/* ─── Reset & Variables ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #f5f6fa;
  --surface:      #ffffff;
  --surface-2:    #f9fafb;
  --primary:      #6366f1;
  --primary-hover:#4f52d9;
  --primary-light:#eef2ff;
  --success:      #10b981;
  --success-light:#d1fae5;
  --danger:       #ef4444;
  --danger-light: #fee2e2;
  --warning:      #f59e0b;
  --warning-light:#fef3c7;
  --text:         #111827;
  --text-muted:   #6b7280;
  --text-light:   #9ca3af;
  --border:       #e5e7eb;
  --border-focus: #6366f1;
  --shadow-sm:    0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow:       0 4px 16px rgba(0,0,0,.08);
  --shadow-lg:    0 8px 40px rgba(0,0,0,.12);
  --toast-bg:     #1f2430;
  --radius-sm:    6px;
  --radius:       12px;
  --radius-lg:    16px;
  --sidebar-w:    230px;
  --transition:   all .18s ease;
}

/* ─── Dark theme ─────────────────────────────────────────────── */
:root[data-theme="dark"] {
  --bg:           #101218;
  --surface:      #1a1d25;
  --surface-2:    #21252f;
  --primary:      #818cf8;
  --primary-hover:#a5b0fa;
  --primary-light:#2b2e57;
  --success:      #34d399;
  --success-light:#123328;
  --danger:       #f87171;
  --danger-light: #3f1d1d;
  --warning:      #fbbf24;
  --warning-light:#40320f;
  --text:         #f1f2f6;
  --text-muted:   #9aa1b1;
  --text-light:   #6b7280;
  --border:       #2c3140;
  --border-focus: #818cf8;
  --shadow-sm:    0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);
  --shadow:       0 4px 16px rgba(0,0,0,.5);
  --shadow-lg:    0 8px 40px rgba(0,0,0,.6);
}

html { font-size: 15px; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ─── Utilities ─────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ─── Auth ──────────────────────────────────────────────────── */
.auth-view {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
  padding: 1rem;
}

.auth-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
}

.auth-logo {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: .5rem;
}

.logo-icon { font-size: 1.6rem; }
.logo-text  { font-size: 1.5rem; font-weight: 700; letter-spacing: -.5px; }

.auth-tagline {
  color: var(--text-muted);
  font-size: .875rem;
  margin-bottom: 1.75rem;
}

.tab-row {
  display: flex;
  gap: 0;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 3px;
  margin-bottom: 1.5rem;
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  padding: .5rem;
  border-radius: calc(var(--radius-sm) - 2px);
  cursor: pointer;
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
}

.tab-btn.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

/* ─── Forms ─────────────────────────────────────────────────── */
.auth-form { display: flex; flex-direction: column; gap: 1rem; }

.field { display: flex; flex-direction: column; gap: .375rem; }
.field label { font-size: .8rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .4px; }

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"] {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .625rem .875rem;
  font-size: .9375rem;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  transition: var(--transition);
  outline: none;
  width: 100%;
}

input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}

input::placeholder { color: var(--text-light); }

.select-input {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .625rem .875rem;
  font-size: .9375rem;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
  outline: none;
  transition: var(--transition);
  width: 100%;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .75rem center;
  padding-right: 2.25rem;
}

.select-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}

.field-row { display: flex; flex-direction: column; gap: .75rem; }
.field-row .field { flex: 1; }

.field-group { display: flex; flex-direction: column; gap: 1rem; margin-top: 1.25rem; }

.input-prefix {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
}

.input-prefix:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}

.input-prefix span {
  padding: .625rem .75rem;
  background: var(--surface-2);
  border-right: 1.5px solid var(--border);
  color: var(--text-muted);
  font-size: .875rem;
  font-weight: 500;
  white-space: nowrap;
}

.input-prefix input {
  border: none;
  box-shadow: none;
  border-radius: 0;
  flex: 1;
}

.input-prefix input:focus { box-shadow: none; }

/* ─── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  border: none;
  border-radius: var(--radius-sm);
  padding: .625rem 1.125rem;
  font-size: .9rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary    { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(99,102,241,.3); }

