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

:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #222;
    --bg-tertiary: #2a2a2a;
    --bg-hover: #303030;
    --border: #3a3a3a;
    --border-light: #444;
    --text-primary: #d8d8d8;
    --text-secondary: #999;
    --text-muted: #666;
    --accent: #6a9fb5;
    --accent-hover: #7ab5cc;
    --error: #c66;
    --font-mono: 'SF Mono', 'Consolas', 'Liberation Mono', 'Menlo', monospace;
    --font-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

html {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-system);
    font-size: 13px;
    line-height: 1.4;
}

body {
    min-height: 100vh;
}

/* ---- HEADER ---- */

#header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

#header h1 {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

#header h1 a {
    color: var(--text-primary);
    text-decoration: none;
}

#header-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--text-secondary);
}

.meta-browser {
    padding: 2px 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
}

.meta-count {
    font-family: var(--font-mono);
}

#header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

#github-link {
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    padding: 4px;
    margin-left: 4px;
}

#github-link:hover {
    color: var(--text-primary);
}

/* ---- BUTTONS ---- */

button {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 5px 12px;
    font-family: var(--font-system);
    font-size: 12px;
    cursor: pointer;
}

button:hover {
    background: var(--bg-hover);
    border-color: var(--border-light);
}

button:active {
    background: var(--bg-primary);
}

#btn-delete {
    color: var(--error);
    border-color: var(--error);
}

#btn-delete:hover {
    background: rgba(204, 102, 102, 0.12);
}

/* ---- DROP ZONE ---- */

#drop-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 42px - 36px);
    padding: 40px 20px;
    gap: 24px;
}

#drop-zone.collapsed {
    min-height: 0;
    padding: 0;
    height: 0;
    overflow: hidden;
    gap: 0;
}

#drop-area {
    width: 100%;
    max-width: 420px;
    padding: 40px 32px 32px;
    border: 2px dashed var(--border);
    text-align: center;
    background: var(--bg-secondary);
}

#drop-area.dragover {
    border-color: var(--accent);
}

.drop-icon {
    font-size: 32px;
    color: var(--text-muted);
    margin-bottom: 12px;
    line-height: 1;
}

.drop-prompt {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.file-input-wrap {
    margin-bottom: 14px;
}

#file-input {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
}

#file-input + label {
    display: inline-block;
    padding: 8px 24px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-size: 12px;
    cursor: pointer;
}

#file-input + label:hover {
    background: var(--bg-hover);
    border-color: var(--border-light);
}

.supported {
    font-size: 11px;
    color: var(--text-muted);
}

.landing-footer {
    text-align: center;
    max-width: 420px;
}

.privacy-notice {
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.5;
    margin: 0;
}

.drop-guide-hint {
    margin-top: 8px;
    font-size: 12px;
}

.drop-guide-hint a {
    color: var(--accent);
    text-decoration: none;
}

.drop-guide-hint a:hover {
    color: var(--accent-hover);
}

#error-msg {
    padding: 10px 16px;
    color: var(--error);
    border: 1px solid var(--error);
    background: rgba(204, 102, 102, 0.08);
    font-size: 12px;
    max-width: 420px;
    width: 100%;
    text-align: center;
}

/* ---- FILE META ---- */

#file-meta {
    padding: 10px 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.file-meta-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 24px;
}

.file-meta-row {
    display: flex;
    gap: 8px;
    font-size: 11px;
    line-height: 1.6;
}

.file-meta-label {
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    white-space: nowrap;
}

.file-meta-value {
    color: var(--text-secondary);
    word-break: break-all;
}

/* ---- RESULTS ---- */

#results-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
    flex-wrap: wrap;
    gap: 8px;
}

#tab-bar {
    display: flex;
    gap: 2px;
}

.tab-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 5px 14px;
    font-size: 12px;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.tab-btn.active {
    color: var(--text-primary);
    border-color: var(--border);
    background: var(--bg-tertiary);
}

#toolbar {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ---- SEARCH ---- */

#search-input {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 5px 10px;
    font-family: var(--font-system);
    font-size: 12px;
    width: 200px;
}

#search-input::placeholder {
    color: var(--text-muted);
}

#search-input:focus {
    outline: none;
    border-color: var(--accent);
}

/* ---- DATE FILTER ---- */

#date-from, #date-to {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 4px 8px;
    font-family: var(--font-system);
    font-size: 11px;
    width: 130px;
    color-scheme: dark;
}

