/* Quadratic Solver - Component Styles */

:root {
    --qs-tool: #7c3aed;
    --qs-tool-dark: #6d28d9;
    --qs-gradient: linear-gradient(135deg, #7c3aed 0%, #a78bfa 100%);
    --qs-light: #ede9fe;
}
[data-theme="dark"] {
    --qs-light: rgba(124, 58, 237, 0.15);
}

/* ===== Empty-state example chips (math-studio shell) ===== */
.qs-empty-chips {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.45rem 0.75rem;
    align-items: center;
    max-width: 420px;
    margin: 1rem auto 0;
    text-align: left;
}
.qs-empty-chips .qs-chip-label {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--ms-muted, #78716c);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.qs-empty-chips .ic-example-chip {
    justify-self: start;
    text-align: left;
    font-family: var(--ms-font-mono, JetBrains Mono, monospace);
    font-size: 0.85rem;
}
.qs-empty-hint {
    color: var(--ms-muted, #78716c);
    font-size: 0.8rem;
    margin: 1.25rem 0 0;
    text-align: center;
}

/* ===== Form Type Toggle ===== */
.qs-form-toggle {
    display: flex;
    border: 1.5px solid var(--border);
    border-radius: 0.5rem;
    overflow: hidden;
    margin-bottom: 1rem;
}
.qs-form-btn {
    flex: 1;
    padding: 0.5rem;
    font-weight: 600;
    font-size: 0.7rem;
    border: none;
    cursor: pointer;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    transition: all 0.15s;
    font-family: var(--font-sans);
    text-align: center;
}
.qs-form-btn.active {
    background: var(--qs-gradient);
    color: #fff;
}
.qs-form-btn:hover:not(.active) {
    background: var(--bg-tertiary);
}
[data-theme="dark"] .qs-form-btn { background: var(--bg-tertiary); }
[data-theme="dark"] .qs-form-btn.active { background: var(--qs-gradient); color: #fff; }

/* ===== Coefficient Inputs ===== */
.qs-coeff-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 0.5rem;
}
.qs-coeff-group {
    flex: 1;
    text-align: center;
}
.qs-coeff-label {
    display: block;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--qs-tool);
    font-family: var(--font-mono);
    margin-bottom: 0.25rem;
}
.qs-coeff-input {
    width: 100%;
    padding: 0.4rem 0.5rem;
    text-align: center;
    border: 1.5px solid var(--border);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: var(--font-mono);
    background: var(--bg-primary);
    color: var(--text-primary);
}
.qs-coeff-input:focus {
    outline: none;
    border-color: var(--qs-tool);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}
[data-theme="dark"] .qs-coeff-input {
    background: var(--bg-tertiary);
    border-color: var(--border);
}

/* ===== Method Selector ===== */
.qs-method-select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1.5px solid var(--border);
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
}
[data-theme="dark"] .qs-method-select {
    background: var(--bg-tertiary);
    border-color: var(--border);
}

/* ===== Live Preview ===== */
.qs-preview {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: auto;
    font-size: 1.1rem;
}
.qs-preview .katex-display { margin: 0; }
[data-theme="dark"] .qs-preview { background: var(--bg-tertiary); }

/* ===== Output Tabs ===== */
.qs-output-tabs {
    display: flex;
    border: 1.5px solid var(--border);
    border-radius: 0.5rem;
    overflow: hidden;
}
.qs-output-tab {
    flex: 1;
    padding: 0.5rem;
    font-weight: 600;
    font-size: 0.8125rem;
    border: none;
    cursor: pointer;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    transition: all 0.15s;
    font-family: var(--font-sans);
    text-align: center;
}
.qs-output-tab.active {
    background: var(--qs-gradient);
    color: #fff;
}
.qs-output-tab:hover:not(.active) {
    background: var(--bg-tertiary);
}
[data-theme="dark"] .qs-output-tab { background: var(--bg-tertiary); }
[data-theme="dark"] .qs-output-tab.active { background: var(--qs-gradient); color: #fff; }

