@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap");

* { margin:0; padding:0; box-sizing:border-box; }

/* ============================================================
   THEME: DELHIVERY BRAND (Default)
   Red #E42529, Black #1A1A1A, White #FFF, Grey #F5F5F5
   ============================================================ */
:root, [data-theme="delhivery"] {
  --bg-primary: #F7F7F8;
  --bg-secondary: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-sidebar: #1A1A1A;
  --bg-sidebar-hover: #2A2A2A;
  --bg-sidebar-active: rgba(228,37,41,0.12);
  --bg-chat: #FFFFFF;
  --border: #E8E8EB;
  --border-strong: #D5D5DA;
  --text-primary: #1A1A1A;
  --text-secondary: #555;
  --text-muted: #999;
  --text-sidebar: #CCCCCC;
  --text-sidebar-active: #FFFFFF;
  --accent: #E42529;
  --accent-light: rgba(228,37,41,0.08);
  --accent-glow: rgba(228,37,41,0.12);
  --accent-shadow: rgba(228,37,41,0.25);
  --danger: #E42529;
  --warning: #F59E0B;
  --success: #16A34A;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.04);
  --card-hover-shadow: 0 4px 24px rgba(0,0,0,0.08);
  --glass-blur: none;
  --glass-border: 1px solid #E8E8EB;
  --gradient-bg: #F7F7F8;
  --sc-gradient-1: linear-gradient(135deg, #FEF2F2, #FFF);
  --sc-gradient-2: linear-gradient(135deg, #FEF2F2, #FFF);
  --sc-gradient-3: linear-gradient(135deg, #FFFBEB, #FFF);
  --sc-gradient-4: linear-gradient(135deg, #FFF7ED, #FFF);
  --sc-gradient-5: linear-gradient(135deg, #F0FDF4, #FFF);
  --insight-bg: #FEF2F2;
  --insight-border: rgba(228,37,41,0.2);
  --table-header: #F9FAFB;
  --table-hover: #FEF2F2;
  --chart-bar: linear-gradient(to top, #E42529, #F87171);
  --chat-user-bg: #E42529;
  --toggle-bg: #E8E8EB;
  --sidebar-border: none;
  --brand-icon: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' fill='%23E42529' xmlns='http://www.w3.org/2000/svg'%3E%3Crect x='2' y='4' width='8' height='16' rx='1'/%3E%3C/svg%3E");
}

/* ============================================================
   THEME: LIGHT GLASS
   ============================================================ */
[data-theme="light"] {
  --bg-primary: #F0F2F5;
  --bg-secondary: rgba(255,255,255,0.65);
  --bg-card: rgba(255,255,255,0.55);
  --bg-sidebar: rgba(255,255,255,0.45);
  --bg-sidebar-hover: rgba(99,102,241,0.06);
  --bg-sidebar-active: rgba(99,102,241,0.1);
  --bg-chat: rgba(255,255,255,0.7);
  --border: rgba(255,255,255,0.3);
  --border-strong: rgba(200,200,220,0.4);
  --text-primary: #1A1A2E;
  --text-secondary: #555;
  --text-muted: #888;
  --text-sidebar: #666;
  --text-sidebar-active: #6366F1;
  --accent: #6366F1;
  --accent-light: rgba(99,102,241,0.06);
  --accent-glow: rgba(99,102,241,0.1);
  --accent-shadow: rgba(99,102,241,0.25);
  --danger: #EF4444;
  --warning: #F59E0B;
  --success: #22C55E;
  --card-shadow: 0 8px 32px rgba(0,0,0,0.08);
  --card-hover-shadow: 0 12px 40px rgba(0,0,0,0.12);
  --glass-blur: blur(20px);
  --glass-border: 1px solid rgba(255,255,255,0.4);
  --gradient-bg: linear-gradient(135deg, #E8EAF6 0%, #F5F5FF 30%, #FCE4EC 60%, #E8F5E9 100%);
  --sc-gradient-1: linear-gradient(135deg, rgba(99,102,241,0.08), rgba(99,102,241,0.02));
  --sc-gradient-2: linear-gradient(135deg, rgba(239,68,68,0.08), rgba(239,68,68,0.02));
  --sc-gradient-3: linear-gradient(135deg, rgba(245,158,11,0.08), rgba(245,158,11,0.02));
  --sc-gradient-4: linear-gradient(135deg, rgba(249,115,22,0.08), rgba(249,115,22,0.02));
  --sc-gradient-5: linear-gradient(135deg, rgba(34,197,94,0.08), rgba(34,197,94,0.02));
  --insight-bg: rgba(99,102,241,0.06);
  --insight-border: rgba(99,102,241,0.2);
  --table-header: rgba(0,0,0,0.03);
  --table-hover: rgba(99,102,241,0.04);
  --chart-bar: linear-gradient(to top, #6366F1, #A5B4FC);
  --chat-user-bg: #6366F1;
  --toggle-bg: #DDD;
  --sidebar-border: 1px solid rgba(255,255,255,0.4);
}

