/* =====================================================
   MARUSOFT REDESIGN - style.css
   철도·교통 시스템 소프트웨어 전문기업
   슈어포인트 UI 벤치마킹 | 최신 웹 표준 적용
   ===================================================== */

/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
  /* Brand Colors - 철도·교통 전문기업 (네이비 + 오렌지 골드) */
  --color-primary: #1a3a6b;        /* 딥 네이비 (신뢰·전문성) */
  --color-primary-dark: #122a52;
  --color-primary-light: #2455a0;
  --color-primary-alpha: rgba(26, 58, 107, 0.1);
  --color-accent: #e8a020;         /* 오렌지 골드 (회사소개서 강조색) */
  --color-accent-light: #f0b840;
  --color-accent-alpha: rgba(232, 160, 32, 0.15);
  --color-teal: #0d9488;
  --color-success: #10b981;
  --color-error: #ef4444;

  /* Neutrals */
  --color-dark: #0a0f1e;
  --color-dark-2: #0f1628;
  --color-dark-3: #1a2035;
  --color-dark-4: #232b42;
  --color-gray-1: #374151;
  --color-gray-2: #6b7280;
  --color-gray-3: #9ca3af;
  --color-gray-4: #d1d5db;
  --color-gray-5: #e5e7eb;
  --color-gray-6: #f3f4f6;
  --color-white: #ffffff;
  --color-text: #111827;
  --color-text-secondary: #4b5563;

  /* Typography */
  --font-sans: 'Noto Sans KR', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Layout */
  --max-width: 1280px;
  --header-height: 80px;
  --section-padding: clamp(4rem, 8vw, 8rem);

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 40px rgba(26, 58, 107, 0.3);
  --shadow-glow-accent: 0 0 30px rgba(232, 160, 32, 0.3);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition-fast); }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ===== UTILITY ===== */
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 4vw, 4rem);
}
.section-header { text-align: center; margin-bottom: clamp(2.5rem, 5vw, 4rem); }

.section-tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  padding: 0.35rem 0.9rem;
  background: var(--color-accent-alpha);
  border: 1px solid rgba(232,160,32,0.25);
  border-radius: var(--radius-full);
}
.section-tag-light {
  color: rgba(255,255,255,0.7);
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.15);
}

.section-title {
  font-size: clamp(1.875rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-text);
  letter-spacing: -0.025em;
  margin-bottom: 1rem;
}
.section-title-light { color: var(--color-white); }
.section-desc {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--color-text-secondary);
  line-height: 1.75;
  max-width: 600px;
  margin: 0 auto;
}
.br-pc { display: inline; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem; font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap; cursor: pointer;
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
  color: var(--color-white);
}
.btn-ghost {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.35);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.65);
  color: var(--color-white);
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary); color: var(--color-white); }
.btn-lg { padding: 1rem 2rem; font-size: 1rem; }
.btn-full { width: 100%; }

/* ===== HEADER ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-height);
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.07);
  transition: all var(--transition-base);
}
.site-header.scrolled { box-shadow: var(--shadow-md); }
.header-inner {
  max-width: var(--max-width); margin: 0 auto;
  padding: 0 clamp(1.5rem, 4vw, 4rem);
  height: 100%;
  display: flex; align-items: center; gap: 2rem;
}

/* Logo */
.logo { display: flex; align-items: center; gap: 0.625rem; flex-shrink: 0; }
.logo-img {
  height: 40px;
  width: auto;
  display: block;
  object-fit: contain;
}
.logo-img-footer {
  height: 36px;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: 0.9;
}
.logo-mark {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(26,58,107,0.3);
}
.logo-text-wrap { display: flex; flex-direction: column; line-height: 1.1; }
.logo-text { font-size: 1rem; font-weight: 800; letter-spacing: 0.08em; color: var(--color-primary); }
.logo-sub { font-size: 0.625rem; font-weight: 500; letter-spacing: 0.06em; color: var(--color-gray-2); }

.main-nav { flex: 1; display: flex; justify-content: center; }
.nav-list { display: flex; align-items: center; gap: 0.125rem; }
.nav-link {
  padding: 0.5rem 0.875rem;
  font-size: 0.875rem; font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
  background: var(--color-primary-alpha);
}
.header-cta { flex-shrink: 0; }

