/* Nitin Auto Industries - Design Language */
/* Based on https://www.nitinautoindustries.com/ */

:root {
  /* 主题配色 - from nitinautoindustries.com design language */
  --theme-primary: #0055AD;
  --theme-primary-rgb: 0, 85, 173;
  --theme-secondary: #00A699;
  --theme-secondary-rgb: 0, 166, 153;
  --theme-accent: #72AE44;
  --theme-accent-rgb: 114, 174, 68;

  /* 中性色 */
  --theme-white: #FFFFFF;
  --theme-off-white: #F8F9F8;
  --theme-light-gray: #F0F2F5;
  --theme-medium-gray: #999999;
  --theme-dark-gray: #2F333A;
  --theme-border: #C1BEBE;
  --theme-bg-light: #F4F4F4;

  /* 文字色 */
  --theme-text-body: #212529;
  --theme-text-heading: #181818;
  --theme-text-muted: #4F4F4F;
  --theme-text-white: #FFFFFF;
  --theme-text-dark: #000000;

  /* 链接 */
  --theme-link-color: #212529;
  --theme-link-hover-bg: #0055AD;

  /* 按钮 */
  --theme-btn-radius: 6px;
  --theme-btn-bg: #0055AD;
  --theme-btn-text: #FFFFFF;
  --theme-btn-padding: 10px 25px;
  --theme-btn-font-size: 16px;
  --theme-btn-font-weight: 600;
  --theme-btn-border: 1px solid #0055AD;

  /* 输入框 */
  --theme-input-bg: transparent;
  --theme-input-color: #4F4F4F;
  --theme-input-border: 1px solid #F0F2F5;
  --theme-input-radius: 4px;
  --theme-input-padding: 0px 20px;
  --theme-input-font-size: 14px;
  --theme-input-focus-bg: #F0F2F5;
  --theme-input-focus-color: #000000;

  /* 遮罩 */
  --theme-overlay: rgba(0, 0, 0, 0.4);

  /* 字体 */
  --theme-font-primary: 'Inter', 'PingFang SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --theme-font-body-size: 14px;
  --theme-font-body-line-height: 1.4;
  --theme-font-h1-size: 21px;
  --theme-font-h2-size: 26px;
  --theme-font-h3-size: 24px;
  --theme-font-h4-size: 18px;

  /* 间距 */
  --theme-container-max: 1270px;
  --theme-section-gap: 50px;
  --theme-block-padding: 40px;
  --theme-inline-padding: clamp(20px, 3vw, 40px);

  /* 阴影 */
  --theme-shadow-sm: 1px 1px 4px rgba(0, 0, 0, 0.2);
  --theme-shadow-md: 0px 0px 10px rgba(0, 0, 0, 0.2);
  --theme-shadow-nav: 0px 0px 20px 1px rgba(0, 0, 0, 0.4);
  --theme-shadow-card-hover: 0px 4px 12px rgba(0, 0, 0, 0.2);

  /* Transition */
  --theme-transition: 0.3s ease-in-out;
  --theme-transition-fast: 0.15s ease-in-out;
}

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

body {
  font-family: var(--theme-font-primary);
  font-size: var(--theme-font-body-size);
  font-weight: 400;
  line-height: var(--theme-font-body-line-height);
  background-color: var(--theme-bg-light);
  color: var(--theme-text-body);
}

/* Header */
.nitin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 40px;
  background: var(--theme-white);
}

.nitin-logo-area { display: flex; align-items: center; gap: 12px; }

.nitin-logo-img { width: 60px; height: 60px; background: var(--theme-primary); border-radius: 0px; }

.nitin-logo-text h1 {
  font-size: var(--theme-font-h1-size);
  font-weight: 500;
  color: var(--theme-text-heading);
}

.nitin-logo-text p { font-size: 12px; color: var(--theme-text-muted); }

.nitin-header-right { display: flex; align-items: center; gap: 20px; }

.nitin-call-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--theme-text-muted);
  font-size: var(--theme-font-body-size);
}

.nitin-call-btn svg { fill: var(--theme-primary); }

.nitin-email-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: var(--theme-btn-padding);
  background: var(--theme-btn-bg);
  border: var(--theme-btn-border);
  border-radius: var(--theme-btn-radius);
  color: var(--theme-btn-text);
  font-size: var(--theme-btn-font-size);
  font-weight: var(--theme-btn-font-weight);
  cursor: pointer;
  transition: var(--theme-transition);
}

