/* ────────────────────────────────────────────────────────────
   链研社课程壳 · 与「加密期权 · 从零到精通」同构
   依赖：lianyanshe.css（token）+ 可选 _portal.css（顶栏 56px）
   结构：.app > .sidebar + .main > .top-header + 正文
   ──────────────────────────────────────────────────────────── */

:root {
  --portal-h: 0px;
  --sidebar-w: 280px;
  --top-h: 64px;
  /* 与加密期权内联 token 名兼容 */
  --accent-primary: var(--accent);
  --accent-secondary: var(--accent-2);
  --accent-highlight: var(--accent-hi);
  --gradient-warm: var(--grad-warm);
  --grid-color: var(--grid);
  --shadow: var(--shadow-md);
}

body:has([data-portal-host]) {
  --portal-h: 56px;
}

/* 旧壳类名 → 新壳（迁移期双写） */
.ls-course-shell { display: contents; }
body.ls-course .ls-course-topbar { display: none !important; }

/* ── App grid ── */
.app,
.course-app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
  position: relative;
  z-index: 1;
  padding-top: var(--portal-h);
  box-sizing: border-box;
}

/* ── Sidebar（课程概览） ── */
.sidebar,
aside.sidebar,
#sidebar.sidebar,
.ls-course-sidebar {
  background: var(--bg-secondary) !important;
  border-right: 1px solid var(--border) !important;
  overflow-y: auto;
  height: calc(100vh - var(--portal-h));
  position: fixed !important;
  top: var(--portal-h) !important;
  left: 0 !important;
  width: var(--sidebar-w) !important;
  max-width: var(--sidebar-w);
  padding: 20px 0 28px !important;
  z-index: 51;
  transition: left 0.3s ease;
  box-sizing: border-box;
  transform: none !important; /* 覆盖 tailwind -translate-x */
}

.sidebar::-webkit-scrollbar,
.ls-course-sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-track,
.ls-course-sidebar::-webkit-scrollbar-track { background: var(--bg-secondary); }
.sidebar::-webkit-scrollbar-thumb,
.ls-course-sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

/* Brand */
.sidebar .brand,
.ls-course-sidebar .brand {
  padding: 4px 24px 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  background: var(--gradient-warm);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1;
}

.brand-text h1,
.brand-text .brand-title {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  margin: 0;
}

.brand-text p,
.brand-text .brand-sub {
  font-size: 11px;
  color: var(--text-muted);
  margin: 2px 0 0;
  line-height: 1.35;
}

.brand-producer {
  margin: 0 24px 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  color: inherit;
  text-decoration: none;
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.3;
}
.brand-producer strong {
  color: var(--accent-primary);
  font-weight: 700;
}
.brand-producer:hover { opacity: 0.85; }

/* Search */
.search-box {
  margin: 0 16px 14px;
  position: relative;
}
.search-box input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 12px 9px 32px;
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  font-family: var(--sans);
  box-sizing: border-box;
}
.search-box input::placeholder { color: var(--text-muted); }
.search-box input:focus { border-color: var(--accent-primary); }
.search-box::before {
  content: "⌕";
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  color: var(--text-muted);
  pointer-events: none;
}

/* Nav groups */
.nav-group { margin-bottom: 6px; }

.nav-group-title,
.sidebar .nav-group-title,
.ls-course-sidebar .nav-group-title {
  padding: 12px 24px 6px !important;
  font-family: var(--serif) !important;
  font-size: 11px !important;
  font-weight: 600 !important;
  color: var(--text-muted) !important;
  letter-spacing: 1.5px !important;
  text-transform: uppercase !important;
  margin: 0 !important;
  background: transparent !important;
  border: none !important;
}

/* Nav items — 加密期权同款 */
.nav-item,
.sidebar .nav-item,
.ls-course-sidebar .nav-item,
.ls-course-sidebar a,
.sidebar a.nav-item,
#sidebar button.nav-item,
#sidebar .nav-item {
  display: flex !important;
  align-items: center !important;
  gap: 0 !important;
  width: 100%;
  padding: 9px 24px !important;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  border: none !important;
  border-left: 2px solid transparent !important;
  border-radius: 0 !important;
  font-size: 13px !important;
  font-family: var(--sans) !important;
  font-weight: 400 !important;
  color: var(--text-secondary) !important;
  background: transparent !important;
  box-shadow: none !important;
  text-decoration: none !important;
  text-align: left;
  user-select: none;
  appearance: none;
  -webkit-appearance: none;
  line-height: 1.4 !important;
  box-sizing: border-box;
}

.nav-item:hover,
.ls-course-sidebar a:hover,
#sidebar button.nav-item:hover {
  background: var(--bg-hover) !important;
  color: var(--text-primary) !important;
  box-shadow: none !important;
}

.nav-item.active,
.nav-item.is-active,
.ls-course-sidebar a.active,
#sidebar button.nav-item.active,
#sidebar button.is-active,
#sidebar button[aria-current="page"] {
  background: var(--bg-card) !important;
  color: var(--accent-primary) !important;
  border-left-color: var(--accent-primary) !important;
  font-weight: 500 !important;
  box-shadow: none !important;
}

