/* ============================================
   Jingyu Energy - Clean Design System
   ============================================ */

:root {
  --blue: #0066FF;
  --blue-dark: #0052CC;
  --blue-light: #EBF3FF;

  --ink: #1A1A2E;
  --text: #374151;
  --muted: #6B7280;
  --border: #E5E7EB;
  --bg: #FFFFFF;
  --bg-alt: #F9FAFB;

  --navbar-h: 64px;
  --max-w: 1100px;
  --radius: 8px;
  --radius-lg: 12px;
}

/* === Reset === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--ink);
  background: #F0F2F5;
  line-height: 1.6;
  overflow-x: hidden;
  max-width: 1320px;
  margin: 0 auto;
  position: relative;
  box-shadow: 0 0 40px rgba(0,0,0,0.06);
}

a { text-decoration: none; color: inherit; transition: color 0.2s; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }

/* === Typography === */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.3; color: var(--ink); }
h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }
p { color: var(--text); line-height: 1.7; }

.text-muted { color: var(--muted); }

/* === Layout === */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--ink);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* === Navbar === */
.navbar {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 1320px;
  height: var(--navbar-h);
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}

.navbar.scrolled {
  box-shadow: 0 1px 8px rgba(0,0,0,0.06);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--blue);
}

.navbar-brand img {
  height: 32px;
  width: auto;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.navbar-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  position: relative;
  padding: 4px 0;
}

.navbar-nav a:hover,
.navbar-nav a.active {
  color: var(--blue);
}

.navbar-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--blue);
  border-radius: 1px;
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  padding: 4px;
}

.navbar-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 1px;
  transition: all 0.3s;
}

.navbar-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.navbar-toggle.open span:nth-child(2) { opacity: 0; }
.navbar-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  border: 1.5px solid transparent;
  line-height: 1.4;
}

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

.btn-primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
}

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

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

.btn-white {
  background: #fff;
  color: var(--blue);
  border-color: #fff;
}

.btn-white:hover {
  background: var(--bg-alt);
}

.btn-outline-white {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.5);
}

.btn-outline-white:hover {
  background: rgba(255,255,255,0.15);
}

.btn-sm {
  padding: 6px 16px;
  font-size: 0.85rem;
}

/* === Hero === */
.hero {
  min-height: 55vh;
  display: flex;
  align-items: center;
  background: linear-gradient(160deg, #F0F5FF 0%, #F7F8FA 100%);
  padding-top: var(--navbar-h);
  text-align: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  color: var(--ink);
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--muted);
  margin-bottom: 36px;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* === Stats Bar === */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  margin-top: -40px;
  position: relative;
  z-index: 2;
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--blue);
  line-height: 1.2;
  font-family: 'Inter', sans-serif;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 4px;
}

/* === Feature Cards === */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 32px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  border-color: var(--blue);
  box-shadow: 0 2px 12px rgba(0,102,255,0.08);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  background: var(--blue-light);
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-card h3 {
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

/* === Category Cards === */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.category-card {
  padding: 28px 16px;
  text-align: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg);
  transition: border-color 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.category-card:hover {
  border-color: var(--blue);
  box-shadow: 0 2px 12px rgba(0,102,255,0.08);
}

.category-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  background: var(--blue-light);
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.category-card h4 {
  margin-bottom: 6px;
}

.category-card p {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.5;
}

/* === Tools Grid === */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tool-card {
  padding: 36px 24px;
  text-align: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg);
  transition: border-color 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.tool-card:hover {
  border-color: var(--blue);
  box-shadow: 0 2px 12px rgba(0,102,255,0.08);
}

.tool-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  background: var(--blue-light);
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.tool-card h3 {
  margin-bottom: 8px;
}

.tool-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

/* === CTA Section === */
.cta-section {
  background: var(--blue);
  padding: 64px 0;
  text-align: center;
}

.cta-content h2 {
  color: #fff;
  font-size: 2rem;
  margin-bottom: 12px;
}

.cta-content p {
  color: rgba(255,255,255,0.85);
  font-size: 1.05rem;
  margin-bottom: 28px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

/* === Page Header (subpages) === */
.page-header {
  background: var(--bg-alt);
  padding: 120px 0 48px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-size: 2rem;
  margin-bottom: 8px;
}

