:root {
  --bg: #eef6ff;
  --panel: #fbfdff;
  --panel-2: #dcecff;
  --panel-3: #f3f8ff;
  --text: #0f2338;
  --muted: #607083;
  --line: #cddff3;
  --line-2: #d9e8f8;
  --accent: #0070ba;
  --accent-dark: #003087;
  --accent-soft: #dcecff;
  --danger: #b24035;
  --danger-soft: #f4dad7;
  --green: #13795b;
  --green-soft: #dff3ea;
  --shadow: 0 16px 40px rgba(15, 35, 56, 0.10);
  --shadow-soft: 0 10px 26px rgba(15, 35, 56, 0.075);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(0, 112, 186, 0.12), transparent 34%),
    var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Display",
    "Segoe UI", Roboto, Arial, sans-serif;
  animation: appFadeIn 420ms ease both;
}

.app {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  min-height: 100dvh;
  padding: 14px 14px calc(92px + env(safe-area-inset-bottom));
}

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: calc(10px + env(safe-area-inset-top)) 0 12px;
  background: linear-gradient(to bottom, var(--bg) 78%, rgba(238, 246, 255, 0));
  backdrop-filter: blur(14px);
}

.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand-mark {
  width: 44px;
  height: 44px;
  position: relative;
  flex: 0 0 44px;
  display: grid;
  place-items: center;
}

.brand-mark img {
  width: 44px;
  height: 44px;
  display: block;
  object-fit: contain;
  filter: drop-shadow(0 8px 14px rgba(0, 48, 135, 0.18));
}

.brand h1 {
  margin: 0;
  font-size: 28px;
  letter-spacing: -0.04em;
  font-weight: 900;
}

.brand span {
  color: var(--muted);
  font-size: 13px;
}

.top-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-shrink: 0;
}

button, input, textarea, select {
  font: inherit;
}

button {
  border: 0;
  border-radius: 16px;
  padding: 12px 14px;
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
  font-weight: 750;
  transition:
    transform 140ms ease,
    background 160ms ease,
    color 160ms ease,
    box-shadow 160ms ease,
    border-color 160ms ease;
}

button:hover {
  box-shadow: 0 8px 18px rgba(15, 35, 56, 0.08);
}

button:active {
  transform: scale(0.985);
}

.primary {
  background: var(--accent);
  color: white;
}

.primary:hover,
.primary:active {
  background: var(--accent-dark);
  box-shadow: 0 12px 24px rgba(0, 112, 186, 0.22);
}

.dark {
  background: var(--text);
  color: var(--panel);
}

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

.good {
  background: var(--green-soft);
  color: var(--green);
}

.ghost {
  background: transparent;
  border: 1px solid var(--line);
}

.ghost:hover {
  background: rgba(251, 253, 255, 0.74);
  border-color: rgba(0, 112, 186, 0.30);
}

.small {
  padding: 8px 10px;
  border-radius: 12px;
  font-size: 13px;
}

.tiny {
  padding: 7px 9px;
  border-radius: 999px;
  font-size: 12px;
}

.nav {
  position: fixed;
  left: 50%;
  bottom: calc(12px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 20;
  width: calc(100% - 28px);
  max-width: 560px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 6px;
  background: rgba(251, 253, 255, 0.86);
  border: 1px solid rgba(205, 223, 243, 0.9);
  border-radius: 22px;
  box-shadow: 0 20px 45px rgba(15, 35, 56, 0.18);
  backdrop-filter: blur(18px);
}

.nav button {
  background: transparent;
  color: var(--muted);
}

.nav button.active {
  background: var(--text);
  color: var(--panel);
}

.page {
  display: block;
}

.hidden {
  display: none !important;
}

.card {
  background: rgba(251, 253, 255, 0.90);
  border: 1px solid rgba(205, 223, 243, 0.92);
  border-radius: 28px;
  padding: 15px;
  margin: 14px 0;
  box-shadow: var(--shadow);
  animation: cardEnter 340ms cubic-bezier(.2, .8, .2, 1) both;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.card:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 42px rgba(15, 35, 56, 0.12);
  border-color: rgba(0, 112, 186, 0.22);
}

