/* =========================================
   PERCENTAGE CALCULATOR CSS
   ========================================= */

:root {
    --pct-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --pct-gradient-2: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --pct-gradient-3: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --pct-gradient-4: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --pct-bg-dark: #0f172a;
    --pct-bg-card: #1e293b;
    --pct-bg-input: #0f172a;
    --pct-border: #334155;
    --pct-border-light: #475569;
    --pct-white: #ffffff;
    --pct-gray: #cbd5e1;
    --pct-muted: #94a3b8;
    --pct-success: #22c55e;
    --pct-warning: #eab308;
    --pct-danger: #ef4444;
    --pct-purple: #a855f7;
    --pct-blue: #3b82f6;
    --pct-cyan: #06b6d4;
    --pct-orange: #f97316;
    --pct-pink: #ec4899;
}

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

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

.percent-calc-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Header */
.percent-calc-wrapper .calc-header {
    text-align: center;
    margin-bottom: 3rem;
}

.percent-calc-wrapper .calc-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--pct-white);
    margin-bottom: 1rem;
}

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

/* Calculators Grid */
.percent-calc-wrapper .calculators-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

/* Calculator Card */
.percent-calc-wrapper .calc-card {
    background: var(--pct-bg-card);
    border: 1px solid var(--pct-border);
    border-radius: 1.25rem;
    overflow: hidden;
    transition: all 0.3s ease;
}

.percent-calc-wrapper .calc-card:hover {
    border-color: var(--pct-purple);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.percent-calc-wrapper .card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: var(--pct-bg-input);
    border-bottom: 1px solid var(--pct-border);
}

.percent-calc-wrapper .card-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: var(--pct-gradient);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--pct-white);
}

.percent-calc-wrapper .card-icon.increase {
    background: var(--pct-gradient-2);
}

.percent-calc-wrapper .card-icon.decrease {
    background: var(--pct-gradient-3);
}

.percent-calc-wrapper .card-icon.change {
    background: var(--pct-gradient-4);
}

.percent-calc-wrapper .card-icon.diff {
    background: linear-gradient(135deg, var(--pct-orange) 0%, var(--pct-pink) 100%);
}

.percent-calc-wrapper .card-icon.fraction {
    background: linear-gradient(135deg, var(--pct-cyan) 0%, var(--pct-blue) 100%);
}

.percent-calc-wrapper .card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--pct-white);
}

.percent-calc-wrapper .card-body {
    padding: 1.5rem;
}

/* Inline Form */
.percent-calc-wrapper .calc-form {
    margin-bottom: 1.25rem;
}

.percent-calc-wrapper .inline-form {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.percent-calc-wrapper .form-text {
    font-size: 1rem;
    color: var(--pct-gray);
    white-space: nowrap;
}

.percent-calc-wrapper .form-input {
    padding: 0.75rem 1rem;
    border: 1px solid var(--pct-border-light);
    border-radius: 0.5rem;
    background: var(--pct-bg-input);
    color: var(--pct-white);
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    text-align: center;
}

.percent-calc-wrapper .form-input.small {
    width: 100px;
}

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

.percent-calc-wrapper .form-input::placeholder {
    color: var(--pct-muted);
}

/* Buttons */
.percent-calc-wrapper .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.percent-calc-wrapper .btn-primary {
    background: var(--pct-gradient);
    color: var(--pct-white);
}

.percent-calc-wrapper .btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102,126,234,0.4);
}

/* Result Box */
.percent-calc-wrapper .result-box {
    display: none;
    margin-top: 1.25rem;
    padding: 1.25rem;
    background: var(--pct-bg-input);
    border-radius: 0.75rem;
    text-align: center;
    border: 1px solid var(--pct-border);
}

.percent-calc-wrapper .result-box.show {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.percent-calc-wrapper .result-label {
    font-size: 0.8rem;
    color: var(--pct-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.percent-calc-wrapper .result-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--pct-white);
    margin-bottom: 0.5rem;
}

.percent-calc-wrapper .result-value.positive {
    color: var(--pct-success);
}

.percent-calc-wrapper .result-value.negative {
    color: var(--pct-danger);
}

.percent-calc-wrapper .result-formula {
    font-size: 0.85rem;
    color: var(--pct-muted);
    font-family: 'Courier New', monospace;
}

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

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

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

/* Reference Grid */
.percent-calc-wrapper .reference-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.percent-calc-wrapper .reference-table h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--pct-white);
    margin-bottom: 1rem;
}

.percent-calc-wrapper .reference-table table {
    width: 100%;
    border-collapse: collapse;
}

.percent-calc-wrapper .reference-table th,
.percent-calc-wrapper .reference-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--pct-border);
}

