:root {
    --bg-editor: #2b2b2b;
    --bg-sidebar: #3c3f41;
    --bg-toolbar: #3c3f41;
    --bg-hover: #4e5254;
    --bg-selection: #214283;
    --bg-card: #313335;
    --border: #323232;
    --text: #bababa;
    --text-muted: #a0a0a0;
    --text-bright: #e0e0e0;
    --syntax-keyword: #cc7832;
    --syntax-string: #6a8759;
    --syntax-number: #6897bb;
    --syntax-function: #ffc66d;
    --syntax-comment: #808080;
    --syntax-link: #5ccfe6;
    
    --sidebar-width: 280px;
    --strip-width: 28px;
    --header-height: 28px;
    --status-height: 24px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 14px;
    background: var(--bg-editor);
    color: var(--text);
}

/* ============================================
   Main Grid Layout
   4 columns: strip | sidebar | content | strip
   3 rows: header | main | status
   ============================================ */

.ide-grid {
    display: grid;
    grid-template-columns: var(--strip-width) var(--sidebar-width) 1fr var(--strip-width);
    grid-template-rows: var(--header-height) 1fr var(--status-height);
    height: 100vh;
    border: 1px solid var(--border);
}

/* Left strip - spans all rows */
.strip-left {
    grid-column: 1;
    grid-row: 1 / -1;
    background: var(--bg-toolbar);
    border-right: 1px solid var(--border);
}

/* Right strip - spans all rows */
.strip-right {
    grid-column: 4;
    grid-row: 1 / -1;
    background: var(--bg-toolbar);
    border-left: 1px solid var(--border);
}

/* Row 1: Sidebar header */
.sidebar-header {
    grid-column: 2;
    grid-row: 1;
    background: var(--bg-toolbar);
    border-bottom: 1px solid var(--border);
    border-right: 1px solid var(--border);
    padding: 0 10px;
    display: flex;
    align-items: center;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Row 1: Tab bar */
.tab-bar {
    grid-column: 3;
    grid-row: 1;
    background: var(--bg-toolbar);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding-left: 1px;
}

.tab-bar > span {
    background: var(--bg-editor);
    height: 100%;
    padding: 0 12px;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--text);
    border-right: 1px solid var(--border);
}

.tab-bar .icon {
    margin-right: 0;
}

/* Row 2: Sidebar */
.sidebar {
    grid-column: 2;
    grid-row: 2;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 4px 0;
}

/* Row 2: Main content */
.ide-content {
    grid-column: 3;
    grid-row: 2;
    background: var(--bg-editor);
    overflow-y: auto;
    padding: 30px 40px;
    line-height: 1.7;
}

/* Row 3: Empty cell under sidebar */
.status-empty {
    grid-column: 2;
    grid-row: 3;
    background: var(--bg-toolbar);
    border-right: 1px solid var(--border);
    border-top: 1px solid var(--border);
}

/* Row 3: Status bar */
.status-bar {
    grid-column: 3;
    grid-row: 3;
    background: var(--bg-toolbar);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 8px;
    gap: 10px;
}

.status-bar a {
    color: var(--text);
    display: flex;
    align-items: center;
    transition: color 0.15s;
}

.status-bar a:hover {
    color: #ffffff;
}

.status-bar svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

/* ============================================
   Sidebar / File Tree
   ============================================ */

.sidebar ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.sidebar ul ul {
    padding-left: 16px;
}

.sidebar-item {
    display: flex;
    align-items: center;
    padding: 3px 8px;
    cursor: pointer;
    color: var(--text);
    text-decoration: none;
    transition: background 0.1s;
    font-size: 0.82rem;
}

.sidebar-item:hover {
    background: var(--bg-hover);
}

.sidebar-item.active {
    background: var(--bg-selection);
    color: var(--text-bright);
}

.sidebar-item summary {
    display: flex;
    align-items: center;
    padding: 3px 8px;
    cursor: pointer;
    color: var(--text);
    transition: background 0.1s;
    font-size: 0.82rem;
    list-style: none;
}

.sidebar-item summary::-webkit-details-marker {
    display: none;
}

.sidebar-item summary:hover {
    background: var(--bg-hover);
}

.folder-arrow {
    font-size: 0.65rem;
    color: var(--text);
    margin-right: 2px;
    transition: transform 0.15s ease-in-out;
    display: inline-block;
}

details[open] > summary .folder-arrow {
    transform: rotate(90deg);
}

details > ul {
    animation: slideDown 0.2s ease-out forwards;
    transform-origin: top;
}

