*, *::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;
    --warn: #c9a24d;
    --ok: #7ba86a;
    --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;
    min-width: 0;
}

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

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

.meta-file {
    padding: 2px 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 11px;
    max-width: 40vw;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.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 TOOLBAR ---- */

#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;
}

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

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

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

#batch-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;
}

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

.tz-inline {
    display: inline-block;
}

.batch-count {
    font-weight: 600;
    color: var(--text-primary);
}

.section-note-inline {
    font-size: 11px;
    color: var(--text-muted);
    margin-left: 8px;
}

#batch-area {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 20px 40px;
    overflow-x: auto;
}

.batch-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
}

.batch-table th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 10px;
    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;
}

.batch-table th.sortable {
    cursor: pointer;
    user-select: none;
}

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

.batch-table td {
    padding: 5px 10px;
    border-bottom: 1px solid var(--bg-tertiary);
    vertical-align: top;
    overflow-wrap: anywhere;
}

.batch-table .num-col {
    width: 30px;
    color: var(--text-muted);
}

tr.batch-row {
    cursor: pointer;
}

tr.batch-row:hover {
    background: var(--bg-hover);
}

tr.batch-row-error {
    cursor: default;
}

.batch-error {
    color: var(--error);
}

/* ---- CONTENT SECTIONS ---- */

#content-area {
    max-width: 1100px;
    margin: 0 auto;
    padding: 16px 20px 40px;
    overflow-wrap: anywhere;
}

details.result-section {
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    margin-bottom: 12px;
}

details.result-section > summary {
    padding: 10px 16px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    user-select: none;
    list-style-position: inside;
}

details.result-section > summary:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

details.result-section[open] > summary {
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

.section-body {
    padding: 12px 16px;
}

.section-note {
    font-size: 12px;
    color: var(--text-muted);
    padding: 4px 0;
}

.detail-row {
    display: flex;
    gap: 16px;
    padding: 5px 0;
    border-bottom: 1px solid var(--bg-tertiary);
    font-size: 12px;
}

.detail-row:last-child {
    border-bottom: none;
}

.detail-label {
    flex: 0 0 200px;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    font-size: 11px;
    padding-top: 1px;
}

.detail-value {
    color: var(--text-primary);
    word-break: break-all;
    min-width: 0;
}

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

.row-highlight .detail-value {
    color: var(--accent-hover);
}

.value-muted {
    color: var(--text-muted);
}

.help-tip {
    display: inline-block;
    width: 14px;
    height: 14px;
    line-height: 14px;
    margin-left: 4px;
    border-radius: 50%;
    border: 1px solid var(--text-muted);
    color: var(--text-muted);
    font-size: 10px;
    font-weight: 600;
    text-align: center;
    cursor: help;
    user-select: none;
    vertical-align: middle;
}

.help-tip:hover {
    border-color: var(--accent-hover);
    color: var(--accent-hover);
}

.help-tip-popup {
    position: fixed;
    z-index: 1000;
    max-width: 320px;
    padding: 8px 10px;
    background: var(--bg-secondary, #1e242c);
    color: var(--text-primary, #d7dde5);
    border: 1px solid var(--border, #3a424d);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 400;
    line-height: 1.45;
    text-align: left;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
    pointer-events: none;
}

.value-warn {
    color: var(--warn);
}

.value-ok {
    color: var(--ok);
    font-size: 11px;
}

.raw-note {
    color: var(--text-muted);
    font-size: 10px;
    margin-left: 6px;
}

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

.ctrl-char {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--error);
    background: rgba(204, 102, 102, 0.12);
    padding: 0 2px;
}

/* ---- BADGES ---- */

.badge {
    display: inline-block;
    padding: 1px 8px;
    margin: 1px 4px 1px 0;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-primary);
    white-space: nowrap;
}

.badge-attr {
    border-color: var(--border);
    color: var(--text-secondary);
}

