/**
 * Homepage principles timeline — mini proof visuals + layout
 */

/* ── Timeline shell ── */
.principles-timeline {
    position: relative;
    margin-top: var(--space-8);
}

.principles-timeline__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(1.25rem, 2.5vw, 2rem);
}

.principles-timeline__item {
    position: relative;
    min-width: 0;
}

.principles-timeline__marker {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.35rem;
    height: 2.35rem;
    margin: 0 auto 1.15rem;
    border-radius: 50%;
    border: 1px solid rgba(46, 107, 255, 0.45);
    background: var(--color-surface-2);
    box-shadow: 0 0 0 4px var(--color-bg-base);
}

.principles-timeline__marker span {
    font-family: var(--font-body);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--color-accent-primary-edge);
}

.principles-timeline__item--1 .principles-timeline__marker {
    width: 2.65rem;
    height: 2.65rem;
    border-color: rgba(57, 198, 244, 0.55);
    background: linear-gradient(165deg, rgba(46, 107, 255, 0.18), var(--color-surface-2));
}

.principles-timeline__rail {
    position: absolute;
    top: 1.15rem;
    left: calc(16.666% + 0.5rem);
    right: calc(16.666% + 0.5rem);
    height: 2px;
    z-index: 1;
    pointer-events: none;
    background: linear-gradient(
        90deg,
        rgba(57, 198, 244, 0.15) 0%,
        rgba(46, 107, 255, 0.55) 50%,
        rgba(57, 198, 244, 0.35) 100%
    );
}

.principles-timeline__panel {
    padding: 1.15rem 1.1rem 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-subtle);
    background: var(--color-surface-1);
    box-shadow: var(--shadow-md);
}

.principles-timeline__item--1 .principles-timeline__panel {
    border-color: var(--color-border-strong);
    background: linear-gradient(165deg, var(--color-surface-2) 0%, var(--color-surface-1) 100%);
}

.principles-timeline__panel h3 {
    margin: 0.85rem 0 0.45rem;
    font-family: var(--font-body);
    font-size: var(--type-heading-sm);
    font-weight: 500;
    letter-spacing: -0.01em;
    color: var(--color-text-primary);
}

.principles-timeline__panel p {
    margin: 0;
    font-size: var(--type-body-md);
    line-height: 1.65;
    color: var(--color-text-secondary);
}

/* ── Shared proof frame ── */
.principle-proof {
    width: 100%;
    height: 4.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border-subtle);
    background: linear-gradient(165deg, var(--color-surface-3) 0%, var(--color-surface-2) 100%);
    overflow: hidden;
    box-shadow: inset 0 1px 0 rgba(234, 241, 248, 0.04);
}

.principle-proof__glow-target {
    position: relative;
    z-index: 1;
    isolation: isolate;
}

.principle-proof__glow-target::before {
    content: "";
    position: absolute;
    inset: -0.4rem -0.5rem;
    z-index: -1;
    border-radius: inherit;
    background: radial-gradient(
        circle at 50% 50%,
        rgba(57, 198, 244, 0.28) 0%,
        rgba(46, 107, 255, 0.1) 45%,
        transparent 72%
    );
    filter: blur(5px);
    opacity: 0.85;
    pointer-events: none;
}

/* ── Clarity: notes → spec ── */
.principle-proof-clarity {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 0.35rem;
    height: 100%;
    padding: 0.55rem 0.65rem;
}

.principle-proof-clarity__before {
    position: relative;
    height: 100%;
}

.principle-proof-clarity__note {
    position: absolute;
    display: block;
    border-radius: 0.2rem;
    border: 1px solid rgba(234, 241, 248, 0.12);
    background: rgba(234, 241, 248, 0.06);
}

.principle-proof-clarity__note--a {
    width: 1.65rem;
    height: 1.1rem;
    top: 0.35rem;
    left: 0.15rem;
    transform: rotate(-8deg);
}

.principle-proof-clarity__note--b {
    width: 1.45rem;
    height: 0.95rem;
    top: 1.35rem;
    left: 0.55rem;
    transform: rotate(5deg);
    opacity: 0.75;
}

.principle-proof-clarity__note--c {
    width: 1.2rem;
    height: 0.85rem;
    top: 0.85rem;
    left: 1.45rem;
    transform: rotate(-4deg);
    opacity: 0.55;
}

.principle-proof-clarity__bridge {
    display: flex;
    align-items: center;
    width: 1.25rem;
}

.principle-proof-clarity__bridge-line {
    display: block;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(57, 198, 244, 0.65), rgba(46, 107, 255, 0.85));
    position: relative;
}

