* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f0f2f5;
  color: #1a1a2e;
  min-height: 100vh;
}

/* ===== 校准弹窗 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
}

.modal {
  background: #fff;
  border-radius: 16px;
  padding: 40px;
  width: 90%;
  max-width: 800px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  position: relative;
}

.modal h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.modal-desc {
  color: #666;
  font-size: 14px;
  margin-bottom: 24px;
  line-height: 1.5;
}

/* 步骤切换 */
.step {
  display: none;
}

.step.active {
  display: block;
}

.step-choices {
  display: flex;
  gap: 16px;
}

.choice-btn {
  flex: 1;
  padding: 20px 16px;
  border: 2px solid #e0e0e0;
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
}

.choice-btn:hover {
  border-color: #4361ee;
  background: #f8f9ff;
}

.choice-title {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: #1a1a2e;
  margin-bottom: 4px;
}

.choice-desc {
  display: block;
  font-size: 12px;
  color: #999;
}

.btn-back {
  background: none;
  border: none;
  color: #999;
  font-size: 13px;
  cursor: pointer;
  padding: 0;
  margin-bottom: 16px;
}

.btn-back:hover {
  color: #4361ee;
}

.calibration-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}

.tab-btn {
  flex: 1;
  padding: 10px 16px;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: #666;
  transition: all 0.2s;
}

.tab-btn.active {
  border-color: #4361ee;
  color: #4361ee;
  background: #f0f4ff;
}

.tab-btn:hover:not(.active) {
  border-color: #bbb;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* 屏幕尺寸输入 */
.screen-size-input label {
  display: block;
  font-size: 15px;
  margin-bottom: 12px;
  color: #333;
}

.input-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.input-group input {
  flex: 1;
  padding: 12px 16px;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-size: 18px;
  outline: none;
  transition: border-color 0.2s;
}

.input-group input:focus {
  border-color: #4361ee;
}

.input-unit {
  font-size: 16px;
  color: #666;
}

.input-hint {
  font-size: 12px;
  color: #999;
  margin-bottom: 20px;
}

/* 银行卡校准 */
.calibrate-hint {
  font-size: 13px;
  color: #666;
  margin-bottom: 16px;
  line-height: 1.5;
}

.card-preview {
  width: 300px;
  height: 189px;
  border: 2px dashed #4361ee;
  border-radius: 12px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #4361ee;
  font-size: 14px;
  background: #f8f9ff;
  transition: width 0.05s, height 0.05s;
}

.slider-group {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.slider-group input[type="range"] {
  flex: 1;
  accent-color: #4361ee;
}

.slider-value {
  font-size: 13px;
  color: #666;
  min-width: 50px;
  text-align: right;
}

/* 按钮 */
.btn-primary {
  width: 100%;
  padding: 12px;
  background: #4361ee;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: #3451de;
}

.btn-primary.btn-cancel {
  background: #e74c3c;
}

.btn-primary.btn-cancel:hover {
  background: #c0392b;
}

.btn-re.calibrate {
  padding: 6px 14px;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  color: #666;
}

.btn-re.calibrate:hover {
  border-color: #4361ee;
  color: #4361ee;
}

.btn-rotate {
  padding: 6px 14px;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  color: #666;
  transition: all 0.2s;
}

.btn-rotate:hover {
  border-color: #4361ee;
  color: #4361ee;
}

.btn-lang {
  padding: 4px 10px;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  color: #666;
  transition: all 0.2s;
  font-weight: 500;
}

.btn-lang:hover {
  border-color: #4361ee;
  color: #4361ee;
}

.modal .btn-lang {
  position: absolute;
  top: 16px;
  right: 16px;
}

/* ===== 主界面 ===== */
.main-app {
  min-height: 100vh;
}

header {
  background: #fff;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

header h1 {
  font-size: 20px;
  font-weight: 600;
}

.header-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.ppi-display {
  font-size: 14px;
  color: #666;
}

.ppi-display strong {
  color: #4361ee;
}

.app-body {
  display: flex;
  height: calc(100vh - 60px);
}

/* 左侧控制面板 */
.control-panel {
  width: 340px;
  background: #fff;
  border-right: 1px solid #e8e8e8;
  padding: 24px;
  overflow-y: auto;
}

.control-section h3 {
  font-size: 15px;
  margin-bottom: 12px;
  color: #333;
}

.brand-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.brand-tab {
  padding: 5px 12px;
  border: 1px solid #e0e0e0;
  border-radius: 16px;
  background: #fff;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.brand-tab.active {
  background: #4361ee;
  color: #fff;
  border-color: #4361ee;
}

.phone-list {
  max-height: 240px;
  overflow-y: auto;
  margin-bottom: 8px;
}

.search-input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  font-size: 13px;
  outline: none;
  margin-bottom: 10px;
}

