:root {
  --green: #2fb574;
  --green-dark: #1f8f59;
  --green-soft: #d9f5e6;
  --ink: #23312b;
  --muted: #8a9a92;
  --line: #e7eeea;
  --card: #ffffff;

  --p-mint: #dff7ec;
  --p-peach: #ffe6da;
  --p-lavender: #ebe4ff;
  --p-sky: #dcefff;
  --p-lemon: #fff5cc;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 64px 16px;
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 20%, #ffe9f0 0, transparent 40%),
    radial-gradient(circle at 85% 10%, #e3f0ff 0, transparent 45%),
    radial-gradient(circle at 70% 90%, #fff4d6 0, transparent 40%),
    linear-gradient(160deg, #e8faf1, #f3f0ff);
  background-attachment: fixed;
}

.card {
  width: 100%;
  max-width: 480px;
  background: var(--card);
  border-radius: 28px;
  padding: 32px 28px 20px;
  box-shadow: 0 24px 60px -24px rgba(35, 80, 60, 0.25), 0 2px 6px rgba(35, 80, 60, 0.05);
  animation: card-in 600ms var(--ease-out) both;
}

@keyframes card-in {
  from { opacity: 0; transform: translateY(16px) scale(0.98); }
}

.date {
  margin: 0 0 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--green);
  letter-spacing: 0.02em;
}

h1 {
  margin: 0 0 24px;
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* 입력 */
.add-form {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.add-form input {
  flex: 1;
  min-width: 0;
  height: 52px;
  padding: 0 18px;
  font: inherit;
  font-size: 16px;
  color: var(--ink);
  background: #f6faf8;
  border: 2px solid transparent;
  border-radius: 16px;
  outline: none;
  transition: border-color 200ms var(--ease-out), background-color 200ms var(--ease-out), box-shadow 200ms var(--ease-out);
}

.add-form input::placeholder { color: #a9b7b0; }

.add-form input:focus {
  background: #fff;
  border-color: var(--green);
  box-shadow: 0 0 0 5px var(--green-soft);
}

.add-form.shake { animation: shake 360ms var(--ease-out); }

@keyframes shake {
  20% { transform: translateX(-6px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(2px); }
}

.add-btn {
  flex: none;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  background: var(--green);
  border: 0;
  border-radius: 16px;
  cursor: pointer;
  transition: transform 160ms var(--ease-out), background-color 160ms, box-shadow 200ms;
  box-shadow: 0 8px 18px -8px rgba(47, 181, 116, 0.8);
}

.add-btn svg {
  width: 22px;
  height: 22px;
  stroke: #fff;
  stroke-width: 2.6;
  stroke-linecap: round;
  fill: none;
  transition: transform 300ms var(--ease-spring);
}

.add-btn:hover { background: var(--green-dark); }
.add-btn:hover svg { transform: rotate(90deg); }
.add-btn:active { transform: scale(0.92); }
.add-btn:focus-visible { outline: 3px solid var(--green-soft); outline-offset: 2px; }

/* 목록 */
.todo-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.todo {
  --bg: var(--p-mint);
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  padding: 14px 12px 14px 14px;
  background: var(--bg);
  border-radius: 16px;
  transition: background-color 300ms var(--ease-out), transform 200ms var(--ease-out), box-shadow 200ms var(--ease-out);
}

.todo[data-color="0"] { --bg: var(--p-mint); }
.todo[data-color="1"] { --bg: var(--p-peach); }
.todo[data-color="2"] { --bg: var(--p-lavender); }
.todo[data-color="3"] { --bg: var(--p-sky); }
.todo[data-color="4"] { --bg: var(--p-lemon); }

.todo:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px -10px rgba(35, 80, 60, 0.35);
}