.btn-success    { background: var(--success); color: #fff; }
.btn-success:hover { background: #0ea572; transform: translateY(-1px); }

.btn-danger     { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; }

.btn-ghost      { background: transparent; color: var(--text-muted); border: 1.5px solid var(--border); }
.btn-ghost:hover { background: var(--surface-2); color: var(--text); }

.btn-full  { width: 100%; margin-top: .25rem; }
.btn-sm    { padding: .375rem .75rem; font-size: .8125rem; }
.btn-icon  { padding: .5rem .75rem; gap: .3rem; }

.btn svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

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

/* ─── Sidebar ────────────────────────────────────────────────── */
.sidebar {
  display: none;
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  overflow-y: auto;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: 1.5rem 1.25rem 1rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: .5rem;
}

.sidebar-logo .logo-text { font-size: 1.125rem; font-weight: 700; }

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: .5rem .75rem;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .625rem .75rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  background: none;
  font-family: inherit;
  text-decoration: none;
  width: 100%;
  text-align: left;
}

.nav-item svg {
  width: 18px; height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

.nav-item:hover { background: var(--surface-2); color: var(--text); }

.nav-item.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.sidebar-bottom {
  padding: .75rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logout-btn { color: var(--text-muted); }
.logout-btn:hover { color: var(--danger); background: var(--danger-light); }

/* ─── Main Content ───────────────────────────────────────────── */
.main-content {
  flex: 1;
  padding: 1.25rem 1rem 5.5rem;
  min-height: 100vh;
  width: 100%;
  max-width: 100%;
}

.view { animation: fadeIn .2s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ─── Page Header ────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  gap: .75rem;
  flex-wrap: wrap;
}

.page-header h1 {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -.3px;
}

@media (min-width: 680px) {
  .page-header { margin-bottom: 1.75rem; }
  .page-header h1 { font-size: 1.625rem; }
}

.page-sub { color: var(--text-muted); font-size: .875rem; margin-top: .15rem; }

/* ─── Cards ──────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.card-header h2 { font-size: 1rem; font-weight: 600; }

.section-title {
  font-size: 1rem;
  font-weight: 600;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

.page-actions {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
}

/* ─── Balance Cards ──────────────────────────────────────────── */
.balance-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: .75rem;
  margin-bottom: 1.25rem;
}

.balance-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  position: relative;
  overflow: hidden;
}

.balance-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: var(--radius) var(--radius) 0 0;
}

.balance-card.net::before    { background: var(--primary); }
.balance-card.owed::before   { background: var(--success); }
.balance-card.owing::before  { background: var(--danger); }

.balance-card-label {
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--text-muted);
  margin-bottom: .5rem;
}

.balance-card-amount {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -.5px;
}

.balance-card.net    .balance-card-amount { color: var(--primary); }
.balance-card.owed   .balance-card-amount { color: var(--success); }
.balance-card.owing  .balance-card-amount { color: var(--danger); }

.balance-card-sub { font-size: .8rem; color: var(--text-muted); margin-top: .25rem; }

/* ─── Two Column Layout ──────────────────────────────────────── */
.two-col { display: grid; grid-template-columns: 1fr; gap: 1rem; }

/* ─── Balance List ───────────────────────────────────────────── */
.balance-list { list-style: none; display: flex; flex-direction: column; gap: .5rem; }

.balance-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .625rem 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
  border-radius: var(--radius-sm);
}

.balance-item:last-child { border-bottom: none; }
.balance-item:hover { background: var(--surface-2); padding-inline: .5rem; margin-inline: -.5rem; }

.balance-item-info { flex: 1; min-width: 0; }
.balance-item-name { font-weight: 500; font-size: .9rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.balance-item-sub  { font-size: .775rem; color: var(--text-muted); }

.balance-item-amount { font-weight: 600; font-size: .9375rem; flex-shrink: 0; }
.amount-owe   { color: var(--danger); }
.amount-owed  { color: var(--success); }
.amount-zero  { color: var(--text-muted); }

.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-muted);
  font-size: .875rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .25rem;
}

.empty-state svg {
  width: 40px; height: 40px;
  stroke: var(--border);
  fill: none;
  stroke-width: 1.5;
  margin-bottom: .75rem;
}

