@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;700;900&display=swap');
:root {
    --void: #0a0a0a;
    --surface: #ffffff;
    --text-main: #0a0a0a;
    --text-dim: #666666;
    --accent: #77BBA2;
    --border: #0a0a0a;
    --bg: #ffffff;
    --topbar-h: 56px;
}
body, .app {
    background-color: var(--bg);
    color: var(--text-main);
    font-family: 'Space Grotesk', system-ui, sans-serif;
    margin: 0;
}
h1, h2, h3 {
    font-weight: 900;
    letter-spacing: -1px;
    text-transform: uppercase;
    margin: 0 0 15px 0;
}
#app-topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topbar-h);
    background: var(--void);
    border-bottom: 3px solid var(--border);
    display: flex;
    align-items: center;
    z-index: 200;
    padding: 0 20px;
    gap: 0;
    box-sizing: border-box;
}
.topbar-left {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
}
.topbar-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 10px;
    pointer-events: none;
}
.topbar-logo {
    width: 24px;
    height: 24px;
    opacity: 0.9;
}
.topbar-wordmark {
    font-size: 13px;
    font-weight: 900;
    letter-spacing: 4px;
    color: #ffffff;
    text-transform: uppercase;
}
.topbar-right {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
}
.tb-btn {
    background: transparent;
    border: none;
    box-shadow: none;
    color: rgba(255,255,255,0.55);
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 6px 14px;
    cursor: pointer;
    border-radius: 3px;
    transition: color 0.15s, background 0.15s;
    white-space: nowrap;
}
.tb-btn:hover {
    color: #ffffff;
    background: rgba(255,255,255,0.08);
}
.tb-btn:active {
    transform: none;
    box-shadow: none;
}
.tb-btn.tb-active {
    color: #ffffff;
    background: rgba(255,255,255,0.12);
    border-bottom: 2px solid var(--accent);
}
.tb-dropdown-wrap {
    position: relative;
}
.tb-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: #1a1a1a;
    border: 2px solid #333333;
    min-width: 220px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5);
    z-index: 300;
    padding: 6px 0;
    display: none;
}
.tb-dropdown.open {
    display: block;
    animation: dropIn 0.15s ease;
}
@keyframes dropIn {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}
.tb-dd-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    color: rgba(255,255,255,0.7);
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: background 0.1s, color 0.1s;
    white-space: nowrap;
    border-left: 3px solid transparent;
}
.tb-dd-item:hover {
    background: rgba(255,255,255,0.06);
    color: #ffffff;
    border-left-color: var(--accent);
}
.tb-dd-item .dd-progress-bar {
    flex: 1;
    height: 3px;
    background: #333;
    margin-top: 4px;
    position: relative;
}
.tb-dd-item .dd-progress-fill {
    height: 100%;
    background: var(--accent);
    transition: width 0.6s ease;
}
.tb-dd-inner {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
}
.tb-dd-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.tb-dd-pct {
    font-size: 10px;
    color: var(--accent);
    font-weight: 700;
    margin-top: 3px;
    letter-spacing: 1px;
}
.tb-dd-separator {
    height: 1px;
    background: #333;
    margin: 5px 0;
}
.tb-dd-empty {
    padding: 10px 16px;
    color: #555;
    font-size: 11px;
    font-family: monospace;
}
.tb-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid #333;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 900;
    color: #ffffff;
    cursor: pointer;
    flex-shrink: 0;
    transition: border-color 0.15s;
}
.tb-avatar:hover {
    border-color: var(--accent);
}
.tb-dropdown-wrap.right .tb-dropdown {
    left: auto;
    right: 0;
}
.app {
    display: flex;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    flex-direction: column;
}
.workspace {
    flex-grow: 1;
    background-color: var(--bg);
    color: var(--text-main);
    padding: 40px 60px;
    overflow-y: auto;
