@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@300;400;500;600;700&display=swap');

:root {
    --bg: #0a0e14;
    --terminal-bg: #0d1117;
    --border: #1e3a2f;
    --green: #00ff41;
    --green-dim: #00cc33;
    --green-dark: #008f11;
    --cyan: #00d4ff;
    --yellow: #ffb627;
    --red: #ff3e3e;
    --white: #c9d1d9;
    --gray: #6e7681;
    --comment: #5c6370;
}

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

body {
    background: var(--bg);
    color: var(--green);
    font-family: 'Fira Code', 'Courier New', monospace;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Scanline effect */
body::after {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,255,65,0.015) 2px, rgba(0,255,65,0.015) 4px);
    z-index: 9999;
    transition: opacity 0.3s;
}
body.readme-mode::after { opacity: 0; }

#matrix-bg {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
    opacity: 0.06;
}

.container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* ─── Terminal Window ─── */
.terminal {
    background: var(--terminal-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin: 20px 0;
    box-shadow: 0 0 30px rgba(0,255,65,0.08), inset 0 0 60px rgba(0,0,0,0.3);
    overflow: hidden;
}
.terminal-header {
    background: linear-gradient(180deg, #1a1e24, #161a20);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--border);
}
.terminal-btn { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }
.btn-close { background: var(--red); }
.btn-min { background: var(--yellow); }
.btn-max { background: var(--green); }
.terminal-title {
    color: var(--gray);
    font-size: 12px;
    margin-left: 8px;
    flex: 1;
    text-align: center;
}
.terminal-body { padding: 20px 24px; min-height: 60px; }

/* ─── ASCII Banner ─── */
.ascii-banner { text-align: center; overflow: hidden; }
.ascii-banner pre {
    font-size: clamp(4px, 1.1vw, 11px);
    line-height: 1.2;
    color: var(--green);
    display: inline-block;
    text-align: left;
    text-shadow: 0 0 10px rgba(0,255,65,0.5);
    animation: glowPulse 3s ease-in-out infinite;
}
@keyframes glowPulse {
    0%, 100% { text-shadow: 0 0 10px rgba(0,255,65,0.3); }
    50% { text-shadow: 0 0 20px rgba(0,255,65,0.6), 0 0 40px rgba(0,255,65,0.2); }
}
img.totoro {
    height: clamp(35px, 7vw, 70px);
    vertical-align: bottom;
    margin-left: 10px;
    margin-bottom: 4px;
    filter: grayscale(1) brightness(1.5) sepia(1) hue-rotate(75deg) saturate(3);
    image-rendering: pixelated;
}

/* ─── Text Styles ─── */
.prompt { color: var(--cyan); }
.prompt-user { color: var(--green); }
.prompt-path { color: var(--cyan); }
.prompt-symbol { color: var(--white); }
.cmd { color: var(--white); }
.output { color: var(--green-dim); }
.comment { color: var(--comment); font-style: italic; }
.highlight { color: var(--yellow); }
.error { color: var(--red); }

.link-text {
    color: var(--cyan);
    text-decoration: none;
    border-bottom: 1px dashed var(--cyan);
    transition: all 0.3s ease;
}
.link-text:hover {
    color: var(--green);
    border-color: var(--green);
    text-shadow: 0 0 8px rgba(0,255,65,0.5);
}

/* ─── Cursor ─── */
.cursor {
    display: inline-block;
    width: 8px; height: 16px;
    background: var(--green);
    animation: blink 1s step-end infinite;
    vertical-align: text-bottom;
    margin-left: 2px;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* ─── Table ─── */
.term-table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 13px; }
.term-table th { color: var(--yellow); text-align: left; padding: 6px 12px; border-bottom: 1px solid var(--green-dark); }
.term-table td { padding: 5px 12px; color: var(--white); border-bottom: 1px solid rgba(30,58,47,0.4); }
.term-table tr:hover td { background: rgba(0,255,65,0.03); }
.term-table .status-ok { color: var(--green); }
.term-table .status-soon { color: var(--yellow); }
.term-table .week-num { color: var(--cyan); text-align: center; }

/* ─── Landing Page ─── */
.landing-page {
    min-height: 85vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.landing-page.hidden { display: none; }
.enter-prompt {
    text-align: center;
    padding: 24px 16px;
    font-size: 13px;
    color: var(--comment);
    cursor: pointer;
    transition: color 0.3s;
    animation: subtlePulse 2s ease-in-out infinite;
}
.enter-prompt:hover { color: var(--green); }
@keyframes subtlePulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* ─── Login ─── */
.login-input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--green);
    font-family: 'Fira Code', monospace;
    font-size: 13px;
    width: 300px;
    max-width: 60vw;
    caret-color: var(--green);
}
.login-input::placeholder { color: var(--comment); font-style: italic; }
.login-line { display: flex; align-items: center; gap: 0; }
.login-label { color: var(--cyan); white-space: pre; }
.login-status { color: var(--yellow); font-style: italic; margin-top: 4px; }
.login-success { color: var(--green); }
.login-motd {
    color: var(--comment);
    font-size: 11px;
    border-left: 2px solid var(--green-dark);
    padding-left: 10px;
    margin: 8px 0;
}

