/* ================================================================
   Earth API - 价格计算器 v12
   全新重构：3 栏 IDE 风格 / 青色主色 / 品牌色泛光 / 实时状态栏
   参考 newapi 数据卡片 + claude.com 留白 + kimi.com 精致排版
   严格遵循 DESIGN.md 设计系统
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Noto+Sans+SC:wght@300;400;500;600;700&family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
  /* 字体栈（严格遵循 DESIGN.md） */
  --calc-font-display: 'Outfit', 'Noto Sans SC', sans-serif;
  --calc-font-body: 'Outfit', 'Noto Sans SC', sans-serif;
  --calc-font-mono: 'JetBrains Mono', 'Noto Sans SC', monospace;

  /* 主色：青色（DESIGN.md --accent-primary） */
  --calc-accent: #0EA5E9;
  --calc-accent-rgb: 14, 165, 233;
  --calc-accent-hover: #0284C7;
  --calc-accent-soft: rgba(14, 165, 233, 0.12);

  /* 价格色：琥珀（DESIGN.md --accent-secondary） */
  --calc-amber: #F59E0B;
  --calc-amber-rgb: 245, 158, 11;
  --calc-amber-soft: rgba(245, 158, 11, 0.12);

  /* 语义色 */
  --calc-success: #10B981;
  --calc-success-rgb: 16, 185, 129;
  --calc-success-soft: rgba(16, 185, 129, 0.12);
  --calc-warning: #F59E0B;
  --calc-error: #EF4444;
  --calc-error-rgb: 239, 68, 68;
  --calc-error-soft: rgba(239, 68, 68, 0.12);

  /* 背景（DESIGN.md 亮色工作区） */
  --calc-bg-page: #F8FAFC;
  --calc-bg-page-rgb: 248, 250, 252;
  --calc-bg-surface: #FFFFFF;
  --calc-bg-elevated: #FFFFFF;
  --calc-bg-subtle: #F1F5F9;
  --calc-bg-subtle-rgb: 241, 245, 249;
  --calc-bg-glass: rgba(255, 255, 255, 0.72);
  --calc-bg-glass-strong: rgba(255, 255, 255, 0.92);

  /* 文本（DESIGN.md 冷色调中性） */
  --calc-text: #0F172A;
  --calc-text-rgb: 15, 23, 42;
  --calc-text-secondary: #475569;
  --calc-text-muted: #64748B;
  --calc-text-placeholder: #94A3B8;
  --calc-text-on-primary: #FFFFFF;

  /* 边框 */
  --calc-border: #E2E8F0;
  --calc-border-strong: #CBD5E1;
  --calc-border-subtle: #F1F5F9;

  /* 圆角（DESIGN.md concentric radius） */
  --calc-radius-sm: 6px;
  --calc-radius-md: 10px;
  --calc-radius-lg: 12px;
  --calc-radius-xl: 16px;
  --calc-radius-2xl: 20px;
  --calc-radius-full: 999px;

  /* 阴影（DESIGN.md scale） */
  --calc-shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --calc-shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.06);
  --calc-shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06), 0 2px 4px rgba(15, 23, 42, 0.04);
  --calc-shadow-lg: 0 12px 24px rgba(15, 23, 42, 0.08), 0 4px 8px rgba(15, 23, 42, 0.04);
  --calc-shadow-xl: 0 24px 48px rgba(15, 23, 42, 0.12), 0 8px 16px rgba(15, 23, 42, 0.06);

  /* 动效 */
  --calc-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --calc-ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --calc-ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* 间距 */
  --calc-space-1: 4px;
  --calc-space-2: 8px;
  --calc-space-3: 12px;
  --calc-space-4: 16px;
  --calc-space-6: 24px;
  --calc-space-8: 32px;
  --calc-space-12: 48px;
  --calc-space-16: 64px;
}

/* ================================================================
   Reset & Base
   ================================================================ */

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

html {
  color-scheme: light;
  /* scrollbar-gutter: stable 让滚动条空间始终保留，
     打开模态锁滚动时不产生横向位移 */
  scrollbar-gutter: stable;
}

body {
  font-family: var(--calc-font-body);
  background: var(--calc-bg-page);
  color: var(--calc-text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* 强制所有元素继承字体平滑，消除中文锯齿 */
*,
*::before,
*::after {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

input {
  font-family: inherit;
}

img {
  max-width: 100%;
  display: block;
}

/* ================================================================
   背景层：极淡青色光晕 + 网格点缀
   ================================================================ */

.calc-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(var(--calc-accent-rgb), 0.08) 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(var(--calc-amber-rgb), 0.05) 0%, transparent 60%),
    var(--calc-bg-page);
}

.calc-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 80%);
  opacity: 0.5;
}

/* ================================================================
   页面骨架
   ================================================================ */

.calc-page {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.calc-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 32px;
}

.calc-main {
  flex: 1;
  padding: 32px 0 80px;
}

/* ================================================================
   Page Head - 不对称 Hero
   ================================================================ */

.calc-page-head {
  padding: 32px 0 24px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--calc-ease), transform 0.7s var(--calc-ease);
}

.calc-page-head.visible {
  opacity: 1;
  transform: translateY(0);
}

.calc-page-head .calc-container {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: end;
}

.calc-page-titles {
  min-width: 0;
}

.calc-page-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border-radius: var(--calc-radius-full);
  border: 1px solid var(--calc-border);
  background: var(--calc-bg-surface);
  font-family: var(--calc-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--calc-text-secondary);
  margin-bottom: 14px;
}

.calc-page-label::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--calc-accent);
  box-shadow: 0 0 8px rgba(var(--calc-accent-rgb), 0.6);
}

.calc-page-title {
  font-family: var(--calc-font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--calc-text);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 10px;
  text-wrap: balance;
}

