/* ── S4 Layout ── */
.s4-section-label { font-size: 13px; }

#s4 {
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  padding: var(--section-padding-v) 0;
}

/* ── Tab Row ── */
.s4-tab-row {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  max-width: 984px;
  width: 100%;
  margin: var(--sp-6) auto var(--sp-5);
}


.s4-tab-btn {
  padding: 10px 40px;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.22em;
  border: 0.5px solid var(--s-divider);
  background: transparent;
  color: var(--s-dim);
  cursor: pointer;
  transition: background 0.3s, border-color 0.3s, color 0.3s;
}

.s4-tab-btn.active {
  background: var(--color-muted-amber);
  border-color: var(--color-muted-amber);
  color: #fff;
}

.s4-hint-spacer {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.06em;
  white-space: nowrap;
  visibility: hidden;
  margin-right: 8px;
}

.s4-after-hint {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: 11px;
  color: var(--s-dim);
  letter-spacing: 0.06em;
  transition: opacity 0.4s;
  white-space: nowrap;
  margin-left: 8px;
}

.s4-hint-arrow { animation: s4ArrowBounce 1.2s ease-in-out infinite; }
@keyframes s4ArrowBounce {
  0%, 100% { transform: translateX(0); }
  50%       { transform: translateX(-5px); }
}

.s4-after-hint.hidden { opacity: 0; pointer-events: none; }

/* ── 2×2 Grid ── */
.s4-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--s-divider);
  border: 1px solid var(--s-divider);
  max-width: 984px;
  margin: 0 auto;
}

/* ── Card ── */
.s4-card {
  background: var(--color-navy-beige);
  display: flex;
  flex-direction: column;
}

.s4-card-header {
  padding: 14px 18px;
  border-bottom: 0.5px solid var(--s-divider);
  background: rgba(0, 0, 0, 0.15);
  min-height: 72px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.s4-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.s4-case-name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 400;
  color: var(--s-text);
  letter-spacing: 0.05em;
}

.s4-case-badge {
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.22em;
  padding: 5px 14px;
  font-weight: 500;
  transition: all 0.4s;
}

.s4-badge-before { background: rgba(245, 240, 232, 0.1);  color: var(--s-dim); }
.s4-badge-after  { background: rgba(196, 149, 58, 0.2); color: var(--color-muted-amber); }

.s4-case-meta {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--s-dim);
  letter-spacing: 0.06em;
}

.s4-header-delta {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #6aacf0;
  margin-top: 6px;
  animation: s4DeltaBlink 0.8s ease-in-out 5;
}

@keyframes s4DeltaBlink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.s4-highlight-tag {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--color-muted-amber);
  margin-top: 4px;
  height: 18px;
  opacity: 0;
  transition: opacity 0.4s;
}
.s4-highlight-tag.on { opacity: 1; }

/* ── Chart Area ── */
.s4-chart-area {
  padding: 16px 18px 18px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.s4-state-header {
  display: grid;
  grid-template-columns: 56px 1fr 1fr 1fr 1fr 1fr;
  margin-bottom: 12px;
}

.s4-sh-item {
  font-family: var(--font-body);
  font-size: 9px;
  letter-spacing: 0.06em;
  text-align: center;
  color: var(--s-dim);
  padding: 3px 0;
}
.s4-sh-item:first-child { text-align: left; }
.s4-sh-나쁨 { background: rgba(220, 80,  60,  0.30); }
.s4-sh-저조 { background: rgba(230, 140, 60,  0.26); }
.s4-sh-보통 { background: rgba(200, 180, 60,  0.24); }
.s4-sh-양호 { background: rgba(60,  180, 130, 0.24); }
.s4-sh-좋음 { background: rgba(40,  140, 100, 0.28); }

.s4-bars-wrap {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  justify-content: space-between;
}

