:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #1b2430;
  --text-soft: #67707d;
  --line: #e4e8ee;
  --brand: #2f6f6a;
  --brand-soft: #eaf3f2;
  --high: #c2413a;
  --high-bg: #fdeeec;
  --medium: #b07a13;
  --medium-bg: #fdf4e3;
  --low: #3f7a4e;
  --low-bg: #ecf6ef;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(24, 38, 54, 0.06), 0 8px 24px rgba(24, 38, 54, 0.06);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  padding: 48px 20px 64px;
  background: radial-gradient(1200px 500px at 50% -180px, #e6efee 0%, var(--bg) 60%);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
}

.app__header {
  margin-bottom: 26px;
  text-align: center;
}

.app__title {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.app__subtitle {
  margin: 0;
  font-size: 14px;
  color: var(--text-soft);
}

.add-form {
  display: flex;
  gap: 10px;
  padding: 8px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.add-form__input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 12px 14px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: #f7f9fa;
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.16s ease, background 0.16s ease;
}

.add-form__input::placeholder {
  color: #9aa4b0;
}

.add-form__input:focus {
  outline: none;
  background: #fff;
  border-color: #bcd8d5;
}

.add-form__select {
  flex: 0 0 88px;
  padding: 12px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f7f9fa;
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
}

.add-form__select:focus {
  outline: none;
  border-color: #bcd8d5;
}

.add-form__submit {
  flex: 0 0 auto;
  padding: 12px 20px;
  border: none;
  border-radius: 10px;
  background: var(--brand);
  color: #fff;
  font-size: 15px;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.16s ease, transform 0.08s ease;
}

.add-form__submit:hover {
  background: #275e59;
}

.add-form__submit:active {
  transform: translateY(1px);
}

.add-form__submit:disabled {
  background: #9fb5b2;
  cursor: not-allowed;
}

.filters {
  display: flex;
  gap: 8px;
  margin: 18px 0 14px;
}

.filter {
  padding: 7px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--text-soft);
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.16s ease;
}

.filter:hover {
  border-color: #c9d5d3;
  color: var(--text);
}

.filter.is-active {
  background: var(--brand-soft);
  border-color: #bfd9d6;
  color: var(--brand);
  font-weight: 500;
}

.list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.task {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: border-color 0.16s ease, opacity 0.16s ease;
}

.task:hover {
  border-color: #d5dfe6;
}

.task.is-done {
  background: #fafbfc;
}

.task__main {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.task__title {
  font-size: 15.5px;
  line-height: 1.5;
  word-break: break-word;
}

.task.is-done .task__title {
  text-decoration: line-through;
  color: var(--text-soft);
}

.task__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: var(--text-soft);
}

.badge {
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 500;
}

.badge--high {
  color: var(--high);
  background: var(--high-bg);
}

.badge--medium {
  color: var(--medium);
  background: var(--medium-bg);
}

.badge--low {
  color: var(--low);
  background: var(--low-bg);
}

.status {
  color: var(--text-soft);
}

.status--done {
  color: var(--low);
}

.task__actions {
  display: flex;
  gap: 8px;
  flex: 0 0 auto;
}

.btn {
  padding: 8px 13px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  font-size: 13.5px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.16s ease;
  white-space: nowrap;
}

.btn:hover {
  border-color: #c9d5d3;
  background: #f7fafa;
}

.btn--done {
  border-color: #bfd9d6;
  background: var(--brand-soft);
  color: var(--brand);
}

.btn--done:hover {
  background: #dfeeec;
}

.btn--danger {
  color: var(--high);
  border-color: #f0d5d2;
  background: #fffafa;
}

.btn--danger:hover {
  background: var(--high-bg);
  border-color: #e8c3bf;
}

.empty {
  margin: 28px 0 0;
  text-align: center;
  font-size: 14px;
  color: var(--text-soft);
}

.app__footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 26px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--text-soft);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translateX(-50%);
  max-width: 80vw;
  padding: 10px 18px;
  border-radius: 10px;
  background: rgba(27, 36, 48, 0.92);
  color: #fff;
  font-size: 13.5px;
  box-shadow: var(--shadow);
}

@media (max-width: 560px) {
  .add-form {
    flex-wrap: wrap;
  }

  .add-form__input {
    flex: 1 1 100%;
  }

  .add-form__select,
  .add-form__submit {
    flex: 1 1 calc(50% - 5px);
  }

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

  .task__actions {
    width: 100%;
  }

  .task__actions .btn {
    flex: 1 1 auto;
  }
}