@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --bg-deep: #050608;
  --bg-main: #0a0c10;
  --bg-card: rgba(255, 255, 255, 0.02);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --bg-glass-active: rgba(255, 255, 255, 0.08);
  
  --border-muted: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(14, 165, 233, 0.35);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dark: #64748b;
  
  --primary: #2563eb;
  --primary-glow: rgba(37, 99, 235, 0.45);
  --secondary: #0ea5e9;
  --secondary-glow: rgba(14, 165, 233, 0.4);
  --accent: #10b981;

  /* 🎨 동적 테마 교정 변수 신설 */
  --bg-textarea: #090a0f;
  --text-textarea: #a7f3d0;
  --bg-console: #050608;
  --text-console: #38bdf8;
  --bg-diff: #050608;
  --text-collab-textarea: #f3f4f6;
  --bg-chat-bubble: rgba(255, 255, 255, 0.03);
}

[data-theme="light"] {
  --bg-deep: #f9fafb;
  --bg-main: #ffffff;
  --bg-card: rgba(0, 0, 0, 0.015);
  --bg-glass: rgba(0, 0, 0, 0.03);
  --bg-glass-active: rgba(0, 0, 0, 0.06);
  
  --border-muted: rgba(0, 0, 0, 0.08);
  --border-glow: rgba(139, 92, 246, 0.2);
  
  --text-main: #111827;
  --text-muted: #4b5563;
  --text-dark: #9ca3af;
  
  --primary: #7c3aed;
  --primary-glow: rgba(124, 58, 237, 0.15);
  --secondary: #0891b2;
  --secondary-glow: rgba(8, 145, 178, 0.15);

  /* 🎨 라이트 테마 변수 매핑 오버라이드 */
  --bg-textarea: #f3f4f6;
  --text-textarea: #047857;
  --bg-console: #e2e8f0;
  --text-console: #0369a1;
  --bg-diff: #f1f5f9;
  --text-collab-textarea: #1f2937;
  --bg-chat-bubble: #ffffff;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-deep);
  color: var(--text-main);
  font-family: 'Inter', sans-serif;
  line-height: 1.5;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 🎨 세련된 그라데이션 백그라운드 블러 글로우 (Apple/Vercel 감성) */
body::before {
  content: '';
  position: absolute;
  top: -10%;
  left: 30%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
  filter: blur(120px);
  z-index: -1;
  pointer-events: none;
}

body::after {
  content: '';
  position: absolute;
  bottom: 10%;
  right: 15%;
  width: 40vw;
  height: 40vw;
  background: radial-gradient(circle, var(--secondary-glow) 0%, transparent 70%);
  filter: blur(120px);
  z-index: -1;
  pointer-events: none;
}

/* ── 헤더 네비게이션 (Glassmorphism) ─────────────────────────── */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--bg-main);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  z-index: 1000;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.5px;
  cursor: pointer;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px var(--primary-glow);
  color: white;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.2s ease;
  position: relative;
  padding: 6px 4px;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-theme, .menu-burger {
  background: var(--bg-glass);
  border: 1px solid var(--border-muted);
  width: 34px;
  height: 34px;
  border-radius: 8px;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.btn-theme:hover {
  background: var(--bg-glass-active);
  border-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
}

/* ── 컨테이너 레이아웃 ─────────────────────────────────────────── */
.promo-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 120px 24px 80px;
  min-height: calc(100vh - 64px);
}

/* ── 메인 히어로 섹션 ─────────────────────────────────────────── */
.hero-section {
  text-align: center;
  padding: 60px 0;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-glass-active);
  border: 1px solid var(--border-glow);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 24px;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.1);
}

.hero-title {
  font-size: 48px;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.grad-text {
  background: linear-gradient(135deg, var(--primary) 20%, var(--secondary) 60%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 60px;
}

.btn-primary, .btn-secondary {
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border: none;
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(168, 85, 247, 0.5);
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-main);
  border: 1px solid var(--border-muted);
}

.btn-secondary:hover {
  background: var(--bg-glass-active);
  border-color: var(--text-muted);
  transform: translateY(-2px);
}

