:root {
    --bg: #0b1220;
    /* main background */
    --panel: #111827;
    /* panels/cards */
    --panel-2: #0f172a;
    /* inner areas */
    --muted: #9aa4b2;
    /* secondary texts */
    --text: #e5e7eb;
    /* texts */
    --accent: #60a5fa;
    /* main accent */
    --accent-2: #34d399;
    /* success */
    --danger: #f87171;
    /* error */
    --border: #1f2937;
    /* border */
    --shadow: rgba(0, 0, 0, .35);
    --btn: #1f2937;
    /* button base */
    --btn-hover: #334155;
    /* hover */
    --gutter: #0b1426;
    --hl: #1e3a8a33;
    /* search highlight */
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    overflow-x: hidden;
    /* prevents global lateral overflow */
    overflow-y: auto;
    /* allows scrolling if needed */
}

/* General layout */
.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    width: 100%;
}

.app-header {
    flex: 0 0 auto;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--gradient-app-header);
    box-shadow: 0 6px 20px var(--shadow);
}

.title {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 1rem;
}

.title h1 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0;
}

.title small {
    color: var(--muted);
    display: block;
    margin-top: 2px;
}

.toolbar {
    flex: 0 0 auto;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
    padding: 0.5rem;
    border: 1px solid var(--border);
    background: var(--panel);
    border-radius: 1rem;
}

.toolbar .field {
    display: flex;
    align-items: center;
    gap: 5px;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.5rem;
    cursor: pointer;
}

.toolbar input[type="text"],
.toolbar input[type="number"],
.toolbar select {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text);
    max-width: 60vw;
}

.toolbar input[type="number"] {
    width: 6rem;
}

#replaceQuery, #searchQuery {
    width: 7rem;
}

.panel-actions .field {
    display: flex;
    align-items: center;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.3rem;
    color: #fff;
}

.btn {
    background: var(--btn);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 0.5rem;
    border-radius: 10px;
    cursor: pointer;
    transition: .18s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn:hover {
    background: var(--btn-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 20px var(--shadow);
}

.btn.primary {
    background: linear-gradient(135deg, #3b82f6, #60a5fa);
    border-color: #3b82f6;
    color: #0b1220;
    font-weight: 700;
}

.btn.success {
    background: linear-gradient(135deg, #10b981, #34d399);
    border-color: #10b981;
    color: #06261d;
    font-weight: 700;
}

.app-main {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

#url-fetch {
    min-width: 35%;
    max-width: 50%;
    flex: 1;
}

#url {
    flex: 1;
    min-width: 20%;
}

#btnFetch {
    white-space: nowrap;
}

#btnDownload{
    padding: 0.3rem;
}
#exportExt{
    padding: 0;
}
/* IMPORTANT: minmax(0,1fr) prevents layout from "pushing" when wrap is on */
.grid {
    flex: 1 1 auto;
    min-height: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 1rem;
    padding: 1rem 0.3rem
}

@media (max-width: 1000px) {
    .grid {
    grid-template-columns: minmax(0, 1fr);
    }
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 5px;
    display: flex;
    flex-direction: column;
    min-height: 0;
    min-width: 0;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    gap: 5px;
}

.panel-title {
    font-weight: 700;
    color: #cbd5e1;
    display: flex;
    align-items: center;
    gap: 5px;
}

.panel-actions {
    display: flex;
    align-items: center;
    gap: 5px;
    flex-wrap: wrap;
}

.editor-wrap {
    flex: 1 1 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

input, select, label {
    margin-bottom: 0;
    width: auto;
    padding: 0.5rem;
}

/* INPUT editor with gutter */
.input-view {
    flex: 1 1 0;
    min-height: 0;
    display: flex;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    background: var(--panel-2);
    min-width: 0;
}

.gutter-input {
    background: var(--gutter);
    color: #93a4bb;
    text-align: right;
    padding: 8px 8px 8px 4px;
    overflow: hidden;
    user-select: none;
    border-right: 1px solid var(--border);
    min-width: 45px;
}

.gutter-input span {
    display: block;
    line-height: 1.6;
}

.gutter-input span.cont {
    color: #6b7a90;
    opacity: .7;
}

textarea#input {
    flex: 1 1 0;
    min-height: 0;
    resize: none;
    width: 100%;
    background: transparent;
    color: var(--text);
    border: none;
    padding: 8px 12px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-size: 16px;
    line-height: 1.6;
    overflow: auto;
    min-width: 0;
    /* prevents lateral overflow when wrap is off */
}

/* OUTPUT viewer with gutter and folding */
.viewer {
    flex: 1 1 0;
    min-height: 0;
    display: flex;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    background: var(--panel-2);
    min-width: 0;
    position: relative;  /* For absolute positioned copy button */
}