.qs-panel { display: none; flex: 1; min-height: 0; }
.qs-panel.active { display: flex; flex-direction: column; }
#qs-panel-result .tool-result-card { flex: 1; }
#qs-panel-graph { min-height: 480px; }
#qs-panel-python { min-height: 540px; }

/* ===== Result Display ===== */
.qs-result-section {
    padding: 1.25rem;
}
.qs-result-badge {
    display: inline-block;
    padding: 0.3rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
}
.qs-badge-success { background: #dcfce7; color: #166534; }
.qs-badge-warning { background: #fef3c7; color: #92400e; }
.qs-badge-info { background: var(--qs-light); color: var(--qs-tool); }
[data-theme="dark"] .qs-badge-success { background: rgba(16, 185, 129, 0.2); color: #6ee7b7; }
[data-theme="dark"] .qs-badge-warning { background: rgba(245, 158, 11, 0.2); color: #fbbf24; }

.qs-result-label {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}
.qs-result-math {
    max-width: 100%;
    padding: 0.75rem 0;
    text-align: center;
    overflow-x: auto;
}
.qs-result-math .katex-display { margin: 0; overflow-x: auto; overflow-y: hidden; }
.qs-result-detail {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    margin-top: 0.75rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}
[data-theme="dark"] .qs-result-detail {
    background: var(--bg-tertiary);
}
.qs-area-box {
    border-left: 4px solid var(--qs-tool) !important;
}
.qs-area-value { font-weight: 700; color: var(--qs-tool); font-family: var(--font-mono, 'JetBrains Mono', monospace); }
.qs-area-hint { font-size: 0.75rem; color: var(--text-muted); }
.qs-method-badge {
    display: inline-block;
    background: var(--qs-light);
    color: var(--qs-tool);
    padding: 0.2rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.6875rem;
    font-weight: 600;
}
.qs-error {
    background: #fef3c7;
    border: 1px solid #fbbf24;
    border-radius: 0.5rem;
    padding: 1.25rem;
    color: #92400e;
}
.qs-error h4 { margin: 0 0 0.5rem; font-size: 0.9375rem; }
.qs-error p { margin: 0; font-size: 0.8125rem; }
[data-theme="dark"] .qs-error {
    background: rgba(251, 191, 36, 0.15);
    border-color: rgba(251, 191, 36, 0.3);
    color: #fbbf24;
}

/* ===== Steps ===== */
.qs-steps-wrapper {
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
}
.qs-steps-header {
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
[data-theme="dark"] .qs-steps-header {
    background: var(--bg-tertiary);
}
.qs-step {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    align-items: flex-start;
}
.qs-step:last-child { border-bottom: none; }
.qs-step-number {
    min-width: 24px;
    height: 24px;
    background: var(--qs-tool);
    color: #fff;
    border-radius: 50%;
    font-size: 0.6875rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}
.qs-step-content {
    flex: 1;
    min-width: 0;
}
.qs-step-desc {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
    line-height: 1.5;
}
.qs-step-math {
    overflow-x: auto;
    padding: 0.25rem 0;
}
.qs-step-math .katex-display { margin: 0; overflow-x: auto; overflow-y: hidden; }

/* ===== Example Chips ===== */
.qs-examples {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}
.qs-example-chip {
    padding: 0.3rem 0.625rem;
    font-size: 0.6875rem;
    font-family: var(--font-sans);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 9999px;
    cursor: pointer;
    transition: all 0.15s;
    color: var(--text-secondary);
    white-space: nowrap;
    font-weight: 500;
}
.qs-example-chip:hover {
    background: var(--qs-tool);
    color: #fff;
    border-color: var(--qs-tool);
}
[data-theme="dark"] .qs-example-chip {
    background: var(--bg-tertiary);
}

/* ===== Graph ===== */
#qs-graph-container {
    width: 100%;
    min-height: 440px;
    border-radius: var(--radius-md);
}
.js-plotly-plot .plotly .modebar { top: 4px !important; right: 4px !important; }

