:root {
  color-scheme: light;
  --bg-start: #f8efe2;
  --bg-end: #d9ebff;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-strong: #ffffff;
  --text: #1d2330;
  --muted: #5d6573;
  --accent: #ff6b3d;
  --accent-dark: #d94d23;
  --border: rgba(29, 35, 48, 0.12);
  --shadow: 0 24px 60px rgba(50, 66, 92, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.9), transparent 34%),
    linear-gradient(135deg, var(--bg-start), var(--bg-end));
}

button,
input {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.todo-card {
  width: min(100%, 640px);
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 28px;
  background: var(--surface);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

.title-row {
  display: flex;
  gap: 16px;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 0.95;
}

.description {
  margin: 10px 0 0;
  color: var(--muted);
}

.todo-count {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 68px;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--surface-strong);
  border: 1px solid var(--border);
  font-weight: 700;
}

.todo-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  margin-bottom: 20px;
}

.todo-form input {
  width: 100%;
  padding: 15px 18px;
  border: 1px solid transparent;
  border-radius: 18px;
  background: var(--surface-strong);
  color: var(--text);
  box-shadow: inset 0 0 0 1px var(--border);
}

.todo-form input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.todo-form button,
.todo-item button {
  border: 0;
  border-radius: 18px;
  cursor: pointer;
  transition:
    transform 0.18s ease,
    background-color 0.18s ease,
    opacity 0.18s ease;
}

.todo-form button {
  padding: 15px 20px;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
}

.todo-form button:hover,
.todo-form button:focus-visible,
.todo-item button:hover,
.todo-item button:focus-visible {
  transform: translateY(-1px);
}

.todo-form button:hover,
.todo-form button:focus-visible {
  background: var(--accent-dark);
}

.todo-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.todo-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border-radius: 20px;
  background: var(--surface-strong);
  border: 1px solid var(--border);
}

.todo-item span {
  word-break: break-word;
}

.todo-item button {
  flex-shrink: 0;
  padding: 10px 14px;
  background: rgba(255, 107, 61, 0.12);
  color: var(--accent-dark);
  font-weight: 700;
}

.empty-state {
  margin: 18px 2px 0;
  color: var(--muted);
}

.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 (max-width: 640px) {
  .todo-card {
    padding: 22px;
    border-radius: 24px;
  }

  .title-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .todo-form {
    grid-template-columns: 1fr;
  }

  .todo-item {
    flex-direction: column;
    align-items: stretch;
  }
}