.search-input:focus {
  border-color: #4361ee;
}

.phone-item {
  padding: 10px 12px;
  border: 1px solid #eee;
  border-radius: 8px;
  margin-bottom: 6px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.phone-item-info {
  flex: 1;
  min-width: 0;
}

.btn-compare-add {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid #ddd;
  background: #fff;
  color: #4361ee;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.btn-compare-add:hover {
  background: #4361ee;
  color: #fff;
  border-color: #4361ee;
}

.btn-compare-add.in-compare {
  background: #e74c3c;
  color: #fff;
  border-color: #e74c3c;
}

.btn-compare-add.in-compare:hover {
  background: #c0392b;
  border-color: #c0392b;
}

.phone-item:hover {
  border-color: #4361ee;
  background: #f8f9ff;
}

.phone-item.active {
  border-color: #4361ee;
  background: #eef1ff;
}

.phone-item .phone-size {
  font-size: 12px;
  color: #999;
  margin-top: 2px;
}

.phone-item .phone-inch {
  font-size: 12px;
  color: #4361ee;
  font-weight: 500;
}

.phone-fold-tag {
  display: inline-block;
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 4px;
  background: #e8f5e9;
  color: #2e7d32;
  font-weight: 500;
  vertical-align: middle;
}

.phone-fold-tag.folded {
  background: #fce4ec;
  color: #c62828;
}

.divider {
  text-align: center;
  color: #ccc;
  font-size: 13px;
  margin: 20px 0;
  position: relative;
}

.divider::before,
.divider::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 40%;
  height: 1px;
  background: #e0e0e0;
}

.divider::before { left: 0; }
.divider::after { right: 0; }

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

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

.input-row label {
  min-width: 36px;
  font-size: 13px;
  color: #666;
}

.input-row input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  font-size: 14px;
  outline: none;
}

.input-row input:focus {
  border-color: #4361ee;
}

.input-row span {
  font-size: 12px;
  color: #999;
  min-width: 20px;
}

/* 右侧展示区 */
.display-area {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  overflow: auto;
}

.phone-wrapper {
  position: relative;
  transition: width 0.3s, height 0.3s;
}

.phone-outline {
  border: 3px solid #1a1a2e;
  border-radius: 20px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  transition: width 0.3s, height 0.3s;
}

.phone-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.phone-label {
  font-size: 14px;
  font-weight: 600;
  color: #333;
}

.phone-dim {
  font-size: 12px;
  color: #999;
}

.placeholder {
  color: #ccc;
  font-size: 15px;
}

/* 对比容器 */
.compare-container {
  position: absolute;
  top: 0;
  left: 0;
}

.compare-outline {
  position: absolute;
  top: 0;
  left: 0;
  border: 2px dashed;
  border-radius: 20px;
  pointer-events: none;
  transition: width 0.3s, height 0.3s;
}

.compare-label {
  position: absolute;
  bottom: -22px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}

/* 对比托盘 */
.compare-tray {
  position: fixed;
  bottom: 0;
  left: 340px;
  right: 0;
  background: #fff;
  border-top: 1px solid #e8e8e8;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 50;
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.06);
}

.compare-items {
  display: flex;
  gap: 8px;
  flex: 1;
  overflow-x: auto;
}

.compare-tag {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 2px solid;
  border-radius: 16px;
  font-size: 12px;
  white-space: nowrap;
  color: #333;
}

.compare-tag-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.compare-tag-remove {
  background: none;
  border: none;
  font-size: 14px;
  color: #999;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.compare-tag-remove:hover {
  color: #e74c3c;
}

.btn-compare-clear {
  padding: 4px 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  background: #fff;
  font-size: 12px;
  color: #999;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
}

.btn-compare-clear:hover {
  border-color: #e74c3c;
  color: #e74c3c;
}

/* 手机端彩蛋 */
.mobile-block {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
  text-align: center;
  color: #fff;
  padding: 32px;
}

.mobile-block-inner h2 {
  font-size: 22px;
  margin-bottom: 12px;
  color: #fff;
}

.mobile-block-inner p {
  font-size: 15px;
  opacity: 0.9;
  margin-bottom: 8px;
}

.mobile-emoji {
  font-size: 64px;
  margin-bottom: 20px;
}

.mobile-hint {
  margin-top: 20px;
  font-size: 13px;
  opacity: 0.6;
}

.btn-lang-mobile {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}

.btn-lang-mobile:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.6);
  color: #fff;
}

/* Toast 提示 */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  background: #e74c3c;
  color: #fff;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 200;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* 响应式 */
@media (max-width: 768px) {
  .app-body {
    flex-direction: column;
    height: auto;
  }

  .control-panel {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid #e8e8e8;
  }

  .display-area {
    min-height: 500px;
  }

  .modal {
    padding: 24px;
    margin: 16px;
  }
}