:root {
  --bg: #050814;
  --bg-elevated: #111627;
  --bg-soft: #181f33;
  --accent: #5cb4ff;
  --accent-soft: rgba(92, 180, 255, 0.15);
  --accent-strong: #8bcbff;
  --text-main: #f5f7ff;
  --text-muted: #c0c4d8;
  --border-soft: rgba(255, 255, 255, 0.06);
  --shadow-soft: 0 18px 40px rgba(0, 0, 0, 0.45);
  --radius-xl: 22px;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --gap-lg: 24px;
  --gap-md: 16px;
  --gap-sm: 10px;
  --transition-fast: 0.18s ease-out;
  --transition-med: 0.26s ease-out;
  --content-width: 1280px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at top, #151a30 0, #050814 55%, #020308 100%);
  color: var(--text-main);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

html {
  background-color: #050814;
  overflow-x: hidden;
}

body {
  background-color: #050814;
  min-height: 100vh;
  overflow-x: hidden;
}

/* -------------------------------------------------- */
/* Header / Footer */
/* -------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: linear-gradient(
    to bottom,
    rgba(5, 8, 20, 0.96),
    rgba(5, 8, 20, 0.72)
  );
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.site-header-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 16px 20px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.site-title {
  margin: 0;
  font-size: 1.4rem;
  letter-spacing: 0.03em;
}

.site-subtitle {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.site-main {
  flex: 1;
  max-width: var(--content-width);
  width: 100%;
  margin: 0 auto;
  padding: 20px;
}

.site-footer {
  padding: 12px 20px 18px;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  background: radial-gradient(circle at top, #19213b 0, #050814 50%);
}

/* -------------------------------------------------- */
/* Generic content containers */
/* -------------------------------------------------- */

.content-section {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.02),
    rgba(92, 180, 255, 0.02)
  );
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-soft);
  padding: 20px 18px 22px;
  box-shadow: var(--shadow-soft);
}

.section-title {
  margin: 0 0 16px;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.section-title::before {
  content: "";
  width: 6px;
  height: 18px;
  border-radius: 999px;
  background: linear-gradient(to bottom, var(--accent-strong), #ff9ab5);
}

/* -------------------------------------------------- */
/* Links / Buttons */
/* -------------------------------------------------- */

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-strong);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.back-link:hover {
  color: var(--accent-strong);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(12, 17, 35, 0.9);
  color: var(--text-main);
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast);
}

.btn-icon {
  width: 16px;
  height: 16px;
  display: inline-block;
  flex-shrink: 0;
  object-fit: contain;
}

.btn-primary {
  background: radial-gradient(circle at top left, #7ed0ff, #3c7dff);
  border-color: rgba(149, 214, 255, 0.6);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.5);
}

/* -------------------------------------------------- */
/* Home: category grid */
/* -------------------------------------------------- */

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--gap-lg);
}

.category-card {
  position: relative;
  padding: 14px 12px 14px;
  border-radius: var(--radius-lg);
  background: radial-gradient(
    circle at top left,
    rgba(92, 180, 255, 0.16),
    rgba(9, 13, 32, 0.96)
  );
  border: 1px solid var(--border-soft);
  cursor: pointer;
  overflow: hidden;
  transition: transform var(--transition-med),
    box-shadow var(--transition-med),
    border-color var(--transition-med),
    background var(--transition-med);
}

.category-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at top right,
    rgba(252, 220, 255, 0.12),
    transparent 55%
  );
  opacity: 0;
  z-index: 1;
  pointer-events: none;
  transition: opacity var(--transition-med);
}

.category-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--category-hover-image, none);
  background-size: cover;
  background-position: center;
  opacity: 0;
  z-index: 0;
  pointer-events: none;
  transition: opacity var(--transition-med), transform var(--transition-med);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.55);
  border-color: rgba(255, 255, 255, 0.18);
}

.category-card:hover::before {
  opacity: 0;
}

.category-card:hover::after {
  opacity: 1;
  transform: scale(1.02);
}

.category-card:focus-visible::after {
  opacity: 0.4;
  transform: scale(1.02);
}

.category-card > * {
  position: relative;
  z-index: 2;
  transition: opacity var(--transition-med);
}

.category-card:hover > * {
  opacity: 0;
}

.category-name {
  font-size: 1rem;
  margin-bottom: 6px;
}

.category-count {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.category-updated {
  margin-top: 4px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.category-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.category-pill {
  font-size: 0.74rem;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  background: rgba(5, 9, 25, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--accent-strong);
}

/* -------------------------------------------------- */
/* Category page meta */
/* -------------------------------------------------- */

.category-meta {
  margin-bottom: 16px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* -------------------------------------------------- */
/* Gallery grid */
/* -------------------------------------------------- */

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(256px, 1fr));
  gap: var(--gap-lg);
}

.image-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  border: 1px solid var(--border-soft);
  background: #050814;
  transition: transform var(--transition-med),
    box-shadow var(--transition-med),
    border-color var(--transition-med);
}

.image-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.6);
  border-color: rgba(255, 255, 255, 0.2);
}

.image-thumb-wrapper {
  position: relative;
  overflow: hidden;
}

/* 16:9 thumbnail box */
.image-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  position: relative;
  background: radial-gradient(circle at center, #1a2239, #050814 70%);
  overflow: hidden;
}

.image-thumb img {
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
  /* contain = show full image, allow letterboxing */
  object-fit: contain;
  transition: transform 0.6s ease-out;
}

.image-card:hover .image-thumb img {
  transform: scale(1.03);
}

.image-badge {
  position: absolute;
  left: 8px;
  top: 8px;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  background: rgba(5, 8, 20, 0.84);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.image-year {
  position: absolute;
  right: 8px;
  bottom: 8px;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  background: rgba(5, 8, 20, 0.78);
}

.image-card-body {
  padding: 9px 11px 11px;
}

.image-title {
  margin: 0 0 4px;
  font-size: 0.9rem;
}

.image-desc {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  max-height: 2.4em;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* -------------------------------------------------- */
/* Detail layout */
/* -------------------------------------------------- */

.detail-layout {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.detail-image-panel {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: #050814;
  border: 1px solid rgba(255, 255, 255, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
}

.detail-image-panel img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
}

.detail-meta-panel {
  border-radius: var(--radius-xl);
  background: radial-gradient(
    circle at top left,
    rgba(92, 180, 255, 0.14),
    rgba(5, 8, 20, 0.96)
  );
  border: 1px solid var(--border-soft);
  padding: 14px 14px 18px;
}

.detail-title {
  margin: 0 0 6px;
  font-size: 1rem;
}

.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 0.78rem;
}

.detail-tag {
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  background: rgba(5, 9, 25, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--accent-strong);
}

.detail-desc {
  font-size: 0.9rem;
  color: var(--text-main);
  white-space: pre-wrap;
}

/* -------------------------------------------------- */
/* Errors */
/* -------------------------------------------------- */

.error-message {
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  background: rgba(255, 85, 85, 0.08);
  border: 1px solid rgba(255, 120, 120, 0.3);
  color: #ffd0d0;
  font-size: 0.86rem;
}

/* -------------------------------------------------- */
/* Responsive tweaks */
/* -------------------------------------------------- */

@media (max-width: 768px) {
  .site-main {
    padding: 16px;
  }

  .content-section {
    padding: 16px 14px 18px;
  }
}