/* ============================================
   Heyu·Bot Landing Page - Main Stylesheet
   Design: Smart City · Public Agency · Trust
   ============================================ */

/* ===== CSS VARIABLES ===== */
:root {
  --color-navy: #0B2D6E;
  --color-navy-dark: #061C45;
  --color-navy-mid: #0D3A7A;
  --color-blue: #1E5FBF;
  --color-cyan: #00D4FF;
  --color-cyan-dark: #0B8FCC;
  --color-cyan-soft: #00A8CC;
  --color-white: #FFFFFF;
  --color-bg: #F0F4FA;
  --color-bg-light: #F7F9FC;
  --color-text: #1A2340;
  --color-text-mid: #3D5280;
  --color-text-light: #7A90B8;
  --color-border: #D0DCF0;
  --color-card-bg: #FFFFFF;

  --shadow-sm: 0 2px 8px rgba(11,45,110,0.08);
  --shadow-md: 0 8px 32px rgba(11,45,110,0.12);
  --shadow-lg: 0 20px 60px rgba(11,45,110,0.18);
  --shadow-cyan: 0 4px 24px rgba(0,212,255,0.25);

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  --font-main: 'Noto Sans KR', 'Inter', sans-serif;
  --navbar-h: 72px;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-bg-light);
  line-height: 1.6;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

.orange {color: orange}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-cyan-dark); border-radius: 3px; }

/* ===== CONTAINER ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(6, 28, 69, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0, 212, 255, 0.15);
  transition: var(--transition);
  height: var(--navbar-h);
}

.navbar.scrolled {
  background: rgba(6, 28, 69, 0.98);
  box-shadow: 0 4px 32px rgba(0,0,0,0.3);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: var(--navbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.3rem;
  color: white;
}

.logo-icon { display: flex; align-items: center; }
.logo-text { color: white; letter-spacing: -0.5px; }
.logo-dot { color: var(--color-cyan); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links li a {
  color: rgba(255,255,255,0.8);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-links li a:hover {
  color: var(--color-cyan);
  background: rgba(0, 212, 255, 0.08);
}

.nav-links li a.nav-cta {
  background: var(--color-cyan);
  color: var(--color-navy-dark);
  font-weight: 700;
  padding: 8px 20px;
}

.nav-links li a.nav-cta:hover {
  background: white;
  color: var(--color-navy-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-cyan);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: white;
  border-radius: 2px;
  transition: var(--transition);
}

.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;
  background: rgba(6, 28, 69, 0.98);
  border-top: 1px solid rgba(0, 212, 255, 0.15);
  padding: 12px 24px;
}

.mobile-menu.open { display: block; }

.mobile-menu ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-menu ul li a {
  display: block;
  padding: 10px 16px;
  color: rgba(255,255,255,0.85);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.mobile-menu ul li a:hover {
  color: var(--color-cyan);
  background: rgba(0, 212, 255, 0.08);
}

/* ===== SECTION COMMON ===== */
.section {
  position: relative;
  padding: 100px 0;
  overflow: hidden;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0, 212, 255, 0.1);
  color: var(--color-cyan-dark);
  border: 1px solid rgba(0, 212, 255, 0.25);
  padding: 6px 18px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-badge.light {
  background: rgba(0, 212, 255, 0.15);
  color: var(--color-cyan);
  border-color: rgba(0, 212, 255, 0.3);
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--color-navy);
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-title.light { color: white; }

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-mid);
  font-weight: 400;
  max-width: 560px;
  margin: 0 auto;
}

.section-subtitle.light { color: rgba(255,255,255,0.75); }

/* ===== REVEAL ANIMATION ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== BUTTONS ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--color-cyan);
  color: var(--color-navy-dark);
  font-weight: 700;
  font-size: 1rem;
  padding: 16px 32px;
  border-radius: var(--radius-md);
  transition: var(--transition);
  box-shadow: var(--shadow-cyan);
}

.btn-primary:hover {
  background: white;
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0, 212, 255, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.1);
  color: white;
  font-weight: 600;
  font-size: 1rem;
  padding: 16px 32px;
  border-radius: var(--radius-md);
  border: 1.5px solid rgba(255,255,255,0.25);
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.4);
  transform: translateY(-3px);
}

