:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #2563eb;
    --border: #e5e7eb;
    --success: #059669;
    --warning: #d97706;
    --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(180deg, #eef4ff 0%, var(--bg) 220px);
    color: var(--text);
    line-height: 1.5;
}

.page {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px;
}

.hero {
    margin-bottom: 24px;
}

.eyebrow {
    margin: 0 0 8px;
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.hero h1 {
    margin: 0 0 8px;
    font-size: 2rem;
}

.subtitle {
    margin: 0;
    color: var(--muted);
    max-width: 720px;
}

.layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    align-items: start;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.card h2 {
    margin-top: 0;
    margin-bottom: 16px;
    font-size: 1.125rem;
}

.upload-card {
    min-height: 320px;
}

.drop-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 220px;
    padding: 32px 24px;
    border: 2px dashed #93c5fd;
    border-radius: 16px;
    background: #f8fbff;
    cursor: pointer;
    transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.drop-zone:hover,
.drop-zone.is-dragover {
    border-color: var(--primary);
    background: #eff6ff;
    transform: translateY(-1px);
}

.drop-zone.is-busy {
    pointer-events: none;
    opacity: 0.75;
}

.drop-icon {
    font-size: 2.5rem;
}

.drop-title {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 700;
}

.drop-subtitle {
    margin: 0;
    color: var(--muted);
    font-size: 0.925rem;
}

.selected-file {
    margin: 8px 0 0;
    padding: 8px 12px;
    border-radius: 999px;
    background: #dbeafe;
    color: #1d4ed8;
    font-size: 0.875rem;
    font-weight: 600;
}

.processing {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
    padding: 12px 14px;
    border-radius: 10px;
    background: #eff6ff;
    color: #1d4ed8;
    font-weight: 600;
}

.processing p {
    margin: 0;
}

.spinner {
    width: 22px;
    height: 22px;
    border: 3px solid #bfdbfe;
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.hint {
    margin: 12px 0 0;
    color: var(--muted);
    font-size: 0.875rem;
}

.column-list {
    margin: 0;
    padding-left: 18px;
    color: var(--muted);
    font-size: 0.9rem;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 18px;
    border-radius: 10px;
    border: 1px solid #a7f3d0;
    text-decoration: none;
    font-weight: 700;
    cursor: pointer;
    background: #ecfdf5;
    color: var(--success);
}

.result-card {
    margin-top: 20px;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.stats {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.stat-pill {
    padding: 8px 12px;
    border-radius: 999px;
    background: #eff6ff;
    color: #1d4ed8;
    font-size: 0.875rem;
    font-weight: 600;
}

.stat-pill.success {
    background: #ecfdf5;
    color: #047857;
}

.stat-pill.warning {
    background: #fff7ed;
    color: #c2410c;
}

.result-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.tab-btn {
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #fff;
    color: var(--muted);
    font-weight: 600;
    cursor: pointer;
}

.tab-btn.active {
    background: #eff6ff;
    border-color: #bfdbfe;
    color: #1d4ed8;
}

.tab-panel.hidden {
    display: none;
}

.empty-row {
    text-align: center;
    color: var(--muted);
    white-space: normal;
}

td:nth-child(2),
td:nth-child(4) {
    white-space: normal;
    min-width: 180px;
}

.table-wrap {
    overflow: auto;
    border: 1px solid var(--border);
    border-radius: 12px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

th,
td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    white-space: nowrap;
}

th {
    background: #f8fafc;
    position: sticky;
    top: 0;
}

.toast {
    position: fixed;
    right: 24px;
    bottom: 24px;
    padding: 14px 18px;
    border-radius: 12px;
    background: #111827;
    color: #fff;
    box-shadow: var(--shadow);
    max-width: 360px;
}

.toast.error {
    background: #b91c1c;
}

.hidden {
    display: none !important;
}

@media (max-width: 900px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .result-header {
        flex-direction: column;
        align-items: flex-start;
    }
}