/* Interactive Question Solver — Frontend Styles
 * All classes are prefixed .qsolver- to avoid theme conflicts.
 */

.qsolver-app {
	--qsolver-primary: #1e3a5f;
	--qsolver-secondary: #2563eb;
	--qsolver-btn-radius: 10px;
	--qsolver-panel-radius: 16px;
	--qsolver-font-size: 16px;
	--qsolver-workspace-height: 520px;
	--qsolver-border: #e6eaf0;
	--qsolver-muted: #64748b;
	--qsolver-bg: #eef1f5;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	font-size: var(--qsolver-font-size);
	color: #0f172a;
	line-height: 1.6;
	box-sizing: border-box;
	max-width: 1180px;
	margin: 0 auto;
}
.qsolver-app *,
.qsolver-app *::before,
.qsolver-app *::after { box-sizing: border-box; }

.qsolver-notice {
	background: #fff7ed;
	border: 1px solid #fed7aa;
	color: #9a3412;
	padding: 16px 20px;
	border-radius: 12px;
	margin: 16px 0;
}

/* Panels */
.qsolver-panels {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 24px;
	align-items: stretch;
}
.qsolver-panel {
	background: #fff;
	border: 1px solid var(--qsolver-border);
	border-radius: var(--qsolver-panel-radius);
	padding: 28px 30px;
	box-shadow: 0 8px 24px rgba(15, 23, 42, 0.05);
}

/* Left question panel */
.qsolver-meta-line { font-weight: 600; color: #1e293b; font-size: 1.05em; }
.qsolver-divider { border: none; border-top: 1px solid var(--qsolver-border); margin: 16px 0 20px; }
.qsolver-question-heading { margin: 0 0 12px; font-size: 1.25em; color: #0f172a; font-weight: 700; }
.qsolver-question-content { color: #1f2937; }
.qsolver-question-content p { margin: 0 0 10px; }
.qsolver-question-image { margin: 18px 0; }
.qsolver-question-image img { max-width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--qsolver-border); }

/* MCQ options */
.qsolver-mcq-options { margin-top: 22px; display: flex; flex-direction: column; gap: 12px; }
.qsolver-mcq-option {
	display: flex; align-items: center; gap: 12px;
	padding: 12px 16px; border: 1.5px solid var(--qsolver-border);
	border-radius: 12px; cursor: pointer;
	transition: border-color .18s ease, background-color .18s ease, box-shadow .18s ease;
}
.qsolver-mcq-option:hover { border-color: var(--qsolver-secondary); background: #f8fafc; }
.qsolver-mcq-option.is-selected { border-color: var(--qsolver-secondary); background: #eff6ff; box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.qsolver-mcq-radio { width: 18px; height: 18px; accent-color: var(--qsolver-secondary); }
.qsolver-mcq-letter { font-weight: 700; }

/* Workspace panel */
.qsolver-workspace-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.qsolver-workspace-title { font-size: 1.15em; font-weight: 700; }
.qsolver-autosave { font-size: .82em; color: var(--qsolver-muted); min-height: 18px; }
.qsolver-autosave.is-saved { color: #16a34a; }

.qsolver-mode { display: none; }
.qsolver-mode.is-active { display: block; }

/* Canvas */
.qsolver-canvas-toolbar {
	display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
	padding: 8px 10px; background: #f8fafc; border: 1px solid var(--qsolver-border);
	border-radius: 10px 10px 0 0; border-bottom: none;
}
.qsolver-tool {
	background: #fff; border: 1px solid var(--qsolver-border); border-radius: 8px;
	width: 34px; height: 34px; font-size: 16px; cursor: pointer; line-height: 1;
	display: inline-flex; align-items: center; justify-content: center;
	transition: background-color .15s ease, border-color .15s ease;
}
.qsolver-tool:hover { background: #eef2ff; }
.qsolver-tool.is-active { background: var(--qsolver-secondary); color: #fff; border-color: var(--qsolver-secondary); }
.qsolver-tool-sep { width: 1px; height: 24px; background: var(--qsolver-border); margin: 0 4px; }
.qsolver-stroke-label { font-size: .8em; color: var(--qsolver-muted); display: inline-flex; align-items: center; gap: 6px; }
.qsolver-stroke { width: 80px; accent-color: var(--qsolver-secondary); }
.qsolver-color-swatches { display: inline-flex; gap: 5px; margin-left: 4px; }
.qsolver-color { width: 22px; height: 22px; border-radius: 50%; border: 2px solid #fff; box-shadow: 0 0 0 1px var(--qsolver-border); cursor: pointer; }
.qsolver-color.is-active { box-shadow: 0 0 0 2px var(--qsolver-secondary); }

