/* ============================================================
   LAYOUT — App shell, sidebar, topbar, content, responsive
   ============================================================ */

/* ── App Shell ── */
html, body { height: 100%; overflow: hidden; }

#app {
  display: flex;
  width: 100%;
  height: 100%;
  background: var(--bg-app);
  overflow: hidden;
}

/* ── Sidebar ── */
#sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
}

#sidebar-logo {
  height: var(--topbar-h);
  padding: 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-logo-mark {
  width: 32px; height: 32px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.sidebar-logo-mark svg { width: 18px; height: 18px; color: #fff; }

.sidebar-logo-text {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sidebar-logo-text span { color: var(--color-primary); }

#sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 8px;
  scrollbar-width: none;
}
#sidebar-nav::-webkit-scrollbar { display: none; }

.nav-section-label {
  padding: 10px 8px 4px;
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-light);
  user-select: none;
}

.spaces-nav-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: none;
  border: none;
  font-family: inherit;
  cursor: pointer;
  transition: color 0.1s;
}
.spaces-nav-label:hover { color: var(--text-muted); }

.spaces-nav-chevron {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  opacity: 0.6;
  transition: transform 0.15s ease;
}
.spaces-nav-group.collapsed .spaces-nav-chevron { transform: rotate(-90deg); }

.spaces-nav-items {
  overflow: hidden;
  max-height: 600px;
  transition: max-height 0.2s ease, opacity 0.15s ease;
}
.spaces-nav-group.collapsed .spaces-nav-items {
  max-height: 0;
  opacity: 0;
}

.nav-section-label.nav-section-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}
.nav-section-label.nav-section-toggle:hover { color: var(--text-muted); }
.nav-section-label.nav-section-toggle.collapsed .spaces-nav-chevron { transform: rotate(-90deg); }
.nav-section-label.nav-section-toggle.collapsed ~ .nav-item.group-hoctap { display: none; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: var(--fs-sm);
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.1s, color 0.1s;
  margin-bottom: 1px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-item svg { width: 17px; height: 17px; flex-shrink: 0; opacity: 0.6; }
.nav-item:hover { background: var(--bg-hover); color: var(--text); text-decoration: none; }
.nav-item:hover svg { opacity: 0.9; }
.nav-item.active { background: var(--bg-active); color: var(--color-primary); font-weight: 600; }
.nav-item.active svg { opacity: 1; color: var(--color-primary); }

.nav-badge {
  margin-left: auto;
  background: var(--color-primary);
  color: #fff;
  font-size: var(--fs-xs);
  font-weight: 700;
  border-radius: 99px;
  padding: 1px 6px;
  min-width: 18px;
  text-align: center;
  flex-shrink: 0;
}

#sidebar-user {
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 9px;
  flex-shrink: 0;
  background: var(--bg-app);
}

.user-info { flex: 1; min-width: 0; }
.user-name  { font-size: var(--fs-sm); font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-level { font-size: var(--fs-xs); color: var(--color-primary); font-weight: 500; }

.user-avatar-wrap { position: relative; flex-shrink: 0; }
.user-status-dot {
  position: absolute;
  bottom: 0; right: 0;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent-green);
  border: 2px solid var(--bg-app);
}

/* ── Main Area ── */
#main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
  background: var(--bg-card);
}

/* ── Topbar ── */
/* Title + icon controls now live in #subnav-bar (.topbar-right is moved there in markup); this row is kept in the DOM (dynamic titles still target it via JS) but no longer rendered. */
#topbar {
  display: none;
}

.topbar-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--text);
}
.topbar-title svg { color: var(--text-light); width: 17px; height: 17px; }

.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 6px; }

.topbar-search {
  position: relative;
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-app);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 7px 12px;
  font-size: var(--fs-sm);
  color: var(--text-light);
  cursor: text;
  transition: border-color 0.15s;
  min-width: 160px;
}
.topbar-search:hover, .topbar-search:focus-within { border-color: #cbd5e1; }
.topbar-search svg { width: 13px; height: 13px; flex-shrink: 0; }
.topbar-search input {
  border: none;
  background: transparent;
  outline: none;
  font: inherit;
  color: var(--text);
  width: 100%;
  min-width: 100px;
}
.topbar-search input::placeholder { color: var(--text-light); }

.gsr-panel {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  width: 340px;
  max-width: min(340px, calc(100vw - 32px));
  max-height: 420px;
  overflow-y: auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.14);
  z-index: 200;
}
.gsr-panel.open { display: block; }
.gsr-group-title {
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 10px 14px 4px;
}
.gsr-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
}
.gsr-item:hover { background: var(--bg-hover); }
.gsr-item-icon {
  width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; color: #fff; background: var(--color-primary);
}
.gsr-item-text { flex: 1; min-width: 0; }
.gsr-item-title { font-size: var(--fs-sm); font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.gsr-item-sub { font-size: var(--fs-xs); color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.gsr-empty, .gsr-loading {
  padding: 20px 14px;
  text-align: center;
  color: var(--text-muted);
  font-size: var(--fs-sm);
}

.icon-btn {
  width: 34px; height: 34px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: background 0.1s, color 0.1s;
  position: relative;
  text-decoration: none;
}
.icon-btn:hover { background: var(--bg-hover); color: var(--text); text-decoration: none; }
.icon-btn svg { width: 18px; height: 18px; }