/* ===== HERO SECTION ===== */
.hero {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--color-navy-dark) 0%, var(--color-navy) 50%, #0D3A7A 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: calc(var(--navbar-h) + 40px) 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-cyan);
  opacity: 0;
  animation: float-particle 8s infinite ease-in-out;
}

@keyframes float-particle {
  0%, 100% { opacity: 0; transform: translateY(0) scale(0); }
  20% { opacity: 0.6; transform: translateY(-20px) scale(1); }
  80% { opacity: 0.3; transform: translateY(-80px) scale(0.5); }
}

.hero-content {
  max-width: 1100px;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 80px;
  position: relative;
  z-index: 1;
}

/* Hero emblem */
.hero-emblem {
  flex-shrink: 0;
  width: 260px;
  animation: float-emblem 6s ease-in-out infinite;
  filter: drop-shadow(0 0 40px rgba(0, 212, 255, 0.3));
}

@keyframes float-emblem {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  33% { transform: translateY(-12px) rotate(2deg); }
  66% { transform: translateY(-6px) rotate(-1deg); }
}

.emblem-svg { width: 100%; height: auto; }

.orbit-dot { animation: orbit1 4s linear infinite; transform-origin: 120px 120px; }
.orbit-dot-2 { animation: orbit2 4s linear infinite; transform-origin: 120px 120px; }
.orbit-dot-3 { animation: orbit3 4s linear infinite; transform-origin: 120px 120px; }

@keyframes orbit1 {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes orbit2 {
  from { transform: rotate(120deg); }
  to { transform: rotate(480deg); }
}
@keyframes orbit3 {
  from { transform: rotate(240deg); }
  to { transform: rotate(600deg); }
}

/* Hero text */
.hero-text {
  flex: 1;
  color: white;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 212, 255, 0.15);
  color: var(--color-cyan);
  border: 1px solid rgba(0, 212, 255, 0.3);
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  animation: fade-in-up 0.6s ease both;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  animation: fade-in-up 0.8s ease both 0.15s;
}

.gradient-text {
  background: linear-gradient(90deg, var(--color-cyan), #6BDDFF, var(--color-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% auto;
  animation: gradient-shift 3s linear infinite;
}

@keyframes gradient-shift {
  0% { background-position: 0% center; }
  100% { background-position: 200% center; }
}

.hero-desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.8);
  line-height: 1.7;
  margin-bottom: 36px;
  animation: fade-in-up 0.8s ease both 0.3s;
}

.hero-desc strong {
  color: var(--color-cyan);
  font-weight: 700;
}

/* Hero process */
.hero-process {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
  animation: fade-in-up 0.8s ease both 0.45s;
  flex-wrap: wrap;
}

.process-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}

.process-icon {
  width: 52px;
  height: 52px;
  background: rgba(0, 212, 255, 0.15);
  border: 1.5px solid rgba(0, 212, 255, 0.4);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--color-cyan);
  transition: var(--transition);
}

.process-step:hover .process-icon {
  background: rgba(0, 212, 255, 0.25);
  transform: scale(1.1);
}

.process-step span {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.8);
  font-weight: 500;
  white-space: nowrap;
}

.process-arrow {
  color: var(--color-cyan-dark);
  font-size: 1rem;
  opacity: 0.7;
}

/* Hero actions */
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fade-in-up 0.8s ease both 0.6s;
}

/* Scroll indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.5);
  font-size: 0.75rem;
  animation: fade-in-up 1s ease both 1s;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(0,212,255,0.5), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.5; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.2); }
}

@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== WHY SECTION ===== */
.why-section {
  background: var(--color-bg-light);
}

.why-layout {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 64px;
  align-items: start;
}

.why-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.shield-ai-icon { width: 100%; max-width: 200px; }
.shield-svg { width: 100%; height: auto; filter: drop-shadow(0 8px 32px rgba(11,45,110,0.2)); }

/* RAG flow */
.rag-flow {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.rag-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: white;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-navy);
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.rag-step i {
  font-size: 1.2rem;
  color: var(--color-blue);
}

