/* Tutorials page. Palette, radii, and shadows come from CSS/tokens.css (loaded through
   grxivCommon.css in the core bundle); fallbacks mirror the token values. */

.tutorials-page {
    padding: var(--page-head-gap, 2rem) clamp(1rem, 3vw, 3rem) 3rem;
}

/* Hero */

.tutorials-hero {
    background:
        linear-gradient(135deg,
            var(--color-primary-soft, rgba(71, 147, 199, 0.14)) 0%,
            var(--color-surface-muted, #f7fbff) 55%,
            var(--color-surface, #ffffff) 100%);
    border: 1px solid var(--color-border, #d7e3ef);
    border-radius: var(--radius-md, 0.75rem);
    box-shadow: var(--shadow-sm, 0 2px 8px rgba(23, 56, 89, 0.08));
    padding: 2.25rem 2rem 2rem;
    margin-bottom: 1.5rem;
}

.tutorials-eyebrow {
    font-family: monospace;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--color-primary, #4793c7);
    margin-bottom: 0.5rem;
}

.tutorials-title {
    color: var(--color-text-strong, #16384e);
    font-weight: 700;
    letter-spacing: 0.02em;
    margin-bottom: 0.5rem;
}

.tutorials-tagline {
    color: var(--color-text, #1f2a33);
    max-width: 46rem;
    margin-bottom: 1.25rem;
}

.tutorials-hero-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

/* Filter toolbar */

.tutorials-toolbar {
    display: grid;
    grid-template-columns: minmax(14rem, 2fr) minmax(10rem, 1fr) minmax(10rem, 1fr) auto;
    gap: 1rem;
    align-items: end;
    background: var(--color-surface, #ffffff);
    border: 1px solid var(--color-border, #d7e3ef);
    border-radius: var(--radius-md, 0.75rem);
    box-shadow: var(--shadow-sm, 0 2px 8px rgba(23, 56, 89, 0.08));
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}

.tutorials-toolbar-field .form-label {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text-muted, #6c757d);
    margin-bottom: 0.25rem;
}

.tutorials-toolbar-status {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding-bottom: 0.3rem;
    white-space: nowrap;
}

#tutorial-count {
    color: var(--color-text-muted, #6c757d);
    font-size: 0.9rem;
}

.tutorials-clear {
    color: var(--color-primary, #4793c7);
    font-size: 0.9rem;
    text-decoration: none;
    padding: 0 0.25rem;
}

.tutorials-clear:hover,
.tutorials-clear:focus {
    color: var(--color-primary-hover, #60c0dc);
    text-decoration: underline;
}

/* Tutorial cards */

.tutorial-card {
    border: 1px solid var(--color-border, #d7e3ef);
    border-radius: var(--radius-md, 0.75rem);
    box-shadow: var(--shadow-sm, 0 2px 8px rgba(23, 56, 89, 0.08));
    overflow: hidden;
    transition: box-shadow var(--transition-base, 0.2s ease),
        transform var(--transition-base, 0.2s ease);
}

.tutorial-card:hover {
    box-shadow: var(--shadow-md, 0 8px 20px rgba(21, 50, 75, 0.08));
    transform: translateY(-2px);
}

.tutorial-media {
    position: relative;
    aspect-ratio: 16 / 9;
    background: var(--color-text-strong, #16384e);
}

.tutorial-media img,
.tutorial-media iframe.tutorial-embed {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
    object-fit: cover;
    display: block;
}

.tutorial-play {
    position: absolute;
    inset: 0;
    width: 100%;
    padding: 0;
    border: 0;
    background: none;
    cursor: pointer;
}

.tutorial-play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    color: #fff;
    background: rgba(22, 56, 78, 0.75);
    border: 2px solid rgba(255, 255, 255, 0.85);
    transition: background var(--transition-fast, 0.15s ease),
        transform var(--transition-fast, 0.15s ease);
}

.tutorial-play-icon svg {
    margin-left: 3px;
}

.tutorial-play:hover .tutorial-play-icon,
.tutorial-play:focus-visible .tutorial-play-icon {
    background: var(--color-primary, #4793c7);
    transform: translate(-50%, -50%) scale(1.08);
}

.tutorial-play:focus-visible {
    outline: none;
    box-shadow: inset var(--shadow-focus, 0 0 0 2px rgba(71, 147, 199, 0.35));
}

