/* ============================================
   NA-SEM v1.3 — 移动端PWA样式表
   ============================================ */

:root {
  --bg:        #0a0a0a;
  --bg-card:   #111118;
  --bg-card2:  #1a1a2e;
  --teal:      #4ecdc4;
  --teal-dim:  #2a7a72;
  --red:       #ff6b6b;
  --red-dim:   #8a3a3a;
  --amber:     #ffd93d;
  --white:     #f0f0f0;
  --gray:      #666680;
  --text:      #e8e8f0;
  --border:    #2a2a3e;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  overscroll-behavior: none;
}

/* ── 顶部标题 ── */
.header {
  text-align: center;
  padding: 18px 16px 12px;
  border-bottom: 1px solid var(--border);
}

.header .badge {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--teal);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.header h1 {
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 1px;
}

.header .sub {
  font-size: 11px;
  color: var(--gray);
  margin-top: 2px;
}

/* ── 主容器 ── */
.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px 16px 40px;
}

/* ── 警告提示 ── */
.alert-box {
  background: var(--bg-card);
  border: 1px solid var(--amber);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 20px;
}

.alert-box .alert-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--amber);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.check-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
}

.check-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--teal);
  flex-shrink: 0;
}

.check-item.checked {
  color: var(--teal);
  text-decoration: line-through;
}

/* ── 分区按钮 ── */
.zone-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.zone-btn {
  border: 2px solid var(--border);
  border-radius: 16px;
  padding: 18px 12px;
  background: var(--bg-card);
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
  color: var(--text);
}

.zone-btn:active {
  transform: scale(0.97);
}

.zone-btn.green {
  border-color: var(--teal-dim);
}

.zone-btn.green:active,
.zone-btn.green.active {
  background: rgba(78, 205, 196, 0.12);
  border-color: var(--teal);
  box-shadow: 0 0 20px rgba(78, 205, 196, 0.15);
}

.zone-btn.red {
  border-color: var(--red-dim);
}

.zone-btn.red:active,
.zone-btn.red.active {
  background: rgba(255, 107, 107, 0.12);
  border-color: var(--red);
  box-shadow: 0 0 20px rgba(255, 107, 107, 0.15);
}

.zone-icon {
  font-size: 32px;
  margin-bottom: 6px;
  display: block;
}

.zone-label {
  font-size: 16px;
  font-weight: 700;
  display: block;
  margin-bottom: 2px;
}

.zone-btn.green .zone-label { color: var(--teal); }
.zone-btn.red .zone-label { color: var(--red); }

.zone-sub {
  font-size: 11px;
  color: var(--gray);
  display: block;
}

/* ── 内容区 ── */
.content-section {
  display: none;
}

.content-section.visible {
  display: block;
}

/* ── 卡片 ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
}

.card-title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-title.green { color: var(--teal); }
.card-title.red { color: var(--red); }

/* ── 四字诀步骤 ── */
.steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
  background: var(--bg-card2);
}

.step.green .step-num { border: 2px solid var(--teal); color: var(--teal); }
.step.red .step-num { border: 2px solid var(--red); color: var(--red); }

.step-text h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 2px;
}

.step-text p {
  font-size: 12px;
  color: var(--gray);
  line-height: 1.5;
}

/* ── 呼气计时器 ── */
.timer-wrap {
  text-align: center;
  margin: 24px 0;
}

.timer-ring {
  position: relative;
  width: 180px;
  height: 180px;
  margin: 0 auto 20px;
}

.timer-ring svg {
  transform: rotate(-90deg);
  width: 180px;
  height: 180px;
}

.timer-ring circle {
  fill: none;
  stroke-width: 8;
  stroke-linecap: round;
}

.timer-bg {
  stroke: var(--bg-card2);
}

.timer-progress {
  stroke: var(--teal);
  stroke-dasharray: 502;
  stroke-dashoffset: 502;
  transition: stroke-dashoffset 0.1s linear;
}

.timer-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.timer-phase {
  font-size: 12px;
  color: var(--gray);
  margin-bottom: 2px;
  letter-spacing: 1px;
}

.timer-count {
  font-size: 48px;
  font-weight: 200;
  color: var(--white);
  line-height: 1;
}

.timer-hint {
  font-size: 11px;
  color: var(--gray);
  margin-top: 4px;
}

.timer-btn {
  background: var(--teal);
  color: #0a0a0a;
  border: none;
  border-radius: 50px;
  padding: 12px 36px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 1px;
}

.timer-btn:active {
  transform: scale(0.96);
  background: var(--teal-dim);
  color: var(--white);
}

.timer-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ── 右侧卧提示 ── */
.tip-box {
  background: rgba(78, 205, 196, 0.08);
  border: 1px solid rgba(78, 205, 196, 0.3);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 12px;
  color: var(--gray);
  line-height: 1.6;
  margin-top: 16px;
}

.tip-box strong {
  color: var(--teal);
}

/* ── 停止信号 ── */
.stop-signals {
  margin-top: 16px;
}

.stop-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--red);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.stop-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stop-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text);
  background: var(--bg-card2);
  border-radius: 8px;
  padding: 10px 12px;
}

.stop-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--red);
  flex-shrink: 0;
}

/* ── 底部免责声明 ── */
.footer {
  text-align: center;
  padding: 24px 16px;
  font-size: 10px;
  color: var(--gray);
  line-height: 1.6;
  border-top: 1px solid var(--border);
  margin-top: 16px;
}

/* ── iOS PWA 顶部填充 ── */
body.ios-pwa {
  padding-top: env(safe-area-inset-top);
}

/* ── 动画 ── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.visible .card {
  animation: fadeIn 0.3s ease both;
}