/* ============================================================
   THEME: DARK (NERVE)
   ============================================================ */
[data-theme="dark"] {
  --bg-primary: #0A0A1A;
  --bg-secondary: rgba(17,17,39,0.75);
  --bg-card: rgba(20,20,50,0.6);
  --bg-sidebar: rgba(12,12,30,0.9);
  --bg-sidebar-hover: rgba(99,102,241,0.08);
  --bg-sidebar-active: rgba(99,102,241,0.15);
  --bg-chat: rgba(15,15,35,0.92);
  --border: rgba(255,255,255,0.06);
  --border-strong: rgba(255,255,255,0.1);
  --text-primary: #F0F0F5;
  --text-secondary: #AAA;
  --text-muted: #666;
  --text-sidebar: #888;
  --text-sidebar-active: #818CF8;
  --accent: #818CF8;
  --accent-light: rgba(129,140,248,0.08);
  --accent-glow: rgba(129,140,248,0.12);
  --accent-shadow: rgba(129,140,248,0.3);
  --danger: #F87171;
  --warning: #FBBF24;
  --success: #4ADE80;
  --card-shadow: 0 8px 32px rgba(0,0,0,0.4);
  --card-hover-shadow: 0 12px 40px rgba(0,0,0,0.5);
  --glass-blur: blur(20px);
  --glass-border: 1px solid rgba(255,255,255,0.06);
  --gradient-bg: linear-gradient(135deg, #0A0A1A 0%, #111133 50%, #0A0A1A 100%);
  --sc-gradient-1: linear-gradient(135deg, rgba(129,140,248,0.12), rgba(129,140,248,0.03));
  --sc-gradient-2: linear-gradient(135deg, rgba(248,113,113,0.12), rgba(248,113,113,0.03));
  --sc-gradient-3: linear-gradient(135deg, rgba(251,191,36,0.12), rgba(251,191,36,0.03));
  --sc-gradient-4: linear-gradient(135deg, rgba(251,146,60,0.12), rgba(251,146,60,0.03));
  --sc-gradient-5: linear-gradient(135deg, rgba(74,222,128,0.12), rgba(74,222,128,0.03));
  --insight-bg: rgba(129,140,248,0.1);
  --insight-border: rgba(129,140,248,0.25);
  --table-header: rgba(255,255,255,0.03);
  --table-hover: rgba(129,140,248,0.06);
  --chart-bar: linear-gradient(to top, #818CF8, rgba(129,140,248,0.4));
  --chat-user-bg: #6366F1;
  --toggle-bg: #333;
  --sidebar-border: 1px solid rgba(255,255,255,0.06);
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--gradient-bg);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background 0.5s ease, color 0.3s ease;
  overflow-x: hidden;
}