/* ── 3D 입체적 히어로 프리뷰 카드 ───────────────────────────────── */
.hero-preview-card {
  background: var(--bg-main);
  border: 1px solid var(--border-muted);
  border-radius: 16px;
  padding: 24px;
  max-width: 900px;
  margin: 0 auto;
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.4);
  transition: transform 0.1s ease-out;
  overflow: hidden;
  position: relative;
}

.hero-preview-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
}

.mac-bar {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
}

.mac-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.mac-red { background: #ef4444; }
.mac-yellow { background: #f59e0b; }
.mac-green { background: #10b981; }

.mock-editor-area {
  display: flex;
  gap: 20px;
  min-height: 250px;
  text-align: left;
}

/* ── 기막힌 피처 소개 카드 ───────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.feature-detail-card {
  background: var(--bg-card);
  border: 1px solid var(--border-muted);
  border-radius: 12px;
  padding: 24px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.feature-detail-card:hover {
  background: var(--bg-glass);
  border-color: var(--primary);
  box-shadow: 0 10px 30px var(--primary-glow);
  transform: translateY(-4px);
}

.feature-icon-wrapper {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(168, 85, 247, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 20px;
}

.feature-detail-card:hover .feature-icon-wrapper {
  background: var(--primary);
  color: white;
}

.expanded-desc {
  max-height: 0px;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.6;
}

.expanded-desc p {
  padding-top: 12px;
}

/* ── 3대 가상 런타임 맛보기 체험관 (CSS 변수 적용) ─────────────────── */
.simulator-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  background: var(--bg-main);
  border: 1px solid var(--border-muted);
  border-radius: 16px;
  padding: 24px;
  backdrop-filter: blur(20px);
  box-shadow: 0 15px 40px rgba(0,0,0,0.3);
  margin-top: 30px;
}

.sim-input-panel, .sim-output-panel {
  display: flex;
  flex-direction: column;
}

.sim-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.sim-textarea {
  flex: 1;
  background: var(--bg-textarea);
  border: 1px solid var(--border-muted);
  border-radius: 8px;
  padding: 12px;
  color: var(--text-textarea);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  resize: none;
  min-height: 180px;
}

.sim-textarea:focus {
  outline: none;
  border-color: var(--secondary);
}

.sim-console {
  flex: 1;
  background: var(--bg-console);
  border: 1px solid var(--border-muted);
  border-radius: 8px;
  padding: 12px;
  color: var(--text-console);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  overflow-y: auto;
  min-height: 180px;
  white-space: pre-wrap;
  word-break: break-all;
}

.status-running { color: #f59e0b; }
.status-error { color: #f87171; }

.run-btn {
  margin-top: 12px;
  background: linear-gradient(135deg, var(--secondary), var(--primary));
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  font-weight: bold;
  font-size: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.run-btn:hover {
  opacity: 0.9;
  box-shadow: 0 0 15px var(--secondary-glow);
}

/* ── SQL 결과 테이블 스타일 ────────────────────────────────────── */
.promo-sql-table {
  width: 100%;
  border-collapse: collapse;
  font-family: sans-serif;
  font-size: 11px;
}

.promo-sql-table th, .promo-sql-table td {
  padding: 6px 8px;
  text-align: left;
  border-bottom: 1px solid var(--border-muted);
}

.promo-sql-table th {
  background: var(--bg-card);
  color: var(--secondary);
}

/* ── AI 가상 시뮬레이터 카드 (CSS 변수 적용) ──────────────────────── */
.ai-sim-card {
  border-radius: 8px;
  padding: 12px;
  margin-top: 8px;
  font-family: sans-serif;
  font-size: 12px;
}

.ai-sim-card.pending {
  background: rgba(168, 85, 247, 0.08);
  border: 1px solid rgba(168, 85, 247, 0.25);
}

.sim-diff-box {
  background: var(--bg-diff);
  padding: 8px;
  border-radius: 6px;
  margin-top: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-main);
}

.sim-diff-removed { color: #f87171; text-decoration: line-through; }
.sim-diff-added { color: #4ade80; }
.sim-diff-normal { color: var(--text-muted); }

/* ── 3대 솔루션 탭 구조 ────────────────────────────────────────── */
.solutions-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 30px;
}

.solution-tab-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-muted);
  color: var(--text-muted);
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: all 0.2s;
}

