/* Labs Layout */
.labs-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
    padding-top: 52px;
}

.labs-sidebar {
    background: var(--bg-alt);
    border-right: 1px solid var(--border);
    padding: 1.5rem 0;
    overflow-y: auto;
    position: sticky;
    top: 52px;
    height: calc(100vh - 52px);
}
.sidebar-header { padding: 0 1.25rem 1rem; border-bottom: 1px solid var(--border); margin-bottom: 0; }
.sidebar-header h2 { font-size: 1rem; font-weight: 600; color: var(--accent); }

/* Bucket Name Input */
.bucket-input-section {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1rem;
}
.bucket-input-section label {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.4rem;
}
.bucket-input-section input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 0.8rem;
    font-family: 'JetBrains Mono', monospace;
    outline: none;
    transition: border-color 0.2s;
}
.bucket-input-section input:focus { border-color: var(--accent); }
.bucket-input-section input::placeholder { color: #555; }
.bucket-input-section small { display: block; margin-top: 0.35rem; font-size: 0.65rem; color: #666; }

.lab-list { display: flex; flex-direction: column; gap: 0.25rem; padding: 0 0.75rem; }
.lab-list-item {
    display: flex; align-items: flex-start; gap: 0.75rem;
    padding: 0.6rem 0.75rem; border-radius: 8px;
    cursor: pointer; transition: background 0.15s;
    text-decoration: none; color: var(--text);
}
.lab-list-item:hover { background: var(--surface); }
.lab-list-item.active { background: rgba(255,153,0,0.08); border-left: 3px solid var(--accent); }
.lab-list-num { font-size: 0.7rem; font-weight: 700; color: var(--accent); min-width: 20px; padding-top: 2px; }
.lab-list-title { font-size: 0.8rem; color: var(--text-muted); line-height: 1.4; }
.lab-list-item.active .lab-list-title { color: var(--text); font-weight: 500; }

/* Step sidebar items */
.step-list-item {
    display: flex; align-items: flex-start; gap: 0.5rem;
    padding: 0.5rem 0.75rem 0.5rem 1.5rem; border-radius: 6px;
    cursor: pointer; transition: background 0.15s;
    font-size: 0.75rem; color: var(--text-muted);
}
.step-list-item:hover { background: var(--surface); color: var(--text); }
.step-list-item.active { color: var(--accent); font-weight: 500; }
.step-list-num { min-width: 16px; font-weight: 600; }

/* Labs Main */
.labs-main { padding: 2rem 3rem 4rem; overflow-y: auto; }

.labs-hero { margin-bottom: 2rem; }
.labs-hero h1 { font-size: 2rem; font-weight: 700; margin-bottom: 0.5rem; }
.labs-hero p { color: var(--text-muted); font-size: 1rem; }

/* Lab Cards */
.lab-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.5rem; }
.lab-card {
    background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
    padding: 1.75rem; cursor: pointer; transition: transform 0.2s, border-color 0.2s;
}
.lab-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.lab-card-num { font-size: 0.7rem; font-weight: 700; color: var(--accent); letter-spacing: 1px; text-transform: uppercase; margin-bottom: 0.5rem; }
.lab-card h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
.lab-card p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 1rem; }
.lab-card-meta { display: flex; gap: 1rem; font-size: 0.75rem; color: var(--text-muted); }
.lab-card-meta span { display: flex; align-items: center; gap: 0.35rem; }

/* Step View */
.step-breadcrumb {
    font-size: 0.8rem; color: var(--text-muted); margin-bottom: 1.5rem;
    display: flex; align-items: center; gap: 0.5rem;
}
.step-breadcrumb a { color: var(--accent); text-decoration: none; }
.step-breadcrumb a:hover { text-decoration: underline; }

.step-overview {
    padding: 1.25rem 1.5rem; margin-bottom: 1.5rem;
    background: rgba(255,153,0,0.04); border: 1px solid rgba(255,153,0,0.15);
    border-radius: 10px;
}
.step-overview-label { font-size: 0.7rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 0.5rem; }
.step-overview p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; }

.step-title { font-size: 1.75rem; font-weight: 700; margin-bottom: 1.5rem; }

/* Step Body Content */
.step-body { line-height: 1.8; }
.step-body p { color: var(--text-muted); font-size: 0.92rem; margin-bottom: 1rem; }
.step-body strong { color: var(--text); }
.step-body h3 { font-size: 1.1rem; font-weight: 600; margin: 1.5rem 0 0.75rem; color: var(--text); }

.step-body .code-block {
    background: #0d1117; border: 1px solid var(--border); border-radius: 10px;
    margin: 1rem 0; overflow: hidden; position: relative;
}
.step-body .code-block .code-block-header {
    display: flex; justify-content: flex-end; align-items: center;
    padding: 0.4rem 0.75rem;
    background: rgba(255,255,255,0.02);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.step-body .code-block .copy-btn {
    display: flex; align-items: center; gap: 0.35rem;
    padding: 0.3rem 0.7rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 5px;
    color: var(--text-muted);
    font-size: 0.7rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}
.step-body .code-block .copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.step-body .code-block .copy-btn.copied { border-color: var(--accent-green); color: var(--accent-green); }
.step-body .code-block .copy-icon { font-size: 0.75rem; }
.step-body .code-block pre {
    padding: 1.25rem; overflow-x: auto;
    font-family: 'JetBrains Mono', monospace; font-size: 0.78rem; line-height: 1.7;
    color: #e6edf3; white-space: pre-wrap; word-break: break-word;
}

.step-body .note-box {
    padding: 1rem 1.25rem; margin: 1rem 0;
    background: rgba(255,153,0,0.04); border: 1px solid rgba(255,153,0,0.2); border-radius: 8px;
}
.step-body .note-box .note-label { font-size: 0.7rem; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 0.35rem; }
.step-body .note-box p { margin: 0; font-size: 0.85rem; color: var(--text-muted); }

.step-body ol, .step-body ul {
    padding-left: 1.5rem; margin: 0.75rem 0 1rem; color: var(--text-muted); font-size: 0.88rem;
}
.step-body li { margin-bottom: 0.5rem; line-height: 1.6; }

.step-body table {
    width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.82rem;
}
.step-body table th {
    text-align: left; padding: 0.6rem 1rem; background: var(--surface);
    border: 1px solid var(--border); font-weight: 600; color: var(--text); font-size: 0.75rem;
    text-transform: uppercase; letter-spacing: 0.5px;
}
.step-body table td { padding: 0.6rem 1rem; border: 1px solid var(--border); color: var(--text-muted); }

.step-body .screenshot-placeholder {
    padding: 2rem; margin: 1rem 0; text-align: center;
    background: var(--surface); border: 1px dashed var(--border); border-radius: 8px;
    color: var(--text-muted); font-size: 0.8rem;
}
.step-body .screenshot-placeholder img {
    max-width: 100%; border-radius: 8px; border: 1px solid var(--border);
}

/* Step Navigation */
.step-nav {
    display: flex; align-items: center; justify-content: space-between;
    margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border);
}
.step-counter { font-size: 0.85rem; color: var(--text-muted); }

/* Active lab nav */
.lab-nav-link.active { color: var(--accent) !important; font-weight: 600; }

/* Responsive */
@media (max-width: 900px) {
    .labs-layout { grid-template-columns: 1fr; }
    .labs-sidebar { display: none; }
    .labs-main { padding: 1.5rem; }
}