.nitin-email-btn:hover {
  background: var(--theme-white);
  color: var(--theme-primary);
}

.nitin-email-btn:hover svg { fill: var(--theme-primary); }

.nitin-email-btn svg { fill: var(--theme-white); }

/* Navigation - Sticky Fixed */
.nitin-nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
    height: 50px;
    background: var(--theme-dark-gray);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--theme-shadow-nav);
}

.nitin-nav-links { display: flex; align-items: center; gap: 30px; }

.nitin-nav-links a {
  color: var(--theme-text-white);
  font-size: var(--theme-font-body-size);
  font-weight: 400;
  text-decoration: none;
  transition: color var(--theme-transition-fast);
}

.nitin-nav-links a:hover { color: var(--theme-primary); background: none; }

.nitin-nav-links .nitin-products-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: var(--theme-text-white);
}

.nitin-search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--theme-input-radius);
  width: 280px;
  height: 36px;
}

.nitin-search-box input {
  border: none;
  outline: none;
  background: transparent;
  font-size: var(--theme-input-font-size);
  color: var(--theme-text-white);
  width: 100%;
}

.nitin-search-box input::placeholder { color: rgba(255, 255, 255, 0.6); }

.nitin-search-box svg { fill: var(--theme-text-white); }

/* Content Area */
.nitin-content-area {
  display: flex;
  gap: 24px;
  width: min(1260px, calc(100% - 40px));
  padding: var(--theme-block-padding) 0;
  background: var(--theme-bg-light);
  min-height: calc(100vh - 200px);
  margin: 0 auto;
}

/* Sidebar */
.nitin-sidebar {
  width: 240px;
  background: var(--theme-white);
  border-radius: 8px;
  padding: 20px;
  border: 1px solid var(--theme-border);
  height: fit-content;
  position: sticky;
  top: 70px;
  z-index: 1;
}

.nitin-sidebar-title {
  font-size: var(--theme-font-h4-size);
  font-weight: 600;
  color: var(--theme-text-heading);
  margin-bottom: 8px;
}

.nitin-category-item {
  height: 40px;
  display: flex;
  align-items: center;
  padding: 12px;
  border-radius: 4px;
  cursor: pointer;
  margin-bottom: 4px;
  transition: background-color var(--theme-transition-fast);
  text-decoration: none;
  color: var(--theme-link-color);
  font-size: var(--theme-font-body-size);
}

.nitin-category-item span { font-size: var(--theme-font-body-size); }

.nitin-category-item:hover { background: var(--theme-light-gray); }

.nitin-category-item.active { background: var(--theme-primary); color: var(--theme-text-white); }
.nitin-category-item.active span { color: var(--theme-text-white); }
.nitin-category-item.active:hover { background: var(--theme-primary); }

/* Products Area */
.nitin-products-area { flex: 1; display: flex; flex-direction: column; gap: 24px; }

.nitin-products-header { display: flex; justify-content: space-between; align-items: center; }

.nitin-products-title {}

.nitin-view-all {
  font-size: var(--theme-font-body-size);
  color: var(--theme-primary);
  cursor: pointer;
}

.nitin-products-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

.nitin-product-row { display: contents; }

.nitin-product-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
  background: var(--theme-white);
  border-radius: 8px;
  border: 1px solid #E5E5E5;
  transition: box-shadow var(--theme-transition);
}

.nitin-product-card > a:first-of-type {
  display: block;
  width: 100%;
  line-height: 0;
}

.nitin-product-title-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.nitin-product-card:hover {
  border-color: #D6E3F3;
  box-shadow: 0 6px 18px rgba(0, 85, 173, 0.08);
}

.nitin-product-card img {
  width: 100%;
  height: 160px;
  object-fit: contain;
  background: var(--theme-bg-light);
  border-radius: 4px;
}

.nitin-product-info { display: flex; flex-direction: column; gap: 8px; }

.nitin-product-title {}

.nitin-product-sku { font-size: 12px; color: var(--theme-text-muted); }

.nitin-product-price {
  font-size: 14px;
  font-weight: 600;
  color: var(--theme-primary);
}

.nitin-product-name {
  font-size: var(--theme-font-body-size);
  font-weight: 600;
  color: var(--theme-text-heading);
}

.nitin-product-specs { display: flex; flex-direction: column; gap: 2px; font-size: 11px; color: var(--theme-text-muted); }

