/* ===== 基础重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --tomato: #ff6347;
  --tomato-dark: #e74c3c;
  --pink: #ffe3e0;
  --pink-soft: #fff5f4;
  --text: #5a4a47;
  --shadow: 0 12px 30px rgba(231, 76, 60, 0.18);
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  /* 渐变背景 */
  background: linear-gradient(135deg, #ffd2cf 0%, #ffb3a7 50%, #ff8e7d 100%);
  color: var(--text);
}

/* ===== 卡片布局 ===== */
.card {
  width: 100%;
  max-width: 420px;
  background: #fff;
  border-radius: 32px;
  padding: 36px 28px 32px;
  text-align: center;
  box-shadow: var(--shadow);
  animation: pop 0.5s ease;
}

@keyframes pop {
  from { transform: scale(0.92); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

.title {
  font-size: 28px;
  color: var(--tomato-dark);
  margin-bottom: 22px;
  letter-spacing: 1px;
}

/* ===== 模式切换 ===== */
.modes {
  display: flex;
  gap: 8px;
  background: var(--pink-soft);
  padding: 6px;
  border-radius: 999px;
  margin-bottom: 28px;
}

.mode-btn {
  flex: 1;
  border: none;
  background: transparent;
  padding: 10px 0;
  border-radius: 999px;
  font-size: 15px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.25s ease;
  font-weight: 600;
}

.mode-btn:hover {
  background: var(--pink);
}

.mode-btn.active {
  background: var(--tomato);
  color: #fff;
  box-shadow: 0 4px 12px rgba(255, 99, 71, 0.4);
}

/* ===== 倒计时 ===== */
.timer {
  font-size: 84px;
  font-weight: 800;
  color: var(--tomato-dark);
  line-height: 1;
  margin: 10px 0;
  font-variant-numeric: tabular-nums;
  letter-spacing: 2px;
}

.status {
  font-size: 15px;
  color: #b08e8a;
  margin-bottom: 24px;
  min-height: 20px;
}

/* ===== 任务输入框 ===== */
.task-input {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid var(--pink);
  border-radius: 16px;
  font-size: 15px;
  color: var(--text);
  outline: none;
  margin-bottom: 24px;
  transition: border-color 0.25s ease;
  background: var(--pink-soft);
}

.task-input:focus {
  border-color: var(--tomato);
  background: #fff;
}

.task-input::placeholder {
  color: #c9a7a3;
}

/* ===== 控制按钮 ===== */
.controls {
  display: flex;
  gap: 12px;
  margin-bottom: 26px;
}

.btn {
  flex: 1;
  border: none;
  padding: 14px 0;
  border-radius: 16px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.btn:active {
  transform: scale(0.95);
}

.btn-primary {
  background: var(--tomato);
  color: #fff;
  box-shadow: 0 8px 18px rgba(255, 99, 71, 0.4);
}

.btn-primary:hover {
  background: var(--tomato-dark);
  box-shadow: 0 10px 22px rgba(231, 76, 60, 0.5);
  transform: translateY(-2px);
}

.btn-ghost {
  background: var(--pink);
  color: var(--tomato-dark);
  box-shadow: 0 4px 12px rgba(255, 99, 71, 0.15);
}

.btn-ghost:hover {
  background: #ffd2cf;
  transform: translateY(-2px);
}

/* ===== 统计 ===== */
.count {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.count span {
  color: var(--tomato-dark);
  font-size: 20px;
  font-weight: 800;
}

/* ===== 移动端适配 ===== */
@media (max-width: 420px) {
  .card { padding: 28px 20px; }
  .timer { font-size: 68px; }
  .title { font-size: 24px; }
}