/* ============================================================
   AI Assistant — chatbot tra loi cau hoi tai lieu (goc duoi phai)
   Mau nen do EduPath + logo dinh kem.
   ============================================================ */

:root {
  /* Đỏ EduPath đã làm dịu — bớt chói */
  --ai-red: #df4b43;
  --ai-red-dark: #c0392b;
  --ai-red-deep: #a5352d;
  --ai-navy: #20296b;
  --ai-panel-bg: #ffffff;
  --ai-panel-fg: #1f2330;
  --ai-bot-bubble: #fceceb;
  --ai-user-bubble: #df4b43;
  --ai-border: #f2dad8;
  --ai-muted: #6b7280;
  --ai-shadow: 0 18px 48px rgba(165, 53, 45, 0.26), 0 4px 14px rgba(0, 0, 0, 0.14);
}

[data-md-color-scheme="slate"] {
  --ai-panel-bg: #22212b;
  --ai-panel-fg: #eceded;
  --ai-bot-bubble: #33232a;
  --ai-user-bubble: #df4b43;
  --ai-border: #4a3238;
  --ai-muted: #b3b3bd;
  --ai-shadow: 0 18px 48px rgba(0, 0, 0, 0.55), 0 4px 14px rgba(0, 0, 0, 0.4);
}

/* --- Nut noi (FAB) goc duoi phai --- */
.ai-fab {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 1000;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px 10px 12px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--ai-red) 0%, var(--ai-red-deep) 100%);
  color: #fff;
  font-family: var(--md-text-font-family, "Be Vietnam Pro", "Segoe UI", sans-serif);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  box-shadow: var(--ai-shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease;
}

.ai-fab:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 54px rgba(165, 18, 23, 0.4), 0 6px 18px rgba(0, 0, 0, 0.18);
}

.ai-fab:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 2px;
}

/* --- Vòng sáng chạy quanh nút chat cho sinh động --- */
@property --ai-ring-angle {
  syntax: "<angle>";
  inherits: false;
  initial-value: 0deg;
}

.ai-fab::before {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: inherit;
  z-index: -1;
  background: conic-gradient(
    from var(--ai-ring-angle, 0deg),
    rgba(255, 255, 255, 0) 0deg,
    rgba(255, 255, 255, 0) 205deg,
    rgba(255, 224, 138, 0.85) 265deg,
    #ffffff 305deg,
    rgba(255, 224, 138, 0.85) 348deg,
    rgba(255, 255, 255, 0) 360deg
  );
  filter: blur(0.4px);
  animation: ai-fab-ring 2.6s linear infinite;
}

/* Quầng sáng mờ nhấp nháy nhẹ phía sau — thêm chiều sâu */
.ai-fab::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: inherit;
  z-index: -2;
  box-shadow: 0 0 0 0 rgba(255, 210, 120, 0.55);
  animation: ai-fab-glow 2.6s ease-in-out infinite;
}

@keyframes ai-fab-ring {
  to {
    --ai-ring-angle: 360deg;
  }
}

@keyframes ai-fab-glow {
  0%,
  100% {
    box-shadow: 0 0 6px 1px rgba(255, 200, 110, 0.35);
  }
  50% {
    box-shadow: 0 0 14px 3px rgba(255, 210, 120, 0.55);
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-fab::before,
  .ai-fab::after {
    animation: none;
  }
}

.ai-fab__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: #fff;
  flex: 0 0 auto;
}

.ai-fab__badge img {
  width: 20px;
  height: 20px;
  display: block;
  pointer-events: none;
}

.ai-fab__label {
  white-space: nowrap;
}

.ai-fab[hidden] {
  display: none;
}

/* --- Khung chat --- */
.ai-panel {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 1001;
  width: min(390px, calc(100vw - 32px));
  height: min(620px, calc(100vh - 40px));
  display: flex;
  flex-direction: column;
  background: var(--ai-panel-bg);
  color: var(--ai-panel-fg);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--ai-shadow);
  font-family: var(--md-text-font-family, "Be Vietnam Pro", "Segoe UI", sans-serif);
  transform-origin: bottom right;
  animation: ai-pop 0.2s ease;
}

@keyframes ai-pop {
  from { opacity: 0; transform: translateY(12px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.ai-panel[hidden] {
  display: none;
}

/* Header do */
.ai-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: linear-gradient(135deg, var(--ai-red) 0%, var(--ai-red-deep) 100%);
  color: #fff;
}

.ai-header__logo {
  display: inline-flex;
  align-items: center;
  background: #fff;
  border-radius: 7px;
  padding: 4px 8px;
  flex: 0 0 auto;
}

.ai-header__logo img {
  height: 20px;
  width: auto;
  display: block;
  pointer-events: none;
}

.ai-header__titles {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  flex: 1 1 auto;
  min-width: 0;
}