.calc-page-desc {
  font-size: 1rem;
  color: var(--calc-text-secondary);
  max-width: 560px;
  line-height: 1.65;
  text-wrap: pretty;
}

.calc-page-stats {
  display: flex;
  gap: 12px;
  flex-shrink: 0;
}

.calc-page-stat {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  padding: 14px 20px;
  border-radius: var(--calc-radius-lg);
  background: var(--calc-bg-surface);
  border: 1px solid var(--calc-border);
  box-shadow: var(--calc-shadow-xs);
  min-width: 100px;
  transition: transform 0.25s var(--calc-ease), box-shadow 0.25s var(--calc-ease);
}

.calc-page-stat:hover {
  transform: translateY(-2px);
  box-shadow: var(--calc-shadow-md);
}

.calc-page-stat-num {
  font-family: var(--calc-font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--calc-text);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.calc-page-stat-label {
  font-size: 0.72rem;
  color: var(--calc-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ================================================================
   工作区：3 栏 IDE 风格布局
   左：步骤导航 (240px) / 中：工作面板 (1fr) / 右：实时状态栏 (320px)
   ================================================================ */

.calc-workspace {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--calc-ease), transform 0.8s var(--calc-ease);
}

.calc-workspace.visible {
  opacity: 1;
  transform: translateY(0);
}

.calc-workspace .calc-container {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr) 320px;
  gap: 20px;
  align-items: stretch;
}

/* ================================================================
   左栏：步骤导航（垂直时间线）
   ================================================================ */

.calc-sidebar {
  position: sticky;
  top: 92px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-self: flex-start;
  max-height: calc(100vh - 110px);
}

.calc-sidebar-card {
  background: var(--calc-bg-glass-strong);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius-xl);
  padding: 20px;
  box-shadow: var(--calc-shadow-sm);
}

.calc-sidebar-label {
  display: block;
  font-family: var(--calc-font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--calc-text-muted);
  margin-bottom: 14px;
}

.calc-progress-ring {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.calc-progress-circle {
  position: relative;
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

.calc-progress-circle svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.calc-progress-circle-track {
  fill: none;
  stroke: var(--calc-border);
  stroke-width: 4;
}

.calc-progress-circle-fill {
  fill: none;
  stroke: var(--calc-accent);
  stroke-width: 4;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.5s var(--calc-ease);
}

.calc-progress-num {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--calc-font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--calc-accent);
}

.calc-progress-info {
  flex: 1;
  min-width: 0;
}

.calc-progress-info-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--calc-text);
  margin-bottom: 2px;
}

.calc-progress-info-sub {
  font-size: 0.75rem;
  color: var(--calc-text-muted);
}

.calc-step-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
}

.calc-step-nav::before {
  content: '';
  position: absolute;
  left: 21px;
  top: 22px;
  bottom: 22px;
  width: 2px;
  background: var(--calc-border);
  z-index: 0;
}

.calc-step-link {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px;
  border-radius: var(--calc-radius-md);
  text-align: left;
  color: var(--calc-text-secondary);
  background: transparent;
  border: 1px solid transparent;
  transition: all 0.2s var(--calc-ease);
}

.calc-step-link:hover {
  background: var(--calc-bg-subtle);
  color: var(--calc-text);
}

.calc-step-link.active {
  background: var(--calc-accent-soft);
  color: var(--calc-accent);
  border-color: rgba(var(--calc-accent-rgb), 0.2);
}

.calc-step-link.done {
  color: var(--calc-accent);
}

.calc-step-link-dot {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--calc-bg-surface);
  border: 2px solid var(--calc-border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--calc-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--calc-text-muted);
  transition: all 0.25s var(--calc-ease);
}

.calc-step-link.active .calc-step-link-dot {
  background: var(--calc-accent);
  border-color: var(--calc-accent);
  color: var(--calc-text-on-primary);
  box-shadow: 0 0 0 4px rgba(var(--calc-accent-rgb), 0.15);
}

.calc-step-link.done .calc-step-link-dot {
  background: var(--calc-accent);
  border-color: var(--calc-accent);
  color: var(--calc-text-on-primary);
}

.calc-step-link-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.calc-step-link-text strong {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.3;
}

.calc-step-link-text small {
  font-size: 0.72rem;
  color: var(--calc-text-muted);
  line-height: 1.3;
}

/* ================================================================
   中栏：工作面板
   ================================================================ */

.calc-panel {
  background: var(--calc-bg-surface);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius-xl);
  box-shadow: var(--calc-shadow-sm);
  display: flex;
  flex-direction: column;
  min-height: 620px;
  overflow: hidden;
}

.calc-panel-inner {
  flex: 1;
  min-height: 0;
  padding: 32px;
  overflow-y: auto;
  overflow-x: hidden;
}

.calc-panel-inner::-webkit-scrollbar {
  width: 6px;
}

.calc-panel-inner::-webkit-scrollbar-track {
  background: transparent;
}

.calc-panel-inner::-webkit-scrollbar-thumb {
  background: var(--calc-border-strong);
  border-radius: 3px;
}

.calc-panel-inner::-webkit-scrollbar-thumb:hover {
  background: var(--calc-text-muted);
}

.calc-wizard-step {
  display: none;
  animation: stepIn 0.4s var(--calc-ease) both;
}

.calc-wizard-step.active {
  display: block;
}

@keyframes stepIn {
  from {
    opacity: 0;
    transform: translateX(14px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.calc-step-header {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--calc-border-subtle);
}

.calc-step-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--calc-font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--calc-accent);
  margin-bottom: 8px;
}

.calc-step-eyebrow::before {
  content: '';
  width: 16px;
  height: 1px;
  background: var(--calc-accent);
}

