/*
 * sp-process.css — Sticky scroll process section
 * 4 steps: left sticky illustration, right scrolling text
 */

.sp-process-section {
  padding: var(--sp-7) 0;
}

.sp-process-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-6);
}

@media (min-width: 900px) {
  .sp-process-layout {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-6);
    align-items: start;
  }
}

/* Left: sticky illustration column */
.sp-process-sticky {
  position: relative;
}

@media (min-width: 900px) {
  .sp-process-sticky {
    position: sticky;
    top: 80px;
  }
}

.sp-process-illus {
  background: var(--sp-bg-2);
  border: 1px solid var(--sp-line);
  border-radius: var(--sp-r-lg);
  aspect-ratio: 1 / 1;
  max-width: 460px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.sp-process-illus-svg {
  width: 75%;
  height: 75%;
}

/* Active step indicator ring */
.sp-process-step-ring {
  position: absolute;
  bottom: var(--sp-3);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}

.sp-process-step-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--sp-r-full);
  background: var(--sp-line-2);
  transition: background 0.3s, width 0.3s var(--sp-ease);
}

.sp-process-step-dot.active {
  background: var(--sp-accent);
  width: 22px;
}

/* Right: steps column */
.sp-process-steps {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

/* Individual step */
.sp-process-step {
  padding: var(--sp-4);
  border: 1px solid var(--sp-line);
  border-radius: var(--sp-r-lg);
  background: var(--sp-bg-2);
  transition: border-color 0.3s, background 0.3s, box-shadow 0.3s var(--sp-ease);
  position: relative;
}

.sp-process-step.active {
  border-color: rgba(124,92,255,0.4);
  background: linear-gradient(145deg, rgba(124,92,255,0.06), var(--sp-bg-2));
  box-shadow: 0 4px 32px rgba(124,92,255,0.12);
}

/* Step number */
.sp-step-num {
  font-size: var(--sp-t-4xl);
  font-weight: 800;
  letter-spacing: -0.06em;
  line-height: 1;
  color: var(--sp-line-2);
  margin-bottom: var(--sp-2);
  font-variant-numeric: tabular-nums;
  transition: color 0.3s;
}

.sp-process-step.active .sp-step-num {
  color: var(--sp-accent);
}

.sp-step-title {
  font-size: var(--sp-t-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--sp-fg);
  margin-bottom: var(--sp-2);
}

.sp-step-desc {
  font-size: var(--sp-t-base);
  color: var(--sp-fg-2);
  line-height: 1.7;
  margin-bottom: var(--sp-2);
}

.sp-step-detail {
  font-size: var(--sp-t-sm);
  color: var(--sp-mute);
  line-height: 1.55;
}

/* Step tag (timing) */
.sp-step-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--sp-t-xs);
  font-weight: 600;
  color: var(--sp-accent);
  margin-top: var(--sp-2);
  letter-spacing: 0.04em;
}

/* Connecting line between steps */
.sp-process-steps::before {
  content: '';
  position: absolute;
  left: calc(var(--sp-4) + 12px);
  top: var(--sp-5);
  bottom: var(--sp-5);
  width: 1px;
  background: linear-gradient(to bottom, var(--sp-line), var(--sp-accent), var(--sp-line));
  display: none;
}

@media (min-width: 900px) {
  .sp-process-steps {
    position: relative;
  }
}

/* Mobile: full width, no sticky */
@media (max-width: 899px) {
  .sp-process-illus {
    max-width: 300px;
    margin: 0 auto;
    aspect-ratio: 4/3;
  }

  .sp-step-num {
    font-size: clamp(32px, 10vw, 56px);
  }

  .sp-step-title {
    font-size: var(--sp-t-lg);
  }
}