/* ── Subnav (quick nav tabs) ── */
.subnav-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  flex-shrink: 0;
  flex-wrap: wrap;
}
.subnav-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}
.subnav-item svg { width: 16px; height: 16px; flex-shrink: 0; }
.subnav-item:hover { background: var(--bg-hover); color: var(--text); text-decoration: none; }
.subnav-item.active { background: var(--bg-active); color: var(--color-primary); }
.subnav-item.disabled { opacity: 0.45; cursor: not-allowed; pointer-events: none; }

.notif-dot {
  position: absolute;
  top: 5px; right: 5px;
  width: 8px; height: 8px;
  background: var(--accent-red);
  border-radius: 50%;
  border: 2px solid var(--bg-card);
}

/* ── Content row ── */
#content-row {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* ── Feed ── */
#feed {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 20px 24px;
  scrollbar-width: thin;
  scrollbar-color: rgba(0,0,0,0.08) transparent;
  min-width: 0;
}
#feed::-webkit-scrollbar { width: 4px; }
#feed::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.08); border-radius: 2px; }

/* ── Right Panel ── */
#right-panel {
  width: var(--rp-w);
  min-width: var(--rp-w);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--bg-app);
  scrollbar-width: thin;
  scrollbar-color: rgba(0,0,0,0.06) transparent;
  flex-shrink: 0;
}
#right-panel::-webkit-scrollbar { width: 3px; }
#right-panel::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.07); border-radius: 2px; }

/* Right panel cards */
.rp-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px;
}

/* ── Leaderboard ── */
.lb-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 0;
  border-bottom: 1px solid var(--border);
}
.lb-item:last-child { border-bottom: none; }
.lb-rank { width: 20px; font-size: var(--fs-sm); font-weight: 700; text-align: center; flex-shrink: 0; color: var(--text-muted); }
.lb-rank.gold   { color: #d97706; }
.lb-rank.silver { color: #94a3b8; }
.lb-rank.bronze { color: #b45309; }
.lb-name { font-size: var(--fs-sm); font-weight: 500; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lb-exp  { font-size: var(--fs-xs); color: var(--text-light); }

/* ── Mobile topbar ── */
#mobile-topbar {
  display: none;
  height: var(--topbar-h);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  align-items: center;
  padding: 0 14px;
  gap: 10px;
  flex-shrink: 0;
}

.mob-menu-btn {
  width: 34px; height: 34px;
  border-radius: var(--radius-sm);
  background: var(--bg-hover);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  flex-shrink: 0;
}
.mob-menu-btn svg { width: 17px; height: 17px; }

/* ── Mobile Nav ── */
#mobile-nav {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: var(--mob-nav-h);
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  align-items: center;
  justify-content: space-around;
  z-index: 500;
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.mob-nav-btn,
.mob-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: color 0.1s;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  min-width: 52px;
}
.mob-nav-btn svg,
.mob-nav-item svg { width: 22px; height: 22px; }
.mob-nav-btn.active,
.mob-nav-item.active { color: var(--color-primary); }

/* ── Mobile Sidebar ── */
#mob-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 400;
  backdrop-filter: blur(2px);
}
#mob-overlay.open { display: block; }

#mob-sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: 280px;
  background: var(--bg-card);
  z-index: 450;
  transform: translateX(-100%);
  transition: transform 0.25s ease;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  padding-top: env(safe-area-inset-top, 0);
}
#mob-sidebar.open { transform: translateX(0); }

/* ── Mobile Main Menu (full site navigation) ── */
#mob-mainmenu-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 400;
  backdrop-filter: blur(2px);
}
#mob-mainmenu-overlay.open { display: block; }

#mob-mainmenu {
  position: fixed;
  top: 0; right: 0; bottom: 0;
  width: 280px;
  background: var(--bg-card);
  z-index: 450;
  transform: translateX(100%);
  transition: transform 0.25s ease;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  padding-top: env(safe-area-inset-top, 0);
}
#mob-mainmenu.open { transform: translateX(0); }

/* ── Responsive ── */
@media (max-width: 1200px) {
  #right-panel { display: none; }
}

@media (max-width: 768px) {
  html, body { overflow: hidden; }
  #app { height: 100dvh; }

  #sidebar         { display: none; }
  #right-panel     { display: none; }
  #subnav-bar      { display: none; }
  #mobile-topbar   { display: flex; }
  #mobile-nav      { display: flex; }

  #main { padding-bottom: var(--mob-nav-h); }
  #feed { padding: 10px 12px; }

  .post-thumbnail { width: 88px; height: 56px; }
}

/* ── Auth pages (login / register) ── */
.auth-page {
  min-height: 100vh;
  display: flex;
  background: var(--bg-app);
  overflow: auto;
}

.auth-left {
  flex: 1;
  display: none;
  flex-direction: column;
  justify-content: center;
  padding: 60px 64px;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  position: relative;
  overflow: hidden;
}

.auth-left::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(14,165,233,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,165,233,0.04) 1px, transparent 1px);
  background-size: 36px 36px;
}

.auth-left-content { position: relative; z-index: 1; }

.auth-right {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px 32px;
  min-height: 100vh;
}

@media (min-width: 900px) {
  .auth-left { display: flex; }
  .auth-right { max-width: 460px; padding: 56px 52px; min-height: auto; margin: 0; }
  .auth-page { min-height: 100vh; }
  body.auth-body { overflow: hidden; }
  .auth-page { height: 100vh; }
}