/* ================================================================
   教程中心页面样式 v2 — 全新设计
   ================================================================ */

/* ===== Hero ===== */
.tutorials-hero-v2 {
  position: relative; overflow: hidden;
  padding: 48px 24px 40px; text-align: center;
  margin-top: 64px;
  background: linear-gradient(180deg, rgba(245,158,11,.06) 0%, transparent 100%);
  border-bottom: 1px solid rgba(148,163,184,.08);
}
.tutorials-hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(ellipse 60% 40% at 50% 40%, rgba(245,158,11,.10), transparent 60%);
  pointer-events: none;
}
.tutorials-hero-content { position: relative; z-index: 1; max-width: 680px; margin: 0 auto; }
.tutorials-hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 14px; border-radius: 16px;
  background: rgba(245,158,11,.1); color: var(--accent-light);
  font-size: 12px; font-weight: 600; margin-bottom: 14px;
  border: 1px solid rgba(245,158,11,.15);
}
.tutorials-hero-title {
  font-size: 36px; font-weight: 800; margin-bottom: 10px;
  background: linear-gradient(135deg, #fff 0%, var(--accent-light) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; letter-spacing: -.5px;
}
.tutorials-hero-sub {
  font-size: 14px; color: var(--text-muted); margin-bottom: 24px;
  font-weight: 400; line-height: 1.5;
}
.tutorials-hero-stats {
  display: flex; align-items: stretch; justify-content: center; gap: 0;
  background: var(--bg-card); border: 1px solid rgba(148,163,184,.1);
  border-radius: 12px; padding: 0; overflow: hidden;
  max-width: 460px; margin: 0 auto;
}
.hero-stat {
  flex: 1; padding: 16px 12px; text-align: center;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.hero-stat-num {
  display: block; font-size: 26px; font-weight: 800; color: var(--accent-light);
  line-height: 1.2;
}
.hero-stat-label {
  font-size: 12px; color: var(--text-muted); font-weight: 500; margin-top: 4px;
}
.hero-stat-divider {
  width: 1px; background: rgba(148,163,184,.12); align-self: stretch;
}

/* ===== Main Area ===== */
.tutorials-main {
  max-width: 1200px; margin: 0 auto; padding: 0 24px 60px;
}

/* ===== Search Bar ===== */
.tutorials-search-bar {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 24px;
}
.search-bar-inner {
  flex: 1; position: relative;
}
.search-icon {
  position: absolute; left: 16px; top: 50%; transform: translateY(-50%);
  width: 20px; height: 20px; color: var(--text-muted); pointer-events: none;
}
.search-input-v2 {
  width: 100%; padding: 14px 44px 14px 48px; border: 1px solid rgba(148,163,184,.15);
  border-radius: 14px; background: var(--bg-card); color: var(--text-primary);
  font-size: 15px; outline: none; transition: all .25s;
}
.search-input-v2:focus {
  border-color: var(--accent); box-shadow: 0 0 0 3px rgba(245,158,11,.1);
}
.search-input-v2::placeholder { color: var(--text-muted); }
.search-clear {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  background: rgba(255,255,255,.08); border: none; color: var(--text-muted);
  width: 26px; height: 26px; border-radius: 50%; font-size: 16px;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all .2s; line-height: 1;
}
.search-clear:hover { background: rgba(239,68,68,.2); color: #ef4444; }
.sort-select {
  padding: 14px 36px 14px 16px; border: 1px solid rgba(148,163,184,.15);
  border-radius: 14px; background: var(--bg-card); color: var(--text-primary);
  font-size: 14px; font-weight: 500; outline: none; cursor: pointer;
  appearance: none; background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%2394a3b8' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-repeat: no-repeat; background-position: right 10px center; background-size: 18px;
  transition: all .25s;
}
.sort-select:focus { border-color: var(--accent); outline: none; }

/* ===== Layout: Sidebar + Content ===== */
.tutorials-layout {
  display: flex; gap: 28px; align-items: flex-start;
}