/* Copy button inside output viewer */
.copy-output-btn {
    position: absolute;
    top: 0.7rem;
    right: 0.7rem;
    background: var(--accent);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.8em;
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s ease;
    z-index: 10;
    font-weight: 500;
}

.viewer:hover .copy-output-btn {
    opacity: 1;
}

.copy-output-btn:hover {
    background: #3b82f6;  /* Slightly brighter blue */
    transform: translateY(-1px);
}

.copy-output-btn.copied {
    background: var(--accent-2);  /* Success green */
}

.gutter {
    background: var(--gutter);
    color: #93a4bb;
    text-align: right;
    padding: 8px 10px 8px 4px;
    overflow-y: hidden;
    overflow-x: hidden;
    user-select: none;
    border-right: 1px solid var(--border);
    font-size: 14px;
    min-width: 50px;
    flex-shrink: 0;
}

.gutter.wrap-off::after {
    content: '';
    display: block;
    height: 17px; /* Reserve space for horizontal scrollbar */
    width: 100%;
}

.gutter span {
    display: block;
    line-height: 1.6;
}

.gutter span.fold-indicator {
    color: #6b7a90;
    opacity: 0.7;
    font-size: 0.9em;
}

.code {
    flex: 1 1 auto;
    overflow-y: auto;
    overflow-x: auto;
    padding: 6px 8px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-size: 14px;
    line-height: 1.6;
    color: #dde7f7;
    min-width: 0;
}

.code.wrap-on {
    overflow-x: hidden;
}

.code-line {
    display: flex;
    padding: 0 6px;
}

.code.wrap-on .code-line {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    word-break: break-word;
}

.code.wrap-off .code-line {
    white-space: pre;
    overflow-wrap: normal;
}

.children {
    margin-left: 16px;
}

.fold-toggle {
    cursor: pointer;
    color: #93c5fd;
    margin-right: 6px;
    user-select: none;
}

.line-highlight {
    background: var(--hl);
    border-radius: 6px;
}

/* Syntax tokens */
.tok-pi {
    color: #a5b4fc;
}

.tok-comment {
    color: #94a3b8;
    font-style: italic;
}

.tok-cdata {
    color: #facc15;
}

.tok-tag {
    color: #93c5fd;
}

.tok-ns {
    color: #60a5fa;
}

.tok-name {
    color: #bfdbfe;
}

.tok-attr {
    color: #f9a8d4;
}

.tok-eq {
    color: #e5e7eb;
}

.tok-val {
    color: #86efac;
}

.tok-text {
    color: #e5e7eb;
}

.stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    color: #9ca3af;
    font-size: 12px;
    padding: 0 2px;
}

.footer {
    flex: 0 0 auto;
    border-top: 1px solid var(--border);
    padding: 8px 18px;
    color: #9ca3af;
    font-size: 12px;
}

.file-label {
    position: relative;
    overflow: hidden;
    transition: .18s;
}

.file-label:hover {
    background: var(--btn-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 20px var(--shadow);
}

.file-label input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    z-index: -10;
}

.toasts {
    position: fixed;
    right: 16px;
    bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 9999;
}

.toast {
    background: #0b1426;
    color: #dbeafe;
    border: 1px solid #1e3a8a;
    padding: 10px 12px;
    border-radius: 10px;
    box-shadow: 0 10px 30px var(--shadow);
    opacity: 0;
    transform: translateY(8px);
    animation: show .25s forwards;
}

.toast.ok {
    border-color: #065f46;
    color: #d1fae5;
}

.toast.err {
    border-color: #7f1d1d;
    color: #fee2e2;
}

@keyframes show {
    to {
    opacity: 1;
    transform: translateY(0);
    }
}

/* Advanced options dropdown */
details.adv {
    display: contents;
}

details.adv>summary {
    list-style: none;
    cursor: pointer;
}

details.adv>summary::-webkit-details-marker {
    display: none;
}

details.adv>summary.btn::after {
    content: '▼';
    margin-left: 6px;
    font-size: 10px;
    opacity: .7;
}

details.adv[open]>summary.btn::after {
    content: '▲';
}

.adv-content {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px;
}


/* ─── XML Tree viewer (xmlview-inspired) ─────────────────────────────────── */
.xv-source-pane {
    max-height: 480px;
    overflow: auto;
    padding: 10px 14px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 12.5px;
    line-height: 1.7;
    background: var(--panel-2);
    color: var(--text);
}

.xv-node { position: relative; }

.xv-tag-line {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0;
    white-space: pre;
}

.xv-toggler {
    cursor: pointer;
    color: var(--muted);
    font-size: 10px;
    min-width: 14px;
    user-select: none;
    padding-right: 2px;
    transition: color 0.1s;
}