.app { display: flex; min-height: 100vh; }

/* ---- SIDEBAR ---- */
.sidebar {
  width: 240px;
  background: var(--bg-sidebar);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-right: var(--sidebar-border);
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  transition: width 0.35s cubic-bezier(0.4,0,0.2,1), background 0.5s ease;
  z-index: 10;
  flex-shrink: 0;
  position: relative;
}

.brand { padding: 0 20px 18px; border-bottom: 1px solid var(--border); margin-bottom: 8px; display:flex; align-items:center; gap:10px; }
.brand-logo {
  width: 28px; height: 28px;
  background: var(--accent);
  border-radius: 6px;
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; color: #fff; font-size: 14px;
}
.brand-text-wrap { overflow: hidden; white-space: nowrap; }
.brand-text { font-size: 16px; font-weight: 700; color: var(--text-sidebar-active); letter-spacing: -0.3px; }
.brand-sub { font-size: 9px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1.5px; margin-top: 1px; }

.nav-item {
  display: flex; align-items: center; gap: 12px;
  padding: 9px 20px; cursor: pointer;
  color: var(--text-sidebar); font-size: 13px; font-weight: 500;
  transition: all 0.2s ease;
  border-left: 3px solid transparent;
  white-space: nowrap;
}
.nav-item:hover { background: var(--bg-sidebar-hover); color: var(--text-sidebar-active); }
.nav-item.active {
  background: var(--bg-sidebar-active);
  border-left-color: var(--accent);
  color: var(--text-sidebar-active);
  font-weight: 600;
}
.nav-icon { font-size: 15px; width: 20px; text-align: center; flex-shrink: 0; }

.sidebar-divider { border-top: 1px solid var(--border); margin: 6px 16px; }

.sidebar-bottom {
  margin-top: auto; padding: 14px 20px;
  border-top: 1px solid var(--border);
}

/* Theme switcher */
.theme-switcher { display: flex; gap: 4px; }
.theme-btn {
  flex: 1; padding: 6px 0; border: none;
  border-radius: 6px; font-size: 11px;
  cursor: pointer; transition: all 0.25s;
  background: transparent; color: var(--text-sidebar);
  font-weight: 500; font-family: inherit;
}
.theme-btn.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px var(--accent-shadow);
}
.theme-btn:hover:not(.active) { background: var(--bg-sidebar-hover); }

/* ---- MAIN ---- */
.main {
  flex: 1; padding: 24px 28px;
  transition: margin 0.4s cubic-bezier(0.4,0,0.2,1);
  overflow-y: auto; max-height: 100vh;
}
.main.chat-open { margin-right: 380px; }

.topbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 24px;
}
.page-title { font-size: 22px; font-weight: 700; }
.page-meta { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.filters { display: flex; gap: 8px; align-items: center; }
.filter-chip {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: 8px;
  padding: 7px 14px;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--card-shadow);
  font-family: inherit;
}
.filter-chip:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none; border-radius: 8px;
  padding: 7px 16px;
  font-size: 12px; font-weight: 600;
  cursor: pointer; transition: all 0.2s;
  box-shadow: 0 4px 14px var(--accent-shadow);
  font-family: inherit;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px var(--accent-shadow); }

/* ---- SCORECARDS ---- */
.scorecards { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin-bottom: 24px; }
.scorecard {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: 14px;
  padding: 18px;
  box-shadow: var(--card-shadow);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  position: relative; overflow: hidden;
}
.scorecard::before {
  content: "";
  position: absolute; top:0; left:0; right:0; bottom:0;
  border-radius: 14px; z-index: 0;
}
.scorecard:nth-child(1)::before { background: var(--sc-gradient-1); }
.scorecard:nth-child(2)::before { background: var(--sc-gradient-2); }
.scorecard:nth-child(3)::before { background: var(--sc-gradient-3); }
.scorecard:nth-child(4)::before { background: var(--sc-gradient-4); }
.scorecard:nth-child(5)::before { background: var(--sc-gradient-5); }
.scorecard:hover { transform: translateY(-3px); box-shadow: var(--card-hover-shadow); }
.scorecard > * { position: relative; z-index: 1; }
.sc-label { font-size: 10px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1.2px; font-weight: 600; }
.sc-value { font-size: 28px; font-weight: 800; margin: 6px 0 4px; letter-spacing: -1px; }
.sc-sub { font-size: 11px; color: var(--text-secondary); }
.sc-trend { font-size: 11px; margin-top: 6px; display: flex; align-items: center; gap: 4px; }
.sc-trend.up { color: var(--success); }
.sc-trend.down { color: var(--danger); }

