/* ===========================================
   6-Step Purification Process
   - 各段階に独自アニメSVGアイコン
   - 流れる水のタイムライン
   - グラスモーフィズムカード
   - スクロール連動レビール
   =========================================== */

.process {
  background-color: var(--color-bg-soft);
  position: relative;
  overflow-x: clip;
}

/* 背景の柔らかい光のブロブ */
.process::before {
  content: '';
  position: absolute;
  top: 10%;
  right: -10%;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34, 190, 240, 0.08) 0%, transparent 70%);
  filter: blur(20px);
  pointer-events: none;
  animation: processBlobFloat 18s ease-in-out infinite;
}

.process::after {
  content: '';
  position: absolute;
  bottom: 8%;
  left: -10%;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 99, 138, 0.06) 0%, transparent 70%);
  filter: blur(20px);
  pointer-events: none;
  animation: processBlobFloat 22s ease-in-out infinite -8s;
}

@keyframes processBlobFloat {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

.process__steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  position: relative;
  margin-top: var(--space-4);
  padding-block: var(--space-3);
}

@media (min-width: 768px) {
  .process__steps {
    gap: var(--space-5);
    margin-top: var(--space-6);
  }
}

/* ---------- タイムライン縦線（流れる水） ---------- */
.process__steps::before {
  content: '';
  position: absolute;
  left: 28px;
  top: 0;
  bottom: 0;
  width: 2px;
  background:
    linear-gradient(180deg,
      rgba(34, 190, 240, 0) 0%,
      rgba(34, 190, 240, 0.5) 8%,
      rgba(34, 190, 240, 0.5) 92%,
      rgba(34, 190, 240, 0) 100%);
}

/* タイムライン上を流れる水の光 */
.process__steps::after {
  content: '';
  position: absolute;
  left: 28px;
  top: 0;
  width: 2px;
  height: 80px;
  background: linear-gradient(180deg,
    transparent 0%,
    rgba(34, 190, 240, 0) 0%,
    rgba(34, 190, 240, 1) 50%,
    rgba(34, 190, 240, 0) 100%);
  filter: blur(1px);
  animation: timelineFlow 6s ease-in-out infinite;
  pointer-events: none;
}

@keyframes timelineFlow {
  0% { top: -80px; opacity: 0; }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { top: 100%; opacity: 0; }
}

@media (min-width: 1024px) {
  .process__steps::before,
  .process__steps::after {
    left: 50%;
    transform: translateX(-50%);
  }
}

/* ---------- ステップ ---------- */
.process__step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: var(--space-3);
  position: relative;
  align-items: center;
}

@media (min-width: 480px) {
  .process__step {
    grid-template-columns: 64px 1fr;
    gap: var(--space-3);
  }
}

@media (min-width: 1024px) {
  .process__step {
    grid-template-columns: 1fr 96px 1fr;
    gap: var(--space-4);
    align-items: center;
  }

  /* 偶数番ステップ: コンテンツ右側 */
  .process__step:nth-child(even) .process__step-content {
    grid-column: 3;
    grid-row: 1;
    text-align: left;
  }

  /* 奇数番ステップ: コンテンツ左側 */
  .process__step:nth-child(odd) .process__step-content {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
  }

  .process__step-marker {
    grid-column: 2;
    grid-row: 1;
  }
}

/* ---------- マーカー（円形SVGアイコン） ---------- */
.process__step-marker {
  position: relative;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-base);
  border: 1.5px solid rgba(34, 190, 240, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  z-index: 2;
  transition: all 0.5s var(--ease-out);
  box-shadow:
    0 4px 12px rgba(34, 190, 240, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

@media (min-width: 480px) {
  .process__step-marker {
    width: 64px;
    height: 64px;
  }
}

@media (min-width: 1024px) {
  .process__step-marker {
    width: 96px;
    height: 96px;
    margin-inline: auto;
  }
}

/* マーカー外側のリング（パルス） */
.process__step-marker::before {
  content: '';
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 1px solid rgba(34, 190, 240, 0.15);
  opacity: 0;
  transition: opacity 0.5s var(--ease-out);
}

.process__step-marker::after {
  content: '';
  position: absolute;
  inset: -16px;
  border-radius: 50%;
  border: 1px solid rgba(34, 190, 240, 0.08);
  opacity: 0;
  transition: opacity 0.5s var(--ease-out);
}

/* 番号ラベル（マーカー左上に小さく） */
.process__step-num {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 24px;
  height: 24px;
  background: var(--color-text);
  color: var(--color-base);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  z-index: 3;
  transition: all 0.5s var(--ease-out);
  box-shadow: 0 2px 6px rgba(0, 99, 138, 0.2);
}

@media (min-width: 1024px) {
  .process__step-num {
    width: 28px;
    height: 28px;
    font-size: 0.6875rem;
    top: -4px;
    right: -4px;
  }
}