    overflow-x: hidden;
    height: calc(100vh - var(--topbar-h));
    margin-top: var(--topbar-h);
    box-sizing: border-box;
    background-image: radial-gradient(var(--text-dim) 1px, transparent 1px);
    background-size: 30px 30px;
}
body.lesson-active .workspace { padding: 40px 60px; }
body.lesson-active #app-topbar { pointer-events: none; opacity: 0.7; }
.view-layer {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 40px;
    background: var(--surface);
    border: 4px solid var(--border);
    box-shadow: 12px 12px 0px rgba(0,0,0,0.05);
    animation: fadeIn 0.3s ease;
    box-sizing: border-box;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}
.explorer-header {
    margin-bottom: 48px;
    border-bottom: 4px solid var(--border);
    padding-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 12px;
}
.category-filters {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.filter-btn {
    padding: 8px 18px;
    background-color: var(--bg);
    color: var(--text-main);
    border: 2px solid var(--border);
    cursor: pointer;
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 2px 2px 0px var(--border);
    transition: transform 0.1s, box-shadow 0.1s;
}
.filter-btn:active { transform: translate(2px,2px); box-shadow: none; }
.filter-btn.active { background-color: var(--border); color: #ffffff; }
#search-bar {
    padding: 14px 16px;
    background-color: var(--surface);
    color: var(--text-main);
    border: 2px solid var(--border);
    font-family: monospace;
    font-size: 14px;
    font-weight: bold;
    outline: none;
    width: 250px;
    box-shadow: 4px 4px 0px var(--border);
}
#search-bar:focus { box-shadow: 4px 4px 0px var(--accent); }
#search-bar::placeholder { color: var(--text-dim); }
.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 24px;
}
.course-card, .practice-card {
    background-color: var(--surface);
    border: 3px solid var(--border);
    padding: 25px;
    display: flex;
    flex-direction: column;
    box-shadow: 8px 8px 0px var(--border);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.course-card:hover, .practice-card:hover {
    transform: translateY(-4px);
    box-shadow: 12px 12px 0px var(--accent);
}
.course-card h3, .practice-card h3 { margin-bottom: 10px; font-size: 22px; }
.course-card p {
    color: var(--text-main);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 24px;
    flex-grow: 1;
}
.syllabus-meta {
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 4px solid var(--border);
}
.syllabus-meta h1 {
    font-size: 36px;
    margin-bottom: 12px;
}
.syllabus-sections-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 8px;
}
@media (max-width: 700px) {
    .syllabus-sections-grid { grid-template-columns: 1fr; }
}
.sec-card {
    border: 3px solid var(--border);
    background: var(--surface);
    box-shadow: 5px 5px 0px var(--border);
    overflow: hidden;
    transition: box-shadow 0.2s;
}
.sec-card:hover { box-shadow: 7px 7px 0px var(--accent); }
.sec-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background: var(--border);
    color: var(--surface);
    cursor: pointer;
    user-select: none;
    gap: 10px;
}
.sec-card-title {
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 2px;
    text-transform: uppercase;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.sec-card-meta {
    font-size: 10px;
    color: rgba(255,255,255,0.5);
    font-family: monospace;
    white-space: nowrap;
    flex-shrink: 0;
}
.sec-card-arrow {
    font-size: 10px;
    color: rgba(255,255,255,0.6);
    flex-shrink: 0;
    transition: transform 0.2s;
}
.sec-card.open .sec-card-arrow { transform: rotate(90deg); }
.sec-card-body {
    display: none;
    border-top: 2px solid var(--border);
}
.sec-card.open .sec-card-body { display: block; }
.lesson-row {
    padding: 14px 18px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(0,0,0,0.08);
