:root{
  --bg:#f5f5f5;
  --text:#222222;
  --muted:#666666;
  --border:#d2d2d2;
  --card-bg:#ffffff;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
}
.wrap{
  max-width:1120px;
  margin:0 auto;
  padding:72px 28px 96px;
}
.page-header{ margin-bottom:32px; }
.eyebrow{
  font-size:13px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--muted);
  margin-bottom:10px;
}
h1{
  margin:0 0 10px 0;
  font-size:48px;
  line-height:1.1;
}
.intro{
  max-width:760px;
  font-size:18px;
  margin:0 0 18px 0;
}
.top-nav a,
.filters button{
  color:inherit;
  text-decoration:none;
  border:1px solid var(--border);
  background:#fff;
  border-radius:10px;
  padding:7px 14px;
  font:inherit;
  font-size:13px;
  cursor:pointer;
  transition:border-color .15s ease;
}
.top-nav a:hover,
.filters button:hover{background:var(--bg);}
.toolbar{
  display:flex;
  gap:24px;
  flex-wrap:wrap;
  margin:32px 0 34px;
}
.filter-group{
  display:flex;
  flex-direction:column;
  gap:10px;
}
.label{
  color:var(--muted);
  font-size:14px;
  text-transform:uppercase;
  letter-spacing:.05em;
}
.filters{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}
.filters button.active{
  border-color:var(--text);
  background:var(--text);
  color:#fff;
}
.grid{
  align-items:start;
  display:grid;
  grid-template-columns: repeat(2, 520px);
  gap:24px;
  justify-content:start;
}
.card{
  width:520px;
  background:var(--card-bg);
  border:1px solid var(--border);
  border-radius:18px;
  overflow:hidden;
}
.card-image{
  width:100%;
  aspect-ratio: 16 / 10;
  object-fit:cover;
  display:block;
  background:#ddd;
}
.card-content{
  padding:18px 18px 20px;
}
.card-meta{
  color:var(--muted);
  font-size:14px;
  margin-bottom:8px;
}
.card-title{
  font-size:30px;
  line-height:1.2;
  margin:0 0 6px 0;
}
.card-title-link{
  cursor:pointer;
  transition:color .15s ease;
}
.card-title-link:hover{ color:var(--muted); }
.card-title-link:focus-visible{
  outline:2px solid var(--text);
  outline-offset:3px;
  border-radius:4px;
}
.card-title-cn{
  color:var(--muted);
  margin-bottom:12px;
}
.card-text-en{
  margin:0 0 10px 0;
}
.card-text-cn {
  border-top: 1px solid var(--border);
  margin-top: 1rem;
  padding-top: 1rem;
}
.card-tags{
  color:var(--muted);
  font-size:14px;
  margin-top:10px;
}
.card-link {
  display: inline-block;
  margin-top: 12px;
  border: 1px solid #a0c4e8;
  border-radius: 10px;
  padding: 7px 14px;
  color: #3a7ab5;
  background: linear-gradient(90deg, #fff 0%, #e8f4ff 30%, #d0e8ff 50%, #e8f4ff 70%, #fff 100%);
  background-size: 200% auto;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  animation: cardLinkShimmer 3s linear infinite;
}
.card-link:hover {
  animation: none;
  background: #e0f0ff;
  border-color: #3a7ab5;
  color: #1a5a95;
}
@keyframes cardLinkShimmer {
  0%   { background-position: 200% center; }
  100% { background-position: -200% center; }
}
.empty{
  color:var(--muted);
  font-size:18px;
  padding:16px 0;
}
@media (max-width: 768px){
  .grid{
    grid-template-columns: 1fr;
  }

  .card{
    width:100%;
    max-width:520px;
  }
}

/* ── Top nav & Auth area ──────────────────────────────────────────────────── */
.top-nav {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 18px;
}
.auth-area {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}
.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
}
.user-photo {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
}
.auth-btn {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 10px;
  padding: 7px 14px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  color: var(--text);
  transition: background .15s ease;
}
.auth-btn:hover { background: var(--bg); }
.auth-btn.logout { color: var(--muted); }