.page-header p {
  font-size: 1rem;
  color: var(--muted);
}

.page-body {
  padding: 88px 24px 80px;
}

/* === Filter Bar === */
.filter-bar {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 32px;
  padding: 20px 24px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.filter-bar .filter-group {
  padding: 10px 0;
  border-bottom: 1px solid #eee;
}

.filter-bar .filter-group:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.filter-bar .filter-group:first-child {
  padding-top: 0;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.filter-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  min-width: 36px;
  flex-shrink: 0;
}

.filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.filter-btn {
  padding: 5px 14px;
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  transition: all 0.2s;
}

.filter-btn:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.filter-btn.active {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}

.filter-btn-disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}

.filter-reset-btn {
  padding: 5px 16px;
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid #e74c3c;
  background: transparent;
  color: #e74c3c;
  transition: all 0.2s;
}

.filter-reset-btn:hover {
  background: #e74c3c;
  color: #fff;
}

.filter-reset-group {
  padding-top: 10px !important;
  border-bottom: none !important;
}

/* === Products Grid === */
.products-grid {
  display: flex;
  flex-direction: column;
}

.products-count {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 16px;
}

.products-grid-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.product-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg);
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.product-card:hover {
  border-color: var(--blue);
  box-shadow: 0 2px 12px rgba(0,102,255,0.08);
}

.product-card-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-alt);
}

.product-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-card-header {
  padding: 20px 20px 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.product-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.product-card-header h4 {
  font-size: 1rem;
  margin-bottom: 2px;
}

.product-tag {
  font-size: 0.75rem;
  color: var(--blue);
  font-weight: 500;
}

.product-card-body {
  padding: 0 20px 20px;
}

.product-card-body p {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 12px;
  line-height: 1.6;
}

.product-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.spec-tag {
  padding: 3px 10px;
  background: var(--bg-alt);
  border-radius: 9999px;
  font-size: 0.78rem;
  color: var(--text);
}

/* === Calculator / Tool Pages === */
.back-link {
  display: inline-flex;
  align-items: center;
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 24px;
  padding: 4px 0;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--blue);
}

.calc-card {
  max-width: 1000px;
  margin: 0 auto;
}

/* 工具页容器放宽，充分利用页面宽度 */
#page-tools .container,
#page-quotation .container,
#page-pipe-insulation .container,
#page-insulation-thickness .container {
  max-width: 1200px;
}

.calc-card h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.calc-card > .text-muted {
  margin-bottom: 28px;
  font-size: 0.95rem;
}

.calc-form {
  margin-bottom: 24px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--bg);
  transition: border-color 0.2s;
}

.form-control:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(0,102,255,0.08);
}

.form-control::placeholder {
  color: #9CA3AF;
}

.form-actions {
  margin-top: 24px;
}

/* === Result Panel === */
.result-panel {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.result-panel h3 {
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

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

.result-item .label {
  font-size: 0.9rem;
  color: var(--muted);
}

.result-item .value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.result-item .value.primary {
  color: var(--blue);
}

/* === Quotation Tool === */
.qt-section {
  margin-bottom: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}
.qt-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}
.qt-section h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 16px;
}

.qt-filter-bar {
  margin-bottom: 0;
}
.qt-filter-bar .filter-group {
  padding: 10px 0;
  border-bottom: 1px solid #eee;
}
.qt-filter-bar .filter-group:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.qt-filter-bar .filter-group:first-child {
  padding-top: 0;
}

.qt-params-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.qt-param-item {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.qt-param-label {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 500;
}
.qt-param-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
}

.qt-p-input {
  font-size: 0.9rem !important;
  font-weight: 600;
  padding: 6px 8px !important;
  height: auto !important;
  border-color: transparent;
  background: transparent;
  transition: border-color 0.2s, background 0.2s;
}
.qt-p-input:hover {
  border-color: var(--border);
  background: var(--bg);
}
.qt-p-input:focus {
  border-color: var(--blue);
  background: var(--bg);
  box-shadow: 0 0 0 2px rgba(0,102,255,0.1);
}
/* 容重输入框带自定义下拉按钮，隐藏原生数字旋钮避免重叠 */
#pipe-density::-webkit-inner-spin-button,
#pipe-density::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
#pipe-density { -moz-appearance: textfield; appearance: textfield; }
/* 管道工具操作按钮行 */
.pipe-actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 20px; }

