:root {
    color-scheme: light;
    --bg-top: #f7fafb;
    --bg-bottom: #d9e6ec;
    --panel: #ffffff;
    --panel-border: #b4c8d4;
    --panel-shadow: rgba(28, 56, 74, 0.08);
    --text: #10212b;
    --muted: #516875;
    --focus: #0f6d96;
    --control-bg: #f3f7fa;
    --control-border: #abc0cd;
    --code-bg: #f9fcff;
    --code-border: #b0c4d0;
    --highlight: #d6ecff;
    --highlight-strong: #c2e3ff;
}

@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
        --bg-top: #0f2028;
        --bg-bottom: #09161d;
        --panel: #122733;
        --panel-border: #305060;
        --panel-shadow: rgba(0, 0, 0, 0.3);
        --text: #e5f0f5;
        --muted: #9db5c2;
        --focus: #68b4d8;
        --control-bg: #193543;
        --control-border: #3a6172;
        --code-bg: #10232e;
        --code-border: #335767;
        --highlight: #305066;
        --highlight-strong: #3a647d;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    padding: 0;
    font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    padding-bottom: 0.75rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.github-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
    padding: 0.35rem 0.6rem;
    border-radius: 6px;
}

.github-link:hover {
    color: var(--text);
    background: var(--control-bg);
}

h1 {
    margin: 0;
    font-size: 1.6rem;
    letter-spacing: 0.01em;
}

h2 {
    margin: 0 0 0.5rem;
    font-size: 1rem;
    color: var(--text);
}

h3 {
    margin: 0.75rem 0 0.5rem;
    font-size: 0.9rem;
    color: var(--muted);
    font-weight: 600;
}

h4 {
    margin: 0.5rem 0 0.25rem;
    font-size: 0.85rem;
    color: var(--muted);
    font-weight: 600;
}

.layout-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.layout-label {
    font-size: 0.9rem;
    color: var(--muted);
}

.layout-btn {
    padding: 0.35rem 0.8rem;
    border: 1px solid var(--control-border);
    border-radius: 6px;
    background: var(--control-bg);
    color: var(--text);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
}

.layout-btn:hover {
    filter: brightness(1.04);
}

.layout-btn.active {
    background: var(--focus);
    color: white;
    border-color: var(--focus);
}

.container {
    padding: 0 1.25rem 1.25rem;
    display: grid;
    gap: 1rem;
    align-items: start;
}

/* Tabbed layout (default) */
.container.layout-tabbed {
    grid-template-columns: minmax(280px, 1fr) minmax(280px, 1fr) minmax(280px, 1fr);
}

/* Collapsible layout */
.container.layout-collapsible {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
}

.layout-collapsible .editor {
    grid-column: 1;
    grid-row: 1;
}

.layout-collapsible .output {
    grid-column: 2;
    grid-row: 1;
}

.layout-collapsible .debug {
    grid-column: 1 / -1;
    grid-row: 2;
}

.editor,
.output,
.debug {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-width: 0;
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    box-shadow: 0 6px 18px var(--panel-shadow);
    padding: 1rem;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    align-items: center;
}

.controls button {
    margin-right: 0.25rem;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    color: var(--muted);
}

.options label {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    font-size: 0.9rem;
}

button,
select,
input {
    padding: 0.45rem 0.7rem;
    border: 1px solid var(--control-border);
    border-radius: 8px;
    background: var(--control-bg);
    color: var(--text);
}

button {
    cursor: pointer;
    font-weight: 600;
}

button:hover {
    filter: brightness(1.04);
}

button:focus-visible,
select:focus-visible,
input:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 1px;
}

.editor-surface {
    width: 100%;
    min-height: 420px;
    border: 1px solid var(--code-border);
    border-radius: 10px;
    overflow: hidden;
    background: var(--code-bg);
}

.editor-surface .cm-editor {
    height: 420px;
}

.editor-surface .cm-scroller {
    font-family: "Iosevka", "Fira Code", "JetBrains Mono", monospace;
    font-size: 13px;
    line-height: 1.5;
}

.editor-surface .cm-editor.cm-focused {
    outline: 2px solid var(--focus);
    outline-offset: -2px;
}

pre {
    width: 100%;
    margin: 0;
    border: 1px solid var(--code-border);
    border-radius: 10px;
    padding: 0.65rem;
    font-family: "Iosevka", "Fira Code", "JetBrains Mono", monospace;
    font-size: 12px;
    overflow: auto;
    white-space: pre;
    background: var(--code-bg);
    color: var(--text);
}

#ast,
#embedded-ast,
#ir,
#ir-template,
#ir-embedded {
    min-height: 120px;
    max-height: 180px;
}

.ir-node.highlight {
    background-color: var(--highlight-strong);
    border-radius: 4px;
}

.ir-children {
    margin-left: 0.9rem;
}

/* Debug panel components */
.output-header,
.debug-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.icon-btn {
    padding: 0.3rem 0.6rem;
    background: transparent;
    border: 1px solid var(--control-border);
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s;
}

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

/* Debug tabs (for tabbed layout) */
.debug-tabs {
    display: none;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 0.5rem;
}

.layout-tabbed .debug-tabs {
    display: flex;
}

.debug-tab-btn {
    padding: 0.4rem 0.7rem;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--muted);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
}

.debug-tab-btn:hover {
    color: var(--text);
}

.debug-tab-btn.active {
    color: var(--focus);
    border-bottom-color: var(--focus);
}