/* ─── Contents Page ─── */
.contents-page { display: none; }
.contents-page.active {
    display: flex;
    position: fixed;
    top: 0; left: 220px; right: 0; bottom: 28px;
    transition: left 0.25s ease;
}
.sidebar.collapsed ~ .split-pane { margin-left: 0; }
.contents-layout { display: flex; flex: 1; min-width: 0; }

/* ─── Sidebar ─── */
.sidebar {
    width: 220px;
    flex-shrink: 0;
    position: fixed;
    left: 0; top: 0; bottom: 0;
    overflow-y: auto;
    background: var(--terminal-bg);
    border-right: 1px solid var(--border);
    padding: 16px 14px;
    font-size: 12px;
    z-index: 100;
    transition: width 0.25s ease, padding 0.25s ease;
}
.sidebar.collapsed {
    width: 36px;
    padding: 16px 6px;
    overflow: hidden;
}
.sidebar.collapsed .sidebar-section,
.sidebar.collapsed .sidebar-back-row { display: none; }
.sidebar-collapse-btn {
    display: block;
    background: none;
    border: 1px solid var(--border);
    color: var(--comment);
    font-size: 12px;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 3px;
    margin-bottom: 10px;
    transition: color 0.2s, border-color 0.2s;
}
.sidebar-collapse-btn:hover { color: var(--green); border-color: var(--green); }
.sidebar-section { margin-bottom: 14px; }
.sidebar-section:last-of-type { margin-bottom: 0; }
.sidebar-title {
    color: var(--yellow);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    padding-bottom: 4px;
    border-bottom: 1px dashed var(--green-dark);
}
.sidebar-title-toggle {
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    user-select: none;
    transition: color 0.2s;
}
.sidebar-title-toggle:hover { color: var(--green); }
.section-arrow { font-size: 8px; color: var(--comment); transition: transform 0.2s; }
.sidebar-nav { list-style: none; padding: 0; margin: 0; }
.sidebar-nav li {
    padding: 5px 8px;
    cursor: pointer;
    color: var(--white);
    border-radius: 4px;
    transition: background 0.2s;
    font-size: 12px;
}
.sidebar-nav li:hover { background: rgba(0,255,65,0.06); color: var(--green); }
.sidebar-schedule { list-style: none; padding: 0; margin: 0; }
.sidebar-schedule li {
    padding: 3px 8px;
    font-size: 11px;
    color: var(--white);
    display: flex;
    align-items: center;
    gap: 6px;
}
.sidebar-schedule .wk { color: var(--cyan); min-width: 18px; font-size: 10px; }
.sidebar-schedule a {
    color: var(--white);
    cursor: pointer;
    text-decoration: none;
    transition: color 0.2s;
    flex: 1;
}
.sidebar-schedule a:hover { color: var(--cyan); }
.sidebar-schedule .status-dot.ok { color: var(--green); font-size: 8px; }
.sidebar-schedule .status-dot.pending { color: var(--comment); font-size: 8px; }
.sidebar-back-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    border-top: 1px dashed var(--green-dark);
    margin-top: 12px;
    padding: 10px 8px 0;
}
.sidebar-back {
    color: var(--comment);
    font-size: 11px;
    cursor: pointer;
    transition: color 0.2s;
}
.sidebar-back:hover { color: var(--green); }
.sidebar-exit {
    color: var(--red, #ff5555);
    font-size: 11px;
    cursor: pointer;
    border-bottom: 1px dashed var(--red, #ff5555);
    transition: color 0.2s;
}
.sidebar-exit:hover { color: #ff7979; }

/* ─── Online Users Panel ─── */
.online-users-list { list-style: none; padding: 0; margin: 0; }
.online-users-list li {
    padding: 3px 8px;
    font-size: 11px;
    color: var(--white);
    display: flex;
    align-items: center;
    gap: 6px;
}
.online-users-list .online-dot {
    width: 6px; height: 6px;
    background: var(--green);
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 4px rgba(0,255,65,0.6);
    animation: onlinePulse 2s ease-in-out infinite;
}
@keyframes onlinePulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}
.online-users-list .user-name { color: var(--white); font-size: 11px; }
.online-users-list .user-name.self { color: var(--cyan); font-weight: 600; }
.online-users-list .online-dot.server {
    background: var(--cyan);
    box-shadow: 0 0 4px rgba(0,200,255,0.6);
}
.online-count { color: var(--green-dim); font-size: 10px; margin-left: auto; }