.solution-tab-btn.active {
  background: var(--bg-glass-active);
  border-color: var(--primary);
  color: var(--text-main);
  box-shadow: 0 0 15px var(--primary-glow);
}

.solution-tab-content {
  display: none;
  background: var(--bg-main);
  border: 1px solid var(--border-muted);
  border-radius: 16px;
  padding: 30px;
}

.solution-tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

/* ── 비용 혜택 토글 계산기 ──────────────────────────────────────── */
.toggle-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 26px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: var(--bg-glass);
  border: 1px solid var(--border-muted);
  transition: .4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary);
}

input:checked + .slider:before {
  transform: translateX(24px);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.price-card {
  background: var(--bg-main);
  border: 1px solid var(--border-muted);
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  position: relative;
}

.price-card.featured {
  border-color: var(--primary);
  box-shadow: 0 0 30px var(--primary-glow);
}

.price-card.featured::after {
  content: 'POPULAR';
  position: absolute;
  top: 14px; right: 14px;
  background: var(--primary);
  color: white;
  font-size: 9px;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 4px;
}

/* ── 토스트 & 모달 ─────────────────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 2000;
}

.promo-toast {
  background: var(--bg-main);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-muted);
  border-radius: 8px;
  padding: 10px 16px;
  color: var(--text-main);
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  transform: translateY(50px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.promo-toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-success { border-color: rgba(16, 185, 129, 0.4); box-shadow: 0 0 15px rgba(16,185,129,0.15); }
.toast-error { border-color: rgba(239, 68, 68, 0.4); box-shadow: 0 0 15px rgba(239,68,68,0.15); }

.promo-modal-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1500;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.promo-modal-backdrop.show {
  opacity: 1;
}

.promo-modal-window {
  background: var(--bg-main);
  border: 1px solid var(--border-muted);
  border-radius: 16px;
  max-width: 500px;
  width: 90%;
  padding: 24px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.6);
  transform: translateY(20px);
  transition: transform 0.25s ease;
}

.promo-modal-backdrop.show .promo-modal-window {
  transform: translateY(0);
}

.promo-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.promo-modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
}

/* ── 애니메이션 ───────────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes cursor-blink {
  50% { background: transparent; }
}

.collab-user-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  border: 1px solid;
  font-size: 9px;
  font-weight: 700;
  margin-right: 4px;
}

/* 🎪 슬라이딩 캐러셀 플레이그라운드 스타일 */
.carousel-wrapper {
  overflow: hidden;
  position: relative;
  width: 100%;
  margin-top: 20px;
  transition: height 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.carousel-track {
  display: flex;
  align-items: flex-start;
  transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
  width: 500%; /* 5개 카드 (JS, Py, HTML, SQL, MCP/Market) */
}

.carousel-slide {
  width: 20%;
  flex-shrink: 0;
  padding: 0 10px;
}

/* 👥 가상 협업 에뮬레이터 전용 CSS (테마 변수 매핑 보강) */
.collab-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

.collab-editor-container {
  position: relative;
  background: var(--bg-textarea);
  border: 1px solid var(--border-muted);
  border-radius: 12px;
  padding: 16px;
  min-height: 300px;
}

.collab-textarea {
  width: 100%;
  height: 220px;
  background: transparent;
  border: none;
  color: var(--text-collab-textarea);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  resize: none;
  outline: none;
}

/* 실시간 네온 가상 커서 연출 */
.collab-cursor {
  position: absolute;
  width: 2px;
  height: 18px;
  background: #ec4899;
  animation: cursor-blink 0.8s step-end infinite;
  pointer-events: none;
  display: none;
  transition: left 0.1s linear, top 0.1s linear;
}

.collab-cursor-label {
  position: absolute;
  top: -18px;
  left: 0;
  background: #ec4899;
  color: white;
  font-size: 8px;
  font-weight: bold;
  padding: 1px 4px;
  border-radius: 3px;
  white-space: nowrap;
}

.collab-chat-panel {
  background: var(--bg-main);
  border: 1px solid var(--border-muted);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  height: 300px;
}