.nitin-get-quote-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 36px;
  background: var(--theme-btn-bg);
  border: var(--theme-btn-border);
  border-radius: var(--theme-btn-radius);
  color: var(--theme-btn-text);
  font-size: 13px;
  font-weight: var(--theme-btn-font-weight);
  cursor: pointer;
  transition: var(--theme-transition);
}

.nitin-get-quote-btn:hover {
  background: var(--theme-white);
  color: var(--theme-primary);
}

/* Footer Info - 独立浅色区域 */
.nitin-footer-info { 
    padding: 60px 0; 
    background: var(--theme-off-white);
}

.nitin-footer-info-shell {
    width: min(1260px, calc(100% - 40px));
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    gap: 30px;
}

.nitin-info-box { 
    flex: 1; 
    display: flex; 
    flex-direction: column; 
    gap: 16px; 
    padding: 30px; 
    background: var(--theme-white);
    border-radius: 8px;
    border: 1px solid var(--theme-border);
    transition: transform var(--theme-transition), box-shadow var(--theme-transition);
}

.nitin-info-box:hover {
    transform: translateY(-3px);
    box-shadow: var(--theme-shadow-sm);
}

.nitin-info-header { 
    display: flex; 
    align-items: center; 
    gap: 12px; 
}

.nitin-info-header svg { 
    fill: var(--theme-primary);
}

.nitin-info-header h3 { 
    font-family: var(--theme-font-primary);
    font-size: var(--theme-font-h4-size);
    font-weight: 600;
    color: var(--theme-text-heading);
    line-height: 1.2;
}

.nitin-info-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nitin-info-content p {
    font-family: var(--theme-font-primary);
    font-size: var(--theme-font-body-size);
    color: var(--theme-text-muted);
    line-height: 1.6;
}

/* Bottom Footer */
.nitin-bottom-footer {
  padding: 40px 0;
  background: var(--theme-text-heading);
}

.nitin-footer-shell {
  width: min(1260px, calc(100% - 40px));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 60px;
}

.nitin-footer-section { flex: 1; display: flex; flex-direction: column; gap: 20px; }

.nitin-footer-section--about { max-width: 520px; }
.nitin-footer-section--message { width: 404px; flex: 0 0 404px; }

.nitin-footer-section h4 {
  font-family: var(--theme-font-primary);
  font-size: var(--theme-font-h4-size);
  font-weight: 600;
  color: var(--theme-text-white);
  line-height: 1.2;
}

.nitin-footer-about-text {
  font-family: var(--theme-font-primary);
  font-size: var(--theme-font-body-size);
  color: var(--theme-medium-gray);
  line-height: 1.6;
  margin: 0;
}

.nitin-footer-highlight-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nitin-footer-highlight-list span {
  color: var(--theme-primary);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
}

.nitin-footer-list { display: flex; flex-direction: column; gap: 12px; }

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

.nitin-contact-row svg { fill: var(--theme-primary); }

.nitin-contact-row span {
  font-family: var(--theme-font-primary);
  font-size: var(--theme-font-body-size);
  color: var(--theme-medium-gray);
  line-height: 1.6;
}

.nitin-footer-message-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.nitin-footer-form-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nitin-footer-form-field span {
  color: var(--theme-text-white);
  font-size: 12px;
  font-weight: 500;
}

.nitin-footer-input {
  width: 100%;
  height: 40px;
  padding: 0 14px;
  background: #2D2D2D;
  border: 1px solid #E5E5E5;
  border-radius: 4px;
  color: var(--theme-text-white);
  font-family: var(--theme-font-primary);
  font-size: 14px;
  line-height: 1.6;
  outline: none;
}

.nitin-footer-input::placeholder {
  color: #999999;
  font-family: var(--theme-font-primary);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.6;
}

.nitin-footer-textarea {
  min-height: 80px;
  padding: 12px 14px;
  resize: vertical;
}

.nitin-footer-message-btn {
  width: 100%;
  height: 40px;
  border: 1px solid #0055AD;
  border-radius: 4px;
  background: #0055AD;
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.nitin-footer-message-btn:hover {
  background: #FFFFFF;
  color: #0055AD;
}

/* Modal Popup */
.nitin-modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--theme-overlay);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.nitin-modal-overlay.active {
    display: flex;
}

.nitin-modal-container {
    width: 400px;
    background: var(--theme-white);
    border-radius: 8px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    margin: auto;
}

.nitin-modal-header { display: flex; justify-content: space-between; align-items: center; }

