/* ============================================
   BIOCESS - Science Page Styles
   ============================================ */

/* --- Science Hero --- */
.science-hero {
  padding: 10rem 0 6rem;
  background: linear-gradient(160deg, #0a2e1e 0%, #1a5c3a 60%, #2d7a52 100%);
  position: relative;
  overflow: hidden;
}

.science-hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/science-waves.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.12;
}

.science-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: white;
  max-width: 800px;
  margin: 0 auto;
}

/* --- HA Guide Section --- */
#ha-guide {
  padding: 7rem 0;
  background: var(--color-white);
}

.ha-guide-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.ha-image-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}

.ha-image-wrap img {
  width: 100%;
  height: 580px;
  object-fit: cover;
}

.ha-image-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(15,55,38,0.9), transparent);
  padding: 3rem 2rem 2rem;
  color: white;
}

.ha-guide-text {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 2;
}

.ha-guide-text h4 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--color-text);
  margin: 1.8rem 0 0.6rem;
}

.ha-guide-text h4:first-of-type { margin-top: 0; }

/* --- Molecular Weight Comparison --- */
#molecular-weights {
  padding: 7rem 0;
  background: var(--color-bg-alt);
}

.mw-cards {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin-top: 4rem;
}

.mw-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 2rem 1.2rem;
  text-align: center;
  border: 1px solid var(--color-border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.mw-card::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  transform: scaleX(0);
  transition: var(--transition);
}

.mw-card:hover::before { transform: scaleX(1); }

.mw-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.mw-size-indicator {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.mw-type {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
  margin-bottom: 0.4rem;
}

.mw-name {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.4rem;
}

.mw-kda {
  font-size: 0.72rem;
  color: var(--color-text-light);
  margin-bottom: 0.8rem;
}

.mw-action {
  font-size: 0.78rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

.mw-depth-bar {
  height: 4px;
  border-radius: var(--radius-full);
  margin-top: 1rem;
  background: var(--color-primary-light);
  position: relative;
}

.mw-depth-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--color-primary-dark);
  transition: width 1.5s ease;
}

/* --- Science Article --- */
#science-article {
  padding: 7rem 0;
  background: var(--color-white);
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 5rem;
  align-items: start;
}

.article-content h3 {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--color-text);
  margin: 2.5rem 0 1rem;
}

.article-content h3:first-child { margin-top: 0; }

.article-content p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 2;
  margin-bottom: 1.2rem;
}

.article-content ul {
  margin: 0 0 1.2rem 1.5rem;
  list-style: none;
}

.article-content ul li {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 0.5rem;
  padding-left: 1.2rem;
  position: relative;
}

.article-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

.article-highlight {
  background: linear-gradient(135deg, #f0f8f4, #e8f5ef);
  border-left: 4px solid var(--color-primary-dark);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.5rem 2rem;
  margin: 2rem 0;
}

.article-highlight p {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-primary-dark);
  font-style: italic;
  margin: 0;
}

/* Sidebar */
.article-sidebar {
  position: sticky;
  top: 100px;
}

.sidebar-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
}

.sidebar-card-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
  margin-bottom: 1rem;
}

.sidebar-nav-list { display: flex; flex-direction: column; gap: 0.5rem; }
.sidebar-nav-list a {
  font-size: 0.85rem;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}
.sidebar-nav-list a:hover,
.sidebar-nav-list a.active { color: var(--color-primary-dark); }
.sidebar-nav-list a::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-border);
  flex-shrink: 0;
  transition: var(--transition);
}
.sidebar-nav-list a:hover::before,
.sidebar-nav-list a.active::before { background: var(--color-primary-dark); }

/* --- K-Beauty Innovation --- */
#kbeauty {
  padding: 7rem 0;
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
}

.kbeauty-timeline {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  max-width: 700px;
  margin: 4rem auto 0;
  position: relative;
}

.kbeauty-timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-primary-dark));
}

.kbeauty-item {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  padding-left: 0;
}

.kbeauty-dot {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--color-white);
  border: 2px solid var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-primary-dark);
  font-size: 1rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  z-index: 1;
}

.kbeauty-item-content h4 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--color-text);
  margin-bottom: 0.3rem;
}

.kbeauty-item-content p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* === RESPONSIVE === */
@media (max-width: 1100px) {
  .mw-cards { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .ha-guide-inner { grid-template-columns: 1fr; }
  .ha-image-wrap img { height: 350px; }
  .mw-cards { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
}

@media (max-width: 480px) {
  .mw-cards { grid-template-columns: 1fr; }
}