.collab-chat-header {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-muted);
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.collab-chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.collab-chat-bubble {
  background: var(--bg-chat-bubble);
  border: 1px solid var(--border-muted);
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 12px;
  max-width: 90%;
  color: var(--text-main);
  animation: fadeIn 0.25s ease-out;
}

.collab-chat-bubble.me {
  background: rgba(139, 92, 246, 0.15);
  border-color: rgba(139, 92, 246, 0.3);
  align-self: flex-end;
}

.collab-chat-sender {
  font-size: 9px;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 2px;
}

/* 📊 3대 도구 대체 비교 인포그래픽 테이블 스타일 */
.comparison-container {
  margin-top: 60px;
  text-align: center;
}

.comparison-table {
  width: 100%;
  max-width: 900px;
  margin: 30px auto 0;
  border-collapse: collapse;
  background: var(--bg-main);
  border: 1px solid var(--border-muted);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.comparison-table th, .comparison-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-muted);
  word-break: keep-all;
  overflow-wrap: break-word;
  line-height: 1.6;
  letter-spacing: -0.015em;
}

.comparison-table th {
  background: var(--bg-card);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  text-transform: uppercase;
}

.comparison-table td {
  font-size: 13px;
  color: var(--text-secondary);
}

.comparison-column-legacy {
  color: #ef4444;
  font-weight: 600;
}

.comparison-column-ameva {
  color: #10b981;
  font-weight: 700;
  background: rgba(16, 185, 129, 0.02);
}

/* 🎪 모바일 햄버거 토글 단추 기본 숨김 (데스크톱) */
.mobile-nav-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 20px;
  cursor: pointer;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  transition: background 0.2s;
}
.mobile-nav-toggle:hover {
  background: var(--bg-glass-active);
}

/* 🎪 모바일 전체화면 서랍 메뉴 오버레이 기본 숨김 */
.mobile-nav-overlay {
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-deep);
  z-index: 999;
  transform: translateY(-100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  padding: 24px;
  overflow-y: auto;
  border-top: 1px solid var(--border-muted);
}
.mobile-nav-overlay.active {
  transform: translateY(0);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
}
.mobile-nav-links .nav-link {
  font-size: 18px !important;
  font-weight: 700;
  color: var(--text-main);
  padding: 12px 16px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-muted);
  display: block;
  text-decoration: none;
  transition: all 0.2s;
}
.mobile-nav-links .nav-link:hover,
.mobile-nav-links .nav-link.active {
  background: var(--bg-glass-active);
  color: var(--primary) !important;
  border-color: var(--primary);
  padding-left: 20px; /* 밀어주는 이펙트 */
}

/* 📱 모바일 & 태블릿 최고급 반응형 미디어 쿼리 (768px 이하) */
@media (max-width: 768px) {
  /* 1. 헤더 네비게이션 햄버거 모드로 전환 */
  html body header {
    padding: 0 16px !important;
    height: 56px !important; /* 고정 컴팩트 높이 복원 */
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
  }
  
  /* 모바일에서 브랜드 이름 텍스트 크기를 작게 조율 */
  html body .brand span {
    font-size: 13px !important;
    max-width: 140px !important;
  }
  
  /* 데스크톱 가로 메뉴바 완전 삭제 (숨김) */
  html body .nav-menu {
    display: none !important;
  }
  
  /* 햄버거 토글러 및 테마 버튼 노출 */
  html body .mobile-nav-toggle {
    display: flex !important;
  }
  html body .header-actions {
    position: static !important;
    display: flex !important;
    align-items: center !important;
    gap: 10px !important;
  }
  html body .header-actions .btn-primary {
    display: none !important;
  }

  /* 2. 히어로 헤드라인 글자 크기 유연 감소 */
  .hero-title {
    font-size: 32px !important;
    line-height: 1.2 !important;
    letter-spacing: -1.2px !important;
  }
  .hero-subtitle {
    font-size: 13px !important;
    padding: 0 12px;
  }
  .hero-actions {
    flex-direction: column;
    gap: 10px;
    width: 100%;
    padding: 0 16px;
  }
  .hero-actions a {
    width: 100%;
    text-align: center;
  }

