/* ═══════════════════════════════════════════════
   Tailwind CSS 毛玻璃问答社区 - 设计系统
   现代轻量化 · 毛玻璃 · 自定义组件
   ═══════════════════════════════════════════════ */

/* ── Glassmorphism Custom Styles ── */
.glass {
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.10);
}

.glass-card {
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 1.25rem;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.15);
  transform: translateY(-3px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.glass-card .glass-card-body {
  padding: 1.5rem;
}

.glass-card-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.glass-card-header i {
  font-size: 1rem;
  color: rgba(255,255,255,0.6);
}

.glass-card-header h2,
.glass-card-header h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  margin: 0;
  letter-spacing: -0.01em;
}

/* ── Navbar ── */
.glass-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15,23,42,0.8);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  min-height: 64px;
}

/* ── Hero Search ── */
.glass-hero {
  background: linear-gradient(135deg, rgba(99,102,241,0.15) 0%, rgba(139,92,246,0.1) 50%, rgba(236,72,153,0.08) 100%);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.glass-hero .search-glass {
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 1rem;
  display: flex;
  align-items: center;
  transition: all 0.25s;
}

.glass-hero .search-glass:focus-within {
  border-color: rgba(99,102,241,0.5);
  background: rgba(255,255,255,0.08);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.15);
}

.glass-hero .search-glass input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 0.9rem 1.25rem;
  font-size: 1rem;
  color: rgba(255,255,255,0.9);
  outline: none;
  min-width: 0;
}

.glass-hero .search-glass input::placeholder {
  color: rgba(255,255,255,0.3);
}

.glass-hero .search-glass button {
  padding: 0.9rem 1.5rem;
  background: linear-gradient(135deg, #6366F1, #8B5CF6);
  border: none;
  border-radius: 0.75rem;
  margin: 4px;
  color: #fff;
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.glass-hero .search-glass button:hover {
  background: linear-gradient(135deg, #4F46E5, #7C3AED);
  transform: scale(1.02);
}

/* ── Glass Tags ── */
.glass-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
  backdrop-filter: blur(8px);
  border: 1px solid;
}

.glass-tag-featured {
  background: rgba(251,191,36,0.15);
  border-color: rgba(251,191,36,0.3);
  color: #FCD34D;
}

.glass-tag-hot {
  background: rgba(239,68,68,0.15);
  border-color: rgba(239,68,68,0.3);
  color: #FCA5A5;
}

.glass-tag-latest {
  background: rgba(52,211,153,0.15);
  border-color: rgba(52,211,153,0.3);
  color: #6EE7B7;
}

.glass-tag-default {
  background: rgba(99,102,241,0.15);
  border-color: rgba(99,102,241,0.3);
  color: #A5B4FC;
}

/* ── Sidebar List ── */
.glass-sidebar-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.glass-sidebar-list .glass-sidebar-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.glass-sidebar-list .glass-sidebar-item:last-child { border-bottom: none; }

.glass-sidebar-list .glass-sidebar-item .sidebar-dot {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: rgba(99,102,241,0.15);
  color: #A5B4FC;
  font-size: 0.65rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.glass-sidebar-list .glass-sidebar-item a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: 0.88rem;
  line-height: 1.45;
  transition: color 0.2s;
  display: block;
}

.glass-sidebar-list .glass-sidebar-item a:hover { color: #A5B4FC; }
.glass-sidebar-list .glass-sidebar-item .sidebar-date {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.3);
  margin-top: 2px;
}

/* ── Meta line ── */
.glass-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  margin-bottom: 1rem;
}

.glass-meta span { display: inline-flex; align-items: center; gap: 0.35rem; }
.glass-meta i { color: rgba(99,102,241,0.6); }

/* ── Article Content ── */
.glass-article {
  font-size: 0.95rem;
  line-height: 1.75;
  color: rgba(255,255,255,0.75);
}

.glass-article p { margin-bottom: 0.9rem; }

.glass-article img {
  max-width: 100%;
  border-radius: 0.75rem;
  margin: 1rem 0;
}

/* ── Answer Item ── */
.glass-answer {
  padding: 1rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.glass-answer:last-child { border-bottom: none; }

.glass-answer .answer-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.glass-answer .answer-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(99,102,241,0.3);
}

.glass-answer .answer-name {
  font-weight: 600;
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
}

.glass-answer .answer-time {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.35);
}

.glass-answer .answer-text {
  font-size: 0.9rem;
  line-height: 1.65;
  color: rgba(255,255,255,0.65);
}

.glass-answer .like-btn {
  margin-left: auto;
  border: 1px solid rgba(99,102,241,0.2);
  background: rgba(99,102,241,0.08);
  border-radius: 0.5rem;
  padding: 0.3rem 0.7rem;
  font-size: 0.8rem;
  color: #A5B4FC;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.glass-answer .like-btn:hover {
  background: rgba(99,102,241,0.2);
  border-color: rgba(99,102,241,0.4);
}

/* ── Footer ── */
.glass-footer {
  background: rgba(15,23,42,0.9);
  backdrop-filter: blur(16px);
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 2rem 0 1.5rem;
  margin-top: 4rem;
  color: rgba(255,255,255,0.5);
  font-size: 0.85rem;
}

.glass-footer h5 { color: rgba(255,255,255,0.8); font-weight: 700; }
.glass-footer a { color: rgba(255,255,255,0.4); text-decoration: none; }
.glass-footer a:hover { color: #A5B4FC; }

/* ── Back to Top ── */
.glass-btt {
  position: fixed;
  bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  right: calc(24px + env(safe-area-inset-right, 0px));
  width: 48px; height: 48px;
  display: none;
  align-items: center; justify-content: center;
  background: rgba(99,102,241,0.2);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: 50%;
  color: #A5B4FC;
  font-size: 1rem;
  cursor: pointer;
  z-index: 1000;
  transition: all 0.25s;
}

.glass-btt:hover {
  background: rgba(99,102,241,0.35);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(99,102,241,0.3);
}

/* ── Responsive ── */
@media (max-width: 767px) {
  .glass-card-body { padding: 1.125rem; }
  .glass-hero .search-glass { flex-direction: column; }
  .glass-hero .search-glass button {
    width: calc(100% - 8px);
    margin: 0 4px 4px;
  }
}

/* ── Accessibility ── */
:focus-visible {
  outline: 2px solid rgba(99,102,241,0.6);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; }
  .glass-card:hover { transform: none; }
}

/* ── Selection ── */
::selection { background: rgba(99,102,241,0.3); color: #fff; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }