/* HDNS Pro instruments — kiểu trang danh mục sản phẩm (tham chiếu site B2B Trung Quốc / ASP.NET) */

:root {
  --red: #b30000;
  --red-dark: #8a0000;
  --nav-bg: #333333;
  --nav-hover: #000;
  --border: #d9d9d9;
  --bg-page: #f0f0f0;
  --bg-white: #fff;
  --bg-sidebar: #f7f7f7;
  --text: #333;
  --muted: #666;
  --link: #0066b3;
  --font: "Be Vietnam Pro", Tahoma, Arial, sans-serif;
  --max: 1100px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg-page);
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

.container {
  width: min(var(--max), 100% - 24px);
  margin-inline: auto;
}

/* Top bar — dải đỏ kiểu site công nghiệp */
.top-bar {
  background: linear-gradient(180deg, var(--red) 0%, var(--red-dark) 100%);
  color: #fff;
  font-size: 13px;
  border-bottom: 2px solid #5c0000;
}

.top-bar-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  min-height: 40px;
  padding: 6px 0;
}

.top-welcome {
  margin: 0;
}

.top-welcome strong {
  font-weight: 700;
}

.top-contact {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 6px;
}

.lang-btn {
  border: 1px solid rgba(255, 255, 255, 0.45);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  padding: 6px 8px;
  border-radius: 3px;
  cursor: pointer;
}

.lang-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lang-btn[aria-pressed="true"] {
  background: #fff;
  color: var(--red-dark);
  border-color: #fff;
}

.top-phone {
  color: #fff;
  font-weight: 600;
}

.top-phone:hover {
  color: #ffeb3b;
  text-decoration: none;
}

.top-zalo-label {
  opacity: 0.95;
}

.top-zalo-qr {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 4px;
  background: #fff;
  padding: 2px;
}

/* Header */
.site-header {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
}

.header-main {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px 18px;
  color: inherit;
  flex: 1 1 auto;
  min-width: 0;
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand-logo {
  width: 52px;
  height: 52px;
  border-radius: 4px;
  background: linear-gradient(145deg, #c62828 0%, #8b0000 100%);
  border: 1px solid #900;
  flex-shrink: 0;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  flex: 1 1 12rem;
}

.brand-title {
  font-size: clamp(1.05rem, 2.5vw, 1.35rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--red-dark);
  line-height: 1.2;
}

.brand-tagline {
  font-size: clamp(0.75rem, 1.8vw, 0.875rem);
  font-weight: 600;
  color: #444;
  line-height: 1.4;
  max-width: 26rem;
}

/* Banner — carousel kiểu trang gốc */
.site-banner {
  background: #111;
  border-bottom: 3px solid var(--red-dark);
}

.banner-viewport {
  position: relative;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  overflow: hidden;
  /* Ảnh banner thực tế: ~1916x500 => tỷ lệ ~3.832:1 */
  aspect-ratio: 1916 / 500;
  max-height: 380px;
}

.banner-track {
  display: flex;
  height: 100%;
  transition: transform 0.45s ease;
  will-change: transform;
}

.banner-slide {
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

.banner-slide img {
  width: 100%;
  height: 100%;
  /* Không cắt phần trên/dưới khi ảnh có tỷ lệ khác nhau */
  object-fit: contain;
  background: #111;
  display: block;
}

.banner-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 56px;
  border: none;
  background: rgba(0, 0, 0, 0.45);
  color: #fff;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.banner-nav:hover {
  background: rgba(179, 0, 0, 0.85);
}

.banner-nav:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.banner-prev {
  left: 8px;
}

.banner-next {
  right: 8px;
}

.banner-dots {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 2;
}

.banner-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.85);
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.banner-dot[aria-current="true"] {
  background: #fff;
}

@media (max-width: 600px) {
  .banner-viewport {
    aspect-ratio: 1916 / 500;
    max-height: 260px;
  }

