/* ============================================================
   common.css — Global Design System
   Tianjin Jingzhou Metal Products Co., Ltd.
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&family=Inter:wght@300;400;500;600;700&display=swap");

/* ---------- CSS Custom Properties ---------- */
:root {
  scrollbar-gutter: stable;
  /* Brand Colors */
  --clr-primary: #1a6dad;
  --clr-primary-dark: #0e4c82;
  --clr-primary-light: #3594ce;
  --clr-accent: #e87014;
  --clr-accent-dark: #c4580b;
  --clr-accent-light: #f58a3a;

  /* Light Palette */
  --clr-bg: #ffffff;
  --clr-bg-2: #e8eff7;
  --clr-bg-3: #dae6f2;
  --clr-surface: #ffffff;
  --clr-surface-2: #e0eaf3;

  /* Text */
  --clr-text: #152433;
  --clr-text-muted: #3a5c7a;
  --clr-text-dim: #688aaa;
  --clr-white: #ffffff;
  --clr-heading: #081018;

  /* Glass (light-mode: white-based frosted) */
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(26, 109, 173, 0.22);
  --glass-blur: blur(18px);
  --glass-shadow:
    0 8px 40px rgba(26, 109, 173, 0.16), 0 1px 0 rgba(26, 109, 173, 0.14) inset;

  /* Typography */
  --font-heading: "Poppins", sans-serif;
  --font-body: "Inter", sans-serif;
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.375rem;
  --fs-xl: 1.75rem;
  --fs-2xl: 2.25rem;
  --fs-3xl: 3rem;
  --fs-4xl: 3.75rem;
  --fs-5xl: 5rem;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;

  /* Layout */
  --max-width: 1600px;
  --page-padding: 2vw;

  /* Transitions */
  --transition-fast: 0.18s ease;
  --transition-base: 0.32s ease;
  --transition-slow: 0.55s cubic-bezier(0.25, 0.46, 0.45, 0.94);

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 12px rgba(26, 109, 173, 0.14);
  --shadow-md: 0 6px 30px rgba(26, 109, 173, 0.2);
  --shadow-lg: 0 16px 60px rgba(26, 109, 173, 0.24);
  --shadow-blue: 0 8px 32px rgba(26, 109, 173, 0.32);
  --shadow-orange: 0 8px 32px rgba(232, 112, 20, 0.4);

  /* Z-index scale */
  --z-base: 1;
  --z-card: 10;
  --z-modal: 100;
  --z-overlay: 90;
  --z-header: 200;
  --z-search: 190;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul,
ol {
  list-style: none;
}

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

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.18;
  color: var(--clr-heading);
}

/* ---------- Layout Container ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--page-padding);
  padding-right: var(--page-padding);
}

/* ---------- Section Spacing ---------- */
.section {
  position: relative;
  padding: var(--space-xl) 0;
  overflow: hidden;
}

/* ---------- Section Labels & Titles ---------- */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  width: fit-content;
  background: rgba(34, 129, 196, 0.08);
  border: 1px solid rgba(34, 129, 196, 0.25);
  border-radius: var(--radius-full);
  color: var(--clr-primary);
  font-family: var(--font-heading);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.35rem 1rem;
  margin-bottom: 1rem;
}

.section-tag i {
  font-size: 0.7rem;
  color: var(--clr-accent);
}

.section-title {
  font-size: clamp(1.8rem, 3vw, var(--fs-3xl));
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  background: linear-gradient(
    135deg,
    var(--clr-heading) 0%,
    var(--clr-primary) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: var(--fs-md);
  color: var(--clr-text-muted);
  font-weight: 400;
  max-width: 620px;
  line-height: 1.7;
}

.section-header {
  margin-bottom: var(--space-xl);
}

.section-header.center {
  text-align: center;
}

.section-header.center .section-subtitle {
  margin: 0 auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--fs-sm);
  letter-spacing: 0.04em;
  border-radius: var(--radius-full);
  padding: 0.75rem 1.8rem;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.08);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::after {
  opacity: 1;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--clr-accent),
    var(--clr-accent-dark)
  );
  color: var(--clr-white);
  box-shadow: var(--shadow-orange);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(244, 126, 32, 0.55);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-outline {
  background: transparent;
  border: 1.5px solid rgba(34, 129, 196, 0.45);
  color: var(--clr-primary);
}

.btn-outline:hover {
  background: rgba(34, 129, 196, 0.08);
  border-color: var(--clr-primary);
  transform: translateY(-2px);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(34, 129, 196, 0.2);
  color: var(--clr-primary-dark);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.85);
  transform: translateY(-2px);
}

.btn-lg {
  font-size: var(--fs-base);
  padding: 1rem 2.4rem;
}

.btn-sm {
  font-size: var(--fs-xs);
  padding: 0.5rem 1.2rem;
}

/* ---------- Glassmorphism Cards ---------- */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(59, 147, 209, 0.4),
    transparent
  );
}

.glass-card-light {
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
}

/* ---------- Parallax Wrapper ---------- */
.parallax-section {
  position: relative;
  overflow: hidden;
}

