@keyframes driftLeftRight {
    0% { transform: translateX(-15%); }
    50% { transform: translateX(15%); }
    100% { transform: translateX(-15%); }
}

@keyframes driftRightLeft {
    0% { transform: translateX(15%); }
    50% { transform: translateX(-15%); }
    100% { transform: translateX(15%); }
}

.intro-drift-strip-a {
    width: 33%;
    height: 6rem;
    animation: driftLeftRight 14s ease-in-out infinite;
}

.intro-drift-strip-b {
    width: 50%;
    height: 4rem;
    animation: driftRightLeft 18s ease-in-out infinite;
}

.intro-drift-strip-c {
    width: 25%;
    height: 5rem;
    animation: driftLeftRight 12s ease-in-out infinite;
    animation-delay: 3s;
}

.intro-drift-container {
    max-width: 80rem;
}

.intro-drift-textbox {
    max-width: 48rem;
}

/* v10 - Diagonal Skewed Timeline with Brutalist Borders (no BS analog for skew transform) */
.steps-brutal-skew__row {
    opacity: 0;
    transform: translateX(-1.5rem) skewX(-2deg);
    transition: opacity 500ms ease, transform 500ms ease;
}

.steps-brutal-skew__row.is-visible {
    opacity: 1;
    transform: skewX(-2deg);
}

.steps-brutal-skew__row:nth-child(even) {
    transform: translateX(1.5rem) skewX(2deg);
}

.steps-brutal-skew__row:nth-child(even).is-visible {
    transform: skewX(2deg);
}

.steps-brutal-skew__panel {
    transform: skewX(2deg);
}

.steps-brutal-skew__row:nth-child(even) .steps-brutal-skew__panel {
    transform: skewX(-2deg);
}

.steps-brutal-skew__num {
    transform: skewX(2deg);
}

.steps-brutal-skew__row:nth-child(even) .steps-brutal-skew__num {
    transform: skewX(-2deg);
}

/* fixed-size number badge — no Bootstrap width/height utility beyond w-25/50/75/100 */
.slant-ledger__badge {
    width: 5rem;
    height: 5rem;
}

@media (min-width: 768px) {
    .slant-ledger__badge {
        width: 6rem;
        height: 6rem;
    }
}

/* CTA hover — Bootstrap has no hover: utility variants like Tailwind's hover:bg-*.
   Pre-approved color exception for CTA/pill hover states (theme-token fallback). */
.slant-ledger__cta {
    transition: background-color 200ms ease, color 200ms ease;
}

.slant-ledger__cta:hover {
    background-color: var(--bs-primary, rgb(var(--tw-primary-600, 37 99 235) / 1)) !important;
    color: var(--bs-white, #fff) !important;
}

/* About v10 — tab visibility and active state (no palette in CSS) */

.guide-sq-8  { width: 2rem;   height: 2rem;   flex-shrink: 0; }
.guide-sq-12 { width: 3rem;   height: 3rem;   flex-shrink: 0; }
.guide-sq-16 { width: 4rem;   height: 4rem;   flex-shrink: 0; }
.guide-sq-20 { width: 5rem;   height: 5rem;   flex-shrink: 0; }

.guide-ab10-tab-panel.guide-ab10-tab-panel-hidden {
    display: none;
}

.guide-ab10-tab-btn.guide-ab10-tab-active {
    font-weight: 700;
    transform: translateY(-1px);
}

.guide-ab10-tab-btn.guide-ab10-tab-inactive {
    font-weight: 500;
    opacity: 0.9;
}

.gist-cta-hover {
    transition: background-color 0.2s ease;
}

.gist-cta-hover:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.1);
}

.gist-paper {
    border-radius: 2px;
}

.gist-sq-8  { width: 2rem;   height: 2rem;   flex-shrink: 0; }
.gist-sq-10 { width: 2.5rem; height: 2.5rem; flex-shrink: 0; }
.gist-sq-12 { width: 3rem;   height: 3rem;   flex-shrink: 0; }
.gist-sq-16 { width: 4rem;   height: 4rem;   flex-shrink: 0; }
.gist-sq-20 { width: 5rem;   height: 5rem;   flex-shrink: 0; }

.gist-corner {
    width: 1.75rem;
    height: 1.75rem;
    border-color: var(--bs-primary) !important;
}

.gist-corner--top-start {
    border-top: 2px solid var(--bs-primary);
    border-left: 2px solid var(--bs-primary);
}

.gist-corner--top-end {
    border-top: 2px solid var(--bs-primary);
    border-right: 2px solid var(--bs-primary);
}

.gist-corner--bottom-start {
    border-bottom: 2px solid var(--bs-primary);
    border-left: 2px solid var(--bs-primary);
}

.gist-corner--bottom-end {
    border-bottom: 2px solid var(--bs-primary);
    border-right: 2px solid var(--bs-primary);
}

.gist-paper-lines {
    background-image: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 11px,
        rgba(255, 255, 255, 0.4) 11px,
        rgba(255, 255, 255, 0.4) 12px
    );
}

.gist-meta-header {
    font-size: 0.6rem;
    letter-spacing: 0.25em;
}

.gist-field-label {
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    min-width: 7.5rem;
}

.gist-note-radius {
    border-radius: 0 6px 6px 0;
}

.gist-note-rule {
    border-bottom: 4px solid var(--bs-primary);
}

.gist-divider-rule {
    height: 0.5rem;
    background-color: rgba(var(--bs-primary-rgb), 0.06);
    border-top: 2px solid rgba(var(--bs-primary-rgb), 0.35);
    border-bottom: 2px solid rgba(var(--bs-primary-rgb), 0.35);
}

.gist-seal-text {
    font-size: 0.5rem;
    letter-spacing: 0.05em;
}

.gist-footer-meta {
    font-size: 0.55rem;
    letter-spacing: 0.1em;
}

.gist-dot {
    width: 0.25rem;
    height: 0.25rem;
}