  .banner-nav {
    width: 36px;
    height: 48px;
    font-size: 22px;
  }
}

.header-hotline {
  flex-shrink: 0;
  text-align: right;
  padding: 8px 16px;
  border: 2px solid var(--red);
  border-radius: 4px;
  background: #fffaf0;
}

.header-hotline-label {
  display: block;
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.header-hotline a {
  font-size: 20px;
  font-weight: 700;
  color: var(--red);
}

.header-hotline a:hover {
  text-decoration: none;
  color: var(--red-dark);
}

/* Main nav — thanh đen */
.main-nav {
  background: var(--nav-bg);
  border-top: 1px solid #000;
}

.main-nav-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.main-nav-inner a {
  display: block;
  padding: 12px 20px;
  color: #eee;
  font-weight: 600;
  font-size: 14px;
  border-right: 1px solid #444;
}

.main-nav-inner a:hover {
  background: var(--nav-hover);
  color: #fff;
  text-decoration: none;
}

.main-nav-inner a.is-active {
  background: var(--red);
  color: #fff;
}

/* Page */
.page-frame {
  background: var(--bg-white);
  margin-top: 12px;
  margin-bottom: 12px;
  padding: 16px 20px 28px;
  border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.breadcrumb {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.bc-sep {
  margin: 0 6px;
  color: #999;
}

.bc-current {
  color: var(--text);
}

/* Catalog layout */
.layout-catalog {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 20px;
  align-items: start;
}

.catalog-sidebar {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
}

.sidebar-title {
  background: linear-gradient(180deg, #e8e8e8 0%, #d8d8d8 100%);
  padding: 10px 12px;
  font-weight: 700;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
  color: var(--red-dark);
}

.sidebar-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-list li {
  border-bottom: 1px solid var(--border);
}

.sidebar-list a {
  display: block;
  padding: 10px 12px;
  color: var(--text);
  font-size: 13px;
}

.sidebar-list a:hover {
  background: #fff;
  color: var(--link);
  text-decoration: none;
}

.catalog-main {
  min-width: 0;
}

.catalog-head {
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.catalog-head h1 {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--red-dark);
}

.catalog-intro {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.product-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.product-cell {
  border: 1px solid var(--border);
  padding: 12px;
  background: #fafafa;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.product-cell:hover {
  border-color: #bbb;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.product-thumb {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  border: 1px solid var(--border);
  background: #f4f4f4;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.product-thumb:hover {
  text-decoration: none;
}

.product-thumb img {
  width: 100%;
  height: 100%;
  max-height: 200px;
  object-fit: contain;
}

.product-ph {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(160deg, #eceff4 0%, #d0d8e4 40%, #b8c4d4 100%);
}

.product-name {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.3;
}

.product-name a {
  color: var(--link);
}

.product-name a:hover {
  color: var(--red);
}

.product-snippet {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.45;
}

/* Intro + contact */
.section-inline {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.section-inline h2 {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--red-dark);
}

.section-inline p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.section-contact-block {
  margin-top: 24px;
  padding: 20px;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
}

.section-contact-block h2 {
  margin: 0 0 16px;
  font-size: 17px;
  color: var(--red-dark);
}

.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  align-items: flex-start;
}

.contact-label {
  margin: 0 0 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.contact-phone {
  font-size: 24px;
  font-weight: 700;
  color: var(--red);
}

.contact-phone:hover {
  text-decoration: none;
  color: var(--red-dark);
}

.contact-zalo-img {
  display: block;
  border: 1px solid var(--border);
  padding: 6px;
  background: var(--bg-white);
  border-radius: 4px;
}

.contact-hint {
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--muted);
}

/* Footer */
.site-footer {
  background: var(--nav-bg);
  color: #aaa;
  padding: 20px 0;
  font-size: 12px;
}

