/* ==========================================================================
   The Rust Book - Simplified :: landing-page styles only.
   Everything outside of the landing (sidebar, typography, code blocks,
   tables, links) is intentionally left to mdBook defaults for a uniform,
   familiar reading experience.
   ========================================================================== */

:root {
    --rs-radius: 10px;
    --rs-radius-sm: 6px;
    --rs-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* --- Reading progress bar (added by theme/site.js) ----------------------- */
#rs-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0;
    background: var(--sidebar-active);
    z-index: 1000;
    transition: width 80ms linear;
    pointer-events: none;
    opacity: 0.85;
}

/* --- Landing: hero ------------------------------------------------------- */
.rs-hero {
    margin: 0.5rem 0 2rem;
    padding: 1.8rem 0 1.4rem;
    border-bottom: 1px solid var(--table-border-color);
}
.rs-hero__eyebrow {
    display: inline-block;
    font-size: 0.82em;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--sidebar-active);
    margin-bottom: 0.6rem;
}
.rs-hero h1 {
    margin: 0 0 0.6rem;
}
.rs-hero__accent {
    color: var(--sidebar-active);
    font-style: italic;
}
.rs-hero p {
    margin: 0 0 1rem;
    max-width: 62ch;
}
.rs-hero__ctas {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 0.8rem;
}
.rs-theme-switcher {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-top: 1rem;
}
.rs-theme-switcher__label,
.rs-theme-switcher__hint {
    font-size: 0.92em;
    color: color-mix(in srgb, var(--fg) 78%, transparent);
}
.rs-theme-btn {
    min-height: 40px;
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid var(--table-border-color);
    background: transparent;
    color: var(--fg);
    font: inherit;
    cursor: pointer;
    transition: background 120ms var(--rs-ease), border-color 120ms var(--rs-ease), color 120ms var(--rs-ease);
}
.rs-theme-btn[aria-pressed="true"] {
    border-color: var(--sidebar-active);
    background: color-mix(in srgb, var(--sidebar-active) 12%, transparent);
}
.rs-theme-btn:focus-visible {
    outline: 2px solid var(--sidebar-active);
    outline-offset: 2px;
}
.rs-btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid var(--table-border-color);
    font-weight: 500;
    text-decoration: none !important;
    transition: background 120ms var(--rs-ease), color 120ms var(--rs-ease);
}
.rs-btn--primary {
    background: var(--sidebar-active);
    color: #fff !important;
    border-color: var(--sidebar-active);
}
.rs-btn--primary:hover {
    filter: brightness(1.08);
}
.rs-btn--ghost {
    color: var(--fg) !important;
    background: transparent;
}
.rs-btn--ghost:hover {
    background: color-mix(in srgb, var(--fg) 6%, transparent);
}
@media (hover: hover) and (prefers-reduced-motion: no-preference) {
    .rs-theme-btn:hover {
        border-color: var(--sidebar-active);
        background: color-mix(in srgb, var(--sidebar-active) 6%, transparent);
    }
}

/* --- Landing: progress bar ---------------------------------------------- */
.rs-progress {
    margin: 1rem 0 1.6rem;
    padding: 10px 14px;
    border: 1px solid var(--table-border-color);
    border-radius: var(--rs-radius-sm);
}
.rs-progress__label {
    display: flex;
    justify-content: space-between;
    font-size: 0.9em;
    margin-bottom: 8px;
}
.rs-progress__bar {
    height: 6px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--fg) 10%, transparent);
    overflow: hidden;
}
.rs-progress__fill {
    display: block;
    height: 100%;
    background: var(--sidebar-active);
    border-radius: 999px;
    width: 84.6%; /* 11 of 13 */
}

/* --- Landing: feature strip --------------------------------------------- */
.rs-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin: 1rem 0 1.6rem;
}
.rs-feature {
    padding: 12px 14px;
    border: 1px solid var(--table-border-color);
    border-radius: var(--rs-radius-sm);
}
.rs-feature__icon {
    display: block;
    margin-bottom: 4px;
}
.rs-feature__title {
    font-weight: 600;
    margin-bottom: 2px;
}
.rs-feature__desc {
    font-size: 0.92em;
    color: color-mix(in srgb, var(--fg) 75%, transparent);
    margin: 0;
}

/* --- Landing: chapter card grid ----------------------------------------- */
.rs-section-title {
    margin: 2rem 0 0.8rem;
}
.rs-chapter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 12px;
    margin: 0 0 1.6rem;
}
.rs-chapter-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 14px 16px;
    border: 1px solid var(--table-border-color);
    border-radius: var(--rs-radius-sm);
    color: var(--fg) !important;
    text-decoration: none !important;
    transition: border-color 120ms var(--rs-ease), background 120ms var(--rs-ease);
}
.rs-chapter-card:hover {
    border-color: var(--sidebar-active);
    background: color-mix(in srgb, var(--sidebar-active) 5%, transparent);
}
.rs-chapter-card__head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    font-size: 0.78em;
    color: color-mix(in srgb, var(--fg) 65%, transparent);
}
.rs-chapter-card__day {
    font-weight: 600;
    color: var(--sidebar-active);
}
.rs-chapter-card__title {
    font-weight: 600;
    margin: 0;
}
.rs-chapter-card__desc {
    font-size: 0.92em;
    color: color-mix(in srgb, var(--fg) 75%, transparent);
    margin: 0;
}
.rs-chapter-card--soon {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
    border-style: dashed;
}

/* --- Responsive --------------------------------------------------------- */
@media (max-width: 720px) {
    .rs-chapter-grid { grid-template-columns: 1fr; }
    .rs-theme-switcher { align-items: flex-start; }
}

/* --- Reduced motion ----------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        transition-duration: 0ms !important;
    }
}