    cursor: pointer;
    transition: background-color 0.1s ease;
    gap: 10px;
}
.lesson-row:hover { background-color: #f5f5f5; }
.lesson-row:last-child { border-bottom: none; }
.lesson-title {
    color: var(--text-main);
    font-size: 13px;
    font-weight: 700;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.lesson-type-tag {
    font-size: 9px;
    font-family: monospace;
    font-weight: bold;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-dim);
    flex-shrink: 0;
}
.rating-display { display: flex; gap: 4px; flex-shrink: 0; }
.rating-dot {
    width: 7px;
    height: 7px;
    border: 2px solid var(--border);
    background-color: transparent;
}
.rating-dot.filled { background-color: var(--accent); border-color: var(--accent); }
#view-lesson {
    height: auto;
    display: block;
    overflow: visible;
    box-sizing: border-box;
    max-width: 100%;
}
.lesson-workspace {
    max-width: 760px;
    width: 100%;
    margin: 0 auto;
    height: auto;
    overflow: visible;
    padding-bottom: 80px;
    box-sizing: border-box;
}
#course-header {
    width: 100%;
    background-color: var(--bg);
    margin-bottom: 32px;
    padding-bottom: 18px;
    border-bottom: 4px solid var(--border);
    font-size: 12px;
    font-weight: 900;
    color: var(--text-main);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
#module-content {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 100%;
    overflow-wrap: break-word;
    word-wrap: break-word;
    box-sizing: border-box;
}
#module-content p { margin-bottom: 20px; }
#module-content code {
    font-family: monospace;
    font-size: 14px;
    font-weight: bold;
    background-color: #f0f0f0;
    color: var(--text-main);
    border: 2px solid var(--border);
    padding: 2px 6px;
}
#module-content pre {
    background-color: var(--text-main);
    color: var(--surface);
    padding: 20px;
    border: 4px solid var(--border);
    overflow-x: auto;
    font-family: monospace;
    font-size: 14px;
    line-height: 1.8;
    margin: 20px 0;
    box-shadow: 6px 6px 0px var(--accent);
    max-width: 100%;
    box-sizing: border-box;
}
#module-content pre code { background: none; border: none; padding: 0; color: inherit; }
.mcq-option {
    display: block;
    width: 100%;
    margin: 12px 0;
    padding: 18px 20px;
    background-color: var(--bg);
    border: 3px solid var(--border);
    color: var(--text-main);
    cursor: pointer;
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-weight: 700;
    font-size: 16px;
    text-align: left;
    box-shadow: 4px 4px 0px var(--border);
    transition: transform 0.1s, box-shadow 0.1s;
    box-sizing: border-box;
    white-space: normal;
    overflow-wrap: break-word;
    word-wrap: break-word;
    max-width: 100%;
}
.mcq-option:hover:not(.locked) {
    transform: translate(2px,2px);
    box-shadow: 2px 2px 0px var(--accent);
    border-color: var(--accent);
}
.mcq-option:active:not(.locked) { transform: translate(4px,4px); box-shadow: none; }
.mcq-option.locked { cursor: default; opacity: 0.65; box-shadow: none; transform: translate(4px,4px); }
.mcq-option.reveal-correct  { border-color: var(--accent); background-color: rgba(119,187,162,0.2); }
.mcq-option.reveal-incorrect { border-color: #ff4444; background-color: rgba(255,68,68,0.1); }
.challenge-workspace {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    height: 400px;
    margin-top: 24px;
    max-width: 100%;
    box-sizing: border-box;
}
.challenge-prompt {
    background-color: var(--surface);
    padding: 24px;
    border: 3px solid var(--border);
    font-size: 15px;
    line-height: 1.8;
    overflow-y: auto;
    box-shadow: 4px 4px 0px var(--border);
    box-sizing: border-box;
    overflow-wrap: break-word;
    word-wrap: break-word;
}
.challenge-editor-wrapper { display: flex; flex-direction: column; }
.challenge-editor {
    flex-grow: 1;
    background-color: var(--text-main);