/* ===== Sidebar ===== */
.tutorials-sidebar {
  width: 260px; flex-shrink: 0;
}
.sidebar-sticky {
  position: sticky; top: 88px;
  display: flex; flex-direction: column; gap: 16px;
}
.sidebar-title {
  font-size: 13px; font-weight: 700; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 1px; margin: 0 0 2px;
}
.sidebar-cats, .sidebar-authors {
  display: flex; flex-direction: column; gap: 2px;
}
.sidebar-cat, .sidebar-author {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: 10px; font-size: 14px; font-weight: 500;
  color: var(--text-secondary); text-decoration: none; cursor: pointer;
  transition: all .2s; position: relative;
}
.sidebar-cat:hover, .sidebar-author:hover {
  background: rgba(255,255,255,.04); color: var(--text-primary);
}
.sidebar-cat.active, .sidebar-author.active {
  background: rgba(245,158,11,.1); color: var(--accent-light); font-weight: 600;
}
.sidebar-cat.active::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 3px; height: 20px; background: var(--accent); border-radius: 0 2px 2px 0;
}
.sidebar-cat-icon { font-size: 16px; width: 24px; text-align: center; }
.sidebar-cat-name { flex: 1; }
.sidebar-cat-count {
  font-size: 12px; color: var(--text-muted); font-weight: 600;
  background: rgba(255,255,255,.05); padding: 2px 8px; border-radius: 8px;
  min-width: 28px; text-align: center;
}
.sidebar-author-avatar { font-size: 18px; width: 24px; text-align: center; }
.sidebar-quick-links {
  display: flex; flex-direction: column; gap: 8px; margin-top: 8px;
  padding-top: 16px; border-top: 1px solid rgba(148,163,184,.08);
}
.sidebar-quick-link {
  display: flex; align-items: center; gap: 8px; padding: 10px 14px;
  border-radius: 10px; font-size: 13px; font-weight: 600; color: var(--text-secondary);
  text-decoration: none; transition: all .2s;
  background: rgba(255,255,255,.02); border: 1px solid rgba(148,163,184,.08);
}
.sidebar-quick-link:hover {
  background: rgba(245,158,11,.08); border-color: rgba(245,158,11,.2); color: var(--accent-light);
}

/* ===== Content Area ===== */
.tutorials-content { flex: 1; min-width: 0; }

/* Result Bar */
.tutorials-result-bar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px; padding: 0 4px;
}
.result-count { font-size: 14px; color: var(--text-muted); }
.result-count strong { color: var(--text-primary); font-size: 16px; }
.result-active-filters { display: flex; gap: 6px; flex-wrap: wrap; }

/* ===== Tutorial Cards Grid ===== */
.tutorials-grid-v2 {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px;
}

/* New card design */
.tutorial-card-v2 {
  background: var(--bg-card); border: 1px solid rgba(148,163,184,.1);
  border-radius: 16px; padding: 24px; cursor: pointer;
  transition: all .3s cubic-bezier(.4,0,.2,1);
  display: flex; flex-direction: column; gap: 12px;
  position: relative; overflow: hidden;
}
.tutorial-card-v2::after {
  content: ''; position: absolute; inset: 0; border-radius: 16px;
  background: radial-gradient(600px circle at var(--mouse-x,50%) var(--mouse-y,50%), rgba(245,158,11,.06), transparent 40%);
  opacity: 0; transition: opacity .3s; pointer-events: none;
}
.tutorial-card-v2:hover {
  transform: translateY(-4px);
  border-color: rgba(245,158,11,.25);
  box-shadow: 0 8px 30px rgba(0,0,0,.15), 0 2px 8px rgba(245,158,11,.06);
}
.tutorial-card-v2:hover::after { opacity: 1; }

.card-v2-header {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 10px;
}
.card-v2-category {
  padding: 4px 12px; border-radius: 20px; font-size: 11px; font-weight: 600;
  background: rgba(245,158,11,.1); color: var(--accent-light); white-space: nowrap;
}
.card-v2-category.online { background: rgba(59,130,246,.12); color: #60a5fa; }
.card-v2-category.display { background: rgba(245,158,11,.12); color: var(--accent-light); }
.card-v2-category.offline { background: rgba(16,185,129,.12); color: #34d399; }

.card-v2-author {
  display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-muted);
}
.card-v2-author-avatar { font-size: 16px; }

.card-v2-title {
  font-size: 17px; font-weight: 700; color: var(--text-primary);
  line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}

.card-v2-summary {
  font-size: 13px; color: var(--text-muted); line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  flex: 1;
}

.card-v2-tags {
  display: flex; gap: 6px; flex-wrap: wrap;
}
.card-v2-tag {
  padding: 3px 10px; border-radius: 6px; font-size: 11px; font-weight: 500;
  background: rgba(255,255,255,.04); color: var(--text-muted);
  border: 1px solid rgba(148,163,184,.08);
}

.card-v2-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 12px; border-top: 1px solid rgba(148,163,184,.06);
}
.card-v2-stats {
  display: flex; gap: 14px; font-size: 12px; color: var(--text-muted);
}
.card-v2-stat { display: flex; align-items: center; gap: 4px; }
.card-v2-read-more {
  font-size: 12px; font-weight: 600; color: var(--accent-light);
  display: flex; align-items: center; gap: 4px;
}
.card-v2-read-more::after {
  content: '→'; transition: transform .2s;
}
.tutorial-card-v2:hover .card-v2-read-more::after {
  transform: translateX(3px);
}

