/* style.css — TripCash */

/* ─── Design tokens ──────────────────────────────────────────── */
:root {
  /* Brand palette */
  --teal:          #14BBA6;
  --teal-dark:     #0F9488;
  --teal-deep:     #0F766E;

  /* Dark mode (default) — Dark Slate theme */
  --bg:            #0F172A;
  --bg-card:       #1E293B;
  --bg-input:      #2D3F55;
  --bg-hover:      #253248;
  --accent:        #14BBA6;
  --accent-dark:   #0F9488;
  --accent-bg:     rgba(20,187,166,0.1);
  --accent-glow:   rgba(20,187,166,0.22);
  --text:          #F8FAFC;
  --text-2:        #94A3B8;
  --text-3:        #475569;
  --border:        rgba(148,163,184,0.12);
  --border-h:      rgba(148,163,184,0.24);
  --danger:        #EF4444;
  --warn:          #F59E0B;
  --r-card:        16px;
  --r-el:          10px;
  --font:          'Inter', 'DM Sans', sans-serif;
  --mono:          'DM Mono', monospace;
  --shadow:        0 2px 8px rgba(0,0,0,0.32);
  --shadow-md:     0 4px 20px rgba(0,0,0,0.42);
  --shadow-lg:     0 12px 40px rgba(0,0,0,0.55);
  --t:             0.15s ease;
}

body.light {
  --bg:            #F8FAFC;
  --bg-card:       #FFFFFF;
  --bg-input:      #F1F5F9;
  --bg-hover:      #F8FAFC;
  --text:          #0F172A;
  --text-2:        #64748B;
  --text-3:        #94A3B8;
  --border:        #E2E8F0;
  --border-h:      #CBD5E1;
  --accent-bg:     rgba(20,187,166,0.08);
  --accent-glow:   rgba(20,187,166,0.14);
  --shadow:        0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:     0 4px 12px rgba(0,0,0,0.09), 0 2px 4px rgba(0,0,0,0.05);
  --shadow-lg:     0 10px 30px rgba(0,0,0,0.12);
}

/* ─── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--t), color var(--t);
}
a { color: var(--accent); text-decoration: none; }

/* ─── Screens ────────────────────────────────────────────────── */
.screen { display: none; }
.screen.active { display: block; }

#screen-loading {
  min-height: 100vh;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 2.5rem;
  background: linear-gradient(150deg, #14BBA6 0%, #0A6660 100%);
}
#screen-loading.active { display: flex; }

.splash-logo { text-align: center; }
.splash-logo-text {
  font-size: 2.25rem !important;
  gap: 0.5rem !important;
}
.splash-logo-text .logo-trip,
.splash-logo-text .logo-cash { color: white !important; }
.splash-tagline {
  color: rgba(255,255,255,0.65);
  font-size: 0.875rem;
  font-weight: 500;
  margin-top: 0.6rem;
  letter-spacing: 0.02em;
}

#screen-not-found {
  min-height: 100vh;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  text-align: center;
  padding: 2rem;
  gap: 0.75rem;
}
#screen-not-found.active { display: flex; }
#screen-not-found h2 { font-size: 1.4rem; font-weight: 700; }
#screen-not-found p  { color: var(--text-2); }

/* ─── Spinner ────────────────────────────────────────────────── */
.spinner {
  width: 36px; height: 36px;
  border: 2.5px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
.splash-spinner {
  border-color: rgba(255,255,255,0.25);
  border-top-color: white;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Auth screen ────────────────────────────────────────────── */
#screen-auth {
  min-height: 100vh;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.25rem;
  background: var(--bg);
}
#screen-auth.active { display: flex; }

/* Subtle radial glow behind auth card (dark mode) */
#screen-auth::before {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 0%, rgba(20,187,166,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  padding: 2.5rem 2.25rem;
  width: 100%;
  max-width: 420px;
  position: relative;
}