.nitin-modal-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--theme-text-heading);
}

.nitin-modal-close { font-size: 24px; color: var(--theme-text-muted); cursor: pointer; }

.nitin-modal-fields { display: flex; flex-direction: column; gap: 16px; }

.nitin-modal-field { display: flex; flex-direction: column; gap: 8px; }

.nitin-modal-label {
  font-size: var(--theme-font-body-size);
  font-weight: 500;
  color: var(--theme-text-heading);
}

.nitin-modal-input {
  width: 100%;
  height: 48px;
  padding: 12px 16px;
  background: transparent;
  border: var(--theme-input-border);
  border-radius: var(--theme-input-radius);
  font-size: var(--theme-font-body-size);
  color: var(--theme-input-color);
  outline: none;
  transition: var(--theme-transition-fast);
}

.nitin-modal-input:focus {
  border-color: var(--theme-primary);
  background: var(--theme-input-focus-bg);
  color: var(--theme-input-focus-color);
}

.nitin-modal-textarea { height: 80px; resize: vertical; }

.phone-input-group { display: flex; gap: 8px; height: 48px; }

.country-code-select {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  background: transparent;
  border: var(--theme-input-border);
  border-radius: var(--theme-input-radius);
  min-width: 120px;
  font-size: var(--theme-font-body-size);
  font-weight: 500;
  color: var(--theme-text-heading);
  cursor: pointer;
  outline: none;
}

.country-code-select:focus { border-color: var(--theme-primary); }

.phone-number-input {
  flex: 1;
  height: 48px;
  padding: 12px 16px;
  background: transparent;
  border: var(--theme-input-border);
  border-radius: var(--theme-input-radius);
  font-size: var(--theme-font-body-size);
  outline: none;
  transition: var(--theme-transition-fast);
}

.phone-number-input:focus { border-color: var(--theme-primary); }

.lm-success-message {
  display: none;
  padding: 12px 16px;
  background: #DFF0D8;
  color: #3C763D;
  border-radius: var(--theme-input-radius);
  text-align: center;
  font-size: var(--theme-font-body-size);
  margin-top: 12px;
}

.lm-error-message {
  display: none;
  padding: 12px 16px;
  background: #F2DEDE;
  color: #A94442;
  border-radius: var(--theme-input-radius);
  text-align: center;
  font-size: var(--theme-font-body-size);
  margin-top: 12px;
}

.nitin-modal-submit {
  width: 100%;
  height: 48px;
  background: var(--theme-btn-bg);
  border: var(--theme-btn-border);
  border-radius: var(--theme-btn-radius);
  color: var(--theme-btn-text);
  font-size: var(--theme-btn-font-size);
  font-weight: var(--theme-btn-font-weight);
  cursor: pointer;
  margin-top: 10px;
  transition: var(--theme-transition);
}

.nitin-modal-submit:hover {
  background: var(--theme-white);
  color: var(--theme-primary);
}

.nitin-modal-note { font-size: 12px; color: var(--theme-text-muted); text-align: center; }

/* Hidden product cards */
.nitin-hidden { display: none !important; }

/* Responsive adjustments */
@media (max-width: 1280px) {
    .nitin-products-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 992px) {
    .nitin-content-area { flex-direction: column; }
    .nitin-sidebar { width: 100%; }
    .nitin-products-grid { grid-template-columns: repeat(3, 1fr); }
    .nitin-footer-info { padding: 40px 0; }
    .nitin-footer-info-shell { width: min(1260px, calc(100% - 40px)); }
    .nitin-footer-shell { width: min(1260px, calc(100% - 40px)); gap: 40px; }
    .nitin-footer-section--message { width: auto; flex: 1; }
}

