/* ==========================================================================
   濟宏泰度量衡器科技有限公司 - 官方網站 Core CSS Stylesheet
   CI 視覺標準：黑 / 紅 / 暖白 / 機械灰 + 刻度線 + 零點紅點
   ========================================================================== */

:root {
  /* CI Color Tokens */
  --color-jht-red: #B6312C;
  --color-jht-red-hover: #9E2622;
  --color-jht-red-light: rgba(182, 49, 44, 0.08);
  
  --color-instrument-black: #202326;
  --color-black-card: #181B1D;
  --color-black-light: #2A2E33;
  
  --color-mechanical-gray: #72777C;
  --color-gray-light: #E2E4E6;
  --color-gray-border: #D1D5DB;
  
  --color-industrial-white: #F4F3EF;
  --color-pure-white: #FFFFFF;
  
  /* Typography */
  --font-family-base: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: 'IBM Plex Mono', 'DIN Alternate', 'Consolas', monospace;
  
  /* Spacing & Structure */
  --header-height: 80px;
  --container-max-width: 1240px;
  --radius-sm: 2px;
  --radius-md: 4px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* Reset & Global Base Settings */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--color-industrial-white);
  color: var(--color-instrument-black);
}

body {
  font-family: var(--font-family-base);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ==========================================================================
   CI Signature Components: Ruler Scale & Zero Point
   ========================================================================== */

/* Scale Ruler Horizontal Section Divider */
.scale-ruler-divider {
  width: 100%;
  height: 28px;
  position: relative;
  background-color: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 2rem 0;
}

.scale-ruler-track {
  width: 100%;
  height: 1px;
  background-color: var(--color-mechanical-gray);
  position: absolute;
  top: 50%;
  left: 0;
  opacity: 0.4;
}

.scale-ruler-ticks {
  width: 100%;
  height: 16px;
  position: absolute;
  top: 6px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-mechanical-gray) 0,
    var(--color-mechanical-gray) 1px,
    transparent 1px,
    transparent 10px
  );
  opacity: 0.3;
}

.scale-ruler-zero-point {
  width: 12px;
  height: 12px;
  background-color: var(--color-jht-red);
  border-radius: 50%;
  position: relative;
  z-index: 2;
  box-shadow: 0 0 0 3px var(--color-industrial-white), 0 0 8px rgba(182, 49, 44, 0.4);
}

.scale-ruler-zero-point::before {
  content: '';
  position: absolute;
  top: -4px;
  left: 5px;
  width: 2px;
  height: 20px;
  background-color: var(--color-jht-red);
}

/* Red Zero Point Dot Pulse Animation */
.zero-point-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-jht-red);
  border-radius: 50%;
  position: relative;
  margin-right: 8px;
  vertical-align: middle;
}

.zero-point-dot.pulse::after {
  content: '';
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  bottom: -3px;
  border: 1px solid var(--color-jht-red);
  border-radius: 50%;
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

/* Technical Monospace Values */
.tech-value {
  font-family: var(--font-family-mono);
  font-weight: 700;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Header & Navigation Bar
   ========================================================================== */

/* Top Status Announcement Bar */
.top-bar {
  background-color: var(--color-instrument-black);
  color: var(--color-gray-light);
  font-size: 0.8125rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.top-bar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-bar-info {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.top-bar-info span {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.top-bar-meta {
  display: flex;
  gap: 1rem;
}

.top-bar-meta a:hover {
  color: var(--color-jht-red);
}

/* Main Header */
.main-header {
  height: var(--header-height);
  background-color: rgba(244, 243, 239, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--color-gray-border);
}

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

/* Brand Logo Styling */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
}

.logo-graphic-box {
  display: flex;
  align-items: center;
}

.logo-text-group {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--color-instrument-black);
  letter-spacing: 0.15em;
  line-height: 1.1;
}