.auth-logo { margin-bottom: 0.4rem; }
.auth-tagline {
  color: var(--text-2);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 2rem;
  letter-spacing: 0.01em;
}

/* ─── Logo ───────────────────────────────────────────────────── */
.logo {
  font-weight: 800;
  letter-spacing: -0.04em;
  font-size: 1.25rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  line-height: 1;
}
.logo-trip { color: var(--text); }
.logo-cash { color: var(--accent); }
.logo-pin  { width: 14px; height: 18px; flex-shrink: 0; }
.auth-logo-text { font-size: 1.65rem; gap: 0.5rem; }

/* ─── Auth tabs ──────────────────────────────────────────────── */
.auth-tabs {
  display: flex;
  background: var(--bg-input);
  border-radius: 10px;
  padding: 3px;
  gap: 3px;
  margin-bottom: 1.75rem;
}
.auth-tab-btn {
  flex: 1;
  background: none;
  border: none;
  padding: 0.5rem 0.25rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-2);
  cursor: pointer;
  border-radius: 7px;
  font-family: var(--font);
  transition: background var(--t), color var(--t), box-shadow var(--t);
}
.auth-tab-btn.active {
  background: var(--bg-card);
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
}

/* ─── Guest banner ───────────────────────────────────────────── */
.guest-banner {
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: 10px;
  padding: 0.65rem 1.1rem;
  font-size: 0.82rem;
  color: var(--warn);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.guest-banner button {
  margin-left: auto;
  background: var(--warn);
  color: #0F172A;
  border: none;
  border-radius: 6px;
  padding: 0.3rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  font-family: var(--font);
  cursor: pointer;
  white-space: nowrap;
  transition: opacity var(--t);
}
.guest-banner button:hover { opacity: 0.88; }

/* ─── Trips screen ───────────────────────────────────────────── */
#screen-trips {
  min-height: 100vh;
  display: none;
  flex-direction: column;
}
#screen-trips.active { display: flex; }

/* App header */
.app-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-left  { display: flex; align-items: center; gap: 0.75rem; }
.header-right { display: flex; align-items: center; gap: 0.5rem; }
.header-user {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2);
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-icon-round {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--text-2);
  transition: background var(--t), border-color var(--t), color var(--t);
  flex-shrink: 0;
}
.btn-icon-round:hover {
  background: var(--bg-hover);
  border-color: var(--border-h);
  color: var(--text);
}

/* Trips main content */
.trips-content {
  flex: 1;
  padding: 2rem 1.5rem;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

/* Greeting */
.trips-greeting { margin-bottom: 2.5rem; }
.greeting-title {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.2;
  margin-bottom: 0.35rem;
}
.greeting-title span { color: var(--accent); }
.greeting-sub {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-2);
}

/* Stats row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin-bottom: 2.5rem;
}
.stat-tile {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-card);
  padding: 1.4rem 1.35rem;
  box-shadow: var(--shadow);
  transition: box-shadow var(--t), transform 0.12s;
  cursor: default;
}
.stat-tile:hover {
  box-shadow: 0 6px 28px var(--accent-glow);
  transform: translateY(-1px);
}
.stat-tile-icon  {
  font-size: 1.25rem;
  display: block;
  margin-bottom: 0.6rem;
  line-height: 1;
}
.stat-tile-num   {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.05em;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.4rem;
}
.stat-tile-label {
  font-size: 0.68rem;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

/* Section header */
.section-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.section-hdr h2 {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* ─── Trip cards ─────────────────────────────────────────────── */
.trip-cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.trip-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: border-color var(--t), box-shadow var(--t), transform 0.12s;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.trip-card:hover {
  border-color: rgba(20,187,166,0.4);
  box-shadow: 0 6px 28px var(--accent-glow);
  transform: translateY(-1px);
}
.trip-card:active { transform: scale(0.995); }