@media (max-width: 768px) {
    .nitin-header { padding: 15px 20px; flex-wrap: wrap; gap: 15px; }
    .nitin-header-right { width: 100%; justify-content: space-between; }
    .nitin-call-btn { font-size: 12px; }
    .nitin-email-btn { padding: 10px 15px; font-size: 13px; }
    .nitin-nav-bar { padding: 0 20px; flex-wrap: wrap; height: auto; padding: 15px 20px; }
    .nitin-nav-links { gap: 15px; flex-wrap: wrap; }
    .nitin-nav-links a { font-size: 13px; }
    .nitin-search-box { width: 100%; margin-top: 10px; order: 3; }
    .nitin-content-area { width: min(1260px, calc(100% - 40px)); padding: 20px 0; flex-direction: column; }
    .nitin-sidebar { 
        width: 100%; 
        padding: 12px 15px; 
        display: flex; 
        flex-wrap: wrap; 
        gap: 8px; 
        position: relative; 
        border-radius: 8px;
        margin-bottom: 16px;
    }
    .nitin-sidebar-title { 
        width: 100%; 
        margin-bottom: 8px; 
        font-size: 14px;
    }
    .nitin-category-item {
        height: 32px;
        padding: 6px 12px;
        margin-bottom: 0;
        flex-shrink: 0;
        border-radius: 4px;
        flex: 0 0 auto;
        text-decoration: none;
    }
    .nitin-category-item span { font-size: 12px; }
    .nitin-footer-info { padding: 20px 0; }
    .nitin-footer-info-shell { flex-direction: column; width: min(1260px, calc(100% - 40px)); }
    .nitin-footer-shell { flex-direction: column; gap: 40px; }
    .nitin-footer-section--message { width: 100%; flex: 1; }
    .nitin-products-grid { grid-template-columns: repeat(2, 1fr); }
    .nitin-modal-container { width: 95%; padding: 24px; max-width: none; }
    .nitin-modal-title { font-size: 18px; }
    .nitin-modal-input { height: 44px; font-size: 16px; }
    .nitin-modal-submit { height: 44px; font-size: 15px; }
}

@media (max-width: 576px) {
    .nitin-header { padding: 12px 15px; }
    .nitin-logo-img { width: 45px; height: 45px; }
    .nitin-logo-img svg { width: 45px; height: 45px; }
    .nitin-logo-text h1 { font-size: 16px; }
    .nitin-logo-text p { font-size: 11px; }
    .nitin-call-btn svg, .nitin-email-btn svg { width: 14px; height: 14px; }
    .nitin-nav-links { gap: 10px; }
    .nitin-nav-links a { font-size: 12px; }
    .nitin-nav-links .nitin-products-link svg { width: 14px; height: 14px; }
    .nitin-content-area { width: min(1260px, calc(100% - 30px)); padding: 15px 0; }
    .nitin-sidebar { padding: 10px 12px; gap: 6px; }
    .nitin-sidebar-title { font-size: 13px; margin-bottom: 6px; }
    .nitin-category-item { height: 28px; padding: 5px 10px; }
    .nitin-category-item span { font-size: 11px; }
    .nitin-products-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .nitin-product-card { padding: 10px; }
    .nitin-product-card img { height: 120px; }
    .nitin-product-title,
    .nitin-card-title { font-size: 12px; }
    .nitin-product-price { font-size: 11px; }
    .nitin-product-specs { font-size: 10px; }
    .nitin-get-quote-btn { height: 32px; font-size: 12px; }
    .nitin-info-box { padding: 15px; }
    .nitin-info-header h3 { font-size: 16px; }
    .nitin-info-content p { font-size: 12px; }
    .nitin-footer-section h4 { font-size: 16px; }
    .nitin-modal-container { padding: 20px; }
    .nitin-modal-title { font-size: 16px; }
    .nitin-modal-fields { gap: 12px; }
    .nitin-modal-field { gap: 6px; }
    .nitin-modal-label { font-size: 13px; }
    .nitin-modal-input { height: 42px; padding: 10px 14px; font-size: 16px; }
    .phone-input-group { flex-direction: column; height: auto; gap: 8px; }
    .country-code-select { min-width: 100%; height: 42px; font-size: 16px; }
    .phone-number-input { width: 100%; height: 42px; font-size: 16px; }
    .nitin-modal-submit { height: 42px; font-size: 14px; }
    .nitin-modal-note { font-size: 11px; }
    .lm-success-message, .lm-error-message { padding: 10px 14px; font-size: 13px; }
}
/* ===== Global UI Enhancements ===== */

/* 字体系统 */
h1, h2 { font-weight: 700; line-height: 1.2; }
h3, h4, h5, h6 { font-weight: 600; line-height: 1.2; }
p { font-size: var(--theme-font-body-size); line-height: var(--theme-font-body-line-height); margin-bottom: 0; }

/* 按钮增强 */
button, .dt-btn, input[type="submit"] {
  font-size: var(--theme-btn-font-size);
  font-weight: var(--theme-btn-font-weight);
  transition: var(--theme-transition);
}

/* 链接样式 */
a { color: var(--theme-link-color); text-decoration: none; transition: color var(--theme-transition-fast); }
a:hover { color: var(--theme-primary); }

