:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-2: #f8f9fa;
  --border: #e3e5e8;
  --border-strong: #cdd1d6;
  --text: #1f2328;
  --text-muted: #5b6470;
  --accent: #ff6b6b;
  --accent-2: #f99468;
  --primary: #0f3460;
  --primary-2: #1a3a6b;
  --success: #198754;
  --warning: #f59e0b;
  --danger: #dc3545;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.06), 0 1px 1px rgba(15,23,42,.04);
  --shadow: 0 4px 12px rgba(15,23,42,.08);
  --shadow-lg: 0 18px 50px rgba(15,23,42,.18);
  --gap: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main {
  max-width: 1380px;
  margin: 0 auto;
  padding: 24px 24px 80px;
}

.app-header {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 14px;
  padding: 12px 24px;
  background: linear-gradient(90deg, #f75964 0%, #f99468 100%);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,.12);
  transition: background .25s ease;
}
body.ctx-signbank .app-header {
  background: linear-gradient(90deg, #1c7ed6 0%, #4dabf7 100%);
}

.context-toggle {
  display: inline-flex;
  background: rgba(0,0,0,.18);
  border-radius: 999px;
  padding: 3px;
  position: relative;
}
.context-toggle .ctx-opt {
  border: 0;
  background: transparent;
  color: rgba(255,255,255,.78);
  padding: 6px 14px;
  font: inherit;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .3px;
  cursor: pointer;
  border-radius: 999px;
  display: inline-flex; align-items: center; gap: 6px;
  transition: background .18s ease, color .18s ease;
}
.context-toggle .ctx-opt i { font-size: 11px; }
.context-toggle .ctx-opt:hover { color: #fff; }
.context-toggle .ctx-opt.active {
  background: #fff;
  color: var(--accent);
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
}
body.ctx-signbank .context-toggle .ctx-opt.active { color: var(--primary); }

.dataset-switcher {
  display: inline-flex;
  gap: 4px;
  margin-left: 8px;
}
.dataset-switcher .ds-btn {
  padding: 4px 10px;
  border: 1px solid rgba(255,255,255,.45);
  background: transparent;
  color: rgba(255,255,255,.78);
  font: inherit;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  border-radius: 999px;
  transition: background .18s ease, color .18s ease;
}
.dataset-switcher .ds-btn:hover { color: #fff; background: rgba(255,255,255,.12); }
.dataset-switcher .ds-btn.active {
  background: #fff;
  color: var(--accent);
  border-color: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
}
body.ctx-signbank .dataset-switcher .ds-btn.active { color: var(--primary); }

.app-header .btn-burger {
  margin-right: 10px;
  width: 40px; height: 40px;
  border: 0;
  background: rgba(255,255,255,.15);
  color: #fff;
  border-radius: 8px;
  cursor: pointer;
  font-size: 18px;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background .12s;
}
.app-header .btn-burger:hover { background: rgba(255,255,255,.28); }
.app-header .btn-burger:active { transform: translateY(1px); }
.app-header .brand { display: flex; align-items: baseline; gap: 10px; font-weight: 700; font-size: 18px; letter-spacing: .3px; }
.app-header .user { margin-left: auto; }
.app-header .brand i { font-size: 22px; }
.app-header .brand .tag {
  font-weight: 500; font-size: 11px; opacity: .85;
  background: rgba(255,255,255,.15); padding: 3px 8px; border-radius: 999px;
  text-transform: uppercase; letter-spacing: .5px;
}
.app-header .user { display: flex; align-items: center; gap: 12px; font-size: 13px; }
.app-header .btn-logout {
  color: #fff; background: rgba(255,255,255,.15);
  border-radius: 8px; padding: 6px 10px; transition: background .15s;
}
.app-header .btn-logout:hover { background: rgba(255,255,255,.28); }

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font: inherit;
  transition: background .15s, border-color .15s, transform .05s;
}
.btn:hover { background: var(--surface-2); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--primary); color: #fff; border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-2); }
.btn-danger {
  background: var(--danger); color: #fff; border-color: var(--danger);
}
.btn-danger:hover { filter: brightness(.92); }
.btn-link {
  background: transparent; border-color: transparent; color: var(--primary);
}
.btn-link:hover { background: rgba(15,52,96,.06); }
.btn-sm { padding: 4px 10px; font-size: 12.5px; }
.btn-icon {
  width: 32px; height: 32px; padding: 0; justify-content: center;
}

.req { color: var(--danger); }

.overscroll-drop {
  position: fixed;
  left: 50%;
  --fill: 0;
  --size: calc(34px + var(--fill) * 70px);
  z-index: 80;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0;
  transform: translateX(-50%) translateY(0) scale(.6);
  transition: opacity .25s ease, transform .35s cubic-bezier(.4,1.4,.5,1);
  background: transparent;
  border: 0;
  padding: 0;
  font: inherit;
}
.overscroll-drop.top    { top: 16px;    flex-direction: column-reverse; }
.overscroll-drop.bottom { bottom: 16px; }
.overscroll-drop.active {
  opacity: 1;
  transform: translateX(-50%) translateY(0) scale(1);
}