#date-from:focus, #date-to:focus {
    outline: none;
    border-color: var(--accent);
}

#btn-date-clear {
    font-size: 11px;
    padding: 4px 8px;
}

/* ---- TIMEZONE ---- */

#tz-selector select {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 5px 8px;
    font-family: var(--font-mono);
    font-size: 11px;
    cursor: pointer;
    max-width: 280px;
}

#tz-selector select:hover {
    border-color: var(--border-light);
}

/* ---- COLUMN PICKER ---- */

#column-picker {
    position: relative;
    z-index: 100;
}

.picker-inner {
    position: absolute;
    right: 20px;
    top: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    width: 260px;
    max-height: 400px;
    overflow-y: auto;
    z-index: 101;
}

.picker-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.picker-header a {
    color: var(--accent);
    text-decoration: none;
    text-transform: none;
    font-weight: 400;
    letter-spacing: 0;
}

.picker-header a:hover {
    color: var(--accent-hover);
}

.picker-list {
    padding: 6px 0;
}

.picker-list label {
    display: block;
    padding: 3px 12px;
    font-size: 12px;
    cursor: pointer;
    color: var(--text-primary);
}

.picker-list label:hover {
    background: var(--bg-hover);
}

.picker-list input[type="checkbox"] {
    margin-right: 6px;
    vertical-align: middle;
    accent-color: var(--accent);
}

/* ---- TABLE ---- */

#table-container {
    overflow-x: auto;
    padding: 0;
}

.empty-state {
    padding: 40px 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
    table-layout: auto;
}

thead {
    position: sticky;
    top: 0;
    z-index: 10;
}

th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    text-align: left;
    padding: 6px 10px;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
    user-select: none;
}

th.sortable {
    cursor: pointer;
}

th.sortable:hover {
    color: var(--text-primary);
}

th.sorted {
    color: var(--accent);
}

td {
    padding: 4px 10px;
    border-bottom: 1px solid var(--border);
    max-width: 500px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    vertical-align: top;
}

.mono {
    font-family: var(--font-mono);
    font-size: 11px;
}

.row-num {
    color: var(--text-muted);
    font-size: 11px;
    width: 50px;
    min-width: 50px;
    text-align: right;
    padding-right: 14px;
}

tbody tr:nth-child(odd) {
    background: var(--bg-primary);
}

tbody tr:nth-child(even) {
    background: var(--bg-secondary);
}

tbody tr:hover {
    background: var(--bg-hover);
}

/* ---- PAGINATION ---- */

#pagination {
    padding: 10px 20px;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

.pagination-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.page-info {
    font-size: 12px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.page-buttons {
    display: flex;
    align-items: center;
    gap: 3px;
}

.page-buttons button {
    min-width: 32px;
    text-align: center;
    padding: 4px 8px;
    font-size: 12px;
    font-family: var(--font-mono);
}

.page-btn.active {
    background: var(--accent);
    color: var(--bg-primary);
    border-color: var(--accent);
}

.page-ellipsis {
    padding: 0 4px;
    color: var(--text-muted);
}

/* ---- GUIDE OVERLAY ---- */

#guide-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 40px 20px;
    overflow-y: auto;
}

#guide-overlay[hidden] {
    display: none;
}

.guide-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    width: 100%;
    max-width: 680px;
    padding: 0;
}

.guide-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
}

.guide-header h2 {
    font-size: 14px;
    font-weight: 600;
}

#guide-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 22px;
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
}

#guide-close:hover {
    color: var(--text-primary);
}

.guide-content details {
    border-bottom: 1px solid var(--border);
}

.guide-content summary {
    padding: 10px 20px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    user-select: none;
}

.guide-content summary:hover {
    background: var(--bg-tertiary);
}

.guide-body {
    padding: 4px 20px 16px;
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-secondary);
}

.guide-body p {
    margin-bottom: 8px;
}

.guide-body ol, .guide-body ul {
    margin-left: 20px;
    margin-bottom: 8px;
}

.guide-body li {
    margin-bottom: 4px;
}

.guide-body code {
    font-family: var(--font-mono);
    font-size: 11px;
    background: var(--bg-primary);
    padding: 1px 5px;
    border: 1px solid var(--border);
}