.calc-step-header h2 {
  font-family: var(--calc-font-display);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--calc-text);
  letter-spacing: -0.01em;
  margin-bottom: 6px;
  text-wrap: balance;
}

.calc-step-header p {
  font-size: 0.92rem;
  color: var(--calc-text-secondary);
  line-height: 1.6;
  text-wrap: pretty;
}

/* ================================================================
   Step 1：沙箱配置
   ================================================================ */

.calc-config-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

.calc-config-card {
  position: relative;
  padding: 20px;
  border-radius: var(--calc-radius-lg);
  background: var(--calc-bg-subtle);
  border: 1px solid var(--calc-border);
  transition: border-color 0.25s var(--calc-ease), box-shadow 0.25s var(--calc-ease);
  overflow: hidden;
}

.calc-config-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--calc-accent);
  opacity: 0;
  transition: opacity 0.25s var(--calc-ease);
}

.calc-config-card:hover {
  border-color: rgba(var(--calc-accent-rgb), 0.3);
  box-shadow: var(--calc-shadow-sm);
}

.calc-config-card:hover::before {
  opacity: 1;
}

.calc-config-card-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--calc-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.calc-config-card-label svg {
  width: 14px;
  height: 14px;
  color: var(--calc-accent);
}

.calc-config-card-value {
  display: flex;
  align-items: center;
  gap: 10px;
}

.calc-config-card-value code {
  flex: 1;
  min-width: 0;
  font-family: var(--calc-font-mono);
  font-size: 0.85rem;
  color: var(--calc-text);
  background: var(--calc-bg-surface);
  border: 1px solid var(--calc-border);
  padding: 10px 12px;
  border-radius: var(--calc-radius-md);
  word-break: break-all;
  overflow-wrap: anywhere;
  font-variant-numeric: tabular-nums;
}

.calc-config-card-value code.endpoint-url {
  font-size: 0.78rem;
}

/* Keys section */
.calc-keys-section {
  margin-bottom: 24px;
}

.calc-keys-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.calc-keys-header h3 {
  font-family: var(--calc-font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--calc-text);
  margin-bottom: 4px;
}

.calc-keys-header p {
  font-size: 0.82rem;
  color: var(--calc-text-muted);
}

.calc-key-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.calc-key-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--calc-radius-md);
  background: var(--calc-bg-surface);
  border: 1px solid var(--calc-border);
  animation: itemSlideIn 0.3s var(--calc-ease) both;
  animation-delay: calc(var(--item-index, 0) * 50ms);
  transition: border-color 0.2s var(--calc-ease), transform 0.2s var(--calc-ease), box-shadow 0.2s var(--calc-ease);
}

.calc-key-item:hover {
  border-color: var(--calc-border-strong);
  box-shadow: var(--calc-shadow-sm);
  transform: translateX(3px);
}

.calc-key-item.inactive {
  opacity: 0.6;
}

@keyframes itemSlideIn {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.calc-key-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  flex: 1;
}

.calc-key-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--calc-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-key-prefix {
  font-family: var(--calc-font-mono);
  font-size: 0.78rem;
  color: var(--calc-text-muted);
  font-variant-numeric: tabular-nums;
}

.calc-key-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.calc-key-empty {
  text-align: center;
  padding: 32px 16px;
  color: var(--calc-text-muted);
  font-size: 0.86rem;
  border: 1px dashed var(--calc-border-strong);
  border-radius: var(--calc-radius-md);
  background: var(--calc-bg-surface);
}

.calc-key-empty svg {
  width: 28px;
  height: 28px;
  margin: 0 auto 10px;
  color: var(--calc-text-placeholder);
}

.calc-key-create {
  display: flex;
  gap: 10px;
}

.calc-key-create input {
  flex: 1;
  height: 42px;
  padding: 0 14px;
  border-radius: var(--calc-radius-md);
  border: 1px solid var(--calc-border);
  background: var(--calc-bg-surface);
  color: var(--calc-text);
  font-size: 0.92rem;
  outline: none;
  transition: border-color 0.2s var(--calc-ease), box-shadow 0.2s var(--calc-ease);
}

.calc-key-create input:hover {
  border-color: var(--calc-border-strong);
}

.calc-key-create input:focus {
  border-color: var(--calc-accent);
  box-shadow: 0 0 0 3px rgba(var(--calc-accent-rgb), 0.12);
}

.calc-key-create input::placeholder {
  color: var(--calc-text-placeholder);
}

/* Sandbox flow diagram */
.calc-flow-section {
  margin-top: 28px;
  padding: 20px;
  border-radius: var(--calc-radius-lg);
  background: var(--calc-bg-subtle);
  border: 1px solid var(--calc-border);
}

.calc-flow-title {
  font-family: var(--calc-font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--calc-text-muted);
  margin-bottom: 14px;
}

.calc-flow-diagram {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.calc-flow-node {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 8px;
  border-radius: var(--calc-radius-md);
  background: var(--calc-bg-surface);
  border: 1px solid var(--calc-border);
  text-align: center;
  transition: transform 0.25s var(--calc-ease), border-color 0.25s var(--calc-ease);
}

.calc-flow-node:hover {
  transform: translateY(-2px);
  border-color: rgba(var(--calc-accent-rgb), 0.3);
}

.calc-flow-node-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--calc-accent-soft);
  color: var(--calc-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.calc-flow-node-icon svg {
  width: 18px;
  height: 18px;
}

.calc-flow-node-text {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--calc-text);
  line-height: 1.3;
}

.calc-flow-arrow {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--calc-text-placeholder);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: flowArrow 2s var(--calc-ease) infinite;
}