.card-head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: start;
  margin-bottom: 12px;
}

.card-head.no-score {
  grid-template-columns: 1fr;
}

.title {
  margin: 0;
  font-size: 24px;
  letter-spacing: -0.05em;
  font-weight: 900;
  line-height: 1.05;
  overflow-wrap: anywhere;
}

.subtitle {
  color: var(--muted);
  font-size: 14px;
  margin-top: 7px;
  line-height: 1.35;
}

.card-tools {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-start;
  margin-top: 8px;
}

.mini-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.mini-stat {
  background: #f3f8ff;
  border: 1px solid #d9e8f8;
  border-radius: 18px;
  padding: 11px;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.mini-stat:hover {
  transform: translateY(-1px);
  border-color: rgba(0, 112, 186, 0.24);
}

.mini-stat b {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
  letter-spacing: 0.02em;
}

.mini-stat span {
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -0.04em;
}

.quick-form {
  background: rgba(251, 253, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 10px;
  display: grid;
  gap: 8px;
  animation: softPop 220ms ease both;
}

.quick-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.details {
  margin-top: 12px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
  animation: softPop 260ms ease both;
}

.form {
  background: var(--panel-3);
  border: 1px solid #d7e7f8;
  border-radius: 22px;
  padding: 10px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.form-title {
  font-weight: 900;
  letter-spacing: -0.02em;
  margin: 4px 4px 2px;
}

.form-row-3 {
  display: grid;
  grid-template-columns: 1fr 120px minmax(0, 140px);
  gap: 8px;
  width: 100%;
  max-width: 100%;
  overflow: hidden;
}

.form-row-3 > * {
  min-width: 0;
  max-width: 100%;
}

input, textarea, select {
  width: 100%;
  min-width: 0;
  border: 1px solid #cddff3;
  background: #fafdff;
  color: var(--text);
  border-radius: 16px;
  padding: 13px 12px;
  outline: none;
  min-height: 46px;
  transition:
    border-color 150ms ease,
    box-shadow 150ms ease,
    background 150ms ease;
}

input[type="date"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  display: block;
  box-sizing: border-box;
  text-align: left;
}

input[type="date"]::-webkit-date-and-time-value {
  text-align: left;
  display: block;
  width: 100%;
  min-width: 0;
}

textarea {
  resize: vertical;
  min-height: 74px;
}

input:focus, textarea:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 112, 186, 0.13);
}

.section-label {
  margin: 8px 4px 2px;
  font-size: 13px;
  color: var(--muted);
  font-weight: 800;
}

.people-box {
  display: grid;
  gap: 8px;
}

.person-row,
.payer-row {
  display: grid;
  gap: 8px;
  align-items: center;
}

.payer-row {
  grid-template-columns: 1fr 110px auto;
}

.person-row {
  grid-template-columns: 1fr 140px auto;
}

.share-control {
  background: #fafdff;
  border: 1px solid #cddff3;
  border-radius: 16px;
  padding: 7px 10px;
  min-width: 0;
}

.share-control label {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  margin-bottom: 2px;
}

.share-control input {
  min-height: 22px;
  padding: 0;
  border: 0;
  box-shadow: none;
  background: transparent;
}

.form-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.form-actions button {
  width: 100%;
}

.debt-list {
  display: grid;
  gap: 8px;
  max-height: 360px;
  overflow-y: auto;
  padding-right: 2px;
}

.debt-item {
  background: #fafdff;
  border: 1px solid var(--line-2);
  border-radius: 20px;
  padding: 12px;
  animation: cardEnter 340ms cubic-bezier(.2, .8, .2, 1) both;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.debt-item:hover {
  transform: translateY(-1px);
  border-color: rgba(0, 112, 186, 0.24);
}

