:root {
    color-scheme: light dark;
    --bg: #f5f6f8;
    --panel-bg: #ffffff;
    --text: #1c1e21;
    --muted: #6b7280;
    --border: #dcdfe4;
    --accent: #2563eb;
    --accent-contrast: #ffffff;
    --danger: #dc2626;
    --danger-bg: #fef2f2;
    --success: #16a34a;
    --mono-bg: #0f172a;
    --mono-text: #e2e8f0;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14161a;
        --panel-bg: #1c1f26;
        --text: #e7e9ee;
        --muted: #9aa1ac;
        --border: #2c313c;
        --accent: #5b8def;
        --accent-contrast: #0b0d10;
        --danger: #f87171;
        --danger-bg: #2a1414;
        --success: #4ade80;
        --mono-bg: #0b0d10;
        --mono-text: #d7dbe3;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 32px 32px 64px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.app {
    width: 100%;
}

.app-header h1 {
    margin: 0 0 4px;
    font-size: 26px;
}

.app-header .sub {
    margin: 0 0 24px;
    color: var(--muted);
}

.dropzone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 36px 20px;
    text-align: center;
    background: var(--panel-bg);
    transition: border-color .15s, background .15s;
    cursor: pointer;
}

.dropzone.dragover {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 8%, var(--panel-bg));
}

.dropzone-icon {
    font-size: 32px;
    margin: 0 0 4px;
    color: var(--muted);
}

.dropzone p { margin: 4px 0; }

.dropzone .hint {
    color: var(--muted);
    font-size: 13px;
}

.link {
    color: var(--accent);
    cursor: pointer;
    text-decoration: underline;
}

.upload-status {
    margin-top: 14px;
    font-size: 14px;
    color: var(--muted);
}

.error-banner {
    margin-top: 14px;
    padding: 12px 16px;
    background: var(--danger-bg);
    border: 1px solid var(--danger);
    color: var(--danger);
    border-radius: 8px;
    font-size: 14px;
}

.panels {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    margin-top: 28px;
}

@media (min-width: 720px) {
    .panels { grid-template-columns: minmax(0, 25%) minmax(0, 1fr); }
}

.panel {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px 20px;
    min-width: 0;
}

.panel h2 {
    margin: 0 0 14px;
    font-size: 15px;
    text-transform: uppercase;
    letter-spacing: .04em;
    color: var(--muted);
}

.empty-hint {
    color: var(--muted);
    font-size: 14px;
    margin: 0;
}

.file-year { margin-bottom: 16px; }
.file-year:last-child { margin-bottom: 0; }

.file-year h3 {
    margin: 0 0 8px;
    font-size: 13px;
    color: var(--muted);
    font-weight: 600;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 10px;
    width: 100%;
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid transparent;
    background: none;
    cursor: pointer;
    font-size: 14px;
    color: var(--text);
    text-align: left;
}

.file-item:hover { background: color-mix(in srgb, var(--accent) 6%, transparent); }

.file-item.active {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 10%, transparent);
}

.file-item .file-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-item .file-size {
    color: var(--muted);
    font-size: 12px;
    flex-shrink: 0;
}

.preview-file-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.preview-filename {
    margin: 0;
    font-size: 16px;
    word-break: break-all;
}

.icon-btn {
    flex-shrink: 0;
    border: none;
    background: none;
    font-size: 18px;
    line-height: 1;
    padding: 4px 8px;
    border-radius: 6px;
    cursor: pointer;
    color: var(--muted);
}

.icon-btn:hover {
    background: var(--danger-bg);
    color: var(--danger);
}

.sheet-block {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px 16px;
    margin-bottom: 14px;
}

.sheet-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 10px;
}

.sheet-block-title {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sheet-block-header label {
    font-weight: 600;
    font-size: 14px;
}

.base-name-group {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.base-name-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
}

.table-name-field {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--muted);
}

#base-name-input,
.table-name-input {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 12px;
    padding: 5px 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
}

#base-name-input {
    flex: 1;
    max-width: 360px;
}

.table-name-input {
    min-width: 220px;
}

.table-name-input.out-of-sync {
    border-color: var(--accent);
}

.sample-scroll {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 8px;
}

table.sample {
    border-collapse: collapse;
    width: 100%;
    font-size: 12px;
    white-space: nowrap;
}

table.sample th, table.sample td {
    padding: 6px 10px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

table.sample th {
    color: var(--muted);
    font-weight: 600;
    background: color-mix(in srgb, var(--border) 35%, transparent);
}

.row-count {
    font-size: 12px;
    color: var(--muted);
    margin: 6px 0 0;
}

.options {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: flex-start;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 13px;
}

.option-group .group-label {
    color: var(--muted);
    font-weight: 600;
}

.option-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    cursor: pointer;
}

.option-group input[type="number"] {
    width: 90px;
    padding: 4px 6px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
}

.actions {
    margin-top: 20px;
    display: flex;
    justify-content: flex-end;
}

button.primary {
    background: var(--accent);
    color: var(--accent-contrast);
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

button.primary:disabled {
    opacity: .6;
    cursor: not-allowed;
}

button.primary:hover:not(:disabled) { opacity: .9; }

.result-block {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px 16px;
    margin-bottom: 14px;
}

.result-block h4 {
    margin: 0 0 6px;
    font-size: 14px;
}

.result-block .meta {
    color: var(--success);
    font-size: 13px;
    margin: 0 0 10px;
}

pre.sql {
    background: var(--mono-bg);
    color: var(--mono-text);
    padding: 12px 14px;
    border-radius: 8px;
    font-size: 12px;
    overflow-x: auto;
    margin: 0 0 8px;
}

pre.sql:last-child { margin-bottom: 0; }