/* ---------- アイコン共通 ---------- */
.process__icon {
  width: 60%;
  height: 60%;
  color: var(--color-accent-sky);
  transition: color 0.5s var(--ease-out);
}

@media (min-width: 1024px) {
  .process__icon {
    width: 65%;
    height: 65%;
  }
}

/* ---------- ステップが画面に入った時のマーカー演出 ---------- */
.process__step.is-visible .process__step-marker {
  background: linear-gradient(135deg, #22BEF0 0%, #00638A 100%);
  border-color: transparent;
  box-shadow:
    0 8px 24px rgba(34, 190, 240, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
  transform: scale(1.05);
}

.process__step.is-visible .process__step-marker::before {
  opacity: 1;
  animation: markerPulse 2.5s ease-out infinite;
}

.process__step.is-visible .process__step-marker::after {
  opacity: 1;
  animation: markerPulse 2.5s ease-out infinite -1s;
}

.process__step.is-visible .process__icon {
  color: var(--color-base);
}

.process__step.is-visible .process__step-num {
  background: var(--color-accent-lime);
  color: var(--color-text);
  transform: scale(1.1);
}

@keyframes markerPulse {
  0% { transform: scale(1); opacity: 0.8; }
  100% { transform: scale(1.4); opacity: 0; }
}

/* ==========================================================
   各アイコンの個別アニメーション
   ========================================================== */

/* ① 空気の浄化: 粒子がフィルターを通り抜ける */
.process__icon-particles circle {
  fill: currentColor;
  opacity: 0.6;
}

.process__step.is-visible .process__icon-particles circle {
  animation: airParticleFlow 2.5s ease-in-out infinite;
}

.process__step.is-visible .process__icon-particles circle:nth-child(1) { animation-delay: 0s; }
.process__step.is-visible .process__icon-particles circle:nth-child(2) { animation-delay: 0.6s; }
.process__step.is-visible .process__icon-particles circle:nth-child(3) { animation-delay: 1.2s; }
.process__step.is-visible .process__icon-particles circle:nth-child(4) { animation-delay: 1.8s; }

@keyframes airParticleFlow {
  0% { transform: translateX(0); opacity: 0; }
  20% { opacity: 0.9; }
  60% { transform: translateX(15px); opacity: 0.4; }
  100% { transform: translateX(28px); opacity: 0; }
}

.process__step.is-visible .process__icon-clean circle {
  animation: cleanParticleEmit 2.5s ease-out infinite;
}

.process__step.is-visible .process__icon-clean circle:nth-child(1) { animation-delay: 0.4s; }
.process__step.is-visible .process__icon-clean circle:nth-child(2) { animation-delay: 1s; }
.process__step.is-visible .process__icon-clean circle:nth-child(3) { animation-delay: 1.6s; }

@keyframes cleanParticleEmit {
  0% { transform: translateX(-10px); opacity: 0; }
  30% { opacity: 1; }
  100% { transform: translateX(8px); opacity: 0; }
}

/* ② 凝縮: 雲から水滴が滴り落ちる */
.process__step.is-visible .process__icon-cloud {
  animation: cloudBob 4s ease-in-out infinite;
  transform-origin: center;
}

@keyframes cloudBob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-2px); }
}

.process__drop {
  transform-origin: center top;
  opacity: 0;
}

.process__step.is-visible .process__drop {
  animation: dropFalls 2.4s ease-in infinite;
}

.process__step.is-visible .process__drop--1 { animation-delay: 0s; }
.process__step.is-visible .process__drop--2 { animation-delay: 0.8s; }
.process__step.is-visible .process__drop--3 { animation-delay: 1.6s; }

@keyframes dropFalls {
  0% { transform: translateY(0) scale(0.8); opacity: 0; }
  20% { opacity: 1; }
  80% { opacity: 0.6; }
  100% { transform: translateY(14px) scale(1.1, 0.7); opacity: 0; }
}

/* ③ ろ過: 漏斗から水滴が滴る */
.process__icon-funnel line {
  stroke-dasharray: 24;
  stroke-dashoffset: 24;
}

.process__step.is-visible .process__icon-funnel line {
  animation: funnelFill 1.5s ease-out forwards;
}

.process__step.is-visible .process__icon-funnel line:nth-child(2) { animation-delay: 0.2s; }
.process__step.is-visible .process__icon-funnel line:nth-child(3) { animation-delay: 0.4s; }

@keyframes funnelFill {
  to { stroke-dashoffset: 0; }
}

.process__flow-drop {
  opacity: 0;
}

.process__step.is-visible .process__flow-drop {
  animation: flowDripping 2s ease-in infinite 0.8s;
}