.parallax-bg {
  position: absolute;
  inset: -15%;
  background-size: cover;
  background-position: center;
  will-change: transform;
  transition: transform 0.1s linear;
}

.parallax-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(6, 14, 26, 0.72) 0%,
    rgba(6, 14, 26, 0.55) 50%,
    rgba(6, 14, 26, 0.82) 100%
  );
  z-index: 1;
}

.parallax-content {
  position: relative;
  z-index: 2;
}

/* ---------- Decorative Elements ---------- */
.deco-grid {
  position: absolute;
  inset: 0;
  /* background-image:
    linear-gradient(rgba(34, 129, 196, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 129, 196, 0.06) 1px, transparent 1px); */
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

.deco-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--clr-accent);
  display: inline-block;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.glow-orb-blue {
  background: radial-gradient(
    circle,
    rgba(34, 129, 196, 0.18) 0%,
    transparent 70%
  );
}

.glow-orb-orange {
  background: radial-gradient(
    circle,
    rgba(244, 126, 32, 0.15) 0%,
    transparent 70%
  );
}

/* ---------- Divider ---------- */
.section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-primary));
  border-radius: var(--radius-full);
  margin: 1rem 0 1.5rem;
}

.section-divider.center {
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Tags / Badges ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(244, 126, 32, 0.1);
  border: 1px solid rgba(244, 126, 32, 0.3);
  color: var(--clr-accent-dark);
  font-size: var(--fs-xs);
  font-weight: 600;
  padding: 0.2rem 0.75rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ---------- Scroll Reveal Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition:
    opacity 0.7s ease,
    transform 0.7s ease;
}

.reveal.reveal-left {
  transform: translateX(-50px);
}

.reveal.reveal-right {
  transform: translateX(50px);
}

.reveal.reveal-scale {
  transform: scale(0.88);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}
@media (max-width: 768px) {
  .reveal.reveal-left,
  .reveal.reveal-right {
    transform: translateY(30px);
  }
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

.stagger-children.visible > *:nth-child(1) {
  transition-delay: 0.05s;
}
.stagger-children.visible > *:nth-child(2) {
  transition-delay: 0.13s;
}
.stagger-children.visible > *:nth-child(3) {
  transition-delay: 0.21s;
}
.stagger-children.visible > *:nth-child(4) {
  transition-delay: 0.29s;
}
.stagger-children.visible > *:nth-child(5) {
  transition-delay: 0.37s;
}
.stagger-children.visible > *:nth-child(6) {
  transition-delay: 0.45s;
}

.stagger-children.visible > * {
  opacity: 1;
  transform: none;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--clr-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--clr-primary-dark);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--clr-primary);
}

/* ---------- Selection ---------- */
::selection {
  background: rgba(34, 129, 196, 0.25);
  color: var(--clr-heading);
}

/* ---------- Responsive Breakpoints ---------- */
/* Desktop-first. Breakpoints: tablet ≤1024px, mobile ≤768px */

@media (max-width: 1200px) {
  :root {
    --fs-5xl: 4rem;
    --fs-4xl: 3rem;
  }
}

@media (max-width: 1024px) {
  :root {
    --space-3xl: 5rem;
    --space-2xl: 4rem;
  }
}

@media (max-width: 768px) {
  :root {
    --space-3xl: 4rem;
    --space-2xl: 3rem;
    --space-xl: 2.5rem;
    --page-padding: 4vw;
  }
  .page-banner::before,
  .news-detail-banner,
  .news-detail-banner::after {
    background-attachment: scroll !important;
  }
}

@media (max-width: 480px) {
  :root {
    --page-padding: 5vw;
  }
}

/* ============================================================
   Common Components for Pages
   ============================================================ */

/* ---------- Breadcrumbs ---------- */
.breadcrumb-nav {
  padding: 1.5rem 0;
  border-bottom: 1px solid rgba(34, 129, 196, 0.1);
  background: var(--clr-bg);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb-item a {
  color: var(--clr-text-muted);
  transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
  color: var(--clr-primary);
}

.breadcrumb-item.active {
  color: var(--clr-primary-dark);
  font-weight: 600;
}

.breadcrumb-separator {
  font-size: 0.7rem;
  opacity: 0.5;
}

/* ---------- Products Sidebar ---------- */
.products-sidebar-container {
  position: sticky;
  top: 100px; /* Adjust based on header height */
  height: max-content;
}

.sidebar-category-card {
  background: var(--clr-white);
  border: 1px solid rgba(34, 129, 196, 0.12);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.sidebar-title-small {
  font-size: var(--fs-md);
  font-weight: 700;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--clr-bg-2);
}

.sidebar-menu-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sidebar-menu-item {
  position: relative;
}

.sidebar-link-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: var(--radius-sm);
  background: rgba(34, 129, 196, 0.03);
  transition: all var(--transition-fast);
  overflow: hidden;
}