/* === 管道保温计算结果卡片 === */
.ins-result-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.ins-result-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.ins-result-card-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--blue);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.ins-result-rows {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.ins-result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.ins-diagram {
  display: block;
  width: 100%;
  max-width: 420px;
  margin: 0 auto 22px;
}
.ins-common-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.ins-card-inputs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 14px;
}

/* === 保温厚度设计计算器 === */
.it-tabs { display: flex; gap: 8px; background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 6px; margin: 20px 0 24px; }
.it-tab { flex: 1; border: none; background: transparent; padding: 10px 8px; font-size: 0.95rem; font-weight: 600; color: var(--muted); border-radius: 6px; cursor: pointer; transition: all 0.18s; }
.it-tab:hover { color: var(--blue); }
.it-tab.active { background: var(--blue); color: #fff; box-shadow: 0 4px 12px rgba(0,102,255,0.25); }
.it-layout { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 24px; align-items: start; }
@media (max-width: 880px) { .it-layout { grid-template-columns: 1fr; } }
.it-block { margin-bottom: 22px; }
.it-block-title { font-size: 1rem; font-weight: 600; color: var(--ink); margin-bottom: 14px; }
.it-grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 520px) { .it-grid2 { grid-template-columns: 1fr; } }
.it-method { display: none; }
.it-method.show { display: block; }
.it-select { width: 100%; font-size: 0.9rem; font-weight: 600; padding: 6px 8px; height: auto; border: 1px solid transparent; border-radius: 6px; background: transparent; color: var(--ink); transition: border-color 0.2s, background 0.2s; }
.it-select:hover { border-color: var(--border); background: var(--bg); }
.it-select:focus { border-color: var(--blue); background: var(--bg); box-shadow: 0 0 0 2px rgba(0,102,255,0.1); outline: none; }
.it-as-manual { margin-top: 14px; font-size: 0.85rem; color: var(--muted); }
.it-as-manual > label { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.it-as-field { margin-top: 10px; max-width: 240px; }
.it-chips { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.it-chip { border: 1px solid var(--border); background: #fff; color: var(--muted); border-radius: 20px; padding: 5px 14px; font-size: 0.8rem; cursor: pointer; transition: all 0.15s; }
.it-chip:hover { border-color: var(--blue); color: var(--blue); }
.it-calc-btn { width: 100%; margin-top: 4px; padding: 12px; font-size: 1rem; font-weight: 700; }
.it-results-card { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 20px; position: sticky; top: 80px; }
.it-results-card h4 { font-size: 1rem; font-weight: 600; color: var(--ink); margin-bottom: 14px; }
.it-empty { color: var(--muted); font-size: 0.9rem; text-align: center; padding: 44px 0; }
.it-hero { background: linear-gradient(135deg, var(--blue), var(--blue-dark)); color: #fff; border-radius: var(--radius); padding: 20px; text-align: center; margin-bottom: 14px; }
.it-hero-lbl { font-size: 0.8rem; opacity: 0.85; }
.it-hero-val { font-size: 2.6rem; font-weight: 800; line-height: 1.2; }
.it-hero-val small { font-size: 1.1rem; font-weight: 600; }
.it-hero-exact { font-size: 0.75rem; opacity: 0.8; margin-top: 4px; }
.it-rows { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: #fff; }
.it-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 9px 14px; font-size: 0.85rem; border-bottom: 1px solid var(--border); }
.it-row:last-child { border-bottom: none; }
.it-row-k { color: var(--muted); }
.it-row-v { font-weight: 600; color: var(--ink); text-align: right; font-variant-numeric: tabular-nums; }
.it-badge { display: inline-block; padding: 1px 9px; border-radius: 20px; font-size: 0.72rem; font-weight: 600; margin-left: 6px; }
.it-badge.ok { background: #E6F9F1; color: #00A878; }
.it-badge.warn { background: #FFF0F0; color: #E5484D; }
.it-warn { background: #FFF8F0; border: 1px solid #FFE0B2; border-radius: var(--radius); padding: 12px 14px; font-size: 0.82rem; color: #B45309; margin-top: 12px; line-height: 1.7; }
.it-actions { display: flex; gap: 10px; margin-top: 14px; }
.it-actions .btn { flex: 1; padding: 10px 16px; font-size: 0.9rem; font-weight: 600; }
.it-footnote { margin-top: 16px; font-size: 0.72rem; color: var(--muted); line-height: 1.7; }
@media (max-width: 560px) {
  .ins-result-cols { grid-template-columns: 1fr; }
  .ins-common-grid { grid-template-columns: 1fr; }
  .ins-card-inputs { grid-template-columns: 1fr; }
}

