:root {
  --bg-0: #020617;
  --glass: rgba(15, 23, 42, 0.62);
  --glass-2: rgba(30, 41, 59, 0.5);
  --border: rgba(148, 163, 184, 0.28);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --primary: #22d3ee;
  --ease-smooth: cubic-bezier(0.22, 1, 0.36, 1);
}

html {
  scroll-behavior: smooth;
}

* {
  transition: background-color .25s var(--ease-smooth),
              border-color .25s var(--ease-smooth),
              color .25s var(--ease-smooth),
              box-shadow .25s var(--ease-smooth),
              transform .25s var(--ease-smooth),
              opacity .25s var(--ease-smooth);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

body.glass-bg {
  background:
    radial-gradient(900px 500px at 10% 10%, rgba(34, 211, 238, 0.16), transparent 55%),
    radial-gradient(700px 420px at 90% 20%, rgba(167, 139, 250, 0.14), transparent 58%),
    radial-gradient(800px 500px at 40% 90%, rgba(52, 211, 153, 0.12), transparent 60%),
    var(--bg-0);
  background-size: 140% 140%;
  animation: bgFloat 16s ease-in-out infinite alternate;
}

main, aside, section, nav, form, table, .glass-card {
  animation: fadeSlideIn .5s var(--ease-smooth) both;
}

.session-item {
  transform: translateZ(0) scale(1);
}
.session-item:hover {
  transform: translateY(-1px) scale(1.01);
}
.session-item-active {
  animation: activePop .34s var(--ease-smooth);
  box-shadow: 0 8px 20px rgba(34, 211, 238, .14);
}

.msg-enter-user {
  animation: msgInUser .26s var(--ease-smooth);
}
.msg-enter-assistant {
  animation: msgInAssistant .30s var(--ease-smooth);
}

@keyframes activePop {
  0% { transform: scale(.98); }
  60% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

@keyframes msgInUser {
  from { opacity: 0; transform: translateX(10px) translateY(4px); }
  to { opacity: 1; transform: translateX(0) translateY(0); }
}

@keyframes msgInAssistant {
  from { opacity: 0; transform: translateX(-10px) translateY(4px); }
  to { opacity: 1; transform: translateX(0) translateY(0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bgFloat {
  0% { background-position: 0% 0%, 100% 0%, 50% 100%, 0 0; }
  100% { background-position: 10% 10%, 85% 15%, 40% 80%, 0 0; }
}

.glass-card {
  background: linear-gradient(180deg, var(--glass), var(--glass-2));
  border: 1px solid var(--border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 12px 36px rgba(2, 6, 23, 0.38);
}

.glass-input {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(148, 163, 184, 0.35);
  color: var(--text);
}
.glass-input:focus {
  outline: none;
  border-color: rgba(34, 211, 238, 0.9);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.16);
  animation: inputGlow 1.8s ease-in-out infinite;
}

@keyframes inputGlow {
  0%, 100% { box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.10), 0 0 0 0 rgba(34, 211, 238, 0.00); }
  50% { box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.22), 0 0 24px rgba(34, 211, 238, 0.20); }
}

.glass-btn {
  background: rgba(30, 41, 59, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.3);
}
.glass-btn:hover {
  background: rgba(51, 65, 85, 0.9);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(34, 211, 238, 0.18);
}

.glass-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}
.glass-table thead tr {
  background: rgba(15, 23, 42, 0.7);
}
.glass-table thead th {
  color: #cbd5e1;
  font-weight: 600;
}
.glass-table tbody tr {
  background: rgba(15, 23, 42, 0.35);
  position: relative;
}
.glass-table tbody tr::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: linear-gradient(180deg, rgba(34,211,238,.6), rgba(167,139,250,.6));
  transition: width .25s var(--ease-smooth), opacity .25s var(--ease-smooth);
  opacity: 0;
}
.glass-table tbody tr:hover {
  background: rgba(30, 41, 59, 0.55);
}
.glass-table tbody tr:hover::before {
  width: 3px;
  opacity: 1;
}

.glass-alert-success {
  background: rgba(16, 185, 129, 0.18);
  border: 1px solid rgba(52, 211, 153, 0.35);
  color: #a7f3d0;
}

.glass-alert-error {
  background: rgba(239, 68, 68, 0.16);
  border: 1px solid rgba(248, 113, 113, 0.35);
  color: #fecaca;
}