:root {
    --bg: #ffffff;
    --text: #000000;
    --accent: #2563eb;
    --border: #000000;
    --card-bg: #ffffff;
    --pane-bg: #f8fafc;
    --shadow: 4px 4px 0px 0px #000000;
    --shadow-hover: 8px 8px 0px 0px #000000;
    --color-primary: #2563eb;
    --color-destructive: #ef4444;
}

[data-theme="dark"] {
    --bg: #0f172a;
    --text: #f8fafc;
    --accent: #38bdf8;
    --border: #f8fafc;
    --card-bg: #1e293b;
    --pane-bg: #0f172a;
    --shadow: 4px 4px 0px 0px #f8fafc;
    --shadow-hover: 8px 8px 0px 0px #f8fafc;
    --color-primary: #38bdf8;
    --color-destructive: #f87171;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* Header & Navigation */
header {
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 4px solid var(--border);
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 1000;
}

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

/* Language Dropdown */
.lang-dropdown {
    position: relative;
    display: inline-block;
}

.lang-dropbtn {
    padding: 0.6rem 1.2rem;
    background: var(--card-bg);
    border: 3px solid var(--border);
    cursor: pointer;
    font-weight: 800;
    color: var(--text);
    box-shadow: 3px 3px 0px 0px var(--border);
    transition: 0.2s;
    text-transform: uppercase;
    font-size: 0.8rem;
}

.lang-dropdown:hover .lang-dropbtn {
    transform: translate(-2px, -2px);
    box-shadow: 5px 5px 0px 0px var(--border);
}

.lang-dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: var(--card-bg);
    min-width: 200px;
    box-shadow: var(--shadow);
    border: 3px solid var(--border);
    z-index: 1;
    max-height: 400px;
    overflow-y: auto;
}

.lang-dropdown-content a {
    color: var(--text);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    font-weight: 700;
    border-bottom: 2px solid var(--border);
    font-size: 0.85rem;
}

.lang-dropdown-content a:last-child {
    border-bottom: none;
}

.lang-dropdown-content a:hover {
    background-color: var(--accent);
    color: #fff;
}

.lang-dropdown:hover .lang-dropdown-content {
    display: block;
}

.logo-link {
    text-decoration: none;
    color: var(--text);
}

.logo {
    font-size: 2rem;
    font-weight: 900;
    /* Remove text-transform to allow mixed case/fonts */
    letter-spacing: -1px;
    cursor: pointer;
    display: flex;
    align-items: baseline;
}

.logo-net {
    color: var(--text);
}

.logo-nest {
    color: var(--accent);
}

.logo-lab {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 400;
    color: var(--text);
    opacity: 0.9;
    font-size: 1.8rem;
    /* Slightly smaller for balance */
    margin-left: 2px;
}

.theme-toggle {
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border: 3px solid var(--border);
    cursor: pointer;
    font-weight: 700;
    box-shadow: var(--shadow);
    transition: 0.2s;
    color: var(--text);
}

.theme-toggle:hover {
    transform: translate(-2px, -2px);
    box-shadow: var(--shadow-hover);
}

/* Homepage Hero */
.hero {
    text-align: center;
    padding: 6rem 5%;
    background: var(--pane-bg);
    border-bottom: 4px solid var(--border);
}

.hero h1 {
    font-size: 4rem;
    font-weight: 900;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    line-height: 1;
}

.hero p {
    font-size: 1.5rem;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.9;
}

/* Tool Grid */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2.5rem;
    padding: 6rem 5%;
}

.tool-card {
    background: var(--card-bg);
    border: 4px solid var(--border);
    padding: 2rem;
    text-decoration: none;
    color: var(--text);
    box-shadow: var(--shadow);
    transition: 0.2s;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
    overflow: hidden;
}

.tool-accent-bar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
}

.tool-card:hover {
    transform: translate(-4px, -4px);
    box-shadow: 8px 8px 0px 0px var(--tool-accent, var(--border));
    background: var(--pane-bg);
}

.tool-card h3 {
    font-size: 1.75rem;
    font-weight: 900;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.tool-card p {
    font-size: 1.05rem;
    margin-bottom: 2rem;
    flex-grow: 1;
    opacity: 0.8;
}

.tool-card .badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: var(--accent);
    color: #fff;
    font-weight: 900;
    font-size: 0.85rem;
    align-self: flex-start;
    text-transform: uppercase;
}