.calc-flow-arrow svg {
  width: 100%;
  height: 100%;
}

@keyframes flowArrow {
  0%, 100% { transform: translateX(0); opacity: 0.6; }
  50% { transform: translateX(3px); opacity: 1; }
}

/* ================================================================
   Step 2：模型选择
   ================================================================ */

.calc-model-toolbar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.calc-model-searchbox {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  height: 44px;
  border-radius: var(--calc-radius-md);
  border: 1px solid var(--calc-border);
  background: var(--calc-bg-surface);
  transition: border-color 0.2s var(--calc-ease), box-shadow 0.2s var(--calc-ease);
}

.calc-model-searchbox:focus-within {
  border-color: var(--calc-accent);
  box-shadow: 0 0 0 3px rgba(var(--calc-accent-rgb), 0.12);
}

.calc-model-searchbox svg {
  width: 16px;
  height: 16px;
  color: var(--calc-text-muted);
  flex-shrink: 0;
}

.calc-model-searchbox input {
  flex: 1;
  height: 100%;
  border: none;
  background: transparent;
  color: var(--calc-text);
  font-size: 0.92rem;
  outline: none;
}

.calc-model-searchbox input::placeholder {
  color: var(--calc-text-placeholder);
}

.calc-model-filter {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 14px;
  height: 44px;
  border-radius: var(--calc-radius-md);
  border: 1px solid var(--calc-border);
  background: var(--calc-bg-surface);
  color: var(--calc-text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s var(--calc-ease);
}

.calc-model-filter:hover {
  border-color: var(--calc-border-strong);
  color: var(--calc-text);
}

.calc-model-filter.active {
  background: var(--calc-accent-soft);
  border-color: rgba(var(--calc-accent-rgb), 0.3);
  color: var(--calc-accent);
}

.calc-model-filter svg {
  width: 14px;
  height: 14px;
}

/* Model grid：2列网格（响应式 1列） */
.calc-model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  max-height: 540px;
  overflow-y: auto;
  padding-right: 4px;
  margin-bottom: 16px;
}

.calc-model-grid::-webkit-scrollbar {
  width: 6px;
}

.calc-model-grid::-webkit-scrollbar-track {
  background: transparent;
}

.calc-model-grid::-webkit-scrollbar-thumb {
  background: var(--calc-border-strong);
  border-radius: 3px;
}

/* Model card：与 market.css 一致的品牌色泛光 + 图标摆动 */
.calc-model-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--calc-radius-lg);
  background: var(--calc-bg-surface);
  border: 1px solid var(--calc-border);
  cursor: pointer;
  animation: cardFadeIn 0.3s var(--calc-ease) both;
  animation-delay: calc(var(--item-index, 0) * 30ms);
  transition: transform 0.25s var(--calc-ease), border-color 0.25s var(--calc-ease), box-shadow 0.25s var(--calc-ease);
  overflow: hidden;
}

@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 聚光灯效果：跟随光标 + 品牌色 */
.calc-model-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(220px circle at var(--mx, 50%) var(--my, 50%),
    rgba(var(--card-glow-rgb, var(--calc-accent-rgb)), 0.18),
    transparent 60%);
  opacity: 0;
  transition: opacity 0.25s var(--calc-ease);
  pointer-events: none;
  z-index: 0;
}

/* 卡片底部品牌色泛光 */
.calc-model-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(ellipse 90% 60% at 50% 110%,
      rgba(var(--card-glow-rgb, var(--calc-accent-rgb)), 0.12),
      transparent 65%);
  pointer-events: none;
  z-index: 0;
  opacity: 0.8;
  transition: opacity 0.3s var(--calc-ease);
}

.calc-model-card:hover {
  transform: translateY(-2px);
  border-color: rgba(var(--card-glow-rgb, var(--calc-accent-rgb)), 0.4);
  box-shadow:
    var(--calc-shadow-md),
    0 0 0 1px rgba(var(--card-glow-rgb, var(--calc-accent-rgb)), 0.3),
    0 8px 20px rgba(var(--card-glow-rgb, var(--calc-accent-rgb)), 0.18);
}

.calc-model-card:hover::before {
  opacity: 1;
}

.calc-model-card:hover::after {
  opacity: 1;
}

.calc-model-card.selected {
  border-color: var(--calc-accent);
  background: var(--calc-accent-soft);
}

.calc-model-card.selected::after {
  opacity: 1;
}

.calc-model-card > * {
  position: relative;
  z-index: 1;
}

.calc-model-card-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--calc-bg-subtle);
  border: 1px solid var(--calc-border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
  transition: transform 0.3s var(--calc-ease), box-shadow 0.3s var(--calc-ease);
}

.calc-model-card:hover .calc-model-card-icon {
  animation: iconWobble 0.55s var(--calc-ease);
  box-shadow: 0 4px 12px rgba(var(--card-glow-rgb, var(--calc-accent-rgb)), 0.22);
}

@keyframes iconWobble {
  0%   { transform: scale(1.06) rotate(0deg); }
  25%  { transform: scale(1.10) rotate(-5deg); }
  50%  { transform: scale(1.09) rotate(4deg); }
  75%  { transform: scale(1.08) rotate(-2deg); }
  100% { transform: scale(1.08) rotate(0deg); }
}

.calc-model-card-icon-img {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.calc-model-card-icon-text {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--calc-text);
}

.calc-model-card-info {
  flex: 1;
  min-width: 0;
}

.calc-model-card-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--calc-text);
  margin-bottom: 3px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-model-card-price {
  font-family: var(--calc-font-mono);
  font-size: 0.76rem;
  color: var(--calc-text-muted);
  font-variant-numeric: tabular-nums;
}

.calc-model-card-check {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid var(--calc-border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: transparent;
  flex-shrink: 0;
  transition: all 0.2s var(--calc-ease);
}