/* ─── Split Pane ─── */
.split-pane { display: flex; flex-direction: column; flex: 1; min-width: 0; overflow: hidden; }
.pane-top { flex: 1; overflow-y: auto; min-height: 80px; }
.pane-top .terminal { margin: 0; border-radius: 0; border: none; height: 100%; display: flex; flex-direction: column; }
.pane-top .terminal-body { flex: 1; overflow-y: auto; }
.pane-divider {
    height: 5px;
    background: var(--border);
    cursor: row-resize;
    flex-shrink: 0;
    position: relative;
    z-index: 10;
    transition: background 0.15s;
}
.pane-divider:hover, .pane-divider.active { background: var(--green-dark); }
.pane-divider::after {
    content: '⋯';
    position: absolute;
    left: 50%; top: 50%;
    transform: translate(-50%, -50%);
    color: var(--comment);
    font-size: 10px;
    line-height: 1;
}
.pane-bottom { flex: 1; overflow-y: auto; min-height: 80px; background: var(--terminal-bg); }
.pane-bottom .terminal { margin: 0; border-radius: 0; border: none; height: 100%; display: flex; flex-direction: column; }
.pane-bottom .terminal-body { flex: 1; overflow-y: auto; position: relative; }
.pane-bottom .file-viewer { margin-top: 0; }
.pane-bottom .file-viewer iframe { height: 100%; min-height: 300px; }
.pane-bottom .md-viewer { max-height: none; }
.pane-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--comment);
    font-size: 12px;
    font-style: italic;
    padding: 20px;
}

/* Side-by-side mode */
.split-pane.side-view { flex-direction: row; }
.split-pane.side-view .pane-top { min-height: 0; min-width: 200px; }
.split-pane.side-view .pane-bottom { min-height: 0; min-width: 200px; }
.split-pane.side-view .pane-divider { width: 5px; height: auto; cursor: col-resize; }
.split-pane.side-view .pane-divider::after { content: '⋮'; }

/* Layout toggle button */
.layout-toggle {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
    padding: 1px 7px;
    font-size: 10px;
    font-family: 'Fira Code', monospace;
    color: var(--comment);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 3px;
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
}
.layout-toggle:hover { color: var(--green); border-color: var(--green-dark); }
.layout-toggle .icon { font-size: 12px; line-height: 1; }

/* ─── Mobile sidebar toggle ─── */
.mobile-sidebar-toggle {
    display: none;
    position: fixed;
    top: 10px; left: 10px;
    z-index: 250;
    background: var(--terminal-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--green);
    font-family: 'Fira Code', monospace;
    font-size: 18px;
    width: 38px; height: 38px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, border-color 0.2s;
}
.mobile-sidebar-toggle:hover { border-color: var(--green-dark); background: rgba(0,255,65,0.06); }
.mobile-sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.6); z-index: 90; }
.mobile-sidebar-overlay.visible { display: block; }

/* ─── Progress bar ─── */
.progress-bar {
    background: var(--bg);
    border: 1px solid var(--green-dark);
    border-radius: 4px;
    height: 18px;
    overflow: hidden;
    margin: 8px 0;
    position: relative;
}
.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--green-dark), var(--green));
    border-radius: 3px;
    transition: width 2s ease;
    position: relative;
}
.progress-fill::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.1) 50%, transparent 100%);
    animation: shimmer 2s infinite;
}
@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}
.progress-text { color: var(--gray); font-size: 11px; margin-top: 4px; }

/* ─── Boot Sequence ─── */
#boot-screen {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: var(--bg);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    transition: opacity 0.8s ease;
}
#boot-screen.hidden { opacity: 0; pointer-events: none; }
#boot-text { font-size: 14px; text-align: left; max-width: 600px; width: 90%; }
.boot-line { opacity: 0; margin: 3px 0; }
.boot-ok { color: var(--green); }
.boot-info { color: var(--white); }
.boot-warn { color: var(--yellow); }

/* ─── Footer / Status Bar ─── */
.footer {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    padding: 4px 16px;
    color: var(--comment);
    font-size: 11px;
    background: var(--terminal-bg);
    border-top: 1px solid var(--border);
    z-index: 200;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.footer a { color: var(--green-dim); text-decoration: none; }
.footer a:hover { color: var(--green); }