.ai-header__title {
  font-size: 0.98rem;
  font-weight: 800;
}

.ai-header__subtitle {
  font-size: 0.72rem;
  opacity: 0.9;
  font-weight: 500;
}

.ai-header__close {
  background: rgba(255, 255, 255, 0.16);
  border: none;
  color: #fff;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  flex: 0 0 auto;
  transition: background 0.15s ease;
}

.ai-header__close:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Vung tin nhan */
.ai-body {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scrollbar-width: thin;
  scrollbar-color: var(--ai-red) transparent;
}

.ai-body::-webkit-scrollbar { width: 8px; }
.ai-body::-webkit-scrollbar-thumb {
  background: rgba(225, 37, 27, 0.4);
  border-radius: 4px;
}

.ai-msg {
  max-width: 88%;
  padding: 10px 13px;
  border-radius: 14px;
  font-size: 0.86rem;
  line-height: 1.5;
  word-wrap: break-word;
}

.ai-msg--bot {
  align-self: flex-start;
  background: var(--ai-bot-bubble);
  border: 1px solid var(--ai-border);
  border-bottom-left-radius: 4px;
}

.ai-msg--user {
  align-self: flex-end;
  background: var(--ai-user-bubble);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.ai-msg p { margin: 0 0 6px; }
.ai-msg p:last-child { margin-bottom: 0; }
.ai-msg mark {
  background: #ffe08a;
  color: inherit;
  padding: 0 2px;
  border-radius: 3px;
}

/* Danh sach ket qua co the click */
.ai-results {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin-top: 8px;
}

.ai-result {
  display: block;
  padding: 8px 11px;
  border-radius: 10px;
  background: var(--ai-panel-bg);
  border: 1px solid var(--ai-border);
  text-decoration: none !important;
  color: var(--ai-panel-fg) !important;
  transition: border-color 0.15s ease, transform 0.12s ease, box-shadow 0.15s ease;
}

.ai-result:hover {
  border-color: var(--ai-red);
  transform: translateX(2px);
  box-shadow: 0 3px 10px rgba(225, 37, 27, 0.14);
}

.ai-result__title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--ai-red-dark);
}

[data-md-color-scheme="slate"] .ai-result__title {
  color: #ff7a70;
}

.ai-result__title::before {
  content: "📄";
  font-size: 0.85rem;
}

.ai-result__crumb {
  display: block;
  margin-top: 2px;
  font-size: 0.72rem;
  color: var(--ai-muted);
}

/* Goi y cau hoi (chips) */
.ai-suggests {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 10px;
}

.ai-chip {
  border: 1px solid var(--ai-red);
  background: transparent;
  color: var(--ai-red-dark);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s ease, color 0.15s ease;
}

.ai-chip:hover {
  background: var(--ai-red);
  color: #fff;
}

[data-md-color-scheme="slate"] .ai-chip {
  color: #ff8a80;
  border-color: #ff8a80;
}

[data-md-color-scheme="slate"] .ai-chip:hover {
  background: #ff8a80;
  color: #22212b;
}

/* Trang thai "dang go" */
.ai-typing {
  display: inline-flex;
  gap: 4px;
  align-items: center;
}

.ai-typing span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ai-red);
  opacity: 0.5;
  animation: ai-blink 1s infinite;
}

.ai-typing span:nth-child(2) { animation-delay: 0.2s; }
.ai-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes ai-blink {
  0%, 100% { opacity: 0.25; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-2px); }
}

/* O nhap lieu */
.ai-input {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--ai-border);
  background: var(--ai-panel-bg);
}

.ai-input textarea {
  flex: 1 1 auto;
  resize: none;
  border: 1px solid var(--ai-border);
  border-radius: 12px;
  padding: 9px 12px;
  font-family: inherit;
  font-size: 0.85rem;
  line-height: 1.4;
  max-height: 96px;
  color: var(--ai-panel-fg);
  background: var(--md-default-bg-color, #fff);
  outline: none;
  transition: border-color 0.15s ease;
}

.ai-input textarea:focus {
  border-color: var(--ai-red);
}

.ai-send {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: var(--ai-red);
  color: #fff;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, transform 0.12s ease;
}

.ai-send:hover { background: var(--ai-red-dark); transform: scale(1.05); }
.ai-send:disabled { opacity: 0.5; cursor: default; transform: none; }
.ai-send svg { width: 20px; height: 20px; fill: currentColor; }

.ai-footnote {
  text-align: center;
  font-size: 0.68rem;
  color: var(--ai-muted);
  padding: 0 12px 8px;
  background: var(--ai-panel-bg);
}

/* Man hinh nho: chat gan full */
@media (max-width: 480px) {
  .ai-panel {
    right: 10px;
    left: 10px;
    bottom: 10px;
    width: auto;
    height: min(80vh, calc(100vh - 20px));
  }
  .ai-fab { right: 14px; bottom: 14px; }
  .ai-fab__label { display: none; }
  .ai-fab { padding: 12px; }
}