.calc-model-card.selected .calc-model-card-check {
  background: var(--calc-accent);
  border-color: var(--calc-accent);
  color: var(--calc-text-on-primary);
}

.calc-model-card-check svg {
  width: 12px;
  height: 12px;
}

.calc-model-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px 16px;
  color: var(--calc-text-muted);
  font-size: 0.9rem;
  border: 1px dashed var(--calc-border-strong);
  border-radius: var(--calc-radius-lg);
  background: var(--calc-bg-surface);
}

.calc-model-empty svg {
  width: 36px;
  height: 36px;
  margin: 0 auto 12px;
  color: var(--calc-text-placeholder);
}

/* ================================================================
   Step 3：计算结果
   ================================================================ */

.calc-result-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  border-radius: var(--calc-radius-lg);
  margin-bottom: 20px;
  transition: background-color 0.3s var(--calc-ease), border-color 0.3s var(--calc-ease);
  border: 1px solid;
}

.calc-result-status-bar.state-waiting {
  background: var(--calc-bg-subtle);
  border-color: var(--calc-border);
}

.calc-result-status-bar.state-captured {
  background: var(--calc-accent-soft);
  border-color: rgba(var(--calc-accent-rgb), 0.25);
}

.calc-result-status-bar.state-calculating {
  background: var(--calc-amber-soft);
  border-color: rgba(var(--calc-amber-rgb), 0.25);
}

.calc-result-status-bar.state-completed {
  background: var(--calc-success-soft);
  border-color: rgba(var(--calc-success-rgb), 0.25);
}

.calc-result-status-bar.state-error {
  background: var(--calc-error-soft);
  border-color: rgba(var(--calc-error-rgb), 0.25);
}

.calc-result-status-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.calc-result-status-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.state-waiting .calc-result-status-icon {
  background: rgba(var(--calc-text-muted), 0.12);
  color: var(--calc-text-muted);
}

.state-captured .calc-result-status-icon {
  background: var(--calc-accent);
  color: var(--calc-text-on-primary);
}

.state-calculating .calc-result-status-icon {
  background: var(--calc-amber);
  color: var(--calc-text-on-primary);
}

.state-completed .calc-result-status-icon {
  background: var(--calc-success);
  color: var(--calc-text-on-primary);
}

.state-error .calc-result-status-icon {
  background: var(--calc-error);
  color: var(--calc-text-on-primary);
}

.calc-result-status-icon svg {
  width: 18px;
  height: 18px;
}

.state-calculating .calc-result-status-icon svg {
  animation: spin 1.4s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.calc-result-status-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.calc-result-status-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--calc-text);
}

.calc-result-status-desc {
  font-size: 0.82rem;
  color: var(--calc-text-secondary);
}

.calc-result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.calc-result-section {
  background: var(--calc-bg-surface);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius-lg);
  overflow: hidden;
}

.calc-result-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: var(--calc-bg-subtle);
  border-bottom: 1px solid var(--calc-border);
}

.calc-result-section-title {
  font-family: var(--calc-font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--calc-text-secondary);
}

.calc-result-section-body {
  padding: 16px 18px;
  max-height: 280px;
  overflow-y: auto;
}

.calc-result-section-body::-webkit-scrollbar {
  width: 6px;
}

.calc-result-section-body::-webkit-scrollbar-thumb {
  background: var(--calc-border-strong);
  border-radius: 3px;
}

.calc-result-payload {
  font-family: var(--calc-font-mono);
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--calc-text-secondary);
  white-space: pre-wrap;
  word-break: break-all;
  font-variant-numeric: tabular-nums;
}

.calc-result-log {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.calc-result-log-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--calc-radius-md);
  background: var(--calc-bg-subtle);
  border: 1px solid var(--calc-border);
  font-size: 0.82rem;
  color: var(--calc-text-secondary);
  line-height: 1.55;
  animation: logIn 0.3s var(--calc-ease) both;
  animation-delay: calc(var(--log-index, 0) * 80ms);
}

.calc-result-log-item.placeholder {
  opacity: 0.5;
}

.calc-result-log-num {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--calc-accent-soft);
  color: var(--calc-accent);
  font-family: var(--calc-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

@keyframes logIn {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Cost summary：大数字 + tabular-nums + count-up */
.calc-cost-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.calc-cost-item {
  position: relative;
  padding: 18px;
  border-radius: var(--calc-radius-lg);
  background: var(--calc-bg-surface);
  border: 1px solid var(--calc-border);
  text-align: left;
  animation: itemSlideIn 0.3s var(--calc-ease) both;
  animation-delay: calc(var(--item-index, 0) * 50ms);
  transition: transform 0.25s var(--calc-ease), border-color 0.25s var(--calc-ease), box-shadow 0.25s var(--calc-ease);
  overflow: hidden;
}

.calc-cost-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--calc-accent);
  opacity: 0;
  transition: opacity 0.25s var(--calc-ease);
}

.calc-cost-item:hover {
  transform: translateY(-2px);
  border-color: var(--calc-border-strong);
  box-shadow: var(--calc-shadow-md);
}

.calc-cost-item:hover::before {
  opacity: 1;
}

.calc-cost-item.is-total {
  background: linear-gradient(135deg, rgba(var(--calc-amber-rgb), 0.08), rgba(var(--calc-amber-rgb), 0.02));
  border-color: rgba(var(--calc-amber-rgb), 0.3);
}

.calc-cost-item.is-total::before {
  background: var(--calc-amber);
  opacity: 1;
}

.calc-cost-label {
  font-size: 0.74rem;
  color: var(--calc-text-muted);
  margin-bottom: 8px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.calc-cost-value {
  font-family: var(--calc-font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--calc-text);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.calc-cost-item.is-total .calc-cost-value {
  color: var(--calc-amber);
  font-size: 1.6rem;
}