.nav-icon,
.nav-item .nav-icon,
.nav-item .num,
.ls-course-sidebar .num,
.nav-item .nav-num,
.nav-item .nav-dot {
  margin-right: 10px !important;
  font-size: 11px !important;
  color: var(--text-muted) !important;
  font-family: var(--serif) !important;
  min-width: 24px !important;
  width: auto !important;
  height: auto !important;
  flex: 0 0 auto !important;
  display: inline-flex !important;
  align-items: center;
  justify-content: flex-start;
  border: none !important;
  border-radius: 0 !important;
  background: transparent !important;
  padding: 0 !important;
  letter-spacing: 0;
  font-weight: 600;
}

.nav-item.active .nav-icon,
.nav-item.active .num,
.nav-item.active .nav-num,
.nav-item.active .nav-dot,
.nav-item.is-active .nav-icon {
  color: var(--accent-primary) !important;
}

.nav-item .nav-label,
.nav-item .nav-text,
.ls-course-sidebar a > span:last-child {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-item .nav-tag {
  margin-left: auto;
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 3px;
  background: var(--bg-primary);
  color: var(--text-muted);
  flex-shrink: 0;
}
.nav-item .nav-tag.essential {
  background: var(--accent-soft);
  color: var(--accent-secondary);
}

/* 模块分组（海龟 / 威科夫） */
.sidebar-module,
#sidebar .sidebar-module {
  margin-bottom: 4px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}
.sidebar-module:last-child { border-bottom: none; }
.sidebar-module-head {
  padding: 10px 24px 4px !important;
}
.sidebar-module-id {
  font-family: var(--mono, var(--serif));
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.sidebar-module-title {
  font-family: var(--serif);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
  margin-top: 2px;
}

/* 侧栏进度条（海龟） */
.sidebar-progress {
  margin: 0 16px 14px;
  padding: 12px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.sidebar-progress .sp-label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 8px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
}
.sidebar-progress .sp-bar {
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 999px;
  overflow: hidden;
}
.sidebar-progress .sp-fill {
  height: 100%;
  background: var(--grad-line, var(--gradient-warm));
  border-radius: 999px;
  transition: width 0.35s ease;
}
.sidebar-progress .sp-meta {
  margin-top: 6px;
  font-size: 11px;
  color: var(--text-muted);
}

/* ── Main + Top header ── */
.main,
.ls-course-main,
#content.main,
main.ls-course-main {
  grid-column: 2;
  margin-left: 0 !important;
  width: auto !important;
  max-width: none;
  min-height: calc(100vh - var(--portal-h));
  padding: calc(var(--top-h) + 8px) clamp(20px, 4vw, 48px) 64px !important;
  box-sizing: border-box;
  overflow-x: hidden;
  background: transparent !important;
  color: var(--text-primary);
}

/* 当 main 不在 grid 内、仅用 margin 布局时（兜底） */
body:not(:has(.app)) .ls-course-main,
body:not(:has(.course-app)) .ls-course-main {
  margin-left: var(--sidebar-w) !important;
}

.top-header {
  position: fixed;
  top: var(--portal-h);
  left: var(--sidebar-w);
  right: 0;
  height: var(--top-h);
  background: color-mix(in srgb, var(--bg-primary) 92%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(16px, 3vw, 40px);
  z-index: 50;
  box-sizing: border-box;
  gap: 12px;
}

.top-header-left {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}
.top-header-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.breadcrumb-mini {
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.breadcrumb-mini a {
  color: var(--text-secondary);
  text-decoration: none;
}
.breadcrumb-mini a:hover { color: var(--accent-primary); }
.breadcrumb-sep { margin: 0 6px; opacity: 0.5; }
.breadcrumb-mini .current {
  color: var(--text-primary);
  font-weight: 500;
}

/* 移动端菜单按钮 */
.menu-toggle,
#mobile-menu-toggle,
#menuToggle.course-menu-btn {
  display: none;
  position: fixed;
  top: calc(var(--portal-h) + 12px);
  left: 14px;
  z-index: 60;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-family: var(--sans);
  box-shadow: var(--shadow-sm);
}

.sidebar-mask {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(42, 36, 25, 0.35);
  z-index: 50;
  top: var(--portal-h);
}
.sidebar-mask.show { display: block; }

/* 阅读进度 */
.read-progress {
  position: fixed;
  top: var(--portal-h);
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-highlight));
  z-index: 10002;
  pointer-events: none;
  transition: width 0.1s linear;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .app,
  .course-app {
    grid-template-columns: 1fr;
  }

  .sidebar,
  aside.sidebar,
  #sidebar.sidebar,
  .ls-course-sidebar {
    left: calc(-1 * var(--sidebar-w) - 20px) !important;
    box-shadow: var(--shadow-lg);
    z-index: 55;
  }
  .sidebar.open,
  #sidebar.sidebar.open,
  .ls-course-sidebar.open {
    left: 0 !important;
  }

  .top-header {
    left: 0;
    padding-left: 56px;
  }

  .main,
  .ls-course-main,
  #content.main {
    margin-left: 0 !important;
    padding-left: 16px !important;
    padding-right: 16px !important;
  }

  .menu-toggle,
  #mobile-menu-toggle,
  #menuToggle.course-menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  body:not(:has(.app)) .ls-course-main {
    margin-left: 0 !important;
  }
}

@media (max-width: 640px) {
  .top-header { height: 56px; }
  :root { --top-h: 56px; }
  .brand-text h1 { font-size: 15px; }
}