/* ============================================================
   CARTOP · 二手车交易平台
   设计系统: Tesla (refero style) — 纯白 + 石墨灰 + Tesla Blue 唯一亮色
   ============================================================ */

:root {
  /* ── 颜色 (Tesla tokens) ── */
  --color-tesla-blue: #3e6ae1;
  --color-pure-white: #ffffff;
  --color-off-white: #eeeeee;
  --color-parchment: #e5e3df;
  --color-light-border: #cccccc;
  --color-subtle-gray: #8e8e8e;
  --color-steel: #5c5e62;
  --color-charcoal: #393c41;
  --color-onyx: #171a20;
  --color-carbon: #000000;

  /* ── 字体 ── */
  --font-display: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-text: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* ── 字号 ── */
  --text-caption: 11px;
  --text-body: 14px;
  --text-heading-sm: 20px;
  --text-heading: 28px;
  --text-heading-lg: 40px;
  --text-display: 48px;

  /* ── 间距 (4px 基础) ── */
  --sp-4: 4px;
  --sp-8: 8px;
  --sp-16: 16px;
  --sp-24: 24px;
  --sp-32: 32px;
  --sp-40: 40px;
  --sp-48: 48px;

  /* ── 圆角 ── */
  --radius-sm: 4px;
  --radius-lg: 8px;

  /* ── 阴影 ── */
  --shadow-sm: rgba(0, 0, 0, 0.25) 0px 4px 4px 0px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-text);
  font-size: var(--text-body);
  line-height: 1.43;
  color: var(--color-charcoal);
  background: var(--color-pure-white);
  -webkit-font-smoothing: antialiased;
}

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

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

button { font-family: inherit; cursor: pointer; }

h1, h2, h3 { font-weight: 500; color: var(--color-onyx); letter-spacing: -0.01em; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--sp-24); }

section { position: relative; }

/* ============ 按钮 (Tesla 规范) ============ */
.btn {
  display: inline-block;
  font-size: var(--text-body);
  font-weight: 500;
  border-radius: var(--radius-sm);
  padding: var(--sp-4) var(--sp-24);
  line-height: 2.2;
  text-align: center;
  transition: opacity 0.2s ease, background 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--color-tesla-blue);
  color: var(--color-pure-white);
  min-width: 220px;
}

.btn-primary:hover { opacity: 0.85; }

.btn-ghost {
  background: transparent;
  color: var(--color-onyx);
  border-color: var(--color-onyx);
  min-width: 220px;
}

.btn-ghost:hover { background: var(--color-onyx); color: var(--color-pure-white); }

.btn-white {
  background: var(--color-pure-white);
  color: var(--color-onyx);
  min-width: 220px;
}

.btn-white:hover { opacity: 0.85; }

.btn-blue-outline {
  background: transparent;
  color: var(--color-tesla-blue);
  border-color: var(--color-tesla-blue);
}

.btn-blue-outline:hover { background: var(--color-tesla-blue); color: #fff; }

.btn-sm { min-width: 0; padding: var(--sp-4) var(--sp-16); font-size: 13px; line-height: 2; }

.btn-block { width: 100%; }

/* ============ 导航栏 (细条, 非粘性 — Tesla 风格) ============ */
.site-header {
  position: relative;
  z-index: 50;
  background: var(--color-pure-white);
  border-bottom: 1px solid var(--color-off-white);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--sp-24);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-24);
}

.brand {
  font-size: 22px;
  font-weight: 500;
  color: var(--color-onyx);
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.brand-mark {
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 3px solid var(--color-tesla-blue);
  display: inline-block;
}

.nav-links { display: flex; align-items: center; gap: var(--sp-24); list-style: none; }

.nav-links a {
  font-size: var(--text-body);
  color: var(--color-charcoal);
  padding: var(--sp-8) 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nav-links a:hover, .nav-links a.active { color: var(--color-onyx); border-bottom-color: var(--color-tesla-blue); }

.nav-cta { display: flex; align-items: center; gap: var(--sp-16); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--color-onyx);
  line-height: 1;
}