/* ─── Activity List ──────────────────────────────────────────── */
.activity-list { list-style: none; display: flex; flex-direction: column; }
.activity-list.full { gap: 0; }

.activity-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .875rem 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.activity-list.full .activity-item { padding: 1rem 1.25rem; border-radius: var(--radius-sm); }
.activity-list.full .activity-item:hover { background: var(--surface); }

.activity-item:last-child { border-bottom: none; }

.activity-icon {
  width: 36px; height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.activity-icon.expense { background: var(--primary-light); }
.activity-icon.settle  { background: var(--success-light); }

.activity-info { flex: 1; min-width: 0; }
.activity-title { font-weight: 500; font-size: .9rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.activity-sub   { font-size: .775rem; color: var(--text-muted); margin-top: .1rem; }

.activity-right { text-align: right; flex-shrink: 0; }
.activity-amount { font-weight: 600; font-size: .9rem; }
.activity-share  { font-size: .75rem; color: var(--text-muted); margin-top: .1rem; }

/* ─── Friends Grid ───────────────────────────────────────────── */
.friends-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: .875rem;
}
@media (min-width: 540px) {
  .friends-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
}

.friend-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: var(--transition);
  cursor: pointer;
}

.friend-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }

.friend-card-top { display: flex; align-items: center; gap: .875rem; }
.friend-card-info { flex: 1; min-width: 0; }
.friend-name   { font-weight: 600; font-size: .9375rem; }
.friend-handle { font-size: .8rem; color: var(--text-muted); }

.friend-balance {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: .875rem;
}

.friend-balance.owed  { background: var(--success-light); }
.friend-balance.owing { background: var(--danger-light); }
.friend-balance.zero  { background: var(--surface-2); }

.friend-balance-label { color: var(--text-muted); }
.friend-balance-amount { font-weight: 700; }
.friend-balance.owed  .friend-balance-amount { color: var(--success); }
.friend-balance.owing .friend-balance-amount { color: var(--danger); }

.friend-actions { display: flex; gap: .5rem; }
.friend-actions .btn { flex: 1; justify-content: center; }

/* ─── Groups Grid ────────────────────────────────────────────── */
.groups-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: .875rem;
}
@media (min-width: 560px) {
  .groups-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
}

.group-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

.group-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }

.group-card-header { display: flex; align-items: flex-start; gap: .875rem; }
.group-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.group-card-info { flex: 1; }
.group-card-name { font-weight: 700; font-size: 1rem; }
.group-card-desc { font-size: .8rem; color: var(--text-muted); margin-top: .15rem; }

.group-meta {
  display: flex;
  gap: .75rem;
  font-size: .8rem;
  color: var(--text-muted);
}

.group-meta span { display: flex; align-items: center; gap: .3rem; }

.group-balance {
  padding: .625rem .875rem;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
}

.group-balance.positive { background: var(--success-light); color: var(--success); }
.group-balance.negative { background: var(--danger-light); color: var(--danger); }
.group-balance.zero     { background: var(--surface-2); color: var(--text-muted); }

/* ─── Group Detail ───────────────────────────────────────────── */
.group-detail-header {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-bottom: 1.25rem;
}

.group-detail-title { font-size: 1.5rem; font-weight: 700; margin-bottom: .25rem; }
.group-detail-desc  { color: var(--text-muted); font-size: .875rem; margin-bottom: 1.25rem; }

.member-chips { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.25rem; }

.member-chip {
  display: flex;
  align-items: center;
  gap: .5rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .3rem .75rem .3rem .35rem;
  font-size: .8125rem;
  font-weight: 500;
}

.group-stats { display: flex; gap: 1.5rem; }
.group-stat  { display: flex; flex-direction: column; gap: .2rem; }
.group-stat-value { font-size: 1.25rem; font-weight: 700; }
.group-stat-label { font-size: .75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .4px; }

.group-content { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.group-content-full { grid-template-columns: 1fr; }

.simplify-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .75rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .875rem;
}

.simplify-item:last-child { border-bottom: none; }
.simplify-arrow { color: var(--text-light); font-size: 1.1rem; }
.simplify-amount { font-weight: 700; color: var(--primary); margin-left: auto; }