.rag-step:hover {
  border-color: var(--color-cyan-dark);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.rag-arrow { color: var(--color-cyan-dark); font-size: 1.1rem; }

/* Why cards */
.why-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.why-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  display: flex;
  gap: 20px;
  transition: var(--transition);
}

.why-card:hover {
  border-color: rgba(30, 95, 191, 0.3);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.why-card.featured {
  border-color: rgba(0, 212, 255, 0.4);
  background: linear-gradient(135deg, #fff 0%, rgba(0, 212, 255, 0.04) 100%);
  flex-direction: column;
}

.why-card-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-navy), var(--color-blue));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-cyan);
  font-size: 1.2rem;
}

.why-card-content h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 6px;
}

.why-card-content p {
  font-size: 0.875rem;
  color: var(--color-text-mid);
  line-height: 1.6;
}

/* Cost bars */
.cost-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}

.cost-label {
  width: 80px;
  font-size: 0.78rem;
  color: var(--color-text-mid);
  font-weight: 500;
}

.cost-track {
  flex: 1;
  height: 10px;
  background: var(--color-bg);
  border-radius: 5px;
  overflow: hidden;
}

.cost-fill {
  height: 100%;
  border-radius: 5px;
  transition: width 1.5s ease;
}

.cost-fill.other { background: #CBD5E1; }
.cost-fill.ours { background: linear-gradient(90deg, var(--color-cyan), var(--color-cyan-dark)); }

.cost-percent {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-mid);
  width: 50px;
}

.cost-percent.heyu { color: var(--color-cyan-dark); }

/* ===== HOW SECTION ===== */
.how-section {
  background: white;
}

.how-timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.how-timeline::before {
  content: '';
  position: absolute;
  left: 36px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-cyan), var(--color-blue), rgba(11,45,110,0.1));
}

.timeline-item {
  display: flex;
  gap: 32px;
  margin-bottom: 48px;
  position: relative;
}

.timeline-item:last-child { margin-bottom: 0; }

.timeline-icon {
  width: 72px;
  height: 72px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-navy), var(--color-blue));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--color-cyan);
  border: 3px solid white;
  box-shadow: var(--shadow-md), 0 0 0 3px rgba(0, 212, 255, 0.2);
  z-index: 1;
  transition: var(--transition);
}

.timeline-item:hover .timeline-icon {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg), 0 0 0 6px rgba(0, 212, 255, 0.15);
}

.timeline-content {
  flex: 1;
  background: var(--color-bg-light);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}

.timeline-item:hover .timeline-content {
  border-color: rgba(30, 95, 191, 0.25);
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.timeline-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 10px;
}

.timeline-content p {
  font-size: 0.9rem;
  color: var(--color-text-mid);
  line-height: 1.7;
  margin-bottom: 16px;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(30, 95, 191, 0.08);
  color: var(--color-blue);
  border: 1px solid rgba(30, 95, 191, 0.15);
  border-radius: 100px;
  padding: 4px 12px;
  font-size: 0.78rem;
  font-weight: 600;
}

/* ===== FEATURES SECTION ===== */
.features-section {
  background: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature-card {
  background: white;
  border-radius: var(--radius-xl);
  padding: 36px;
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.feature-card:hover {
  border-color: rgba(30, 95, 191, 0.3);
  box-shadow: var(--shadow-lg);
  transform: translateY(-6px);
}

.feature-icon-wrap {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-navy), var(--color-blue));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--color-cyan);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--color-text-mid);
  line-height: 1.7;
  margin-bottom: 20px;
}

/* Chat demo */
.feature-demo {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chat-bubble {
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 0.8rem;
  line-height: 1.5;
  max-width: 90%;
}

.chat-bubble.user {
  background: rgba(30, 95, 191, 0.1);
  color: var(--color-navy);
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.chat-bubble.bot {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: 4px;
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

.chat-bubble.bot2 {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: 4px;
  display: flex;
  align-items: flex-start;
  gap: 6px;

  flex-wrap: wrap;
}

.chat-bubble.ai-response {
  background: rgba(0, 212, 255, 0.08);
  border-color: rgba(0, 212, 255, 0.2);
  color: var(--color-navy);
}