/* ── Card actions (Like + Comment toggle) ────────────────────────────────── */
.card-actions {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
.like-btn,
.comment-toggle-btn,
.share-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 14px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  color: var(--muted);
  transition: border-color .15s, color .15s, background .15s;
}
.like-btn:hover,
.comment-toggle-btn:hover,
.share-btn:hover {
  border-color: var(--text);
  color: var(--text);
}
.share-btn { margin-left: auto; }
.like-btn.liked {
  border-color: #e53935;
  color: #e53935;
  background: #fff5f5;
}
.like-icon,
.comment-icon { display: flex; align-items: center; }
.like-icon svg,
.comment-icon svg { width: 16px; height: 16px; }
/* Heart fills when liked — driven by class, no JS needed */
.like-btn.liked .like-icon svg { fill: currentColor; }

/* ── Comments section ────────────────────────────────────────────────────── */
.comments-section {
  margin-top: 14px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.comment-item {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}
.comment-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--border);
}
.comment-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.comment-author {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.comment-text {
  font-size: 14px;
  color: var(--text);
  line-height: 1.5;
}
.no-comments {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 12px;
}
.comment-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}
.comment-input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 12px;
  font: inherit;
  font-size: 14px;
  resize: vertical;
  background: var(--bg);
  color: var(--text);
}
.comment-input:focus {
  outline: none;
  border-color: var(--text);
}
.comment-submit-btn {
  align-self: flex-end;
  border: 1px solid var(--text);
  background: var(--text);
  color: #fff;
  border-radius: 10px;
  padding: 7px 18px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}
.comment-submit-btn:hover { opacity: .85; }
.comment-login-hint {
  font-size: 13px;
  color: var(--muted);
  margin-top: 8px;
}
.signin-link {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  font-size: inherit;
  color: var(--text);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.signin-link:hover { color: var(--muted); }

/* ── Load more button ────────────────────────────────────────────────────── */
.load-more-btn {
  display: block;
  margin: 36px auto 0;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 10px;
  padding: 7px 32px;
  font: inherit;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.load-more-btn:hover {
  background: var(--bg);
}

/* ── Hidden utility ──────────────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Language toggle ─────────────────────────────────────────────────────── */
body.lang-en .card-title-cn,
body.lang-en .card-text-cn  { display: none; }

body.lang-cn .card-title,
body.lang-cn .card-text-en  { display: none; }

/* In CN-only mode: CN title becomes the primary title */
body.lang-cn .card-title-cn {
  color: var(--text);
  font-size: 30px;
  line-height: 1.2;
  font-weight: 700;
  margin: 0 0 6px 0;
}
/* In CN-only mode: remove the separator line from CN text */
body.lang-cn .card-text-cn {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

/* ── Modal ──────────────────────────────────────────────────────────────── */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
  overflow-y: auto;
}
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  animation: modalFadeIn .2s ease;
}
.modal-dialog {
  position: relative;
  width: 100%;
  max-width: 560px;
  margin: auto;
  animation: modalSlideIn .25s ease;
}
.modal-body .card {
  width: 100%;
}
.modal-close {
  position: absolute;
  top: -14px;
  right: -14px;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 50%;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  color: var(--text);
  z-index: 2;
  transition: background .15s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}
.modal-close:hover { background: var(--bg); }
body.modal-open { overflow: hidden; }
@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes modalSlideIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (max-width: 600px) {
  .modal { padding: 20px 12px; }
  .modal-close { top: -10px; right: -10px; }
}

/* ── ② Modal prev/next navigation ───────────────────────────────────────── */
.modal-nav {
  display: flex;
  gap: 8px;
  position: absolute;
  top: -14px;
  right: 30px;
}
.modal-nav-btn {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 50%;
  font-size: 16px;
  cursor: pointer;
  color: var(--text);
  transition: background .15s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-nav-btn:hover:not(:disabled) { background: var(--bg); }
.modal-nav-btn:disabled { opacity: .35; cursor: default; }

/* ── ⑦ Back to top button ───────────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  color: var(--text);
  box-shadow: 0 2px 10px rgba(0,0,0,.12);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, background .15s ease;
  z-index: 900;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}
.back-to-top:hover { background: var(--bg); }

/* ── Toast (share fallback feedback) ───────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 14px;
  z-index: 1100;
  animation: toastFade 2.5s ease forwards;
}
@keyframes toastFade {
  0%   { opacity: 0; transform: translate(-50%, 10px); }
  15%  { opacity: 1; transform: translate(-50%, 0); }
  85%  { opacity: 1; transform: translate(-50%, 0); }
  100% { opacity: 0; transform: translate(-50%, -10px); }
}