.qsolver-canvas-wrap {
	border: 1px solid var(--qsolver-border); border-radius: 0 0 10px 10px;
	overflow: hidden; height: var(--qsolver-workspace-height);
	position: relative; background: #fff;
}
.qsolver-bg-grid { background-image: linear-gradient(#eef2f7 1px, transparent 1px), linear-gradient(90deg, #eef2f7 1px, transparent 1px); background-size: 26px 26px; }
.qsolver-bg-dotted { background-image: radial-gradient(#d7dee7 1.3px, transparent 1.3px); background-size: 22px 22px; }
.qsolver-bg-plain { background: #fff; }
.qsolver-canvas { display: block; width: 100%; height: 100%; touch-action: none; cursor: crosshair; }

/* Upload */
.qsolver-upload-zone {
	border: 2px dashed #c7d2e0; border-radius: 12px; height: var(--qsolver-workspace-height);
	display: flex; align-items: center; justify-content: center; text-align: center; position: relative; background: #fbfcfe;
}
.qsolver-upload-zone.is-dragover { border-color: var(--qsolver-secondary); background: #eff6ff; }
.qsolver-file-input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.qsolver-upload-icon { font-size: 42px; color: var(--qsolver-secondary); }
.qsolver-upload-cta p { color: var(--qsolver-muted); margin: 10px 0; }
.qsolver-upload-cta small { color: #94a3b8; }
.qsolver-upload-preview { display: flex; flex-direction: column; align-items: center; gap: 10px; padding: 16px; }
.qsolver-upload-img { max-width: 90%; max-height: calc(var(--qsolver-workspace-height) - 120px); border-radius: 10px; border: 1px solid var(--qsolver-border); }

/* Typed */
.qsolver-typed {
	width: 100%; height: var(--qsolver-workspace-height); resize: vertical;
	border: 1px solid var(--qsolver-border); border-radius: 12px; padding: 16px 18px;
	font-size: 1em; font-family: inherit; line-height: 1.7;
}
.qsolver-typed:focus { outline: none; border-color: var(--qsolver-secondary); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }

/* Mode switch buttons */
.qsolver-mode-switch { display: flex; gap: 12px; margin-top: 16px; flex-wrap: wrap; }
.qsolver-ic { margin-right: 8px; }

/* Buttons */
.qsolver-btn-primary, .qsolver-btn-outline, .qsolver-btn-ghost, .qsolver-btn-submit {
	font-family: inherit; font-size: .95em; font-weight: 600; cursor: pointer;
	border-radius: var(--qsolver-btn-radius); padding: 12px 20px; border: 1.5px solid transparent;
	display: inline-flex; align-items: center; justify-content: center;
	transition: background-color .18s ease, color .18s ease, border-color .18s ease, transform .1s ease, box-shadow .18s ease;
}
.qsolver-btn-primary { background: var(--qsolver-secondary); color: #fff; }
.qsolver-btn-primary:hover { background: #1d4ed8; }
.qsolver-btn-outline { background: #fff; color: #334155; border-color: var(--qsolver-border); }
.qsolver-btn-outline:hover { border-color: var(--qsolver-secondary); color: var(--qsolver-secondary); }
.qsolver-btn-ghost { background: transparent; color: var(--qsolver-primary); border-color: transparent; }
.qsolver-btn-ghost:hover { background: #eef2ff; }
.qsolver-mode-btn.is-active { background: var(--qsolver-secondary); color: #fff; border-color: var(--qsolver-secondary); }
.qsolver-btn-outline:disabled { opacity: .5; cursor: not-allowed; }
button:active.qsolver-btn-primary, button:active.qsolver-btn-submit { transform: translateY(1px); }

/* Footer actions */
.qsolver-actions {
	display: flex; align-items: center; justify-content: space-between;
	gap: 16px; margin-top: 26px; flex-wrap: wrap;
}
.qsolver-action-right { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.qsolver-btn-submit {
	background: var(--qsolver-primary); color: #fff; font-size: 1.05em;
	padding: 15px 40px; box-shadow: 0 6px 18px rgba(30,58,95,.25);
}
.qsolver-btn-submit:hover { background: #16304f; }
.qsolver-btn-submit:disabled { opacity: .6; cursor: not-allowed; }

/* Status */
.qsolver-status-bar { margin-top: 18px; }
.qsolver-status-chip {
	display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px;
	border-radius: 999px; font-weight: 600; font-size: .9em;
}
.qsolver-status-correct { background: #dcfce7; color: #166534; }
.qsolver-status-incorrect { background: #fee2e2; color: #991b1b; }
.qsolver-status-needs_review, .qsolver-status-submitted { background: #e0e7ff; color: #3730a3; }
.qsolver-status-reviewed { background: #dbeafe; color: #1e40af; }

/* Answer reveal */
.qsolver-answer-reveal {
	margin-top: 20px; background: #f0f9ff; border: 1px solid #bae6fd;
	border-radius: 14px; padding: 22px 26px; animation: qsolver-fade .3s ease;
}
@keyframes qsolver-fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.qsolver-answer-head { font-weight: 700; color: #075985; margin-bottom: 10px; font-size: 1.05em; }
.qsolver-answer-correct { font-weight: 700; color: #0c4a6e; margin-bottom: 10px; }