.sidebar-menu-item a {
  flex: 1;
  padding: 0.75rem 1rem;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-text);
  transition: all var(--transition-fast);
  background: transparent;
}

.sidebar-menu-item a:hover {
  color: var(--clr-primary);
}

.sidebar-menu-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--clr-text-muted);
  border-left: 1px solid rgba(34, 129, 196, 0.1);
  transition: all var(--transition-fast);
}

.sidebar-menu-toggle:hover {
  background: rgba(34, 129, 196, 0.08);
  color: var(--clr-primary);
}

.sidebar-menu-item.active > .sidebar-link-wrap {
  background: var(--clr-primary);
}

.sidebar-menu-item.active > .sidebar-link-wrap a {
  color: var(--clr-white);
}

.sidebar-menu-item.active > .sidebar-link-wrap .sidebar-menu-toggle {
  color: var(--clr-white);
  border-left-color: rgba(255, 255, 255, 0.2);
}
.sidebar-link-wrap .sidebar-menu-toggle i {
  transition: all 0.3s ease;
}
.sidebar-menu-item.expanded > .sidebar-link-wrap .sidebar-menu-toggle i {
  transform: rotate(180deg);
}

/* Submenu */
.sidebar-submenu {
  max-height: 0;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.sidebar-menu-item.expanded .sidebar-submenu {
  max-height: 500px;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.submenu-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.825rem;
  color: var(--clr-text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.submenu-link::before {
  content: "—";
  opacity: 0.6;
  font-weight: 400;
}

.submenu-link:hover {
  color: var(--clr-primary);
  background: rgba(34, 129, 196, 0.05);
  transform: translateX(4px);
}

.submenu-link.active {
  color: var(--clr-primary);
  font-weight: 600;
}

.sidebar-menu-item .count {
  font-size: 0.75rem;
  opacity: 0.7;
}

/* ---------- Pagination ---------- */
.pagination-wrap {
  margin-top: var(--space-xl);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
}

.pagination-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 42px;
  padding: 0 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--clr-white);
  border: 1px solid rgba(34, 129, 196, 0.15);
  color: var(--clr-text);
  font-weight: 600;
  font-size: var(--fs-sm);
  transition: all var(--transition-fast);
}

.pagination-btn:hover:not(.disabled) {
  border-color: var(--clr-primary);
  color: var(--clr-primary);
  background: rgba(34, 129, 196, 0.05);
  transform: translateY(-2px);
}

.pagination-btn.active {
  background: var(--clr-primary);
  border-color: var(--clr-primary);
  color: var(--clr-white);
  box-shadow: var(--shadow-sm);
}

.pagination-btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: var(--clr-bg-2);
}

/* ---------- FAQ Accordion ---------- */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  /* max-width: 900px;
  margin: 0 auto; */
}

.faq-item {
  border: 1px solid rgba(34, 129, 196, 0.12);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--clr-white);
  transition: all var(--transition-base);
}

.faq-item.active {
  border-color: var(--clr-primary);
  box-shadow: var(--shadow-sm);
}

.faq-header {
  width: 100%;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  text-align: left;
  background: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.faq-header:hover {
  background: rgba(34, 129, 196, 0.03);
}

.faq-question {
  font-size: var(--fs-base);
  font-weight: 600;
  color: var(--clr-heading);
  margin: 0;
}

.faq-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(34, 129, 196, 0.08);
  color: var(--clr-primary);
  transition: all var(--transition-base);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  background: var(--clr-primary);
  color: var(--clr-white);
  transform: rotate(180deg);
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-item.active .faq-body {
  max-height: 1000px; /* Large enough to fit content */
}

.faq-content {
  padding: 0 1.5rem 1.5rem;
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  line-height: 1.7;
}

/* CTA Sidebar Card */
.sidebar-cta-card {
  margin-top: 2rem;
  background: linear-gradient(
    135deg,
    var(--clr-primary-dark),
    var(--clr-primary)
  );
  color: var(--clr-white);
  padding: 2rem;
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-blue);
}

.sidebar-cta-card h3 {
  color: var(--clr-white);
  font-size: var(--fs-md);
  margin-bottom: 1rem;
}

.sidebar-cta-card p {
  font-size: var(--fs-xs);
  margin-bottom: 1.5rem;
  opacity: 0.9;
}
/* ---------- Sticky Tabs ---------- */
.sticky-tabs-wrap {
  position: sticky;
  top: 80px; /* Adjust based on header height */
  z-index: 50;
  background: var(--clr-white);
  border-bottom: 1px solid rgba(34, 129, 196, 0.1);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
}
.sticky-tabs-wrap .container {
  padding: 0;
}
.sticky-tabs-list {
  display: flex;
  gap: 2rem;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.sticky-tabs-list::-webkit-scrollbar {
  display: none;
}

.sticky-tab-btn {
  padding: 1.25rem 0;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-text-muted);
  border-bottom: 3px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.sticky-tab-btn:hover {
  color: var(--clr-primary);
}

.sticky-tab-btn.active {
  color: var(--clr-primary);
  border-bottom-color: var(--clr-primary);
}