:root {
    --blue-50: #eff6ff;
    --blue-100: #dbeafe;
    --blue-500: #3b82f6;
    --blue-600: #2563eb;
    --blue-700: #1d4ed8;
    --blue-900: #1e3a5f;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --green-50: #f0fdf4;
    --green-600: #16a34a;
    --green-700: #15803d;
    --red-50: #fef2f2;
    --red-500: #ef4444;
    --red-700: #b91c1c;
    --radius: 8px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-100);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Nav */
nav {
    background: var(--blue-900);
    color: white;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: baseline;
    gap: 1rem;
    box-shadow: var(--shadow-md);
}

nav .logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
    letter-spacing: -0.02em;
}

nav .nav-subtitle {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.6);
}

/* Main */
main {
    flex: 1;
    max-width: 960px;
    width: 100%;
    margin: 1.5rem auto;
    padding: 0 1rem;
}

/* Card */
.card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.card-header h2 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.15rem;
}

.card-header .subtitle {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.card form,
.card > .summary-cards,
.card > .claims-details,
.card > .result-actions {
    padding: 1.5rem;
}

/* Form */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.35rem;
}

textarea {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-family: "SF Mono", "Cascadia Code", "Consolas", monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    resize: vertical;
    transition: border-color 0.15s, box-shadow 0.15s;
    background: var(--gray-50);
}

textarea:focus {
    outline: none;
    border-color: var(--blue-500);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
    background: white;
}

textarea::placeholder {
    color: var(--gray-400);
}

input[type="date"],
input[type="text"],
select {
    padding: 0.45rem 0.65rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 0.875rem;
    transition: border-color 0.15s, box-shadow 0.15s;
    background: white;
}

input[type="date"]:focus,
input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--blue-500);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s;
}

.btn-primary {
    background: var(--blue-600);
    color: white;
}

.btn-primary:hover {
    background: var(--blue-700);
}

.btn-secondary {
    background: white;
    color: var(--gray-700);
    border-color: var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-50);
}

.btn-lg {
    padding: 0.65rem 2rem;
    font-size: 1rem;
}

.extract-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

/* Alert */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.alert-error {
    background: var(--red-50);
    color: var(--red-700);
    border: 1px solid rgba(239,68,68,0.2);
}

/* Review page */
.review-controls {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.control-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.detected-badge {
    font-size: 0.75rem;
    color: var(--blue-600);
    font-style: italic;
}

.table-wrapper {
    overflow-x: auto;
    margin-bottom: 1.25rem;
}

.review-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.review-table th {
    text-align: left;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.5rem;
    border-bottom: 2px solid var(--gray-200);
}

.review-table td {
    padding: 0.3rem 0.5rem;
    border-bottom: 1px solid var(--gray-100);
    vertical-align: middle;
}

.review-table tr:hover {
    background: var(--blue-50);
}

.col-num {
    width: 3rem;
    color: var(--gray-400);
    font-size: 0.8rem;
}

.col-amount { width: 40%; }
.col-date { width: 40%; }
.col-actions { width: 2.5rem; text-align: center; }

.input-amount, .input-date {
    width: 100%;
    border: 1px solid transparent;
    background: transparent;
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    font-size: 0.875rem;
}

.input-amount { text-align: right; font-variant-numeric: tabular-nums; }

.input-amount:focus, .input-date:focus {
    border-color: var(--blue-500);
    background: white;
    box-shadow: 0 0 0 2px rgba(59,130,246,0.15);
    outline: none;
}

.btn-remove {
    background: none;
    border: none;
    color: var(--gray-400);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    line-height: 1;
}

.btn-remove:hover {
    background: var(--red-50);
    color: var(--red-500);
}

.review-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

/* Results */
.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    padding: 1.5rem;
}

.summary-card {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
}

.summary-card-total {
    background: var(--blue-50);
    border-color: rgba(59,130,246,0.2);
}

.summary-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 0.25rem;
}

.summary-value {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--gray-900);
    font-variant-numeric: tabular-nums;
}

.summary-card-total .summary-value {
    color: var(--blue-700);
}

/* Claims */
.claims-details {
    padding: 0 1.5rem 1.5rem;
}

.claims-details > summary {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-600);
    cursor: pointer;
    padding: 0.5rem 0;
    margin-bottom: 0.75rem;
    user-select: none;
}

.claim {
    margin-bottom: 1.25rem;
}

.claim-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    padding: 0.5rem 0.75rem;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius) var(--radius) 0 0;
    font-size: 0.875rem;
}

.claim-num {
    font-weight: 700;
    color: var(--gray-400);
    font-size: 0.8rem;
}

.claim-principal {
    font-weight: 700;
    color: var(--gray-900);
}

.claim-date {
    color: var(--gray-500);
}

.claim-interest {
    margin-left: auto;
    font-weight: 600;
    color: var(--blue-600);
}

.detail-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
    font-variant-numeric: tabular-nums;
    border: 1px solid var(--gray-200);
    border-top: none;
    border-radius: 0 0 var(--radius) var(--radius);
    overflow: hidden;
}

.detail-table th {
    text-align: left;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.35rem 0.6rem;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.detail-table td {
    padding: 0.3rem 0.6rem;
    border-bottom: 1px solid var(--gray-100);
}

.detail-table tbody tr:hover {
    background: var(--blue-50);
}

.detail-table tfoot td {
    background: var(--gray-50);
    border-top: 2px solid var(--gray-200);
    padding: 0.4rem 0.6rem;
}

.text-right { text-align: right; }

.result-actions {
    padding: 0 1.5rem 1.5rem;
}

/* Loading overlay */
.loading-overlay {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 2.5rem 1rem;
    margin-top: 1rem;
    background: var(--blue-50);
    border: 1px solid rgba(59,130,246,0.15);
    border-radius: var(--radius);
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--blue-600);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 0.9rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* Footer */
footer {
    text-align: center;
    padding: 1rem;
    font-size: 0.8rem;
    color: var(--gray-400);
}

/* Responsive */
@media (max-width: 640px) {
    main { margin: 0.75rem auto; }
    .card form, .summary-cards, .claims-details, .result-actions { padding: 1rem; }
    .card-header { padding: 1rem; }
    .review-controls { flex-direction: column; gap: 0.75rem; }
    .summary-cards { grid-template-columns: 1fr; }
    .claim-header { font-size: 0.8rem; }
    nav { padding: 0.5rem 1rem; }
}