/* ============ Hero 全屏 (Tesla 产品 hero) ============ */
.hero {
  min-height: calc(100vh - 56px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background-size: cover;
  background-position: center;
  position: relative;
  color: var(--color-pure-white);
}

.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.25) 0%, rgba(0,0,0,0.45) 100%);
}

.hero-content { position: relative; z-index: 2; padding: var(--sp-48) var(--sp-24); max-width: 900px; }

.hero h1 {
  font-size: clamp(32px, 6vw, var(--text-display));
  font-weight: 500;
  color: var(--color-pure-white);
  line-height: 1.17;
  margin-bottom: var(--sp-16);
}

.hero p {
  font-size: 18px;
  font-weight: 400;
  color: rgba(255,255,255,0.92);
  margin-bottom: var(--sp-32);
}

.hero-actions { display: flex; gap: var(--sp-16); justify-content: center; flex-wrap: wrap; }

/* Hero 搜索框 */
.hero-search {
  margin-top: var(--sp-32);
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: var(--radius-lg);
  padding: var(--sp-8);
  display: flex;
  gap: var(--sp-8);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.hero-search input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: #fff;
  font-size: 15px;
  padding: var(--sp-8) var(--sp-16);
}

.hero-search input::placeholder { color: rgba(255,255,255,0.7); }

.hero-search .btn { min-width: 0; }

/* ============ 通用区块标题 ============ */
.section { padding: var(--sp-64, 64px) 0; }

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--sp-40);
}

.section-head h2 { font-size: var(--text-heading-lg); margin-bottom: var(--sp-8); }

.section-head p { color: var(--color-steel); font-size: 15px; }

/* ============ 信任条 ============ */
.trust-bar {
  background: var(--color-pure-white);
  border-bottom: 1px solid var(--color-off-white);
  padding: var(--sp-24) 0;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-24);
  text-align: center;
}

.trust-item h3 { font-size: var(--text-heading-sm); margin-bottom: var(--sp-4); }

.trust-item p { font-size: 13px; color: var(--color-steel); }

/* ============ 车辆卡片网格 ============ */
.car-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--sp-24);
}

.car-card {
  background: var(--color-pure-white);
  border: 1px solid var(--color-off-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
  position: relative;
}

.car-card:hover {
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.car-card-img {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-off-white);
}

.car-card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.car-card:hover .car-card-img img { transform: scale(1.04); }

.car-tag {
  position: absolute;
  top: 12px; left: 12px;
  background: var(--color-onyx);
  color: var(--color-pure-white);
  font-size: var(--text-caption);
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.03em;
}

.car-fav {
  position: absolute;
  top: 10px; right: 10px;
  width: 34px; height: 34px;
  border-radius: 50%;
  background: rgba(255,255,255,0.92);
  border: none;
  font-size: 16px;
  color: var(--color-steel);
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.15s ease, color 0.15s ease;
}

.car-fav:hover { transform: scale(1.12); }
.car-fav.active { color: #e0245e; }

.car-card-body { padding: var(--sp-16) var(--sp-16) var(--sp-24); }

.car-name { font-size: 17px; font-weight: 500; color: var(--color-onyx); margin-bottom: 2px; }

.car-spec {
  font-size: 13px;
  color: var(--color-steel);
  margin-bottom: var(--sp-12);
}

.car-price {
  font-size: 22px;
  font-weight: 500;
  color: var(--color-onyx);
}

.car-price small { font-size: 13px; color: var(--color-steel); font-weight: 400; }

.car-meta {
  display: flex;
  gap: var(--sp-16);
  font-size: 12px;
  color: var(--color-steel);
  margin-top: var(--sp-8);
  border-top: 1px solid var(--color-off-white);
  padding-top: var(--sp-12);
}

/* ============ 筛选栏 ============ */
.filters {
  background: var(--color-pure-white);
  border: 1px solid var(--color-off-white);
  border-radius: var(--radius-lg);
  padding: var(--sp-16);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr auto;
  gap: var(--sp-8);
  margin-bottom: var(--sp-32);
  align-items: center;
}

.filters select, .filters input {
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 14px;
  color: var(--color-charcoal);
  background: var(--color-pure-white);
  outline: none;
  width: 100%;
}

