/* ============================================================
   style.css — Qun-OpenClaw Use Cases
   苹果设计语言 | 响应式 | 动画 | 骨架屏
   ============================================================ */

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

:root {
  --bg:          #ffffff;
  --text:        #1d1d1f;
  --text-sub:    #6e6e73;
  --accent:      #0071e3;
  --accent-h:    #0077ed;
  --card-bg:     #f5f5f7;
  --sk-bg:       #e8e8ed;
  --sk-shine:    #f0f0f5;
  --nav-bg:      rgba(255,255,255,0.8);
  --shadow-card: 0 4px 20px rgba(0,0,0,0.07);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.13);
  --radius:      18px;
  --nav-h:       52px;
  --transition:  0.28s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display",
               "Helvetica Neue", Arial, "PingFang SC", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Page Transitions ── */
@keyframes fadeInScale {
  from { opacity: 0; transform: scale(0.985) translateY(6px); }
  to   { opacity: 1; transform: scale(1)     translateY(0);   }
}
@keyframes fadeOutScale {
  from { opacity: 1; transform: scale(1); }
  to   { opacity: 0; transform: scale(0.97); }
}

.page-enter { animation: fadeInScale 0.26s ease forwards; }
.page-exit  { animation: fadeOutScale 0.22s ease forwards; }

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  z-index: 100;
  transition: border-color var(--transition);
}
.nav.scrolled { border-color: rgba(0,0,0,0.1); }

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-logo {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-logo:hover { color: var(--accent); text-decoration: none; }

.nav-links {
  display: flex;
  gap: 20px;
  margin-left: auto;
}
.nav-links a {
  font-size: 0.875rem;
  color: var(--text-sub);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

.lang-btn {
  border: none;
  background: none;
  cursor: pointer;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 8px;
  transition: background var(--transition);
}
.lang-btn:hover { background: rgba(0,113,227,0.08); }

/* ── Hero ── */
.hero {
  margin-top: var(--nav-h);
  padding: 80px 24px 56px;
  text-align: center;
  background: linear-gradient(180deg, #fafafa 0%, #fff 100%);
}

.hero-inner { max-width: 680px; margin: 0 auto; }

.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 16px;
  color: var(--text);
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-sub);
  margin-bottom: 24px;
  line-height: 1.6;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--card-bg);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 0.9rem;
  color: var(--text-sub);
}
.hero-badge strong {
  color: var(--accent);
  font-size: 1.1rem;
}

/* ── Filter Section ── */
.filter-section {
  padding: 8px 0 24px;
  position: sticky;
  top: var(--nav-h);
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 50;
  border-bottom: 1px solid rgba(0,0,0,0.06);
}

.search-wrap {
  padding: 12px 24px 0;
  max-width: 1200px;
  margin: 0 auto;
}

.search-wrap input[type="search"] {
  width: 100%;
  max-width: 420px;
  padding: 9px 16px;
  border: 1.5px solid #d2d2d7;
  border-radius: 10px;
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  color: var(--text);
  background: #fff;
  transition: border-color var(--transition);
}
.search-wrap input:focus { border-color: var(--accent); }

.tab-bar {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  padding: 10px 24px 0;
  max-width: 1200px;
  margin: 0 auto;
}

.tab {
  border: none;
  background: none;
  cursor: pointer;
  font: inherit;
  font-size: 0.875rem;
  color: var(--text-sub);
  padding: 6px 14px;
  border-radius: 8px;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  white-space: nowrap;
}
.tab:hover { color: var(--text); background: rgba(0,0,0,0.04); }
.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

/* ── Card Grid ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 32px 0 64px;
}

@media (max-width: 1023px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 767px) {
  .card-grid { grid-template-columns: 1fr; gap: 16px; }
  .hero { padding: 60px 24px 40px; }
}

/* ── Card ── */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 22px 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
  role: listitem;
}
.card:hover {
  transform: scale(1.02) translateY(-4px);
  box-shadow: var(--shadow-hover);
}

/* 懒加载动画 */
.card-animate {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.card-animate.visible {
  opacity: 1;
  transform: translateY(0);
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(0,113,227,0.1);
  color: var(--accent);
  width: fit-content;
}