  /* 3. 협업 시뮬레이터 가로 폭 찌러짐 차단 */
  .collab-layout {
    display: grid !important;
    grid-template-columns: 1fr !important;
    gap: 16px !important;
  }
  .collab-editor-container {
    width: 100% !important;
  }
  .collab-chat-panel {
    width: 100% !important;
    height: 280px !important;
  }

  /* 4. 비교 대조표 가로 슬라이딩 스크롤 활성화 */
  .comparison-table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  /* 5. 기타 섹션 컨테이너 여백 축소 */
  .promo-container {
    padding: 86px 16px 40px !important; /* 상단 헤더 높이만큼 여백 최적화 */
  }
}

/* ── AI 인라인 시뮬레이션용 인풋 및 수락/거절 버튼 프리미엄 스타일 ── */
.sim-prompt-input {
  flex: 1;
  background: var(--bg-textarea);
  border: 1px solid var(--border-muted);
  border-radius: 6px;
  padding: 8px 12px;
  color: var(--text-main);
  font-size: 12px;
  outline: none;
  transition: all 0.2s ease;
}

.sim-prompt-input::placeholder {
  color: var(--text-dark);
  opacity: 0.7;
}

.sim-prompt-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.sim-btn-accept {
  background: linear-gradient(135deg, #10b981, #059669);
  border: none;
  color: #ffffff;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.2);
  transition: all 0.2s ease;
}

.sim-btn-accept:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35);
  filter: brightness(1.1);
}

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

.sim-btn-reject {
  background: var(--bg-glass);
  border: 1px solid var(--border-muted);
  color: var(--text-main);
  padding: 7px 16px; /* 보더 두께 고려 단차 정렬 */
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sim-btn-reject:hover {
  background: var(--bg-glass-active);
  border-color: var(--text-dark);
}

.sim-btn-reject:active {
  transform: scale(0.98);
}

/* 🎨 시뮬레이션용 애니메이션 효과 추가 */
@keyframes popIn {
  0% {
    transform: scale(0.85);
    opacity: 0;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes laserSweep {
  0% { top: 0%; opacity: 1; }
  50% { opacity: 0.8; }
  100% { top: 100%; opacity: 1; }
}

/* 🎬 인앱 미디어 & AI 시뮬레이터 카드 스타일 (Monumental 2-Column Balanced Master Grid) */
.sim-monumental-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin: 40px 0 80px 0;
}

.sim-hero-card {
  grid-column: span 2;
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.45) 0%, rgba(15, 23, 42, 0.85) 100%);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 20px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(16px);
}

.sim-hero-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1.5px;
  background: linear-gradient(90deg, transparent, #38bdf8, transparent);
}

.sim-master-card {
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.4) 0%, rgba(15, 23, 42, 0.8) 100%);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 20px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  box-shadow: 0 14px 40px rgba(0,0,0,0.4);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(16px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sim-master-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 24px 50px rgba(56, 189, 248, 0.18);
}

.sim-master-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

@media (max-width: 900px) {
  .sim-monumental-grid {
    grid-template-columns: 1fr;
  }
  .sim-hero-card, .sim-master-card {
    grid-column: span 1 !important;
  }
}

.sim-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.sim-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sim-card-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sim-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(56,189,248,0.15);
  color: #38bdf8;
  border: 1px solid rgba(56,189,248,0.3);
}

/* 🖼️ 배경 제거 투명 바둑판 */
.bg-transparent-checkered {
  background-image: linear-gradient(45deg, #1e293b 25%, transparent 25%), 
                    linear-gradient(-45deg, #1e293b 25%, transparent 25%), 
                    linear-gradient(45deg, transparent 75%, #1e293b 75%), 
                    linear-gradient(-45deg, transparent 75%, #1e293b 75%) !important;
  background-size: 16px 16px !important;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px !important;
}

/* 📑 맵리듀스 덱 카드 */
.doc-deck-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.deck-card {
  background: #0b111e;
  border: 1px solid var(--border-muted);
  border-radius: 10px;
  padding: 14px;
}

.deck-card h4 {
  font-size: 13px;
  font-weight: 700;
  margin: 6px 0 4px 0;
  color: var(--text-main);
}

.deck-card p {
  font-size: 11.5px;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

.deck-badge {
  font-size: 10.5px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  display: inline-block;
}