.hamburger { display: none; flex-direction: column; gap: 5px; padding: 0.5rem; margin-left: auto; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--color-text); border-radius: 2px; transition: all var(--transition-base); }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none; position: fixed;
  top: var(--header-height); left: 0; right: 0;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-5);
  padding: 1rem; box-shadow: var(--shadow-lg);
  transform: translateY(-100%); opacity: 0;
  transition: all var(--transition-base); z-index: 999;
}
.mobile-menu.open { transform: translateY(0); opacity: 1; }
.mobile-nav-list { display: flex; flex-direction: column; gap: 0.25rem; }
.mobile-nav-link {
  display: block; padding: 0.875rem 1rem;
  font-size: 1rem; font-weight: 500; color: var(--color-text);
  border-radius: var(--radius-sm); transition: all var(--transition-fast);
}
.mobile-nav-link:hover { background: var(--color-gray-6); color: var(--color-primary); }
.mobile-cta { background: var(--color-primary); color: var(--color-white) !important; text-align: center; margin-top: 0.5rem; }
.mobile-cta:hover { background: var(--color-primary-dark) !important; }

/* ===== HERO SECTION ===== */
.hero-section {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; padding-top: var(--header-height);
  background: var(--color-dark);
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-gradient {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -5%, rgba(26,58,107,0.6) 0%, transparent 65%),
    radial-gradient(ellipse 50% 40% at 85% 75%, rgba(232,160,32,0.12) 0%, transparent 55%),
    linear-gradient(180deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
}
.hero-grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 80%);
}

/* 철도 트랙 라인 장식 */
.hero-track-lines { position: absolute; inset: 0; overflow: hidden; }
.track-line {
  position: absolute; width: 100%; height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(232,160,32,0.2) 20%, rgba(232,160,32,0.4) 50%, rgba(232,160,32,0.2) 80%, transparent 100%);
}
.track-line-1 { top: 35%; animation: track-move 8s linear infinite; }
.track-line-2 { top: 65%; animation: track-move 8s linear infinite 4s; }
@keyframes track-move {
  0% { transform: translateX(-100%); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateX(100%); opacity: 0; }
}

.hero-content {
  position: relative; z-index: 1;
  text-align: center;
  padding: clamp(2rem, 5vw, 5rem) clamp(1.5rem, 4vw, 4rem);
  max-width: 960px; width: 100%;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: rgba(232,160,32,0.12);
  border: 1px solid rgba(232,160,32,0.3);
  border-radius: var(--radius-full);
  color: rgba(255,255,255,0.8);
  font-size: 0.8125rem; font-weight: 500;
  margin-bottom: 1.75rem; letter-spacing: 0.02em;
}
.badge-dot {
  width: 7px; height: 7px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.8); }
}

.hero-title {
  display: flex; flex-direction: column;
  font-size: clamp(2.25rem, 6.5vw, 5rem);
  font-weight: 800; line-height: 1.1;
  letter-spacing: -0.03em; color: var(--color-white);
  margin-bottom: 1.5rem;
}
.hero-title-line { display: block; }
.hero-title-accent {
  background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero-desc {
  font-size: clamp(1rem, 1.8vw, 1.1875rem);
  font-weight: 300; color: rgba(255,255,255,0.6);
  line-height: 1.8; margin-bottom: 2.5rem; word-break: keep-all;
}
.hero-actions {
  display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-bottom: 4rem;
}

.hero-stats {
  display: flex; align-items: center; justify-content: center;
  flex-wrap: wrap;
  padding: 1.5rem 2rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(8px);
}
.stat-item { display: flex; flex-direction: column; align-items: center; padding: 0.5rem 2rem; }
.stat-number {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800; color: var(--color-white);
  line-height: 1; letter-spacing: -0.02em;
}
.stat-unit { font-size: 0.9375rem; font-weight: 600; color: var(--color-accent); }
.stat-label { font-size: 0.6875rem; font-weight: 400; color: rgba(255,255,255,0.45); margin-top: 0.25rem; letter-spacing: 0.05em; }
.stat-divider { width: 1px; height: 40px; background: rgba(255,255,255,0.12); }

.hero-scroll-indicator {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem; z-index: 1;
}
.scroll-line {
  width: 1px; height: 40px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.5), transparent);
  animation: scroll-line 2s ease-in-out infinite;
}
@keyframes scroll-line {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}
.scroll-text { font-size: 0.625rem; letter-spacing: 0.2em; color: rgba(255,255,255,0.35); font-weight: 600; }

/* ===== BUSINESS SECTION (슈어포인트 인터랙티브 카드) ===== */
.business-section { padding: var(--section-padding) 0; background: var(--color-dark); }
.business-section .section-header .section-title { color: var(--color-white); }
.business-section .section-header .section-desc { color: rgba(255,255,255,0.5); }

