:root {
  color-scheme: dark;
  --bg: #0f172a;
  --card: #1e293b;
  --border: #334155;
  --text: #ffffff;
  --muted: #cbd5e1;
  --accent: #38bdf8;
  --danger: #fca5a5;
  --success: #34d399;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "SF Pro Display", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

h1 {
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  margin: 0.25rem 0 0.5rem;
}

h2, h3 {
  margin: 0 0 1rem;
  font-weight: 600;
}

p {
  margin: 0;
  color: var(--muted);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  color: var(--accent);
}

.lede {
  max-width: 640px;
  font-size: 1rem;
}

.header-meta {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-left: auto;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(260px, 2fr);
  gap: 1.5rem;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.5rem;
  box-shadow: 0 15px 45px rgba(15, 23, 42, 0.4);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

label {
  font-size: 0.95rem;
  color: var(--muted);
}

input[type="number"],
input[type="text"],
select {
  background: #0b1220;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  color: var(--text);
  font-size: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.split-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.split-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.main-split-grid {
  align-items: flex-start;
}

.main-split-grid .validation {
  grid-column: 1 / -1;
  align-self: flex-start;
  margin-top: 0.2rem;
}

.split-field label {
  font-weight: 600;
}

.validation {
  margin-top: 0.75rem;
  display: flex;
  align-items: center;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(148, 163, 184, 0.15);
  color: var(--muted);
}

.pill-success {
  background: rgba(52, 211, 153, 0.18);
  color: var(--success);
  border: 1px solid rgba(52, 211, 153, 0.5);
}

.pill-warning {
  background: rgba(251, 191, 36, 0.12);
  color: #fbbf24;
  border: 1px solid rgba(251, 191, 36, 0.4);
}

.pill-info {
  border: 1px solid rgba(148, 163, 184, 0.4);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.bucket-amount {
  font-weight: 600;
  color: var(--text);
}

.people-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.person-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
  gap: 0.5rem;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.75rem;
}

@media (max-width: 640px) {
  .person-row {
    grid-template-columns: repeat(2, minmax(0, 1fr)) auto;
  }

  .person-row .percent-field {
    grid-column: span 2;
  }
}

.remove-button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  width: 34px;
  height: 34px;
  border-radius: 10px;
  font-size: 1.4rem;
  line-height: 0;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.remove-button:hover {
  color: var(--danger);
  border-color: var(--danger);
}

.ghost-button {
  margin-top: 1rem;
  background: transparent;
  border: 1px dashed var(--accent);
  color: var(--accent);
  padding: 0.65rem 0.75rem;
  border-radius: 10px;
  font-size: 0.95rem;
  cursor: pointer;
}

.ghost-button:hover {
  background: rgba(56, 189, 248, 0.1);
}

.primary-button {
  background: var(--accent);
  border: none;
  color: #0f172a;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.65rem 1.25rem;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 10px 25px rgba(56, 189, 248, 0.35);
}

.primary-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(56, 189, 248, 0.45);
}

.primary-button:focus-visible {
  outline: 2px solid rgba(56, 189, 248, 0.4);
  outline-offset: 3px;
}

.leftover {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

.leftover.warning {
  color: #fbbf24;
}

.leftover.ok {
  color: var(--success);
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.summary {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.summary-item {
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
  padding-bottom: 0.75rem;
}

.summary-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.summary-item h4 {
  margin: 0;
  font-size: 1rem;
  color: var(--text);
}

.summary-meta {
  font-size: 0.9rem;
  color: var(--muted);
}

.amount {
  margin-top: 0.25rem;
  font-weight: 600;
  color: var(--text);
}

.summary-empty {
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .breakdown-panel {
    order: -1;
  }

  .header-meta {
    width: 100%;
    justify-content: flex-start;
  }
}

@media (max-width: 480px) {
  .card {
    padding: 1.2rem;
  }

  .ghost-button,
  input,
  select {
    font-size: 0.95rem;
  }
}