/* ===== Educational Content ===== */
.qs-edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}
.qs-edu-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1.25rem;
}
.qs-edu-card h4 {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}
.qs-edu-card p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}
[data-theme="dark"] .qs-edu-card {
    background: var(--bg-tertiary);
}

/* ===== Methods Table ===== */
.qs-methods-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
    margin-top: 0.75rem;
}
.qs-methods-table th, .qs-methods-table td {
    padding: 0.5rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.qs-methods-table th {
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-secondary);
}
.qs-methods-table td {
    color: var(--text-secondary);
}
[data-theme="dark"] .qs-methods-table th {
    background: var(--bg-tertiary);
}

/* ===== FAQ ===== */
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item:last-child { border-bottom: none; }
.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.875rem 0;
    background: none;
    border: none;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    text-align: left;
    font-family: var(--font-sans);
    gap: 0.75rem;
}
.faq-answer {
    display: none;
    padding: 0 0 0.875rem;
    font-size: 0.8125rem;
    line-height: 1.7;
    color: var(--text-secondary);
}
.faq-item.open .faq-answer { display: block; }
.faq-chevron { transition: transform 0.2s; flex-shrink: 0; }
.faq-item.open .faq-chevron { transform: rotate(180deg); }

/* ===== Educational Animations ===== */
@keyframes qs-fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.qs-anim { opacity: 0; }
.qs-anim.qs-visible { animation: qs-fadeInUp 0.5s ease-out forwards; }
.qs-anim.qs-visible.qs-anim-d1 { animation-delay: 0.1s; }
.qs-anim.qs-visible.qs-anim-d2 { animation-delay: 0.2s; }
.qs-anim.qs-visible.qs-anim-d3 { animation-delay: 0.3s; }
.qs-anim.qs-visible.qs-anim-d4 { animation-delay: 0.4s; }
.qs-anim.qs-visible.qs-anim-d5 { animation-delay: 0.5s; }
.qs-anim.qs-visible.qs-anim-d6 { animation-delay: 0.6s; }

@media (prefers-reduced-motion: reduce) {
    .qs-anim { opacity: 1; animation: none !important; }
    .qs-disc-draw { stroke-dasharray: none; stroke-dashoffset: 0; animation: none !important; }
}

/* ===== Discriminant Cards ===== */
.qs-disc-viz {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin: 1.5rem 0;
}
@media (max-width: 600px) {
    .qs-disc-viz { grid-template-columns: 1fr; max-width: 280px; margin-left: auto; margin-right: auto; }
}

.qs-disc-card {
    border: 1.5px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}
.qs-disc-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.08);
}
[data-theme="dark"] .qs-disc-card:hover {
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.qs-disc-canvas {
    width: 100%;
    aspect-ratio: 1;
    background: var(--bg-secondary);
    display: block;
    position: relative;
    overflow: hidden;
}
[data-theme="dark"] .qs-disc-canvas { background: var(--bg-tertiary); }

.qs-disc-info {
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border);
}
.qs-disc-title {
    font-weight: 700;
    font-size: 0.8125rem;
    color: var(--text-primary);
    margin-bottom: 0.125rem;
}
.qs-disc-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* SVG parabola draw animation */
.qs-disc-draw {
    stroke-dasharray: 400;
    stroke-dashoffset: 400;
}
.qs-visible .qs-disc-draw {
    animation: qs-drawParabola 1.2s ease-out forwards;
}
@keyframes qs-drawParabola {
    to { stroke-dashoffset: 0; }
}

/* ===== Concept Hero: ax^2+bx+c ===== */
.qs-concept-hero {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 2rem 1rem;
    margin: 1.5rem 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    flex-wrap: wrap;
}
[data-theme="dark"] .qs-concept-hero { background: var(--bg-tertiary); }

.qs-concept-block {
    text-align: center;
    animation: qs-fadeInUp 0.6s ease-out both;
}
.qs-concept-block:nth-child(1) { animation-delay: 0.1s; }
.qs-concept-block:nth-child(2) { animation-delay: 0.2s; }
.qs-concept-block:nth-child(3) { animation-delay: 0.3s; }
.qs-concept-block:nth-child(4) { animation-delay: 0.4s; }
.qs-concept-block:nth-child(5) { animation-delay: 0.5s; }