.trip-emoji { font-size: 2.25rem; flex-shrink: 0; line-height: 1; }
.trip-info  { flex: 1; min-width: 0; }
.trip-name  {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 0.3rem;
}
.trip-meta {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.trip-right {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}
.trip-chevron {
  font-size: 1.1rem;
  color: var(--text-3);
  transition: color var(--t), transform var(--t);
  line-height: 1;
}
.trip-card:hover .trip-chevron { color: var(--accent); transform: translateX(3px); }

.dot { color: var(--text-3); }

/* Badges */
.badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 100px;
  letter-spacing: 0.03em;
}
.badge-creator { background: var(--accent-bg); color: var(--accent); }
.badge-member  { background: rgba(148,163,184,0.1); color: var(--text-2); }
.badge-ended   { background: rgba(239,68,68,0.1); color: var(--danger); }
.badge-active  { background: var(--accent-bg); color: var(--accent); }
.badge-settled { background: rgba(20,187,166,0.1); color: var(--accent); }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 4rem 1rem 3rem;
  color: var(--text-2);
}
.empty-icon { font-size: 3rem; margin-bottom: 1rem; display: block; }
.empty-state h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.4rem;
}
.empty-state p  { font-size: 0.875rem; }
.empty-hint { color: var(--text-2); font-size: 0.85rem; padding: 0.75rem 0; }

/* ─── Dashboard header ───────────────────────────────────────── */
#screen-dashboard { min-height: 100vh; display: none; flex-direction: column; }
#screen-dashboard.active { display: flex; }

.dash-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 1rem 1.5rem 0;
  position: sticky;
  top: 0;
  z-index: 20;
}
.dash-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}
.btn-back {
  background: none; border: none;
  color: var(--text-2);
  font-size: 0.82rem;
  font-weight: 600;
  font-family: var(--font); cursor: pointer;
  padding: 0; white-space: nowrap;
  transition: color var(--t);
}
.btn-back:hover { color: var(--accent); }

.dash-title {
  flex: 1;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.day-badge {
  background: var(--accent-bg);
  color: var(--accent);
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.22rem 0.75rem;
  border-radius: 100px;
  white-space: nowrap;
  flex-shrink: 0;
  letter-spacing: 0.04em;
  border: 1px solid rgba(20,187,166,0.2);
}

/* ─── Pill tabs ──────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 0;
  max-width: 800px;
  margin: 0 auto;
}
.tabs::-webkit-scrollbar { display: none; }

.tab-btn {
  background: none;
  border: none;
  padding: 0.65rem 1.1rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-2);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
  font-family: var(--font);
  letter-spacing: 0.01em;
  transition: color var(--t), border-color var(--t);
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.dash-content { flex: 1; overflow-y: auto; padding-bottom: 5.5rem; }
.tab-panel    { display: none; padding: 1.5rem; }
.tab-panel.active { display: block; }

/* ─── Cards ──────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 1.4rem 1.35rem;
  margin-bottom: 0.85rem;
  box-shadow: var(--shadow);
}
.card-label {
  font-size: 0.65rem;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 0.75rem;
  font-weight: 600;
}
.big-amount {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
  margin-bottom: 0.2rem;
}
.sub-text { font-size: 0.8rem; font-weight: 500; color: var(--text-2); }

/* ─── Overview tiles ─────────────────────────────────────────── */
.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  margin-bottom: 0.85rem;
}
.ov-tile {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 1.15rem 1.1rem;
  box-shadow: var(--shadow);
  transition: border-color var(--t), box-shadow var(--t), transform 0.12s;
}
.ov-tile:hover {
  border-color: rgba(20,187,166,0.3);
  box-shadow: 0 4px 18px var(--accent-glow);
  transform: translateY(-1px);
}
.ov-tile-icon  { font-size: 1.2rem; display: block; margin-bottom: 0.55rem; line-height: 1; }
.ov-tile-label {
  font-size: 0.64rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  margin-bottom: 0.3rem;
}
.ov-tile-val   {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