/* Main Container (Editor Mode) */
main {
    padding: 1rem 5%;
}

.editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 1rem;
    height: 82vh;
}

.tool-info {
    display: flex;
    align-items: baseline;
    gap: 1rem;
}

.tool-name {
    font-weight: 900;
    text-transform: uppercase;
    font-size: 1.1rem;
    letter-spacing: 0.05em;
    color: var(--text);
    white-space: nowrap;
}

.tool-desc-meta {
    font-size: 0.8rem;
    opacity: 0.7;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pane {
    display: flex;
    flex-direction: column;
    border: 4px solid var(--border);
    background: var(--card-bg);
    box-shadow: var(--shadow);
}

.pane-header {
    background: var(--card-bg);
    padding: 0.8rem 1.2rem;
    border-bottom: 3px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.pane-title {
    font-weight: 900;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    color: var(--text);
}

.control-zone {
    display: flex;
    gap: 0.8rem;
    align-items: center;
}

.query-input {
    padding: 0.4rem 0.8rem;
    border: 3px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    width: 200px;
}

/* Tree View Styling */
.tree-container {
    padding: 1.5rem 0.5rem 1.5rem 1.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    overflow: auto;
    height: 100%;
}

.tree-node {
    margin-left: 1.5rem;
    position: relative;
    padding: 0.2rem 0;
}

.tree-toggle {
    cursor: pointer;
    font-weight: bold;
    color: var(--accent);
    margin-right: 8px;
    user-select: none;
}

.tree-key {
    color: var(--text);
    font-weight: 700;
}

.tree-val-str {
    color: #22863a;
}

.tree-val-num {
    color: #005cc5;
}

.tree-val-bool {
    color: #d73a49;
}

[data-theme="dark"] .tree-val-str {
    color: #7ee787;
}

[data-theme="dark"] .tree-val-num {
    color: #79c0ff;
}

[data-theme="dark"] .tree-val-bool {
    color: #ffa198;
}

/* Device Selector */
.device-btn {
    padding: 0.4rem;
    border: 2px solid var(--border);
    background: var(--card-bg);
    cursor: pointer;
    line-height: 0;
}

.device-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* Vertical Toolbar Layout */
.vertical-toolbar {
    width: 100%;
    background: var(--pane-bg);
    border-top: 3px solid var(--border);
    border-bottom: 3px solid var(--border);
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    padding: 10px;
    gap: 15px;
    z-index: 10;
    flex-wrap: wrap;
}

@media (min-width: 900px) {
    .vertical-toolbar {
        width: 60px;
        height: 100%;
        flex-direction: column;
        border-top: none;
        border-bottom: none;
        border-left: 3px solid var(--border);
        border-right: 3px solid var(--border);
        padding: 10px 0;
        gap: 10px;
    }
}

.v-toolbar-btn {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text);
    transition: all 0.2s ease;
    position: relative;
}

.v-toolbar-btn svg {
    width: 20px;
    height: 20px;
    stroke-width: 2px;
}

.v-toolbar-btn:hover {
    background: var(--border);
    color: var(--bg);
}

.v-toolbar-btn.active {
    background: var(--accent);
    color: #fff;
}

.v-toolbar-btn-run {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

@media (min-width: 900px) {
    .v-toolbar-btn-run {
        margin-top: auto;
    }
}

/* Tooltip for vertical buttons */
.v-toolbar-btn::after {
    content: attr(title);
    position: absolute;
    left: 110%;
    top: 50%;
    transform: translateY(-50%);
    background: #000;
    color: #fff;
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
    z-index: 20;
}

.v-toolbar-btn:hover::after {
    opacity: 1;
}

@media (max-width: 899px) {
    .v-toolbar-btn::after {
        left: 50%;
        bottom: 120%;
        top: auto;
        transform: translateX(-50%);
    }
}

#html-editor {
    flex-grow: 1;
    width: 100%;
    padding: 1.5rem 1rem 1.5rem 0.5rem;
    border: none;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 1.15rem;
    background: var(--card-bg);
    color: var(--text);
    resize: none;
    outline: none;
}

#preview-frame {
    flex-grow: 1;
    border: none;
    background: #ffffff;
}

/* Preview Content (Markdown/BBCode) */
.preview-content {
    flex-grow: 1;
    padding: 1.5rem 0.5rem 1.5rem 1.5rem;
    overflow-y: auto;
    background: #fff;
    color: #000;
}