.small-icon { font-size: 0.75rem; color: var(--color-blue); margin-top: 2px; flex-shrink: 0; }

.suggest-btns {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-width: 90%;
}

.suggest-btn {
  background: white;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  font-size: 0.78rem;
  color: var(--color-navy);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
  font-family: var(--font-main);
}

.suggest-btn:hover {
  border-color: var(--color-cyan-dark);
  background: rgba(0, 212, 255, 0.05);
}

.reask-btn-wrap { display: flex; justify-content: center; }

.reask-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-cyan-dark));
  color: white;
  border: none;
  border-radius: 100px;
  padding: 8px 18px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-main);
}

.reask-btn:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-cyan);
}

/* Accordion demo */
.accordion-demo {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.acc-item {
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.acc-item.active {
  border-color: rgba(0, 212, 255, 0.4);
  background: rgba(0, 212, 255, 0.05);
}

.acc-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-navy);
  cursor: pointer;
}

.acc-header i:first-child { color: var(--color-blue); }
.acc-arrow { margin-left: auto; font-size: 0.7rem; color: var(--color-text-light); }

.acc-body {
  padding: 0 14px 12px;
  font-size: 0.8rem;
  color: var(--color-text-mid);
}

.acc-wrap{
    display: block;
  width: 100% !important; /* 부모 전체 너비를 차지하여 강제 개행 */
  flex-basis: 100%;       /* flex 환경에서 100% 점유 보장 */
  margin-top: 15px;       /* 텍스트와의 상단 간격 확보 */
  padding-top: 10px;      /* 필요 시 구분 선 등 추가 가능 */
}

/* ===== SECURITY SECTION ===== */
.security-section {
  background: var(--color-navy-dark);
  color: white;
}

.security-bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.06) 0%, transparent 60%),
    radial-gradient(circle at 80% 20%, rgba(30, 95, 191, 0.1) 0%, transparent 50%);
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.security-card {
  background: rgba(255,255,255,0.05);
  border: 1.5px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xl);
  padding: 36px;
  transition: var(--transition);
}

.security-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 212, 255, 0.1);
}

.security-icon {
  width: 56px;
  height: 56px;
  background: rgba(0, 212, 255, 0.15);
  border: 1.5px solid rgba(0, 212, 255, 0.3);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--color-cyan);
  margin-bottom: 20px;
}

.security-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: white;
  margin-bottom: 10px;
}

.security-card p {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
  margin-bottom: 16px;
}

.security-card p strong { color: var(--color-cyan); }

.security-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0, 212, 255, 0.15);
  color: var(--color-cyan);
  border: 1px solid rgba(0, 212, 255, 0.3);
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
}

/* Keyword examples */
.keyword-examples {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.keyword-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
}

.keyword-tag.sensitive {
  background: rgba(239, 68, 68, 0.15);
  color: #FCA5A5;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.keyword-tag.official {
  background: rgba(0, 212, 255, 0.15);
  color: var(--color-cyan);
  border: 1px solid rgba(0, 212, 255, 0.3);
}

.keyword-arrow { color: rgba(255,255,255,0.3); font-size: 0.9rem; }

/* Dashboard preview */
.dashboard-preview {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dash-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dash-label {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.6);
  width: 50px;
}

.dash-bar {
  flex: 1;
  height: 8px;
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
  overflow: hidden;
}

.dash-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-cyan), var(--color-cyan-dark));
  border-radius: 4px;
  transition: width 1.5s ease;
}

.dash-val {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-cyan);
  width: 35px;
  text-align: right;
}

/* Infra flow */
.security-infra {
  grid-column: 1 / -1;
  background: rgba(255,255,255,0.05);
  border: 1.5px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xl);
  padding: 36px;
}

.security-infra h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: white;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.security-infra h3 i { color: var(--color-cyan); }

.infra-flow {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.infra-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.08);
  border: 1.5px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  min-width: 100px;
  transition: var(--transition);
}

.infra-node i {
  font-size: 1.6rem;
  color: var(--color-cyan-soft);
}

.infra-node span {
  font-size: 0.82rem;
  font-weight: 600;
  color: rgba(255,255,255,0.8);
}