.badge-empty {
    color: var(--text-muted);
    border-color: var(--border);
}

.badge-observation {
    border-color: var(--warn);
    color: var(--warn);
    background: rgba(201, 162, 77, 0.08);
}

.badge-clean {
    border-color: var(--ok);
    color: var(--ok);
    background: rgba(123, 168, 106, 0.08);
}

/* ---- NOTABLE OBSERVATIONS ---- */

.observations-banner {
    border: 1px solid var(--warn);
    background: rgba(201, 162, 77, 0.06);
    padding: 12px 16px;
    margin-bottom: 12px;
}

.observations-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--warn);
    margin-bottom: 4px;
}

.observations-note {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.observation-item {
    display: flex;
    gap: 10px;
    align-items: baseline;
    padding: 4px 0;
    font-size: 12px;
}

.observation-item .badge {
    flex-shrink: 0;
}

.observation-detail {
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ---- SUB TABLES (ID list items) ---- */

.sub-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
    margin-top: 8px;
}

.sub-table th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    text-align: left;
    padding: 5px 10px;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

.sub-table td {
    padding: 4px 10px;
    border-bottom: 1px solid var(--bg-tertiary);
    word-break: break-all;
    vertical-align: top;
}

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


.sub-table td.raw-cell {
    max-width: 320px;
    color: var(--text-muted);
    font-size: 10px;
}

/* ---- EXTRA DATA BLOCKS ---- */

.extra-block {
    border: 1px solid var(--border);
    background: var(--bg-primary);
    padding: 10px 14px;
    margin-bottom: 10px;
}

.extra-block:last-child {
    margin-bottom: 0;
}

.extra-block-unknown {
    border-color: var(--warn);
}

.extra-block-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

/* ---- WARNINGS ---- */

.warning-list {
    margin-left: 20px;
    font-size: 12px;
    color: var(--warn);
    line-height: 1.7;
}

/* ---- HEX DUMP ---- */

.hex-dump {
    position: relative;
    font-family: var(--font-mono);
    font-size: 11px;
    line-height: 1.5;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    padding: 10px 14px;
    overflow: auto;
    max-height: 60vh;
    white-space: nowrap;
}

.hex-row {
    display: flex;
    gap: 16px;
}

.hex-offset {
    color: var(--text-muted);
    flex-shrink: 0;
}

.hex-bytes {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.hex-ascii {
    color: var(--text-primary);
    flex-shrink: 0;
}

.hx-header,     .hex-chip.hx-header:hover     { background: rgba(106, 159, 181, 0.22); }
.hx-idlist,     .hex-chip.hx-idlist:hover     { background: rgba(123, 168, 106, 0.20); }
.hx-linkinfo,   .hex-chip.hx-linkinfo:hover   { background: rgba(160, 130, 190, 0.20); }
.hx-stringdata, .hex-chip.hx-stringdata:hover { background: rgba(201, 162, 77, 0.18); }
.hx-extradata,  .hex-chip.hx-extradata:hover  { background: rgba(198, 102, 102, 0.18); }
.hx-trailing,   .hex-chip.hx-trailing:hover   { background: rgba(160, 160, 160, 0.22); }

.hex-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
}

.hex-chip {
    font-family: var(--font-mono);
    font-size: 10px;
    padding: 3px 8px;
    border: 1px solid var(--border);
    color: var(--text-primary);
    cursor: pointer;
}

.hex-chip:hover {
    border-color: var(--border-light);
}

.hex-chip.active {
    border-color: var(--text-secondary);
}

.hex-chip-range {
    color: var(--text-muted);
    margin-left: 4px;
}

/* ---- 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 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: 100px;
    font-weight: 500;
    color: var(--text-primary);
}

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

/* ---- 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);
}

/* ---- RESPONSIVE ---- */

@media (max-width: 640px) {
    .detail-row {
        flex-direction: column;
        gap: 2px;
    }

    .detail-label {
        flex-basis: auto;
    }
}