/* ─── Expense List ───────────────────────────────────────────── */
.expense-list { display: flex; flex-direction: column; gap: .75rem; }

.expense-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  transition: var(--transition);
}

.expense-item:hover { box-shadow: var(--shadow); border-color: var(--primary); }

.expense-cat-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.expense-info { flex: 1; min-width: 0; }
.expense-desc { font-weight: 600; font-size: .9375rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.expense-meta { display: flex; gap: .75rem; margin-top: .2rem; }
.expense-meta-item { font-size: .775rem; color: var(--text-muted); }

.expense-right { text-align: right; flex-shrink: 0; }
.expense-total  { font-weight: 700; font-size: 1rem; }
.expense-share  { font-size: .8rem; margin-top: .15rem; font-weight: 500; }
.expense-share.you-lent { color: var(--success); }
.expense-share.you-owe  { color: var(--danger); }
.expense-share.settled  { color: var(--text-muted); }

/* ─── Filter Row ─────────────────────────────────────────────── */
.filter-row {
  display: flex;
  flex-direction: column;
  gap: .625rem;
  margin-bottom: 1.25rem;
}
@media (min-width: 540px) {
  .filter-row { flex-direction: row; align-items: center; flex-wrap: wrap; }
}

/* ─── Filter Bar (expenses page) ─────────────────────────────── */
.filter-bar {
  display: flex;
  flex-direction: column;
  gap: .625rem;
  margin-bottom: 1.25rem;
}

.filter-bar .select-input { width: 100%; }

.date-range {
  display: flex;
  align-items: center;
  gap: .5rem;
}

.date-range-sep { color: var(--text-light); flex-shrink: 0; }

.date-input {
  flex: 1;
  min-width: 0;
  color: var(--text-muted);
}

.date-input:valid { color: var(--text); }

@media (min-width: 680px) {
  .filter-bar { flex-direction: row; align-items: center; flex-wrap: wrap; }
  .filter-bar .search-bar.inline { flex: 2 1 220px; }
  .filter-bar .filter-select { flex: 1 1 150px; width: auto; }
  .filter-bar .date-range { flex: 1 1 260px; }
}

.search-bar {
  display: flex;
  align-items: center;
  gap: .5rem;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .5rem .875rem;
  transition: var(--transition);
}

.search-bar.inline { flex: 1; min-width: 180px; }
.search-bar:focus-within { border-color: var(--border-focus); box-shadow: 0 0 0 3px rgba(99,102,241,.12); }

.search-bar svg {
  width: 16px; height: 16px;
  stroke: var(--text-muted);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

.search-bar input {
  border: none;
  background: transparent;
  font-size: .875rem;
  flex: 1;
  min-width: 0;
  outline: none;
  padding: 0;
}

.search-bar input:focus { box-shadow: none; }

/* ─── Badges ─────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  border-radius: 999px;
  font-size: .7rem;
  font-weight: 700;
  padding: 0 .4rem;
}

.badge-success { background: var(--success-light); color: var(--success); }
.badge-danger  { background: var(--danger-light); color: var(--danger); }
.badge-primary { background: var(--primary-light); color: var(--primary); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .2rem .6rem;
  font-size: .75rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* ─── Avatars ────────────────────────────────────────────────── */
.avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .8125rem;
  font-weight: 700;
  flex-shrink: 0;
  text-transform: uppercase;
}

.avatar-lg { width: 52px; height: 52px; font-size: 1.1rem; }
.avatar-sm { width: 26px; height: 26px; font-size: .7rem; }

.avatar-stack { display: flex; }
.avatar-stack .avatar { border: 2px solid var(--surface); margin-left: -8px; }
.avatar-stack .avatar:first-child { margin-left: 0; }

.avatar-row { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.25rem; }
.user-name   { font-size: 1.125rem; font-weight: 700; }
.user-handle { color: var(--text-muted); font-size: .875rem; }

/* ─── Modals ─────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 1000;
  padding: 0;
  animation: fadeOverlay .18s ease;
}