.calc-cost-unit {
  font-size: 0.72rem;
  color: var(--calc-text-muted);
  margin-top: 4px;
  font-weight: 400;
}

/* Empty waiting state */
.calc-result-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
}

.calc-result-empty-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--calc-bg-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--calc-text-placeholder);
}

.calc-result-empty-icon svg {
  width: 32px;
  height: 32px;
}

.calc-result-empty-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--calc-text);
  margin-bottom: 6px;
}

.calc-result-empty-desc {
  font-size: 0.86rem;
  color: var(--calc-text-muted);
  max-width: 380px;
  line-height: 1.6;
}

/* ================================================================
   Action bar
   ================================================================ */

.calc-action-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 32px;
  border-top: 1px solid var(--calc-border);
  background: var(--calc-bg-surface);
  flex-shrink: 0;
}

.calc-action-spacer {
  flex: 1;
}

.calc-action-bar .calc-btn {
  min-width: 130px;
}

/* ================================================================
   右栏：实时状态栏
   ================================================================ */

.calc-aside {
  position: sticky;
  top: 92px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-self: flex-start;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  padding-right: 4px;
}

.calc-aside::-webkit-scrollbar {
  width: 4px;
}

.calc-aside::-webkit-scrollbar-thumb {
  background: var(--calc-border-strong);
  border-radius: 2px;
}

.calc-aside-card {
  background: var(--calc-bg-glass-strong);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius-xl);
  padding: 18px;
  box-shadow: var(--calc-shadow-sm);
}

.calc-aside-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.calc-aside-card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--calc-font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--calc-text-secondary);
}

.calc-aside-card-title svg {
  width: 14px;
  height: 14px;
  color: var(--calc-accent);
}

.calc-aside-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: var(--calc-radius-full);
  font-size: 0.7rem;
  font-weight: 600;
}

.calc-aside-status .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  animation: dotPulse 2s ease-in-out infinite;
}

.calc-aside-status.is-idle {
  background: var(--calc-bg-subtle);
  color: var(--calc-text-muted);
}

.calc-aside-status.is-active {
  background: var(--calc-accent-soft);
  color: var(--calc-accent);
}

.calc-aside-status.is-success {
  background: var(--calc-success-soft);
  color: var(--calc-success);
}

@keyframes dotPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Selected model preview in aside */
.calc-aside-model {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.calc-aside-model-empty {
  padding: 24px 12px;
  text-align: center;
  color: var(--calc-text-muted);
  font-size: 0.84rem;
  border: 1px dashed var(--calc-border);
  border-radius: var(--calc-radius-md);
  background: var(--calc-bg-surface);
}

.calc-aside-model-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.calc-aside-model-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--calc-bg-subtle);
  border: 1px solid var(--calc-border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}

.calc-aside-model-icon-img {
  width: 26px;
  height: 26px;
  object-fit: contain;
}

.calc-aside-model-icon-text {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--calc-text);
}

.calc-aside-model-info {
  flex: 1;
  min-width: 0;
}

.calc-aside-model-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--calc-text);
  margin-bottom: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-aside-model-id {
  font-family: var(--calc-font-mono);
  font-size: 0.72rem;
  color: var(--calc-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-aside-model-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.calc-aside-tag {
  padding: 3px 8px;
  border-radius: var(--calc-radius-sm);
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--calc-bg-subtle);
  color: var(--calc-text-secondary);
  border: 1px solid var(--calc-border);
}

.calc-aside-tag.is-primary {
  background: var(--calc-accent-soft);
  color: var(--calc-accent);
  border-color: rgba(var(--calc-accent-rgb), 0.2);
}

.calc-aside-tag.is-amber {
  background: var(--calc-amber-soft);
  color: var(--calc-amber);
  border-color: rgba(var(--calc-amber-rgb), 0.2);
}

.calc-aside-tag.is-success {
  background: var(--calc-success-soft);
  color: var(--calc-success);
  border-color: rgba(var(--calc-success-rgb), 0.2);
}

.calc-aside-model-prices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--calc-border-subtle);
}

.calc-aside-price-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.calc-aside-price-label {
  font-size: 0.68rem;
  color: var(--calc-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.calc-aside-price-value {
  font-family: var(--calc-font-mono);
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--calc-text);
  font-variant-numeric: tabular-nums;
}

/* Session info */
.calc-aside-session-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--calc-border-subtle);
  font-size: 0.84rem;
}

.calc-aside-session-row:last-child {
  border-bottom: none;
}

.calc-aside-session-label {
  color: var(--calc-text-muted);
}

.calc-aside-session-value {
  font-family: var(--calc-font-mono);
  color: var(--calc-text);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  max-width: 60%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-aside-session-value.is-success {
  color: var(--calc-success);
}

.calc-aside-session-value.is-amber {
  color: var(--calc-amber);
}

/* Tips card */
.calc-aside-tips {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.calc-aside-tip {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--calc-text-secondary);
  line-height: 1.55;
}

.calc-aside-tip-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--calc-accent-soft);
  color: var(--calc-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--calc-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
}

/* ================================================================
   Buttons
   ================================================================ */

.calc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 42px;
  padding: 0 18px;
  border-radius: var(--calc-radius-md);
  border: 1px solid transparent;
  font-family: var(--calc-font-body);
  font-size: 0.9rem;
  font-weight: 600;
  transition: background-color 0.2s var(--calc-ease),
              border-color 0.2s var(--calc-ease),
              box-shadow 0.2s var(--calc-ease),
              transform 0.15s var(--calc-ease),
              color 0.2s var(--calc-ease);
}

