:root {
    --bg-color: #f3f4f6;
    --container-bg: #ffffff;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #10b981;
    --secondary-hover: #059669;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --cell-border: #000000;
    --red: #ef4444;
    --blue: #3b82f6;
    --black: #000000;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    padding: 2rem;
    min-height: 100vh;
}

.app-container {
    background: var(--container-bg);
    max-width: 1200px;
    width: 100%;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

.upload-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--primary);
    border-radius: 12px;
    padding: 3rem 2rem;
    background-color: #e0e7ff;
    transition: all 0.3s ease;
}

.upload-section:hover {
    background-color: #c7d2fe;
}

.file-input {
    display: none;
}

.upload-label {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.upload-icon .icon {
    width: 40px;
    height: 40px;
    color: var(--primary);
}

.upload-label span {
    font-weight: 600;
    color: var(--primary);
    font-size: 1.1rem;
}

.file-name {
    margin-top: 1rem;
    font-weight: 500;
    color: var(--text-main);
}

.controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
    color: white;
}

.btn:active {
    transform: translateY(1px);
}

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

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

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--primary);
    font-weight: 500;
}

.spinner {
    border: 4px solid rgba(79, 70, 229, 0.2);
    border-left-color: var(--primary);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    animation: spin 1s linear infinite;
}

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

.results-section {
    overflow-x: auto;
    width: 100%;
    margin-top: 1rem;
}

/* Excel-like Table Styling */
.excel-table {
    border-collapse: collapse;
    background-color: #fff;
    margin: 0 auto;
}

.excel-table td {
    border: 1px solid var(--cell-border);
    width: 25px;
    height: 25px;
    min-width: 25px;
    text-align: center;
    vertical-align: middle;
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0;
}

.cell-A {
    color: var(--red);
}

.cell-B {
    color: var(--blue);
}

.cell-Tie {
    color: var(--black);
    font-size: 0.65rem; /* smaller font size to fit fully */
}