/* Invite link */
.share-row { display: flex; gap: 0.5rem; align-items: center; }
.share-input {
  flex: 1;
  font-family: var(--mono);
  font-size: 0.7rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--r-el);
  padding: 0.55rem 0.75rem;
  color: var(--text-2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
.invite-hint { font-size: 0.74rem; color: var(--text-3); margin-top: 0.5rem; }

/* ─── Analytics bars ─────────────────────────────────────────── */
.section-title {
  font-size: 0.65rem;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 1rem;
  font-weight: 600;
}

.bar-row { margin-bottom: 1rem; }
.bar-row:last-child { margin-bottom: 0; }
.bar-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}
.bar-cat-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-2);
  font-weight: 500;
}
.bar-cat-emoji { font-size: 1.1rem; line-height: 1; }
.bar-amt { font-weight: 700; font-size: 0.875rem; }
.bar-pct {
  color: var(--text-3);
  font-weight: 500;
  font-size: 0.78rem;
  margin-left: 0.3rem;
}
.bar-track {
  height: 8px;
  background: var(--bg-input);
  border-radius: 100px;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--teal) 0%, var(--teal-deep) 100%);
  border-radius: 100px;
  transition: width 0.55s cubic-bezier(.4,0,.2,1);
  min-width: 3px;
}

/* ─── Day sections ───────────────────────────────────────────── */
.day-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  margin-bottom: 0.75rem;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.day-hdr {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.day-section.settled .day-hdr {
  cursor: pointer;
  opacity: 0.65;
  transition: opacity var(--t);
}
.day-section.settled .day-hdr:hover { opacity: 1; }
.day-section.settled .day-chevron {
  transition: transform var(--t);
}
.day-section.settled.collapsed .day-chevron {
  transform: rotate(90deg);
}

.day-label  { font-weight: 700; font-size: 0.9rem; letter-spacing: -0.01em; }
.day-total  { margin-left: auto; font-size: 0.85rem; font-weight: 600; color: var(--text-2); }
.day-chevron { font-size: 0.75rem; color: var(--text-3); }
.day-body   { padding: 0.25rem 1.25rem; }

/* ─── Expense cards ──────────────────────────────────────────── */
.expense-card {
  display: flex;
  align-items: center;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
  gap: 0.85rem;
}
.expense-card:last-child { border-bottom: none; }
.exp-cat    { font-size: 1.35rem; flex-shrink: 0; }
.exp-info   { flex: 1; min-width: 0; }
.exp-title  {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: -0.01em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.exp-meta   { display: block; font-size: 0.75rem; font-weight: 500; color: var(--text-2); margin-top: 0.15rem; }
.exp-note   { display: block; font-size: 0.72rem; color: var(--text-3); margin-top: 0.1rem; font-style: italic; }
.exp-right  { display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }
.exp-amount { font-weight: 700; font-size: 0.95rem; letter-spacing: -0.01em; }
.btn-del {
  background: none; border: none;
  color: var(--text-3); font-size: 0.82rem;
  cursor: pointer; padding: 0.25rem 0.35rem;
  border-radius: 6px;
  transition: color var(--t), background var(--t);
}
.btn-del:hover { color: var(--danger); background: rgba(239,68,68,0.1); }

.settle-day-row {
  padding: 0.8rem 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
}

/* Ended banner */
.ended-banner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 1.5rem;
  margin-bottom: 0.85rem;
  text-align: center;
  box-shadow: var(--shadow);
}
.ended-banner h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; letter-spacing: -0.02em; }
.ended-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-top: 0.85rem;
}
.ended-tile {
  background: var(--bg-input);
  border-radius: 10px;
  padding: 0.75rem 0.9rem;
}
.ended-tile-val   { font-weight: 700; font-size: 1.05rem; letter-spacing: -0.02em; }
.ended-tile-label { font-size: 0.7rem; font-weight: 500; color: var(--text-2); margin-top: 0.15rem; }

