/* Virtual AI Tutor - clean minimal card layout (frontend + admin). */

.aitutor-wrap { --ait-primary: #2563eb; --ait-ok: #16a34a; --ait-bad: #dc2626; --ait-line: #e5e7eb; --ait-ink: #111827; --ait-mut: #6b7280; max-width: 1200px; margin: 0 auto; font-size: 16px; color: var(--ait-ink); }
.aitutor-card { background: #fff; border: 1px solid var(--ait-line); border-radius: 10px; padding: 18px 20px; box-shadow: 0 1px 2px rgba(0,0,0,.04); }
.aitutor-wrap .aitutor-card + .aitutor-card { margin-top: 14px; }

/* Header */
.aitutor-header .aitutor-title { margin: 0 0 8px; font-size: 1.5rem; }
.aitutor-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.aitutor-badge { display: inline-block; background: #eff6ff; color: #1d4ed8; border: 1px solid #dbeafe; border-radius: 999px; padding: 2px 10px; font-size: 12px; }
.aitutor-actions { display: flex; flex-wrap: wrap; gap: 8px; }

/* Buttons */
.aitutor-btn { appearance: none; border: 1px solid var(--ait-line); background: #f9fafb; color: var(--ait-ink); border-radius: 8px; padding: 8px 14px; font-size: 14px; cursor: pointer; }
.aitutor-btn:hover:not(:disabled) { background: #f3f4f6; }
.aitutor-btn:disabled { opacity: .5; cursor: not-allowed; }
.aitutor-btn-primary { background: var(--ait-primary); border-color: var(--ait-primary); color: #fff; }
.aitutor-btn-primary:hover:not(:disabled) { background: #1d4ed8; }
.aitutor-icon-btn { appearance: none; border: 1px solid var(--ait-line); background: #fff; border-radius: 6px; width: 32px; height: 30px; line-height: 1; cursor: pointer; font-size: 13px; }
.aitutor-icon-btn:hover { background: #f3f4f6; }

/* Grid: outline sidebar + main panel */
.aitutor-grid { display: grid; grid-template-columns: 290px 1fr; gap: 14px; margin-top: 14px; align-items: start; }
.aitutor-sidebar { position: sticky; top: 12px; max-height: calc(100vh - 24px); overflow: auto; }
.aitutor-sidebar-title { margin: 0 0 10px; font-size: 1rem; }
.aitutor-outline { list-style: none; margin: 0; padding: 0; }
.aitutor-outline-item { border: 1px solid var(--ait-line); border-radius: 8px; padding: 8px 10px; margin-bottom: 6px; cursor: pointer; transition: border-color .15s, background .15s; }
.aitutor-outline-item:hover { border-color: #bfdbfe; background: #f8faff; }
.aitutor-outline-item.is-active { border-color: var(--ait-primary); background: #eff6ff; box-shadow: inset 3px 0 0 var(--ait-primary); }
.aitutor-outline-item.is-completed { background: #f0fdf4; border-color: #bbf7d0; }
.aitutor-outline-item.is-locked { opacity: .55; cursor: not-allowed; }
.aitutor-outline-head { display: flex; justify-content: space-between; gap: 6px; align-items: baseline; }
.aitutor-outline-title { font-weight: 600; font-size: 14px; }
.aitutor-outline-status { font-size: 11px; border-radius: 999px; padding: 1px 8px; white-space: nowrap; background: #f3f4f6; color: var(--ait-mut); }
.aitutor-outline-status.s-in_progress { background: #fef3c7; color: #92400e; }
.aitutor-outline-status.s-completed { background: #dcfce7; color: #166534; }
.aitutor-subtopics { margin: 6px 0 0; padding-left: 16px; font-size: 12px; color: var(--ait-mut); }
.aitutor-outline-empty { color: var(--ait-mut); font-size: 13px; }
.aitutor-summary { margin-top: 12px; border-top: 1px solid var(--ait-line); padding-top: 10px; font-size: 13px; }
.aitutor-summary-row { display: flex; justify-content: space-between; gap: 8px; padding: 2px 0; }
.aitutor-summary-label { color: var(--ait-mut); }
.aitutor-summary-value { font-weight: 600; text-align: right; }
.aitutor-bar { height: 8px; background: #eef2f7; border-radius: 999px; overflow: hidden; margin-top: 8px; }
.aitutor-bar span { display: block; height: 100%; background: var(--ait-primary); border-radius: 999px; }