.xv-toggler:hover { color: var(--accent); }

.xv-spacer { min-width: 14px; display: inline-block; }

/* Tag colors — xmlview palette adapted to dark theme */
.xv-bracket    { color: #5fafef; }          /* <  >  />  </  */
.xv-tag-name   { color: #7ec8e3; font-weight: 500; } /* localName */
.xv-tag-ns     { color: #4a9bc4; }          /* ns: prefix */
.xv-tag-compound { display: inline; }

/* Attributes */
.xv-attr       { display: inline; }
.xv-attr-name  { color: #9bd98b; }          /* attribute name */
.xv-attr-xmlns { color: #7c7c9c; }          /* xmlns declarations — muted */
.xv-eq         { color: var(--muted); }
.xv-attr-value { color: #e8b86d; }          /* "value" */

/* Content */
.xv-text        { color: var(--text); }
.xv-text-inline { color: var(--text); padding: 0 2px; }
.xv-comment     { color: #6a6a7a; font-style: italic; }
.xv-cdata       { color: #a0c8ff; font-weight: bold; }
.xv-pi          { color: #888; }

/* Collapse/expand */
.xv-children { padding-left: 20px; border-left: 1px solid #1f2937; margin-left: 6px; }

.xv-node:hover > .xv-tag-line { background: rgba(255,255,255,0.03); border-radius: 3px; }

/* Tabs */
.xv-panel-tabs {
    display: flex;
    gap: 4px;
}

.xv-tab {
    padding: 4px 12px;
    font-size: 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    transition: all 0.15s;
}

.xv-tab:hover { color: var(--text); border-color: var(--accent); }
.xv-tab.active {
    background: rgba(96,165,250,0.12);
    border-color: var(--accent);
    color: var(--accent);
    font-weight: 500;
}

/* ─── Tool panels (XPath + JSON) ─────────────────────────────────────────── */
.tool-panel {
    margin: 0 12px 12px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
}

.tool-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    background: var(--panel-2);
    border-bottom: 1px solid var(--border);
    gap: 8px;
    flex-wrap: wrap;
}

.tool-panel-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 6px;
}

.tool-panel-actions {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}

.tool-badge {
    font-size: 11px;
    background: rgba(96, 165, 250, 0.15);
    color: var(--accent);
    padding: 2px 7px;
    border-radius: 10px;
}

/* XPath results */
.xpath-results {
    max-height: 280px;
    overflow-y: auto;
    padding: 6px 0;
}

.xpath-result-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 6px 12px;
    border-bottom: 1px solid var(--border);
    font-size: 12px;
    transition: background 0.1s;
}

.xpath-result-item:last-child { border-bottom: none; }
.xpath-result-item:hover { background: rgba(255,255,255,0.03); }

.xpath-result-idx {
    min-width: 28px;
    color: var(--muted);
    font-size: 11px;
    padding-top: 1px;
    font-family: monospace;
}

.xpath-result-content { flex: 1; min-width: 0; }

.xpath-result-tag {
    font-family: 'SF Mono', 'Fira Code', monospace;
    color: var(--accent);
    font-size: 12px;
    font-weight: 500;
}

.xpath-result-path {
    font-size: 10.5px;
    color: var(--muted);
    margin-top: 1px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.xpath-result-text {
    font-size: 11px;
    color: var(--text);
    margin-top: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    opacity: 0.8;
}

.xpath-result-attrs {
    font-size: 10.5px;
    color: var(--muted);
    margin-top: 2px;
    font-family: monospace;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.xpath-jump-btn {
    padding: 2px 8px;
    font-size: 11px;
    background: rgba(96,165,250,0.1);
    border: 1px solid rgba(96,165,250,0.25);
    border-radius: 4px;
    color: var(--accent);
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
}

.xpath-jump-btn:hover { background: rgba(96,165,250,0.2); }

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

.xpath-error {
    padding: 12px;
    color: var(--danger);
    font-size: 12px;
    font-family: monospace;
}

/* JSON output */
.json-output {
    margin: 0;
    padding: 12px;
    max-height: 400px;
    overflow: auto;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 12px;
    line-height: 1.6;
    color: var(--text);
    background: transparent;
    white-space: pre;
}

/* JSON syntax highlighting */
.json-key   { color: #60a5fa; }
.json-str   { color: #34d399; }
.json-num   { color: #fbbf24; }
.json-bool  { color: #f472b6; }
.json-null  { color: var(--muted); }

/* Node highlight from XPath jump */
.code-line.xpath-highlight {
    background: rgba(96, 165, 250, 0.12) !important;
    outline: 1px solid rgba(96, 165, 250, 0.35);
    border-radius: 2px;
}

@media (max-width: 768px) {
    #url-fetch {
        min-width: auto;
        max-width: 100%;
        flex: 1 1 100%;
    }

    #url {
        flex: 1 1 auto;
        min-width: 0;
    }

    #btnFetch {
        flex-shrink: 0;
        margin-left: auto;
    }
}