.guide-body pre {
    font-family: var(--font-mono);
    font-size: 11px;
    background: var(--bg-primary);
    padding: 10px 14px;
    border: 1px solid var(--border);
    margin-bottom: 8px;
    overflow-x: auto;
    line-height: 1.5;
}

.guide-body kbd {
    font-family: var(--font-mono);
    font-size: 11px;
    background: var(--bg-tertiary);
    padding: 1px 5px;
    border: 1px solid var(--border-light);
}

.guide-body strong {
    color: var(--text-primary);
}

table.guide-paths {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 8px;
}

table.guide-paths td {
    padding: 4px 8px;
    border: 1px solid var(--border);
    font-size: 12px;
    white-space: normal;
    max-width: none;
    overflow: visible;
}

table.guide-paths td:first-child {
    width: 70px;
    font-weight: 500;
    color: var(--text-primary);
}

.guide-footer {
    padding: 14px 20px;
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ---- ACTIVITY CHART (fixed bottom) ---- */

body.chart-visible {
    padding-bottom: 180px;
}

#activity-chart {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 50;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

#activity-chart[hidden] {
    display: none;
}

.chart-inner {
    padding: 0 20px 4px;
}

.chart-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 0;
    font-size: 12px;
    color: var(--text-secondary);
}

.chart-title {
    font-weight: 500;
}

.chart-range {
    font-size: 11px;
    color: var(--text-muted);
    flex: 1;
}

.chart-header button {
    font-size: 11px;
    padding: 2px 10px;
}

.chart-body {
    height: 100px;
}

.chart-bars {
    display: flex;
    align-items: flex-end;
    height: 100%;
    gap: 1px;
    border-bottom: 1px solid var(--border);
}

.chart-bar-col {
    flex: 1;
    display: flex;
    align-items: flex-end;
    height: 100%;
    min-width: 0;
    position: relative;
}

.chart-bar {
    width: 100%;
    background: var(--accent);
    opacity: 0.6;
    position: relative;
}

.chart-bar-col:hover .chart-bar {
    opacity: 1;
}

.chart-bar-col.dimmed .chart-bar {
    background: var(--border-light);
    opacity: 0.45;
}

.chart-bar-col.dimmed:hover .chart-bar {
    opacity: 0.65;
}

.chart-tooltip {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    padding: 4px 8px;
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-primary);
    white-space: nowrap;
    z-index: 60;
    pointer-events: none;
    line-height: 1.4;
    margin-bottom: 4px;
    text-align: center;
}

.chart-bar-col:hover .chart-tooltip {
    display: block;
}

.chart-x-axis {
    position: relative;
    height: 16px;
    margin-top: 2px;
}

.chart-x-axis span {
    position: absolute;
    font-size: 9px;
    font-family: var(--font-mono);
    color: var(--text-muted);
    white-space: nowrap;
    transform: translateX(-50%);
}

/* ---- FOOTER ---- */

#footer {
    padding: 8px 20px;
    text-align: center;
    font-size: 11px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

#footer a {
    color: var(--text-muted);
    text-decoration: none;
}

#footer a:hover {
    color: var(--text-secondary);
}

/* ---- PRINT ---- */

@media print {
    html {
        background: #fff;
        color: #111;
        font-size: 8pt;
    }

    body.chart-visible {
        padding-bottom: 0;
    }

    #header, #drop-zone, #results-toolbar, #column-picker,
    #pagination, #guide-overlay, #header-actions, #toolbar,
    #footer, #activity-chart {
        display: none !important;
    }

    #file-meta {
        background: #fff;
        border-bottom: 2px solid #999;
        padding: 8px 0;
    }

    .file-meta-label {
        color: #666;
    }

    .file-meta-value {
        color: #111;
    }

    #results {
        display: block !important;
    }

    #results[hidden] {
        display: block !important;
    }

    table {
        font-size: 7pt;
    }

    th {
        background: #eee;
        color: #333;
        border-bottom: 2px solid #999;
    }

    td {
        border-bottom: 1px solid #ccc;
        max-width: none;
        white-space: normal;
        word-break: break-all;
    }

    tbody tr:nth-child(odd),
    tbody tr:nth-child(even),
    tbody tr:hover {
        background: transparent;
    }
}