/* ─── View Switch Toggle ─── */
.view-switch { display: flex; align-items: center; gap: 8px; font-size: 11px; }
.view-switch label { color: var(--comment); cursor: pointer; transition: color 0.3s; }
.view-switch label.active { color: var(--green); text-shadow: 0 0 6px rgba(0,255,65,0.4); }
body.readme-mode .view-switch label { color: var(--comment); }
body.readme-mode .view-switch label.active { color: var(--cyan); text-shadow: none; }
body.readme-mode .view-switch .toggle-track { border-color: var(--comment); }
body.readme-mode .view-switch .toggle-thumb { background: var(--cyan); box-shadow: 0 0 4px rgba(0,212,255,0.4); }
.view-switch .toggle-track {
    position: relative;
    width: 32px; height: 16px;
    background: var(--bg);
    border: 1px solid var(--green-dark);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
}
.view-switch .toggle-track .toggle-thumb {
    position: absolute;
    top: 2px; left: 2px;
    width: 10px; height: 10px;
    background: var(--green);
    border-radius: 50%;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 0 6px rgba(0,255,65,0.6);
}
.view-switch .toggle-track.readme .toggle-thumb { transform: translateX(16px); }
#readme-view { display: none; }
#readme-view.active { display: block; }
#terminal-view.hidden { display: none; }

/* ─── README rendered view ─── */
.readme-plain {
    max-width: 900px;
    margin: 60px auto 40px;
    padding: 0;
    background: #ffffff;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 0 40px rgba(0,0,0,0.08);
    overflow: hidden;
}
.readme-plain-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: #f6f8fa;
    border-bottom: 1px solid #d1d9e0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    font-size: 13px;
    color: #1f2328;
}
.readme-plain-header svg { flex-shrink: 0; }
.readme-plain-header span { font-weight: 600; }
.readme-body {
    padding: 32px 40px 40px;
    color: #1f2328;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    font-size: 15px;
    line-height: 1.7;
}
.readme-body h1 { font-size: 28px; border-bottom: 1px solid #d1d9e0; padding-bottom: 10px; margin: 24px 0 16px; color: #1f2328; }
.readme-body h2 { font-size: 22px; border-bottom: 1px solid #d1d9e0; padding-bottom: 8px; margin: 24px 0 14px; color: #1f2328; }
.readme-body h3 { font-size: 18px; margin: 20px 0 10px; color: #1f2328; }
.readme-body h4 { font-size: 15px; margin: 18px 0 8px; color: #1f2328; }
.readme-body code { background: #eff1f3; padding: 2px 6px; border-radius: 4px; font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace; font-size: 13px; color: #1f2328; }
.readme-body pre { background: #f6f8fa; border: 1px solid #d1d9e0; padding: 14px 16px; border-radius: 6px; overflow-x: auto; margin: 12px 0; line-height: 1.5; }
.readme-body pre code { background: none; padding: 0; font-size: 13px; }
.readme-body a { color: #0969da; text-decoration: none; }
.readme-body a:hover { text-decoration: underline; }
.readme-body img { max-width: 100%; border-radius: 4px; }
.readme-body table { border-collapse: collapse; width: 100%; margin: 12px 0; }
.readme-body th, .readme-body td { border: 1px solid #d1d9e0; padding: 8px 12px; text-align: left; }
.readme-body th { background: #f6f8fa; font-weight: 600; }
.readme-body blockquote { border-left: 4px solid #d1d9e0; padding: 4px 16px; color: #656d76; margin: 12px 0; }
.readme-body ul, .readme-body ol { padding-left: 26px; margin: 8px 0; }
.readme-body li { margin: 4px 0; }
.readme-body hr { border: none; border-top: 1px solid #d1d9e0; margin: 20px 0; }
.readme-body strong { font-weight: 600; }

/* ─── Breadcrumb ─── */
.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
    padding: 12px 16px;
    margin-bottom: 10px;
    font-size: 13px;
    background: var(--terminal-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
}
.breadcrumb a { color: var(--cyan); text-decoration: none; transition: color 0.2s, text-shadow 0.2s; }
.breadcrumb a:hover { color: var(--green); text-shadow: 0 0 8px rgba(0,255,65,0.5); }
.breadcrumb .sep { color: var(--green-dark); margin: 0 2px; }
.breadcrumb .current { color: var(--yellow); font-weight: 600; }

/* ─── Markdown viewer ─── */
.md-viewer {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 20px 24px;
    margin: 12px 0;
    max-height: 70vh;
    overflow-y: auto;
    color: var(--white);
    font-size: 13px;
    line-height: 1.7;
}
.md-viewer h1, .md-viewer h2, .md-viewer h3 { color: var(--green); margin: 16px 0 8px; }
.md-viewer h1 { font-size: 20px; border-bottom: 1px solid var(--green-dark); padding-bottom: 6px; }
.md-viewer h2 { font-size: 17px; }
.md-viewer h3 { font-size: 15px; color: var(--cyan); }
.md-viewer code { background: rgba(0,255,65,0.08); padding: 2px 6px; border-radius: 3px; color: var(--green); font-size: 12px; }
.md-viewer pre { background: var(--terminal-bg); border: 1px solid var(--border); padding: 12px; border-radius: 4px; overflow-x: auto; margin: 10px 0; }
.md-viewer pre code { background: none; padding: 0; }
.md-viewer a { color: var(--cyan); }
.md-viewer a:hover { color: var(--green); }
.md-viewer table { border-collapse: collapse; width: 100%; margin: 10px 0; }
.md-viewer th, .md-viewer td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.md-viewer th { background: rgba(0,255,65,0.06); color: var(--green); }
.md-viewer blockquote { border-left: 3px solid var(--green-dark); padding-left: 12px; color: var(--comment); margin: 10px 0; }
.md-viewer ul, .md-viewer ol { padding-left: 24px; margin: 8px 0; }
.md-viewer hr { border: none; border-top: 1px dashed var(--green-dark); margin: 16px 0; }