/* 卡片 Hover */
.category-card, .product-card, .card {
  transition: transform var(--theme-transition), box-shadow var(--theme-transition);
}

.category-card:hover, .product-card:hover, .card:hover {
  transform: translateY(-3px);
  box-shadow: var(--theme-shadow-card-hover);
}

/* 输入框样式 */
input[type="text"], input[type="email"], textarea {
  font-size: var(--theme-input-font-size);
  transition: var(--theme-transition-fast);
}

/* 容器和间距 */
.container { max-width: var(--theme-container-max); padding: 0 15px; }

/* 响应式标题 */
h1 { font-size: var(--theme-font-h1-size); }
h2 { font-size: var(--theme-font-h2-size); }
h3 { font-size: var(--theme-font-h3-size); }

/* 导航栏 */
nav, .navigation { font-size: var(--theme-font-body-size); font-weight: 400; }

/* Footer 增强 */
footer, .site-footer { font-size: var(--theme-font-body-size); }

/* ===== 文字滚动按钮效果 ===== */

.dt-btn,
button,
.button,
.nitin-get-quote-btn,
.nitin-footer-quote-btn,
.nitin-modal-submit,
.nitin-email-btn {
    position: relative;
    overflow: hidden;
    background: var(--theme-btn-bg) !important;
    color: var(--theme-btn-text) !important;
    border: var(--theme-btn-border);
}

.dt-btn .letter-span,
button .letter-span,
.button .letter-span,
.nitin-get-quote-btn .letter-span,
.nitin-footer-quote-btn .letter-span,
.nitin-modal-submit .letter-span,
.nitin-email-btn .letter-span {
    display: inline-block;
    pointer-events: none;
    transition: transform 0.4s ease-out, opacity 0.4s ease-out;
}

.dt-btn .letter-span.text-spin,
button .letter-span.text-spin,
.button .letter-span.text-spin,
.nitin-get-quote-btn .letter-span.text-spin,
.nitin-footer-quote-btn .letter-span.text-spin,
.nitin-modal-submit .letter-span.text-spin,
.nitin-email-btn .letter-span.text-spin {
    animation: letter-flip 0.4s 1;
}

@keyframes letter-flip {
    0% { transform: rotateY(0deg); opacity: 1; }
    50% { transform: rotateY(180deg); opacity: 0.5; }
    100% { transform: rotateY(360deg); opacity: 1; }
}

@-webkit-keyframes letter-flip {
    0% { -webkit-transform: rotateY(0deg); opacity: 1; }
    50% { -webkit-transform: rotateY(180deg); opacity: 0.5; }
    100% { -webkit-transform: rotateY(360deg); opacity: 1; }
}

@keyframes text-spin {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; }
    50% { transform: translateY(-100%) rotate(90deg); opacity: 0; }
    100% { transform: translateY(0) rotate(0deg); opacity: 1; }
}

@-webkit-keyframes text-spin {
    0% { -webkit-transform: translateY(0) rotate(0deg); opacity: 1; }
    50% { -webkit-transform: translateY(-100%) rotate(90deg); opacity: 0; }
    100% { -webkit-transform: translateY(0) rotate(0deg); opacity: 1; }
}

/* 默认应用文字滚动效果 */
body .dt-btn span,
body button[type="submit"] span,
body .button span {
    display: inline-block;
}

/* Basic page */
.nitin-basic-page-shell { min-height: calc(100vh - 300px); }
.nitin-page-card { max-width: 900px; margin: 40px auto; padding: 50px; background: var(--theme-white); border: 1px solid var(--theme-border); }
.nitin-page-title { font-size: 32px; color: var(--theme-text-heading); margin-bottom: 30px; padding-bottom: 15px; border-bottom: 2px solid var(--theme-primary); }
.nitin-page-content { font-size: 16px; line-height: 1.8; color: var(--theme-text-muted); }

/* Shared typography */
.nitin-title-xl {
  font-family: var(--theme-font-primary);
  font-size: 28px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--theme-text-heading);
}

.nitin-title-sm {
  font-family: var(--theme-font-primary);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.2;
}

.nitin-card-title {
  font-family: var(--theme-font-primary);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--theme-text-heading);
}

.nitin-copy-md {
  font-family: var(--theme-font-primary);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
}

.nitin-copy-sm {
  font-family: var(--theme-font-primary);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.6;
}