/* ---- GLASS CARDS ---- */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--card-shadow);
  transition: all 0.3s;
}
.glass-card:hover { box-shadow: var(--card-hover-shadow); }
.card-title { font-size: 14px; font-weight: 600; margin-bottom: 14px; }

.chart-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 20px; }

.bars { display: flex; align-items: flex-end; gap: 3px; height: 120px; padding: 0 4px; }
.bar {
  flex: 1; background: var(--chart-bar);
  border-radius: 3px 3px 0 0;
  transition: all 0.3s; min-width: 6px;
}
.bar:hover { opacity: 0.8; transform: scaleY(1.04); transform-origin: bottom; }

.progress-row { margin-bottom: 10px; }
.progress-label { display: flex; justify-content: space-between; font-size: 12px; color: var(--text-secondary); margin-bottom: 4px; }
.progress-track { background: var(--border-strong); border-radius: 6px; height: 8px; overflow: hidden; }
.progress-fill { height: 100%; border-radius: 6px; transition: width 1s cubic-bezier(0.4,0,0.2,1); }

/* ---- TABLE ---- */
.data-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.data-table thead th {
  text-align: left; padding: 10px 12px;
  color: var(--text-muted); font-weight: 600;
  background: var(--table-header);
  font-size: 10px; text-transform: uppercase; letter-spacing: 0.5px;
}
.data-table thead th:not(:first-child) { text-align: right; }
.data-table tbody td {
  padding: 10px 12px; border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}
.data-table tbody td:not(:first-child) { text-align: right; }
.data-table tbody tr { cursor: pointer; }
.data-table tbody tr:hover td { background: var(--table-hover); }
.facility-name { font-weight: 600; color: var(--text-primary); }
.metric-good { color: var(--success); font-weight: 600; }
.metric-warn { color: var(--warning); font-weight: 600; }
.metric-bad { color: var(--danger); font-weight: 600; }

/* ---- INSIGHT ---- */
.insight-card {
  background: var(--insight-bg);
  border: 1px solid var(--insight-border);
  border-radius: 14px;
  padding: 18px; margin-top: 20px;
  transition: all 0.3s;
}
.insight-header { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.insight-badge { font-size: 13px; font-weight: 700; color: var(--accent); }
.insight-time { font-size: 11px; color: var(--text-muted); margin-left: auto; }
.insight-text { font-size: 13px; color: var(--text-secondary); line-height: 1.65; }

/* ---- CHAT PANEL (RIGHT) ---- */
.chat-panel {
  position: fixed; right: 0; top: 0; bottom: 0;
  width: 380px;
  background: var(--bg-chat);
  backdrop-filter: var(--glass-blur);
  border-left: var(--glass-border);
  box-shadow: -8px 0 32px rgba(0,0,0,0.08);
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.4,0,0.2,1);
  z-index: 20;
  display: flex; flex-direction: column;
}
.chat-panel.open { transform: translateX(0); }

.chat-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.chat-title { font-size: 15px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.chat-close {
  background: none; border: none; font-size: 20px;
  color: var(--text-muted); cursor: pointer;
  padding: 4px 8px; border-radius: 6px; transition: all 0.2s;
}
.chat-close:hover { background: var(--accent-light); color: var(--text-primary); }

