/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --radius: 12px;
  --max-width: 1200px;
  --nav-height: 72px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  background: #1a1b1e;
  color: #e4e4e7;
  line-height: 1.7;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* Fixed background behind everything */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0;
  background: url('../images/banner-wugongshan.jpg') center 30% / cover no-repeat;
  pointer-events: none;
}

/* Very subtle dark overlay on the fixed background */
body::after {
  content: '';
  position: fixed; inset: 0; z-index: 0;
  background: rgba(0,0,0,0.05);
  pointer-events: none;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height);
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border-bottom: 1px solid transparent;
  transition: background 0.3s, backdrop-filter 0.3s, border-color 0.3s;
}

/* Post-page navbar state */
.navbar.scrolled {
  background: rgba(30,30,35,0.45);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,0.10);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto; padding: 0 24px;
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-brand {
  font-size: 18px; font-weight: 600; color: #fff;
}

.nav-links { display: flex; align-items: center; gap: 4px; }

.nav-link {
  padding: 8px 16px; border-radius: 8px;
  font-size: 14px; font-weight: 500;
  color: rgba(255,255,255,0.8);
  transition: color 0.2s, background 0.2s;
}

.nav-link:hover, .nav-link.active { color: #fff; background: rgba(255,255,255,0.12); }

.nav-search-btn {
  background: none; border: none; color: rgba(255,255,255,0.8);
  cursor: pointer; padding: 8px 10px; border-radius: 8px;
  margin-left: 4px; transition: background 0.2s, color 0.2s;
  display: flex; align-items: center;
}
.nav-search-btn:hover { background: rgba(255,255,255,0.12); color: #fff; }

/* ===== Search Modal ===== */
.search-modal {
  position: fixed; inset: 0; z-index: 2000;
  display: flex; align-items: flex-start; justify-content: center;
  padding-top: 120px;
  opacity: 0; visibility: hidden;
  transition: opacity 0.25s, visibility 0.25s;
}
.search-modal.open { opacity: 1; visibility: visible; }

.search-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
}

.search-dialog {
  position: relative; width: 90%; max-width: 520px; z-index: 1;
}

.search-input {
  width: 100%; padding: 16px 48px 16px 20px;
  font-size: 16px; color: #fff;
  background: rgba(40,40,45,0.9); border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px; outline: none;
  transition: border-color 0.2s;
}
.search-input::placeholder { color: rgba(255,255,255,0.35); }
.search-input:focus { border-color: rgba(255,255,255,0.3); }

.search-close {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: rgba(255,255,255,0.6);
  cursor: pointer; font-size: 18px; padding: 4px 8px;
}

/* Homepage fade-in */
.hero, .container, .footer {
  animation: pageFadeIn 0.6s ease both;
}

/* ===== Hero section ===== */
.hero {
  position: relative; z-index: 1;
  height: 100vh; min-height: 500px;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
}

.hero-title {
  font-family: 'LXGW WenKai', 'Noto Serif SC', serif;
  font-size: 28px; font-weight: 400; color: rgba(255,255,255,0.7);
  letter-spacing: 8px; margin-bottom: 16px;
  text-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.hero-subtitle {
  font-family: 'LXGW WenKai', 'Noto Serif SC', serif;
  font-size: 48px; color: #fff;
  font-weight: 400; letter-spacing: 6px;
  text-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.hero-scroll {
  position: absolute; bottom: 36px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.hero-scroll span {
  font-size: 12px; color: rgba(255,255,255,0.45);
  letter-spacing: 2px;
}
.hero-scroll .arrow {
  width: 22px; height: 22px;
  border-right: 2px solid rgba(255,255,255,0.4);
  border-bottom: 2px solid rgba(255,255,255,0.4);
  transform: rotate(45deg);
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: rotate(45deg) translate(0, 0); }
  50% { transform: rotate(45deg) translate(4px, 4px); }
}

/* ===== Main content ===== */
.container {
  position: relative; z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto; padding: 0 24px 80px;
}

/* ===== Post Grid ===== */
.post-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

/* ===== Post Card ===== */
.post-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.10);
  transition: transform 0.35s cubic-bezier(0.25,0.46,0.45,0.94),
              box-shadow 0.35s ease;
  cursor: pointer;
  display: block;
  aspect-ratio: 16 / 9;
  background: rgba(255,255,255,0.04);
}

/* Full-width featured card */
.post-card.featured {
  grid-column: 1 / -1;
  aspect-ratio: 21 / 9;
}

.post-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 40px rgba(255,255,255,0.12), 0 4px 16px rgba(0,0,0,0.08);
}

.post-card-thumb {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.25,0.46,0.45,0.94);
}

.post-card:hover .post-card-thumb { transform: scale(1.05); }

/* Light gradient overlay at bottom for text readability */
.post-card::after {
  content: '';
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(to top,
    rgba(0,0,0,0.35) 0%,
    rgba(0,0,0,0.12) 40%,
    transparent 65%
  );
}