/* Shared sections */
.nitin-section,
.nitin-detail-top-shell,
.nitin-detail-faq-section,
.nitin-detail-related-section { padding: 40px 0; }
.nitin-section--soft { background: var(--theme-bg-light); }
.nitin-section-shell { width: min(1260px, calc(100% - 40px)); margin: 0 auto; }
.nitin-section-title,
.nitin-section-heading h2,
.nitin-products-title,
.nitin-detail-title {
  font-family: var(--theme-font-primary);
  font-size: 28px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--theme-text-heading);
  margin-bottom: 16px;
}
.nitin-section-heading--center { text-align: center; }
.nitin-section-heading p,
.nitin-about-intro,
.nitin-page-hero p,
.nitin-detail-description { font-family: var(--theme-font-primary); font-size: 16px; font-weight: 400; color: var(--theme-text-muted); line-height: 1.6; }

/* Detail page */
.nitin-detail-page-shell { background: var(--theme-bg-light); }
.nitin-detail-top { display: grid; grid-template-columns: minmax(0, 560px) minmax(0, 1fr); gap: 24px; }
.nitin-detail-gallery-card,
.nitin-detail-info-card { background: var(--theme-white); border: 1px solid #E5E5E5; border-radius: 8px; }
.nitin-detail-gallery-card { padding: 16px; }
.nitin-carousel-container { position: relative; width: 100%; height: 400px; background: #E5E5E5; border-radius: 8px; overflow: hidden; }
.nitin-carousel-slide { display: none; width: 100%; height: 100%; }
.nitin-carousel-slide.active { display: block; }
.nitin-carousel-slide img { width: 100%; height: 100%; object-fit: contain; }
.nitin-thumbnail-row { display: flex; justify-content: center; gap: 8px; margin-top: 16px; }
.nitin-thumbnail { width: 80px; height: 80px; border: 1px solid #2D2D2D; cursor: pointer; background: #E5E5E5; overflow: hidden; }
.nitin-thumbnail.active { border: 2px solid var(--theme-primary); }
.nitin-thumbnail img { width: 100%; height: 100%; object-fit: cover; }
.nitin-detail-info-card { padding: 24px; display: flex; flex-direction: column; gap: 16px; }
.nitin-detail-title {
  margin: 0;
}
.nitin-detail-sku { color: var(--theme-text-muted); margin: 0; }
.nitin-detail-divider { width: 100%; height: 1px; background: #E5E5E5; }
.nitin-detail-price-box { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.nitin-detail-current-price { font-size: 28px; font-weight: 700; color: var(--theme-primary); }
.nitin-detail-original-price { font-size: 16px; color: var(--theme-text-muted); }
.nitin-detail-action-row { padding-top: 8px; }
.nitin-faq-list { display: flex; flex-direction: column; gap: 16px; }
.nitin-faq-card { background: var(--theme-light-gray); border-radius: 8px; padding: 16px; }
.nitin-faq-card h3 { font-size: 16px; color: var(--theme-primary); margin-bottom: 8px; }
.nitin-faq-card p { margin: 0; color: var(--theme-text-muted); }
.nitin-related-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.nitin-related-card { background: var(--theme-white); border: 1px solid #E5E5E5; border-radius: 8px; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.nitin-related-card img { width: 100%; height: 180px; object-fit: cover; border-radius: 4px; background: #E5E5E5; }
.nitin-related-title { text-align: center; font-weight: 600; }