.brand-subtitle-line {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.7rem;
  color: var(--color-mechanical-gray);
  letter-spacing: 0.2em;
  margin-top: 2px;
}

.brand-subtitle-line::before,
.brand-subtitle-line::after {
  content: '';
  flex: 1;
  height: 1px;
  background-color: var(--color-jht-red);
}

/* Navigation Links */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-instrument-black);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-jht-red);
  transition: all var(--transition-fast);
  transform: translateX(-50%);
}

.nav-link:hover {
  color: var(--color-jht-red);
}

.nav-link:hover::after {
  width: 100%;
}

/* Header Buttons & CTA */
.btn-cta-primary {
  background-color: var(--color-jht-red);
  color: var(--color-pure-white);
  padding: 0.65rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 6px rgba(182, 49, 44, 0.25);
}

.btn-cta-primary:hover {
  background-color: var(--color-jht-red-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(182, 49, 44, 0.35);
}

.btn-outline-dark {
  border: 1px solid var(--color-instrument-black);
  color: var(--color-instrument-black);
  padding: 0.65rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.btn-outline-dark:hover {
  background-color: var(--color-instrument-black);
  color: var(--color-pure-white);
}

.mobile-menu-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--color-instrument-black);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
  padding: 4.5rem 0 3.5rem 0;
  position: relative;
  overflow: hidden;
  background-color: var(--color-industrial-white);
}

.hero-bg-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: 40px 40px;
  background-image: 
    linear-gradient(to right, rgba(114, 119, 124, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(114, 119, 124, 0.05) 1px, transparent 1px);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.85rem;
  background-color: var(--color-pure-white);
  border: 1px solid var(--color-gray-border);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-instrument-black);
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
  border-left: 3px solid var(--color-jht-red);
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.15;
  color: var(--color-instrument-black);
  letter-spacing: 0.02em;
  margin-bottom: 1.2rem;
}

.hero-title span.highlight-red {
  color: var(--color-jht-red);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-mechanical-gray);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

/* Digital Scale Console Box (Hero Right) */
.scale-console-box {
  background-color: var(--color-black-card);
  border: 2px solid var(--color-instrument-black);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  color: var(--color-pure-white);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.25);
  position: relative;
}

.console-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 0.8rem;
  margin-bottom: 1.2rem;
}

.console-brand-label {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--color-gray-light);
  font-weight: 700;
}

.console-status-badge {
  font-size: 0.75rem;
  color: #10B981;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.status-dot-green {
  width: 6px;
  height: 6px;
  background-color: #10B981;
  border-radius: 50%;
  box-shadow: 0 0 6px #10B981;
}

/* Industrial LED LCD Display Screen */
.digital-display-screen {
  background-color: #0F1214;
  border: 2px solid #2B3036;
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  text-align: right;
  margin-bottom: 1.2rem;
  position: relative;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.8);
}

.screen-unit-label {
  position: absolute;
  top: 0.8rem;
  left: 1rem;
  font-family: var(--font-family-mono);
  font-size: 0.75rem;
  color: var(--color-mechanical-gray);
  letter-spacing: 0.1em;
}

.digital-weight-value {
  font-family: var(--font-family-mono);
  font-size: 3.5rem;
  font-weight: 700;
  color: #F87171;
  letter-spacing: 0.05em;
  text-shadow: 0 0 10px rgba(248, 113, 113, 0.4);
}

.screen-sub-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-family-mono);
  font-size: 0.75rem;
  color: #9CA3AF;
  margin-top: 0.5rem;
}

/* Console Control Buttons */
.console-controls {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
}

.console-btn {
  background-color: #262B30;
  border: 1px solid #3A4048;
  color: var(--color-gray-light);
  font-family: var(--font-family-mono);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.6rem 0.2rem;
  border-radius: 2px;
  text-align: center;
  transition: all var(--transition-fast);
}

.console-btn:hover {
  background-color: #353C44;
  color: var(--color-pure-white);
  border-color: var(--color-jht-red);
}

