/* ===========================
   SpoonForce - Apple 风格样式
   =========================== */

:root {
  --bg: #f8f8fa;
  --bg-secondary: #ffffff;
  --text: #1c1c1e;
  --text-secondary: #8e8e93;
  --accent: #007aff;
  --border: #e5e5ea;
  --danger: #ff3b30;
  --success: #34c759;
  --circle-border: #c7c7cc;
  --circle-shadow: rgba(199, 199, 204, 0.15);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.5);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --bg-secondary: #2c2c2e;
    --text: #f5f5f7;
    --text-secondary: #98989d;
    --border: #38383a;
    --glass-bg: rgba(44, 44, 46, 0.72);
    --glass-border: rgba(56, 56, 58, 0.5);
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  touch-action: none;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

/* --- Header --- */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  padding-top: max(12px, env(safe-area-inset-top));
}

.status {
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-secondary);
  transition: background 0.3s;
}

.status-dot.connected {
  background: var(--success);
  box-shadow: 0 0 6px var(--success);
}

.status-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.btn-lang {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  color: var(--accent);
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

/* --- Main scale area --- */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.weight-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.scale-circle {
  width: 220px;
  height: 220px;
  border: 6px dashed var(--circle-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, box-shadow 0.2s, border-style 0.3s;
  box-shadow: 0 0 20px var(--circle-shadow);
  position: relative;
}

.scale-circle.locked {
  border-style: solid;
}

.placeholder-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
  white-space: pre-line;
  line-height: 1.5;
  pointer-events: none;
}

.placeholder-text.hidden {
  display: none;
}

.weight-display {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 6px;
}

.lock-icon {
  font-size: 1.2rem;
  opacity: 0;
  transition: opacity 0.3s;
  height: 24px;
}

.lock-icon.visible {
  opacity: 1;
  cursor: pointer;
}

.weight-val {
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1;
  transition: transform 0.15s;
}

.unit-label {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.warning {
  font-size: 0.9rem;
  color: var(--danger);
  font-weight: 600;
  height: 24px;
  opacity: 0;
  transition: opacity 0.2s;
}

.warning.visible {
  opacity: 1;
}

/* --- Controls --- */
.controls {
  padding: 16px 20px;
  padding-bottom: max(16px, env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.controls-primary,
.controls-secondary {
  display: flex;
  gap: 12px;
}

.btn {
  flex: 1;
  padding: 14px 20px;
  border: none;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.1s;
}

.btn:active {
  transform: scale(0.96);
  opacity: 0.8;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-secondary {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  color: var(--text);
}

.btn-ghost {
  background: transparent;
  color: var(--danger);
  border: none;
}

/* --- Panels (Calibration & History) --- */
.panel {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 100;
  transition: opacity 0.25s;
}

.panel.hidden {
  display: none;
}

.panel-content {
  background: var(--bg-secondary);
  border-radius: 20px 20px 0 0;
  padding: 24px 20px;
  padding-bottom: max(24px, env(safe-area-inset-bottom));
  width: 100%;
  max-width: 500px;
  max-height: 70vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.panel-header h2 {
  font-size: 1.3rem;
  font-weight: 700;
}

.btn-close {
  background: var(--border);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 1rem;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.panel-actions {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.panel-actions .btn {
  flex: 1;
}

/* --- Calibration --- */
.calib-progress {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.calib-step-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.calib-step-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
}

.calib-input-group {
  margin-bottom: 8px;
}

.calib-input-group.hidden {
  display: none;
}

.calib-input-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.calib-input-group input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 1.1rem;
  background: var(--bg);
  color: var(--text);
  -webkit-user-select: text;
  user-select: text;
}

/* --- History --- */
.hist-list {
  max-height: 40vh;
  overflow-y: auto;
}

.hist-empty {
  text-align: center;
  color: var(--text-secondary);
  padding: 40px 0;
  font-size: 0.95rem;
}

.hist-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.hist-item:last-child {
  border-bottom: none;
}

.hist-item-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hist-weight {
  font-size: 1.1rem;
  font-weight: 600;
}

.hist-time {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.hist-delete-btn {
  background: none;
  border: none;
  color: var(--danger);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 6px 12px;
}

/* --- Compatibility overlay --- */
.compat-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 24px;
}

.compat-overlay.hidden {
  display: none;
}

.compat-card {
  text-align: center;
  max-width: 360px;
}

.compat-icon {
  font-size: 4rem;
  margin-bottom: 16px;
}

.compat-card h2 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.compat-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 12px;
}

.compat-devices {
  font-size: 0.85rem !important;
  padding: 12px;
  background: var(--bg-secondary);
  border-radius: 12px;
  border: 1px solid var(--border);
}

.compat-card button {
  margin-top: 20px;
  padding: 14px 32px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

/* --- Haptic banner --- */
.haptic-banner {
  background: #fff3cd;
  color: #856404;
  padding: 12px 20px;
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.haptic-banner.hidden {
  display: none;
}

@media (prefers-color-scheme: dark) {
  .haptic-banner {
    background: #3a3000;
    color: #ffd900;
  }
}

.haptic-banner p {
  flex: 1;
  line-height: 1.4;
}

.haptic-banner button {
  background: none;
  border: 1px solid currentColor;
  color: inherit;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  white-space: nowrap;
  cursor: pointer;
}