:root {
  --bg: #111113;
  --bg-deep: #1a1a1e;
  --panel: #1c1c20;
  --text: #e5e5ea;
  --muted: #8e8e93;
  --line: rgba(255, 255, 255, 0.08);
  --accent: #7a78f0;
  --accent-deep: #5856d6;
  --accent-soft: rgba(122, 120, 240, 0.12);
  --success: #30d158;
  --warning: #ffd60a;
  --danger: #ff453a;
  --shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --gap: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: -apple-system, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 15px;
  background: var(--bg);
}

button, input {
  font: inherit;
}

a {
  color: var(--accent);
}

/* Layout */

.page-shell {
  max-width: 600px;
  margin: 0 auto;
  padding: 12px 12px 80px;
}

.hero {
  padding: 10px 0;
  text-align: center;
}

.hero .eyebrow {
  margin: 0;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  font-size: 0.72rem;
}

.app {
  display: grid;
  gap: var(--gap);
  margin-top: 8px;
}

.receipt-shell {
  display: grid;
  gap: var(--gap);
}

/* Cards */

.card {
  padding: 16px;
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.card h3 {
  margin: 0 0 2px;
  font-size: 0.95rem;
}

.card p {
  margin: 0 0 6px;
}

.hint {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0;
}

.join-card {
  max-width: 400px;
  margin: 0 auto;
}

.home-card {
  max-width: 500px;
  margin: 0 auto;
}

/* Forms */

label {
  display: grid;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
}

button {
  border: 0;
  cursor: pointer;
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-weight: 500;
  color: #fff;
  background: var(--accent-deep);
  transition: opacity 120ms;
}

button:hover {
  opacity: 0.85;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.35;
}

button.ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

button.secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

button.pay-btn {
  background: #1a7a3a;
  color: #fff;
}

button.unpay-btn {
  background: rgba(255, 255, 255, 0.08);
  color: var(--muted);
  border: 1px solid var(--line);
}

button.small {
  padding: 8px 12px;
  font-size: 0.88rem;
}

/* Stack */

.stack {
  display: grid;
  gap: 12px;
}

/* Pill / Tag */

.pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  background: var(--accent-soft);
  color: var(--accent);
}

.paid-pill {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 0.78rem;
  background: rgba(48, 209, 88, 0.12);
  color: var(--success);
  font-weight: 500;
}

/* Receipt header */

.receipt-header__row {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 12px;
}

.receipt-header h2 {
  margin: 0 0 6px;
}

.receipt-meta {
  display: flex;
  align-items: center;
  gap: 10px;
}

.photo-link {
  align-self: flex-start;
  padding: 8px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 1.2rem;
  line-height: 1;
}

.live-status {
  margin-top: 8px;
}

.viewer-name-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
}

.name-edit-btn {
  padding: 4px 8px;
  font-size: 0.85rem;
  opacity: 0.5;
}

.name-edit-btn:hover {
  opacity: 0.8;
}

/* Items */

.items-list {
  display: grid;
  gap: 8px;
}

.item-card {
  padding: 14px;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--line);
  display: grid;
  gap: 10px;
}

.item-card--dim {
  opacity: 0.45;
}

.item-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}

.item-head h3 {
  margin: 0;
  font-size: 0.95rem;
}

.item-info {
  margin-top: 2px;
}

.taken-label {
  color: var(--danger);
  font-size: 0.82rem;
  opacity: 0.8;
}

/* Claim row */

.claim-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.step-btn {
  width: 38px;
  height: 38px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 1.15rem;
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  border: 1px solid var(--line);
  flex-shrink: 0;
}

.qty-input {
  width: 60px;
  text-align: center;
  padding: 7px 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
}

.qty-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.claim-price {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

/* Claim details */

.claim-details {
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  font-size: 0.85rem;
}

.claim-details summary {
  cursor: pointer;
  padding: 6px 10px;
  color: var(--muted);
}

.claim-details__list {
  padding: 0 10px 8px;
}

/* Summary row */

.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 3px 0;
}

/* Fee card */

.fee-card {
  display: grid;
  gap: 8px;
}

/* Help section */

.help-section summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 0.88rem;
}

.help-content {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.5;
}

.help-content p {
  margin: 0 0 6px;
}

.help-content code {
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.06);
  font-size: 0.9em;
  color: var(--text);
}

/* Collapsible card sections */

details.card > summary {
  cursor: pointer;
  font-weight: 500;
  font-size: 0.95rem;
  list-style: none;
}

details.card > summary::-webkit-details-marker {
  display: none;
}

details.card > summary::before {
  content: "▸ ";
  color: var(--muted);
}

details.card[open] > summary::before {
  content: "▾ ";
}

details.card > .participant-list {
  margin-top: 10px;
}

/* Participants */

.participant-list {
  display: grid;
  gap: 6px;
}

.participant-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg);
  border: 1px solid var(--line);
}

.participant-row--me {
  border-color: var(--accent-deep);
}

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

/* Bottom bar */

.bottom-bar {
  position: sticky;
  bottom: 0;
  z-index: 10;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.5);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.bottom-bar__main {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bottom-bar__info {
  flex: 1;
  min-width: 0;
}

.bottom-bar__info strong {
  font-size: 1.25rem;
  display: block;
  line-height: 1.2;
}

.bottom-bar__info .hint {
  font-size: 0.78rem;
}

.bottom-bar button {
  flex-shrink: 0;
}

/* Status */

.status {
  margin: 0;
  font-size: 0.82rem;
}

.status:empty {
  display: none;
}

.status.error {
  color: var(--danger);
}

.status.success {
  color: var(--success);
}

.status.warning {
  color: var(--warning);
}

.bottom-bar .status {
  margin-top: 6px;
}

/* Mobile */

@media (max-width: 600px) {
  .page-shell {
    padding: 8px 8px 80px;
  }

  .hero {
    padding: 6px 0;
  }

  .card {
    padding: 12px;
    border-radius: var(--radius-md);
  }

  .item-card {
    padding: 10px;
  }

  .step-btn {
    width: 36px;
    height: 36px;
  }

  .qty-input {
    width: 54px;
    font-size: 0.95rem;
    padding: 6px 2px;
  }

  .participant-row {
    padding: 8px 10px;
  }

  .bottom-bar {
    margin: 0 -8px;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    padding: 12px 14px;
  }
}