.console-btn.active {
  background-color: var(--color-jht-red);
  border-color: var(--color-jht-red);
  color: var(--color-pure-white);
}

/* ==========================================================================
   Section Title & Architecture
   ========================================================================== */

.section-padding {
  padding: 5rem 0;
}

.section-header {
  margin-bottom: 3.5rem;
  position: relative;
}

.section-subtitle {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-jht-red);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--color-instrument-black);
  letter-spacing: 0.02em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-mechanical-gray);
  margin-top: 0.8rem;
  max-width: 680px;
}

/* ==========================================================================
   Capabilities Section (四大核心能力)
   ========================================================================== */

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.capability-card {
  background-color: var(--color-pure-white);
  border: 1px solid var(--color-gray-border);
  padding: 2rem 1.5rem;
  position: relative;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.capability-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--color-instrument-black);
  transition: background-color var(--transition-fast);
}

.capability-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.capability-card:hover::before {
  background-color: var(--color-jht-red);
}

.capability-num {
  font-family: var(--font-family-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-jht-red);
  margin-bottom: 1rem;
}

.capability-icon {
  font-size: 2.2rem;
  color: var(--color-instrument-black);
  margin-bottom: 1.2rem;
}

.capability-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 0.8rem;
  color: var(--color-instrument-black);
}

.capability-desc {
  font-size: 0.92rem;
  color: var(--color-mechanical-gray);
  line-height: 1.6;
  flex-grow: 1;
}

.capability-list {
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--color-gray-border);
}

.capability-list li {
  font-size: 0.85rem;
  color: var(--color-instrument-black);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* ==========================================================================
   Product Showcase Section (產品與感測器展櫃)
   ========================================================================== */

.product-section {
  background-color: #ECEAE4;
}

.filter-tabs-wrapper {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.filter-tab-btn {
  background-color: var(--color-pure-white);
  border: 1px solid var(--color-gray-border);
  padding: 0.6rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-instrument-black);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-tab-btn:hover,
.filter-tab-btn.active {
  background-color: var(--color-instrument-black);
  color: var(--color-pure-white);
  border-color: var(--color-instrument-black);
}

.filter-tab-btn.active .tab-dot {
  background-color: var(--color-jht-red);
}

.tab-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-mechanical-gray);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.product-card {
  background-color: var(--color-pure-white);
  border: 1px solid var(--color-gray-border);
  overflow: hidden;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
  border-color: var(--color-instrument-black);
}

.product-img-wrapper {
  height: 200px;
  background-color: #F8F7F4;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--color-gray-border);
  padding: 1.5rem;
}

.product-badge {
  position: absolute;
  top: 0.8rem;
  right: 0.8rem;
  background-color: var(--color-instrument-black);
  color: var(--color-pure-white);
  font-family: var(--font-family-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  letter-spacing: 0.05em;
}

.product-img-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-mechanical-gray);
}

.product-img-placeholder i {
  font-size: 3rem;
  color: var(--color-instrument-black);
}

.product-info {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.product-model {
  font-family: var(--font-family-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-jht-red);
  letter-spacing: 0.05em;
  margin-bottom: 0.3rem;
}

.product-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-instrument-black);
  margin-bottom: 0.6rem;
}

.product-summary {
  font-size: 0.9rem;
  color: var(--color-mechanical-gray);
  line-height: 1.5;
  margin-bottom: 1.2rem;
  flex-grow: 1;
}

.product-spec-preview {
  background-color: #F8F7F4;
  border: 1px solid #EAE8E2;
  padding: 0.8rem;
  font-size: 0.8rem;
  margin-bottom: 1.2rem;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.3rem;
}

.spec-row:last-child {
  margin-bottom: 0;
}

.spec-label {
  color: var(--color-mechanical-gray);
}

.spec-val {
  font-family: var(--font-family-mono);
  font-weight: 700;
  color: var(--color-instrument-black);
}