/* Group header + progress */
.qsolver-group-header { margin-bottom: 22px; }
.qsolver-group-title-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.qsolver-group-title { margin: 0; font-size: 1.5em; font-weight: 800; color: var(--qsolver-primary); }
.qsolver-group-desc { color: var(--qsolver-muted); margin: 6px 0 0; }
.qsolver-badge { font-size: .72em; font-weight: 700; padding: 4px 10px; border-radius: 999px; letter-spacing: .04em; }
.qsolver-badge-active { background: #dcfce7; color: #166534; }
.qsolver-badge-inactive { background: #f1f5f9; color: #64748b; }

.qsolver-progress { margin-top: 16px; }
.qsolver-progress-text { font-weight: 600; margin-bottom: 8px; color: #334155; }
.qsolver-progress-bar { height: 8px; background: #e2e8f0; border-radius: 999px; overflow: hidden; }
.qsolver-progress-fill { display: block; height: 100%; background: var(--qsolver-secondary); transition: width .3s ease; }
.qsolver-progress-dots { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.qsolver-dot {
	width: 30px; height: 30px; border-radius: 8px; background: #f1f5f9; color: #64748b;
	display: inline-flex; align-items: center; justify-content: center; font-size: .82em; font-weight: 600;
	cursor: pointer; border: 1px solid var(--qsolver-border); transition: background-color .15s ease;
}
.qsolver-dot:hover { background: #e2e8f0; }
.qsolver-dot.is-current { background: var(--qsolver-secondary); color: #fff; border-color: var(--qsolver-secondary); }
.qsolver-dot.is-done { background: #dcfce7; color: #166534; border-color: #bbf7d0; }

/* Completion */
.qsolver-complete { margin-top: 24px; }
.qsolver-complete-card { background: #fff; border: 1px solid var(--qsolver-border); border-radius: var(--qsolver-panel-radius); padding: 40px; text-align: center; box-shadow: 0 8px 24px rgba(15,23,42,.06); }
.qsolver-complete-card h2 { margin-top: 0; color: var(--qsolver-primary); }
.qsolver-complete-stats { list-style: none; padding: 0; margin: 20px auto; max-width: 320px; text-align: left; }
.qsolver-complete-stats li { padding: 8px 0; border-bottom: 1px solid var(--qsolver-border); display: flex; justify-content: space-between; }

/* History + dashboard */
.qsolver-history-title, .qsolver-dash-subtitle { color: var(--qsolver-primary); }
.qsolver-history-list { display: flex; flex-direction: column; gap: 10px; margin-top: 12px; }
.qsolver-history-item {
	display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 12px; align-items: center;
	background: #fff; border: 1px solid var(--qsolver-border); border-radius: 12px; padding: 14px 18px;
}
.qsolver-history-q { font-weight: 600; }
.qsolver-history-date { color: var(--qsolver-muted); font-size: .88em; text-align: right; }
.qsolver-history-marks { margin-left: 8px; font-weight: 700; }

.qsolver-dash-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 16px; }
.qsolver-stat-card { background: #fff; border: 1px solid var(--qsolver-border); border-radius: 14px; padding: 22px; text-align: center; box-shadow: 0 4px 14px rgba(15,23,42,.04); }
.qsolver-stat-num { display: block; font-size: 2em; font-weight: 800; color: var(--qsolver-primary); }
.qsolver-stat-label { color: var(--qsolver-muted); font-size: .9em; }
.qsolver-stat-good .qsolver-stat-num { color: #16a34a; }
.qsolver-stat-bad .qsolver-stat-num { color: #dc2626; }
.qsolver-stat-warn .qsolver-stat-num { color: #d97706; }
.qsolver-stat-accent .qsolver-stat-num { color: var(--qsolver-secondary); }

/* Toast */
.qsolver-toast {
	position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(20px);
	background: #0f172a; color: #fff; padding: 14px 26px; border-radius: 12px; font-weight: 600;
	box-shadow: 0 10px 30px rgba(0,0,0,.25); opacity: 0; pointer-events: none;
	transition: opacity .25s ease, transform .25s ease; z-index: 99999;
}
.qsolver-toast.is-visible { opacity: 1; transform: translateX(-50%) translateY(0); }
.qsolver-toast.is-error { background: #b91c1c; }
.qsolver-toast.is-success { background: #15803d; }

/* Responsive */
@media (max-width: 900px) {
	.qsolver-panels { grid-template-columns: 1fr; }
	.qsolver-actions { flex-direction: column-reverse; align-items: stretch; }
	.qsolver-btn-submit { width: 100%; }
	.qsolver-action-right { justify-content: space-between; }
	.qsolver-history-item { grid-template-columns: 1fr; gap: 6px; }
	.qsolver-history-date { text-align: left; }
}