:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg-dark: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #818cf8;
    --border: #334155;
    --success: #10b981;
    --danger: #ef4444;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
}

.container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

header {
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo svg {
    color: var(--accent);
}

header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

header h1 span {
    color: var(--accent);
    font-weight: 300;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
}

main {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Drop Zone */
.drop-zone {
    background-color: var(--card-bg);
    border: 2px dashed var(--border);
    border-radius: 1rem;
    padding: 4rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--accent);
    background-color: rgba(79, 70, 229, 0.05);
}

.drop-zone.drag-over::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent, rgba(129, 140, 248, 0.1), transparent);
    animation: sweep 2s infinite;
}

@keyframes sweep {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
}

.drop-zone-content svg {
    color: var(--text-muted);
    transition: transform 0.3s ease;
}

.drop-zone:hover svg {
    transform: translateY(-5px);
    color: var(--accent);
}

.drop-zone p {
    font-size: 1.25rem;
    color: var(--text-muted);
}

.browse {
    color: var(--accent);
    font-weight: 600;
    text-decoration: underline;
}

/* Results Container */
.results-container {
    background-color: var(--card-bg);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--border);
    animation: fadeIn 0.5s ease-out;
}

.hidden {
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.actions {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    gap: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-family: inherit;
    font-size: 0.95rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border-color: var(--danger);
}

/* Table Styles */
.table-wrapper {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th {
    padding: 1rem;
    border-bottom: 2px solid var(--border);
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    font-family: 'JetBrains Mono', monospace;
}

tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

tfoot tr {
    background-color: rgba(79, 70, 229, 0.05);
}

tfoot td {
    border-top: 2px solid var(--primary);
    font-weight: 700;
    color: var(--accent);
}

.grand-total td:first-child {
    font-family: 'Inter', sans-serif;
    text-transform: uppercase;
    font-size: 0.9rem;
}

footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: auto;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}