.service-cards {
  display: flex; height: 520px;
  border-radius: var(--radius-xl); overflow: hidden; gap: 3px;
}
.service-card {
  position: relative; flex: 1; overflow: hidden; cursor: pointer;
  transition: flex var(--transition-slow); min-width: 0;
}
.service-cards:hover .service-card { flex: 0.5; }
.service-cards:hover .service-card:hover { flex: 3; }

.service-card-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  transition: transform var(--transition-slow), filter var(--transition-slow);
  filter: brightness(0.3) saturate(0.6);
}
.service-card:hover .service-card-bg { transform: scale(1.06); filter: brightness(0.5) saturate(0.85); }

.service-card-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(10,15,30,0.97) 0%, rgba(10,15,30,0.5) 50%, rgba(10,15,30,0.1) 100%);
  transition: background var(--transition-base);
}
.service-card:hover .service-card-overlay {
  background: linear-gradient(to top, rgba(10,15,30,0.92) 0%, rgba(10,15,30,0.3) 60%, rgba(10,15,30,0.05) 100%);
}

.service-card-content { position: absolute; bottom: 0; left: 0; right: 0; padding: 2rem 1.75rem; color: var(--color-white); }
.service-icon {
  width: 52px; height: 52px;
  background: rgba(232,160,32,0.15);
  border: 1px solid rgba(232,160,32,0.3);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-accent); margin-bottom: 1rem;
  transition: all var(--transition-base);
}
.service-card:hover .service-icon { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-dark); }

.service-card-title {
  font-size: clamp(0.9375rem, 1.4vw, 1.25rem); font-weight: 600; color: var(--color-white);
  margin-bottom: 0.375rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  transition: font-size var(--transition-base);
}
.service-card:hover .service-card-title { font-size: clamp(1.125rem, 1.6vw, 1.5rem); white-space: normal; }
.service-card-sub { font-size: 0.8125rem; font-weight: 300; color: rgba(255,255,255,0.5); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.service-card:hover .service-card-sub { white-space: normal; }

.service-card-detail {
  max-height: 0; overflow: hidden; opacity: 0;
  transition: max-height 0.55s cubic-bezier(0.4,0,0.2,1), opacity 0.4s ease 0.1s, margin 0.4s ease;
  margin-top: 0;
}
.service-card:hover .service-card-detail { max-height: 300px; opacity: 1; margin-top: 1.25rem; }

.service-bullets { margin-bottom: 1.25rem; }
.service-bullets li {
  font-size: 0.8125rem; font-weight: 300; color: rgba(255,255,255,0.75);
  line-height: 1.7; padding-left: 1rem; position: relative;
}
.service-bullets li::before {
  content: ''; position: absolute; left: 0; top: 0.6em;
  width: 4px; height: 4px; background: var(--color-accent); border-radius: 50%;
}
.service-link { font-size: 0.8125rem; font-weight: 600; color: var(--color-accent); letter-spacing: 0.02em; transition: color var(--transition-fast); }
.service-link:hover { color: var(--color-accent-light); }

/* ===== SOLUTIONS SECTION ===== */
.solutions-section { padding: var(--section-padding) 0; background: var(--color-white); }

.solutions-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-bottom: 4rem; }

.solution-card {
  background: var(--color-white); border: 1.5px solid var(--color-gray-5);
  border-radius: var(--radius-lg); padding: 1.75rem;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}
.solution-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-xl); border-color: var(--color-primary-alpha); }

.solution-card-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.25rem; }
.solution-icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.solution-icon-blue { background: rgba(26,58,107,0.1); color: var(--color-primary); }
.solution-icon-teal { background: rgba(13,148,136,0.1); color: var(--color-teal); }
.solution-icon-orange { background: rgba(232,160,32,0.12); color: var(--color-accent); }

.solution-card-header h3 { font-size: 1.0625rem; font-weight: 700; color: var(--color-text); }

.solution-list { display: flex; flex-direction: column; gap: 0.625rem; margin-bottom: 1.25rem; }
.solution-list li {
  font-size: 0.875rem; color: var(--color-text-secondary); line-height: 1.5;
  padding-left: 1rem; position: relative;
}
.solution-list li::before {
  content: ''; position: absolute; left: 0; top: 0.55em;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--color-primary); opacity: 0.5;
}

