/* --- Neutral Theme Variables Mapping --- */
:root {
    --rm-background: #09090b;
    --rm-surface: #111317;
    --rm-card: #1c1c1f;
    --rm-border: #24262d;
    --rm-text: #f8fafc;
    --rm-muted: #94a3b8;
    --rm-accent: #2563eb;
    --rm-accent-hover: #1d4ed8;
    --rm-accent-alpha: rgba(37, 99, 235, 0.1);
}

html[data-theme="light"] {
    --rm-background: #fafafa;
    --rm-surface: #ffffff;
    --rm-card: #f4f4f5;
    --rm-border: #e5e7eb;
    --rm-text: #09090b;
    --rm-muted: #71717a;
    --rm-accent: #2563eb;
    --rm-accent-hover: #1d4ed8;
    --rm-accent-alpha: rgba(37, 99, 235, 0.05);
}

/* --- Public Roadmap Detail Page Styles --- */
.roadmap-detail-hero-vertical {
    padding: 30px 0;
    margin-bottom: 40px;
    display: flex;
    gap: 30px;
    align-items: center;
    border-bottom: 1px solid var(--rm-border);
    min-height: 220px;
}

.roadmap-detail-hero-cover-banner {
    width: 280px;
    height: 160px;
    border-radius: 12px;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--rm-border);
}

.roadmap-detail-hero-cover-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.roadmap-detail-hero-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.roadmap-detail-meta-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.roadmap-detail-meta-row .roadmap-date-update {
    font-size: 13px;
    color: var(--rm-muted);
}

.roadmap-detail-hero-content h1 {
    font-size: 32px;
    font-weight: 700;
    color: var(--rm-text);
    margin: 0 0 10px 0;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.roadmap-detail-description {
    font-size: 14px;
    line-height: 1.6;
    color: var(--rm-muted);
    margin-bottom: 16px;
}

.roadmap-detail-stats-row {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--rm-muted);
    margin-bottom: 16px;
}

.roadmap-detail-stats-row .stats-separator {
    color: var(--rm-border);
}

.roadmap-hero-action-btn {
    display: block;
}

/* Sidebar and Main Layout Split (Left Sidebar) */
.roadmap-detail-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    grid-template-areas:
        "outline main";
    gap: 40px;
    align-items: start;
}

.roadmap-sidebar-outline-card {
    grid-area: outline;
    position: sticky;
    top: 90px;
    width: 300px;
}

.roadmap-detail-bottom-card {
    margin-top: 40px;
    width: 100%;
}

.roadmap-main-column {
    grid-area: main;
    min-width: 0;
}

/* Sidebar Content Panel */
.roadmap-course-sidebar {
    background: var(--rm-surface);
    border: 1px solid var(--rm-border);
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
    padding: 24px;
}

.roadmap-sidebar-divider {
    border-top: 1px solid var(--rm-border);
    margin: 20px 0;
}

.roadmap-sidebar-header {
    font-size: 18px;
    font-weight: 600;
    color: var(--rm-text);
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 0;
    letter-spacing: -0.02em;
}

.roadmap-section-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--rm-text);
    margin: 0 0 18px 0;
    display: flex;
    align-items: center;
    gap: 10px;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.roadmap-section-title i {
    color: var(--rm-accent);
}

.roadmap-overview-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.roadmap-overview-list li {
    font-size: 15px;
    font-weight: 400;
    color: var(--rm-muted);
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 0;
    line-height: 1.65;
}

.roadmap-sidebar-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--rm-muted);
    margin-top: 10px;
    flex-shrink: 0;
    opacity: 0.6;
}

/* Module Landing Layout Lists (Book Chapters style) */
.roadmap-detail-module-card {
    background: transparent;
    border-top: 1px solid var(--rm-border);
    padding: 32px 0;
    margin-bottom: 0;
}

.roadmap-detail-module-header {
    padding: 0 0 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.roadmap-detail-module-header-title {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.roadmap-detail-module-header-title span.module-number {
    font-size: 11px;
    font-weight: 700;
    color: var(--rm-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.roadmap-detail-module-header-title h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--rm-text);
    margin: 0;
}

.roadmap-detail-module-header-title p.module-subtitle {
    font-size: 0.85rem;
    color: var(--rm-muted);
    margin: 2px 0 0 0;
}

.roadmap-detail-module-body {
    padding: 0;
}

.roadmap-detail-module-description {
    font-size: 15px;
    line-height: 1.8;
    color: var(--rm-muted);
    margin-bottom: 20px;
}

.roadmap-lessons-list {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--rm-border);
    border-radius: 12px;
    overflow: hidden;
    background: var(--rm-surface);
}

.roadmap-lesson-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--rm-border);
    text-decoration: none !important;
    transition: all 0.15s ease;
}

.roadmap-lesson-row:last-child {
    border-bottom: none;
}

.roadmap-lesson-row:hover {
    background: var(--rm-card);
    transform: translateY(-2px);
}

.roadmap-lesson-row-left {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 0;
}

.lesson-row-thumbnail {
    width: 44px;
    height: 44px;
    border-radius: 8px;
    object-fit: cover;
    flex-shrink: 0;
    border: 1px solid var(--rm-border);
}

.lesson-row-icon-fallback {
    width: 44px;
    height: 44px;
    border-radius: 8px;
    background: var(--rm-card);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--rm-muted);
    flex-shrink: 0;
    border: 1px solid var(--rm-border);
}

.lesson-row-icon-fallback i {
    font-size: 1.1rem;
    color: var(--rm-muted);
}

.roadmap-lesson-title {
    color: var(--rm-text);
    font-size: 16px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
}

.roadmap-lesson-row:hover .roadmap-lesson-row-left i {
    color: var(--rm-accent);
}

.roadmap-lesson-row-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.roadmap-lesson-time {
    font-size: 0.85rem;
    color: var(--rm-muted);
}

.roadmap-lesson-row-right i.fa-chevron-right {
    color: var(--rm-muted);
    font-size: 0.85rem;
}

.roadmap-lesson-row:hover i.fa-chevron-right {
    color: var(--rm-text);
}

/* Sidebar Roadmap Navigation list */
.roadmap-nav-sidebar {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 12px;
}

.roadmap-nav-item {
    display: flex;
    align-items: center;
    font-size: 14px;
    color: var(--rm-muted);
    text-decoration: none !important;
    transition: all 0.2s ease;
    padding: 8px 12px;
    border-radius: 8px;
}

.roadmap-nav-item:hover {
    color: var(--rm-accent);
    background: var(--rm-accent-alpha);
}

.roadmap-nav-number {
    font-size: 11px;
    font-weight: 700;
    color: var(--rm-accent);
    background: var(--rm-accent-alpha);
    padding: 2px 6px;
    border-radius: 4px;
    margin-right: 12px;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.roadmap-nav-item:hover .roadmap-nav-number {
    background: var(--rm-accent);
    color: #ffffff;
}

.roadmap-nav-title {
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}