:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --accent: #7C3AED;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --bg: #FAFBFF;
  --surface: #FFFFFF;
  --text: #111827;
  --text-secondary: #4B5563;
  --text-muted: #9CA3AF;
  --border: #E5E7EB;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --radius: 16px;
  --radius-sm: 10px;
  --max-width: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 251, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.6);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.35rem;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
}

.brand-text {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-nav {
  display: flex;
  gap: 32px;
  font-weight: 500;
  color: var(--text-secondary);
}

.site-nav a:hover {
  color: var(--primary);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
}

.btn-ghost {
  background: white;
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.9rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
}

/* Hero */
.hero {
  padding: 100px 0 120px;
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}

.badge {
  display: inline-block;
  padding: 6px 14px;
  background: #EEF2FF;
  color: var(--primary);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1.15;
  font-weight: 900;
  margin: 0 0 24px;
  letter-spacing: -0.03em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.hero-bullets {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 24px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.hero-bullets li {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Hero visual */
.hero-visual {
  display: flex;
  justify-content: center;
}

.app-card {
  width: 100%;
  max-width: 460px;
  background: var(--surface);
  border-radius: 24px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  transform: perspective(1000px) rotateY(-6deg) rotateX(4deg);
  transition: transform 0.4s ease;
}

.app-card:hover {
  transform: perspective(1000px) rotateY(-2deg) rotateX(2deg);
}

.app-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  background: #F8FAFC;
  border-bottom: 1px solid var(--border);
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red { background: #FF5F57; }
.dot.yellow { background: #FFBD2E; }
.dot.green { background: #28C840; }

.app-title {
  margin-left: auto;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}

.app-card-body {
  display: grid;
  grid-template-columns: 130px 1fr;
  min-height: 320px;
}

.sidebar-mock {
  background: #F8FAFC;
  border-right: 1px solid var(--border);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-item {
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-item.active {
  background: #EEF2FF;
  color: var(--primary);
  font-weight: 700;
}

.preview-mock {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.doc-line {
  height: 12px;
  background: #E5E7EB;
  border-radius: 6px;
}

.w-70 { width: 70%; }
.w-90 { width: 90%; }
.w-60 { width: 60%; }
.w-80 { width: 80%; }

.signature-row {
  display: flex;
  gap: 16px;
  margin-top: 8px;
}

.signature-box {
  flex: 1;
  border: 2px dashed #CBD5E1;
  border-radius: 12px;
  padding: 16px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.signature-box.signed {
  border-color: var(--success);
  background: #ECFDF5;
  color: var(--success);
}

.sig-stroke {
  height: 28px;
  width: 80%;
  margin: 0 auto 8px;
  border-bottom: 3px solid var(--primary);
  border-radius: 50%;
  opacity: 0.6;
}

.check {
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 4px;
}

.verify-badge {
  margin-top: auto;
  align-self: flex-start;
  background: #DBEAFE;
  color: #1E40AF;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}

/* Sections */
.section {
  padding: 100px 0;
}

.section-alt {
  background: #F1F5F9;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-tag {
  display: inline-block;
  padding: 6px 14px;
  background: #EEF2FF;
  color: var(--primary);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Feature cards */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #C7D2FE;
}

.feature-card,
.template-card,
.tech-item,
.download-card {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.feature-card.is-visible,
.template-card.is-visible,
.tech-item.is-visible,
.download-card.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  background: #EEF2FF;
  border-radius: 14px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 10px;
}

.feature-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Templates */
.template-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.template-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 22px;
  text-align: center;
  transition: all 0.25s ease;
}

.template-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: #C7D2FE;
}

.template-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.template-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 10px;
}

.template-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.55;
}

/* Tech */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.tech-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tech-item strong {
  font-weight: 700;
  color: var(--text);
}

.tech-item span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Download */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.download-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  transition: all 0.25s ease;
}

.download-card:hover:not(.soon) {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #C7D2FE;
}

.download-card.soon {
  opacity: 0.6;
  cursor: default;
}

.download-icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
}

.download-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 6px;
}

.download-card p {
  margin: 0 0 12px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.download-meta {
  display: inline-block;
  padding: 4px 12px;
  background: #F3F4F6;
  color: var(--text-secondary);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.install-note {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 720px;
  margin: 0 auto;
}

.install-note h4 {
  margin: 0 0 16px;
  font-size: 1.1rem;
}

.install-note pre {
  background: #111827;
  color: #E5E7EB;
  padding: 20px;
  border-radius: 12px;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0 0 16px;
}

.install-deps {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  background: #0F172A;
  color: #CBD5E1;
  padding: 64px 0 24px;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand p {
  margin: 16px 0 0;
  font-size: 0.9rem;
  color: #94A3B8;
}

.footer-links {
  display: flex;
  gap: 32px;
  font-weight: 500;
}

.footer-links a:hover {
  color: white;
}

.copyright {
  border-top: 1px solid #1E293B;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: #64748B;
}

/* Responsive */
@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .template-grid { grid-template-columns: repeat(3, 1fr); }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .download-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .site-nav, .hidden-mobile { display: none; }
  .menu-toggle { display: block; }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero {
    padding: 64px 0 80px;
  }

  .hero-bullets {
    grid-template-columns: 1fr;
  }

  .app-card {
    transform: none;
    max-width: 100%;
  }

  .feature-grid,
  .template-grid,
  .tech-grid,
  .download-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    flex-direction: column;
    gap: 24px;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: 16px 24px;
  }
}

/* Mobile nav open state */
.site-nav.open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  gap: 16px;
  box-shadow: var(--shadow);
}