.todo.done { background: #f3f6f4; }

/* 체크박스 */
.check {
  flex: none;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  padding: 0;
  background: #fff;
  border: 2px solid #b9cbc1;
  border-radius: 9px;
  cursor: pointer;
  transition: background-color 220ms var(--ease-out), border-color 220ms var(--ease-out);
}

.check:hover { border-color: var(--green); }
.check:focus-visible { outline: 3px solid var(--green-soft); outline-offset: 2px; }

.check svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: #fff;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.check path {
  stroke-dasharray: 20;
  stroke-dashoffset: 20;
  transition: stroke-dashoffset 280ms var(--ease-out) 60ms;
}

.todo.done .check {
  background: var(--green);
  border-color: var(--green);
}

.todo.done .check path { stroke-dashoffset: 0; }

.check.pop { animation: pop 380ms var(--ease-spring); }

@keyframes pop {
  0% { transform: scale(1); }
  40% { transform: scale(0.8); }
  100% { transform: scale(1); }
}

/* 본문 + 줄 긋기 */
.text-wrap {
  flex: 1;
  min-width: 0;
}

.text {
  font-size: 16px;
  line-height: 1.45;
  word-break: break-word;
  cursor: text;
  user-select: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 58%;
  background-size: 0% 2px;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
  transition: background-size 380ms var(--ease-out), color 300ms var(--ease-out);
}

.todo.done .text {
  color: var(--muted);
  background-size: 100% 2px;
}

.edit-input {
  width: 100%;
  padding: 4px 8px;
  margin: -6px 0 -6px -8px;
  font: inherit;
  font-size: 16px;
  color: var(--ink);
  background: #fff;
  border: 2px solid var(--green);
  border-radius: 10px;
  outline: none;
  box-shadow: 0 0 0 4px var(--green-soft);
}

/* 삭제 버튼 */
.delete {
  flex: none;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: 10px;
  cursor: pointer;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 180ms var(--ease-out), transform 180ms var(--ease-out), background-color 160ms;
}

.delete svg {
  width: 16px;
  height: 16px;
  stroke: #7d8c85;
  stroke-width: 2.4;
  stroke-linecap: round;
  fill: none;
}

.todo:hover .delete,
.delete:focus-visible { opacity: 1; transform: scale(1); }
.delete:hover { background: rgba(255, 255, 255, 0.8); }
.delete:hover svg { stroke: #e0605a; }
.delete:focus-visible { outline: 3px solid var(--green-soft); }

@media (hover: none) {
  .delete { opacity: 1; transform: none; }
}

/* 빈 상태 */
.empty {
  margin: 8px 0 16px;
  padding: 28px 0;
  text-align: center;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  transition: opacity 300ms var(--ease-out), transform 300ms var(--ease-out);
}

.empty.hidden {
  display: none;
}

/* 하단 */
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--muted);
}

.count-num {
  display: inline-flex;
  min-width: 1ch;
  justify-content: center;
  margin: 0 2px;
  font-weight: 800;
  color: var(--green-dark);
  font-variant-numeric: tabular-nums;
  overflow: hidden;
  vertical-align: bottom;
}

.count-num span { display: inline-block; }

.clear-btn {
  padding: 8px 12px;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 10px;
  cursor: pointer;
  transition: color 160ms, background-color 160ms, opacity 240ms var(--ease-out), transform 240ms var(--ease-out);
}

.clear-btn:hover { color: #d9534f; background: #fff0ef; }
.clear-btn:focus-visible { outline: 3px solid var(--green-soft); }

.clear-btn:disabled {
  opacity: 0;
  transform: translateX(6px);
  pointer-events: none;
}

.hint {
  margin: 14px 0 0;
  text-align: center;
  font-size: 12px;
  color: #b3c0ba;
}

@media (max-width: 480px) {
  body { padding: 24px 16px; }
  .card { padding: 24px 18px 16px; border-radius: 22px; }
  h1 { font-size: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 1ms !important;
    transition-duration: 1ms !important;
    transition-delay: 0ms !important;
  }
}