@keyframes flowDripping {
  0% { transform: translateY(-10px); opacity: 0; }
  30% { opacity: 1; }
  70% { opacity: 1; }
  100% { transform: translateY(8px); opacity: 0; }
}

/* ④ 循環殺菌: 矢印リングが回転 */
.process__icon-rotate {
  transform-origin: 32px 32px;
}

.process__step.is-visible .process__icon-rotate {
  animation: circulateRotate 4s linear infinite;
}

@keyframes circulateRotate {
  to { transform: rotate(360deg); }
}

.process__step.is-visible .process__icon-center {
  animation: centerPulse 2s ease-in-out infinite;
  transform-origin: 32px 38px;
}

@keyframes centerPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.15); opacity: 0.7; }
}

/* ⑤ 紫外線殺菌: ランプから光線が放射 + スパーク */
.process__ray {
  stroke-dasharray: 20;
  stroke-dashoffset: 20;
  opacity: 0.6;
}

.process__step.is-visible .process__ray {
  animation: rayEmit 2s ease-out infinite;
}

.process__step.is-visible .process__ray--1 { animation-delay: 0s; }
.process__step.is-visible .process__ray--2 { animation-delay: 0.3s; }
.process__step.is-visible .process__ray--3 { animation-delay: 0.6s; }

@keyframes rayEmit {
  0% { stroke-dashoffset: 20; opacity: 0; }
  30% { opacity: 1; }
  60% { stroke-dashoffset: 0; opacity: 0.9; }
  100% { stroke-dashoffset: 0; opacity: 0; }
}

.process__spark {
  opacity: 0;
}

.process__step.is-visible .process__spark {
  animation: sparkFlash 2s ease-in-out infinite;
}

.process__step.is-visible .process__spark--1 { animation-delay: 0.6s; }
.process__step.is-visible .process__spark--2 { animation-delay: 0.9s; }
.process__step.is-visible .process__spark--3 { animation-delay: 1.2s; }

@keyframes sparkFlash {
  0%, 100% { opacity: 0; transform: scale(0.5); }
  50% { opacity: 1; transform: scale(1.5); }
}

/* ⑥ 安全な飲料水: グラスに水が満ち、輝く */
.process__water-fill {
  transform: translateY(20px);
  opacity: 0;
}

.process__step.is-visible .process__water-fill {
  animation: waterFillUp 1.6s ease-out forwards 0.3s;
}

@keyframes waterFillUp {
  0% { transform: translateY(20px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0.8; }
}

.process__shine {
  opacity: 0;
}

.process__step.is-visible .process__shine {
  animation: shineSparkle 3s ease-in-out infinite;
}

.process__step.is-visible .process__shine--1 { animation-delay: 1.5s; }
.process__step.is-visible .process__shine--2 { animation-delay: 2s; }

@keyframes shineSparkle {
  0%, 100% { opacity: 0; transform: scale(0.6); }
  30% { opacity: 1; transform: scale(1.2); }
  60% { opacity: 0.5; transform: scale(1); }
}

/* ---------- コンテンツカード（グラスモーフィズム） ---------- */
.process__step-content {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-md);
  padding: 1rem 1.125rem;
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.7s var(--ease-out),
    transform 0.7s var(--ease-out),
    box-shadow 0.4s var(--ease-out);
  min-width: 0;
  box-shadow:
    0 4px 16px rgba(0, 99, 138, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

@media (min-width: 480px) {
  .process__step-content {
    border-radius: var(--radius-lg);
    padding: var(--space-3);
  }
}

@media (min-width: 768px) {
  .process__step-content {
    padding: var(--space-4);
  }
}

.process__step.is-visible .process__step-content {
  opacity: 1;
  transform: translateY(0);
}

/* ホバー時にカードが浮き上がる */
.process__step-content:hover {
  background: rgba(255, 255, 255, 0.9);
  box-shadow:
    0 12px 40px rgba(34, 190, 240, 0.15),
    0 4px 16px rgba(0, 99, 138, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  transform: translateY(-4px);
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .process__step-content {
    background: rgba(255, 255, 255, 0.95);
  }
}

.process__step-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-accent-sky);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.process__step-title {
  font-family: var(--font-heading);
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  letter-spacing: -0.005em;
}

.process__step-desc {
  font-size: var(--fs-small);
  color: var(--color-text-sub);
  line-height: 1.85;
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .process__step-content {
    opacity: 1;
    transform: none;
  }

  .process::before,
  .process::after,
  .process__steps::after,
  .process__step-marker::before,
  .process__step-marker::after,
  .process__icon-particles circle,
  .process__icon-clean circle,
  .process__icon-cloud,
  .process__drop,
  .process__icon-funnel line,
  .process__flow-drop,
  .process__icon-rotate,
  .process__icon-center,
  .process__ray,
  .process__spark,
  .process__water-fill,
  .process__shine {
    animation: none !important;
  }
}