.debug-tab-content {
    display: none;
}

/* Debug sections (for collapsible layout) */
.debug-sections {
    display: none;
}

.layout-collapsible .debug-sections {
    display: block;
}

.debug-section {
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.debug-section-header {
    padding: 0.6rem 0.9rem;
    background: var(--control-bg);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    user-select: none;
    display: flex;
    align-items: center;
}

.debug-section-header:hover {
    background: var(--highlight);
}

.debug-section-header::before {
    content: "▶";
    display: inline-block;
    margin-right: 0.5rem;
    transition: transform 0.2s;
    font-size: 0.7rem;
}

.debug-section.expanded .debug-section-header::before {
    transform: rotate(90deg);
}

.debug-section-content {
    display: none;
    padding: 0.75rem;
}

.debug-section.expanded .debug-section-content {
    display: block;
}

/* Hide drawer toggle in non-drawer layouts */
.layout-tabbed #drawer-toggle,
.layout-collapsible #drawer-toggle {
    display: none;
}

.layout-drawer #drawer-toggle {
    display: inline-block;
}

/* New debug panel styles */
.empty-state {
    padding: 1rem;
    text-align: center;
    color: var(--muted);
    font-size: 0.9rem;
}

.text-ranges-list,
.nodes-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 400px;
    overflow-y: auto;
}

.text-range-item {
    padding: 0.6rem;
    border: 1px solid var(--code-border);
    border-radius: 6px;
    background: var(--code-bg);
}

.text-range-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.3rem;
    font-size: 0.85rem;
}

.text-range-index {
    font-weight: 600;
    color: var(--text);
}

.text-range-bytes {
    font-family: "Iosevka", "Fira Code", monospace;
    color: var(--muted);
}

.text-range-preview {
    font-family: "Iosevka", "Fira Code", monospace;
    font-size: 0.8rem;
    color: var(--text);
    white-space: pre-wrap;
    word-break: break-all;
}

.byte-inspector-info {
    padding: 0.5rem;
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 6px;
    margin-bottom: 0.75rem;
    font-size: 0.85rem;
}

.byte-table-container {
    max-height: 400px;
    overflow: auto;
    border: 1px solid var(--code-border);
    border-radius: 6px;
}

.byte-table {
    width: 100%;
    border-collapse: collapse;
    font-family: "Iosevka", "Fira Code", monospace;
    font-size: 0.8rem;
}

.byte-table th {
    position: sticky;
    top: 0;
    background: var(--control-bg);
    padding: 0.5rem;
    text-align: left;
    border-bottom: 2px solid var(--panel-border);
    font-weight: 600;
}

.byte-table td {
    padding: 0.4rem 0.5rem;
    border-bottom: 1px solid var(--code-border);
}

.byte-table tr:hover {
    background: var(--highlight);
}

.byte-char {
    font-weight: 600;
}

.node-filters {
    margin-bottom: 0.75rem;
    padding: 0.75rem;
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 6px;
}

.filter-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.85rem;
}

.filter-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.filter-checkbox {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.8rem;
    cursor: pointer;
}

.filter-checkbox input {
    cursor: pointer;
}

.node-item {
    padding: 0.6rem;
    border: 1px solid var(--code-border);
    border-radius: 6px;
    background: var(--code-bg);
    font-family: "Iosevka", "Fira Code", monospace;
    font-size: 0.8rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.node-type {
    font-weight: 700;
    color: var(--text);
}

.node-range,
.node-width {
    color: var(--muted);
    font-size: 0.75rem;
}

.node-origin {
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
}

.origin-template {
    background: #d6ecff;
    color: #0a4d6e;
}

@media (prefers-color-scheme: dark) {
    .origin-template {
        background: #1a4a5e;
        color: #a8d8f0;
    }
}

.origin-embedded {
    background: #e8d6ff;
    color: #4a0a6e;
}

@media (prefers-color-scheme: dark) {
    .origin-embedded {
        background: #3a1a5e;
        color: #d8a8f0;
    }
}

.node-value {
    width: 100%;
    margin-top: 0.25rem;
    padding-top: 0.4rem;
    border-top: 1px solid var(--code-border);
    color: var(--text);
    white-space: pre-wrap;
    word-break: break-all;
}

.merge-order {
    background: var(--highlight);
    padding: 0.15rem 0.35rem;
    border-radius: 3px;
    font-size: 0.7rem;
    font-weight: 600;
}

.keyboard-shortcuts {
    padding: 0.75rem 1.25rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--muted);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.shortcuts-label {
    font-weight: 600;
}

.keyboard-shortcuts kbd {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 4px;
    font-family: "Iosevka", "Fira Code", monospace;
    font-size: 0.75rem;
    font-weight: 600;
}

.keyboard-shortcuts .divider {
    color: var(--panel-border);
}

@media (max-width: 1200px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .header-actions {
        width: 100%;
        justify-content: space-between;
    }

    .container.layout-tabbed,
    .container.layout-collapsible {
        grid-template-columns: 1fr;
    }

    .layout-collapsible .editor,
    .layout-collapsible .output,
    .layout-collapsible .debug {
        grid-column: 1;
    }

    .layout-collapsible .editor {
        grid-row: 1;
    }

    .layout-collapsible .output {
        grid-row: 2;
    }

    .layout-collapsible .debug {
        grid-row: 3;
    }

    .editor-surface,
    .editor-surface .cm-editor {
        min-height: 340px;
        height: 340px;
    }
}