/* ─── Balances ───────────────────────────────────────────────── */
.balance-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
  gap: 0.75rem;
}
.balance-row:last-of-type { border-bottom: none; }
.bal-info { flex: 1; }
.bal-name { display: block; font-weight: 600; font-size: 0.9rem; letter-spacing: -0.01em; }
.bal-sub  { display: block; font-size: 0.72rem; font-weight: 500; color: var(--text-2); margin-top: 0.1rem; }
.bal-val  { font-weight: 700; font-size: 0.9rem; white-space: nowrap; margin-top: 0.15rem; }
.bal-val.pos  { color: var(--accent); }
.bal-val.neg  { color: var(--danger); }
.bal-val.zero { color: var(--text-3); font-weight: 500; }

.suggestion-row {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}
.suggestion-row:last-child { border-bottom: none; }
.sugg-text    { flex: 1; min-width: 0; font-weight: 500; }
.sugg-amount  { color: var(--accent); font-weight: 700; }
.sugg-actions { display: flex; gap: 0.4rem; align-items: center; flex-wrap: wrap; }

.btn-settle-payment {
  background: var(--accent-bg);
  border: 1px solid rgba(20,187,166,0.25);
  color: var(--accent);
  border-radius: 8px;
  padding: 0.32rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: background var(--t), color var(--t), border-color var(--t);
  white-space: nowrap;
}
.btn-settle-payment:hover {
  background: var(--accent);
  color: #0F172A;
  border-color: var(--accent);
}

.btn-paypal {
  background: #0070ba;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 0.32rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: opacity var(--t);
}
.btn-paypal:hover { opacity: 0.88; }

/* ─── Contacts quick-add ─────────────────────────────────────── */
.contacts-section {
  margin-bottom: 1.1rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--border);
}
.contacts-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-bottom: 0.55rem;
}
.contacts-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.contact-chip {
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: 100px;
  padding: 0.32rem 0.85rem 0.32rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font);
  color: var(--text-2);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: background var(--t), border-color var(--t), color var(--t);
}
.contact-chip::before {
  content: '+';
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}
.contact-chip:hover {
  background: var(--accent-bg);
  border-color: rgba(20,187,166,0.35);
  color: var(--accent);
}

/* ─── Members tab ────────────────────────────────────────────── */
.add-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}
.member-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}
.member-row:last-of-type { border-bottom: none; }
.member-name { font-weight: 600; font-size: 0.9rem; }

/* ─── Activity feed ──────────────────────────────────────────── */
.activity-item {
  display: flex;
  gap: 0.85rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
}
.activity-item:last-child { border-bottom: none; }
.activity-dot {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  margin-top: 0.5rem;
  flex-shrink: 0;
}
.activity-desc { font-size: 0.875rem; font-weight: 500; flex: 1; }
.activity-time { font-size: 0.72rem; color: var(--text-3); margin-top: 0.15rem; }

/* ─── Split type selector ────────────────────────────────────── */
.split-type-row {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-top: 0.25rem;
  background: var(--bg-input);
  border-radius: 10px;
  padding: 3px;
}
.split-type-btn {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-2);
  border-radius: 7px;
  padding: 0.48rem 0.4rem;
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: background var(--t), color var(--t), box-shadow var(--t);
  text-align: center;
}
.split-type-btn.active {
  background: var(--bg-card);
  color: var(--accent);
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
}

.split-equal-grid { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.5rem; }
.split-other-grid { display: grid; gap: 0.4rem; margin-top: 0.5rem; }
.split-person-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
}
.split-person-name  { flex: 1; font-weight: 500; }
.split-person-input { width: 80px; text-align: right; font-size: 0.875rem; }
.split-person-unit  { font-size: 0.78rem; color: var(--text-2); min-width: 1.5rem; }
.split-person-share { font-size: 0.78rem; color: var(--text-2); min-width: 3rem; text-align: right; }
.split-remainder    { font-size: 0.8rem; color: var(--text-2); margin-top: 0.4rem; text-align: right; }
.split-remainder.error { color: var(--danger); }