/* ─── Markdown TOC ─── */
.md-toc-btn {
    background: rgba(0,255,65,0.08);
    border: 1px solid var(--border);
    color: var(--comment);
    font-size: 11px;
    padding: 3px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
    margin-left: auto;
}
.md-toc-btn:hover, .md-toc-btn.active {
    background: rgba(0,255,65,0.15);
    color: var(--green);
    border-color: var(--green-dark);
}
.md-toc-panel {
    display: none;
    position: absolute;
    top: 0;
    right: 0;
    width: 240px;
    max-height: 100%;
    background: var(--bg);
    border-left: 1px solid var(--border);
    z-index: 10;
    overflow-y: auto;
    padding: 10px 0;
    box-shadow: -4px 0 12px rgba(0,0,0,0.3);
}
.md-toc-panel.open { display: block; }
.md-toc-panel .toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px 8px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 6px;
}
.md-toc-panel .toc-header span {
    font-size: 11px;
    font-weight: 600;
    color: var(--green);
    letter-spacing: 1px;
    text-transform: uppercase;
}
.md-toc-panel .toc-close {
    background: none;
    border: none;
    color: var(--comment);
    font-size: 14px;
    cursor: pointer;
    padding: 0 2px;
    line-height: 1;
}
.md-toc-panel .toc-close:hover { color: var(--red); }
.md-toc-panel a {
    display: block;
    padding: 4px 12px;
    font-size: 12px;
    color: var(--white);
    text-decoration: none;
    line-height: 1.5;
    transition: background 0.15s, color 0.15s;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.md-toc-panel a:hover, .md-toc-panel a.active {
    background: rgba(0,255,65,0.08);
    color: var(--green);
}
.md-toc-panel a.toc-h1 { padding-left: 12px; font-weight: 600; }
.md-toc-panel a.toc-h2 { padding-left: 24px; }
.md-toc-panel a.toc-h3 { padding-left: 36px; font-size: 11px; color: var(--comment); }
.md-toc-panel a.toc-h4 { padding-left: 48px; font-size: 11px; color: var(--comment); }

/* ─── File Explorer ─── */
.explorer-breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 2px;
    padding: 8px 0 12px;
    font-size: 13px;
}
.explorer-breadcrumb a { color: var(--cyan); text-decoration: none; cursor: pointer; }
.explorer-breadcrumb a:hover { color: var(--green); text-shadow: 0 0 6px rgba(0,255,65,0.4); }
.explorer-breadcrumb .sep { color: var(--green-dark); margin: 0 3px; }
.explorer-breadcrumb .current-dir { color: var(--yellow); font-weight: 600; }
.file-list { list-style: none; padding: 0; margin: 0; }
.file-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 12px;
    border-bottom: 1px solid rgba(30,58,47,0.3);
    cursor: pointer;
    transition: background 0.2s;
    font-size: 13px;
}
.file-list li:hover { background: rgba(0,255,65,0.04); }
.file-list li:last-child { border-bottom: none; }
.file-list .icon { width: 20px; text-align: center; flex-shrink: 0; }
.file-list .fname { color: var(--white); flex: 1; }
.file-list .fname.dir { color: var(--cyan); font-weight: 600; }
.file-list .fmeta { color: var(--comment); font-size: 11px; }
.file-viewer {
    margin-top: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
}
.file-viewer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    background: rgba(0,255,65,0.04);
    border-bottom: 1px solid var(--border);
    font-size: 12px;
    flex-shrink: 0;
}
.file-viewer-header .file-path { color: var(--cyan); }
.file-viewer-header .close-btn {
    color: var(--comment);
    cursor: pointer;
    padding: 2px 8px;
    border-radius: 3px;
    transition: all 0.2s;
}
.file-viewer-header .close-btn:hover { color: var(--red); background: rgba(255,62,62,0.1); }
.file-viewer iframe { width: 100%; flex: 1; min-height: 200px; border: none; background: #fff; }
.file-viewer img { max-width: 100%; padding: 12px; }