.qt-price-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.qt-price-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.qt-price-item label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink);
}
.qt-price-input-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}
.qt-price-input-wrap .form-control {
  flex: 1;
}
.qt-price-unit {
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
  min-width: 48px;
}

/* === Quantity Inputs === */
.qt-qty-input {
  font-weight: 600;
  text-align: right;
}
.qt-price-input {
  font-weight: 600;
  text-align: right;
}

/* === Toggle Row (含税) === */
.qt-freight-row {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.qt-freight-hint {
  font-size: 0.85rem;
  color: var(--orange, #d4880f);
  background: #fff8e6;
  border: 1px solid #ffe7ba;
  border-radius: 6px;
  padding: 8px 12px;
  margin-bottom: 16px;
}
.qt-freight-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.95rem;
  user-select: none;
}
.qt-freight-toggle input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--blue);
  cursor: pointer;
}

/* === Total Price Display === */
.qt-total-grid {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  padding: 20px 24px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
}
.qt-total-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.qt-total-label {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 500;
}
.qt-total-value {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
}
.qt-total-highlight {
  color: var(--blue);
}

/* === Freight Unit Prices === */
.qt-unit-prices {
  margin-top: 20px;
}
.qt-unit-prices h5 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
}
.qt-price-readonly {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  padding: 10px 14px;
  background: var(--blue-light);
  border-radius: var(--radius);
  text-align: right;
}

/* === Share Button & Modal === */
.qt-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.qt-share-btn {
  flex-shrink: 0;
  font-size: 0.85rem;
  padding: 6px 16px;
}
.qt-action-row {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding-top: 8px;
}
/* Quotation — matched product card */
.qt-pcard {
  display: flex;
  gap: 20px;
  text-decoration: none;
  color: inherit;
  background: linear-gradient(135deg, #f0f5ff 0%, #e8f0fe 100%);
  border: 1px solid #d0dff8;
  border-radius: 10px;
  padding: 16px 20px;
  transition: box-shadow 0.2s, transform 0.2s;
  cursor: pointer;
}
.qt-pcard:hover {
  box-shadow: 0 4px 16px rgba(0,102,255,0.15);
  transform: translateY(-2px);
}
.qt-pcard-img {
  flex-shrink: 0;
  width: 170px;
  height: 170px;
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
  align-self: center;
}
.qt-pcard-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 8px;
  border: 1px solid #d0dff8;
}
.qt-pcard-body {
  flex: 1;
  min-width: 0;
}
.qt-pcard-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
}
.qt-pcard-title {
  font-size: 1rem;
  font-weight: 600;
  color: #1a1a1a;
}
.qt-pcard-tag {
  display: inline-block;
  background: #0066FF;
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 20px;
  white-space: nowrap;
}
.qt-pcard-code {
  font-size: 0.8rem;
  color: #888;
  margin-bottom: 14px;
}
.qt-pcard-specs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
}
.qt-pcard-spec {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.qt-pcard-spec-label {
  font-size: 0.8rem;
  color: #666;
  white-space: nowrap;
}
.qt-pcard-spec-val {
  font-size: 0.8rem;
  font-weight: 600;
  color: #1a1a1a;
  white-space: nowrap;
}
.qt-pcard-more {
  margin-top: 12px;
  text-align: right;
  font-size: 0.8rem;
  color: #0066FF;
  font-weight: 500;
}
.qt-share-modal {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}
.qt-share-modal.active {
  display: flex;
}
.qt-share-content {
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  position: relative;
  box-shadow: 0 8px 32px rgba(0,0,0,0.15);
}
.qt-share-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.qt-share-header h3 {
  font-size: 1.1rem;
  margin: 0;
}
.qt-share-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--muted);
  line-height: 1;
  padding: 0 4px;
}
.qt-share-close:hover { color: var(--ink); }
.qt-share-qr {
  display: flex;
  justify-content: center;
  margin: 20px 0;
}
.qt-share-qr canvas, .qt-share-qr img {
  border-radius: var(--radius);
}
.qt-share-url-row {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}
.qt-share-url-row .form-control {
  flex: 1;
  font-size: 0.8rem;
}
.qt-share-tip {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--blue);
  min-height: 1.2em;
}

