap:var(--space-md); padding:var(--space-md); border-radius:var(--radius-md);
  background: var(--purple-glow);
  border:1px solid rgba(167,139,250,0.15);
  transition: background 0.3s ease;
}

[data-theme="light"] .reminder-section {
  background: rgba(139,92,246,0.06);
  border-color: rgba(139,92,246,0.12);
}

.reminder-info { display:flex; align-items:center; gap:var(--space-sm); }
.reminder-icon { font-size:1.3rem; }
.reminder-label { font-size:var(--font-sm); font-weight:500; }
.reminder-date { font-size:var(--font-xs); color:var(--text-secondary); }
.reminder-controls { display:flex; align-items:center; gap:var(--space-md); }
.reminder-day-input {
  width:60px; padding:6px 8px; background:var(--input-bg); border:1px solid var(--border-default);
  border-radius:var(--radius-sm); color:var(--text-primary); font-family:var(--font-family);
  font-size:var(--font-sm); text-align:center;
}
.reminder-day-input:focus { outline:none; border-color:var(--purple); }

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

/* ----- Person Detail Layout ----- */
.person-detail-header .avatar-lg {
  width: 56px;
  height: 56px;
  font-size: 1.4rem;
}

/* =============================================
   RESPONSIVE BREAKPOINTS
   ============================================= */

/* --- Tablet & below (768px) --- */
@media (max-width:768px) {
  .top-nav { padding:var(--space-sm) var(--space-md); }
  .main-content { padding:var(--space-md) var(--space-md) calc(80px + env(safe-area-inset-bottom)); }
  .bottom-tabs { display:block; }
  .nav-actions .btn span.btn-text { display:none; }
  .groups-grid { grid-template-columns:1fr; }
  .summary-cards { grid-template-columns:repeat(2, 1fr); gap:var(--space-sm); }
  .summary-value { font-size:var(--font-lg); }
  .group-detail-header { flex-direction:column; }
  .page-title { font-size:var(--font-xl); }

  .person-detail-header {
    flex-direction: row;
    align-items: center;
    gap: var(--space-md);
  }

  .paid-by-selector {
    grid-template-columns: 1fr 1fr;
  }

  .person-balance-display {
    font-size: var(--font-2xl);
  }

  /* Modal: full-width on phones */
  .modal {
    margin: var(--space-sm);
    padding: var(--space-lg);
    max-height: 92vh;
    max-height: 92dvh;
    border-radius: var(--radius-lg);
  }

  .modal-backdrop {
    padding: var(--space-sm);
    align-items: flex-end;
  }
}

/* --- Small phones (480px) --- */
@media (max-width:480px) {
  .main-content { padding:var(--space-sm) var(--space-sm) calc(80px + env(safe-area-inset-bottom)); }
  .summary-cards { grid-template-columns:repeat(2, 1fr); }
  .summary-card { padding:var(--space-sm) var(--space-xs); }
  .summary-value { font-size:var(--font-base); }
  .summary-label { font-size:10px; }
  .page-title { font-size:var(--font-lg); }
  .page-subtitle { font-size:var(--font-xs); }
  .section-title { font-size:var(--font-base); }

  .dash-tabs {
    margin-bottom: var(--space-md);
  }

  .person-detail-header .avatar-lg {
    width: 48px;
    height: 48px;
    font-size: 1.2rem;
  }

  /* Modals slide up from bottom on small phones */
  .modal-backdrop {
    align-items: flex-end;
    padding: 0;
  }
  .modal {
    margin: 0;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    max-height: 95vh;
    max-height: 95dvh;
    animation: slideUp var(--duration-normal) var(--ease-out);
  }
}

/* --- Large screens (1024px+) --- */
@media (min-width:1024px) {
  .main-content { max-width:800px; padding:var(--space-2xl) var(--space-xl) var(--space-3xl); }
  .summary-cards { grid-template-columns:repeat(4, 1fr); }
}

@media (min-width:769px) {
  .nav-links { display:flex; }
}