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

.footer-brand {
  margin: 0 0 6px;
  color: #ddd;
}

.footer-brand strong {
  font-size: 14px;
  color: #fff;
}

.footer-copy {
  margin: 0;
}

/* Inquiry assistant */
.iq-toggle {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 1000;
  border: none;
  border-radius: 999px;
  background: var(--red);
  color: #fff;
  font-weight: 700;
  padding: 12px 16px;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
}

.iq-toggle:hover {
  background: var(--red-dark);
}

.iq-panel {
  position: fixed;
  right: 16px;
  bottom: 68px;
  z-index: 1000;
  width: min(360px, calc(100vw - 24px));
  max-height: min(76vh, 620px);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.iq-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f8f8f8;
  border-bottom: 1px solid var(--border);
  padding: 10px 12px;
}

.iq-close {
  border: none;
  background: transparent;
  font-size: 16px;
  cursor: pointer;
  color: #666;
}

.iq-messages {
  padding: 10px;
  overflow-y: auto;
  background: #fcfcfc;
  flex: 1;
}

.iq-msg {
  margin-bottom: 8px;
  display: flex;
}

.iq-msg-user {
  justify-content: flex-end;
}

.iq-msg-bot {
  justify-content: flex-start;
}

.iq-bubble {
  max-width: 88%;
  padding: 8px 10px;
  border-radius: 9px;
  line-height: 1.45;
  font-size: 13px;
  white-space: pre-wrap;
}

.iq-msg-user .iq-bubble {
  background: #e9f3ff;
  border: 1px solid #c9ddf7;
}

.iq-msg-bot .iq-bubble {
  background: #f4f4f4;
  border: 1px solid #ddd;
}

.iq-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 10px 4px;
  border-top: 1px solid #f0f0f0;
}

.iq-chip {
  border: 1px solid #d6d6d6;
  border-radius: 999px;
  background: #fff;
  font-size: 12px;
  padding: 4px 9px;
  cursor: pointer;
}

.iq-chip:hover {
  background: #fafafa;
}

.iq-form {
  display: flex;
  gap: 6px;
  padding: 10px;
  border-top: 1px solid var(--border);
}

.iq-form input {
  flex: 1;
  border: 1px solid #ccc;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 13px;
}

.iq-form button {
  border: none;
  border-radius: 6px;
  background: var(--red);
  color: #fff;
  padding: 8px 12px;
  font-weight: 600;
  cursor: pointer;
}

.iq-actions {
  display: flex;
  gap: 8px;
  padding: 0 10px 10px;
}

.iq-action {
  flex: 1;
  border-radius: 6px;
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.iq-action-ghost {
  border: 1px solid #ccc;
  background: #fff;
  color: #444;
}

.iq-action-primary {
  border: 1px solid var(--red);
  background: #fff3f3;
  color: var(--red-dark);
}

.iq-action:hover {
  filter: brightness(0.98);
}

.iq-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 0 10px 10px;
}

.iq-contact input {
  border: 1px solid #ccc;
  border-radius: 6px;
  padding: 7px 9px;
  font-size: 12px;
}

.iq-admin-tools {
  padding: 0 10px 10px;
}

.iq-admin-tools .iq-action {
  width: 100%;
}

.iq-footnote {
  margin: 0;
  padding: 0 10px 10px;
  font-size: 11px;
  color: var(--muted);
}

/* Responsive */
@media (max-width: 900px) {
  .layout-catalog {
    grid-template-columns: 1fr;
  }

  .catalog-sidebar {
    order: 1;
  }

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

@media (max-width: 520px) {
  .product-grid {
    grid-template-columns: 1fr;
  }

  .header-hotline a {
    font-size: 17px;
  }

  .brand-title {
    font-size: 18px;
  }

  .iq-panel {
    right: 8px;
    bottom: 58px;
    width: calc(100vw - 16px);
  }

  .iq-toggle {
    right: 8px;
    bottom: 8px;
  }
}