/* === Scenarios Grid === */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}

.scenario-card {
  padding: 20px 12px;
  text-align: center;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  cursor: pointer;
  transition: border-color 0.2s;
}

.scenario-card:hover {
  border-color: var(--blue);
}

.scenario-card.selected {
  border-color: var(--blue);
  background: var(--blue-light);
}

.scenario-card .icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.scenario-card h4 {
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.scenario-card p {
  font-size: 0.8rem;
  color: var(--muted);
}

/* === Recommendations === */
.recommendations { margin-top: 32px; }

.recommendation-card {
  display: flex;
  gap: 20px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg);
  margin-bottom: 16px;
  align-items: center;
  transition: border-color 0.2s;
}

.recommendation-card:hover {
  border-color: var(--blue);
}

.rec-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  background: var(--blue-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.rec-body { flex: 1; }

.rec-body h4 {
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.rec-body p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.5;
}

.rec-meta {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.meta-tag {
  padding: 2px 10px;
  background: var(--bg-alt);
  border-radius: 9999px;
  font-size: 0.78rem;
  color: var(--text);
  font-weight: 500;
}

.rec-action { flex-shrink: 0; }

/* === Footer === */
.footer {
  background: var(--ink);
  color: rgba(255,255,255,0.6);
  padding: 56px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand {
  text-align: center;
}

.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 12px;
}

.footer-logo img {
  height: 28px;
  width: auto;
  filter: brightness(10);
}

.footer-logo span {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}

.footer-brand p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.6;
}

.footer-col {
  text-align: center;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a,
.footer-col ul li {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.5);
  transition: color 0.2s;
}

.footer-col ul li a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.35);
}

/* === Page visibility (JS controlled) === */
.page { display: none; }
.page.active { display: block; }

/* === Animations === */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Utilities === */
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 40px auto;
}

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

.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--muted);
}

.empty-state .icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  opacity: 0.4;
}

.empty-state h4 {
  color: var(--text);
  margin-bottom: 6px;
}

/* === Product Detail Page === */
.product-detail-top {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.product-image {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--bg-alt);
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-image-wrap {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.product-applications {
  margin-top: 24px;
}

.product-applications h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
}

.app-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.app-tag {
  padding: 5px 14px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.82rem;
  color: var(--text);
  font-weight: 500;
}

.product-info h1 {
  font-size: 1.75rem;
  margin-bottom: 8px;
}

.product-code {
  font-size: 0.88rem;
  color: var(--muted);
  font-family: 'Inter', monospace;
  margin-bottom: 20px;
}

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.product-tag {
  padding: 4px 14px;
  background: var(--blue-light);
  color: var(--blue);
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 600;
}

.product-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.product-title-row .pd-share-btn {
  flex-shrink: 0;
  min-width: 120px;
}

.product-key-specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.key-spec {
  padding: 16px;
  background: var(--bg-alt);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.key-spec .key-spec-label {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.key-spec .key-spec-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink);
  font-family: 'Inter', sans-serif;
}

.key-spec .key-spec-unit {
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--muted);
}

/* Specs Section */
.product-specs-section {
  margin-bottom: 32px;
}

.product-specs-section h3 {
  font-size: 1.15rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--blue);
  display: inline-block;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.specs-table tr {
  border-bottom: 1px solid var(--border);
}

.specs-table tr:last-child {
  border-bottom: none;
}

.specs-table td {
  padding: 10px 16px;
  vertical-align: top;
}

.specs-table td:first-child {
  width: 220px;
  color: var(--muted);
  font-weight: 500;
  white-space: nowrap;
}

