:root {
  --bg: #0f1420;
  --panel: #161d2e;
  --panel-border: #2a3348;
  --text: #e8ecf4;
  --text-dim: #9aa5bd;
  --accent: #5b8cff;
  --accent-text: #0b0f18;
  --green: #35c281;
  --red: #e5484d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans Arabic", system-ui, sans-serif;
  line-height: 1.5;
}

.page {
  max-width: 640px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.brand h1 {
  font-size: 1.4rem;
  margin: 0;
}

.lang-toggle {
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--text);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  cursor: pointer;
  font-size: 0.9rem;
}

.tagline {
  color: var(--text-dim);
  margin: 0.75rem 0 0.5rem;
}

.privacy-badge {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--green);
  background: rgba(53, 194, 129, 0.1);
  border: 1px solid rgba(53, 194, 129, 0.3);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  margin-bottom: 1.25rem;
}

h2 {
  font-size: 1.1rem;
}

h3 {
  font-size: 0.95rem;
  color: var(--text-dim);
}

.people-section,
.expenses-section,
.results-section {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  margin-bottom: 1.5rem;
}

.inline-form {
  display: flex;
  gap: 0.5rem;
}

input[type="text"],
input[type="number"],
select {
  background: var(--bg);
  border: 1px solid var(--panel-border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  font-size: 1rem;
  width: 100%;
}

input:focus,
select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

button {
  font: inherit;
  border-radius: 8px;
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--panel-border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
}

button:hover {
  filter: brightness(1.15);
}

.chip-list {
  list-style: none;
  padding: 0;
  margin: 0.9rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  padding: 0.3rem 0.4rem 0.3rem 0.8rem;
  font-size: 0.9rem;
}

.chip-remove {
  border: none;
  background: transparent;
  color: var(--text-dim);
  border-radius: 50%;
  width: 1.4rem;
  height: 1.4rem;
  padding: 0;
  line-height: 1;
  font-size: 1rem;
}

.chip-remove:hover {
  color: var(--red);
  filter: none;
}

.hint {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.expense-form {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 0.75rem;
}

.expense-form[hidden] {
  display: none;
}

.amount-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 0 0.5rem;
}

.amount-row span {
  color: var(--text-dim);
}

.amount-row input {
  border: none;
  background: none;
  padding: 0.55rem 0.2rem;
}

.amount-row input:focus {
  outline: none;
}

.field-label {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin: 0.2rem 0 -0.2rem;
}

.split-checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  background: var(--bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 0.3rem 0.6rem;
}

.expenses-list {
  list-style: none;
  padding: 0;
  margin: 0.9rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.expense-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
}

.balances-list,
.settle-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.balances-list li,
.settle-list li {
  background: var(--bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
}

.balance-positive {
  color: var(--green);
}

.balance-negative {
  color: var(--red);
}

.actions {
  margin-bottom: 1rem;
}

.disclaimer {
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 0.75rem;
}

.site-footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--panel-border);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.site-footer a {
  color: var(--accent);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7fb;
    --panel: #ffffff;
    --panel-border: #dde2ee;
    --text: #1a2030;
    --text-dim: #5b6478;
  }
}