/* ─── FAB ────────────────────────────────────────────────────── */
.fab {
  position: fixed;
  bottom: 1.75rem; right: 1.5rem;
  background: var(--accent);
  color: #0F172A;
  border: none;
  border-radius: 100px;
  padding: 0.82rem 1.6rem;
  font-size: 0.9rem;
  font-weight: 700;
  font-family: var(--font);
  letter-spacing: -0.01em;
  box-shadow: 0 4px 20px rgba(20,187,166,0.45), 0 1px 4px rgba(0,0,0,0.2);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: background var(--t), box-shadow var(--t), transform 0.1s;
  z-index: 50;
}
.fab:hover  { box-shadow: 0 6px 28px rgba(20,187,166,0.6), 0 2px 6px rgba(0,0,0,0.2); }
.fab:active { transform: scale(0.96); background: var(--accent-dark); }

/* ─── Modal ──────────────────────────────────────────────────── */
.modal {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 100;
  align-items: flex-end;
  justify-content: center;
  backdrop-filter: blur(6px);
}
.modal.open { display: flex; }

.modal-sheet {
  background: var(--bg-card);
  border-radius: 20px 20px 0 0;
  padding: 1.75rem 1.5rem 2.25rem;
  width: 100%;
  max-width: 540px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp .2s cubic-bezier(.22,1,.36,1);
  border-top: 1px solid var(--border);
}
@keyframes slideUp {
  from { transform: translateY(28px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.modal-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}
.modal-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}
.modal-close {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 32px; height: 32px;
  font-size: 0.9rem; cursor: pointer;
  color: var(--text-2);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--t), color var(--t);
}
.modal-close:hover { background: var(--bg-hover); color: var(--text); }

/* ─── Emoji picker ───────────────────────────────────────────── */
.emoji-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.4rem;
}
.emoji-btn {
  background: var(--bg-input);
  border: 2px solid transparent;
  border-radius: 10px;
  font-size: 1.4rem;
  width: 44px; height: 44px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: border-color var(--t), background var(--t);
  line-height: 1;
}
.emoji-btn:hover  { background: var(--bg-hover); }
.emoji-btn.selected {
  border-color: var(--accent);
  background: var(--accent-bg);
}

/* ─── Form elements ──────────────────────────────────────────── */
.form-group { margin-bottom: 1.15rem; }
.form-group label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.45rem;
}
input[type=text], input[type=email],
input[type=password], input[type=number],
input[type=url], select, textarea {
  width: 100%;
  padding: 0.72rem 0.95rem;
  border: 1.5px solid var(--border);
  border-radius: var(--r-el);
  font-size: 0.9rem;
  font-weight: 500;
  font-family: var(--font);
  background: var(--bg-input);
  color: var(--text);
  transition: border-color var(--t), box-shadow var(--t), background var(--t);
  outline: none;
  appearance: none;
}
textarea { resize: vertical; min-height: 70px; line-height: 1.5; }
input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(20,187,166,0.15);
  background: var(--bg-card);
}
input:disabled { opacity: 0.5; cursor: not-allowed; }

.amount-currency-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 110px;
  gap: 0.5rem;
}

.currency-control {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.currency-control label {
  color: var(--text-2);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
}

.currency-control select {
  width: auto;
  min-width: 155px;
  padding: 0.55rem 0.75rem;
}

.exp-converted {
  display: block;
  margin-top: 0.15rem;
  color: var(--text-3);
  font-size: 0.72rem;
  font-weight: 600;
}