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

.calc-btn-primary {
  background: var(--calc-accent);
  color: var(--calc-text-on-primary);
  border-color: var(--calc-accent);
  box-shadow: 0 4px 12px rgba(var(--calc-accent-rgb), 0.25);
}

.calc-btn-primary:hover:not(:disabled) {
  background: var(--calc-accent-hover);
  border-color: var(--calc-accent-hover);
  box-shadow: 0 6px 18px rgba(var(--calc-accent-rgb), 0.35);
}

.calc-btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

.calc-btn-secondary {
  background: var(--calc-bg-surface);
  color: var(--calc-text);
  border-color: var(--calc-border);
}

.calc-btn-secondary:hover {
  background: var(--calc-bg-subtle);
  border-color: var(--calc-border-strong);
}

.calc-btn-danger {
  background: var(--calc-error-soft);
  color: var(--calc-error);
  border-color: rgba(var(--calc-error-rgb), 0.25);
}

.calc-btn-danger:hover {
  background: rgba(var(--calc-error-rgb), 0.18);
}

.calc-btn-amber {
  background: var(--calc-amber);
  color: var(--calc-text-on-primary);
  border-color: var(--calc-amber);
  box-shadow: 0 4px 12px rgba(var(--calc-amber-rgb), 0.25);
}

.calc-btn-amber:hover:not(:disabled) {
  background: #D97706;
  border-color: #D97706;
  box-shadow: 0 6px 18px rgba(var(--calc-amber-rgb), 0.35);
}

.calc-btn-sm {
  height: 32px;
  padding: 0 12px;
  font-size: 0.8rem;
}

.calc-btn svg {
  width: 14px;
  height: 14px;
}

.calc-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--calc-radius-sm);
  border: 1px solid var(--calc-border);
  background: var(--calc-bg-surface);
  color: var(--calc-text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
  transition: all 0.2s var(--calc-ease);
  flex-shrink: 0;
}

.calc-copy-btn:hover {
  border-color: var(--calc-accent);
  color: var(--calc-accent);
  background: var(--calc-accent-soft);
}

.calc-copy-btn.copied {
  border-color: var(--calc-success);
  color: var(--calc-success);
  background: var(--calc-success-soft);
}

.calc-copy-btn svg {
  width: 13px;
  height: 13px;
}

/* ================================================================
   代码示例区：IDE 风格
   ================================================================ */

.calc-code-section {
  margin-top: 32px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--calc-ease), transform 0.8s var(--calc-ease);
}

.calc-code-section.visible {
  opacity: 1;
  transform: translateY(0);
}

.calc-code-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

.calc-code-head-left {
  flex: 1;
  min-width: 0;
}

.calc-code-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--calc-font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--calc-accent);
  margin-bottom: 8px;
}

.calc-code-eyebrow::before {
  content: '';
  width: 16px;
  height: 1px;
  background: var(--calc-accent);
}

.calc-code-head h2 {
  font-family: var(--calc-font-display);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--calc-text);
  letter-spacing: -0.01em;
  margin-bottom: 6px;
  text-wrap: balance;
}

.calc-code-head p {
  color: var(--calc-text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
  text-wrap: pretty;
}

/* IDE 风格代码块 */
.calc-code-block {
  border-radius: var(--calc-radius-xl);
  background: var(--calc-bg-surface);
  border: 1px solid var(--calc-border);
  overflow: hidden;
  box-shadow: var(--calc-shadow-md);
}

.calc-code-tabs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 8px 0;
  background: var(--calc-bg-subtle);
  border-bottom: 1px solid var(--calc-border);
}

.calc-code-tabs-left {
  display: flex;
  gap: 2px;
  padding-left: 8px;
}

.calc-code-tab {
  padding: 8px 14px;
  border-radius: var(--calc-radius-sm) var(--calc-radius-sm) 0 0;
  font-family: var(--calc-font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--calc-text-muted);
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  cursor: pointer;
  transition: all 0.2s var(--calc-ease);
  position: relative;
  top: 1px;
}

.calc-code-tab:hover {
  color: var(--calc-text);
  background: rgba(var(--calc-accent-rgb), 0.05);
}

.calc-code-tab.active {
  background: var(--calc-bg-surface);
  color: var(--calc-accent);
  border-color: var(--calc-border);
  border-bottom-color: var(--calc-bg-surface);
}

.calc-code-tab-actions {
  display: flex;
  gap: 6px;
  padding-right: 8px;
}

.calc-code-body {
  position: relative;
  display: flex;
  background: var(--calc-bg-surface);
}

.calc-code-gutter {
  flex-shrink: 0;
  padding: 18px 12px 18px 18px;
  background: var(--calc-bg-subtle);
  border-right: 1px solid var(--calc-border);
  font-family: var(--calc-font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--calc-text-placeholder);
  text-align: right;
  user-select: none;
  font-variant-numeric: tabular-nums;
}

.calc-code-gutter span {
  display: block;
}

.calc-code-content {
  flex: 1;
  overflow-x: auto;
  padding: 18px 22px;
}

.calc-code-content::-webkit-scrollbar {
  height: 6px;
}

.calc-code-content::-webkit-scrollbar-thumb {
  background: var(--calc-border-strong);
  border-radius: 3px;
}

.calc-code-content pre {
  font-family: var(--calc-font-mono);
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--calc-text);
  white-space: pre;
}

.calc-code-pane {
  display: none;
}

.calc-code-pane.active {
  display: block;
}

/* 简易语法着色 */
.calc-code-content .tk-key { color: #2563eb; font-weight: 600; }
.calc-code-content .tk-str { color: #059669; }
.calc-code-content .tk-com { color: var(--calc-text-muted); font-style: italic; }
.calc-code-content .tk-fn  { color: var(--calc-accent); font-weight: 600; }
.calc-code-content .tk-num { color: var(--calc-amber); }
.calc-code-content .tk-op  { color: var(--calc-text-secondary); }