    color: var(--surface);
    border: 3px solid var(--border);
    padding: 20px;
    font-family: monospace;
    font-size: 14px;
    resize: none;
    outline: none;
    line-height: 1.8;
    box-shadow: 4px 4px 0px var(--accent);
    white-space: pre;
    overflow-x: auto;
    overflow-wrap: normal;
    word-wrap: normal;
}
.challenge-console {
    margin-top: 15px;
    color: #ff4444;
    font-size: 14px;
    min-height: 20px;
    font-family: monospace;
    font-weight: bold;
}
.preview-wrapper { display: flex; flex-direction: column; height: 100%; }
.preview-frame {
    flex-grow: 1;
    width: 100%;
    border: 3px solid var(--border);
    background-color: #ffffff;
    box-shadow: 4px 4px 0px var(--border);
    box-sizing: border-box;
}
.preview-label {
    font-size: 10px;
    font-family: monospace;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 8px;
    color: var(--text-dim);
}
.explanation-box {
    margin-top: 30px;
    padding: 20px 25px;
    background-color: var(--surface);
    border: 3px solid var(--border);
    border-left: 10px solid var(--accent);
    color: var(--text-main);
    font-size: 15px;
    line-height: 1.8;
    animation: fadeIn 0.3s ease;
    box-shadow: 6px 6px 0px rgba(0,0,0,0.05);
}
button {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    text-transform: uppercase;
    font-weight: 900;
    letter-spacing: 1px;
    cursor: pointer;
    background-color: var(--surface);
    color: var(--text-main);
    border: 2px solid var(--border);
    padding: 12px 20px;
    box-shadow: 4px 4px 0px var(--border);
    transition: transform 0.1s, box-shadow 0.1s, background-color 0.2s;
}
button:active:not(:disabled) { transform: translate(4px,4px) !important; box-shadow: none !important; }
button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
    transform: translate(4px,4px);
}
#lesson-action-btn, #lesson-read-btn, .controls button {
    background-color: var(--accent);
    color: #ffffff;
    box-shadow: 4px 4px 0px var(--border);
}
.controls {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
    width: 100%;
    background-color: var(--bg);
}
.danger-btn { color: #ff4444; border-color: var(--border); }
.danger-btn:hover:not(:disabled) { background-color: #ff4444; color: #ffffff; }
.lesson-footer {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 20px;
    margin-top: 48px;
    padding-top: 20px;
    border-top: 4px solid var(--border);
}
.progress-dots { display: flex; gap: 8px; }
.p-dot {
    width: 12px;
    height: 12px;
    border: 2px solid var(--border);
    background-color: var(--surface);
}
.p-dot.active    { border-color: var(--accent); background-color: transparent; }
.p-dot.correct   { background-color: var(--accent); border-color: var(--accent); }
.p-dot.incorrect { background-color: var(--border); border-color: var(--border); }
.course-progress-wrapper {
    margin-top: 8px;
    width: 100%;
    height: 10px;
    background-color: #e8e8e8;
    border: 2px solid var(--border);
}
.course-progress-fill {
    height: 100%;
    background-color: var(--accent);
    border-right: 2px solid var(--border);
    width: 0%;
    transition: width 0.8s cubic-bezier(0.2,0.8,0.2,1);
}
.practice-btn-group { display: flex; gap: 15px; margin-top: auto; }
.practice-btn-group button { flex: 1; }
.strike-dot {
    width: 14px;
    height: 14px;
    background-color: transparent;
    border: 2px solid var(--border);
}
.strike-dot.lost { background-color: #ff4444; border-color: var(--border); }
.master-test-row {
    margin-top: 24px;
    grid-column: 1 / -1;
    padding: 22px;
    border: 3px solid var(--border);
    background-color: var(--surface);
    text-align: center;
    cursor: pointer;
    box-shadow: 6px 6px 0px var(--accent);
    transition: transform 0.1s, box-shadow 0.1s;
}
.master-test-row:hover  { transform: translate(2px,2px); box-shadow: 4px 4px 0px var(--accent); }