.solution-apply {
  display: flex; flex-direction: column; gap: 0.25rem;
  padding: 0.875rem; background: var(--color-gray-6);
  border-radius: var(--radius-sm); border-left: 3px solid var(--color-accent);
}
.apply-label { font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-accent); }
.apply-text { font-size: 0.8125rem; color: var(--color-text-secondary); }

/* RTLS Detail */
.rtls-detail {
  display: grid; grid-template-columns: 1fr 1fr; gap: 4rem;
  background: var(--color-dark-3); border-radius: var(--radius-xl);
  padding: clamp(2rem, 4vw, 3.5rem); align-items: center;
}
.rtls-title { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 700; color: var(--color-white); margin: 0.75rem 0 1rem; }
.rtls-desc { font-size: 1rem; color: rgba(255,255,255,0.6); line-height: 1.75; margin-bottom: 2rem; }

.rtls-flow { display: flex; align-items: center; gap: 0.75rem; }
.rtls-flow-item {
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  flex: 1; padding: 0.875rem;
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md); text-align: center;
}
.rtls-flow-item .flow-icon {
  width: 40px; height: 40px;
  background: rgba(232,160,32,0.15); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center; color: var(--color-accent);
}
.rtls-flow-item span { font-size: 0.75rem; font-weight: 600; color: rgba(255,255,255,0.7); }
.flow-arrow { font-size: 1.25rem; color: var(--color-accent); flex-shrink: 0; }

.rtls-apps { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.rtls-app-item {
  display: flex; align-items: flex-start; gap: 0.875rem;
  padding: 1.25rem; background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.07); border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}
.rtls-app-item:hover { background: rgba(255,255,255,0.07); border-color: rgba(232,160,32,0.2); }
.rtls-app-icon { font-size: 1.5rem; flex-shrink: 0; }
.rtls-app-item div { display: flex; flex-direction: column; gap: 0.25rem; }
.rtls-app-item strong { font-size: 0.9375rem; font-weight: 600; color: var(--color-white); }
.rtls-app-item span { font-size: 0.8125rem; color: rgba(255,255,255,0.5); }

/* ===== PROJECTS SECTION ===== */
.projects-section { padding: var(--section-padding) 0; background: var(--color-gray-6); }

.projects-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-bottom: 3rem; }
.projects-col {
  background: var(--color-white); border-radius: var(--radius-xl);
  padding: 2rem; border: 1px solid var(--color-gray-5); box-shadow: var(--shadow-sm);
}
.projects-col-header {
  display: flex; align-items: center; gap: 0.75rem;
  margin-bottom: 1.5rem; padding-bottom: 1rem;
  border-bottom: 2px solid var(--color-gray-5);
}
.projects-col-header svg { color: var(--color-primary); }
.projects-col-header h3 { font-size: 1.125rem; font-weight: 700; color: var(--color-primary); }

.projects-list { display: flex; flex-direction: column; gap: 0.875rem; }
.projects-list li {
  display: flex; align-items: flex-start; gap: 0.875rem;
  padding: 0.875rem; border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}
.projects-list li:hover { background: var(--color-gray-6); }
.project-flag { font-size: 1.375rem; flex-shrink: 0; }
.project-info { display: flex; flex-direction: column; gap: 0.125rem; }
.project-info strong { font-size: 0.9375rem; font-weight: 600; color: var(--color-text); }
.project-info span { font-size: 0.8125rem; color: var(--color-text-secondary); }

.projects-quote {
  text-align: center;
  padding: 2rem;
  background: var(--color-primary);
  border-radius: var(--radius-xl);
}
.projects-quote blockquote {
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 500; color: var(--color-white);
  line-height: 1.6; font-style: normal;
  letter-spacing: -0.01em;
}

/* ===== HISTORY SECTION ===== */
.history-section { padding: var(--section-padding) 0; background: var(--color-white); overflow: hidden; }

.history-timeline {
  display: flex; align-items: center; position: relative;
  padding: 3rem 0;
}
.history-timeline::before {
  content: ''; position: absolute; left: 0; right: 0; top: 50%;
  height: 2px; background: linear-gradient(90deg, var(--color-primary-alpha) 0%, var(--color-primary) 20%, var(--color-primary) 80%, var(--color-accent) 100%);
  transform: translateY(-50%);
}

.history-item {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  position: relative; gap: 1rem;
}
.history-item-top { flex-direction: column-reverse; padding-bottom: 2rem; }
.history-item-bottom { padding-top: 2rem; }

.history-dot {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 3px var(--color-primary);
  position: relative; z-index: 1; flex-shrink: 0;
}
.history-dot-accent {
  background: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent);
}