.filters select:focus, .filters input:focus { border-color: var(--color-tesla-blue); }

/* ============ 全屏 CTA 区块 ============ */
.cta-full {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background-size: cover;
  background-position: center;
  position: relative;
  color: var(--color-pure-white);
}

.cta-full .cta-content { position: relative; z-index: 2; max-width: 720px; padding: var(--sp-48) var(--sp-24); }

.cta-full h2 {
  font-size: var(--text-heading-lg);
  color: var(--color-pure-white);
  margin-bottom: var(--sp-16);
}

.cta-full p { font-size: 17px; color: rgba(255,255,255,0.92); margin-bottom: var(--sp-32); }

/* ============ 服务卡片 ============ */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-24);
}

.service-card {
  background: var(--color-off-white);
  border-radius: var(--radius-lg);
  padding: var(--sp-32);
}

.service-card .icon { font-size: 28px; margin-bottom: var(--sp-16); }

.service-card h3 { font-size: var(--text-heading-sm); margin-bottom: var(--sp-8); }

.service-card p { font-size: 14px; color: var(--color-steel); }

/* ============ 表单 ============ */
.form-card {
  max-width: 560px;
  margin: 0 auto;
  background: var(--color-off-white);
  border-radius: var(--radius-lg);
  padding: var(--sp-32);
}

.form-group { margin-bottom: var(--sp-16); }

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--color-charcoal);
  margin-bottom: var(--sp-8);
  font-weight: 500;
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-size: 14px;
  font-family: inherit;
  color: var(--color-charcoal);
  background: var(--color-pure-white);
  outline: none;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--color-tesla-blue);
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-16); }

/* 成功提示 */
.form-success {
  display: none;
  text-align: center;
  padding: var(--sp-40) var(--sp-16);
}

.form-success .tick {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--color-tesla-blue);
  color: #fff;
  font-size: 26px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto var(--sp-16);
}

.form-success h3 { font-size: var(--text-heading); margin-bottom: var(--sp-8); }

.form-success p { color: var(--color-steel); }

/* ============ 模态框 (车辆详情) ============ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 100;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
  overflow-y: auto;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.modal-overlay.open { display: flex; opacity: 1; }

.modal {
  background: var(--color-pure-white);
  border-radius: var(--radius-lg);
  max-width: 860px;
  width: 100%;
  overflow: hidden;
  transform: translateY(16px);
  transition: transform 0.25s ease;
}

.modal-overlay.open .modal { transform: translateY(0); }

.modal-hero { position: relative; }

.modal-hero img { width: 100%; max-height: 420px; object-fit: cover; }

.modal-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 40px; height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.92);
  font-size: 18px;
  color: var(--color-onyx);
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.15s;
}

.modal-close:hover { transform: scale(1.1); }

.modal-body { padding: var(--sp-32); }

.modal-title-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--sp-16);
  flex-wrap: wrap;
  margin-bottom: var(--sp-8);
}

.modal-title-row h2 { font-size: var(--text-heading); }

.modal-title-row .price { font-size: 28px; font-weight: 500; color: var(--color-onyx); }

.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--sp-24) 0;
}

.spec-table td {
  padding: 10px 12px;
  border: 1px solid var(--color-off-white);
  font-size: 14px;
}

.spec-table td:first-child { color: var(--color-steel); width: 40%; background: #fafafa; }

.spec-table td:last-child { color: var(--color-onyx); font-weight: 500; }

.report-box {
  background: var(--color-off-white);
  border-radius: var(--radius-lg);
  padding: var(--sp-16) var(--sp-24);
  margin-bottom: var(--sp-24);
}

.report-box h4 { font-size: 15px; margin-bottom: var(--sp-8); color: var(--color-onyx); }

.report-box ul { list-style: none; }

.report-box li {
  font-size: 13px;
  color: var(--color-charcoal);
  padding: 4px 0;
  padding-left: 20px;
  position: relative;
}

.report-box li::before {
  content: "✓";
  position: absolute; left: 0;
  color: #2e7d32;
  font-weight: 700;
}

