:root {
    --color-bg: #0a0f1c;
    --color-surface: #131a2e;
    --color-border: #1e2a45;
    --color-text: #e2e8f0;
    --color-muted: #8892a8;
    --color-accent: #6ee7b7;
    --color-danger: #f87171;
    --color-income: #6ee7b7;
    --color-expense: #f87171;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
    --max-width: 48rem;
    --radius: 0.75rem;
}

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

html, body {
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    min-height: 100vh;
}

.hero {
    text-align: center;
    padding: 4rem 1rem 2rem;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-accent);
    margin: 0 0 0.5rem;
    letter-spacing: -0.02em;
}

.tagline {
    color: var(--color-muted);
    font-size: 1.1rem;
    margin: 0;
}

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1rem 4rem;
}

.upload-section {
    margin-top: 2rem;
}

.upload-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    padding: 2rem;
    gap: 1rem;
    transition: border-color 0.2s ease, background-color 0.2s ease;
    background-color: var(--color-surface);
}

.upload-area:hover {
    border-color: var(--color-accent);
    background-color: rgba(110, 231, 183, 0.05);
}

.upload-icon {
    font-size: 3rem;
    color: var(--color-muted);
    line-height: 1;
    transition: color 0.2s ease;
}

.upload-area:hover .upload-icon {
    color: var(--color-accent);
}

.upload-text {
    color: var(--color-muted);
    font-size: 0.95rem;
    text-align: center;
}

.upload-btn {
    display: block;
    width: 100%;
    margin-top: 1rem;
    padding: 0.75rem 1.5rem;
    background-color: var(--color-accent);
    color: #0a0f1c;
    border: none;
    border-radius: 9999px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s ease, background-color 0.2s ease;
}

.upload-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.upload-btn:not(:disabled):hover {
    background-color: #a7f3d0;
}

.dashboard {
    margin-top: 2rem;
    padding-bottom: 4rem;
}

/* Upload status */
.upload-status {
    text-align: center;
    padding: 1rem 0;
    color: var(--color-muted);
}

/* Drag over state */
.upload-area.drag-over {
    border-color: var(--color-accent);
    background: rgba(110, 231, 183, 0.05);
}

.currency-section {
    margin-bottom: 2.5rem;
}

.currency-heading {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    color: var(--color-accent);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.direction-group {
    margin-bottom: 1.5rem;
}

.direction-heading {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.75rem;
}

.expense .direction-heading {
    color: var(--color-expense);
}

.income .direction-heading {
    color: var(--color-income);
}

/* Recurring table */
.recurring-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.recurring-table th {
    text-align: left;
    color: var(--color-muted);
    font-weight: normal;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

.recurring-table td {
    padding: 0.625rem 0.75rem;
    border-bottom: 1px solid var(--color-border);
}

.recurring-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

.expense .recurring-table td:nth-child(3),
.expense .recurring-table td:nth-child(4) {
    color: var(--color-expense);
}

.income .recurring-table td:nth-child(3),
.income .recurring-table td:nth-child(4) {
    color: var(--color-income);
}

.recurring-table tfoot td {
    font-weight: bold;
    border-top: 2px solid var(--color-border);
    border-bottom: none;
    padding-top: 0.75rem;
}

/* Messages */
.empty-msg {
    text-align: center;
    color: var(--color-muted);
    padding: 2rem;
    font-style: italic;
}

.error-msg {
    text-align: center;
    color: var(--color-danger);
    padding: 2rem;
}

/* Responsive: make tables scroll horizontally on small screens */
@media (max-width: 640px) {
    .recurring-table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}