.product-card-footer {
  display: flex;
  gap: 0.5rem;
}

.btn-card-action {
  flex: 1;
  padding: 0.55rem;
  font-size: 0.85rem;
  font-weight: 700;
  text-align: center;
  border: 1px solid var(--color-instrument-black);
  transition: all var(--transition-fast);
}

.btn-card-action.secondary {
  background-color: transparent;
  color: var(--color-instrument-black);
}

.btn-card-action.secondary:hover {
  background-color: var(--color-gray-light);
}

.btn-card-action.primary {
  background-color: var(--color-instrument-black);
  color: var(--color-pure-white);
}

.btn-card-action.primary:hover {
  background-color: var(--color-jht-red);
  border-color: var(--color-jht-red);
}

/* ==========================================================================
   Systems Integration Section (系統整合專區)
   ========================================================================== */

.systems-section {
  background-color: var(--color-instrument-black);
  color: var(--color-pure-white);
  position: relative;
  overflow: hidden;
}

.systems-section .section-title {
  color: var(--color-pure-white);
}

.systems-section .section-desc {
  color: var(--color-gray-light);
}

.systems-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.system-card {
  background-color: var(--color-black-card);
  border: 1px solid #33383E;
  padding: 2.2rem;
  position: relative;
  transition: all var(--transition-normal);
}

.system-card:hover {
  border-color: var(--color-jht-red);
  transform: translateY(-3px);
}

.system-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.2rem;
}

.system-icon-box {
  width: 50px;
  height: 50px;
  background-color: rgba(182, 49, 44, 0.15);
  border: 1px solid var(--color-jht-red);
  color: var(--color-jht-red);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.system-tag {
  font-family: var(--font-family-mono);
  font-size: 0.75rem;
  color: var(--color-mechanical-gray);
  letter-spacing: 0.1em;
}

.system-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-pure-white);
  margin-bottom: 0.8rem;
}

.system-desc {
  font-size: 0.95rem;
  color: var(--color-gray-light);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.system-highlights {
  background-color: #0F1214;
  border-left: 3px solid var(--color-jht-red);
  padding: 1rem;
}

.system-highlights li {
  font-size: 0.85rem;
  color: #D1D5DB;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.system-highlights li:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Engineering Process Timeline (5 步工程服務流程)
   ========================================================================== */

.process-timeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  position: relative;
  margin-top: 2rem;
}

.process-step-card {
  background-color: var(--color-pure-white);
  border: 1px solid var(--color-gray-border);
  padding: 1.5rem 1.2rem;
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.process-step-card::after {
  content: '';
  position: absolute;
  top: 50%;
  right: -10px;
  width: 0;
  height: 0;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 8px solid var(--color-mechanical-gray);
  transform: translateY(-50%);
  z-index: 2;
}

.process-step-card:last-child::after {
  display: none;
}

.step-number {
  font-family: var(--font-family-mono);
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--color-jht-red);
  line-height: 1;
  margin-bottom: 0.8rem;
}

.step-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-instrument-black);
  margin-bottom: 0.5rem;
}

.step-desc {
  font-size: 0.85rem;
  color: var(--color-mechanical-gray);
  line-height: 1.5;
}

/* ==========================================================================
   Brand Heritage Section (品牌沿革)
   ========================================================================== */

.heritage-section {
  background-color: var(--color-pure-white);
  border-top: 1px solid var(--color-gray-border);
  border-bottom: 1px solid var(--color-gray-border);
}

.heritage-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.heritage-quote-box {
  background-color: var(--color-industrial-white);
  border-left: 4px solid var(--color-jht-red);
  padding: 2rem;
  margin-top: 1.5rem;
}

.heritage-quote {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-instrument-black);
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.heritage-subtext {
  font-size: 0.9rem;
  color: var(--color-mechanical-gray);
}