/* Text overlaid on image, center-bottom */
.post-card-body {
  position: absolute; bottom: 0; left: 0; right: 0; z-index: 2;
  padding: 60px 24px 24px;
  text-align: center;
}

.post-card.featured .post-card-title { font-size: 24px; }

.post-card-title {
  font-size: 20px; font-weight: 600; color: #fff;
  margin-bottom: 8px; line-height: 1.3;
  text-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

.post-card-meta {
  font-size: 13px; color: rgba(255,255,255,0.6);
  text-align: center;
}

/* ===== No Results ===== */
.no-results {
  text-align: center; padding: 80px 20px;
  color: rgba(255,255,255,0.4); font-size: 16px;
}

/* ===== Post Page ===== */
.post-page {
  padding-top: calc(var(--nav-height) + 40px);
  animation: pageFadeIn 0.6s ease both;
}

@keyframes pageFadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.post-header {
  text-align: center; padding: 60px 24px 20px;
  position: relative; z-index: 1;
}
.post-header h1 {
  font-family: 'LXGW WenKai', 'Noto Serif SC', serif;
  font-size: 36px; font-weight: 400; letter-spacing: 4px;
  margin-bottom: 12px;
}
.post-header .post-meta { color: rgba(255,255,255,0.45); font-size: 14px; }

.post-gallery {
  max-width: 1200px; margin: 0 auto; padding: 20px 24px 80px;
  columns: 3; column-gap: 24px;
  position: relative; z-index: 1;
}

.post-gallery img {
  width: 100%; display: block;
  border-radius: 6px;
  margin-bottom: 24px;
  transition: transform 0.3s, box-shadow 0.3s, filter 0.6s ease, opacity 0.6s ease;
  cursor: pointer;
  background: rgba(255,255,255,0.03);
  filter: blur(10px);
  opacity: 0.6;
}

.post-gallery img.loaded {
  filter: blur(0);
  opacity: 1;
}

/* City divider */
.gallery-divider {
  column-span: all;
  text-align: center;
  padding: 32px 0 16px;
  font-family: 'LXGW WenKai', 'Noto Serif SC', serif;
  font-size: 20px;
  color: rgba(255,255,255,0.5);
  letter-spacing: 4px;
}

.post-gallery img:hover {
  transform: scale(1.015);
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

@media (max-width: 900px) {
  .post-gallery { columns: 2; }
}
@media (max-width: 600px) {
  .post-gallery { columns: 1; }
}

/* Lightbox */
.lightbox {
  position: fixed; inset: 0; z-index: 3000;
  background: rgba(0,0,0,0.94);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  cursor: pointer;
}
.lightbox.open { opacity: 1; visibility: visible; }

.lightbox img {
  max-width: 90vw; max-height: 90vh;
  border-radius: 4px; box-shadow: 0 8px 60px rgba(0,0,0,0.5);
  transform: scale(0.85); opacity: 0;
  transition: transform 0.35s ease, opacity 0.35s ease;
}
.lightbox.open img {
  transform: scale(1); opacity: 1;
}

.lightbox-close {
  position: absolute; top: 20px; right: 24px;
  background: none; border: none; color: #fff;
  font-size: 28px; cursor: pointer; z-index: 1;
}

.lightbox-nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(255,255,255,0.1); border: none; color: #fff;
  font-size: 32px; width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; cursor: pointer;
  transition: background 0.2s;
}
.lightbox-nav:hover { background: rgba(255,255,255,0.2); }
.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

/* ===== Footer ===== */
.footer {
  position: relative; z-index: 1;
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 40px 24px; text-align: center;
}

.social-links {
  margin-bottom: 16px; font-size: 14px;
}
.social-links a { color: rgba(255,255,255,0.5); transition: color 0.2s; }
.social-links a:hover { color: #fff; }
.social-divider { margin: 0 8px; color: rgba(255,255,255,0.25); }

.copyright { font-size: 13px; color: rgba(255,255,255,0.3); }

/* ===== Animations ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.post-card { animation: fadeInUp 0.6s ease both; }

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 999;
  width: 44px; height: 44px;
  background: rgba(50,50,55,0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 50%;
  color: #fff; font-size: 20px;
  cursor: pointer;
  opacity: 0; visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s, background 0.2s;
  display: flex; align-items: center; justify-content: center;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: rgba(60,60,65,0.85); transform: translateY(-2px); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero { min-height: 420px; }
  .hero-title { font-size: 30px; letter-spacing: 3px; }
  .hero-subtitle { font-size: 14px; }

  .post-grid { grid-template-columns: 1fr; gap: 20px; }
  .post-card.featured { aspect-ratio: 16 / 9; }

  .nav-link { padding: 6px 10px; font-size: 13px; }

  .post-header h1 { font-size: 26px; }
}