.check-label {
  display: flex; align-items: center; gap: 0.4rem;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: 100px;
  padding: 0.3rem 0.75rem 0.3rem 0.5rem;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--t), border-color var(--t);
  color: var(--text-2);
}
.check-label:has(input:checked) {
  background: var(--accent-bg);
  border-color: rgba(20,187,166,0.3);
  color: var(--accent);
}
.check-label input { accent-color: var(--accent); }

/* ─── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  padding: 0.72rem 1.25rem;
  border-radius: var(--r-el);
  border: none;
  font-size: 0.9rem; font-weight: 700;
  letter-spacing: -0.01em;
  font-family: var(--font);
  cursor: pointer;
  transition: background var(--t), opacity var(--t), box-shadow var(--t), transform 0.1s;
}
.btn:active   { transform: scale(0.97); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: #0F172A;
  width: 100%;
  box-shadow: 0 2px 10px rgba(20,187,166,0.3);
}
.btn-primary:hover:not(:disabled) {
  background: var(--accent-dark);
  box-shadow: 0 4px 16px rgba(20,187,166,0.4);
}

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-2);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--border-h);
  color: var(--text);
}

.btn-danger {
  background: rgba(239,68,68,0.1);
  color: var(--danger);
  border: 1.5px solid rgba(239,68,68,0.2);
}
.btn-danger:hover:not(:disabled) {
  background: rgba(239,68,68,0.18);
  border-color: rgba(239,68,68,0.3);
}

.btn-sm   { padding: 0.44rem 0.9rem; font-size: 0.82rem; }
.btn-auto { width: auto; }

.btn-icon {
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  padding: 0.65rem 0.8rem;
  border-radius: var(--r-el);
  font-size: 0.9rem;
  font-family: var(--font);
  font-weight: 600;
  color: var(--text-2);
  cursor: pointer;
  white-space: nowrap;
  transition: border-color var(--t), color var(--t), background var(--t);
}
.btn-icon:hover {
  border-color: var(--border-h);
  color: var(--text);
  background: var(--bg-hover);
}

.btn-link {
  background: none; border: none;
  color: var(--accent); font-weight: 600;
  font-family: var(--font); font-size: inherit;
  cursor: pointer; padding: 0;
}

.btn.loading::after {
  content: '';
  width: 14px; height: 14px;
  border: 2px solid rgba(15,23,42,0.25);
  border-top-color: #0F172A;
  border-radius: 50%;
  animation: spin .6s linear infinite;
  margin-left: 0.4rem;
}
.btn-secondary.loading::after,
.btn-danger.loading::after {
  border-top-color: var(--text-2);
  border-color: var(--border);
}

/* ─── Toast ──────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 5.5rem; left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.65rem 1.35rem;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  opacity: 0; pointer-events: none;
  transition: opacity .2s, transform .2s;
  white-space: nowrap;
  z-index: 300;
  box-shadow: var(--shadow-md);
}
.toast.show  { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: var(--danger); color: white; border-color: transparent; }
.toast.ok    { background: var(--accent); color: #0F172A; border-color: transparent; }

/* ─── Shake ──────────────────────────────────────────────────── */
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%      { transform: translateX(-5px); }
  40%      { transform: translateX(5px); }
  60%      { transform: translateX(-3px); }
  80%      { transform: translateX(3px); }
}
.shake { animation: shake .35s ease; border-color: var(--danger) !important; }

/* ─── Search ─────────────────────────────────────────────────── */
.search-input-wrap { position: relative; margin-bottom: 0.85rem; }
.search-input-wrap input { padding-left: 2rem; }
.search-icon {
  position: absolute;
  left: 0.75rem; top: 50%;
  transform: translateY(-50%);
  font-size: 0.9rem;
  color: var(--text-3);
  pointer-events: none;
}

