:root {
  --smtpg-brand: #06b4d2;
  --smtpg-brand-2: #4fd1d9;
  --smtpg-text: #111827;
  --smtpg-muted: #4b5563;
  --smtpg-border: rgba(0, 0, 0, 0.08);
  --smtpg-bg: transparent;
  --smtpg-card-shadow: 0 10px 24px rgba(17, 24, 39, 0.08);
}

.smtpg-wrapper {
  width: 100%;
  position: relative;
  background: transparent;
  padding: 80px 24px;
  box-sizing: border-box;
  overflow: hidden;
  color: var(--smtpg-text);
  font-family: 'Inter', 'Pretendard', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.smtpg-container {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
}

.smtpg-glow {
  position: absolute;
  border-radius: 9999px;
  filter: blur(64px);
  pointer-events: none;
}

.smtpg-glow-1 {
  width: 320px;
  height: 320px;
  top: -120px;
  left: -140px;
  background: rgba(6, 180, 210, 0.18);
}

.smtpg-glow-2 {
  width: 420px;
  height: 420px;
  bottom: -160px;
  right: -120px;
  background: rgba(6, 180, 210, 0.12);
}

.smtpg-top-space {
  margin-bottom: 48px;
}

/* Timeline Desktop */
.smtpg-timeline-desktop {
  display: none;
  margin-bottom: 96px;
}

.smtpg-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px;
  position: relative;
}

.smtpg-line {
  position: absolute;
  top: 26px;
  left: 5%;
  right: 5%;
  height: 3px;
  background: linear-gradient(90deg, transparent, rgba(6, 180, 210, 0.45), transparent);
}

.smtpg-step-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--smtpg-border);
  border-radius: 16px;
  box-shadow: 0 6px 18px rgba(17, 24, 39, 0.06);
  backdrop-filter: blur(4px);
}

.smtpg-node {
  width: 48px;
  height: 48px;
  border-radius: 9999px;
  background: #fff;
  border: 4px solid var(--smtpg-brand);
  display: grid;
  place-items: center;
  box-shadow: 0 12px 28px rgba(6, 180, 210, 0.28);
}

.smtpg-node-inner {
  width: 18px;
  height: 18px;
  border-radius: 9999px;
  background: var(--smtpg-brand);
  display: inline-block;
}

.smtpg-step-body {
  text-align: center;
}

.smtpg-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: 9999px;
  border: 1px solid rgba(6, 180, 210, 0.3);
  background: rgba(6, 180, 210, 0.12);
  color: var(--smtpg-brand);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.smtpg-step-title {
  margin: 12px 0 10px;
  font-size: 18px;
  font-weight: 600;
  color: var(--smtpg-text);
  line-height: 1.5;
}

.smtpg-bullet-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.smtpg-bullet {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--smtpg-muted);
  font-size: 14px;
  line-height: 1.5;
}

.smtpg-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-top: 5px;
  background: var(--smtpg-brand);
  flex-shrink: 0;
}

.smtpg-dot-xs {
  width: 10px;
  height: 10px;
  margin-top: 0;
}

/* Timeline Mobile */
.smtpg-timeline-mobile {
  display: grid;
  gap: 24px;
  position: relative;
  margin-bottom: 72px;
}

.smtpg-timeline-mobile::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, transparent, rgba(6, 180, 210, 0.4), transparent);
}

.smtpg-step-mobile {
  position: relative;
  padding: 16px 16px 16px 24px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--smtpg-border);
  border-radius: 16px;
  box-shadow: 0 6px 18px rgba(17, 24, 39, 0.06);
  backdrop-filter: blur(4px);
}

.smtpg-step-mobile .smtpg-step-body {
  text-align: left;
}

.smtpg-node-mobile {
  position: absolute;
  left: -22px;
  top: 12px;
}

/* Bottom cards */
.smtpg-bottom {
  width: 100%;
}

.smtpg-section-title {
  text-align: center;
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 32px;
  color: var(--smtpg-text);
}

.smtpg-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.smtpg-card {
  position: relative;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--smtpg-card-shadow);
  backdrop-filter: blur(6px);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.smtpg-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(17, 24, 39, 0.12);
}

.smtpg-card-topbar {
  height: 6px;
  width: 100%;
  background: linear-gradient(135deg, var(--smtpg-brand) 0%, var(--smtpg-brand-2) 100%);
}

.smtpg-image-wrap {
  position: relative;
  height: 220px;
  overflow: hidden;
}

.smtpg-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.smtpg-card:hover .smtpg-image {
  transform: scale(1.04);
}

.smtpg-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 10px 14px;
  border-radius: 9999px;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--smtpg-brand) 0%, var(--smtpg-brand-2) 100%);
  box-shadow: 0 10px 24px rgba(6, 180, 210, 0.3);
}

.smtpg-image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.26));
  opacity: 0.7;
}

.smtpg-card-body {
  padding: 20px;
  display: grid;
  gap: 12px;
}

.smtpg-card-title {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  color: var(--smtpg-text);
}

.smtpg-card-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--smtpg-muted);
}

.smtpg-card-bullets .smtpg-dot {
  width: 10px;
  height: 10px;
  margin-top: 6px;
}

.smtpg-divider {
  height: 1px;
  width: 100%;
  background: linear-gradient(90deg, transparent, rgba(6, 180, 210, 0.25), transparent);
}

.smtpg-footnote {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #6b7280;
  font-size: 12px;
}

/* Responsive */
@media (min-width: 768px) {
  .smtpg-wrapper {
    padding: 96px 48px;
  }

  .smtpg-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .smtpg-wrapper {
    padding: 110px 72px;
  }

  .smtpg-timeline-desktop {
    display: block;
  }

  .smtpg-timeline-mobile {
    display: none;
  }

  .smtpg-card-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}