/* ═══════════════════════════════════════════════════════════
   styles.css — LiverDecoded Comprehensive Liver Risk Assessment
   ═══════════════════════════════════════════════════════════ */

:root {
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-card: #1a2234;
    --bg-input: #0d1320;
    --border: #2a3548;
    --border-focus: #3b82f6;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --accent-purple: #8b5cf6;
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.15);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.15);
    --danger: #f43f5e;
    --danger-bg: rgba(244, 63, 94, 0.15);
    --gradient-1: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
    --gradient-2: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
    --gradient-3: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container { max-width: 900px; margin: 0 auto; padding: 20px; }

/* Header */
header { text-align: center; padding: 30px 20px; margin-bottom: 24px; }
.logo-icon {
    width: 48px; height: 48px;
    background: var(--gradient-1);
    border-radius: 12px;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 24px; margin-bottom: 16px;
}
header h1 {
    font-size: 1.6rem; font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text; margin-bottom: 8px;
}
header p { color: var(--text-secondary); font-size: 0.95rem; }

/* Input Panel */
.input-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 24px;
}
.input-section { margin-bottom: 20px; }
.input-section:last-child { margin-bottom: 0; }
.input-section h3 {
    font-size: 0.8rem; font-weight: 600;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}
.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
}
.input-group { display: flex; flex-direction: column; }
.input-group label {
    font-size: 0.7rem; color: var(--text-muted);
    margin-bottom: 4px; font-weight: 500;
}
.input-group input, .input-group select {
    padding: 10px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: 'JetBrains Mono', monospace;
    transition: all 0.2s ease;
    width: 100%;
}
.input-group input:focus, .input-group select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}
.input-group input.calculated {
    background: var(--bg-secondary);
    color: var(--accent-cyan);
    border-style: dashed;
}
.input-group input::-webkit-outer-spin-button,
.input-group input::-webkit-inner-spin-button { -webkit-appearance: none; }
.input-group input[type="number"] { -moz-appearance: textfield; }

/* Unit selector */
.unit-input-wrapper { display: flex; gap: 0; }
.unit-input-wrapper input { flex: 1; border-radius: 8px 0 0 8px; min-width: 0; }
.unit-selector { display: flex; flex-direction: column; }
.unit-option {
    padding: 5px 6px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.65rem; font-weight: 600;
    cursor: pointer; text-align: center; min-width: 32px;
    transition: all 0.2s ease;
}
.unit-option:first-child { border-radius: 0 6px 0 0; border-bottom: none; }
.unit-option:last-child { border-radius: 0 0 6px 0; }
.unit-option.active { background: var(--accent-blue); border-color: var(--accent-blue); color: white; }
.unit-option:hover:not(.active) { background: var(--bg-input); color: var(--text-primary); }

.height-ft-in { display: flex; gap: 2px; flex: 1; }
.height-ft-in input { width: 50%; border-radius: 0; text-align: center; padding: 10px 4px; }
.height-ft-in input:first-child { border-radius: 8px 0 0 8px; }

/* Buttons */
.button-row { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.calculate-btn {
    flex: 2; min-width: 180px; padding: 12px 20px;
    background: var(--gradient-1); color: white; border: none;
    border-radius: 8px; font-size: 0.95rem; font-weight: 600;
    cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 8px;
    transition: all 0.3s ease;
}
.calculate-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(59, 130, 246, 0.3); }
.data-btn {
    flex: 1; min-width: 100px; padding: 12px 14px;
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: 8px; color: var(--text-secondary);
    font-size: 0.8rem; font-weight: 500; cursor: pointer;
    display: flex; align-items: center; justify-content: center; gap: 5px;
    transition: all 0.2s ease;
}
.data-btn:hover { background: var(--bg-input); color: var(--text-primary); border-color: var(--accent-blue); }
.data-btn input[type="file"] { display: none; }

.upload-message {
    display: none; padding: 10px 14px;
    background: var(--success-bg); border: 1px solid var(--success);
    border-radius: 8px; color: var(--success);
    font-size: 0.85rem; margin-top: 10px; text-align: center;
}
.upload-message.show { display: block; animation: fadeInOut 3s ease forwards; }
@keyframes fadeInOut {
    0% { opacity: 0; transform: translateY(-10px); }
    10% { opacity: 1; transform: translateY(0); }
    80% { opacity: 1; } 100% { opacity: 0; }
}

/* Results Panel */
.results-panel { display: flex; flex-direction: column; gap: 20px; }

/* Full Report Button */
.full-report-btn {
    width: 100%; padding: 14px;
    background: var(--gradient-2); color: white; border: none;
    border-radius: 10px; font-size: 0.9rem; font-weight: 600;
    cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 8px;
    transition: all 0.3s ease;
}
.full-report-btn:hover { box-shadow: 0 6px 20px rgba(16, 185, 129, 0.3); }