.history-content { text-align: center; max-width: 160px; }
.history-year {
  display: block; font-size: 1.375rem; font-weight: 800;
  color: var(--color-primary); letter-spacing: -0.02em; margin-bottom: 0.375rem;
}
.history-year-accent { color: var(--color-accent); }
.history-content h4 { font-size: 0.875rem; font-weight: 600; color: var(--color-text); margin-bottom: 0.25rem; }
.history-content p { font-size: 0.75rem; color: var(--color-text-secondary); line-height: 1.5; }

/* ===== ABOUT SECTION ===== */
.about-section { position: relative; padding: var(--section-padding) 0; overflow: hidden; }
.about-bg { position: absolute; inset: 0; z-index: 0; }
.about-bg-gradient {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-3) 50%, #0d1a30 100%);
}
.about-section .section-inner { position: relative; z-index: 1; }

.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(3rem, 6vw, 6rem); align-items: start; }

.about-quote {
  font-size: 1rem; font-style: italic;
  color: rgba(255,255,255,0.7); line-height: 1.8;
  border-left: 3px solid var(--color-accent);
  padding-left: 1.25rem; margin: 1.5rem 0 2rem;
}
.about-values { display: flex; flex-direction: column; gap: 1.5rem; margin-bottom: 2.5rem; }
.about-value-item { display: flex; gap: 1rem; align-items: flex-start; }
.about-value-icon {
  width: 40px; height: 40px; flex-shrink: 0;
  background: rgba(232,160,32,0.15); border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center; color: var(--color-accent);
}
.about-value-item strong { font-size: 0.9375rem; font-weight: 600; color: var(--color-white); display: block; margin-bottom: 0.375rem; }
.about-value-item p { font-size: 0.875rem; color: rgba(255,255,255,0.55); line-height: 1.65; }

.company-info-card {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-xl); padding: 1.75rem; margin-bottom: 1.5rem;
}
.company-info-title {
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-accent); margin-bottom: 1.25rem;
}
.company-info-list { display: flex; flex-direction: column; gap: 0.875rem; }
.company-info-row { display: grid; grid-template-columns: 80px 1fr; gap: 1rem; align-items: start; }
.company-info-row dt { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.05em; color: rgba(255,255,255,0.4); padding-top: 0.125rem; }
.company-info-row dd { font-size: 0.9375rem; font-weight: 500; color: var(--color-white); }

.org-card {
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-xl); padding: 1.75rem;
}
.org-card-title { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-accent); margin-bottom: 1.25rem; }
.org-items { display: flex; flex-direction: column; gap: 0.875rem; }
.org-item {
  display: flex; flex-direction: column; gap: 0.25rem;
  padding: 0.875rem; background: rgba(255,255,255,0.04);
  border-radius: var(--radius-md); border-left: 3px solid var(--color-primary-light);
}
.org-dept { font-size: 0.875rem; font-weight: 600; color: var(--color-white); }
.org-desc { font-size: 0.8125rem; color: rgba(255,255,255,0.5); }

/* ===== CONTACT SECTION ===== */
.contact-section { padding: var(--section-padding) 0; background: var(--color-white); }
.contact-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: clamp(3rem, 6vw, 6rem); align-items: start; }
.contact-desc { font-size: 1.0625rem; color: var(--color-text-secondary); line-height: 1.75; margin-bottom: 2rem; }

.contact-details { display: flex; flex-direction: column; gap: 1.25rem; }
.contact-details li { display: flex; align-items: flex-start; gap: 1rem; }
.contact-details li svg { color: var(--color-primary); flex-shrink: 0; margin-top: 0.125rem; }
.contact-label { display: block; font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-gray-3); margin-bottom: 0.125rem; }
.contact-value { font-size: 0.9375rem; font-weight: 500; color: var(--color-text); }

.contact-form {
  background: var(--color-gray-6); border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 3vw, 2.5rem); border: 1px solid var(--color-gray-5);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { display: flex; flex-direction: column; gap: 0.375rem; margin-bottom: 1rem; }
.form-group label { font-size: 0.875rem; font-weight: 600; color: var(--color-text); }
.required { color: var(--color-error); }
.form-group input, .form-group select, .form-group textarea {
  padding: 0.75rem 1rem; font-size: 0.9375rem; color: var(--color-text);
  background: var(--color-white); border: 1.5px solid var(--color-gray-4);
  border-radius: var(--radius-md); outline: none; width: 100%;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-alpha);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-check { display: flex; align-items: flex-start; gap: 0.625rem; margin-bottom: 1.25rem; }
.form-check input[type="checkbox"] { width: 18px; height: 18px; flex-shrink: 0; margin-top: 0.125rem; accent-color: var(--color-primary); cursor: pointer; }
.form-check label { font-size: 0.875rem; color: var(--color-text-secondary); cursor: pointer; line-height: 1.5; }