.s4-bar-row {
  display: flex;
  align-items: center;
  padding: 3px 4px;
}

.s4-bar-row.sleep-row {
  background: rgba(74, 144, 226, 0.08);
  border: 0.5px solid rgba(74, 144, 226, 0.2);
  margin-left: -4px;
  padding-left: 4px;
}

.s4-bar-label {
  width: 56px;
  font-family: var(--font-body);
  font-size: 10px;
  color: var(--s-dim);
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.s4-bar-row.sleep-row .s4-bar-label { color: #6aacf0; font-weight: 600; font-size: 11px; }

.s4-bar-track {
  flex: 1;
  height: 20px;
  position: relative;
  background: rgba(245, 240, 232, 0.06);
  overflow: visible;
}

.s4-bar-fill {
  position: absolute;
  left: 0; top: 0;
  height: 100%;
  overflow: hidden;
  transition: width 0.85s var(--ease-calm);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  min-width: 0;
}

.s4-bar-fill--after {
  justify-content: space-between;
}

.s4-bar-val {
  font-family: var(--font-body);
  font-size: 9px;
  font-weight: 500;
  color: #fff;
  padding-right: 5px;
  white-space: nowrap;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.s4-bar-change {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 700;
  color: #fff;
  padding-left: 6px;
  white-space: nowrap;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  letter-spacing: 0.04em;
}

/* Sleep Glow */
.s4-sleep-glow {
  position: absolute;
  right: -9px; top: 50%;
  transform: translateY(-50%);
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #4a90e2;
  box-shadow: 0 0 6px 2px rgba(74, 144, 226, 0.5);
  animation: s4GlowPulse 1.8s ease-in-out infinite;
  opacity: 0;
  transition: opacity 0.6s 0.8s;
}
.s4-sleep-glow.on { opacity: 1; }

@keyframes s4GlowPulse {
  0%, 100% { box-shadow: 0 0 4px 2px rgba(74,144,226,0.4); transform: translateY(-50%) scale(1); }
  50%       { box-shadow: 0 0 12px 5px rgba(74,144,226,0.7); transform: translateY(-50%) scale(1.3); }
}

.s4-sleep-delta {
  display: block;
  padding-left: 60px;
  margin-top: 4px;
  margin-bottom: 2px;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  color: #6aacf0;
  opacity: 0;
  transition: opacity 0.6s 1s;
  white-space: nowrap;
}
.s4-sleep-delta.on { opacity: 1; }

/* ── Measure Note ── */
.s4-measure-note {
  text-align: center;
  margin-top: var(--sp-3);
  font-family: var(--font-body);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--s-dim);
}

/* ── Reviews Header ── */
.s4-reviews-header {
  max-width: 680px;
  width: 100%;
  margin: var(--sp-10) auto 0;
  padding: 0 var(--container-px);
}

.s4-reviews-title {
  font-family: var(--font-body);
  font-size: 20px;
  letter-spacing: 0.14em;
  color: var(--s-accent);
  margin-bottom: 8px;
}

.s4-reviews-divider {
  border: none;
  border-top: 1px solid var(--s-divider);
  margin: 0;
}

/* ── Reviews ── */
.s4-reviews {
  max-width: 680px;
  margin: 0 auto 0;
  padding: 0 var(--container-px);
  width: 100%;
}

.s4-review {
  padding: var(--sp-6) 0;
  border-top: 0.5px solid var(--s-divider);
}
.s4-review:first-child { border-top: none; }

.s4-review-text {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 26px);
  font-weight: 300;
  line-height: 1.9;
  letter-spacing: 0.02em;
  color: var(--s-text);
}

.s4-review-line { display: block; }

.s4-review-meta {
  margin-top: var(--sp-3);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.s4-review-stars {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--s-accent);
}

.s4-review-author {
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--s-accent);
}

.s4-review-date {
  font-family: var(--font-body);
  font-size: 10px;
  color: var(--s-dim);
  letter-spacing: 0.1em;
}