.heritage-timeline {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
  position: relative;
  padding-left: 2rem;
}

.heritage-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 7px;
  width: 2px;
  background-color: var(--color-gray-border);
}

.timeline-item {
  position: relative;
}

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 0.3rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-pure-white);
  border: 3px solid var(--color-instrument-black);
}

.timeline-item.active .timeline-dot {
  border-color: var(--color-jht-red);
  background-color: var(--color-jht-red);
}

.timeline-era {
  font-family: var(--font-family-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-jht-red);
  letter-spacing: 0.05em;
}

.timeline-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-instrument-black);
  margin: 0.2rem 0;
}

.timeline-detail {
  font-size: 0.9rem;
  color: var(--color-mechanical-gray);
}

/* ==========================================================================
   Inquiry & Contact Form Section (線上需求評估與諮詢)
   ========================================================================== */

.inquiry-section {
  background-color: #ECEAE4;
}

.inquiry-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 3rem;
  background-color: var(--color-pure-white);
  border: 1px solid var(--color-gray-border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.inquiry-info-pane {
  background-color: var(--color-instrument-black);
  color: var(--color-pure-white);
  padding: 3rem 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.inquiry-info-pane h3 {
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 1rem;
}

.inquiry-contact-list {
  margin: 2rem 0;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-icon {
  width: 36px;
  height: 36px;
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-jht-red);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-label {
  font-size: 0.75rem;
  color: var(--color-mechanical-gray);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.contact-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-pure-white);
}

.inquiry-form-pane {
  padding: 3rem 2.5rem;
}

.form-group-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin-bottom: 1.2rem;
}

.form-field {
  margin-bottom: 1.2rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-instrument-black);
  margin-bottom: 0.4rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.92rem;
  border: 1px solid var(--color-gray-border);
  background-color: var(--color-industrial-white);
  color: var(--color-instrument-black);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-jht-red);
  background-color: var(--color-pure-white);
}

/* Dynamic Inquiry Item Cart Badge */
.cart-items-preview {
  background-color: var(--color-industrial-white);
  border: 1px dashed var(--color-gray-border);
  padding: 0.8rem;
  margin-bottom: 1.2rem;
  border-radius: var(--radius-sm);
}

.cart-items-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-mechanical-gray);
  margin-bottom: 0.5rem;
}

.cart-items-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.cart-tag {
  background-color: var(--color-instrument-black);
  color: var(--color-pure-white);
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.cart-tag i {
  cursor: pointer;
}

/* ==========================================================================
   Footer Section
   ========================================================================== */

.main-footer {
  background-color: var(--color-instrument-black);
  color: var(--color-gray-light);
  padding-top: 4rem;
  padding-bottom: 2rem;
  border-top: 3px solid var(--color-jht-red);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: var(--color-mechanical-gray);
  margin-top: 1rem;
  line-height: 1.6;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-pure-white);
  margin-bottom: 1.2rem;
  letter-spacing: 0.05em;
}

.footer-links li {
  margin-bottom: 0.6rem;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--color-mechanical-gray);
}

.footer-links a:hover {
  color: var(--color-jht-red);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--color-mechanical-gray);
}

/* Modal Popup Dialog */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-container {
  background-color: var(--color-pure-white);
  border: 2px solid var(--color-instrument-black);
  max-width: 680px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 2rem;
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.modal-close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  color: var(--color-mechanical-gray);
}

.modal-close-btn:hover {
  color: var(--color-jht-red);
}

/* ==========================================================================
   Responsive Media Queries
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .capabilities-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .process-timeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-step-card::after {
    display: none;
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .hero-title {
    font-size: 2.3rem;
  }
  
  .capabilities-grid,
  .products-grid,
  .systems-grid,
  .process-timeline,
  .heritage-grid,
  .inquiry-wrapper {
    grid-template-columns: 1fr;
  }
  
  .form-group-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
}