.chat-messages { flex: 1; overflow-y: auto; padding: 16px 20px; }
.chat-msg { margin-bottom: 14px; max-width: 85%; }
.chat-msg.bot { margin-right: auto; }
.chat-msg.user { margin-left: auto; }
.chat-bubble {
  padding: 10px 14px; border-radius: 14px;
  font-size: 13px; line-height: 1.5;
}
.chat-msg.bot .chat-bubble {
  background: var(--bg-card);
  border: var(--glass-border);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}
.chat-msg.user .chat-bubble {
  background: var(--chat-user-bg);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.chat-input-area {
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  display: flex; gap: 8px;
}
.chat-input {
  flex: 1; background: var(--bg-card);
  border: var(--glass-border);
  border-radius: 10px; padding: 10px 14px;
  font-size: 13px; color: var(--text-primary);
  outline: none; transition: border 0.2s;
  font-family: inherit;
}
.chat-input::placeholder { color: var(--text-muted); }
.chat-input:focus { border-color: var(--accent); }
.chat-send {
  background: var(--accent);
  border: none; border-radius: 10px;
  padding: 10px 16px; color: #fff;
  font-size: 14px; cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 2px 8px var(--accent-shadow);
}
.chat-send:hover { transform: translateY(-1px); }

.wa-badge {
  display: inline-flex; align-items: center; gap: 4px;
  background: rgba(37,211,102,0.1); color: #25D366;
  font-size: 10px; font-weight: 600;
  padding: 2px 8px; border-radius: 10px;
}

/* ---- CHAT TOGGLE ---- */
.chat-toggle {
  position: fixed; right: 20px; bottom: 20px;
  width: 52px; height: 52px;
  background: var(--accent);
  border: none; border-radius: 16px;
  color: #fff; font-size: 22px;
  cursor: pointer;
  box-shadow: 0 4px 20px var(--accent-shadow);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  z-index: 25;
  display: flex; align-items: center; justify-content: center;
}
.chat-toggle:hover { transform: scale(1.06); box-shadow: 0 6px 28px var(--accent-shadow); }
.chat-toggle.active { background: #666; border-radius: 14px; }

/* ---- ANIMATIONS ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.5s cubic-bezier(0.4,0,0.2,1) forwards; }
.delay-1 { animation-delay: 0.06s; opacity: 0; }
.delay-2 { animation-delay: 0.12s; opacity: 0; }
.delay-3 { animation-delay: 0.18s; opacity: 0; }
.delay-4 { animation-delay: 0.24s; opacity: 0; }
.delay-5 { animation-delay: 0.30s; opacity: 0; }

/* Smooth transitions on theme change */
body, .sidebar, .main, .nav-item, .scorecard, .glass-card, .filter-chip, .btn-primary, .chat-panel, .chat-toggle, .chat-bubble, .chat-input, .chat-send, .chat-close, .insight-card, .theme-btn, .data-table tbody td {
  transition-property: background-color, border-color, color, box-shadow, transform;
  transition-duration: 0.35s;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}
.bar, .progress-fill { transition-property: background-color, width, transform; }
canvas, canvas * { transition: none !important; }

/* ---- LOADING SPINNER ---- */
.loading-spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- HIERARCHY TREE ---- */
.hier-node { margin-left: 0; }
.hier-depth-0 { margin-left: 0; }
.hier-depth-1 { margin-left: 20px; }
.hier-depth-2 { margin-left: 20px; }
.hier-depth-3 { margin-left: 20px; }
.hier-depth-4 { margin-left: 20px; }
.hier-summary { cursor: pointer; padding: 6px 10px; border-radius: 8px; display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text); }
.hier-summary:hover { background: var(--glass-bg); }
.hier-badge { display: inline-block; padding: 2px 8px; border-radius: 6px; font-size: 11px; font-weight: 600; background: var(--accent); color: #fff; min-width: 28px; text-align: center; }
.hier-name { font-weight: 600; }
.hier-count { font-size: 11px; color: var(--text-muted); margin-left: auto; }
.hier-children { border-left: 1px solid var(--border); margin-left: 14px; padding-left: 6px; }
.hier-leaf { padding: 6px 12px; font-size: 12px; border-bottom: 1px solid var(--border); }
.hier-leaf:last-child { border-bottom: none; }
.hier-leaf strong { color: var(--text); font-size: 13px; }
.hier-meta { display: block; color: var(--text-muted); font-size: 11px; margin-top: 2px; }

