/* =========================================
   QUADRATIC EQUATION SOLVER CSS
   ========================================= */

:root {
    --quad-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --quad-gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --quad-gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --quad-gradient-green: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --quad-bg-dark: #0f172a;
    --quad-bg-card: #1e293b;
    --quad-bg-input: #0f172a;
    --quad-border: #334155;
    --quad-border-light: #475569;
    --quad-white: #ffffff;
    --quad-gray: #cbd5e1;
    --quad-muted: #94a3b8;
    --quad-success: #22c55e;
    --quad-warning: #eab308;
    --quad-danger: #ef4444;
    --quad-purple: #a855f7;
    --quad-pink: #ec4899;
    --quad-cyan: #06b6d4;
}

.quadratic-calc-wrapper {
    background: linear-gradient(to bottom, var(--quad-bg-dark), var(--quad-bg-card));
    padding: 3rem 1.5rem;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--quad-white);
    line-height: 1.6;
    min-height: 100vh;
}

.quadratic-calc-wrapper * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.quadratic-calc-container {
    max-width: 1000px;
    margin: 0 auto;
}

/* Header */
.quadratic-calc-wrapper .calc-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.quadratic-calc-wrapper .calc-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--quad-white);
    margin-bottom: 1rem;
    background: var(--quad-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.quadratic-calc-wrapper .calc-description {
    font-size: 1.1rem;
    color: var(--quad-gray);
    max-width: 700px;
    margin: 0 auto;
}

/* Card */
.quadratic-calc-wrapper .calc-card {
    background: var(--quad-bg-card);
    border: 1px solid var(--quad-border);
    border-radius: 1.5rem;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

/* Equation Display */
.quadratic-calc-wrapper .equation-display {
    background: var(--quad-gradient);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    margin-bottom: 2rem;
}

.quadratic-calc-wrapper .equation-formula {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--quad-white);
    font-family: 'Georgia', serif;
}

.quadratic-calc-wrapper .equation-formula .coef-a,
.quadratic-calc-wrapper .equation-formula .coef-b,
.quadratic-calc-wrapper .equation-formula .coef-c {
    color: #ffd700;
    font-weight: 800;
}

/* Form */
.quadratic-calc-wrapper .quadratic-form {
    margin-bottom: 2rem;
}

.quadratic-calc-wrapper .form-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.quadratic-calc-wrapper .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.quadratic-calc-wrapper .form-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--quad-gray);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quadratic-calc-wrapper .form-label i {
    color: var(--quad-purple);
}

.quadratic-calc-wrapper .input-wrapper {
    position: relative;
}

.quadratic-calc-wrapper .form-input {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 2px solid var(--quad-border-light);
    border-radius: 0.75rem;
    background: var(--quad-bg-input);
    color: var(--quad-white);
    font-size: 1.25rem;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
}

.quadratic-calc-wrapper .form-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.15);
}

.quadratic-calc-wrapper .input-note {
    position: absolute;
    bottom: -1.5rem;
    left: 0;
    font-size: 0.75rem;
    color: var(--quad-muted);
    font-style: italic;
}

/* Buttons */
.quadratic-calc-wrapper .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.25rem 2.5rem;
    border: none;
    border-radius: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.quadratic-calc-wrapper .btn-primary {
    background: var(--quad-gradient);
    color: var(--quad-white);
    box-shadow: 0 10px 30px rgba(102,126,234,0.3);
}

.quadratic-calc-wrapper .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(102,126,234,0.5);
}

.quadratic-calc-wrapper .btn-secondary {
    background: var(--quad-border);
    color: var(--quad-white);
}

.quadratic-calc-wrapper .btn-secondary:hover {
    background: var(--quad-border-light);
}

.quadratic-calc-wrapper .controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.quadratic-calc-wrapper .controls .btn {
    flex: 1;
    min-width: 200px;
}

/* Error Box */
.quadratic-calc-wrapper .error-box {
    display: none;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.5);
    border-radius: 0.75rem;
    color: #f87171;
    margin-bottom: 1.5rem;
}

.quadratic-calc-wrapper .error-box.show {
    display: flex;
}

/* Result Section */
.quadratic-calc-wrapper .result-section {
    display: none;
    margin-top: 2.5rem;
    padding-top: 2.5rem;
    border-top: 2px solid var(--quad-border);
}

.quadratic-calc-wrapper .result-section.show {
    display: block;
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Section Title */
.quadratic-calc-wrapper .section-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--quad-white);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.quadratic-calc-wrapper .section-title i {
    color: var(--quad-purple);
}

/* Current Equation */
.quadratic-calc-wrapper .current-equation {
    margin-bottom: 2rem;
}