/* ─── Scroll reveal ─── */
.reveal { opacity: 0; transform: translateY(20px); transition: all 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ─── Admin Panel ─── */
.admin-panel {
    padding: 16px 20px;
    font-size: 13px;
    flex: 1;
}
.admin-header {
    color: var(--yellow);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 1px dashed var(--green-dark);
}
.admin-summary {
    display: flex;
    gap: 20px;
    margin-bottom: 16px;
}
.admin-stat {
    color: var(--comment);
    font-size: 12px;
}
.admin-stat-val {
    color: var(--cyan);
    font-size: 16px;
    font-weight: 600;
    margin-right: 4px;
}
.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
}
.admin-table thead th {
    color: var(--yellow);
    text-align: left;
    padding: 8px 12px;
    border-bottom: 1px solid var(--green-dark);
    white-space: nowrap;
}
.admin-table tbody td {
    padding: 7px 12px;
    color: var(--white);
    border-bottom: 1px solid rgba(30,58,47,0.4);
}
.admin-table tbody tr:hover td {
    background: rgba(0,255,65,0.03);
}
.admin-user {
    color: var(--cyan);
    font-weight: 500;
}
.admin-online {
    color: var(--green);
}
.admin-offline {
    color: var(--comment);
}
.admin-loading {
    color: var(--comment);
    font-style: italic;
    padding: 20px 0;
}

/* ─── Admin Tabs ─── */
.admin-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--green-dark);
    margin-bottom: 14px;
}
.admin-tab {
    padding: 8px 16px;
    color: var(--comment);
    font-size: 12px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.admin-tab:hover {
    color: var(--white);
}
.admin-tab.active {
    color: var(--cyan);
    border-bottom-color: var(--cyan);
}
.admin-section-header {
    color: var(--yellow);
    font-size: 12px;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
    padding-bottom: 6px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}

/* ─── Admin Search Bar ─── */
.admin-search-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    margin-bottom: 0;
}
.admin-search-bar input {
    background: rgba(0, 255, 65, 0.05);
    border: 1px solid var(--border);
    color: var(--green);
    font-family: 'Fira Code', monospace;
    font-size: 11px;
    padding: 5px 10px;
    border-radius: 3px;
    width: 220px;
    outline: none;
    transition: border-color 0.2s;
}
.admin-search-bar input:focus {
    border-color: var(--cyan);
}
.admin-search-bar input::placeholder {
    color: var(--comment);
    opacity: 0.7;
}
.admin-search-count {
    color: var(--comment);
    font-size: 10px;
    margin-left: 4px;
}

/* ─── Sort Indicators ─── */
.admin-table thead th[onclick] {
    cursor: pointer;
    user-select: none;
    position: relative;
}
.admin-table thead th[onclick]:hover {
    color: var(--cyan);
}
.admin-table thead th.sort-asc::after {
    content: ' \25B2';
    font-size: 9px;
    color: var(--cyan);
}
.admin-table thead th.sort-desc::after {
    content: ' \25BC';
    font-size: 9px;
    color: var(--cyan);
}

/* ─── Grades Tab ─── */
.admin-lab-filters {
    display: flex;
    gap: 6px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}
.admin-lab-btn {
    padding: 4px 10px;
    font-size: 11px;
    color: var(--comment);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
}
.admin-lab-btn:hover {
    color: var(--white);
    border-color: var(--cyan);
}
.admin-lab-btn.active {
    color: var(--cyan);
    border-color: var(--cyan);
    background: rgba(0,212,255,0.08);
}
.admin-detail-btn {
    color: var(--cyan);
    cursor: pointer;
    font-size: 11px;
    border-bottom: 1px dashed var(--cyan);
}
.admin-detail-btn:hover {
    color: var(--white);
}
.admin-back-btn {
    color: var(--cyan);
    cursor: pointer;
    font-size: 12px;
    margin-right: 8px;
}
.admin-back-btn:hover {
    color: var(--white);
}
.grade-a { color: var(--green); }
.grade-b { color: var(--yellow); }
.grade-c { color: var(--red); }

/* ─── Grade Detail ─── */
.grade-detail-columns {
    display: flex;
    gap: 20px;
    margin-bottom: 12px;
}
.grade-tree-col {
    flex: 0 0 45%;
    min-width: 0;
}
.grade-items-col {
    flex: 1;
    min-width: 0;
}
.grade-tree {
    font-size: 11px;
    color: var(--white);
    background: rgba(10,14,20,0.5);
    padding: 10px;
    border: 1px solid var(--border);
    overflow-x: auto;
    max-height: 400px;
    overflow-y: auto;
    line-height: 1.5;
    white-space: pre;
}
.grade-items {
    max-height: 400px;
    overflow-y: auto;
}
.grade-item {
    font-size: 11px;
    padding: 3px 0;
    border-bottom: 1px solid rgba(30,58,47,0.2);
}
.item-ok { color: var(--green); }
.item-warn { color: var(--yellow); }
.item-miss { color: var(--red); opacity: 0.8; }
.grade-item-name {
    font-family: 'Fira Code', monospace;
}
.grade-item-pts {
    color: var(--comment);
    font-size: 10px;
    margin-left: 6px;
}
.grade-feedback {
    font-size: 11px;
    color: var(--red);
    opacity: 0.9;
    padding: 2px 0 2px 8px;
}