.specs-table td:last-child {
  color: var(--ink);
  font-weight: 600;
}

.specs-table tr.specs-category {
  background: var(--bg-alt);
}

.specs-table tr.specs-category td {
  font-weight: 700;
  color: var(--blue);
  font-size: 0.88rem;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}

.product-standard {
  margin-top: 32px;
  padding: 16px 20px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.6;
}

.product-standard strong {
  color: var(--text);
}

/* === Responsive === */
@media (max-width: 1024px) {
  .features-grid,
  .tools-grid,
  .products-grid-inner,
  .scenarios-grid { grid-template-columns: repeat(2, 1fr); }

  .categories-grid { grid-template-columns: repeat(2, 1fr); }

  .stats-bar { grid-template-columns: repeat(2, 1fr); }

  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }

  .hero-title { font-size: 2.75rem; }

  .product-detail-top { grid-template-columns: 320px 1fr; gap: 28px; }

  .qt-params-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  :root { --navbar-h: 56px; }

  .section { padding: 56px 0; }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  .section-title { font-size: 1.5rem; }

  .hero { min-height: 70vh; }
  .hero-title { font-size: 2.25rem; }
  .hero-subtitle { font-size: 1rem; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn { width: 100%; text-align: center; }

  .navbar-nav {
    display: none;
    position: absolute;
    top: var(--navbar-h);
    left: 0;
    right: 0;
    background: var(--bg);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  }

  .navbar-nav.show { display: flex; }
  .navbar-toggle { display: flex; }

  .features-grid,
  .tools-grid,
  .products-grid-inner,
  .scenarios-grid { grid-template-columns: 1fr; }

  .categories-grid { grid-template-columns: repeat(2, 1fr); }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    padding: 28px 20px;
    margin-top: -24px;
  }

  .stat-number { font-size: 1.75rem; }

  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

  .form-row { grid-template-columns: 1fr; }

  .page-header { padding: 100px 0 36px; }
  .page-body { padding: 32px 16px 56px; }

  .recommendation-card { flex-direction: column; text-align: center; }
  .rec-meta { justify-content: center; }

  .cta-section { padding: 48px 0; }
  .cta-content h2 { font-size: 1.5rem; }

  .product-detail-top { grid-template-columns: 1fr; }
  .product-image { max-width: 400px; }
  .product-key-specs { grid-template-columns: 1fr; }
  .specs-table td:first-child { width: 140px; }

  .qt-params-grid { grid-template-columns: repeat(2, 1fr); }
  .qt-price-grid { grid-template-columns: 1fr; }

  .qt-pcard {
    flex-direction: column;
    gap: 0;
    padding: 0;
  }
  .qt-pcard-img {
    width: 100%;
    height: 160px;
    border-radius: 10px 10px 0 0;
    background: linear-gradient(135deg, #f0f5ff 0%, #e8f0fe 100%);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .qt-pcard-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 8px;
    box-sizing: border-box;
    border-radius: 8px;
    border: 1px solid #d0dff8;
  }
  .qt-pcard-body {
    min-width: 0;
    width: 100%;
    padding: 16px;
  }
  .qt-pcard-header {
    flex-wrap: wrap;
  }
  .qt-pcard-title {
    font-size: 0.9rem;
  }
}

/* === Stats Dashboard === */
/* Stats auth gate */
.stats-auth {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 300px;
}

.stats-auth-box {
  text-align: center;
  padding: 40px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  max-width: 360px;
  width: 100%;
}

.stats-auth-box h3 {
  font-size: 1.1rem;
  margin-bottom: 20px;
  color: var(--ink);
}

.stats-auth-input {
  display: flex;
  gap: 8px;
}

.stats-auth-input input {
  flex: 1;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  outline: none;
}

.stats-auth-input input:focus {
  border-color: var(--blue);
}

.stats-auth-err {
  margin-top: 12px;
  font-size: 0.82rem;
  color: #e74c3c;
  min-height: 1.2em;
}

.stats-change-pwd-btn {
  margin-left: auto;
}

.stats-pwd-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.stats-pwd-box {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 380px;
  width: 90%;
}

.stats-pwd-box h4 {
  font-size: 1.05rem;
  margin-bottom: 20px;
  color: var(--ink);
}

