:root {
  --bg-color: #FAFAFA;
  --text-primary: #111111;
  --text-secondary: #555555;
  --accent-color: #FF8BA0; /* Blackpink Pink */
  --border-color: #E5E5E5;
  --tag-bg: #E8F4EC;
  --tag-text: #1F7042;
  --white: #FFFFFF;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 40px;
  background: var(--white);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-logo { font-weight: 700; letter-spacing: 2px; }
.header-nav a {
  margin-left: 24px;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
}

/* Hero */
.hero {
  padding: 100px 24px;
  text-align: center;
  background: var(--white);
  border-bottom: 1px solid var(--border-color);
}
.hero-inner { max-width: 800px; margin: 0 auto; }
.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 100px;
  background: var(--bg-color);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 24px;
}
.hero-title {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}
.hero-title span { color: var(--accent-color); }
.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 48px;
}

/* Sponsor */
.sponsor-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.sponsor-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #888;
  font-weight: 600;
}
.sponsor-logos {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: center;
  margin-top: 8px;
}
.sponsor-logo {
  height: 40px;
  object-fit: contain;
}
.sponsor-logo.placeholder {
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  background: var(--border-color);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
}

/* Sections */
.section-header {
  margin-bottom: 40px;
}
.section-header h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}
.section-header p {
  font-size: 16px;
  color: var(--text-secondary);
}

/* Layout Two Column (Main + Sidebar) */
.layout-two-col {
  display: flex;
  gap: 48px;
  align-items: flex-start;
}
.main-content {
  flex: 1;
  min-width: 0;
}
.sidebar-content {
  width: 340px;
  flex-shrink: 0;
  position: sticky;
  top: 100px;
}
@media (max-width: 850px) {
  .layout-two-col { flex-direction: column; }
  .sidebar-content { width: 100%; position: static; }
}

/* Sidebar Card */
.sidebar-card {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.03);
}
.sidebar-card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}
.sidebar-card-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}
.sidebar-card-body {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Proof Points */
.proof-points-section {
  padding: 80px 0;
  background: var(--white);
  border-bottom: 1px solid var(--border-color);
}
.tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 48px;
}
.proof-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s ease;
}
.proof-tag:hover {
  background: #f0f0f0;
}
.proof-tag.active {
  background: var(--tag-bg);
  border-color: var(--tag-bg);
  color: var(--tag-text);
}
.proof-tag-count {
  background: var(--white);
  padding: 2px 6px;
  border-radius: 12px;
  font-size: 12px;
}

/* Accordion */
.accordion-item {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 16px;
  overflow: hidden;
  background: var(--white);
}
.accordion-header {
  padding: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  background: var(--white);
  transition: background 0.2s;
}
.accordion-header:hover {
  background: var(--bg-color);
}
.accordion-title {
  font-size: 18px;
  font-weight: 600;
}
.accordion-icon {
  font-size: 16px;
  color: var(--text-secondary);
  transition: transform 0.3s ease;
}
.accordion-item.active .accordion-icon {
  transform: rotate(180deg);
}
.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.accordion-item.active .accordion-body {
  max-height: 500px;
}
.accordion-content {
  padding: 0 24px 24px 24px;
  color: var(--text-secondary);
  font-size: 15px;
}
.accordion-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.mini-tag {
  font-size: 12px;
  padding: 4px 10px;
  background: var(--bg-color);
  border-radius: 100px;
  color: var(--text-secondary);
}

/* Gallery */
.gallery-section {
  padding: 80px 0;
  background: var(--bg-color);
}
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.gallery-item {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
  aspect-ratio: 4/5;
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.gallery-item:hover img {
  transform: scale(1.05);
}

/* Footer */
.site-footer {
  padding: 40px 0;
  text-align: center;
  background: var(--white);
  border-top: 1px solid var(--border-color);
  font-size: 13px;
  color: var(--text-secondary);
}

/* Carbon Journey */
.journey-section {
  padding: 80px 0;
  background: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
}
.journey-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
.journey-card {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.03);
}
.journey-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
}
@media(max-width: 600px) {
  .journey-card-header { flex-direction: column; gap: 12px; }
}
.journey-card-title {
  font-size: 20px;
  font-weight: 700;
}
.journey-card-stat {
  font-size: 32px;
  font-weight: 800;
  color: var(--accent-color);
}
.journey-card-stat span {
  font-size: 16px;
  color: var(--text-secondary);
  font-weight: 500;
}
.journey-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
}
.journey-table th, .journey-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
  font-size: 14px;
}
.journey-table th {
  color: var(--text-secondary);
  font-weight: 600;
  background: var(--bg-color);
}
.journey-table td.number {
  text-align: right;
  font-weight: 500;
}
.journey-toggle-btn {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 100px;
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
  color: var(--text-primary);
  transition: all 0.2s;
  display: inline-block;
  margin-top: 16px;
}
.journey-toggle-btn:hover { background: #E5E5E5; }
.journey-toggle-content {
  display: none;
  margin-top: 24px;
}
.journey-toggle-content.open { display: block; }

/* Reduction & Offset Inner Cards */
.reduction-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
  margin-top: 16px;
}
.reduction-item {
  background: var(--bg-color);
  padding: 16px;
  border-radius: 12px;
}
.reduction-item-title { font-weight: 600; font-size: 15px; margin-bottom: 4px; }
.reduction-item-metric { font-size: 13px; color: var(--text-secondary); }

.offset-box {
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 24px;
  border-radius: 12px;
  margin-top: 24px;
}
.offset-box p { font-size: 14px; line-height: 1.6; margin-bottom: 16px; }
.offset-participation {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
}
.offset-participation img {
  width: 100%;
  max-width: 300px;
  display: block;
  border-radius: 8px;
  margin: 16px 0 0;
  height: auto;
}
.participant-extra-link {
  display: inline-block;
  margin-top: 12px;
  color: var(--accent-color);
  text-decoration: underline;
  font-size: 13px;
  font-weight: 600;
}

/* Certificate Modal & Offset Card */
.modal {
  display: none; 
  position: fixed; 
  z-index: 9999; 
  left: 0; top: 0; width: 100%; height: 100%; 
  overflow: auto; 
  background-color: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
}
.modal-content {
  background-color: var(--white);
  margin: 10% auto; 
  padding: 24px;
  border-radius: 16px;
  width: 90%; 
  max-width: 600px;
  position: relative;
  box-shadow: 0 10px 40px rgba(0,0,0,0.15);
  animation: slideDown 0.3s ease-out;
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}
.close-btn {
  color: var(--text-secondary);
  float: right;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
}
.close-btn:hover { color: var(--text-primary); }

.offset-card {
  background: var(--bg-color);
  border-radius: 12px;
  padding: 24px;
  margin-top: 16px;
}
.offset-badge {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
}
.offset-details {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.8;
}
.offset-details .detail-item span {
  font-weight: 600;
  color: var(--text-secondary);
  display: inline-block;
  width: 50px;
}
.btn-cert {
  background: var(--text-primary);
  color: var(--white);
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 20px;
  transition: opacity 0.2s;
}
.btn-cert:hover { opacity: 0.8; }