.percent-calc-wrapper .reference-table th {
    background: var(--pct-bg-input);
    color: var(--pct-gray);
    font-weight: 600;
    font-size: 0.85rem;
}

.percent-calc-wrapper .reference-table td {
    color: var(--pct-white);
    font-size: 0.95rem;
}

.percent-calc-wrapper .reference-table tbody tr:hover {
    background: rgba(255,255,255,0.02);
}

/* Formulas Grid */
.percent-calc-wrapper .formulas-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.percent-calc-wrapper .formula-box {
    padding: 1.5rem;
    background: var(--pct-bg-input);
    border: 1px solid var(--pct-border);
    border-radius: 1rem;
}

.percent-calc-wrapper .formula-box h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--pct-white);
    margin-bottom: 0.75rem;
}

.percent-calc-wrapper .formula-box .formula {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--pct-cyan);
    background: var(--pct-bg-card);
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    margin-bottom: 0.75rem;
}

.percent-calc-wrapper .formula-box p {
    font-size: 0.85rem;
    color: var(--pct-muted);
    line-height: 1.5;
}

/* Steps Grid */
.percent-calc-wrapper .steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.percent-calc-wrapper .step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1rem;
}

.percent-calc-wrapper .step-number {
    width: 50px;
    height: 50px;
    background: var(--pct-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--pct-white);
}

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

.percent-calc-wrapper .step-content p {
    font-size: 0.85rem;
    color: var(--pct-muted);
}

/* Examples Grid */
.percent-calc-wrapper .examples-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.percent-calc-wrapper .example-box {
    padding: 1.5rem;
    background: var(--pct-bg-input);
    border: 1px solid var(--pct-border);
    border-radius: 1rem;
    transition: all 0.3s ease;
}

.percent-calc-wrapper .example-box:hover {
    border-color: var(--pct-purple);
    transform: translateY(-4px);
}

.percent-calc-wrapper .example-icon {
    width: 48px;
    height: 48px;
    background: var(--pct-gradient);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--pct-white);
    margin-bottom: 1rem;
}

.percent-calc-wrapper .example-box h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--pct-white);
    margin-bottom: 0.5rem;
}

.percent-calc-wrapper .example-box p {
    font-size: 0.9rem;
    color: var(--pct-muted);
    margin-bottom: 1rem;
}

.percent-calc-wrapper .example-solution {
    font-size: 0.85rem;
    color: var(--pct-gray);
    background: var(--pct-bg-card);
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    border-left: 3px solid var(--pct-purple);
}

.percent-calc-wrapper .example-solution .highlight {
    color: var(--pct-success);
    font-weight: 700;
}

/* FAQ */
.percent-calc-wrapper .faq-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.percent-calc-wrapper .faq-item {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--pct-border);
}

.percent-calc-wrapper .faq-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.percent-calc-wrapper .faq-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--pct-white);
    margin-bottom: 0.5rem;
}

.percent-calc-wrapper .faq-item p {
    font-size: 0.95rem;
    color: var(--pct-muted);
    line-height: 1.7;
}

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

@media (max-width: 768px) {
    .percent-calc-wrapper {
        padding: 2rem 1rem;
    }
    
    .percent-calc-wrapper .calc-title {
        font-size: 2rem;
    }
    
    .percent-calc-wrapper .calculators-grid {
        grid-template-columns: 1fr;
    }
    
    .percent-calc-wrapper .inline-form {
        justify-content: center;
    }
    
    .percent-calc-wrapper .reference-grid {
        grid-template-columns: 1fr;
    }
    
    .percent-calc-wrapper .formulas-grid {
        grid-template-columns: 1fr;
    }
    
    .percent-calc-wrapper .examples-grid {
        grid-template-columns: 1fr;
    }
    
    .percent-calc-wrapper .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .percent-calc-wrapper .step-item {
        flex-direction: row;
        text-align: left;
    }
}

@media (max-width: 480px) {
    .percent-calc-wrapper .calc-title {
        font-size: 1.75rem;
    }
    
    .percent-calc-wrapper .card-header {
        flex-direction: column;
        text-align: center;
    }
    
    .percent-calc-wrapper .inline-form {
        flex-direction: column;
        align-items: stretch;
    }
    
    .percent-calc-wrapper .form-input.small {
        width: 100%;
    }
    
    .percent-calc-wrapper .form-text {
        text-align: center;
    }
    
    .percent-calc-wrapper .result-value {
        font-size: 1.75rem;
    }
    
    .percent-calc-wrapper .info-title {
        font-size: 1.25rem;
    }
    
    .percent-calc-wrapper .reference-table {
        overflow-x: auto;
    }
}