.stats-pwd-field {
  margin-bottom: 14px;
}

.stats-pwd-field label {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 6px;
}

.stats-pwd-field input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  outline: none;
  box-sizing: border-box;
}

.stats-pwd-field input:focus {
  border-color: var(--blue);
}

.stats-pwd-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

.stats-range {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}

.stats-range-btn {
  padding: 6px 18px;
  border-radius: 9999px;
  font-size: 0.85rem;
  cursor: pointer;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  transition: all 0.2s;
}

.stats-range-btn.active {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}

.stats-overview {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.stats-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  text-align: center;
}

.stats-card-label {
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 8px;
}

.stats-card-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--blue);
}

.stats-section {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 24px;
}

.stats-section-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--ink);
}

.stats-chart-wrap {
  overflow-x: auto;
}

.stats-chart-wrap canvas {
  display: block;
  width: 100%;
  max-width: 800px;
  height: auto;
}

.stats-grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

/* Page rank list */
.stats-rank-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stats-rank-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.stats-rank-info {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 120px;
}

.stats-rank-idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #f0f4ff;
  color: var(--blue);
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.stats-rank-item:nth-child(1) .stats-rank-idx {
  background: var(--blue);
  color: #fff;
}

.stats-rank-name {
  font-size: 0.88rem;
  color: var(--text);
  white-space: nowrap;
}

.stats-rank-bar-wrap {
  flex: 1;
  height: 8px;
  background: #f0f0f0;
  border-radius: 4px;
  overflow: hidden;
}

.stats-rank-bar {
  height: 100%;
  background: var(--blue);
  border-radius: 4px;
  transition: width 0.5s ease;
}

.stats-rank-val {
  font-size: 0.8rem;
  color: var(--muted);
  min-width: 60px;
  text-align: right;
}

/* Tool stats */
.stats-tool-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stats-tool-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: #f8f9fc;
  border-radius: 8px;
}

.stats-tool-name {
  font-size: 0.9rem;
  color: var(--text);
}

.stats-tool-count {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--blue);
}

@media (max-width: 768px) {
  .stats-overview { grid-template-columns: repeat(2, 1fr); }
  .stats-grid-2col { grid-template-columns: 1fr; }
  .stats-card-value { font-size: 1.4rem; }
}

/* === AI 一句话报价 === */
.qt-ai-section {
  background: linear-gradient(135deg, var(--blue-light), #ffffff);
  border: 1px solid var(--blue-light);
}
.qt-ai-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  background: var(--blue);
  border-radius: 10px;
  padding: 1px 8px;
  vertical-align: middle;
  margin-left: 4px;
}
.qt-ai-tip { font-size: 0.85rem; margin-bottom: 14px; }
.qt-ai-input-row { display: flex; gap: 10px; max-width: 780px; margin: 0 auto; }
.qt-ai-input { flex: 1; }
.qt-ai-btn { white-space: nowrap; }
.qt-ai-status { font-size: 0.85rem; margin-top: 10px; }
.qt-ai-status.err { color: #dc2626; }
.qt-ai-status.ok { color: #16a34a; }
.qt-ai-status.loading { color: var(--muted); }

