style.css

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-color: #1f2937;
    --border-color: #e5e7eb;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

header p {
    color: #6b7280;
}

.upload-section {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
    text-align: center;
}

.drop-zone {
    border: 2px dashed var(--border-color);
    padding: 3rem;
    border-radius: 0.5rem;
    transition: border-color 0.3s;
}

.drop-zone.dragover {
    border-color: var(--primary-color);
    background-color: #eff6ff;
}

.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
    font-size: 1rem;
}

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

.primary:hover {
    background-color: var(--primary-hover);
}

.secondary {
    background-color: #9ca3af;
    color: white;
}

.secondary:hover {
    background-color: #6b7280;
}

.hidden {
    display: none !important;
}

/* Controls Layout */
.controls-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.search-container {
    flex: 3;
}

.filter-container {
    flex: 1;
    min-width: 200px;
    display: flex;
    gap: 0.5rem;
}

.account-select {
    flex: 1;
    width: auto;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1.1rem;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    background-color: white;
    cursor: pointer;
}

.search-container input {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1.1rem;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-container input:focus,
.account-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.stats {
    margin-top: 0.5rem;
    color: #6b7280;
    font-size: 0.9rem;
    text-align: right;
}

.table-container {
    background: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed; /* Enforce fixed column widths for stability */
    min-width: 900px; /* Increased slightly for extra column */
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    vertical-align: top; /* Align to top for multi-line content */
    word-wrap: break-word; /* Allow long words to break */
}

/* Column Widths */
th:nth-child(1) { width: 120px; } /* Date - Fixed */
th:nth-child(2) { width: auto; } /* Account - Flexible to accomodate long account names */
th:nth-child(3) { width: auto; }  /* Description - Flexible & Wrapping */
th:nth-child(4) { width: 200px; } /* Transaction Type - Fixed */
th:nth-child(5) { width: 150px; } /* Amount - Fixed */

th {
    background-color: #f9fafb;
    font-weight: 600;
}

/* Sorting Styles */
th.sortable {
    cursor: pointer;
    user-select: none;
    transition: background-color 0.2s;
}

th.sortable:hover {
    background-color: #e5e7eb;
}

.sort-icon::after {
    content: '↕';
    opacity: 0.3;
    margin-left: 5px;
    font-size: 0.8em;
}

th.sort-asc .sort-icon::after {
    content: '↑';
    opacity: 1;
}

th.sort-desc .sort-icon::after {
    content: '↓';
    opacity: 1;
}

tr:hover {
    background-color: #f9fafb;
}

.highlight {
    background-color: #fef08a;
    padding: 0 2px;
    border-radius: 2px;
}

#loading-indicator {
    text-align: center;
    padding: 2rem;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.summary-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.summary-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    text-align: center;
}

.summary-card h3 {
    font-size: 0.875rem;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.summary-card p {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
}

.summary-card.income p {
    color: #059669; /* Green */
}

.summary-card.expense p {
    color: #dc2626; /* Red */
}

.amount-positive {
    color: #059669;
    font-weight: 600;
}

.amount-negative {
    color: #dc2626;
    font-weight: 600;
}

.filtered-summary {
    background: #e0f2fe; /* Light Blue */
    border: 1px solid #bae6fd;
    color: #0c4a6e;
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    font-weight: 500;
}

.filtered-summary span {
    white-space: nowrap;
}

/* Guide Section Styles */
.guide-section {
    margin-bottom: 2rem;
}

.guide-section details {
    background: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: all 0.3s ease;
}

.guide-section summary {
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    color: var(--primary-color);
    background-color: #eff6ff;
    list-style: none; /* Hide default triangle in some browsers */
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.guide-section summary::after {
    content: '+';
    font-size: 1.2rem;
    font-weight: bold;
    transition: transform 0.2s;
}

.guide-section details[open] summary::after {
    transform: rotate(45deg);
}

.guide-section summary:hover {
    background-color: #dbeafe;
}

/* For browsers that don't hide default marker with list-style: none */
.guide-section summary::-webkit-details-marker {
    display: none;
}

.guide-content {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.steps-list {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.steps-list li {
    margin-bottom: 0.5rem;
    padding-left: 0.5rem;
}

.steps-list strong {
    color: var(--primary-color);
}

.tip-box {
    background-color: #fffbeb; /* Light yellow */
    border: 1px solid #fcd34d;
    border-radius: 0.5rem;
    padding: 1rem;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.tip-icon {
    font-size: 1.5rem;
}

.tip-box p {
    margin: 0;
    font-size: 0.95rem;
    color: #92400e;
}

.tip-box code {
    background: rgba(255, 255, 255, 0.5);
    padding: 0.1rem 0.3rem;
    border-radius: 0.2rem;
    font-family: monospace;
    font-weight: bold;
    border: 1px solid #fcd34d;
}