/* ===== Pagination v2 ===== */
.tutorials-pagination-v2 {
  display: flex; align-items: center; justify-content: center; gap: 6px;
  margin-top: 36px;
}
.page-btn-v2 {
  padding: 10px 16px; border: 1px solid rgba(148,163,184,.1); border-radius: 10px;
  background: var(--bg-card); color: var(--text-secondary); font-size: 14px;
  font-weight: 600; cursor: pointer; transition: all .2s; min-width: 42px;
  text-align: center; line-height: 1;
}
.page-btn-v2:hover:not(.disabled) {
  border-color: var(--accent); color: var(--accent-light); background: rgba(245,158,11,.05);
}
.page-btn-v2.active {
  background: var(--accent); border-color: var(--accent); color: #0f172a;
}
.page-btn-v2.disabled {
  opacity: .3; cursor: not-allowed; pointer-events: none;
}
.page-ellipsis-v2 {
  padding: 10px 4px; color: var(--text-muted); font-size: 14px;
}

/* ===== Loading Skeleton ===== */
.loading-skeleton {
  grid-column: 1 / -1; display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px;
}
.skeleton-card {
  height: 220px; border-radius: 16px; background: var(--bg-card);
  border: 1px solid rgba(148,163,184,.06);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}
@keyframes skeleton-pulse {
  0%, 100% { opacity: .4; }
  50% { opacity: .7; }
}

/* No Results */
.no-results-v2 {
  grid-column: 1 / -1; text-align: center; padding: 80px 20px;
}
.no-results-v2 .no-results-icon { font-size: 48px; margin-bottom: 16px; }
.no-results-v2 .no-results-text { font-size: 16px; color: var(--text-muted); }
.no-results-v2 .no-results-sub { font-size: 13px; color: var(--text-muted); margin-top: 6px; opacity: .7; }

/* ===== Content Detail Modal ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.7); z-index: 1000;
  display: none; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
}
.modal-overlay.show { display: flex; }
.modal-panel {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 16px; width: 90vw; max-width: 800px; max-height: 85vh;
  display: flex; flex-direction: column; overflow: hidden;
  box-shadow: 0 24px 64px rgba(0,0,0,.3);
}
.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 24px; border-bottom: 1px solid var(--border);
}
.modal-title { font-size: 18px; font-weight: 700; }
.modal-close {
  background: none; border: none; color: var(--text-muted);
  font-size: 24px; cursor: pointer; padding: 0 4px; line-height: 1;
}
.modal-close:hover { color: var(--text-primary); }
.modal-body { padding: 24px; overflow-y: auto; }

/* ===== Unlock Modal ===== */
.unlock-panel {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 16px; padding: 32px 28px 24px; max-width: 420px; width: 90vw;
  text-align: center; box-shadow: 0 24px 64px rgba(0,0,0,.3);
}
.unlock-icon { font-size: 40px; margin-bottom: 12px; }
.unlock-title { font-size: 18px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.unlock-desc { font-size: 14px; color: var(--text-muted); line-height: 1.6; margin-bottom: 20px; }
.unlock-desc strong { color: var(--accent-light); font-weight: 700; }
.unlock-preview { font-size: 13px; color: var(--text-muted); line-height: 1.5; margin-bottom: 16px;
  padding: 12px 16px; background: rgba(255,255,255,.03); border-radius: 8px; border: 1px solid rgba(148,163,184,.08); }
.unlock-actions { display: flex; gap: 12px; justify-content: center; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .tutorials-layout { flex-direction: column; }
  .tutorials-sidebar { width: 100%; }
  .sidebar-sticky { position: static; flex-direction: row; flex-wrap: wrap; gap: 12px; }
  .sidebar-cats, .sidebar-authors { flex-direction: row; flex-wrap: wrap; }
  .sidebar-cat, .sidebar-author { font-size: 13px; padding: 8px 12px; }
  .sidebar-cat.active::before { display: none; }
  .sidebar-cat-count { display: none; }
  .sidebar-quick-links { display: none; }
  .tutorials-grid-v2 { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
}
@media (max-width: 768px) {
  .tutorials-hero-title { font-size: 26px; }
  .tutorials-hero-v2 { padding: 32px 16px 28px; }
  .hero-stat { padding: 12px 8px; }
  .hero-stat-num { font-size: 22px; }
  .tutorials-hero-stats { max-width: 340px; border-radius: 10px; }
  .tutorials-search-bar { flex-direction: column; }
  .tutorials-grid-v2 { grid-template-columns: 1fr; }
  .tutorials-pagination-v2 { flex-wrap: wrap; }
  .page-btn-v2 { padding: 8px 12px; font-size: 13px; }
  .modal-panel { width: 95vw; max-width: 95vw; border-radius: 12px; }
}