/* =============================================
   PROTOCOL PRODUCT PAGE
   ============================================= */
.protocol-hero {
  background: var(--bg);
  padding: 140px 0 80px;
  text-align: center;
}
.protocol-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.04;
  background-image: radial-gradient(circle, var(--primary-deep) 1px, transparent 1px);
  background-size: 24px 24px;
}
.protocol-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(36px, 5vw, 64px);
  color: var(--primary-deep);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}
.protocol-hero-sub {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 32px;
  line-height: 1.7;
}
.protocol-hero-manifesto {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 400;
  color: var(--bronze);
  max-width: 600px;
  margin: 0 auto;
  letter-spacing: -0.01em;
}

/* Visual Timeline */
.protocol-timeline-section {
  background: white;
  padding: 100px 0;
}
.protocol-timeline-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 44px);
  color: var(--text-primary);
  font-weight: 700;
  text-align: center;
  margin-bottom: 64px;
}

.protocol-phases {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}
/* Vertical line */
.protocol-phases::before {
  content: '';
  position: absolute;
  left: 32px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--highlight));
}

.protocol-phase {
  position: relative;
  padding-left: 80px;
  margin-bottom: 0;
}

/* Phase node circle */
.protocol-phase-node {
  position: absolute;
  left: 18px;
  top: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: white;
  border: 3px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  z-index: 1;
}
.protocol-phase:last-child .protocol-phase-node {
  border-color: var(--highlight);
  color: var(--highlight);
}

/* Accordion header */
.protocol-phase-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  background: var(--off-white);
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.3s;
  border: 1px solid var(--border-light);
  margin-bottom: 4px;
}
.protocol-phase-header:hover {
  background: white;
}
.protocol-phase-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}
.protocol-phase-timing {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}
.protocol-phase-toggle {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 14px;
  transition: transform 0.3s;
  flex-shrink: 0;
}
.protocol-phase--open .protocol-phase-toggle {
  transform: rotate(45deg);
}

/* Accordion body */
.protocol-phase-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-out);
}
.protocol-phase--open .protocol-phase-body {
  max-height: 500px;
}
.protocol-phase-content {
  padding: 20px 24px;
  background: white;
  border-radius: 0 0 12px 12px;
  border: 1px solid var(--border-light);
  border-top: none;
  margin-bottom: 20px;
}
.protocol-phase-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}
.protocol-phase-detail {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
}

/* Designed for Transfer */
.protocol-transfer {
  background: var(--off-white);
  padding: 100px 0;
}
.protocol-transfer-inner {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}
.protocol-transfer-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 44px);
  color: var(--text-primary);
  font-weight: 700;
  margin-bottom: 24px;
}
.protocol-transfer-text {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
}
.protocol-transfer-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  text-align: left;
}
.protocol-transfer-feature {
  background: white;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 2px 12px var(--shadow-neutral);
}
.protocol-transfer-feature-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.protocol-transfer-feature-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* =============================================
   RESPONSIVE STYLES
   ============================================= */

/* Tablets (968px and below) */
@media (max-width: 968px) {
  .protocol-hero {
    padding: 120px 0 60px;
  }
  .protocol-timeline-section,
  .protocol-transfer {
    padding: 80px 0;
  }
  .protocol-timeline-title {
    margin-bottom: 48px;
  }
  .protocol-phases {
    max-width: 100%;
  }
}

/* Tablets Portrait (768px and below) */
@media (max-width: 768px) {
  .protocol-hero {
    padding: 110px 0 50px;
  }
  .protocol-hero-sub {
    font-size: 16px;
    margin-bottom: 24px;
  }
  .protocol-hero-manifesto {
    font-size: 18px;
  }
  .protocol-timeline-section,
  .protocol-transfer {
    padding: 60px 0;
  }
  .protocol-timeline-title {
    margin-bottom: 40px;
  }
  .protocol-phases::before {
    left: 24px;
  }
  .protocol-phase {
    padding-left: 64px;
  }
  .protocol-phase-node {
    left: 10px;
  }
  .protocol-phase-header {
    padding: 16px 20px;
  }
  .protocol-phase-name {
    font-size: 16px;
  }
  .protocol-phase-content {
    padding: 16px 20px;
  }
  .protocol-phase-desc {
    font-size: 14px;
  }
  .protocol-transfer-title {
    margin-bottom: 20px;
  }
  .protocol-transfer-text {
    font-size: 15px;
    margin-bottom: 28px;
  }
  .protocol-transfer-feature {
    padding: 20px;
  }
}

/* Mobile (640px and below) */
@media (max-width: 640px) {
  .protocol-hero {
    padding: 100px 0 40px;
  }
  .protocol-hero-title {
    font-size: clamp(28px, 7vw, 36px);
  }
  .protocol-hero-sub {
    font-size: 15px;
    margin-bottom: 20px;
  }
  .protocol-hero-manifesto {
    font-size: 16px;
  }
  .protocol-timeline-section,
  .protocol-transfer {
    padding: 48px 0;
  }
  .protocol-timeline-title {
    font-size: clamp(24px, 5vw, 32px);
    margin-bottom: 32px;
  }
  .protocol-phases::before {
    left: 16px;
  }
  .protocol-phase {
    padding-left: 52px;
  }
  .protocol-phase-node {
    left: 2px;
    width: 26px;
    height: 26px;
    font-size: 11px;
  }
  .protocol-phase-header {
    padding: 14px 16px;
    border-radius: 10px;
    flex-wrap: wrap;
    gap: 8px;
  }
  .protocol-phase-name {
    font-size: 15px;
  }
  .protocol-phase-timing {
    font-size: 11px;
  }
  .protocol-phase-toggle {
    width: 24px;
    height: 24px;
    font-size: 12px;
  }
  .protocol-phase-content {
    padding: 14px 16px;
    border-radius: 0 0 10px 10px;
    margin-bottom: 16px;
  }
  .protocol-phase-desc {
    font-size: 13px;
    margin-bottom: 10px;
  }
  .protocol-phase-detail {
    font-size: 12px;
  }
  .protocol-transfer-title {
    font-size: clamp(24px, 5vw, 32px);
    margin-bottom: 16px;
  }
  .protocol-transfer-text {
    font-size: 14px;
    margin-bottom: 24px;
  }
  .protocol-transfer-features {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .protocol-transfer-feature {
    padding: 20px;
    border-radius: 12px;
  }
  .protocol-transfer-feature-title {
    font-size: 14px;
  }
  .protocol-transfer-feature-text {
    font-size: 13px;
  }
}

/* Small phones (480px and below) */
@media (max-width: 480px) {
  .protocol-hero {
    padding: 90px 0 36px;
  }
  .protocol-hero-title {
    font-size: clamp(24px, 7vw, 30px);
  }
  .protocol-phases::before {
    left: 12px;
  }
  .protocol-phase {
    padding-left: 44px;
  }
  .protocol-phase-node {
    left: 0;
    width: 24px;
    height: 24px;
    font-size: 10px;
    border-width: 2px;
  }
  .protocol-phase-header {
    padding: 12px 14px;
  }
  .protocol-phase-content {
    padding: 12px 14px;
  }
  .protocol-transfer-feature {
    padding: 16px;
  }
}