:root {
  color-scheme: dark;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --bg: #030712;
  --surface: #0f172a;
  --surface-soft: #111827;
  --surface-border: rgba(148, 163, 184, 0.16);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --border: #334155;
  --accent: #5b8dff;
  --accent-soft: #1e293b;
  --danger: #f87171;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  background: radial-gradient(circle at top, #10213c 0%, #030712 55%);
  color: var(--text);
  padding: 22px 16px 16px;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(94, 149, 255, 0.12), transparent 32%);
  pointer-events: none;
}

.phone-shell {
  width: min(100%, 430px);
  position: relative;
  z-index: 1;
}

.app {
  width: 100%;
  background: rgba(15, 23, 42, 0.96);
  border-radius: 28px;
  padding: 20px;
  box-shadow: 0 22px 48px rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(148, 163, 184, 0.12);
}

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 4px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-size: 1.55rem;
  line-height: 1.1;
}

.date-pill {
  background: var(--surface-soft);
  color: var(--accent);
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 0.84rem;
  font-weight: 700;
  white-space: nowrap;
}

.add-card {
  display: flex;
  align-items: stretch;
  gap: 10px;
  margin-bottom: 14px;
}

input[type="text"] {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  font-size: 1rem;
  background: var(--surface-soft);
  color: var(--text);
}

input::placeholder {
  color: var(--muted);
}

input:focus {
  outline: 2px solid rgba(91, 141, 255, 0.25);
  border-color: var(--accent);
}

button {
  border: none;
  border-radius: 14px;
  padding: 14px 16px;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 160ms ease, background-color 160ms ease;
}

button:hover {
  transform: translateY(-1px);
}

#addButton {
  background: var(--accent);
  color: white;
  min-width: 72px;
  flex-shrink: 0;
}

#addButton:hover {
  background: #4a7bf0;
}

.summary {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 60vh;
  overflow-y: auto;
  padding-right: 2px;
}

.checklist::-webkit-scrollbar {
  width: 8px;
}

.checklist::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.26);
  border-radius: 999px;
}

.item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--surface-border);
  border-radius: 18px;
  padding: 14px 14px;
}

.item label {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  min-width: 0;
  width: 100%;
}

.checkbox {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
  flex-shrink: 0;
  text-align: left;
}

.task-text {
  overflow-wrap: anywhere;
  color: var(--text);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-size: 1rem;
  text-align: left;
}

.item-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.edit-btn,
.remove-btn {
  background: transparent;
  color: var(--muted);
  padding: 8px;
  font-size: 1.05rem;
}

.edit-btn:hover {
  color: var(--accent);
}

.remove-btn:hover {
  color: #fda4af;
}

.edit-row {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
}

.edit-input {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 0.95rem;
  background: var(--surface-soft);
  color: var(--text);
}

.save-btn,
.cancel-btn {
  padding: 8px 10px;
  font-size: 0.9rem;
}

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

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

.item.completed .task-text {
  text-decoration: line-through;
  color: var(--muted);
}

.empty-state {
  text-align: center;
  padding: 18px;
  color: var(--muted);
  border: 1px dashed rgba(148, 163, 184, 0.24);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.03);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (min-width: 480px) {
  .app {
    padding: 24px;
  }
}