.master-test-row:active { transform: translate(6px,6px); box-shadow: none; }
.master-test-title { font-size: 18px; font-weight: 900; text-transform: uppercase; }
.master-subtitle { font-size: 13px; color: var(--accent); margin-top: 6px; font-weight: bold; }
.danger-zone {
    margin-top: 40px;
    border: 4px solid #ff4444;
    background-color: rgba(255,68,68,0.05);
    padding: 30px;
    box-shadow: 8px 8px 0px rgba(255,68,68,0.2);
}
.danger-zone h3 { color: #ff4444; margin-bottom: 15px; }
#wipe-confirm-input {
    padding: 14px;
    border: 3px solid #ff4444;
    font-family: monospace;
    font-size: 16px;
    outline: none;
    background: #ffffff;
    color: #ff4444;
    font-weight: bold;
    box-shadow: 4px 4px 0px rgba(255,68,68,0.2);
    width: 100%;
    max-width: 300px;
    margin-bottom: 20px;
}
.b-enroll-btn {
    background-color: var(--border) !important;
    color: var(--surface) !important;
    border: 2px solid var(--border) !important;
    box-shadow: 4px 4px 0px var(--accent) !important;
}
.b-enroll-btn:hover { background-color: var(--accent) !important; color: #ffffff !important; }
.fb-code-block {
    background: var(--void);
    color: var(--surface);
    font-family: monospace;
    font-size: 14px;
    line-height: 2;
    padding: 20px 24px;
    border: 4px solid var(--border);
    box-shadow: 6px 6px 0px var(--accent);
    margin-bottom: 24px;
    white-space: pre-wrap;
}
.fb-code-text { color: var(--surface); }
.fb-input {
    background: #2a2a2a;
    color: #ffffff;
    border: none;
    border-bottom: 2px solid var(--accent);
    font-family: monospace;
    font-size: 14px;
    padding: 2px 6px;
    outline: none;
    width: 120px;
    text-align: center;
    margin: 0 4px;
}
.fb-input:focus { border-bottom-color: #ffffff; background: #333333; }
.fb-correct { border-bottom-color: var(--accent) !important; color: var(--accent) !important; }
.fb-wrong { border-bottom-color: #ff4444 !important; color: #ff4444 !important; text-decoration: line-through; }
.sb-hint {
    font-size: 12px;
    font-family: monospace;
    color: var(--text-dim);
    margin-bottom: 12px;
    letter-spacing: 1px;
}
.sb-code-block {
    border: 4px solid var(--border);
    box-shadow: 6px 6px 0px var(--border);
    overflow: hidden;
    margin-bottom: 24px;
    background: var(--void);
}
.sb-line {
    display: flex;
    align-items: stretch;
    cursor: pointer;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    transition: background 0.1s;
}
.sb-line:last-child { border-bottom: none; }
.sb-line:hover { background: rgba(255,255,255,0.06); }
.sb-line.sb-selected { background: rgba(119,187,162,0.15); border-left: 3px solid var(--accent); }
.sb-line.sb-reveal-correct { background: rgba(119,187,162,0.2); border-left: 4px solid var(--accent); }
.sb-line.sb-reveal-wrong { background: rgba(255,68,68,0.15); border-left: 4px solid #ff4444; }
.sb-num {
    width: 40px;
    flex-shrink: 0;
    text-align: right;
    padding: 8px 10px;
    color: #555555;
    font-family: monospace;
    font-size: 13px;
    background: #1a1a1a;
    border-right: 1px solid #2a2a2a;
    user-select: none;
}
.sb-code { padding: 8px 16px; font-family: monospace; font-size: 13px; color: #d4d4d4; white-space: pre; flex: 1; }
.proj-wrap {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 120px);
    min-height: 560px;
    border: 4px solid var(--border);
    box-shadow: 8px 8px 0px var(--border);
    background: var(--bg);
    overflow: hidden;
}
.proj-topbar {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--border);
    padding: 8px 14px;
    flex-shrink: 0;
    flex-wrap: wrap;
    min-height: 48px;
}
.proj-title {
    color: var(--surface);
    font-size: 13px;
    font-weight: 900;
    letter-spacing: 1px;
    text-transform: uppercase;
    white-space: nowrap;
    margin-right: 4px;
}