@keyframes slideDown {
    0% { opacity: 0; transform: translateY(-5px); }
    100% { opacity: 1; transform: translateY(0); }
}

/* Icons */
.icon {
    width: 16px;
    height: 16px;
    margin-right: 6px;
    flex-shrink: 0;
}

.icon--folder { opacity: 0.6; }
.icon--file { opacity: 0.7; }

/* ============================================
   Typography (Rendered Markdown)
   ============================================ */

.ide-content h1 {
    color: var(--syntax-function);
    font-size: 1.5rem;
    font-weight: 500;
    margin: 0 0 16px 0;
}

.ide-content h2 {
    color: var(--syntax-keyword);
    font-size: 1.1rem;
    font-weight: 500;
    margin: 28px 0 12px 0;
}

.ide-content h3 {
    color: var(--syntax-function);
    font-size: 0.95rem;
    font-weight: 400;
    margin: 16px 0 4px 0;
}

.ide-content p {
    margin: 0 0 12px 0;
    font-size: 0.9rem;
}

.ide-content ul, .ide-content ol {
    padding-left: 20px;
    margin: 0 0 16px 0;
}

.ide-content li {
    margin-bottom: 6px;
    font-size: 0.88rem;
}

.ide-content a {
    color: var(--syntax-link);
    text-decoration: none;
}

.ide-content a:hover {
    text-decoration: underline;
}

.ide-content code {
    background: var(--bg-card);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.85em;
}

.ide-content pre {
    background: var(--bg-card);
    padding: 16px;
    border-radius: 3px;
    overflow-x: auto;
    border: 1px solid var(--border);
}

.ide-content pre code {
    background: none;
    padding: 0;
}

.ide-content blockquote {
    background: var(--bg-card);
    border-left: 3px solid var(--syntax-keyword);
    margin: 16px 0;
    padding: 12px 16px;
    border-radius: 0 3px 3px 0;
}

.ide-content blockquote p { margin: 0; }

.ide-content img {
    max-width: 100%;
    border-radius: 3px;
    border: 1px solid var(--border);
}

.ide-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 24px 0;
}

.ide-content strong {
    color: var(--syntax-number);
    font-weight: 500;
}

/* ============================================
   Helper Classes
   ============================================ */

.text-muted { color: var(--text-muted); }
.comment { color: var(--syntax-comment); font-weight: 300; }

.resume-contact {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 24px;
}

.resume-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 8px;
}

.callout {
    background: var(--bg-card);
    padding: 14px 16px;
    border-radius: 3px;
    border-left: 3px solid var(--syntax-keyword);
    margin: 20px 0;
}

.callout p { margin: 0; }

/* ============================================
   Hamburger Menu (hidden on desktop)
   ============================================ */

.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    margin-right: 8px;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
}

.hamburger span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text-muted);
    transition: all 0.2s;
}

.hamburger:hover span {
    background: var(--text-bright);
}

/* Overlay when sidebar is open */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
}

body.sidebar-open .sidebar-overlay {
    display: block;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 900px) {
    :root {
        --sidebar-width: 220px;
        --strip-width: 0px;
    }
    .strip-left, .strip-right { display: none; }
    .ide-grid {
        grid-template-columns: var(--sidebar-width) 1fr;
    }
    .sidebar-header { grid-column: 1; }
    .tab-bar { grid-column: 2; }
    .sidebar { grid-column: 1; }
    .ide-content { grid-column: 2; padding: 20px; }
    .status-empty { grid-column: 1; }
    .status-bar { grid-column: 2; }
}

@media (max-width: 600px) {
    :root {
        --sidebar-width: 280px;
    }
    
    .ide-grid {
        grid-template-columns: 1fr;
        grid-template-rows: var(--header-height) 1fr var(--status-height);
    }
    
    /* Hide sidebar header row on mobile */
    .sidebar-header { display: none; }
    .status-empty { display: none; }
    
    /* Tab bar spans full width */
    .tab-bar { grid-column: 1; }
    .ide-content { grid-column: 1; }
    .status-bar { grid-column: 1; }
    
    /* Show hamburger */
    .hamburger { display: flex; }
    
    /* Sidebar becomes fixed overlay */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: var(--sidebar-width);
        height: 100vh;
        z-index: 100;
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        border-right: 1px solid var(--border);
    }
    
    /* When open */
    body.sidebar-open .sidebar {
        transform: translateX(0);
    }
    
    /* Close sidebar when clicking a link */
    body.sidebar-open .sidebar-item:not(summary) {
        pointer-events: auto;
    }
}