:root {
  --brand-primary: #0b1c7e;
  --brand-surface: #f8fbff;
  --brand-border: #dbeafe;
  --text-main: #1f2937;
  --text-muted: #64748b;
  --interaction-duration: 0.2s;
  --focus-ring: 2px solid var(--brand-primary);
}

body {
  color: var(--text-main);
  background: linear-gradient(180deg, #f8fbff 0%, #f4f8ff 100%);
}

a,
button {
  transition: color var(--interaction-duration) ease,
    background-color var(--interaction-duration) ease,
    border-color var(--interaction-duration) ease;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
}

.site-shell-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--brand-border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
}

.site-shell-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.site-shell-brand {
  font-size: 1.05rem;
  font-weight: 700;
  color: #111827;
  text-decoration: none;
}

.site-shell-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.site-shell-nav a {
  text-decoration: none;
  color: #334155;
  font-size: 0.95rem;
  padding: 6px 10px;
  border-radius: 999px;
}

.site-shell-nav a:hover {
  color: var(--brand-primary);
  background: var(--brand-surface);
}

.site-shell-nav a.active {
  color: #fff;
  background: var(--brand-primary);
}

.site-shell-footer {
  margin-top: 40px;
  border-top: 1px solid var(--brand-border);
  color: var(--text-muted);
  text-align: center;
  padding: 24px 16px;
}

.archive-main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.archive-section {
  background: #fff;
  border: 1px solid var(--brand-border);
  border-radius: 12px;
  padding: 20px;
}

.archive-subtitle {
  color: var(--text-muted);
  margin-top: 8px;
}

.archive-filter {
  margin: 14px 0 20px;
}

.archive-filter select {
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 6px 8px;
}

.timeline-month {
  border-left: 2px solid var(--brand-border);
  padding-left: 14px;
  margin-bottom: 18px;
}

.timeline-month h2 {
  font-size: 1rem;
  margin: 0 0 10px;
}

.timeline-month ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline-month li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 8px 12px;
  padding: 8px 0;
  border-bottom: 1px dashed #e2e8f0;
}

.timeline-type {
  font-size: 0.78rem;
  color: #0b1c7e;
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  padding: 2px 8px;
  background: #eff6ff;
  align-self: start;
}

.timeline-month li a {
  color: #1e293b;
  text-decoration: none;
}

.timeline-month li a:hover {
  color: #0b1c7e;
}

.timeline-date {
  color: #64748b;
  font-size: 0.86rem;
}

.timeline-tags {
  grid-column: 2 / -1;
  color: #94a3b8;
  font-size: 0.83rem;
}

.archive-empty {
  color: #64748b;
  margin: 8px 0;
}

.blog-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 8px 0 16px;
}

.blog-filter-bar .filter-title {
  font-size: 0.9rem;
  color: #64748b;
}

.filter-chip {
  border: 1px solid #cbd5e1;
  background: #fff;
  color: #334155;
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.85rem;
  cursor: pointer;
}

.filter-chip.active {
  background: #0b1c7e;
  border-color: #0b1c7e;
  color: #fff;
}

.content-hidden {
  display: none !important;
}

.podcast-toggle-button {
  margin-top: 12px;
  border: 1px solid #0b1c7e;
  background: transparent;
  color: #0b1c7e;
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
}

.scroll-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 42px;
  height: 42px;
  border: none;
  border-radius: 999px;
  background: #0b1c7e;
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: all 0.25s ease;
  z-index: 30;
}

.scroll-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.image-modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(11, 15, 25, 0.86);
  z-index: 200;
  padding: 28px;
}

.image-modal.open {
  display: flex;
}

.image-modal-content {
  max-width: min(960px, 92vw);
  max-height: 78vh;
  border-radius: 12px;
  object-fit: contain;
}

.image-modal-caption {
  position: absolute;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  color: #fff;
  font-size: 0.9rem;
}

.image-modal-close {
  position: absolute;
  top: 14px;
  right: 18px;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 24px;
  cursor: pointer;
}

.image-modal-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 38px;
  height: 38px;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
}

.image-modal-nav.prev {
  left: 18px;
}

.image-modal-nav.next {
  right: 18px;
}

body.modal-open {
  overflow: hidden;
}

.reveal-item {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.reveal-item.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 700px) {
  .site-shell-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .scroll-to-top {
    right: 16px;
    bottom: 16px;
  }
}