.proj-tabs { display: flex; gap: 4px; flex-wrap: wrap; flex: 1; }
.proj-tab {
    background: rgba(255,255,255,0.08);
    color: rgba(255,255,255,0.6);
    border: 1px solid rgba(255,255,255,0.15);
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 11px;
    font-weight: 700;
    padding: 4px 10px;
    cursor: pointer;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    box-shadow: none;
    transition: background 0.1s, color 0.1s;
    white-space: nowrap;
}
.proj-tab:hover { background: rgba(255,255,255,0.15); color: #ffffff; }
.proj-tab:active { transform: none; box-shadow: none; }
.proj-tab.proj-tab-active { background: var(--surface); color: var(--text-main); border-color: var(--surface); }
.proj-tab.proj-tab-done { background: rgba(119,187,162,0.25); color: var(--accent); border-color: var(--accent); }
.proj-tab.proj-tab-active.proj-tab-done { background: var(--accent); color: #ffffff; border-color: var(--accent); }
.proj-topbar-actions { display: flex; gap: 6px; }
.proj-action-btn {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 12px;
    font-weight: 900;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 6px 14px;
    cursor: pointer;
    background: rgba(255,255,255,0.1);
    color: #ffffff;
    border: 1px solid rgba(255,255,255,0.25);
    box-shadow: none;
    white-space: nowrap;
    transition: background 0.1s;
}
.proj-action-btn:hover { background: rgba(255,255,255,0.2); }
.proj-action-btn:active { transform: none; box-shadow: none; }
.proj-action-btn:disabled { opacity: 0.3; cursor: not-allowed; transform: none; box-shadow: none; }
.proj-action-accent { background: var(--accent); border-color: var(--accent); color: #ffffff; }
.proj-action-accent:hover { background: #66aa91; }
.proj-action-run { background: #2a2a2a; border-color: #444444; color: var(--accent); }
.proj-action-run:hover { background: #333333; }
.proj-body {
    display: grid;
    grid-template-columns: 1fr 320px;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}
.proj-editor-col {
    display: flex;
    flex-direction: column;
    border-right: 3px solid var(--border);
    min-height: 0;
    overflow: hidden;
}
.proj-editor-label {
    background: #1a1a1a;
    color: #555555;
    font-family: monospace;
    font-size: 11px;
    padding: 5px 12px;
    letter-spacing: 2px;
    flex-shrink: 0;
}
.proj-editor-wrap { display: flex; flex: 1; min-height: 0; overflow: hidden; }
.proj-line-numbers {
    background: #1a1a1a;
    color: #555555;
    font-family: monospace;
    font-size: 13px;
    line-height: 1.55;
    padding: 10px 8px;
    text-align: right;
    user-select: none;
    overflow-y: hidden;
    overflow-x: hidden;
    white-space: pre;
    pointer-events: none;
    min-width: 36px;
    border-right: 1px solid #2a2a2a;
    flex-shrink: 0;
}
.proj-editor {
    flex: 1;
    background: var(--void);
    color: #d4d4d4;
    font-family: monospace;
    font-size: 13px;
    line-height: 1.55;
    padding: 10px 12px;
    border: none;
    outline: none;
    resize: none;
    white-space: pre;
    overflow-x: auto;
    overflow-y: auto;
    overflow-wrap: normal;
    word-wrap: normal;
}
.proj-right-col {
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    background: var(--surface);
}
.proj-preview-label {
    background: var(--border);
    color: var(--surface);
    font-size: 10px;
    font-family: monospace;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 5px 12px;
    flex-shrink: 0;
}
.proj-frame { flex: 1; min-height: 0; width: 100%; border: none; border-bottom: 2px solid var(--border); background: #ffffff; }
.proj-console-label {
    background: #1a1a1a;
    color: #555555;
    font-size: 10px;
    font-family: monospace;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 4px 12px;
    flex-shrink: 0;
}
.proj-console {
    background: var(--void);
    color: var(--text-dim);
    font-family: monospace;
    font-size: 12px;
    padding: 10px 14px;