.overscroll-drop .drop-shape {
  position: relative;
  width: var(--size);
  height: calc(var(--size) * 1.18);
  transition: width .12s ease-out, height .12s ease-out;
  filter: drop-shadow(0 6px 14px rgba(15,52,96,.18));
}
.overscroll-drop .drop-shape::before {
  content: '';
  position: absolute; inset: 0;
  background: rgba(255,255,255,.92);
  border: 2px solid rgba(15,52,96,.55);
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
  backdrop-filter: blur(4px);
}
.overscroll-drop.top .drop-shape::before {
  border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%;
}
.overscroll-drop .drop-water {
  position: absolute;
  left: 6%; right: 6%; bottom: 6%;
  height: calc(var(--fill) * 88%);
  background: linear-gradient(180deg, rgba(15,52,96,.85), var(--primary));
  border-radius: 50% 50% 50% 50% / 35% 35% 50% 50%;
  transition: height .12s linear, background .2s;
}
.overscroll-drop.top .drop-water {
  top: 6%; bottom: auto;
  background: linear-gradient(0deg, rgba(15,52,96,.85), var(--primary));
}
.overscroll-drop .drop-icon {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  font-size: calc(12px + var(--fill) * 16px);
  color: rgba(15,52,96,.7);
  transition: color .15s, transform .15s;
  z-index: 1;
}
.overscroll-drop.ready {
  cursor: pointer;
  pointer-events: auto;
}
.overscroll-drop.ready .drop-shape::before {
  border-color: var(--success);
  animation: drop-pop .4s cubic-bezier(.34,1.56,.64,1), drop-pulse 1.6s ease-in-out 0.4s infinite;
}
.overscroll-drop.ready .drop-water { background: var(--success); }
.overscroll-drop.ready .drop-icon  { color: #fff; transform: translate(-50%, -50%) scale(1.18); }
.overscroll-drop.ready:hover .drop-shape { filter: drop-shadow(0 8px 18px rgba(25,135,84,.45)); }
.overscroll-drop.ready:hover .drop-shape::before { border-width: 3px; }
@keyframes drop-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(25,135,84,.5); }
  50%      { box-shadow: 0 0 0 12px rgba(25,135,84,0); }
}
@keyframes drop-pop {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.12); }
  100% { transform: scale(1); }
}

.overscroll-drop .drop-label {
  background: rgba(255,255,255,.96);
  border: 1px solid var(--border);
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  display: inline-flex; align-items: center; gap: 8px;
  box-shadow: 0 4px 12px rgba(15,23,42,.08);
}
.overscroll-drop .drop-page {
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--surface-2);
  padding: 1px 8px;
  border-radius: 999px;
}
.overscroll-drop.ready .drop-label { color: var(--success); }
.overscroll-drop.ready .drop-page  { background: rgba(25,135,84,.14); color: var(--success); }

/* Navigation drawer */
.nav-drawer {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: min(88vw, 340px);
  background: var(--surface);
  z-index: 200;
  display: flex; flex-direction: column;
  box-shadow: 0 12px 40px rgba(15,23,42,.25);
  transform: translateX(0);
  transition: transform .25s cubic-bezier(.4,1.4,.5,1);
}
.nav-drawer.hidden {
  transform: translateX(-105%);
  pointer-events: none;
}
.nav-drawer-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 18px;
  background: linear-gradient(90deg, #f75964 0%, #f99468 100%);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .3px;
}
.nav-drawer-head .close {
  width: 30px; height: 30px;
  border: 0; background: rgba(255,255,255,.2); color: #fff;
  border-radius: 50%; cursor: pointer;
  font-size: 18px; line-height: 1;
}
.nav-drawer-head .close:hover { background: rgba(255,255,255,.35); }
.nav-drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0 16px;
}
.nav-drawer-body section {
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}
.nav-drawer-body section:last-child { border-bottom: 0; }
.nav-drawer-body section[hidden] { display: none; }
.nav-drawer-body h4 {
  margin: 8px 18px 6px;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: .6px;
  color: var(--text-muted);
  font-weight: 700;
}
.nav-drawer-body a {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 18px;
  font-size: 13px;
  color: var(--text);
  text-decoration: none;
  transition: background .12s, color .12s;
}
.nav-drawer-body a:hover { background: var(--surface-2); color: var(--primary); }
.nav-drawer-body a i {
  width: 18px;
  text-align: center;
  color: var(--text-muted);
  flex-shrink: 0;
}
.nav-drawer-body a:hover i { color: var(--primary); }
.nav-drawer-body a.logout { color: var(--danger); }
.nav-drawer-body a.logout i { color: var(--danger); }
.nav-drawer-body a.logout:hover { background: #fdecec; color: var(--danger); }

.nav-drawer-overlay {
  position: fixed; inset: 0;
  background: rgba(15,23,42,.45);
  z-index: 199;
  opacity: 1;
  transition: opacity .2s;
}
.nav-drawer-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.toast-stack {
  position: fixed; right: 18px; bottom: 18px; z-index: 1000;
  display: flex; flex-direction: column; gap: 8px;
}
.toast {
  background: #1f2328; color: #fff;
  padding: 10px 14px; border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  font-size: 13px;
  max-width: 320px;
  animation: toast-in .2s ease-out;
}
.toast.success { background: var(--success); }
.toast.error   { background: var(--danger); }
@keyframes toast-in { from { transform: translateY(8px); opacity: 0 } to { transform: none; opacity: 1 } }