/* Results Card */
.results-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}
.card-header {
    padding: 14px 18px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    display: flex; align-items: center; gap: 10px;
}
.step-badge {
    background: var(--gradient-1); color: white;
    font-size: 0.65rem; font-weight: 700;
    padding: 3px 8px; border-radius: 12px; text-transform: uppercase;
}
.card-header h2 { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); }
.card-body { padding: 16px; }

/* Expandable Sections */
.expandable-header {
    display: flex; justify-content: space-between; align-items: center;
    cursor: pointer; padding: 14px 18px;
    background: var(--bg-secondary);
    transition: background 0.2s ease;
}
.expandable-header:hover { background: var(--bg-card); }
.expandable-header h2 { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); }
.expand-icon {
    font-size: 0.8rem; color: var(--text-muted);
    transition: transform 0.3s ease;
}
.expandable-header.expanded .expand-icon { transform: rotate(180deg); }
.expandable-body { display: none; padding: 16px 18px; border-top: 1px solid var(--border); }
.expandable-body.show { display: block; }

/* Score Cards */
.score-grid { display: flex; flex-direction: column; gap: 16px; }
.score-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.3s ease;
}
.score-card.low-risk { border-color: var(--success); }
.score-card.low-risk .score-main { background: var(--success-bg); }
.score-card.intermediate-risk { border-color: var(--warning); }
.score-card.intermediate-risk .score-main { background: var(--warning-bg); }
.score-card.high-risk { border-color: var(--danger); }
.score-card.high-risk .score-main { background: var(--danger-bg); }
.score-card.na-risk { opacity: 0.6; }
.score-card.na-risk .score-main { background: var(--bg-secondary); }

.score-main { padding: 16px; }
.score-top { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 8px; }
.score-name { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); }
.score-target { font-size: 0.7rem; color: var(--text-muted); margin-top: 2px; }

.risk-badge {
    font-size: 0.6rem; font-weight: 700; padding: 3px 8px;
    border-radius: 4px; text-transform: uppercase; white-space: nowrap;
}
.risk-badge.low { background: var(--success); color: white; }
.risk-badge.intermediate { background: var(--warning); color: #1a1a1a; }
.risk-badge.high { background: var(--danger); color: white; }
.risk-badge.na { background: var(--text-muted); color: white; }

.score-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.8rem; font-weight: 700;
    color: var(--text-primary); margin-bottom: 8px;
}
.score-summary {
    font-size: 0.8rem; color: var(--text-secondary);
    line-height: 1.5; margin-bottom: 12px;
}
.na-message {
    font-size: 0.8rem; color: var(--warning);
    font-style: italic; margin-bottom: 12px;
    display: flex; align-items: center; gap: 6px;
}
.score-bar-container {
    height: 5px; background: rgba(255,255,255,0.1);
    border-radius: 3px; overflow: hidden; margin-bottom: 12px;
}
.score-bar { height: 100%; border-radius: 3px; transition: width 0.5s ease; }
.score-bar.low { background: var(--success); }
.score-bar.intermediate { background: var(--warning); }
.score-bar.high { background: var(--danger); }

/* Deep Dive Button */
.deep-dive-btn {
    background: var(--bg-input); border: 1px solid var(--border);
    color: var(--accent-cyan); padding: 8px 14px;
    border-radius: 6px; font-size: 0.75rem; font-weight: 600;
    cursor: pointer; display: inline-flex; align-items: center; gap: 6px;
    transition: all 0.2s ease;
}
.deep-dive-btn:hover { background: var(--bg-secondary); border-color: var(--accent-cyan); }
.deep-dive-btn.expanded { background: var(--accent-cyan); border-color: var(--accent-cyan); color: var(--bg-primary); }

/* Deep Dive Content */
.deep-dive-content {
    display: none; padding: 20px;
    border-top: 1px solid var(--border);
    background: var(--bg-primary);
}
.deep-dive-content.show { display: block; }
.deep-dive-content h4 {
    font-size: 0.8rem; font-weight: 600;
    color: var(--accent-cyan); margin: 20px 0 10px 0;
    text-transform: uppercase; letter-spacing: 0.5px;
}
.deep-dive-content h4:first-child { margin-top: 0; }
.deep-dive-content p {
    font-size: 0.85rem; color: var(--text-secondary);
    line-height: 1.6; margin-bottom: 12px;
}
.formula-block {
    background: var(--bg-card); padding: 14px 16px;
    border-radius: 8px; font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem; color: var(--text-primary);
    overflow-x: auto; margin: 12px 0; white-space: pre-wrap;
    border: 1px solid var(--border);
}
.ref-table {
    width: 100%; border-collapse: collapse;
    margin: 12px 0; font-size: 0.8rem;
}
.ref-table th, .ref-table td {
    padding: 10px 12px; text-align: left;
    border: 1px solid var(--border);
}
.ref-table th {
    background: var(--bg-card); color: var(--text-primary);
    font-weight: 600;
}
.ref-table td { color: var(--text-secondary); }
.ref-table tr:nth-child(even) td { background: rgba(255,255,255,0.02); }