    flex: 0 0 120px;
    overflow-y: auto;
    line-height: 1.7;
}
.proj-instr-bar { background: var(--surface); border-top: 3px solid var(--border); flex-shrink: 0; max-height: 120px; overflow-y: auto; }
.proj-instr-inner {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding: 10px 16px;
    flex-wrap: wrap;
}
.proj-instr-label { font-size: 10px; font-weight: 900; letter-spacing: 2px; text-transform: uppercase; color: var(--text-dim); white-space: nowrap; flex-shrink: 0; }
.proj-instr-title { font-size: 13px; font-weight: 900; text-transform: uppercase; color: var(--text-main); white-space: nowrap; flex-shrink: 0; }
.proj-instr-text { font-size: 13px; color: var(--text-main); line-height: 1.6; font-family: monospace; flex: 1; min-width: 200px; }
.proj-instr-done { font-size: 10px; font-weight: 900; letter-spacing: 2px; text-transform: uppercase; color: var(--accent); border: 1px solid var(--accent); padding: 2px 8px; white-space: nowrap; flex-shrink: 0; }
.diff-btn {
    padding: 6px 14px;
    background-color: var(--bg);
    color: var(--text-dim);
    border: 2px solid var(--border);
    cursor: pointer;
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 2px 2px 0px var(--border);
    transition: transform 0.1s, box-shadow 0.1s;
}
.diff-btn.active { background-color: var(--border); color: #ffffff; }
.diff-badge {
    display: inline-block;
    font-size: 9px;
    font-weight: 900;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 2px 7px;
    border: 1px solid var(--border);
    margin-left: 8px;
    vertical-align: middle;
    opacity: 0.6;
}
.diff-badge.beginner     { border-color: var(--accent); color: var(--accent); }
.diff-badge.intermediate { border-color: #e0a030; color: #e0a030; }
.diff-badge.advanced     { border-color: #ff4444; color: #ff4444; }
.hub-tab {
    padding: 8px 20px;
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text-dim);
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    box-shadow: none;
    transition: background 0.1s, color 0.1s;
}
.hub-tab:first-child { border-right: none; }
.hub-tab.active { background: var(--border); color: var(--surface); box-shadow: none; }
.hub-tab:active { transform: none; box-shadow: none; }
.theme-swatch {
    padding: 8px 18px;
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 3px 3px 0px rgba(0,0,0,0.2);
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: transform 0.1s, box-shadow 0.1s;
}
.theme-swatch.active-theme { outline: 3px solid var(--accent); outline-offset: 2px; }
.theme-swatch:active { transform: translate(2px,2px); box-shadow: none; }
.rating-dot.mastery {
    background-color: #f5c842;
    border-color: #c9a200;
    clip-path: polygon(50% 0%,61% 35%,98% 35%,68% 57%,79% 91%,50% 70%,21% 91%,32% 57%,2% 35%,39% 35%);
}
.rating-star {
    width: 10px;
    height: 10px;
    background-color: #f5c842;
    border: none;
    clip-path: polygon(50% 0%,61% 35%,98% 35%,68% 57%,79% 91%,50% 70%,21% 91%,32% 57%,2% 35%,39% 35%);
    display: inline-block;
}
.mastery-badge {
    font-size: 9px;
    font-weight: 900;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: #c9a200;
    margin-left: 6px;
    vertical-align: middle;
}
.practice-settings {
    margin-top: 12px;
    padding: 12px;
    border: 2px solid var(--border);
    background: var(--bg);
    font-size: 12px;
}
.practice-settings-title {
    font-size: 10px;
    font-weight: 900;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 8px;
}
.practice-settings label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 5px;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
}
.docs-course-group { margin-bottom: 32px; }
.docs-course-title {
    font-size: 13px;
    font-weight: 900;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-dim);
    border-bottom: 2px solid var(--border);
    padding-bottom: 8px;
    margin-bottom: 12px;
}
.docs-lesson-row {
    padding: 12px 16px;