@keyframes fadeOverlay { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--surface);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  width: 100%;
  max-width: 100%;
  max-height: 92vh;
  overflow-y: auto;
  animation: slideUp .25s ease;
  box-shadow: var(--shadow-lg);
  padding-bottom: env(safe-area-inset-bottom);
}

.modal.modal-sm { max-width: 100%; }

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

@media (min-width: 600px) {
  .modal-overlay { align-items: center; padding: 1rem; }
  .modal { border-radius: var(--radius-lg); max-width: 560px; }
  .modal.modal-sm { max-width: 420px; }
  @keyframes slideUp { from { transform: translateY(16px); opacity: 0; } to { transform: none; opacity: 1; } }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 1.5rem 0;
}

.modal-header h2 { font-size: 1.125rem; font-weight: 700; }

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1rem;
  padding: .25rem .5rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  line-height: 1;
}

.modal-close:hover { background: var(--surface-2); color: var(--text); }

.modal-body {
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-footer {
  display: flex;
  flex-direction: column-reverse;
  gap: .625rem;
  padding: 1rem 1.25rem 1.25rem;
  border-top: 1px solid var(--border);
}
.modal-footer .btn { width: 100%; justify-content: center; }
@media (min-width: 480px) {
  .modal-footer { flex-direction: row; justify-content: flex-end; padding: 1rem 1.5rem 1.5rem; }
  .modal-footer .btn { width: auto; }
}

/* ─── Split Type Buttons ─────────────────────────────────────── */
.split-type-row {
  display: flex;
  gap: .5rem;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 3px;
}

.split-btn {
  flex: 1;
  background: none;
  border: none;
  padding: .45rem .75rem;
  border-radius: calc(var(--radius-sm) - 2px);
  cursor: pointer;
  font-size: .825rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
  font-family: inherit;
}

.split-btn.active {
  background: var(--surface);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
}

/* ─── Chip Area ──────────────────────────────────────────────── */
.chip-area {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  min-height: 36px;
  padding: .375rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: .5rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 999px;
  padding: .2rem .6rem .2rem .4rem;
  font-size: .8rem;
  font-weight: 600;
}

.chip-remove {
  cursor: pointer;
  opacity: .6;
  font-size: .9rem;
  line-height: 1;
  padding: 0 .1rem;
  transition: var(--transition);
  border: none;
  background: none;
  color: inherit;
}

.chip-remove:hover { opacity: 1; }

.participant-adder {
  display: flex;
  gap: .5rem;
}

.participant-adder input { flex: 1; }

/* ─── Split Detail ───────────────────────────────────────────── */
.split-detail {
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: .875rem;
  display: flex;
  flex-direction: column;
  gap: .625rem;
  border: 1px solid var(--border);
}

.split-row {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.split-row-name {
  flex: 1;
  font-size: .875rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: .5rem;
}

.split-row input, .split-row .split-auto {
  width: 100px;
  text-align: right;
  font-size: .875rem;
}

.split-auto {
  padding: .5rem .75rem;
  color: var(--text-muted);
  border: 1.5px dashed var(--border);
  border-radius: var(--radius-sm);
  font-size: .875rem;
}

/* ─── Settle ─────────────────────────────────────────────────── */
.settle-info {
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 1rem;
  text-align: center;
  border: 1px solid var(--border);
}

.settle-info .settle-to { font-size: .8rem; color: var(--text-muted); margin-bottom: .25rem; }
.settle-info .settle-name { font-size: 1.125rem; font-weight: 700; margin-bottom: .5rem; }
.settle-info .settle-amount { font-size: 2rem; font-weight: 700; color: var(--danger); }

/* ─── Expense Detail ─────────────────────────────────────────── */
.expense-detail-split {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.split-detail-row {
  display: flex;
  align-items: center;
  gap: .875rem;
  padding: .875rem 1rem;
  border-bottom: 1px solid var(--border);
}

.split-detail-row:last-child { border-bottom: none; }
.split-detail-row:nth-child(even) { background: var(--surface-2); }

.split-detail-info { flex: 1; min-width: 0; }
.split-detail-name { font-weight: 500; font-size: .875rem; }
.split-detail-sub  { font-size: .775rem; color: var(--text-muted); }