/* 各分类配色 */
[data-category="social-media"]          .badge,
.badge[data-category="social-media"]          { background: rgba(52,199,89,0.12);  color: #1d8a3a; }
[data-category="creative-building"]     .badge,
.badge[data-category="creative-building"]     { background: rgba(255,149,0,0.12);  color: #c96300; }
[data-category="infrastructure-devops"] .badge,
.badge[data-category="infrastructure-devops"] { background: rgba(88,86,214,0.12);  color: #4b48c8; }
[data-category="productivity"]          .badge,
.badge[data-category="productivity"]          { background: rgba(0,113,227,0.10);  color: #0064c8; }
[data-category="research-learning"]     .badge,
.badge[data-category="research-learning"]     { background: rgba(255,45,85,0.10);  color: #c41230; }
[data-category="finance-trading"]       .badge,
.badge[data-category="finance-trading"]       { background: rgba(100,100,100,0.1); color: #444; }

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
}

.card-sub {
  font-size: 0.8rem;
  color: var(--text-sub);
  line-height: 1.3;
}

.card-desc {
  font-size: 0.875rem;
  color: var(--text-sub);
  line-height: 1.55;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  margin-top: 4px;
  align-self: flex-start;
  transition: opacity var(--transition);
}
.card-link:hover { opacity: 0.75; text-decoration: none; }

/* ── Skeleton / Shimmer ── */
@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position:  200% 0; }
}

.card.skeleton {
  pointer-events: none;
  gap: 12px;
}

.sk-badge, .sk-title, .sk-sub, .sk-desc {
  border-radius: 8px;
  background: linear-gradient(90deg, var(--sk-bg) 25%, var(--sk-shine) 50%, var(--sk-bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

.sk-badge  { height: 20px; width: 72px; border-radius: 100px; }
.sk-title  { height: 20px; width: 85%; }
.sk-sub    { height: 14px; width: 60%; }
.sk-desc   { height: 14px; width: 100%; }
.sk-desc.short { width: 75%; }

/* ── No Results / Error ── */
.no-results, .error-msg {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px 24px;
  color: var(--text-sub);
  font-size: 1rem;
}
.error-msg { color: #c41230; }

/* ── Case Detail Layout ── */
.case-layout {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 48px;
  padding-top: calc(var(--nav-h) + 32px);
  padding-bottom: 64px;
  align-items: start;
}

@media (max-width: 900px) {
  .case-layout { grid-template-columns: 1fr; }
  .toc-panel { display: none; }
}

.breadcrumb {
  margin-top: calc(var(--nav-h) + 16px);
  font-size: 0.85rem;
  color: var(--text-sub);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid #e8e8ed;
}
.breadcrumb a { color: var(--accent); }
.crumb-sep { color: #c7c7cc; }
.crumb-current { color: var(--text); font-weight: 500; }

.case-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
  line-height: 1.2;
}

/* ── Prose ── */
.prose { max-width: 720px; }

.prose h1, .prose h2, .prose h3, .prose h4 {
  font-weight: 600;
  color: var(--text);
  margin: 2em 0 0.6em;
  line-height: 1.3;
}
.prose h1 { font-size: 1.7rem; }
.prose h2 { font-size: 1.3rem; border-bottom: 1px solid #e8e8ed; padding-bottom: 6px; }
.prose h3 { font-size: 1.1rem; }

.prose p  { margin: 0.9em 0; color: var(--text); font-size: 0.97rem; line-height: 1.75; }
.prose ul, .prose ol { margin: 0.8em 0 0.8em 1.4em; }
.prose li { margin: 0.3em 0; font-size: 0.95rem; line-height: 1.65; }

.prose pre {
  background: #f5f5f7;
  border-radius: 12px;
  padding: 18px 20px;
  overflow-x: auto;
  margin: 1.2em 0;
  font-size: 0.875rem;
}
.prose code:not(pre code) {
  background: #f0f0f5;
  border-radius: 5px;
  padding: 2px 6px;
  font-size: 0.88em;
  color: #c41230;
}