    border: 2px solid var(--border);
    margin-bottom: 6px;
    cursor: pointer;
    transition: background 0.1s, border-color 0.1s;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.docs-lesson-row:hover { background: var(--bg); border-color: var(--accent); }
.docs-lesson-title { font-size: 14px; font-weight: 700; }
.docs-lesson-meta { font-size: 11px; color: var(--text-dim); font-family: monospace; }
.public-course-card {
    background: var(--surface);
    border: 3px solid var(--border);
    padding: 24px;
    box-shadow: 6px 6px 0px var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.public-course-card:hover { transform: translateY(-3px); box-shadow: 10px 10px 0px var(--accent); }
.public-course-card h3 { margin: 0; font-size: 20px; }
.public-course-card p {
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-dim);
    flex-grow: 1;
    margin: 0;
}
.public-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 8px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}
.public-card-meta { font-size: 11px; font-family: monospace; color: var(--text-dim); }
.bundle-header {
    padding: 14px 20px;
    background: var(--bg);
    border: 2px solid var(--border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2px;
    font-weight: 700;
    font-size: 14px;
    transition: background 0.1s;
}
.bundle-header:hover { background: #f0f0f0; }
.bundle-header .bundle-arrow { font-size: 12px; color: var(--text-dim); }
.bundle-lessons { border: 2px solid var(--border); border-top: none; margin-bottom: 12px; }
.course-home-card {
    background: var(--surface);
    border: 3px solid var(--border);
    padding: 24px;
    box-shadow: 6px 6px 0px var(--border);
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
    display: flex;
    flex-direction: column;
}
.course-home-card:hover {
    transform: translateY(-3px);
    box-shadow: 8px 8px 0px var(--accent);
}
.course-home-title {
    font-size: 18px;
    font-weight: 900;
    letter-spacing: -0.5px;
    text-transform: uppercase;
    margin-bottom: 4px;
}
.course-home-pct {
    font-size: 13px;
    color: var(--accent);
    font-weight: 700;
    margin-bottom: 2px;
}
.course-home-meta {
    font-size: 11px;
    font-family: monospace;
    color: var(--text-dim);
    margin-top: 10px;
}
#syllabus-return-btn {
    background: transparent;
    border: none;
    box-shadow: none;
    color: var(--text-dim);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 0;
    cursor: pointer;
    margin-bottom: 20px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: color 0.15s;
}
#syllabus-return-btn:hover {
    color: var(--text-main);
    box-shadow: none;
    transform: none;
}
#syllabus-return-btn:active {
    transform: none;
    box-shadow: none;
}
.syllabus-meta h1 {
    font-size: 30px;
}
#lesson-back-btn {
    top: 70px !important;
}
#errorOverlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 299;
}
#errorBox {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--surface);
    border: 4px solid var(--border);
    box-shadow: 8px 8px 0px var(--border);
    font-family: 'Space Grotesk', system-ui, sans-serif;
    padding: 40px;
    max-width: 400px;
    width: 90%;
    z-index: 300;
    animation: errorBoxFadeIn 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
#errorBox button {
    align-self: flex-end;
}
@keyframes errorBoxFadeIn {
    from { opacity: 0; scale: 0.97; }
    to   { opacity: 1; scale: 1; }
}
#onboardingOverlay {
    z-index: 9998;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.5);
}
#onboardingCard {
    position: fixed;
    background: var(--surface);
    border: 4px solid var(--border);
    box-shadow: 8px 8px 0px var(--border);
    font-family: 'Space Grotesk', system-ui, sans-serif;
    padding: 40px;
    width: 280px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.onboardingFadeout {
    animation: fadeOut 0.3s ease forwards;
}