/**
 * RC Feed Calculator - Modern, Clean Design
 * Professional pool chemical calculator styling
 */

/* CSS Variables for consistent theming */
:root {
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;

    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;

    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-accent: #f1f5f9;

    --border-color: #e2e8f0;
    --border-light: #f1f5f9;

    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
}

.rc-feed-calculator {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    overflow: hidden;
}

/* Header Section */
.calculator-header {
    background: linear-gradient(135deg, var(--e-global-color-primary) 0%, var(--e-global-color-secondary) 100%);
    color: white;
    padding: 2rem;
    text-align: center;
    position: relative;
}

.calculator-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.1"/><circle cx="10" cy="60" r="0.5" fill="white" opacity="0.1"/><circle cx="90" cy="40" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.calculator-title {
    margin: 0 0 0.5rem 0;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.calculator-description {
    margin: 0;
    font-size: var(--font-size-lg);
    opacity: 0.9;
    font-weight: 400;
    position: relative;
    z-index: 1;
}

/* Form Sections */
.calculator-form {
    padding: 2rem;
}

.input-section,
.feeder-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
}

.section-title {
    margin: 0 0 1.5rem 0;
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-title::before {
    content: '';
    width: 4px;
    height: 1.5rem;
    background: var(--e-global-color-primary);
    border-radius: 2px;
}

/* Form Grid */
.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .feeder-section .form-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* Input Groups */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-label {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.label-text {
    font-size: var(--font-size-base);
    line-height: 1.2;
}

.label-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 400;
}

.label-required {
    color: var(--danger-color);
    font-weight: 700;
}

/* Input with Unit */
.input-with-unit {
    display: flex;
    align-items: stretch;
    background: var(--bg-primary);
    border: 2px solid #eee;
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: all 0.2s ease;
}

.input-with-unit:hover {
    border-color: var(--primary-light);
}

.input-with-unit:focus-within {
    border-color: var(--e-global-color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.input-with-unit input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none !important;
    background: transparent;
    font-size: var(--font-size-base);
    color: var(--text-primary);
    outline: none;
}

.input-with-unit input::placeholder {
    color: var(--text-muted);
}

.unit-label {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-accent);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: var(--font-size-sm);
    border-left: 1px solid var(--border-color);
    white-space: nowrap;
}

/* Results Section */
.results-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    padding: 2rem;
}

.table-container {
    margin-bottom: 2rem;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.results-table th,
.results-table td {
    padding: 1rem 0.75rem;
    text-align: center;
}

.results-table th {
    background: var(--bg-accent);
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-xs);
    letter-spacing: 0.5px;
    vertical-align: middle;
}

.header-group {
    background: linear-gradient(90deg, var(--bg-accent) 0%, var(--border-light) 100%);
    font-weight: 600;
}

.header-secondary {
    font-weight: 500;
    color: var(--text-secondary);
}

.results-table tbody tr {
    transition: background-color 0.2s ease;
}

.results-table tbody tr:hover:not(.no-results) {
    background: var(--bg-accent);
}

.results-table tbody tr:nth-child(even):not(.no-results) {
    background: rgba(248, 250, 252, 0.5);
}

/* Empty State */
.empty-state {
    padding: 3rem 1rem;
    text-align: center;
    background: var(--bg-secondary);
}

.empty-state-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.empty-state-icon {
    font-size: 3rem;
    opacity: 0.5;
}

.empty-state p {
    margin: 0;
    color: var(--text-muted);
    font-size: var(--font-size-base);
}

/* Info Panel */
.info-panel {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-accent) 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.info-title {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-title::before {
    content: 'ℹ️';
    font-size: 1.25em;
}

.info-list {
    margin: 0;
    padding-left: 1.25rem;
    list-style: none;
}

.info-list li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.5;
    position: relative;
}

.info-list li::before {
    content: '•';
    color: var(--e-global-color-primary);
    font-weight: bold;
    position: absolute;
    left: -1rem;
}

.info-list li:last-child {
    margin-bottom: 0;
}

.btn-primary {
    background-color: var(--e-global-color-primary) !important;
    color: #fff !important;
    border: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .rc-feed-calculator {
        margin: 1rem;
        border-radius: var(--radius-md);
    }

    .calculator-header,
    .calculator-form,
    .results-section {
        padding: 1.5rem;
    }

    .calculator-title {
        font-size: var(--font-size-2xl);
    }

    .calculator-description {
        font-size: var(--font-size-base);
    }

    .input-section,
    .feeder-section {
        padding: 1rem;
    }

    .section-title {
        font-size: var(--font-size-lg);
    }

    .form-actions {
        padding: 0 0 1.5rem 0 !important;
    }

    .btn-primary {
        font-size: var(--font-size-base);
        padding: 0.875rem 1.5rem;
    }

    .table-container {
        overflow-x: auto;
    }

    .results-table {
        min-width: 600px;
    }

    .results-table th,
    .results-table td {
        padding: 0.75rem 0.5rem;
    }

    .info-panel {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .rc-feed-calculator {
        margin: 0.5rem;
    }

    .calculator-header,
    .calculator-form,
    .results-section {
        padding: 1rem;
    }

    .input-section,
    .feeder-section {
        padding: 0.75rem;
        margin-bottom: 1rem;
    }

    .calculator-title {
        font-size: var(--font-size-xl);
    }

    .form-actions {
        padding: 0 1rem 1rem;
    }
}

/* Animation and Loading States */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Accessibility Improvements */
.rc-feed-calculator input:focus,
.rc-feed-calculator button:focus {
    outline: 2px solid var(--e-global-color-primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .rc-feed-calculator {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }

    .calculator-header {
        background: var(--bg-primary) !important;
        color: var(--text-primary) !important;
    }

    .btn-primary {
        display: none;
    }
}