.infra-node.highlight {
  border-color: rgba(0, 212, 255, 0.5);
  background: rgba(0, 212, 255, 0.1);
}

.infra-node.highlight i { color: var(--color-cyan); }

.infra-conn {
  color: rgba(0, 212, 255, 0.5);
  font-size: 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

/* ===== CASE SECTION ===== */
.case-section {
  background: var(--color-bg-light);
}

.case-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.case-main {
  background: white;
  border-radius: var(--radius-xl);
  padding: 48px;
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.case-logo-area {
  display: flex;
  justify-content: center;
}

.city-emblem {
  position: relative;
  display: inline-block;
}

.city-svg { width: 200px; height: auto; }

.chatbot-icon-sm {
  position: absolute;
  bottom: -8px;
  right: -8px;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-cyan-dark));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
  border: 3px solid white;
  box-shadow: var(--shadow-sm);
}

.highlight-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 183, 0, 0.1);
  color: #B45309;
  border: 1px solid rgba(255, 183, 0, 0.3);
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.case-highlight h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-navy);
  margin-bottom: 12px;
  line-height: 1.35;
}

.case-highlight p {
  font-size: 0.9rem;
  color: var(--color-text-mid);
  line-height: 1.7;
}

/* Stats */
.case-stats {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stat-card {
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-mid) 100%);
  border-radius: var(--radius-xl);
  padding: 32px;
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  flex: 1;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

.stat-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.stat-icon {
  font-size: 1.8rem;
  color: var(--color-cyan);
  margin-bottom: 12px;
}

.stat-number {
  font-size: 2.8rem;
  font-weight: 900;
  color: white;
  line-height: 1;
  display: inline;
}

.stat-unit {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-cyan);
  display: inline;
}

.stat-label {
  font-size: 0.95rem;
  font-weight: 700;
  margin-top: 6px;
  margin-bottom: 4px;
}

.stat-desc {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.6);
}

/* Cost compare */
.cost-compare {
  background: white;
  border-radius: var(--radius-xl);
  padding: 40px;
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.cost-compare h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.cost-compare h3 i { color: var(--color-blue); }

.compare-bars { display: flex; flex-direction: column; gap: 16px; }

.compare-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.compare-label {
  width: 100px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-mid);
}

.compare-label.heyu-label { color: var(--color-cyan-dark); }

.compare-bar-wrap {
  flex: 1;
  height: 48px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.compare-bar-fill {
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 16px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 700;
  color: white;
  transition: width 2s ease;
}

.compare-bar-fill.competitor {
  background: linear-gradient(90deg, #64748B, #94A3B8);
}

.compare-bar-fill.heyu-bar {
  background: linear-gradient(90deg, var(--color-cyan), var(--color-cyan-dark));
}

.saving-badge {
  background: rgba(0, 212, 255, 0.1);
  color: var(--color-cyan-dark);
  border: 1.5px solid rgba(0, 212, 255, 0.3);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 0.82rem;
  font-weight: 800;
  white-space: nowrap;
}

/* ===== CONTACT SECTION ===== */
.contact-section {
  background: linear-gradient(145deg, var(--color-navy-dark), var(--color-navy), #0D3A7A);
  color: white;
  padding: 120px 0;
}

.contact-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 70%, rgba(0, 212, 255, 0.08) 0%, transparent 60%),
    radial-gradient(circle at 70% 30%, rgba(30, 95, 191, 0.15) 0%, transparent 50%);
}

.contact-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 48px;
  position: relative;
  z-index: 1;
}

.contact-header {
  text-align: center;
  max-width: 700px;
}

.contact-emblem {
  width: 80px;
  height: 80px;
  background: rgba(0, 212, 255, 0.15);
  border: 2px solid rgba(0, 212, 255, 0.4);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--color-cyan);
  margin: 0 auto 24px;
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.3); }
  50% { box-shadow: 0 0 0 20px rgba(0, 212, 255, 0); }
}

.contact-header h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
}

.contact-header p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.75);
  line-height: 1.7;
}