/* ===== FOOTER ===== */
.site-footer { background: var(--color-dark); color: rgba(255,255,255,0.6); }
.footer-inner { max-width: var(--max-width); margin: 0 auto; padding: 0 clamp(1.5rem, 4vw, 4rem); }
.footer-top {
  display: grid; grid-template-columns: 1fr 2fr; gap: 4rem;
  padding: 3.5rem 0 2.5rem; border-bottom: 1px solid rgba(255,255,255,0.07);
}
.footer-logo .logo-text { color: var(--color-white); }
.footer-logo .logo-sub { color: rgba(255,255,255,0.4); }
.footer-tagline { font-size: 0.875rem; color: rgba(255,255,255,0.4); margin-top: 0.75rem; line-height: 1.6; }
.footer-address { font-size: 0.8125rem; color: rgba(255,255,255,0.3); margin-top: 0.375rem; }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.footer-link-group h4 { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(255,255,255,0.45); margin-bottom: 1rem; }
.footer-link-group ul { display: flex; flex-direction: column; gap: 0.625rem; }
.footer-link-group ul li, .footer-link-group ul a { font-size: 0.875rem; color: rgba(255,255,255,0.45); transition: color var(--transition-fast); }
.footer-link-group ul a:hover { color: var(--color-white); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding: 1.5rem 0; flex-wrap: wrap; gap: 1rem; }
.footer-copy { font-size: 0.8125rem; color: rgba(255,255,255,0.3); }
.footer-sep { margin: 0 0.5rem; opacity: 0.4; }
.footer-legal { display: flex; gap: 1.5rem; }
.footer-legal a { font-size: 0.8125rem; color: rgba(255,255,255,0.3); transition: color var(--transition-fast); }
.footer-legal a:hover { color: rgba(255,255,255,0.65); }

/* ===== SCROLL TOP ===== */
.scroll-top {
  position: fixed; bottom: 2rem; right: 2rem;
  width: 48px; height: 48px;
  background: var(--color-primary); color: var(--color-white);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-lg); opacity: 0; transform: translateY(12px);
  transition: all var(--transition-base); z-index: 100; pointer-events: none;
}
.scroll-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.scroll-top:hover { background: var(--color-primary-dark); transform: translateY(-2px); }

/* ===== REVEAL ANIMATION ===== */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.4,0,0.2,1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
  .solutions-grid { grid-template-columns: 1fr 1fr; }
  .rtls-detail { grid-template-columns: 1fr; gap: 2.5rem; }
  .history-timeline { flex-direction: column; align-items: flex-start; gap: 0; }
  .history-timeline::before { top: 0; bottom: 0; left: 27px; right: auto; width: 2px; height: auto; transform: none; }
  .history-item { flex-direction: row !important; padding: 0 0 2rem 0 !important; align-items: flex-start; gap: 1.5rem; width: 100%; }
  .history-dot { margin-left: 20px; flex-shrink: 0; }
  .history-content { text-align: left; max-width: none; }
  .footer-top { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 768px) {
  :root { --header-height: 64px; }
  .main-nav, .header-cta { display: none; }
  .hamburger { display: flex; }
  .mobile-menu { display: block; }
  .br-pc { display: none; }
  .hero-stats { flex-direction: column; gap: 1rem; padding: 1.25rem; }
  .stat-divider { width: 60px; height: 1px; }
  .stat-item { flex-direction: row; gap: 0.5rem; padding: 0; }
  .service-cards { flex-direction: column; height: auto; gap: 0.5rem; }
  .service-card { flex: none !important; height: 240px; }
  .service-card-detail { max-height: 0 !important; opacity: 0 !important; }
  .solutions-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .rtls-apps { grid-template-columns: 1fr; }
  .rtls-flow { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .hero-actions { flex-direction: column; align-items: center; }
}

@media (max-width: 480px) {
  .footer-links { grid-template-columns: 1fr; }
  .company-info-row { grid-template-columns: 70px 1fr; }
}

@media print {
  .site-header, .scroll-top, .hero-scroll-indicator { display: none; }
}