/* Voice bar */
.aitutor-voicebar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding: 10px 14px; }
.aitutor-voicebar.is-disabled { opacity: .6; }
.aitutor-voice-label { font-size: 13px; font-weight: 600; color: var(--ait-mut); }
.aitutor-toggle { font-size: 13px; color: var(--ait-ink); display: inline-flex; gap: 4px; align-items: center; }
.aitutor-voice-status { font-size: 12px; color: var(--ait-mut); }
.aitutor-spinner { width: 14px; height: 14px; border: 2px solid #dbeafe; border-top-color: var(--ait-primary); border-radius: 50%; display: inline-block; animation: ait-spin .8s linear infinite; }
@keyframes ait-spin { to { transform: rotate(360deg); } }

/* Lesson card */
.aitutor-lesson:empty { display: none; }
.aitutor-lesson-head { border-bottom: 1px solid var(--ait-line); padding-bottom: 10px; margin-bottom: 12px; }
.aitutor-chip { display: inline-block; font-size: 11px; text-transform: uppercase; letter-spacing: .04em; background: #ede9fe; color: #5b21b6; border-radius: 999px; padding: 2px 9px; margin-bottom: 6px; }
.aitutor-lesson-title { margin: 0; font-size: 1.3rem; }
.aitutor-lesson-topic { color: var(--ait-mut); font-size: 13px; margin-top: 4px; }
.aitutor-lesson-section { margin: 16px 0; }
.aitutor-section-title { margin: 0 0 8px; font-size: 1rem; border-left: 3px solid var(--ait-primary); padding-left: 8px; }
.aitutor-prose p { margin: 0 0 10px; line-height: 1.65; }
.aitutor-list { margin: 0; padding-left: 20px; line-height: 1.6; }
.aitutor-step { display: flex; gap: 10px; border: 1px solid var(--ait-line); border-radius: 8px; padding: 10px 12px; margin-bottom: 8px; }
.aitutor-step-num { flex: 0 0 26px; height: 26px; border-radius: 50%; background: var(--ait-primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 700; }
.aitutor-step-body p { margin: 4px 0 0; color: #374151; font-size: 14px; }
.aitutor-example { border: 1px solid var(--ait-line); border-radius: 8px; padding: 12px 14px; margin-bottom: 10px; background: #fafafa; }
.aitutor-example h4 { margin: 0 0 6px; }
.aitutor-pre { white-space: pre-wrap; word-break: break-word; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; background: #f3f4f6; border-radius: 6px; padding: 10px 12px; margin: 0; line-height: 1.5; }
.aitutor-answer { margin: 8px 0 0; color: #14532d; }
.aitutor-warn { border: 1px dashed #fcd34d; background: #fffbeb; border-radius: 8px; padding: 10px 12px; font-size: 14px; }

/* Quiz */
.aitutor-quiz { border-top: 2px dashed var(--ait-line); padding-top: 14px; }
.aitutor-quiz-meta { color: var(--ait-mut); font-size: 13px; margin: 0 0 10px; }
.aitutor-q { border: 1px solid var(--ait-line); border-radius: 8px; padding: 12px 14px; margin: 0 0 10px; }
.aitutor-q.is-correct { border-color: #86efac; background: #f0fdf4; }
.aitutor-q.is-wrong { border-color: #fca5a5; background: #fef2f2; }
.aitutor-q-head { font-weight: 600; padding: 0 4px; display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.aitutor-q-num { background: var(--ait-ink); color: #fff; border-radius: 6px; padding: 1px 7px; font-size: 12px; }
.aitutor-diff { font-size: 11px; border-radius: 999px; padding: 1px 8px; background: #f3f4f6; color: var(--ait-mut); }
.aitutor-diff.is-easy { background: #dcfce7; color: #166534; }
.aitutor-diff.is-medium { background: #fef3c7; color: #92400e; }
.aitutor-diff.is-hard { background: #fee2e2; color: #991b1b; }
.aitutor-opt { display: flex; gap: 8px; align-items: flex-start; padding: 7px 8px; border-radius: 6px; cursor: pointer; font-size: 14px; margin-top: 6px; }
.aitutor-opt:hover { background: #f8faff; }
.aitutor-opt-letter { font-weight: 700; color: var(--ait-primary); }
.aitutor-opt input.is-answer { outline: 2px solid var(--ait-ok); }
.aitutor-q-feedback { margin-top: 8px; font-size: 13px; border-top: 1px dashed var(--ait-line); padding-top: 8px; }
.aitutor-q-feedback p { margin: 4px 0 0; color: #374151; }
.aitutor-quiz-actions { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.aitutor-quiz-result { margin-top: 12px; border-radius: 8px; padding: 12px 14px; border: 1px solid var(--ait-line); }
.aitutor-quiz-result.is-pass { background: #f0fdf4; border-color: #86efac; }
.aitutor-quiz-result.is-fail { background: #fef2f2; border-color: #fca5a5; }
.aitutor-score { font-size: 1.15rem; font-weight: 700; }