.prose blockquote {
  border-left: 3px solid var(--accent);
  padding: 8px 18px;
  margin: 1em 0;
  background: rgba(0,113,227,0.04);
  border-radius: 0 8px 8px 0;
  color: var(--text-sub);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.9rem;
}
.prose th { background: var(--card-bg); font-weight: 600; }
.prose th, .prose td {
  border: 1px solid #e0e0e5;
  padding: 8px 12px;
  text-align: left;
}

.prose img { max-width: 100%; border-radius: 10px; margin: 0.5em 0; }
.prose a   { color: var(--accent); }

/* ── GitHub Link ── */
.gh-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 40px;
  padding: 10px 20px;
  background: #1d1d1f;
  color: #fff !important;
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: opacity var(--transition);
  text-decoration: none;
}
.gh-link:hover { opacity: 0.8; text-decoration: none; }

/* ── TOC ── */
.toc-panel {
  position: sticky;
  top: calc(var(--nav-h) + 32px);
  max-height: calc(100vh - var(--nav-h) - 60px);
  overflow-y: auto;
  padding: 20px;
  background: var(--card-bg);
  border-radius: 14px;
}

.toc-heading {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-sub);
  margin-bottom: 12px;
}

#toc ul { list-style: none; padding: 0; }
.toc-item { margin: 2px 0; }
.toc-level-1 { padding-left: 12px; }
.toc-level-2 { padding-left: 24px; }

.toc-item a {
  display: block;
  font-size: 0.82rem;
  color: var(--text-sub);
  padding: 4px 8px;
  border-radius: 6px;
  line-height: 1.4;
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}
.toc-item a:hover  { color: var(--text); background: rgba(0,0,0,0.05); }
.toc-item a.active { color: var(--accent); font-weight: 600; }

/* ── Prose skeleton ── */
.sk-prose { display: flex; flex-direction: column; gap: 12px; margin-top: 16px; }
.sk-line {
  height: 16px;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--sk-bg) 25%, var(--sk-shine) 50%, var(--sk-bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
.sk-line:nth-child(2) { width: 90%; }
.sk-line:nth-child(3) { width: 95%; }
.sk-line:nth-child(4) { width: 80%; }
.sk-line:nth-child(5) { width: 92%; }
.sk-line:nth-child(6) { width: 65%; }

/* ── Buttons ── */
.btn-primary {
  display: inline-block;
  padding: 12px 28px;
  background: var(--accent);
  color: #fff;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  transition: background var(--transition);
}
.btn-primary:hover { background: var(--accent-h); text-decoration: none; color: #fff; }

/* ── Footer ── */
.footer {
  border-top: 1px solid #e8e8ed;
  padding: 20px 0;
}
.footer-inner {
  display: flex;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-sub);
  flex-wrap: wrap;
}
.footer-inner a { color: var(--text-sub); }
.footer-inner a:hover { color: var(--accent); }

/* ── Category Navigation ── */
.cat-nav { padding: 32px 0 24px; text-align: center; }
.cat-nav-inner { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.cat-btn {
  border: 1.5px solid #d2d2d7;
  background: #fff;
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  color: var(--text-sub);
  padding: 8px 20px;
  border-radius: 100px;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  white-space: nowrap;
}
.cat-btn:hover { color: var(--accent); border-color: var(--accent); background: rgba(0,113,227,0.05); }

/* ── Case Meta (Bilingual Info Block) ── */
.case-meta {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.case-meta-names {
  font-size: 1.05rem;
  font-weight: 600;
  padding-bottom: 10px;
  border-bottom: 1px solid #e8e8ed;
}
.case-meta-zh { color: var(--text); }
.case-meta-sep { color: #c7c7cc; margin: 0 6px; }
.case-meta-en { color: var(--text-sub); font-weight: 400; }
.case-meta-block { display: flex; flex-direction: column; gap: 4px; }
.case-meta-row {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 10px;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text);
}
.case-meta-row-en { color: var(--text-sub); font-size: 0.85rem; }
.case-meta-label {
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--text-sub);
  padding-top: 2px;
  white-space: nowrap;
}
.case-title-en {
  font-weight: 400;
  font-size: 0.65em;
  color: var(--text-sub);
  margin-left: 8px;
}