* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  padding: 44px 18px;
  background: linear-gradient(160deg, #151a2b 0%, #0b0f18 55%, #131a24 100%);
  color: #e9edf5;
  font-family: system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

.board {
  max-width: 620px;
  margin: 0 auto;
  background: rgba(22, 28, 40, 0.88);
  border: 1px solid #26303f;
  border-radius: 18px;
  padding: 30px;
  backdrop-filter: blur(6px);
}

.kicker {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #7c9cff;
}

h1 {
  margin: 0 0 8px;
  font-size: 26px;
}

.hint {
  margin: 0 0 24px;
  font-size: 13px;
  color: #8d9aae;
}

#todo-form {
  display: flex;
  gap: 10px;
}

#todo-input {
  flex: 1;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid #2b3648;
  background: #0e1320;
  color: #e9edf5;
  font-size: 14px;
  outline: none;
}

#todo-input:focus { border-color: #5b7cfa; }

#todo-form button {
  padding: 12px 20px;
  border: 0;
  border-radius: 10px;
  background: linear-gradient(135deg, #5b7cfa, #8b5bfa);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}

.filters {
  display: flex;
  gap: 8px;
  margin: 18px 0 10px;
}

.filter {
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid #2b3648;
  background: transparent;
  color: #9aa7bb;
  font-size: 12px;
  cursor: pointer;
}

.filter.is-active {
  border-color: #5b7cfa;
  color: #c3d0ff;
  background: rgba(91, 124, 250, 0.14);
}

.list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid #232d3d;
  background: #101725;
  font-size: 14px;
}

.list li.done .text {
  color: #6c7a90;
  text-decoration: line-through;
}

.list .text {
  flex: 1;
  word-break: break-word;
}

.list button {
  border: 0;
  background: transparent;
  color: #7d8aa0;
  font-size: 13px;
  cursor: pointer;
}

.list button:hover { color: #ff6b81; }

.empty {
  padding: 22px;
  text-align: center;
  color: #6c7a90;
  font-size: 13px;
  border: 1px dashed #26303f;
  border-radius: 10px;
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 18px;
  font-size: 13px;
  color: #8d9aae;
}

.ghost {
  border: 1px solid #2b3648;
  background: transparent;
  color: #9aa7bb;
  padding: 8px 14px;
  border-radius: 9px;
  font-size: 12px;
  cursor: pointer;
}

.ghost:hover { border-color: #ff6b81; color: #ff6b81; }

.links {
  margin-top: 22px;
  display: flex;
  gap: 18px;
  font-size: 13px;
}

.links a { color: #8d9aae; text-decoration: none; }
.links a:hover { color: #5b7cfa; }