/* ==========================================================================
   Evans' Index Longitudinal Calculator - Design System & Modern CSS
   Supervising Developer: Dr G Narenthiran FEBNS FRCS(SN)
   ========================================================================== */

:root {
    /* Color Palette */
    --bg-dark: #090d16;
    --bg-gradient: radial-gradient(circle at 50% 0%, #1e293b 0%, #0f172a 60%, #090d16 100%);
    
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(255, 255, 255, 0.08);
    --card-hover-border: rgba(56, 189, 248, 0.3);
    
    --primary-cyan: #38bdf8;
    --primary-gradient: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
    --accent-teal: #14b8a6;
    --accent-gradient: linear-gradient(135deg, #14b8a6 0%, #0d9488 100%);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --success-emerald: #10b981;
    --success-bg: rgba(16, 185, 129, 0.15);
    --warning-amber: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.15);
    --danger-red: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.15);
    
    --input-bg: rgba(15, 23, 42, 0.6);
    --input-border: rgba(148, 163, 184, 0.2);
    --input-focus-border: #38bdf8;
    --input-focus-glow: rgba(56, 189, 248, 0.25);
    
    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Outfit', 'Inter', sans-serif;
    
    /* Effects */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-pill: 9999px;
    
    --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.05);
    --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.15);
    --backdrop-blur: blur(16px);
}

/* Reset & Base Styling */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background: var(--bg-dark);
    background-image: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 0;
    margin: 0;
}

.app-wrapper {
    max-width: 1320px;
    margin: 0 auto;
    padding: 24px 20px 60px;
}

/* Main Header */
.main-header {
    margin-bottom: 28px;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-bg);
    backdrop-filter: var(--backdrop-blur);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 20px 28px;
    box-shadow: var(--shadow-card);
    flex-wrap: wrap;
    gap: 20px;
}

.brand-badge {
    display: flex;
    align-items: center;
    gap: 18px;
}

.brand-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.brand-text h1 {
    font-family: var(--font-heading);
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.brand-text .subtitle {
    font-size: 14px;
    color: var(--primary-cyan);
    font-weight: 500;
    margin-top: 2px;
}

.brand-text .subtitle a {
    color: var(--primary-cyan);
    text-decoration: underline;
}

.brand-text .subtitle a:hover {
    color: #fff;
}

.brand-text .developer-subtext {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.brand-text .developer-subtext a {
    color: var(--primary-cyan);
    text-decoration: none;
}

.brand-text .developer-subtext a:hover {
    text-decoration: underline;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

/* Buttons */
button {
    font-family: var(--font-main);
    font-size: 14px;
    font-weight: 600;
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

button:hover {
    transform: translateY(-1px);
}

button:active {
    transform: translateY(0);
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 16px rgba(14, 165, 233, 0.45);
}

.btn-accent {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 12px rgba(20, 184, 166, 0.3);
}

.btn-accent:hover {
    box-shadow: 0 6px 16px rgba(20, 184, 166, 0.45);
}

.btn-secondary {
    background: rgba(148, 163, 184, 0.12);
    color: var(--text-primary);
    border: 1px solid rgba(148, 163, 184, 0.2);
}

.btn-secondary:hover {
    background: rgba(148, 163, 184, 0.22);
}

/* Cards System */
.main-container {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.card {
    background: var(--card-bg);
    backdrop-filter: var(--backdrop-blur);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    transition: border-color 0.3s ease;
}

.card:hover {
    border-color: var(--card-hover-border);
}

.card-header {
    padding: 20px 28px;
    border-bottom: 1px solid var(--card-border);
    background: rgba(15, 23, 42, 0.4);
}

.card-header h2 {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-header h2 i {
    color: var(--primary-cyan);
}

.section-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.section-desc code {
    background: rgba(56, 189, 248, 0.15);
    color: var(--primary-cyan);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 12px;
}

.card-body {
    padding: 24px 28px;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

/* Form Controls */
.patient-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.form-group label i {
    color: var(--primary-cyan);
    font-size: 12px;
}

input[type="text"],
input[type="number"],
input[type="date"],
select {
    font-family: var(--font-main);
    font-size: 14px;
    padding: 10px 14px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    outline: none;
    transition: all 0.2s ease;
    width: 100%;
}

input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
}

input:focus, select:focus {
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 3px var(--input-focus-glow);
}

/* Units & Badges */
.unit-badge-pill {
    background: rgba(56, 189, 248, 0.12);
    border: 1px solid rgba(56, 189, 248, 0.3);
    color: var(--primary-cyan);
    padding: 4px 14px;
    border-radius: var(--radius-pill);
    font-size: 13px;
    font-weight: 600;
}

/* Table Styling */
.table-responsive {
    overflow-x: auto;
    margin-bottom: 18px;
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
}

.evans-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 980px;
    text-align: left;
}

.evans-table th {
    background: rgba(15, 23, 42, 0.8);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 14px 16px;
    border-bottom: 1px solid var(--card-border);
}

.evans-table th .required {
    color: var(--danger-red);
}

.evans-table td {
    padding: 12px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    vertical-align: middle;
}

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

.evans-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.col-tp {
    width: 110px;
    font-weight: 600;
    color: var(--primary-cyan);
}

.col-date {
    width: 160px;
}

.col-context {
    width: 170px;
}

.col-measurement {
    width: 210px;
}

.col-result {
    width: 140px;
    font-family: monospace;
    font-weight: 700;
    font-size: 16px;
}

.col-status {
    width: 160px;
}

.col-action {
    width: 80px;
    text-align: center;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 600;
}