/* 💬 AI Agent Chat Bubbles */
.chat-bubble {
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 12.5px;
  line-height: 1.6;
  max-width: 90%;
  animation: fadeInUp 0.25s ease;
}

.user-bubble {
  background: rgba(56,189,248,0.15);
  border: 1px solid rgba(56,189,248,0.3);
  color: #e0f2fe;
  align-self: flex-end;
  border-bottom-right-radius: 2px;
}

.bot-bubble {
  background: #0f172a;
  border: 1px solid var(--border-muted);
  color: #cbd5e1;
  align-self: flex-start;
  border-bottom-left-radius: 2px;
  white-space: pre-wrap;
}

.agent-tool-calling {
  font-size: 11px;
  color: #f59e0b;
  background: rgba(245,158,11,0.1);
  border: 1px dashed rgba(245,158,11,0.3);
  padding: 6px 10px;
  border-radius: 6px;
  align-self: flex-start;
}

/* 🌐 문체 다듬기 Diff */
.diff-box {
  background: #070a0f;
  border: 1px solid var(--border-muted);
  border-radius: 8px;
  padding: 12px;
  font-size: 12.5px;
  line-height: 1.7;
}

.diff-del {
  color: #f87171;
  background: rgba(239, 68, 68, 0.1);
  padding: 4px 8px;
  border-radius: 4px;
}

.diff-ins {
  color: #34d399;
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 8px;
  border-radius: 4px;
}

.tone-pill-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-muted);
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tone-pill-btn.active {
  background: var(--primary-glow);
  color: #38bdf8;
  border-color: var(--secondary);
}

/* ── 🚀 16-Core Matrix & Features Premium Grid Styling ── */
.feature-filter-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.filter-tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-muted);
  color: var(--text-muted);
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.filter-tab-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.2);
}

.filter-tab-btn.active {
  background: linear-gradient(135deg, #2563eb, #0ea5e9);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
}

.features-matrix-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  width: 100%;
  margin-bottom: 60px;
}

@media (max-width: 960px) {
  .features-matrix-grid {
    grid-template-columns: 1fr;
  }
}

.matrix-card {
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.4) 0%, rgba(15, 23, 42, 0.75) 100%);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 18px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.matrix-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 20px 48px rgba(56, 189, 248, 0.16);
}

.matrix-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.matrix-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.matrix-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
}

.matrix-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 12px;
  border: 1px solid;
  letter-spacing: 0.3px;
}

.matrix-slash-tag {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.matrix-slash-tag code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  color: #38bdf8;
  font-family: monospace;
  font-size: 11.5px;
}

.matrix-title {
  font-size: 17px;
  font-weight: 800;
  color: #f8fafc;
  margin-bottom: 10px;
  line-height: 1.35;
}

.matrix-desc {
  font-size: 13px;
  color: #94a3b8;
  line-height: 1.65;
  margin-bottom: 16px;
  flex: 1;
}

.matrix-specs {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.matrix-specs li {
  font-size: 12px;
  color: #cbd5e1;
  line-height: 1.5;
  position: relative;
  padding-left: 14px;
}

.matrix-specs li::before {
  content: '•';
  position: absolute;
  left: 2px;
  color: #38bdf8;
  font-weight: bold;
}

.matrix-specs li strong {
  color: #f1f5f9;
  font-weight: 700;
}

.matrix-why-box {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-left: 3px solid #38bdf8;
  border-radius: 8px;
  padding: 12px 14px;
  margin: 12px 0 16px 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: #e2e8f0;
}

.matrix-why-title {
  font-size: 11.5px;
  font-weight: 800;
  color: #38bdf8;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ── ☀️ Comprehensive High-Contrast Light Mode Overrides ─────────────────────── */
[data-theme="light"] {
  --bg-deep: #f8fafc;
  --bg-main: #ffffff;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --border-muted: #e2e8f0;
}

[data-theme="light"] body {
  background-color: #f8fafc;
  color: #0f172a;
}

[data-theme="light"] header {
  background: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid #e2e8f0;
}

[data-theme="light"] .brand,
[data-theme="light"] .nav-link {
  color: #334155;
}

[data-theme="light"] .nav-link:hover,
[data-theme="light"] .nav-link.active {
  color: #2563eb;
  background: rgba(37, 99, 235, 0.08);
}