.split-detail-amounts { text-align: right; }
.split-detail-owed  { font-weight: 700; font-size: .9rem; }
.split-detail-net   { font-size: .775rem; margin-top: .1rem; font-weight: 600; }
.split-detail-net.lent { color: var(--success); }
.split-detail-net.owe  { color: var(--danger); }

/* ─── User Search Results ────────────────────────────────────── */
.user-results { list-style: none; display: flex; flex-direction: column; gap: 0; }

.user-result-item {
  display: flex;
  align-items: center;
  gap: .875rem;
  padding: .75rem 0;
  border-bottom: 1px solid var(--border);
}

.user-result-item:last-child { border-bottom: none; }
.user-result-info { flex: 1; }
.user-result-name   { font-weight: 500; font-size: .9rem; }
.user-result-handle { font-size: .775rem; color: var(--text-muted); }

/* ─── Account / Stats ────────────────────────────────────────── */
.account-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.25rem;
}

.stat-item {
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 1rem;
  border: 1px solid var(--border);
}

.stat-value { font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.stat-label { font-size: .775rem; color: var(--text-muted); margin-top: .2rem; text-transform: uppercase; letter-spacing: .4px; }

/* ─── Category Chart ─────────────────────────────────────────── */
.cat-chart { display: flex; flex-direction: column; gap: .625rem; margin-top: 1.25rem; }

.cat-bar-row { display: flex; flex-direction: column; gap: .2rem; }

.cat-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: .8rem;
  color: var(--text-muted);
}

.cat-bar-label span:last-child { font-weight: 600; color: var(--text); }

.cat-bar-track {
  height: 6px;
  background: var(--surface-2);
  border-radius: 999px;
  overflow: hidden;
}

.cat-bar-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 999px;
  transition: width .6s ease;
}

/* ─── Toast ──────────────────────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 5rem;
  left: 1rem;
  right: 1rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  pointer-events: none;
}

@media (min-width: 680px) {
  #toast-container {
    bottom: 1.5rem;
    left: auto;
    right: 1.5rem;
    align-items: flex-end;
  }
}

.toast {
  display: flex;
  align-items: center;
  gap: .75rem;
  background: var(--toast-bg);
  color: #fff;
  padding: .75rem 1.125rem;
  border-radius: var(--radius);
  font-size: .875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: toastIn .25s ease;
  width: 100%;
  max-width: 400px;
  pointer-events: auto;
}

.toast.success { background: var(--success); }
.toast.error   { background: var(--danger); }
.toast.warning { background: var(--warning); color: var(--text); }

@keyframes toastIn  { from { transform: translateX(100%); opacity: 0; } to { transform: none; opacity: 1; } }
@keyframes toastOut { from { transform: none; opacity: 1; } to { transform: translateX(110%); opacity: 0; } }

/* ─── Link ───────────────────────────────────────────────────── */
.link {
  color: var(--primary);
  font-size: .8125rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
}
.link:hover { text-decoration: underline; }

/* ─── Bottom Nav (mobile) ────────────────────────────────────── */
.bottom-nav {
  display: flex;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  z-index: 100;
  padding-bottom: env(safe-area-inset-bottom);
}

.bottom-nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .2rem;
  padding: .55rem .25rem;
  color: var(--text-muted);
  font-size: .65rem;
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition);
  border: none;
  background: none;
  font-family: inherit;
  cursor: pointer;
}

.bottom-nav-item svg {
  width: 22px; height: 22px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.bottom-nav-item.active { color: var(--primary); }
.bottom-nav-item:active { transform: scale(.9); }

/* ─── Responsive (mobile-first, min-width) ───────────────────── */
@media (min-width: 480px) {
  .field-row            { flex-direction: row; }
  .balance-cards        { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 680px) {
  .sidebar              { display: flex; }
  .bottom-nav           { display: none; }
  .main-content         { margin-left: var(--sidebar-w); padding: 2rem 2.5rem; max-width: 1100px; }
  .two-col              { grid-template-columns: 1fr 1fr; }
  .account-grid         { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 900px) {
  .group-content        { grid-template-columns: 1fr 340px; }
}