.modal-actions { display: flex; gap: var(--sp-16); margin-top: var(--sp-8); }

/* ============ 页脚 ============ */
.site-footer {
  background: var(--color-carbon);
  color: var(--color-steel);
  padding: var(--sp-48) 0 var(--sp-24);
  font-size: 13px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--sp-32);
  margin-bottom: var(--sp-32);
}

.footer-grid h4 { color: var(--color-pure-white); font-size: 14px; margin-bottom: var(--sp-16); font-weight: 500; }

.footer-grid a { display: block; padding: 4px 0; color: var(--color-steel); transition: color 0.2s; }

.footer-grid a:hover { color: var(--color-pure-white); }

.footer-bottom {
  border-top: 1px solid #2a2a2a;
  padding-top: var(--sp-24);
  display: flex;
  justify-content: space-between;
  gap: var(--sp-16);
  flex-wrap: wrap;
  font-size: 12px;
}

/* ============ 视图切换 ============ */
.view { display: none; }
.view.active { display: block; }

/* ============ 空状态 ============ */
.empty-state {
  text-align: center;
  padding: var(--sp-64) var(--sp-24);
  color: var(--color-steel);
}

.empty-state .big { font-size: 40px; margin-bottom: var(--sp-16); }

/* ============ 结果计数 ============ */
.result-count { color: var(--color-steel); font-size: 13px; margin-bottom: var(--sp-16); }

.result-count b { color: var(--color-onyx); }

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .trust-grid { grid-template-columns: repeat(2, 1fr); }
  .service-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .filters { grid-template-columns: 1fr 1fr; }
  .nav-links {
    display: none;
    position: absolute;
    top: 56px; left: 0; right: 0;
    background: var(--color-pure-white);
    flex-direction: column;
    padding: var(--sp-16) var(--sp-24) var(--sp-24);
    border-bottom: 1px solid var(--color-off-white);
    gap: var(--sp-16);
    align-items: flex-start;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .nav-cta .btn { display: none; }
  .hero-search { flex-direction: column; }
  .hero-search .btn { width: 100%; }
}

@media (max-width: 560px) {
  .form-row { grid-template-columns: 1fr; }
  .modal-actions { flex-direction: column; }
  .modal-actions .btn { width: 100%; }
  .hero h1 { font-size: 32px; }
}

/* ============================================================
   CARTOP v2 · 新增组件（详情页画廊 / 卖家中心 / 上传 / Toast）
   ============================================================ */

/* ---------- 画廊 (多图) ---------- */
.gallery { margin-bottom: var(--sp-32); }
.gallery-main {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-off-white);
}
.gallery-main img { width: 100%; height: 100%; object-fit: cover; }
.gallery-arrow {
  position: absolute;
  top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.9);
  color: var(--color-onyx);
  font-size: 24px;
  line-height: 1;
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.15s;
}
.gallery-arrow:hover { transform: translateY(-50%) scale(1.1); }
.gallery-prev { left: 16px; }
.gallery-next { right: 16px; }
.gallery-thumbs {
  display: flex; gap: var(--sp-8);
  margin-top: var(--sp-8);
  overflow-x: auto;
  padding-bottom: 4px;
}
.gallery-thumbs img {
  width: 96px; height: 64px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  cursor: pointer;
  opacity: 0.55;
  border: 2px solid transparent;
  flex-shrink: 0;
  transition: opacity 0.2s, border-color 0.2s;
}
.gallery-thumbs img.active { opacity: 1; border-color: var(--color-tesla-blue); }

/* ---------- 详情页头部 ---------- */
.detail-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--sp-24);
  flex-wrap: wrap;
  margin-bottom: var(--sp-24);
}
.detail-title { font-size: var(--text-heading-lg); line-height: 1.2; margin: var(--sp-8) 0 var(--sp-8); }
.detail-sub { color: var(--color-steel); font-size: 15px; }
.detail-price { font-size: 34px; font-weight: 500; color: var(--color-onyx); white-space: nowrap; }
.detail-price small { font-size: 14px; color: var(--color-steel); font-weight: 400; }
.tag-chip {
  display: inline-block;
  background: var(--color-off-white);
  color: var(--color-charcoal);
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  margin-right: var(--sp-8);
}
.tag-chip-blue { background: rgba(62,106,225,0.12); color: var(--color-tesla-blue); }