.preview-content h1,
.preview-content h2,
.preview-content h3 {
    margin: 1.5rem 0 1rem 0;
    border-bottom: 2px solid #eee;
    padding-bottom: 0.3rem;
}

.preview-content p {
    margin-bottom: 1rem;
}

/* Content Section (EEAT) */
.content-section {
    max-width: 1000px;
    margin: 6rem auto;
    padding: 4rem;
    background: var(--card-bg);
    border: 6px solid var(--border);
    box-shadow: var(--shadow);
}

.content-section h2 {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 2rem;
    text-transform: uppercase;
    line-height: 1.1;
}

.content-section h3 {
    font-size: 1.75rem;
    font-weight: 900;
    margin: 2.5rem 0 1rem 0;
}

.content-section p {
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
    opacity: 0.9;
}

.content-section ul {
    margin-bottom: 2rem;
    padding-left: 2rem;
}

.content-section li {
    margin-bottom: 0.75rem;
    font-size: 1.15rem;
}

/* Language Switcher */
.language-switcher {
    margin-top: 6rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
    padding: 0 5%;
}

.lang-link {
    padding: 0.75rem 2rem;
    background: var(--card-bg);
    border: 4px solid var(--border);
    text-decoration: none;
    color: var(--text);
    font-weight: 900;
    box-shadow: 4px 4px 0px 0px var(--border);
    transition: 0.2s;
    text-transform: uppercase;
    font-size: 0.9rem;
}

.lang-link:hover {
    transform: translate(-3px, -3px);
    box-shadow: 7px 7px 0px 0px var(--border);
    background: var(--accent);
    color: #fff;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
}

.modal-content {
    position: relative;
    width: 95%;
    height: 95%;
    margin: 1.25% auto;
    background: #fff;
    border: 8px solid var(--border);
}

.modal-header {
    background: var(--border);
    color: #fff;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 900;
    text-transform: uppercase;
}

.modal-close {
    background: #ef4444;
    color: #fff;
    border: 4px solid #fff;
    padding: 0.5rem 1.5rem;
    font-weight: 900;
    cursor: pointer;
    text-transform: uppercase;
}

.preview-full-frame {
    width: 100%;
    height: calc(100% - 80px);
    border: none;
}

/* CSV Table View */
.csv-table-container {
    padding: 1.5rem 0.5rem 1.5rem 1.5rem;
    overflow: auto;
    height: 100%;
    background: #fff;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    color: #000;
}

th,
td {
    border: 2px solid #000;
    padding: 1rem;
    text-align: left;
    font-size: 1rem;
}

th {
    background: #e2e8f0;
    font-weight: 900;
    text-transform: uppercase;
}

/* Footer */
footer {
    text-align: center;
    padding: 1.5rem 5%;
    border-top: 4px solid var(--border);
    font-weight: 800;
    background: var(--pane-bg);
}

footer p {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

@media (min-width: 900px) {
    .editor-container {
        display: flex;
        flex-direction: row;
        height: 80vh;
        gap: 0;
        /* Gap handled by toolbar padding */
    }

    .pane {
        flex: 1;
        width: 0;
        min-width: 0;
    }

    .pane:first-child {
        border-right: none;
        border-bottom: none;
    }
}

@media (max-width: 1024px) {
    .editor-container {
        grid-template-columns: 1fr;
        height: auto;
    }

    #html-editor {
        height: 400px;
    }

    #preview-frame,
    .preview-content,
    .csv-table-container {
        height: 400px;
    }

    .hero h1 {
        font-size: 3rem;
    }
}

/* Semantic Content Network Styling */
.semantic-block {
    margin-bottom: 3.5rem;
    padding: 2.5rem;
    background: var(--card-bg);
    border: 4px solid var(--border);
    box-shadow: var(--shadow-hover);
}

.semantic-block h2 {
    font-size: 2.2rem;
    font-weight: 900;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    border-bottom: 4px solid var(--accent);
    display: inline-block;
}

.semantic-block h3 {
    font-size: 1.6rem;
    font-weight: 900;
    margin-bottom: 1.25rem;
    text-transform: uppercase;
}

.eav-list {
    list-style: none;
    padding: 0;
}

.eav-list li {
    margin-bottom: 1.25rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 1.1rem;
}

.eav-list li::before {
    content: "?";
    font-weight: 900;
    color: var(--accent);
    background: var(--border);
    color: #fff;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.8rem;
}

