:root {
  --bg: #f4f6ff;
  --surface: rgba(255, 255, 255, 0.7);
  --surface-border: rgba(255, 255, 255, 0.4);
  --text: #171a2b;
  --muted: #63698b;
  --accent: #6d5cff;
  --accent-2: #2dd4bf;
  --danger: #ef476f;
  --shadow: 0 10px 25px rgba(23, 26, 43, 0.09);
}

body.dark {
  --bg: #0d1020;
  --surface: rgba(26, 31, 52, 0.7);
  --surface-border: rgba(148, 163, 184, 0.2);
  --text: #f4f6ff;
  --muted: #a4accf;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(circle at top right, rgba(109, 92, 255, 0.16), transparent 45%),
    radial-gradient(circle at top left, rgba(45, 212, 191, 0.12), transparent 40%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.container {
  width: min(1100px, 92%);
  margin: 1.25rem auto 5.5rem;
}

.top-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--surface-border);
  background: rgba(10, 10, 20, 0.06);
  backdrop-filter: blur(14px);
}

.brand {
  font-weight: 800;
  letter-spacing: 0.3px;
}

.nav-actions {
  display: flex;
  gap: 0.5rem;
}

.glass {
  background: var(--surface);
  backdrop-filter: blur(16px);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow);
}

.card {
  border-radius: 1rem;
  padding: 1rem;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: clamp(1.35rem, 2.4vw, 2rem);
}

h2 {
  font-size: 1.1rem;
  margin-bottom: 0.8rem;
}

p {
  color: var(--muted);
}

.page-create {
  display: grid;
  gap: 1rem;
  max-width: 720px;
}

.create-hero h1 {
  margin-bottom: 0.3rem;
}

.form-grid {
  display: grid;
  gap: 0.85rem;
}

.form-grid.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field {
  display: grid;
  gap: 0.4rem;
}

.field span {
  font-size: 0.88rem;
  color: var(--muted);
}

.full-col {
  grid-column: 1 / -1;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(255, 255, 255, 0.8);
  color: #1f2937;
  padding: 0.7rem 0.8rem;
  border-radius: 0.7rem;
  outline: none;
}

body.dark input,
body.dark select,
body.dark textarea {
  background: rgba(51, 65, 85, 0.55);
  color: #f8fafc;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(109, 92, 255, 0.18);
}

button {
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, opacity 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
  transform: translateY(-1px);
}

.gradient-btn {
  color: #fff;
  font-weight: 600;
  border-radius: 0.7rem;
  padding: 0.75rem 0.95rem;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 20px rgba(109, 92, 255, 0.26);
}

.ghost-btn {
  border-radius: 0.7rem;
  padding: 0.65rem 0.85rem;
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(148, 163, 184, 0.35);
}

.link-btn {
  display: inline-flex;
  text-decoration: none;
}

.share-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.6rem;
  margin-top: 0.75rem;
}

.dashboard {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.95rem;
}

.trip-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.totals {
  text-align: right;
}

.totals span {
  font-size: 0.82rem;
  color: var(--muted);
}

.totals strong {
  display: block;
  font-size: 1.3rem;
}

.member-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.member-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.62rem 0.35rem 0.35rem;
  border-radius: 999px;
  background: rgba(109, 92, 255, 0.12);
  font-size: 0.86rem;
}

.member-name {
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.member-remove-btn {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid rgba(239, 71, 111, 0.5);
  background: rgba(239, 71, 111, 0.12);
  color: #be123c;
  font-size: 0.75rem;
  line-height: 1;
  display: inline-grid;
  place-items: center;
  padding: 0;
}

body.dark .member-remove-btn {
  color: #fecdd3;
  border-color: rgba(251, 113, 133, 0.55);
  background: rgba(190, 24, 93, 0.28);
}

.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.74rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
}

.expenses-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.search-wrap {
  flex: 1;
  min-width: 240px;
}

.action-row {
  display: flex;
  gap: 0.55rem;
}

.expense-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.85rem;
}

.expense-card {
  border-radius: 0.9rem;
  padding: 0.9rem;
  border: 1px solid var(--surface-border);
  background: var(--surface);
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.55rem;
}

.expense-top {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
}

.amount {
  font-weight: 700;
  font-size: 1.08rem;
}

.meta-line {
  font-size: 0.84rem;
  color: var(--muted);
}

.badge {
  display: inline-flex;
  width: fit-content;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.18rem 0.5rem;
  border-radius: 999px;
  background: rgba(45, 212, 191, 0.2);
}

.expense-actions {
  display: flex;
  gap: 0.45rem;
}

.mini-btn {
  font-size: 0.78rem;
  padding: 0.4rem 0.6rem;
  border-radius: 0.55rem;
}

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

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(2, 6, 23, 0.4);
  backdrop-filter: blur(5px);
  display: grid;
  place-items: center;
  padding: 1rem;
}

.hidden {
  display: none !important;
}

.modal {
  width: min(760px, 100%);
}

.modal-wide {
  max-height: 88vh;
  overflow: auto;
}

.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
}

.inline-actions {
  display: flex;
  gap: 0.45rem;
}

.icon-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: transparent;
  color: var(--text);
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.5rem;
}

.check-chip {
  display: flex;
  gap: 0.45rem;
  align-items: center;
  border: 1px solid rgba(148, 163, 184, 0.35);
  padding: 0.45rem 0.6rem;
  border-radius: 0.65rem;
}

.settlement-body {
  display: grid;
  gap: 0.65rem;
}

.settlement-item {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  border: 1px solid var(--surface-border);
  border-radius: 0.7rem;
  padding: 0.65rem 0.75rem;
}

.toast {
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%) translateY(140%);
  z-index: 70;
  min-width: 220px;
  max-width: calc(100vw - 2rem);
  border-radius: 0.7rem;
  background: #111827;
  color: #fff;
  text-align: center;
  padding: 0.65rem 0.8rem;
  transition: transform 0.22s ease;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

.loader-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.35);
  display: grid;
  place-items: center;
}

.spinner {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 4px solid rgba(255, 255, 255, 0.45);
  border-top-color: #fff;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.mobile-actions {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 45;
  background: rgba(15, 23, 42, 0.12);
  backdrop-filter: blur(9px);
  padding: 0.5rem;
  display: none;
  gap: 0.5rem;
}

.mobile-actions button {
  flex: 1;
}

@media (max-width: 920px) {
  .form-grid.two-col {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    margin-bottom: 6.2rem;
  }

  .trip-info {
    flex-direction: column;
    align-items: flex-start;
  }

  .totals {
    text-align: left;
  }

  .mobile-actions {
    display: flex;
  }
}

@media print {
  .top-nav,
  .mobile-actions,
  #addExpenseBtn,
  #viewSettlementBtn,
  #copyTripLinkBtn,
  .expense-actions {
    display: none !important;
  }

  body {
    background: #fff !important;
  }
}