.quadratic-calc-wrapper .equation-box {
    background: var(--quad-bg-input);
    border: 2px solid var(--quad-purple);
    border-radius: 1rem;
    padding: 1.5rem;
    text-align: center;
}

.quadratic-calc-wrapper .equation-text {
    font-size: 2rem;
    font-weight: 700;
    color: var(--quad-white);
    font-family: 'Georgia', serif;
}

/* Solutions Display */
.quadratic-calc-wrapper .solutions-display {
    margin-bottom: 2rem;
}

.quadratic-calc-wrapper .solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.quadratic-calc-wrapper .solution-box {
    background: var(--quad-gradient);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
}

.quadratic-calc-wrapper .solution-label {
    font-size: 1.25rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 1rem;
}

.quadratic-calc-wrapper .solution-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--quad-white);
}

.quadratic-calc-wrapper .discriminant-info {
    background: var(--quad-bg-input);
    border: 1px solid var(--quad-border);
    border-radius: 0.75rem;
    padding: 1.25rem;
    text-align: center;
    font-size: 1.1rem;
}

.quadratic-calc-wrapper .discriminant-label {
    color: var(--quad-gray);
    margin-right: 0.75rem;
}

.quadratic-calc-wrapper .discriminant-value {
    font-weight: 700;
    color: var(--quad-white);
}

/* Step Solution */
.quadratic-calc-wrapper .step-solution {
    margin-bottom: 2rem;
}

.quadratic-calc-wrapper .steps-container {
    background: var(--quad-bg-input);
    border: 1px solid var(--quad-border);
    border-radius: 1rem;
    padding: 2rem;
}

.quadratic-calc-wrapper .step-item-calc {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    margin-bottom: 1rem;
    background: var(--quad-bg-card);
    border-radius: 0.75rem;
    border-left: 4px solid var(--quad-purple);
}

.quadratic-calc-wrapper .step-item-calc:last-child {
    margin-bottom: 0;
}

.quadratic-calc-wrapper .step-number-calc {
    width: 40px;
    height: 40px;
    min-width: 40px;
    background: var(--quad-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--quad-white);
    font-size: 1.1rem;
}

.quadratic-calc-wrapper .step-content-calc {
    flex: 1;
}

.quadratic-calc-wrapper .step-content-calc h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--quad-white);
    margin-bottom: 0.5rem;
}

.quadratic-calc-wrapper .step-content-calc p {
    font-size: 0.95rem;
    color: var(--quad-gray);
    margin-bottom: 0.5rem;
}

.quadratic-calc-wrapper .step-formula {
    background: rgba(102,126,234,0.1);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-family: 'Georgia', serif;
    color: var(--quad-white);
    font-size: 1.1rem;
    margin-top: 0.5rem;
}

/* Graph Container */
.quadratic-calc-wrapper .graph-container {
    margin-bottom: 2rem;
    background: var(--quad-bg-input);
    border: 1px solid var(--quad-border);
    border-radius: 1rem;
    padding: 2rem;
}

.quadratic-calc-wrapper #parabolaChart {
    max-width: 100%;
    max-height: 500px;
    margin: 0 auto 1.5rem;
}

.quadratic-calc-wrapper .graph-legend {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.quadratic-calc-wrapper .legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    color: var(--quad-gray);
}

.quadratic-calc-wrapper .legend-color {
    width: 20px;
    height: 20px;
    border-radius: 0.25rem;
}

/* Properties Section */
.quadratic-calc-wrapper .properties-section {
    margin-bottom: 2rem;
}

.quadratic-calc-wrapper .properties-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

.quadratic-calc-wrapper .property-box {
    background: var(--quad-bg-input);
    border: 1px solid var(--quad-border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.quadratic-calc-wrapper .property-box:hover {
    border-color: var(--quad-purple);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(168,85,247,0.2);
}

.quadratic-calc-wrapper .property-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 1rem;
    background: var(--quad-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--quad-white);
}

.quadratic-calc-wrapper .property-label {
    font-size: 0.85rem;
    color: var(--quad-muted);
    margin-bottom: 0.5rem;
}

.quadratic-calc-wrapper .property-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--quad-white);
}

/* Solution Type Info */
.quadratic-calc-wrapper .solution-type-info {
    margin-bottom: 2rem;
}

.quadratic-calc-wrapper .info-box {
    background: var(--quad-bg-input);
    border: 1px solid var(--quad-border);
    border-radius: 1rem;
    padding: 2rem;
}

.quadratic-calc-wrapper .solution-explanation p {
    color: var(--quad-gray);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.quadratic-calc-wrapper .solution-explanation p:last-child {
    margin-bottom: 0;
}

.quadratic-calc-wrapper .solution-explanation strong {
    color: var(--quad-white);
}