.spec-table-container {
    overflow-x: auto;
    margin: 2rem 0;
    border: 4px solid var(--border);
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
}

.spec-table th,
.spec-table td {
    padding: 1.25rem;
    text-align: left;
    border: 2px solid var(--border);
}

.spec-table th {
    background: var(--border);
    color: #fff;
    text-transform: uppercase;
    font-weight: 900;
    letter-spacing: 0.05em;
}

.faq-item {
    margin-bottom: 1rem;
    border: 3px solid var(--border);
    transition: 0.3s;
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background: var(--card-bg);
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    text-align: left;
    gap: 1rem;
}

.faq-question h4 {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 900;
    text-transform: uppercase;
    color: var(--text);
}

.faq-icon {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--accent);
    transition: transform 0.3s;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out, padding 0.3s;
    background: var(--bg);
    padding: 0 1.5rem;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 1.5rem;
    border-top: 3px solid var(--border);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-item:hover {
    box-shadow: 4px 4px 0px 0px var(--accent);
    transform: translate(-2px, -2px);
}

@media (max-width: 768px) {
    .semantic-block {
        padding: 1.5rem;
        margin-bottom: 2.5rem;
    }

    .semantic-block h2 {
        font-size: 1.8rem;
    }

    .tool-desc-meta {
        display: none;
    }
}

.did-you-know {
    background: var(--bg);
    border: 3px dashed var(--accent);
    padding: 1.5rem;
    position: relative;
    margin-top: 1rem;
}

.did-you-know::before {
    content: "💡";
    position: absolute;
    top: -1.2rem;
    left: 1.5rem;
    background: var(--accent);
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 3px solid var(--border);
    font-size: 1.2rem;
}

.did-you-know p {
    font-size: 0.95rem;
    font-style: italic;
    opacity: 0.9;
}

/* Visual Semantics: Figure & Annotated Tutorials */
.visual-verification {
    border-top: 4px solid var(--border);
    padding-top: 3rem;
}

.annotated-tutorial {
    margin: 2rem 0;
    border: 6px solid var(--border);
    box-shadow: var(--shadow);
    background: #000;
}

.annotated-tutorial img {
    width: 100%;
    height: auto;
    display: block;
}

.annotated-tutorial figcaption {
    padding: 1.5rem;
    background: var(--pane-bg);
    border-top: 4px solid var(--border);
    font-weight: 700;
    font-size: 1rem;
    color: var(--text);
}

/* Visual Semantics: Related Utilities Grid */
.related-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.related-tool-card {
    padding: 1.5rem !important;
    gap: 0.5rem !important;
    box-shadow: 4px 4px 0px 0px var(--border) !important;
    background: var(--pane-bg) !important;
}

.related-tool-card h4 {
    font-size: 1.1rem;
    margin: 0;
    color: var(--text);
}

.related-tool-card p {
    font-size: 0.85rem;
    margin: 0;
    opacity: 0.8;
    line-height: 1.4;
}

.related-tool-card:hover {
    box-shadow: 6px 6px 0px 0px var(--tool-accent, var(--border)) !important;
    transform: translate(-2px, -2px) !important;
}

/* Color Psychology: Action Buttons */
.btn-primary {
    background: var(--color-primary) !important;
    color: #fff !important;
    border-color: var(--border) !important;
}

.btn-destructive {
    background: var(--color-destructive) !important;
    color: #fff !important;
    border-color: var(--border) !important;
}


.technical-narrative {
    margin-bottom: 2rem;
}

.technical-narrative p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

.technical-narrative p:last-child {
    margin-bottom: 0;
}

/* Footer Links */
.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--text);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    transition: 0.2s;
    border-bottom: 2px solid transparent;
}

.footer-link:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* Static Pages */
.static-page {
    padding: 6rem 5%;
    min-height: 70vh;
}

.static-content {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    border: 6px solid var(--border);
    padding: 4rem;
    box-shadow: var(--shadow);
}

.static-content h1 {
    font-size: 3rem;
    font-weight: 900;
    text-transform: uppercase;
    margin-bottom: 2.5rem;
    border-bottom: 6px solid var(--accent);
    display: inline-block;
}

.static-text-body h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem 0;
    text-transform: uppercase;
}

.static-text-body p {
    font-size: 1.15rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

@media (max-width: 768px) {
    .static-content {
        padding: 2rem;
    }

    .static-content h1 {
        font-size: 2rem;
    }

    .footer-links {
        gap: 1rem;
    }
}