/* Marketing pages */
.nitin-marketing-page { background: var(--theme-white); }
.nitin-page-hero { min-height: 360px; display: flex; align-items: center; color: var(--theme-text-white); background: linear-gradient(135deg, rgba(0, 85, 173, 0.95), rgba(0, 85, 173, 0.65)); }
.nitin-page-hero--landing { min-height: 400px; }
.nitin-page-hero--about { min-height: 400px; background: linear-gradient(135deg, rgba(0, 85, 173, 0.85), rgba(26, 26, 26, 0.65)); }
.nitin-hero-shell { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 20px; }
.nitin-eyebrow { display: inline-flex; padding: 8px 14px; border: 1px solid rgba(255,255,255,0.45); border-radius: 999px; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; }
.nitin-page-hero h1 { font-size: clamp(34px, 5vw, 48px); color: var(--theme-text-white); }
.nitin-page-hero p { max-width: 820px; color: rgba(255,255,255,0.92); font-size: 18px; }
.nitin-hero-actions { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }
.nitin-primary-cta,
.nitin-secondary-cta { display: inline-flex; align-items: center; justify-content: center; min-width: 180px; height: 44px; padding: 0 24px; border-radius: 4px; font-weight: 600; }
.nitin-primary-cta { background: var(--theme-white); color: var(--theme-primary); }
.nitin-secondary-cta { border: 1px solid rgba(255,255,255,0.5); color: var(--theme-text-white); }
.nitin-company-intro { display: flex; flex-direction: column; gap: 40px; }
.nitin-factory-image-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.nitin-factory-image-card { background: var(--theme-white); border: 1px solid #E5E5E5; border-radius: 8px; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.nitin-factory-image-placeholder { height: 220px; border-radius: 8px; background: linear-gradient(135deg, #dfe8f5, #f3f6fa); display: flex; align-items: center; justify-content: center; text-align: center; color: var(--theme-primary); font-weight: 600; padding: 20px; }
.nitin-factory-image-card p { margin: 0; color: var(--theme-text-muted); }
.nitin-stat-grid,
.nitin-review-grid,
.nitin-feature-grid,
.nitin-case-grid { display: grid; gap: 24px; }
.nitin-stat-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.nitin-review-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.nitin-feature-grid--four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.nitin-feature-grid--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.nitin-case-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.nitin-stat-card,
.nitin-review-card,
.nitin-feature-card,
.nitin-case-card { background: var(--theme-white); border: 1px solid #E5E5E5; border-radius: 8px; padding: 24px; }
.nitin-review-card,
.nitin-case-card,
.nitin-feature-card--soft { background: var(--theme-light-gray); }
.nitin-stat-card,
.nitin-feature-card,
.nitin-case-card { display: flex; flex-direction: column; gap: 14px; }
.nitin-stat-card h3,
.nitin-review-card h3,
.nitin-feature-card h3,
.nitin-case-card h3 { font-family: var(--theme-font-primary); font-size: 18px; font-weight: 600; line-height: 1.2; color: var(--theme-text-heading); }
.nitin-stat-card p,
.nitin-review-card p,
.nitin-feature-card p,
.nitin-case-card p { margin: 0; font-family: var(--theme-font-primary); font-size: 14px; line-height: 1.6; color: var(--theme-text-muted); }
.nitin-review-card { display: flex; flex-direction: column; gap: 12px; }
.nitin-review-avatar { width: 48px; height: 48px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: #D7DDE6; color: var(--theme-primary); font-weight: 700; }
.nitin-review-meta,
.nitin-review-product { color: var(--theme-text-muted); font-size: 13px; }
.nitin-review-rating,
.nitin-case-result { color: var(--theme-primary); }
.nitin-review-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.nitin-review-tags span,
.nitin-highlight-pill,
.nitin-model-chip { display: inline-flex; align-items: center; justify-content: center; padding: 8px 14px; border-radius: 999px; font-size: 13px; }
.nitin-review-tags span,
.nitin-highlight-pill { background: var(--theme-primary); color: var(--theme-text-white); }
.nitin-highlight-row,
.nitin-model-chip-row { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; margin-top: 24px; }
.nitin-partner-row { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; margin-bottom: 16px; }
.nitin-partner-chip { display: inline-flex; align-items: center; justify-content: center; min-width: 110px; height: 60px; padding: 0 18px; border: 1px solid #E5E5E5; border-radius: 8px; background: var(--theme-white); color: var(--theme-primary); font-weight: 700; }
.nitin-partner-caption { margin-bottom: 32px; }
.nitin-model-chip { background: var(--theme-white); border: 1px solid #E5E5E5; color: var(--theme-primary); font-weight: 600; }
.nitin-case-country { color: var(--theme-primary); font-size: 12px; font-weight: 600; }

@media (max-width: 1200px) {
  .nitin-detail-top,
  .nitin-factory-image-row,
  .nitin-stat-grid,
  .nitin-review-grid,
  .nitin-feature-grid--four,
  .nitin-case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nitin-feature-grid--three,
  .nitin-related-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  .nitin-detail-top,
  .nitin-factory-image-row,
  .nitin-stat-grid,
  .nitin-review-grid,
  .nitin-feature-grid--four,
  .nitin-feature-grid--three,
  .nitin-case-grid,
  .nitin-related-grid { grid-template-columns: 1fr; }
  .nitin-page-card { margin: 20px auto; padding: 24px; }
  .nitin-carousel-container { height: 280px; }
  .nitin-page-hero p { font-size: 16px; }
}