[data-theme="light"] .matrix-card,
[data-theme="light"] .sim-master-card,
[data-theme="light"] .sim-hero-card,
[data-theme="light"] .hero-preview-card {
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05) !important;
}

[data-theme="light"] .matrix-card::before,
[data-theme="light"] .sim-master-card::before,
[data-theme="light"] .sim-hero-card::before {
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.35), transparent) !important;
}

[data-theme="light"] .matrix-title,
[data-theme="light"] .sim-card-title,
[data-theme="light"] h1,
[data-theme="light"] h2,
[data-theme="light"] h3 {
  color: #0f172a !important;
}

[data-theme="light"] .matrix-desc,
[data-theme="light"] .matrix-specs li,
[data-theme="light"] p {
  color: #334155 !important;
}

[data-theme="light"] .matrix-specs li strong {
  color: #0f172a !important;
}

[data-theme="light"] .matrix-why-box {
  background: #f1f5f9 !important;
  border: 1px solid #cbd5e1 !important;
  border-left: 3px solid #2563eb !important;
  color: #1e293b !important;
}

[data-theme="light"] .matrix-why-title {
  color: #2563eb !important;
}

[data-theme="light"] .badge-tag {
  background: rgba(37, 99, 235, 0.08) !important;
  color: #2563eb !important;
  border-color: rgba(37, 99, 235, 0.25) !important;
}

[data-theme="light"] .tone-pill-btn {
  background: #f1f5f9 !important;
  border: 1px solid #cbd5e1 !important;
  color: #334155 !important;
}

[data-theme="light"] .tone-pill-btn:hover {
  background: #e2e8f0 !important;
  color: #0f172a !important;
}

[data-theme="light"] .tone-pill-btn.active {
  background: #2563eb !important;
  color: #ffffff !important;
  border-color: #2563eb !important;
}

[data-theme="light"] .matrix-slash-tag code {
  background: #f1f5f9 !important;
  border: 1px solid #e2e8f0 !important;
  color: #2563eb !important;
}

[data-theme="light"] .filter-tab-btn {
  background: #ffffff !important;
  border: 1px solid #cbd5e1 !important;
  color: #475569 !important;
}

[data-theme="light"] .filter-tab-btn:hover {
  background: #f1f5f9 !important;
  color: #0f172a !important;
}

[data-theme="light"] .filter-tab-btn.active {
  background: linear-gradient(135deg, #2563eb, #0ea5e9) !important;
  color: #ffffff !important;
  border-color: transparent !important;
}

[data-theme="light"] .diff-box {
  background: #f8fafc !important;
  border: 1px solid #e2e8f0 !important;
}

[data-theme="light"] .diff-del {
  background: rgba(239, 68, 68, 0.1) !important;
  color: #dc2626 !important;
}

[data-theme="light"] .diff-ins {
  background: rgba(16, 185, 129, 0.12) !important;
  color: #059669 !important;
}

[data-theme="light"] .chat-bubble.bot-bubble {
  background: #f1f5f9 !important;
  color: #0f172a !important;
  border: 1px solid #e2e8f0 !important;
}

[data-theme="light"] .chat-bubble.user-bubble {
  background: #2563eb !important;
  color: #ffffff !important;
}

[data-theme="light"] .comparison-table {
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05) !important;
}

[data-theme="light"] .comparison-table th {
  background: #f8fafc !important;
  color: #0f172a !important;
  border-bottom: 1px solid #e2e8f0 !important;
}

[data-theme="light"] .comparison-table td {
  border-bottom: 1px solid #e2e8f0 !important;
  color: #1e293b !important;
}

[data-theme="light"] .comparison-column-legacy {
  color: #dc2626 !important;
}

[data-theme="light"] .comparison-column-ameva {
  color: #059669 !important;
  background: rgba(16, 185, 129, 0.05) !important;
}

[data-theme="light"] .mock-editor-area {
  background: #f8fafc !important;
  color: #0f172a !important;
  border: 1px solid #e2e8f0 !important;
}

[data-theme="light"] .mac-bar {
  background: #e2e8f0 !important;
  border-bottom: 1px solid #cbd5e1 !important;
}