/* ─── Per-file commit dates in admin detail ─── */
.file-commit-date {
    font-size: 10px;
    margin-top: 2px;
    padding-left: 22px;
    font-family: 'Fira Code', monospace;
}
.file-ontime { color: var(--green); opacity: 0.8; }
.file-late { color: var(--red); font-weight: bold; }

/* ─── Leaderboard ─── */
.leaderboard-table .rank-cell {
    text-align: center;
    font-size: 14px;
}
.leaderboard-me {
    background: rgba(0, 255, 65, 0.08);
    border-left: 2px solid var(--green);
}

/* ─── Deadline Countdowns (sidebar) ─── */
.deadline-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 0;
    font-size: 11px;
    font-family: 'Fira Code', monospace;
    flex-wrap: wrap;
}
.deadline-lab {
    color: var(--cyan);
    min-width: 38px;
    font-weight: bold;
    font-size: 10px;
}
.deadline-time { font-weight: bold; }
.deadline-ok .deadline-time { color: var(--green); }
.deadline-warn .deadline-time { color: var(--yellow); }
.deadline-urgent .deadline-time { color: #ff6b35; animation: deadline-blink 1s step-end infinite; }
.deadline-overdue .deadline-time { color: var(--red); }
.deadline-penalty {
    color: var(--red);
    font-size: 10px;
    opacity: 0.85;
}
@keyframes deadline-blink {
    50% { opacity: 0.4; }
}

/* ─── Deadline Tag (inside lab card) ─── */
.lab-deadline-tag {
    font-size: 10px;
    padding: 3px 8px;
    margin-bottom: 6px;
    border-radius: 2px;
    font-family: 'Fira Code', monospace;
}
.lab-deadline-tag.deadline-warn {
    background: rgba(255, 213, 0, 0.08);
    border-left: 2px solid var(--yellow);
    color: var(--yellow);
}
.lab-deadline-tag.deadline-overdue {
    background: rgba(255, 85, 85, 0.08);
    border-left: 2px solid var(--red);
    color: var(--red);
}

/* ─── Student Deadline Info (My Grades) ─── */
.lab-deadline-info {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    padding: 6px 10px;
    margin-bottom: 6px;
    font-size: 11px;
    border-left: 2px solid var(--border);
    background: rgba(10, 14, 20, 0.4);
}
.lab-deadline-info.deadline-ok {
    border-left-color: var(--green);
}
.lab-deadline-info.deadline-warn {
    border-left-color: var(--yellow);
    background: rgba(255, 204, 0, 0.04);
}
.lab-deadline-info.deadline-urgent {
    border-left-color: #ff6600;
    background: rgba(255, 102, 0, 0.06);
    animation: blink-border 1s infinite;
}
.lab-deadline-info.deadline-overdue {
    border-left-color: var(--red);
    background: rgba(255, 85, 85, 0.06);
}
.lab-deadline-date {
    color: var(--comment);
}
.lab-deadline-info.deadline-overdue .lab-deadline-date {
    color: var(--red);
    opacity: 0.8;
}
.lab-deadline-countdown {
    color: var(--green);
    font-weight: bold;
    font-variant-numeric: tabular-nums;
}
.lab-deadline-info.deadline-warn .lab-deadline-countdown { color: var(--yellow); }
.lab-deadline-info.deadline-urgent .lab-deadline-countdown { color: #ff6600; }
.lab-deadline-info.deadline-overdue .lab-deadline-countdown { color: var(--red); }

.deadline-refresh-btn {
    float: right;
    background: rgba(0, 212, 255, 0.08);
    border: 1px solid var(--border);
    color: var(--cyan);
    padding: 2px 10px;
    font-family: 'Fira Code', monospace;
    font-size: 10px;
    cursor: pointer;
    transition: all 0.2s;
}
.deadline-refresh-btn:hover {
    background: rgba(0, 212, 255, 0.2);
    border-color: var(--cyan);
    color: var(--white);
}
.deadline-refresh-btn:disabled {
    opacity: 0.5;
    cursor: wait;
}