/* Info Cards */
.quadratic-calc-wrapper .info-card {
    background: var(--quad-bg-card);
    border: 1px solid var(--quad-border);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.quadratic-calc-wrapper .info-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--quad-white);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.quadratic-calc-wrapper .info-title i {
    color: var(--quad-purple);
}

.quadratic-calc-wrapper .info-card p {
    color: var(--quad-gray);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.quadratic-calc-wrapper .info-list {
    list-style: none;
    padding: 0;
}

.quadratic-calc-wrapper .info-list li {
    color: var(--quad-gray);
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.quadratic-calc-wrapper .info-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--quad-purple);
    font-weight: 700;
}

.quadratic-calc-wrapper .formula-box {
    background: var(--quad-gradient);
    border-radius: 0.75rem;
    padding: 1.5rem;
    text-align: center;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--quad-white);
    font-family: 'Georgia', serif;
    margin: 1.5rem 0;
}

/* Discriminant Types */
.quadratic-calc-wrapper .discriminant-types {
    display: grid;
    gap: 1.5rem;
}

.quadratic-calc-wrapper .disc-type {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--quad-bg-input);
    border: 1px solid var(--quad-border);
    border-radius: 0.75rem;
}

.quadratic-calc-wrapper .disc-icon {
    width: 64px;
    height: 64px;
    min-width: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--quad-white);
}

.quadratic-calc-wrapper .disc-icon.positive {
    background: var(--quad-gradient-green);
}

.quadratic-calc-wrapper .disc-icon.zero {
    background: var(--quad-gradient-3);
}

.quadratic-calc-wrapper .disc-icon.negative {
    background: var(--quad-gradient-2);
}

.quadratic-calc-wrapper .disc-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--quad-white);
    margin-bottom: 0.5rem;
}

.quadratic-calc-wrapper .disc-content p {
    color: var(--quad-gray);
    font-size: 0.95rem;
    margin: 0;
}

/* Steps Grid */
.quadratic-calc-wrapper .steps-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.quadratic-calc-wrapper .step-item {
    display: flex;
    gap: 1rem;
}

.quadratic-calc-wrapper .step-number {
    width: 40px;
    height: 40px;
    min-width: 40px;
    background: var(--quad-gradient);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--quad-white);
}

.quadratic-calc-wrapper .step-content h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--quad-white);
    margin-bottom: 0.25rem;
}

.quadratic-calc-wrapper .step-content p {
    font-size: 0.9rem;
    color: var(--quad-muted);
    margin: 0;
}

/* Examples Grid */
.quadratic-calc-wrapper .examples-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.quadratic-calc-wrapper .example-box {
    background: var(--quad-bg-input);
    border: 1px solid var(--quad-border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.quadratic-calc-wrapper .example-box:hover {
    border-color: var(--quad-purple);
    transform: translateY(-5px);
}

.quadratic-calc-wrapper .example-equation {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--quad-white);
    margin-bottom: 0.75rem;
    font-family: 'Georgia', serif;
}

.quadratic-calc-wrapper .example-desc {
    font-size: 0.9rem;
    color: var(--quad-muted);
    margin-bottom: 1rem;
}

.quadratic-calc-wrapper .btn-example {
    padding: 0.75rem 1.5rem;
    background: var(--quad-gradient);
    color: var(--quad-white);
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.quadratic-calc-wrapper .btn-example:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(102,126,234,0.4);
}

/* Responsive */
@media (max-width: 1024px) {
    .quadratic-calc-wrapper .properties-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .quadratic-calc-wrapper {
        padding: 2rem 1rem;
    }
    
    .quadratic-calc-wrapper .calc-title {
        font-size: 2rem;
    }
    
    .quadratic-calc-wrapper .calc-card {
        padding: 1.5rem;
    }
    
    .quadratic-calc-wrapper .form-row {
        grid-template-columns: 1fr;
    }
    
    .quadratic-calc-wrapper .controls {
        flex-direction: column;
    }
    
    .quadratic-calc-wrapper .controls .btn {
        width: 100%;
    }
    
    .quadratic-calc-wrapper .solutions-grid {
        grid-template-columns: 1fr;
    }
    
    .quadratic-calc-wrapper .properties-grid {
        grid-template-columns: 1fr;
    }
    
    .quadratic-calc-wrapper .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .quadratic-calc-wrapper .examples-grid {
        grid-template-columns: 1fr;
    }
    
    .quadratic-calc-wrapper .equation-formula {
        font-size: 1.75rem;
    }
    
    .quadratic-calc-wrapper .equation-text {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .quadratic-calc-wrapper .calc-title {
        font-size: 1.75rem;
    }
    
    .quadratic-calc-wrapper .solution-value {
        font-size: 1.5rem;
    }
    
    .quadratic-calc-wrapper .form-input {
        font-size: 1rem;
    }
}