/* Narration strip */
.aitutor-narration { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--ait-line); }
.aitutor-narration-status { font-size: 12px; color: var(--ait-mut); }

/* Chat */
.aitutor-chat { display: flex; flex-direction: column; }
.aitutor-messages { max-height: 46vh; overflow-y: auto; padding: 4px 2px 10px; display: flex; flex-direction: column; gap: 10px; }
.aitutor-msg { display: flex; }
.aitutor-msg.is-user { justify-content: flex-end; }
.aitutor-bubble { max-width: 85%; border: 1px solid var(--ait-line); border-radius: 12px; padding: 10px 14px; font-size: 14px; line-height: 1.55; background: #f9fafb; position: relative; }
.aitutor-msg.is-user .aitutor-bubble { background: var(--ait-primary); border-color: var(--ait-primary); color: #fff; }
.aitutor-bubble.is-thinking { color: var(--ait-mut); font-style: italic; }
.aitutor-bubble.is-error { background: #fef2f2; border-color: #fca5a5; color: #991b1b; }
.aitutor-bubble-prose { margin-top: 4px; color: #374151; }
.aitutor-bubble-quiz { margin-top: 6px; font-size: 12px; color: var(--ait-mut); }
.aitutor-play-msg { position: absolute; right: -10px; top: -10px; }
.aitutor-msg.is-user .aitutor-play-msg { display: none; }
.aitutor-form { display: flex; gap: 8px; align-items: flex-end; border-top: 1px solid var(--ait-line); padding-top: 10px; }
.aitutor-form textarea { flex: 1; border: 1px solid var(--ait-line); border-radius: 8px; padding: 10px 12px; font: inherit; font-size: 14px; resize: vertical; }
.aitutor-form textarea:focus { outline: 2px solid #bfdbfe; border-color: var(--ait-primary); }
.aitutor-notice { background: #fffbeb; border: 1px solid #fcd34d; border-radius: 8px; padding: 8px 12px; font-size: 14px; }

/* Toast */
.aitutor-toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(20px); background: #111827; color: #fff; padding: 10px 16px; border-radius: 8px; font-size: 14px; opacity: 0; pointer-events: none; transition: all .2s; z-index: 99999; max-width: 90vw; }
.aitutor-toast.is-visible { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Progress dashboard */
.aitutor-dash-title { margin: 0 0 14px; }
.aitutor-dash-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.aitutor-dash-card-title { margin: 0 0 8px; font-size: 1.1rem; }
.aitutor-dash-card-title a { text-decoration: none; color: inherit; }
.aitutor-dash-stat { margin: 6px 0; font-size: 14px; color: #374151; }
.aitutor-dash-card .aitutor-btn { margin-top: 8px; display: inline-block; text-decoration: none; }

/* Admin */
.aitutor-meta input, .aitutor-meta select { max-width: 100%; }
.aitutor-filters label { margin-right: 12px; }
.aitutor-filters input[type="number"] { width: 90px; }
.aitutor-attempt-detail { margin: 0; font-size: 12px; }
.aitutor-attempt-detail .is-wrong { color: #b91c1c; }
table.aitutor-meta th { width: 200px; }

/* Responsive */
@media (max-width: 860px) {
	.aitutor-grid { grid-template-columns: 1fr; }
	.aitutor-sidebar { position: static; max-height: none; }
	.aitutor-bubble { max-width: 95%; }
	.aitutor-form { flex-direction: column; align-items: stretch; }
}