/* "Coming soon" and written-guide panels reuse the header's DNA-sequence motif:
   a dim monospace base strand behind the label. */

.tutorial-coming-soon,
.tutorial-guide-link {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
    background: linear-gradient(135deg, #16384e 0%, #1f5175 100%);
    overflow: hidden;
}

.tutorial-strand {
    position: absolute;
    inset: auto 0 0.5rem 0;
    font-family: monospace;
    font-size: 1rem;
    letter-spacing: 0.35em;
    white-space: nowrap;
    color: rgba(255, 255, 255, 0.14);
    user-select: none;
}

.tutorial-media-label {
    position: relative;
    color: #fff;
    font-weight: 600;
    letter-spacing: 0.05em;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-sm, 0.5rem);
    padding: 0.35rem 0.9rem;
    background: rgba(22, 56, 78, 0.4);
}

.tutorial-guide-link:hover .tutorial-media-label,
.tutorial-guide-link:focus-visible .tutorial-media-label {
    background: var(--color-primary, #4793c7);
    border-color: var(--color-primary, #4793c7);
}

/* Badges */

.tutorial-badges {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
    margin-bottom: 0.6rem;
}

.tutorial-badge {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    border-radius: 999px;
    padding: 0.22rem 0.6rem;
    line-height: 1.2;
}

.tutorial-badge-topic {
    color: var(--color-text-strong, #16384e);
    background: var(--color-primary-soft, rgba(71, 147, 199, 0.14));
    border: 1px solid var(--color-border-strong, #b7c9da);
}

.tutorial-badge-beginner {
    color: var(--color-ok, #14532d);
    background: var(--color-ok-wash, rgba(40, 167, 69, 0.16));
    border: 1px solid var(--color-ok, rgba(40, 167, 69, 0.4));
}

.tutorial-badge-intermediate {
    color: var(--color-run, #16384e);
    background: var(--color-run-wash, rgba(71, 147, 199, 0.18));
    border: 1px solid var(--color-run, rgba(71, 147, 199, 0.45));
}

.tutorial-badge-advanced {
    color: var(--color-err, #5b2333);
    background: var(--color-err-wash, rgba(220, 53, 69, 0.12));
    border: 1px solid var(--color-err, rgba(220, 53, 69, 0.35));
}

.tutorial-duration {
    color: var(--color-text-muted, #6c757d);
    font-size: 0.8rem;
}

.tutorial-card .card-title {
    color: var(--color-text-strong, #16384e);
    margin-bottom: 0.4rem;
}

.tutorial-card .card-text {
    color: var(--color-text, #1f2a33);
    font-size: 0.95rem;
}

/* Empty state */

.tutorials-empty {
    text-align: center;
    background: var(--color-surface, #ffffff);
    border: 1px dashed var(--color-border-strong, #b7c9da);
    border-radius: var(--radius-md, 0.75rem);
    padding: 2.5rem 1.5rem;
    margin-top: 0.5rem;
}

.tutorials-empty-title {
    color: var(--color-text-strong, #16384e);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

/* Help callout */

.tutorials-help {
    margin-top: 2rem;
    background: var(--color-surface-muted, #f7fbff);
    border: 1px solid var(--color-border, #d7e3ef);
    border-left: 4px solid var(--color-primary, #4793c7);
    border-radius: var(--radius-sm, 0.5rem);
    padding: 1.25rem 1.5rem;
}

.tutorials-help h2 {
    color: var(--color-text-strong, #16384e);
}

.tutorials-help p {
    margin-bottom: 0;
}

.tutorials-help a {
    color: var(--color-primary, #4793c7);
}

.tutorials-help a:hover,
.tutorials-help a:focus {
    color: var(--color-primary-hover, #60c0dc);
}

/* Responsive */

@media (max-width: 991px) {
    .tutorials-toolbar {
        grid-template-columns: 1fr 1fr;
    }

    .tutorials-toolbar-search {
        grid-column: 1 / -1;
    }

    .tutorials-toolbar-status {
        grid-column: 1 / -1;
        justify-content: space-between;
        padding-bottom: 0;
    }
}

@media (max-width: 575px) {
    .tutorials-hero {
        padding: 1.5rem 1.25rem;
    }

    .tutorials-toolbar {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {

    .tutorial-card,
    .tutorial-card:hover,
    .tutorial-play-icon {
        transition: none;
        transform: none;
    }
}