/* ============================================
   Recommended Books — Frontend Styles
   ============================================ */

.rb-page {
    background: var(--color-white);
}

/* Hero */
.rb-hero {
    background: var(--color-primary);
    padding: 64px 0;
    text-align: center;
}

.rb-hero__inner {
    max-width: 700px;
}

.rb-hero h1 {
    color: var(--color-white);
    margin-bottom: 20px;
}

.rb-hero p {
    color: rgb(255 255 255 / 0.9);
    margin-bottom: 16px;
}

.rb-hero p:last-child {
    margin-bottom: 0;
}

/* List section */
.rb-list-section {
    padding: var(--spacing-section) 0;
}

.rb-tier-group {
    margin-bottom: 56px;
}

.rb-tier-group:last-child {
    margin-bottom: 0;
}

.rb-tier-heading {
    margin-bottom: 24px;
}

.rb-empty {
    text-align: center;
    color: var(--color-text-muted);
}

/* Book row */
.rb-book {
    display: flex;
    gap: 28px;
    padding-bottom: 40px;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--color-border);
}

.rb-tier-group .rb-book:last-child {
    padding-bottom: 0;
    margin-bottom: 0;
    border-bottom: none;
}

.rb-book__cover {
    flex: 0 0 140px;
    width: 140px;
}

.rb-book__cover img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-std);
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

.rb-book__cover-placeholder {
    width: 100%;
    aspect-ratio: 3 / 4;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-std);
    color: var(--color-text-muted);
}

.rb-book__body {
    flex: 1;
    min-width: 0;
}

.rb-book__heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.rb-book__title {
    margin: 0;
}

.rb-book__label {
    color: var(--color-accent);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

.rb-book__summary {
    color: var(--color-text-main);
    margin-bottom: 16px;
}

.rb-book__thoughts {
    background: var(--color-bg-light);
    border-left: 3px solid var(--color-primary);
    border-radius: 0 var(--radius-std) var(--radius-std) 0;
    padding: 16px 20px;
}

.rb-book__thoughts-text {
    color: var(--color-text-main);
    font-style: italic;
}

.rb-book__thoughts-text p:last-child {
    margin-bottom: 0;
}

/* Tier badges */
.rb-badge--must-read     { background: rgb(59 130 246 / 0.1); color: var(--color-accent); }
.rb-badge--worth-reading { background: rgb(26 43 73 / 0.08);  color: var(--color-primary); }
.rb-badge--nice-to-have  { background: var(--color-bg-light); color: var(--color-text-muted); border: 1px solid var(--color-border); }

@media (max-width: 768px) {
    .rb-hero { padding: 48px 0; }
    .rb-book { flex-direction: column; gap: 16px; }
    .rb-book__cover { width: 120px; }
    .rb-book__heading { flex-direction: column; align-items: flex-start; gap: 8px; }
}