.contact-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
  padding: 18px 40px;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.contact-btn.primary {
  background: var(--color-cyan);
  color: var(--color-navy-dark);
  box-shadow: var(--shadow-cyan);
}

.contact-btn.primary:hover {
  background: white;
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 212, 255, 0.4);
}

.contact-btn.secondary {
  background: rgba(255,255,255,0.1);
  color: white;
  border: 2px solid rgba(255,255,255,0.25);
}

.contact-btn.secondary:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.5);
  transform: translateY(-4px);
}

/* Contact info grid */
.contact-info-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  width: 100%;
  max-width: 900px;
}

.contact-info-card {
  background: rgba(255,255,255,0.07);
  border: 1.5px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
  transition: var(--transition);
}

.contact-info-card:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-4px);
}

.ci-icon {
  width: 44px;
  height: 44px;
  background: rgba(0, 212, 255, 0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--color-cyan);
}

.ci-label {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.5);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.ci-value {
  font-size: 0.9rem;
  font-weight: 700;
  color: white;
}

.ci-value.small { font-size: 0.82rem; }

/* QR placeholder */
.qr-card { gap: 8px; }

.qr-placeholder {
  background: white;
  border-radius: var(--radius-sm);
  padding: 8px;
}

.qr-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-navy-dark);
  border-radius: 4px;
  padding: 4px;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--color-navy-dark);
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 48px 0 32px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  text-align: center;
}

.footer-brand {}

.footer-logo {
  font-size: 1.6rem;
  font-weight: 800;
  color: white;
}

.footer-logo span { color: var(--color-cyan); }

.footer-brand p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.7;
  margin-top: 8px;
}

.footer-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: rgba(255,255,255,0.55);
  font-size: 0.875rem;
  padding: 6px 14px;
  border-radius: 100px;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--color-cyan);
  background: rgba(0, 212, 255, 0.08);
}

.footer-copy {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.35);
  line-height: 1.8;
}

/* ===== SCROLL TO TOP ===== */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--color-cyan);
  color: var(--color-navy-dark);
  border: none;
  border-radius: 50%;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-cyan);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  z-index: 900;
}

.scroll-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.scroll-top:hover {
  background: white;
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 212, 255, 0.4);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .hero-content { gap: 48px; }
  .hero-emblem { width: 200px; }
  .why-layout { grid-template-columns: 1fr; gap: 40px; }
  .why-visual { flex-direction: row; justify-content: center; gap: 48px; }
  .security-grid { grid-template-columns: repeat(2, 1fr); }
  .case-layout { grid-template-columns: 1fr; }
  .case-stats { flex-direction: row; }
  .contact-info-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }

  .hero-content {
    flex-direction: column;
    text-align: center;
    gap: 40px;
  }
  .hero-emblem { width: 180px; }
  .hero-process { justify-content: center; }
  .hero-actions { justify-content: center; }

  .section { padding: 72px 0; }
  .section-header { margin-bottom: 48px; }

  .why-visual { flex-direction: column; }
  .features-grid { grid-template-columns: 1fr; }
  .security-grid { grid-template-columns: 1fr; }
  .security-infra { grid-column: 1; }
  .case-stats { flex-direction: column; }
  .contact-info-grid { grid-template-columns: repeat(2, 1fr); }

  .how-timeline::before { left: 24px; }
  .timeline-icon { width: 48px; height: 48px; font-size: 1rem; }

  .infra-flow { gap: 8px; }
  .infra-node { padding: 14px 16px; min-width: 70px; }

  .compare-item { flex-wrap: wrap; gap: 8px; }
  .compare-label { width: auto; }
  .compare-bar-wrap { width: 100%; }
  .saving-badge { width: 100%; text-align: center; }
}

@media (max-width: 480px) {
  .hero { padding: calc(var(--navbar-h) + 24px) 16px 64px; }
  .hero-process { gap: 8px; }
  .process-step span { font-size: 0.72rem; }
  .contact-info-grid { grid-template-columns: 1fr; }
  .contact-actions { flex-direction: column; align-items: stretch; }
  .contact-btn { justify-content: center; }
  .case-layout { gap: 24px; }
  .case-main { padding: 28px; }
}