.debt-top {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: start;
}

.debt-name {
  font-weight: 900;
  letter-spacing: -0.02em;
  overflow-wrap: anywhere;
}

.debt-amount {
  font-weight: 900;
  font-size: 18px;
  white-space: nowrap;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  border-radius: 999px;
  background: #e7f2ff;
  color: #36536e;
  font-size: 12px;
  font-weight: 800;
  margin: 4px 6px 0 0;
}

.debt-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.share-note {
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.settlement-list,
.balance-list {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  animation: softPop 260ms ease both;
}

.settlement-row,
.balance-row {
  background: #fafdff;
  border: 1px solid var(--line-2);
  border-radius: 18px;
  padding: 12px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  animation: cardEnter 340ms cubic-bezier(.2, .8, .2, 1) both;
}

.amount-positive {
  color: var(--green);
  font-weight: 900;
}

.amount-negative {
  color: var(--danger);
  font-weight: 900;
}

.section-title {
  margin: 18px 0 0;
  letter-spacing: -0.03em;
}

.chart-wrap {
  background: #fafdff;
  border: 1px solid var(--line-2);
  border-radius: 22px;
  padding: 10px;
  overflow: hidden;
  margin-top: 12px;
  animation: softPop 260ms ease both;
}

canvas {
  width: 100%;
  height: 280px;
  display: block;
  border-radius: 18px;
  background: #f8fbff;
}

.empty {
  text-align: center;
  color: var(--muted);
  padding: 26px 12px;
  background: rgba(255,255,255,0.35);
  border: 1px dashed var(--line);
  border-radius: 22px;
  margin-top: 14px;
}

.note {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
  margin: 8px 0 0;
}

.imex-grid {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  animation: softPop 260ms ease both;
}

.imex-button {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  width: 100%;
  text-align: left;
  background: #fafdff;
  border: 1px solid var(--line-2);
  border-radius: 22px;
  padding: 14px;
}

.imex-button strong {
  display: block;
  font-size: 16px;
  margin-bottom: 3px;
}

.imex-button span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}

.imex-button .arrow {
  font-size: 20px;
  font-weight: 900;
  color: var(--accent);
}

.storage-box {
  margin-top: 14px;
  background: #e7f2ff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.welcome-card {
  overflow: hidden;
  position: relative;
}

.welcome-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at top right, rgba(0, 112, 186, 0.15), transparent 35%),
    radial-gradient(circle at bottom left, rgba(15, 35, 56, 0.07), transparent 42%);
  pointer-events: none;
}

.welcome-content {
  position: relative;
  z-index: 1;
}

.welcome-kicker {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  background: #e7f2ff;
  color: #36536e;
  font-weight: 900;
  font-size: 11px;
  letter-spacing: 0.07em;
  margin-bottom: 14px;
}

.welcome-title {
  margin: 0;
  font-size: 30px;
  letter-spacing: -0.055em;
  font-weight: 950;
  line-height: 1.02;
}

.welcome-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

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

@keyframes cardEnter {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.992);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes softPop {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 560px) {
  .app {
    padding-left: 10px;
    padding-right: 10px;
  }

  .brand h1 {
    font-size: 25px;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
    flex-basis: 40px;
  }

  .brand-mark img {
    width: 40px;
    height: 40px;
  }

  .top-actions {
    gap: 6px;
  }

  .top-actions button {
    padding: 9px 10px;
    font-size: 13px;
  }

  .card {
    border-radius: 24px;
    padding: 12px;
  }

  .title {
    font-size: 21px;
  }

  .mini-grid {
    grid-template-columns: 1fr 1fr;
  }

  .mini-stat {
    padding: 10px;
  }

  .mini-stat span {
    font-size: 17px;
  }

  .form-row-3 {
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .payer-row,
  .person-row {
    grid-template-columns: 1fr;
  }

  .debt-top {
    grid-template-columns: 1fr;
  }

  .debt-amount {
    text-align: left;
  }

  .quick-actions {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}