/* ---------- 核心卖点卡片 ---------- */
.spec-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-16);
  margin-bottom: var(--sp-32);
}
.spec-card {
  background: var(--color-off-white);
  border-radius: var(--radius-lg);
  padding: var(--sp-16);
  text-align: center;
}
.spec-card .v { font-size: 18px; font-weight: 500; color: var(--color-onyx); }
.spec-card .k { font-size: 12px; color: var(--color-steel); margin-top: 4px; }

/* ---------- 详情页双栏 ---------- */
.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-32);
  margin-bottom: var(--sp-40);
}
.detail-h3 { font-size: var(--text-heading-sm); margin-bottom: var(--sp-16); }
.detail-desc { color: var(--color-charcoal); line-height: 1.8; }

/* ---------- 买家询价框 ---------- */
.inquiry-box {
  background: var(--color-off-white);
  border-radius: var(--radius-lg);
  padding: var(--sp-32);
  display: flex;
  gap: var(--sp-32);
  align-items: center;
  flex-wrap: wrap;
}
.inquiry-info { flex: 1; min-width: 220px; }
.inquiry-info h3 { font-size: var(--text-heading); margin-bottom: var(--sp-8); }
.inquiry-info p { color: var(--color-steel); font-size: 14px; }
.inquiry-form {
  flex: 2;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: var(--sp-8);
  min-width: 320px;
}
.inquiry-form input {
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
  background: var(--color-pure-white);
}
.inquiry-form input:focus { border-color: var(--color-tesla-blue); }
.inquiry-form .btn { min-width: 0; white-space: nowrap; }

/* ---------- 卖家中心 ---------- */
.auth-tabs {
  display: flex;
  gap: var(--sp-8);
  justify-content: center;
  margin-bottom: var(--sp-24);
}
.auth-tab {
  background: transparent;
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-sm);
  padding: 10px 32px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-charcoal);
  transition: all 0.2s;
}
.auth-tab.active {
  background: var(--color-tesla-blue);
  border-color: var(--color-tesla-blue);
  color: var(--color-pure-white);
}
.seller-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-off-white);
  border-radius: var(--radius-lg);
  padding: var(--sp-16) var(--sp-24);
  max-width: 760px;
  margin: 0 auto;
}

/* ---------- 图片上传 ---------- */
.upload-zone {
  border: 2px dashed var(--color-light-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-24);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-8);
  transition: border-color 0.2s;
}
.upload-zone:hover { border-color: var(--color-tesla-blue); }
.upload-preview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: var(--sp-8);
  margin-top: var(--sp-16);
}
.upload-preview .thumb {
  position: relative;
  aspect-ratio: 4/3;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid var(--color-light-border);
}
.upload-preview .thumb.main { border-color: var(--color-tesla-blue); }
.upload-preview .thumb img { width: 100%; height: 100%; object-fit: cover; }
.upload-preview .thumb .rm {
  position: absolute;
  top: 4px; right: 4px;
  width: 22px; height: 22px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.65);
  color: #fff;
  font-size: 12px;
  line-height: 1;
  display: flex; align-items: center; justify-content: center;
}
.upload-preview .thumb .main-badge {
  position: absolute;
  bottom: 4px; left: 4px;
  background: var(--color-tesla-blue);
  color: #fff;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
}

/* ---------- Toast 轻提示 ---------- */
.toast {
  position: fixed;
  bottom: 32px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--color-onyx);
  color: var(--color-pure-white);
  padding: 12px 24px;
  border-radius: var(--radius-lg);
  font-size: 14px;
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
  max-width: 90vw;
  text-align: center;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 响应式补充 ---------- */
@media (max-width: 900px) {
  .spec-cards { grid-template-columns: repeat(2, 1fr); }
  .detail-grid { grid-template-columns: 1fr; }
  .inquiry-form { grid-template-columns: 1fr; }
  .gallery-main { aspect-ratio: 4/3; }
}
@media (max-width: 560px) {
  .detail-price { font-size: 26px; }
  .detail-title { font-size: 28px; }
}