/* ─── Donut chart ────────────────────────────────────────────── */
.cat-chart-layout {
  display: grid;
  grid-template-columns: 116px 1fr;
  gap: 1.35rem;
  align-items: center;
}
.donut-outer {
  position: relative;
  width: 116px; height: 116px;
  flex-shrink: 0;
}
.donut-ring {
  width: 116px; height: 116px;
  border-radius: 50%;
  -webkit-mask: radial-gradient(transparent 38px, black 39px);
  mask: radial-gradient(transparent 38px, black 39px);
}
.donut-inner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.donut-total {
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1;
}
.donut-sub {
  font-size: 0.58rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--text-3);
  margin-top: 0.2rem;
}
.cat-bars { flex: 1; min-width: 0; }
.bar-cat-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
@media (max-width: 400px) {
  .cat-chart-layout { grid-template-columns: 1fr; }
  .donut-outer { margin: 0 auto; }
}

/* ─── Member avatars ─────────────────────────────────────────── */
.member-avatar {
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
  letter-spacing: 0;
  line-height: 1;
}
.balance-row { align-items: center; }

/* ─── Admin ──────────────────────────────────────────────────── */
.admin-wrap { max-width: 960px; margin: 0 auto; padding: 1.5rem 1.25rem; }
.admin-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.admin-header h1 { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.03em; }
.admin-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 2rem;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 1.1rem;
  text-align: center;
  box-shadow: var(--shadow);
}
.stat-num   {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--accent);
}
.stat-label { font-size: 0.72rem; font-weight: 600; color: var(--text-2); margin-top: 0.2rem; }
.admin-section-title { font-size: 1rem; font-weight: 700; margin: 0.5rem 0 0.75rem; letter-spacing: -0.02em; }
.admin-table-wrap {
  overflow-x: auto;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--r-card);
}
.admin-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.admin-table th {
  text-align: left;
  padding: 0.65rem 0.9rem;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-2);
  background: var(--bg-input);
  border-bottom: 1px solid var(--border);
}
.admin-table td { padding: 0.65rem 0.9rem; border-bottom: 1px solid var(--border); }
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: var(--bg-hover); }
.admin-notice { padding: 2rem; text-align: center; color: var(--text-2); }
.admin-notice.error { color: var(--danger); }
#admin-loading { text-align: center; padding: 2rem; color: var(--text-2); display: none; }
.admin-badge { font-size: 0.65rem; font-weight: 700; padding: 0.15rem 0.5rem; border-radius: 100px; }
.admin-badge.active  { background: var(--accent-bg); color: var(--accent); }
.admin-badge.ended   { background: rgba(239,68,68,0.12); color: var(--danger); }
.admin-badge.guest   { background: rgba(245,158,11,0.12); color: var(--warn); }

/* ─── Desktop ────────────────────────────────────────────────── */
@media (min-width: 600px) {
  .trip-cards-grid { grid-template-columns: 1fr 1fr; }
  .app-header { padding: 0 2.5rem; }
  .trips-content { padding: 2.25rem 2.5rem; }
}
@media (min-width: 768px) {
  .overview-grid { grid-template-columns: repeat(4, 1fr); }
  .tab-panel     { max-width: 800px; margin: 0 auto; }
  .dash-header   { padding-left: 1.5rem; padding-right: 1.5rem; }
  .modal-sheet   { border-radius: 20px; margin: auto; }
  .modal         { align-items: center; }
  .fab           { right: calc(50% - 400px + 1.5rem); }
  .toast         { bottom: 2rem; }
  .admin-stats   { grid-template-columns: repeat(4, 1fr); }
  .stats-row     { gap: 1rem; }
}
@media (max-width: 480px) {
  .app-header    { padding: 0 1.25rem; }
  .trips-content { padding: 1.5rem 1.1rem; }
  .dash-header   { padding: 0.9rem 1.1rem 0; }
  .tab-panel     { padding: 1.1rem; }
  .trip-card     { padding: 1.1rem; }
  .stat-tile-num { font-size: 1.7rem; }
  .greeting-title { font-size: 1.45rem; }
  .auth-card     { padding: 2rem 1.5rem; border-radius: 16px; }
}