.badge-normal {
    background: var(--success-bg);
    color: var(--success-emerald);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-elevated {
    background: var(--warning-bg);
    color: var(--warning-amber);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-danger {
    background: var(--danger-bg);
    color: var(--danger-red);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-empty {
    background: rgba(148, 163, 184, 0.1);
    color: var(--text-muted);
    border: 1px solid rgba(148, 163, 184, 0.15);
}

/* Table Toolbar */
.table-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 8px;
}

.btn-add-tp {
    background: var(--primary-gradient);
    color: #fff;
    font-size: 14px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.25);
}

.btn-add-tp:hover {
    box-shadow: 0 6px 16px rgba(14, 165, 233, 0.4);
}

.btn-icon-delete {
    background: rgba(239, 68, 68, 0.12);
    color: var(--danger-red);
    border: 1px solid rgba(239, 68, 68, 0.2);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
}

.btn-icon-delete:hover {
    background: rgba(239, 68, 68, 0.25);
}

.row-count-badge {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* KPI Summary Cards Grid */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.kpi-card {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.kpi-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.icon-blue { background: rgba(56, 189, 248, 0.15); color: #38bdf8; }
.icon-cyan { background: rgba(20, 184, 166, 0.15); color: #14b8a6; }
.icon-purple { background: rgba(168, 85, 247, 0.15); color: #c084fc; }
.icon-amber { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }

.kpi-details {
    display: flex;
    flex-direction: column;
}

.kpi-title {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

.kpi-value {
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
}

/* Chart Container & Placeholder */
.chart-wrapper {
    position: relative;
    width: 100%;
    min-height: 320px;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-placeholder {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.placeholder-icon {
    font-size: 48px;
    color: var(--primary-cyan);
    opacity: 0.5;
    margin-bottom: 12px;
}

.chart-placeholder h3 {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.chart-placeholder p {
    font-size: 13px;
    max-width: 480px;
    margin: 0 auto;
}

.chart-container {
    width: 100%;
    height: 340px;
    position: relative;
}

.hidden {
    display: none !important;
}

.chart-tag {
    background: rgba(168, 85, 247, 0.15);
    border: 1px solid rgba(168, 85, 247, 0.3);
    color: #c084fc;
    padding: 4px 12px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 600;
}

/* Chart Legend Box */
.chart-legend-box {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    margin-top: 16px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--text-secondary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.legend-color {
    width: 14px;
    height: 14px;
    border-radius: 3px;
}

.color-normal { background: #10b981; }
.color-elevated { background: #ef4444; }

.legend-line {
    width: 24px;
    height: 3px;
    border-top: 3px dashed #f59e0b;
}

/* Clinical Reference & Diagram Section */
.reference-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 28px;
    align-items: start;
}

@media (max-width: 900px) {
    .reference-grid {
        grid-template-columns: 1fr;
    }
}

.diagram-wrapper {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 12px;
    text-align: center;
}

.evans-diagram-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    display: block;
}

.image-caption {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 10px;
}

.reference-content h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-cyan);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.formula-box {
    background: rgba(15, 23, 42, 0.8);
    border-left: 4px solid var(--primary-cyan);
    padding: 14px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 20px;
    font-size: 15px;
    text-align: center;
}

.threshold-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.threshold-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: rgba(15, 23, 42, 0.5);
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--card-border);
}

.threshold-list li strong {
    color: var(--text-primary);
    font-size: 14px;
}

.threshold-list li p {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.clinical-note {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.25);
    color: #fcd34d;
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    line-height: 1.5;
}

.clinical-note i {
    color: var(--warning-amber);
    margin-right: 6px;
}

/* Main Footer */
.main-footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--card-border);
    font-size: 13px;
    color: var(--text-muted);
}

.footer-stats-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.stat-badge {
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid var(--card-border);
    padding: 6px 16px;
    border-radius: var(--radius-pill);
    font-size: 13px;
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease;
}

.stat-badge:hover {
    border-color: rgba(56, 189, 248, 0.4);
    transform: translateY(-1px);
}

.stat-badge i {
    color: var(--primary-cyan);
}

.stat-badge strong {
    color: var(--text-primary);
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 700;
}

.main-footer .disclaimer {
    font-size: 12px;
    margin-top: 6px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Print Only Styles */
.print-only {
    display: none;
}

@media print {
    body {
        background: #fff !important;
        color: #000 !important;
    }
    
    .app-wrapper {
        max-width: 100% !important;
        padding: 0 !important;
    }
    
    .main-header, .main-container, .main-footer {
        display: none !important;
    }
    
    .print-only {
        display: block !important;
        padding: 20px;
        font-family: Arial, sans-serif;
    }
    
    .print-header h2 {
        font-size: 22px;
        margin-bottom: 4px;
    }
    
    .print-patient-meta {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
        margin: 16px 0;
        font-size: 14px;
        border-bottom: 1px solid #ccc;
        padding-bottom: 12px;
    }
    
    .print-table {
        width: 100%;
        border-collapse: collapse;
        margin: 16px 0;
    }
    
    .print-table th, .print-table td {
        border: 1px solid #000;
        padding: 8px 10px;
        font-size: 12px;
        text-align: left;
    }
    
    .print-table th {
        background: #f0f0f0;
    }
    
    .print-section {
        margin-top: 20px;
    }
    
    .print-footer {
        margin-top: 40px;
        font-size: 11px;
        color: #555;
        border-top: 1px solid #ccc;
        padding-top: 8px;
    }
}