:root {
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --text: #0f172a;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --overlay: rgba(15, 23, 42, 0.5);
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 4px 12px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 8px 30px rgba(15, 23, 42, 0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --header-h: 56px;
  --fab-size: 56px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

[data-theme="dark"] {
  color-scheme: dark;
}

[data-theme="light"] {
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
  }
}

[data-theme="dark"] {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: #334155;
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --danger: #ef4444;
  --danger-hover: #f87171;
  --overlay: rgba(0, 0, 0, 0.6);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --danger: #ef4444;
    --danger-hover: #f87171;
    --overlay: rgba(0, 0, 0, 0.6);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 4px 12px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100dvh;
}

.hidden {
  display: none !important;
}

.app {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Main */
.main {
  flex: 1;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 20px calc(var(--fab-size) + 32px + var(--safe-bottom));
}

.empty-state {
  text-align: center;
  padding: 64px 24px;
}

.empty-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary);
  box-shadow: var(--shadow);
}

.empty-state h2 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.empty-state p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* Items grid */
.items-grid {
  display: grid;
  gap: 16px;
}

.item-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.item-card:active {
  transform: scale(0.98);
}

.item-card-header {
  margin-bottom: 14px;
}

.item-name {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.item-details {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin-bottom: 16px;
}

.item-details-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 10px;
}

.item-detail {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.item-detail-right {
  align-items: flex-end;
  text-align: right;
}

.item-detail-label {
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.item-detail-value {
  font-size: 0.9375rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.item-purchased {
  font-weight: 500;
  letter-spacing: 0.01em;
}

.item-paid {
  font-size: 1rem;
}

.item-duration {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}

.item-duration-days {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

.item-duration-sep {
  color: var(--text-secondary);
  opacity: 0.5;
  user-select: none;
}

.item-duration-readable {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.item-costs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.cost-block {
  text-align: center;
}

.cost-block.featured .cost-value {
  color: var(--primary);
}

.cost-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.cost-value {
  font-size: 0.9375rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* FAB */
.fab {
  position: fixed;
  right: 20px;
  bottom: calc(20px + var(--safe-bottom));
  width: var(--fab-size);
  height: var(--fab-size);
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease;
  z-index: 20;
}

.fab:hover {
  background: var(--primary-hover);
}

.fab:active {
  transform: scale(0.95);
}

/* Buttons */
.btn-icon {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, color 0.15s ease;
}

.btn-icon:hover {
  background: var(--border);
  color: var(--text);
}

.btn {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  border: none;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
}

.btn-block {
  width: 100%;
}

/* Overlay & Sheet */
.overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
}

@media (min-width: 520px) {
  .overlay {
    align-items: center;
    padding: 20px;
  }
}

.sheet {
  background: var(--bg-card);
  width: 100%;
  max-width: 480px;
  max-height: 90dvh;
  overflow-y: auto;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 24px;
  box-shadow: var(--shadow-lg);
}

@media (min-width: 520px) {
  .sheet {
    border-radius: var(--radius);
  }
}

.sheet-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.sheet-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
}

/* Form */
.form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.field label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.field input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
  transition: border-color 0.15s ease;
}

.field input:focus {
  outline: none;
  border-color: var(--primary);
}

.form-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 8px;
}

.form-actions .btn-danger {
  margin-right: auto;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 4px;
  margin-bottom: 20px;
}

.tab {
  flex: 1;
  padding: 10px 12px;
  border: none;
  background: none;
  border-radius: 8px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.tab.active {
  background: var(--bg-card);
  color: var(--text);
  box-shadow: var(--shadow);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.hint {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.5;
}

#panel-claim .field {
  margin-bottom: 28px;
}

.code-display {
  margin-top: 20px;
  text-align: center;
  padding: 24px;
  background: var(--bg);
  border-radius: var(--radius-sm);
}

.code-value {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  font-variant-numeric: tabular-nums;
  color: var(--primary);
}

.code-expiry {
  margin-top: 8px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.message {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.message.error {
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  color: var(--danger);
}

.message.success {
  background: color-mix(in srgb, #16a34a 12%, transparent);
  color: #16a34a;
}

@media (prefers-color-scheme: dark) {
  .message.success {
    color: #4ade80;
  }
}