:root {
    --accent: #2563EB;
    --accent-dark: #1D4ED8;
    --bg-primary: #0A0A0A;
    --bg-surface: #1A1A1A;
    --bg-elevated: #242424;
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.6);
    --border-subtle: rgba(255, 255, 255, 0.1);
    --border-medium: rgba(255, 255, 255, 0.2);
}

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

html, body {
    height: 100%;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden;
}

/* MudBlazor MudMainContent adds appbar padding-top even without an appbar */
.mud-main-content {
    padding-top: 0 !important;
}

/* ── Page layout ── */
.app-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
}

/* ── Header ── */
.app-header {
    padding: 1rem 2rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border-subtle);
}

.app-logo {
    display: inline-block;
    margin-bottom: 0.75rem;
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--text-primary);
}

.app-subtitle {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* ── Main content ── */
.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 1.5rem;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

/* ── Upload section ── */
.upload-section {
    width: 100%;
    text-align: center;
}

.upload-heading {
    font-size: 2rem;
    font-weight: 300;
    letter-spacing: -0.01em;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.upload-description {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto 2.5rem;
    line-height: 1.6;
}

/* ── Drop zone ── */
.drop-zone {
    position: relative;
    border: 1.5px dashed var(--border-medium);
    border-radius: 8px;
    padding: 3.5rem 2rem;
    transition: border-color 0.2s ease, background-color 0.2s ease;
    cursor: pointer;
    background-color: var(--bg-surface);
}

.drop-zone:hover,
.drop-zone--active {
    border-color: var(--accent);
    background-color: rgba(37, 99, 235, 0.06);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    pointer-events: none;
}

.upload-icon {
    font-size: 3rem !important;
    width: 3rem !important;
    height: 3rem !important;
    color: var(--text-secondary) !important;
    margin-bottom: 0.5rem;
}

.drop-zone-primary {
    font-size: 1.0625rem;
    font-weight: 400;
    color: var(--text-primary);
}

.drop-zone-secondary {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.upload-btn {
    pointer-events: all !important;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    padding: 0.625rem 1.75rem;
    background-color: var(--accent) !important;
    color: #fff !important;
    border: none;
    border-radius: 4px;
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-decoration: none;
    transition: background-color 0.15s ease;
}

.upload-btn:hover {
    background-color: var(--accent-dark) !important;
}

.drop-zone-hint {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.file-input-hidden {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

/* ── Processing ── */
.processing-overlay {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 9999;
    background: transparent;
    cursor: not-allowed;
}

.processing-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    position: relative;
    z-index: 10000;
}

.processing-spinner-wrap {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.processing-pct {
    position: absolute;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--mud-palette-primary);
    pointer-events: none;
}

.processing-text {
    font-size: 1rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

/* ── Error ── */
.error-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
}

.error-icon {
    font-size: 3rem !important;
    width: 3rem !important;
    height: 3rem !important;
}

.error-text {
    color: var(--text-secondary);
    max-width: 480px;
}

/* ── Results ── */
.results-section {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.summary-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    padding: 1.25rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.summary-card--accent {
    border-color: var(--accent);
    background-color: rgba(37, 99, 235, 0.08);
}

.summary-card__label {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.summary-card__value {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.summary-card--accent .summary-card__value {
    color: var(--accent);
}

/* ── Invoice table ── */
.invoice-table {
    background-color: var(--bg-surface) !important;
    border: 1px solid var(--border-subtle) !important;
    border-radius: 6px !important;
    overflow: hidden;
}

/* ── Results actions ── */
.results-actions {
    display: flex;
    justify-content: center;
    padding-top: 0.5rem;
}

/* ── Footer ── */
.app-footer {
    padding: 1.5rem;
    text-align: center;
    border-top: 1px solid var(--border-subtle);
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.app-footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

.app-footer a:hover {
    color: var(--text-primary);
}

.app-disclaimer {
    margin-top: 0.375rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* ── Blazor error UI ── */
#blazor-error-ui {
    background: #2a0a0a;
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(255, 0, 0, .2);
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
    color: #ff6b6b;
}

#blazor-error-ui .dismiss {
    cursor: pointer;
    position: absolute;
    right: 0.75rem;
    top: 0.5rem;
}

/* ── Responsive ── */
@media (max-width: 600px) {
    .upload-heading {
        font-size: 1.5rem;
    }

    .drop-zone {
        padding: 2.5rem 1rem;
    }

    .summary-card__value {
        font-size: 1.25rem;
    }
}