/* ─── Student Grades View ─── */
.student-summary {
    padding: 10px 14px;
    margin-bottom: 10px;
    border: 1px solid var(--border);
    background: rgba(10, 14, 20, 0.5);
    font-size: 13px;
}
.student-summary-label {
    color: var(--comment);
}
.student-lab-card {
    margin-bottom: 12px;
    padding: 10px 14px;
    border: 1px solid var(--border);
    background: rgba(10, 14, 20, 0.3);
}
.student-lab-header {
    font-size: 13px;
    margin-bottom: 6px;
}
.student-lab-name {
    color: var(--cyan);
    font-weight: bold;
    text-transform: uppercase;
    margin-right: 6px;
}
.student-checklist {
    padding-left: 8px;
    margin-bottom: 4px;
}

/* ─── Admin Deadlines ─── */
.admin-deadline-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
    flex-wrap: wrap;
}
.admin-deadline-lab {
    color: var(--cyan);
    font-weight: bold;
    min-width: 50px;
}
.admin-input {
    background: rgba(10,14,20,0.6);
    border: 1px solid var(--border);
    color: var(--white);
    padding: 4px 8px;
    font-family: 'Fira Code', monospace;
    font-size: 11px;
}
.admin-input:focus {
    border-color: var(--cyan);
    outline: none;
}
.admin-input-sm {
    width: 60px;
}
.admin-btn {
    background: rgba(0,212,255,0.1);
    border: 1px solid var(--cyan);
    color: var(--cyan);
    padding: 6px 14px;
    font-family: 'Fira Code', monospace;
    font-size: 11px;
    cursor: pointer;
    transition: all 0.2s;
}
.admin-btn:hover {
    background: rgba(0,212,255,0.25);
    color: var(--white);
}
.admin-datetime {
    min-width: 200px;
    cursor: pointer;
}
.admin-datetime::-webkit-calendar-picker-indicator {
    filter: invert(0.7) sepia(1) saturate(3) hue-rotate(140deg);
    cursor: pointer;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .contents-page.active { left: 0; bottom: 28px; }
    .contents-layout { flex-direction: column; height: 100%; min-height: 0; }
    .sidebar {
        width: 260px;
        position: fixed;
        left: 0; top: 0; bottom: 0;
        max-height: none;
        border-right: 1px solid var(--border);
        border-bottom: none;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 150;
    }
    .sidebar.open { transform: translateX(0); }
    .mobile-sidebar-toggle { display: flex; }
    .split-pane, .split-pane.side-view {
        flex-direction: column !important;
        overflow-y: auto !important;
        overflow-x: hidden;
        height: 100%;
        min-height: 0;
    }
    .pane-top { flex: none !important; min-height: 35vh; max-height: 50vh; overflow-y: auto; }
    .pane-bottom { flex: 1 1 auto !important; min-height: 45vh; overflow-y: auto; }
    .split-pane.side-view .pane-divider { width: auto; height: 5px; cursor: row-resize; }
    .split-pane.side-view .pane-divider::after { content: '⋯'; }
    .pane-bottom .terminal { height: auto !important; min-height: 100%; }
    .pane-bottom .terminal-body { overflow-y: visible !important; }
    .file-viewer { height: auto !important; min-height: 300px; }
    .file-viewer iframe { min-height: 50vh !important; height: 60vh; }
    .pane-bottom .md-viewer { max-height: none; min-height: 200px; }
    .footer {
        flex-wrap: wrap;
        height: auto;
        min-height: 28px;
        padding: 4px 10px;
        gap: 6px;
        font-size: 10px;
    }
    .footer > span:first-child { display: none; }
    .footer .comment { display: none; }
    .terminal-body { padding: 14px 16px; }
    .ascii-banner pre { font-size: clamp(3px, 2.2vw, 8px); }
    .term-table { display: block; overflow-x: auto; white-space: nowrap; }
    .readme-plain { margin: 40px 8px 30px; border-radius: 6px; }
    .readme-body { padding: 18px 16px 24px; font-size: 14px; }
    .readme-body h1 { font-size: 22px; }
    .readme-body h2 { font-size: 18px; }
    .breadcrumb, .explorer-breadcrumb { font-size: 12px; }
    .layout-toggle { display: none; }
}

@media (max-width: 480px) {
    .ascii-banner pre { font-size: clamp(2.5px, 2vw, 6px); }
    .terminal-body { padding: 10px 12px; font-size: 12px; }
    .login-input { width: 140px; font-size: 12px; }
    .sidebar { width: 240px; }
    .file-list li { padding: 6px 8px; font-size: 12px; gap: 6px; }
    .file-list .fmeta { font-size: 10px; }
    .md-viewer { padding: 14px 12px; font-size: 12px; }
    .readme-body { padding: 14px 12px 20px; font-size: 13px; }
    .file-viewer iframe { min-height: 40vh !important; height: 50vh; }
}

@media (max-width: 600px) {
    .terminal-body { padding: 12px 14px; }
    .ascii-banner pre { font-size: 4px; }
}