:root {
  --bg: #0b0d10;
  --surface: #14181d;
  --surface-2: #1c2128;
  --border: #242a32;
  --text: #e8ecf1;
  --muted: #8590a0;
  --accent: #6ee7b7;
  --accent-strong: #34d399;
  --danger: #f87171;
  --radius: 18px;
  --pad: 20px;
  --max: 440px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7f9;
    --surface: #ffffff;
    --surface-2: #f0f2f5;
    --border: #e3e6eb;
    --text: #0e1116;
    --muted: #6b7280;
    --accent: #059669;
    --accent-strong: #047857;
    --danger: #dc2626;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "tnum";
  min-height: 100dvh;
}

button { font-family: inherit; cursor: pointer; }
input, button { font-size: 16px; }

.screen {
  max-width: var(--max);
  margin: 0 auto;
  padding: max(env(safe-area-inset-top), 12px) var(--pad) max(env(safe-area-inset-bottom), 24px);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Top bar */
.top {
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}
.top h2 {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
  text-align: center;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.icon, .icon-spacer {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--text);
  border: 0;
  border-radius: 12px;
  padding: 0;
}
.icon:hover { background: var(--surface); }
.icon:active { background: var(--surface-2); }
.icon svg { width: 22px; height: 22px; }

/* Hero */
.hero {
  text-align: center;
  padding: 32px 8px 28px;
}
.remaining {
  font-size: clamp(48px, 14vw, 72px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 14px;
  color: var(--text);
}
.remaining.negative { color: var(--danger); }
.sub {
  font-size: 15px;
  color: var(--text);
}
.sub .muted { color: var(--muted); }
.bar {
  height: 6px;
  border-radius: 999px;
  background: var(--surface-2);
  margin: 24px auto 0;
  max-width: 280px;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 999px;
  width: 0;
  transition: width .4s ease;
}
.bar-fill.warn { background: #fbbf24; }
.bar-fill.over { background: var(--danger); }

/* List */
.list-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0 4px 10px;
  margin-top: 12px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.expenses, .periods {
  list-style: none;
  padding: 0;
  margin: 0 0 96px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.expenses li, .periods li {
  background: var(--surface);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 56px;
}
.expenses li.empty-row, .periods li.empty-row {
  justify-content: center;
  color: var(--muted);
}
.expenses .label { flex: 1; min-width: 0; }
.expenses .label .l { display: block; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.expenses .label .d { display: block; font-size: 12px; color: var(--muted); margin-top: 2px; }
.expenses .amt { font-weight: 600; font-variant-numeric: tabular-nums; }
.expenses .amt.pos { color: var(--accent-strong); }
/* Swipe to delete (shared between expenses and periods) */
.expenses li.swipeable, .periods li.swipeable {
  position: relative;
  padding: 0;
  overflow: hidden;
  display: block;
}
.swipe-front {
  background: var(--surface);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 56px;
  transition: transform .25s cubic-bezier(.2,.7,.2,1);
  touch-action: pan-y;
  position: relative;
  z-index: 1;
}
.periods li.swipeable .swipe-front {
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
  cursor: pointer;
}
.swipe-action {
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: 72px;
  background: var(--danger);
  color: #fff;
  border: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  z-index: 0;
}
.swipe-action svg { width: 22px; height: 22px; }
.swipe-action:active { filter: brightness(0.9); }

.periods li {
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
  cursor: pointer;
}
.periods li:hover, .periods li.swipeable:hover .swipe-front { background: var(--surface-2); }
.periods .row1 { display: flex; justify-content: space-between; align-items: center; }
.periods .pname { font-weight: 600; }
.periods .ptag { font-size: 11px; padding: 2px 8px; border-radius: 999px; background: var(--surface-2); color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.periods .ptag.open { background: var(--accent); color: #032018; }
.periods .row2 { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }

.empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  text-align: center;
  color: var(--muted);
}
.empty p { margin: 0; font-size: 15px; }
.big-icon { width: 52px; height: 52px; color: var(--muted); opacity: .5; }

/* FAB */
.fab {
  position: fixed;
  bottom: calc(20px + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  width: 60px; height: 60px;
  border-radius: 50%;
  border: 0;
  background: var(--accent);
  color: #032018;
  display: inline-flex; align-items: center; justify-content: center;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4), 0 4px 10px rgba(0,0,0,0.2);
}
.fab svg { width: 26px; height: 26px; }
.fab:active { transform: translateX(-50%) scale(0.96); }

@media (min-width: 600px) {
  .fab { left: auto; right: calc(50% - var(--max)/2 + 20px); transform: none; }
  .fab:active { transform: scale(0.96); }
}

/* Forms / sheets */
.card.auth {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px 22px;
  margin: auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid var(--border);
}
.card.auth h1 {
  margin: 0 0 8px;
  text-align: center;
  font-size: 22px;
  letter-spacing: -0.01em;
}

input {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 14px 16px;
  border-radius: 12px;
  outline: none;
  width: 100%;
  font-size: 16px;
}
input:focus { border-color: var(--accent); }

button.primary {
  background: var(--accent);
  color: #032018;
  border: 0;
  padding: 14px 18px;
  border-radius: 12px;
  font-weight: 600;
}
button.primary:active { background: var(--accent-strong); }

button.ghost {
  background: transparent;
  color: var(--muted);
  border: 0;
  padding: 14px 18px;
  border-radius: 12px;
  font-weight: 500;
}

.row {
  display: flex;
  gap: 10px;
  margin-top: 4px;
}
.row .primary, .row .ghost { flex: 1; }

.err {
  color: var(--danger);
  font-size: 13px;
  margin: 4px 0 0;
  text-align: center;
}

/* Sheet */
.sheet {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.sheet-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
  animation: fadein .2s ease;
}
.sheet-panel {
  position: relative;
  width: 100%;
  max-width: var(--max);
  background: var(--surface);
  border-radius: 22px 22px 0 0;
  padding: 14px var(--pad) calc(20px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: slideup .25s cubic-bezier(.2,.7,.2,1);
}
.grab {
  width: 40px;
  height: 4px;
  border-radius: 999px;
  background: var(--border);
  margin: 2px auto 8px;
}
.sheet-panel h3 {
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 600;
  text-align: center;
}

@media (min-width: 600px) {
  .sheet { align-items: center; }
  .sheet-panel { border-radius: 22px; max-width: 420px; }
}

@keyframes fadein { from { opacity: 0 } to { opacity: 1 } }
@keyframes slideup { from { transform: translateY(20px); opacity: 0 } to { transform: none; opacity: 1 } }