/* ---- DATA TABLE (shared) ---- */
.data-table { border-collapse: collapse; }
.data-table th { padding: 8px 10px; text-align: left; font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-muted); border-bottom: 2px solid var(--border); }
.data-table td { padding: 7px 10px; border-bottom: 1px solid var(--border); color: var(--text); }
.data-table tr:hover td { background: var(--glass-bg); }

/* ---- CHAT BUBBLE MARKDOWN ---- */
.chat-bubble table { border-radius: 6px; overflow: hidden; }
.chat-bubble table th { background: var(--table-header); }
.chat-bubble table tr:hover td { background: var(--table-hover); }
.chat-bubble strong { color: var(--accent); }
.chat-bubble ul { margin: 4px 0; padding-left: 16px; }
.chat-bubble li { margin: 2px 0; }
.chat-bubble code { background: var(--accent-light); padding: 1px 4px; border-radius: 3px; font-size: 12px; }

/* ========================================================================
   HAMBURGER MENU + PAGE TRANSITIONS (2026-04-10)
   Sidebar slides in/out on hamburger click. Main content stays put.
   ======================================================================== */

/* ---- Hamburger button ---- */
.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 22px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  margin-right: 16px;
  flex-shrink: 0;
}
.hamburger-btn span {
  display: block;
  width: 100%;
  height: 2.5px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s;
}
body.sidebar-open .hamburger-btn span:nth-child(1) {
  transform: translateY(9.5px) rotate(45deg);
}
body.sidebar-open .hamburger-btn span:nth-child(2) {
  opacity: 0;
}
body.sidebar-open .hamburger-btn span:nth-child(3) {
  transform: translateY(-9.5px) rotate(-45deg);
}

/* ---- Sidebar: hidden by default, slides in when body.sidebar-open ---- */
.sidebar {
  position: fixed !important;
  top: 0;
  left: 0;
  height: 100vh;
  overflow-y: auto;
  transform: translateX(-100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), background 0.5s ease !important;
  z-index: 1000 !important;
  box-shadow: 4px 0 24px rgba(0, 0, 0, 0.4);
}
body.sidebar-open .sidebar {
  transform: translateX(0);
}

/* ---- Main content: full width since sidebar is now overlay ---- */
.main {
  margin-left: 0 !important;
  width: 100% !important;
  flex: 1 !important;
}

/* ---- Sidebar backdrop ---- */
.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 999;
}
body.sidebar-open .sidebar-backdrop {
  opacity: 1;
  visibility: visible;
}

/* ---- Page curtain transition ----
   IMPORTANT: Do NOT use transform or filter on .page-content-wrapper directly —
   that creates a containing block for position:fixed children (e.g. #brain-cc)
   and breaks their viewport anchoring. Apply transform to an inner wrapper only
   if needed. For now, opacity-only keeps it safe for all pages. */
@keyframes pageCurtainIn {
  0%   { opacity: 0; }
  40%  { opacity: 0.6; }
  100% { opacity: 1; }
}
.page-content-wrapper {
  animation: pageCurtainIn 0.45s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity;
}
.page-content-wrapper.transitioning {
  animation: pageCurtainIn 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---- Prevent scroll when sidebar open on small screens ---- */
body.sidebar-open {
  overflow: hidden;
}

/* ---- Topbar: add spacing so hamburger isn't flush to edge ---- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}