/* === AI 识别确认卡 === */
.qt-ai-modal {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.qt-ai-modal.active { display: flex; }
.qt-ai-card {
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: 28px;
  max-width: 560px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
}
.qt-ai-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.qt-ai-card-header h3 { font-size: 1.15rem; }
.qt-ai-card-note { font-size: 0.82rem; color: var(--muted); margin-bottom: 14px; }
.qt-ai-c-match {
  font-size: 0.85rem;
  padding: 8px 12px;
  border-radius: var(--radius);
  margin-bottom: 16px;
}
.qt-ai-c-match.ok { background: #f0fdf4; color: #16a34a; border: 1px solid #bbf7d0; }
.qt-ai-c-match.warn { background: #fff8e6; color: #d4880f; border: 1px solid #ffe7ba; }
.qt-ai-c-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.qt-ai-c-item label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 5px;
}
.qt-ai-c-item input, .qt-ai-c-item select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.92rem;
  outline: none;
}
.qt-ai-c-item input:focus, .qt-ai-c-item select:focus { border-color: var(--blue); }
.qt-ai-c-full { grid-column: 1 / -1; }
.qt-ai-c-type { font-size: 0.95rem; font-weight: 600; color: var(--ink); }
.qt-ai-type-wrap { position: relative; }
.qt-ai-type-wrap input { padding-right: 34px; }
.qt-ai-type-toggle {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px 6px;
}
.qt-ai-type-toggle:hover { color: var(--blue); }
.qt-ai-type-list {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  margin: 0;
  padding: 4px 0;
  list-style: none;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 6px 20px rgba(0,0,0,0.12);
  max-height: 220px;
  overflow-y: auto;
  z-index: 20;
}
.qt-ai-type-list.active { display: block; }
.qt-ai-type-list li { padding: 8px 12px; font-size: 0.92rem; cursor: pointer; }
.qt-ai-type-list li:hover { background: #f0f6ff; color: var(--blue); }
.qt-ai-c-toggles { display: flex; align-items: center; gap: 20px; }
.qt-ai-c-toggle { display: flex; align-items: center; gap: 6px; font-size: 0.9rem; cursor: pointer; }
.qt-ai-c-toggle input { width: 16px; height: 16px; accent-color: var(--blue); cursor: pointer; }
.qt-ai-card-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 22px;
}

/* === AI 设置（管理端）=== */
.qt-ai-settings-tip { font-size: 0.85rem; margin-bottom: 12px; }
.qt-ai-key-row { display: flex; gap: 10px; max-width: 520px; }
.qt-ai-key-row input { flex: 1; }
.qt-ai-key-status { font-size: 0.85rem; margin-top: 10px; }
.qt-ai-key-status.ok { color: #16a34a; }
.qt-ai-key-status.err { color: #dc2626; }

@media (max-width: 560px) {
  .qt-ai-input-row { flex-direction: column; }
  .qt-ai-c-grid { grid-template-columns: 1fr; }
  .qt-ai-key-row { flex-direction: column; }
}

/* === 留言板 === */
.gb-section { margin-top: 56px; }
.gb-title { text-align: center; font-size: 1.5rem; font-weight: 700; color: var(--ink); margin-bottom: 20px; }
.gb-card {
  max-width: 1000px;
  margin: 0 auto;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
}
.gb-intro { color: var(--muted); font-size: 0.95rem; margin-bottom: 14px; text-align: center; }
.gb-field { margin-bottom: 14px; }
.gb-field > label { display: block; font-weight: 600; margin-bottom: 8px; color: var(--ink); }
.gb-textarea { min-height: 84px; resize: vertical; line-height: 1.6; }
.gb-count { text-align: right; font-size: 0.8rem; color: var(--muted); margin-top: 6px; }
.gb-captcha-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.gb-captcha-question {
  font-size: 1.1rem; font-weight: 700; color: var(--blue);
  background: #f0f5ff; border: 1px solid #d9e5ff; border-radius: var(--radius);
  padding: 8px 16px; white-space: nowrap; letter-spacing: 1px;
}
.gb-captcha-input { max-width: 120px; text-align: center; font-weight: 600; }
.gb-captcha-refresh { white-space: nowrap; }
.gb-status { min-height: 1.2em; font-size: 0.9rem; margin: 4px 0 16px; }
.gb-status.ok { color: #16a34a; }
.gb-status.err { color: #dc2626; }
.gb-submit { min-width: 160px; margin-left: auto; }

/* === 后台留言管理 === */
.gb-admin-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.gb-admin-tip { font-size: 0.85rem; margin: 6px 0 16px; }
.gb-msg-list { display: flex; flex-direction: column; gap: 12px; }
.gb-msg-item {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 16px; background: #fff;
}
.gb-msg-content { white-space: pre-wrap; word-break: break-word; color: var(--ink); line-height: 1.6; }
.gb-msg-meta {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: 10px; font-size: 0.8rem; color: var(--muted);
}
.gb-msg-del { color: #dc2626; background: none; border: none; cursor: pointer; font-size: 0.8rem; padding: 2px 6px; }
.gb-msg-del:hover { text-decoration: underline; }
.gb-msg-empty { text-align: center; color: var(--muted); padding: 32px 0; }

@media (max-width: 560px) {
  .gb-card { padding: 20px; }
  .gb-captcha-input { max-width: 90px; }
}