.qs-concept-symbol {
    font-family: var(--font-mono);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}
.qs-concept-label {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 0.375rem;
    color: var(--text-muted);
}
.qs-c-a { color: var(--qs-tool); }
.qs-c-b { color: #10b981; }
.qs-c-c { color: #f59e0b; }
.qs-c-eq { color: var(--text-muted); }

/* ===== Callouts ===== */
.qs-callout {
    display: flex;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    border-radius: 0.625rem;
    margin: 1rem 0;
    align-items: flex-start;
}
.qs-callout-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
    margin-top: 0.125rem;
}
.qs-callout-text {
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--text-secondary);
}
.qs-callout-text strong { color: var(--text-primary); }

.qs-callout-insight {
    background: var(--qs-light);
    border: 1px solid rgba(124, 58, 237, 0.2);
}
.qs-callout-tip {
    background: #dcfce7;
    border: 1px solid rgba(16, 185, 129, 0.2);
}
[data-theme="dark"] .qs-callout-tip {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
}

/* ===== Real-World Example ===== */
.qs-real-world {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
    margin: 1.25rem 0;
}
[data-theme="dark"] .qs-real-world { background: var(--bg-tertiary); }

.qs-rw-header {
    padding: 0.75rem 1rem;
    background: var(--qs-light);
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--qs-tool);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.qs-rw-body {
    padding: 1rem 1.25rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    align-items: start;
}
@media (max-width: 600px) {
    .qs-rw-body { grid-template-columns: 1fr; }
}
.qs-rw-body p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* ===== Print Worksheet ===== */
@media print {
    body > *:not(#qsPrintArea) { display: none !important; }
    #qsPrintArea {
        display: block !important;
        position: static !important;
        width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
        background: #fff !important;
        color: #000 !important;
    }
}
.qs-print-root {
    position: absolute; left: -9999px; top: 0;
    width: 700px; padding: 30px;
    font-family: Inter, sans-serif; font-size: 11px;
    background: #fff; color: #0f172a;
}
.qs-print-wrapper { max-width: 100%; }
.qs-print-title { text-align: center; font-size: 1.25rem; font-weight: 700; margin-bottom: 0.25rem; }
.qs-print-info { text-align: center; color: #333; font-size: 0.8rem; margin-bottom: 0.75rem; }
.qs-print-problems { font-size: 0.85rem; }
.qs-print-section { font-weight: 700; font-size: 0.9rem; margin: 0.5rem 0 0.25rem; padding-bottom: 0.15rem; border-bottom: 1px solid #333; }
.qs-print-item { display: flex; align-items: baseline; gap: 0.35rem; margin-bottom: 0.4rem; }
.qs-print-num { font-weight: 600; min-width: 1.2rem; }
.qs-print-eq { font-family: 'JetBrains Mono', monospace; font-weight: 500; font-size: 0.85rem; }
.qs-print-blank { flex: 1; border-bottom: 1px solid #333; margin-left: 0.25rem; min-width: 40px; }
.qs-print-answer-key {
    margin-top: 1.5rem; padding-top: 1rem; border-top: 2px solid #333;
    page-break-before: always;
}
.qs-print-answer-title { font-weight: 700; font-size: 1rem; margin-bottom: 0.5rem; }
.qs-print-answer-row { font-size: 0.75rem; margin-bottom: 0.2rem; }
.qs-print-footer { text-align: center; color: #666; font-size: 0.7rem; margin-top: 1rem; }

/* ===== Responsive ===== */
@media (max-width: 767px) {
    .qs-coeff-input { font-size: 0.8125rem; }
    .qs-concept-symbol { font-size: 1.25rem; }
    .qs-concept-hero { padding: 1.25rem 0.75rem; gap: 0.5rem; }
    .qs-form-btn { font-size: 0.625rem; padding: 0.4rem 0.25rem; }
}