/* ================================================================
   Tips 三栏
   ================================================================ */

.calc-tips {
  margin-top: 32px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--calc-ease), transform 0.8s var(--calc-ease);
}

.calc-tips.visible {
  opacity: 1;
  transform: translateY(0);
}

.calc-tips-head {
  margin-bottom: 18px;
}

.calc-tips-head h2 {
  font-family: var(--calc-font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--calc-text);
  margin-bottom: 4px;
}

.calc-tips-head p {
  font-size: 0.88rem;
  color: var(--calc-text-secondary);
}

.calc-tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.calc-tip-card {
  position: relative;
  padding: 22px;
  border-radius: var(--calc-radius-xl);
  background: var(--calc-bg-surface);
  border: 1px solid var(--calc-border);
  box-shadow: var(--calc-shadow-xs);
  transition: transform 0.3s var(--calc-ease), border-color 0.3s var(--calc-ease), box-shadow 0.3s var(--calc-ease);
  overflow: hidden;
}

.calc-tip-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--calc-accent), transparent);
  opacity: 0;
  transition: opacity 0.3s var(--calc-ease);
}

.calc-tip-card:hover {
  transform: translateY(-3px);
  border-color: rgba(var(--calc-accent-rgb), 0.25);
  box-shadow: var(--calc-shadow-lg);
}

.calc-tip-card:hover::before {
  opacity: 1;
}

.calc-tip-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--calc-radius-md);
  background: var(--calc-accent-soft);
  color: var(--calc-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.calc-tip-card-icon svg {
  width: 20px;
  height: 20px;
}

.calc-tip-card h3 {
  font-family: var(--calc-font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--calc-text);
  margin-bottom: 6px;
}

.calc-tip-card p {
  font-size: 0.84rem;
  color: var(--calc-text-secondary);
  line-height: 1.6;
}

/* ================================================================
   Footer
   ================================================================ */

.calc-footer {
  margin-top: 48px;
  padding: 24px 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--calc-text-muted);
  border-top: 1px solid var(--calc-border);
  background: var(--calc-bg-surface);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--calc-ease), transform 0.7s var(--calc-ease);
}

.calc-footer.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ================================================================
   Reveal animation
   ================================================================ */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--calc-ease), transform 0.7s var(--calc-ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ================================================================
   Confirm modal
   ================================================================ */

.calc-confirm {
  position: fixed;
  inset: 0;
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity .2s var(--calc-ease), visibility .2s var(--calc-ease);
}

.calc-confirm.open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.calc-confirm-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
}

.calc-confirm-modal {
  position: relative;
  z-index: 1;
  width: min(440px, 100%);
  padding: 28px;
  border-radius: var(--calc-radius-xl);
  background: var(--calc-bg-glass-strong);
  backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--calc-border);
  box-shadow: var(--calc-shadow-xl);
  animation: confirmIn 0.3s var(--calc-ease) both;
}

@keyframes confirmIn {
  from { opacity: 0; transform: translateY(12px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.calc-confirm-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--calc-error-soft);
  color: var(--calc-error);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.calc-confirm-icon svg {
  width: 22px;
  height: 22px;
}

.calc-confirm-title {
  font-family: var(--calc-font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--calc-text);
  margin-bottom: 10px;
}

.calc-confirm-message {
  font-size: 0.92rem;
  color: var(--calc-text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  white-space: pre-line;
}

.calc-confirm-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

.calc-confirm-actions .calc-btn {
  min-width: 96px;
}

/* ================================================================
   Responsive
   ================================================================ */

@media (max-width: 1180px) {
  .calc-workspace .calc-container {
    grid-template-columns: 220px minmax(0, 1fr);
  }

  .calc-aside {
    display: none;
  }
}

@media (max-width: 900px) {
  .calc-container {
    padding: 0 20px;
  }

  .calc-workspace .calc-container {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .calc-sidebar {
    position: static;
    max-height: none;
  }

  .calc-step-nav {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 6px;
  }

  .calc-step-nav::before {
    display: none;
  }

  .calc-step-link {
    min-width: 200px;
    flex-shrink: 0;
  }

  .calc-panel {
    min-height: 520px;
  }

  .calc-page-head .calc-container {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .calc-page-stats {
    flex-wrap: wrap;
  }

  .calc-page-stat {
    flex: 1;
    min-width: 120px;
    align-items: flex-start;
  }

  .calc-config-grid {
    grid-template-columns: 1fr;
  }

  .calc-flow-diagram {
    flex-wrap: wrap;
    gap: 6px;
  }

  .calc-flow-arrow {
    transform: rotate(90deg);
  }

  .calc-model-toolbar {
    flex-direction: column;
  }

  .calc-result-grid {
    grid-template-columns: 1fr;
  }

  .calc-tips-grid {
    grid-template-columns: 1fr;
  }

  .calc-code-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .calc-panel-inner {
    padding: 22px;
  }

  .calc-action-bar {
    padding: 14px 22px;
    flex-wrap: wrap;
  }

  .calc-action-bar .calc-btn {
    flex: 1;
    min-width: 120px;
  }
}

@media (max-width: 640px) {
  .calc-container {
    padding: 0 16px;
  }

  .calc-page-head {
    padding: 20px 0 18px;
  }

  .calc-key-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .calc-key-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .calc-key-create {
    flex-direction: column;
  }

  .calc-cost-summary {
    grid-template-columns: 1fr 1fr;
  }
}

/* ================================================================
   Reduced motion
   ================================================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal,
  .calc-page-head,
  .calc-workspace,
  .calc-code-section,
  .calc-tips,
  .calc-footer {
    opacity: 1;
    transform: none;
  }
}