.limitations-list {
    list-style: none; padding: 0; margin: 12px 0;
}
.limitations-list li {
    font-size: 0.8rem; color: var(--text-secondary);
    padding: 6px 0 6px 20px; position: relative;
}
.limitations-list li::before {
    content: "•"; position: absolute; left: 0;
    color: var(--warning);
}
.simple-terms-box {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    border: 1px solid var(--accent-blue);
    border-radius: 8px; padding: 14px; margin: 12px 0;
}
.simple-terms-box p {
    margin: 0; color: var(--text-secondary);
}
.citation-box {
    background: var(--bg-card); padding: 12px 16px;
    border-radius: 8px; border-left: 3px solid var(--accent-purple);
    margin: 12px 0;
}
.citation-box p {
    font-size: 0.8rem; color: var(--text-secondary); margin: 0 0 6px 0;
}
.citation-box a { color: var(--accent-cyan); font-size: 0.75rem; word-break: break-all; }

/* Summary & Recommendations */
.summary-card {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    border-color: var(--accent-blue);
}
.recommendation-card {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1) 0%, rgba(244, 63, 94, 0.05) 100%);
    border-color: var(--warning);
}
.summary-item, .recommendation-step {
    display: flex; gap: 12px; padding: 12px 0;
    border-bottom: 1px solid var(--border);
}
.summary-item:last-child, .recommendation-step:last-child { border-bottom: none; padding-bottom: 0; }
.summary-item:first-child, .recommendation-step:first-child { padding-top: 0; }
.summary-icon, .step-number {
    width: 32px; height: 32px;
    background: var(--bg-secondary); border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px; flex-shrink: 0;
}
.step-number {
    background: var(--gradient-1); border-radius: 50%;
    font-size: 0.75rem; font-weight: 700; color: white;
}
.summary-content h4, .step-content h4 {
    font-size: 0.85rem; font-weight: 600; color: var(--text-primary); margin-bottom: 2px;
}
.summary-content p, .step-content p { font-size: 0.8rem; color: var(--text-secondary); }

/* Concordance */
.concordance-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 10px; margin-top: 12px;
}
.concordance-item {
    text-align: center; padding: 14px;
    background: var(--bg-secondary); border-radius: 8px;
    border: 1px solid var(--border);
}
.concordance-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.8rem; font-weight: 700;
}
.concordance-item.low .concordance-value { color: var(--success); }
.concordance-item.intermediate .concordance-value { color: var(--warning); }
.concordance-item.high .concordance-value { color: var(--danger); }
.concordance-label {
    font-size: 0.65rem; color: var(--text-muted);
    text-transform: uppercase; margin-top: 2px;
}

/* Disclaimer */
.disclaimer {
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: 8px; padding: 14px; margin-top: 8px;
}
.disclaimer h4 {
    font-size: 0.75rem; font-weight: 600;
    color: var(--text-secondary); margin-bottom: 4px;
}
.disclaimer p { font-size: 0.7rem; color: var(--text-muted); line-height: 1.4; }

/* Export Section */
.export-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
}
.export-section h3 {
    font-size: 0.9rem; font-weight: 600;
    color: var(--text-primary); margin-bottom: 16px;
}
.export-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}
.export-btn {
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    padding: 20px 16px;
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}
.export-btn:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.2);
}
.export-btn .export-icon {
    font-size: 2rem; margin-bottom: 8px;
}
.export-btn span:nth-child(2) {
    font-size: 0.9rem; font-weight: 600;
    color: var(--text-primary);
}
.export-btn .export-desc {
    font-size: 0.7rem; color: var(--text-muted);
    margin-top: 4px; text-align: center;
}
.pdf-btn:hover { border-color: var(--danger); }
.csv-btn:hover { border-color: var(--success); }

/* Responsive */
@media (max-width: 600px) {
    .input-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
    .button-row { flex-direction: column; }
    .concordance-grid { grid-template-columns: 1fr; }
    .score-value { font-size: 1.5rem; }
}

@media print {
    body { background: white; color: black; }
    .input-panel, .full-report-btn, .deep-dive-btn, .data-btn { display: none; }
    .deep-dive-content { display: block !important; }
    .score-card { break-inside: avoid; }
}