/* ─── HTMX-specific additions ───────────────────────────────── */
.text-success { color: var(--success) !important; }
.text-danger  { color: var(--danger) !important; }
.text-muted   { color: var(--text-muted) !important; }

.balance-card-success::before { background: var(--success); }
.balance-card-danger::before  { background: var(--danger); }

.balance-label { font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; color: var(--text-muted); margin-bottom: .5rem; }
.balance-amount { font-size: 1.875rem; font-weight: 700; letter-spacing: -.5px; }
.balance-card-success .balance-amount { color: var(--success); }
.balance-card-danger  .balance-amount { color: var(--danger); }

.balance-info { flex: 1; min-width: 0; }
.balance-name { font-weight: 500; font-size: .9rem; }

.friend-header { display: flex; align-items: center; gap: .875rem; }

.group-name { font-weight: 700; font-size: 1rem; }
.group-desc { font-size: .8rem; color: var(--text-muted); margin-top: .15rem; }

.expense-row {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: var(--transition);
}
.expense-row:hover { box-shadow: var(--shadow); border-color: var(--primary); }

.expense-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem; flex-shrink: 0;
  margin-top: .1rem;
}

.expense-info { flex: 1; min-width: 0; }

.expense-desc {
  font-weight: 600;
  font-size: 1rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: .35rem;
}

.expense-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
}

.expense-tag {
  display: inline-flex;
  align-items: center;
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .3px;
  padding: .2rem .55rem;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.expense-tag.group-tag {
  background: var(--primary-light);
  color: var(--primary);
  border-color: transparent;
}

.expense-tag.recurring-tag {
  background: var(--warning-light);
  color: #b45309;
  border-color: transparent;
  text-transform: none;
  letter-spacing: 0;
}

.recurring-note {
  margin-top: .35rem;
  font-size: .8rem;
  font-weight: 500;
  color: #b45309;
}

.expense-right {
  flex-shrink: 0;
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: .25rem;
}

.expense-amount {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}

.expense-date {
  font-size: .75rem;
  color: var(--text-muted);
}


.activity-desc { font-weight: 500; font-size: .9rem; }
.activity-meta { font-size: .775rem; color: var(--text-muted); margin-top: .1rem; }
.activity-date { font-size: .775rem; color: var(--text-muted); flex-shrink: 0; margin-left: auto; }

.alert { padding: .75rem 1rem; border-radius: var(--radius-sm); margin-bottom: 1rem; font-size: .875rem; }
.alert-danger { background: var(--danger-light); color: var(--danger); border: 1px solid var(--danger); }

.field-group { display: flex; flex-direction: column; gap: 1rem; margin-top: 1.25rem; }

.chip-selectable { background: var(--surface-2); color: var(--text-muted); cursor: pointer; transition: var(--transition); }
.chip-selectable:has(input:checked) { background: var(--primary-light); color: var(--primary); }

.toast-show { opacity: 1; }
.toast-info    { background: var(--toast-bg); }
.toast-success { background: var(--success); }
.toast-error   { background: var(--danger); }

.htmx-loading { opacity: .5; pointer-events: none; transition: opacity .2s; }

.user-result {
  display: flex; align-items: center; justify-content: space-between;
  gap: .875rem; padding: .75rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .875rem;
}
.user-result:last-child { border-bottom: none; }

a.group-card { text-decoration: none; color: inherit; }

a.nav-item { text-decoration: none; }

/* ─── Theme Switch ───────────────────────────────────────────── */
.theme-switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  margin-top: 1rem;
  font-size: .9rem;
  font-weight: 500;
}

.nav-item .theme-switch { margin-left: auto; }

.theme-switch {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.theme-switch input { display: none; }

.theme-switch-track {
  width: 38px;
  height: 21px;
  background: var(--border);
  border-radius: 999px;
  position: relative;
  transition: var(--transition);
  flex-shrink: 0;
}

.theme-switch-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 17px;
  height: 17px;
  background: var(--surface);
  border-radius: 50%;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.theme-switch input:checked + .theme-switch-track { background: var(--primary); }
.theme-switch input:checked + .theme-switch-track .theme-switch-thumb { left: 19px; }