.principle-proof-clarity__bridge-line::after {
    content: "";
    position: absolute;
    right: -1px;
    top: 50%;
    width: 0.28rem;
    height: 0.28rem;
    border-top: 1px solid rgba(46, 107, 255, 0.85);
    border-right: 1px solid rgba(46, 107, 255, 0.85);
    transform: translateY(-50%) rotate(45deg);
}

.principle-proof-clarity__after {
    display: grid;
    gap: 0.15rem;
    padding: 0.35rem 0.45rem;
    border-radius: 0.35rem;
    border: 1px solid rgba(46, 107, 255, 0.28);
    background: rgba(46, 107, 255, 0.08);
}

.principle-proof-clarity__after small {
    font-size: 0.58rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
}

.principle-proof-clarity__after strong {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--color-accent-primary-edge);
}

.principle-proof-clarity__lines {
    display: grid;
    gap: 0.18rem;
}

.principle-proof-clarity__lines i {
    display: block;
    height: 0.14rem;
    border-radius: 999px;
    background: rgba(234, 241, 248, 0.18);
}

.principle-proof-clarity__lines i:nth-child(1) {
    width: 92%;
}

.principle-proof-clarity__lines i:nth-child(2) {
    width: 72%;
}

.principle-proof-clarity__lines i:nth-child(3) {
    width: 84%;
}

/* ── Scale: ascending layers ── */
.principle-proof-scale {
    position: relative;
    height: 100%;
    padding: 0.65rem 0.75rem 0.55rem;
}

.principle-proof-scale__layer {
    position: absolute;
    left: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 1.15rem;
    border-radius: 0.3rem;
    border: 1px solid var(--color-border-subtle);
    background: var(--color-surface-1);
    transform: translateX(-50%);
}

.principle-proof-scale__layer small {
    font-size: 0.58rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    color: var(--color-text-secondary);
}

.principle-proof-scale__layer--1 {
    bottom: 0.45rem;
    width: 42%;
    opacity: 0.65;
}

.principle-proof-scale__layer--2 {
    bottom: 1.65rem;
    width: 62%;
    opacity: 0.82;
}

.principle-proof-scale__layer--3 {
    bottom: 2.85rem;
    width: 82%;
    border-color: rgba(46, 107, 255, 0.35);
    background: rgba(46, 107, 255, 0.1);
}

.principle-proof-scale__layer--3 small {
    color: var(--color-accent-primary-edge);
}

.principle-proof-scale__pulse {
    position: absolute;
    right: 0.35rem;
    width: 0.35rem;
    height: 0.35rem;
    border-radius: 50%;
    background: var(--color-accent-primary-edge);
}

/* ── Works: live outcome tracks ── */
.principle-proof-works {
    display: grid;
    grid-template-rows: auto 1fr;
    gap: 0.45rem;
    height: 100%;
    padding: 0.55rem 0.65rem;
}

.principle-proof-works__header {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.principle-proof-works__dot {
    width: 0.42rem;
    height: 0.42rem;
    border-radius: 50%;
    background: var(--color-accent-primary-edge);
    box-shadow: 0 0 0 3px rgba(57, 198, 244, 0.18);
}

.principle-proof-works__header strong {
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    color: var(--color-text-primary);
}

.principle-proof-works__tracks {
    display: grid;
    gap: 0.35rem;
    align-content: center;
}

.principle-proof-works__track {
    display: grid;
    grid-template-columns: 3.25rem 1fr;
    align-items: center;
    gap: 0.4rem;
}

.principle-proof-works__track small {
    font-size: 0.58rem;
    color: var(--color-text-secondary);
}

.principle-proof-works__track span {
    display: block;
    height: 0.22rem;
    width: var(--track-w, 70%);
    border-radius: 999px;
    background: linear-gradient(90deg, rgba(46, 107, 255, 0.35), rgba(57, 198, 244, 0.85));
}

/* ── Responsive ── */
@media (max-width: 991.98px) {
    .principles-timeline__list {
        grid-template-columns: 1fr;
        gap: 0;
        padding-left: 0.35rem;
    }

    .principles-timeline__rail {
        top: 0.65rem;
        bottom: 0.65rem;
        left: 1.5rem;
        right: auto;
        width: 2px;
        height: auto;
        background: linear-gradient(
            180deg,
            rgba(57, 198, 244, 0.35) 0%,
            rgba(46, 107, 255, 0.55) 50%,
            rgba(57, 198, 244, 0.25) 100%
        );
    }

    .principles-timeline__item {
        display: grid;
        grid-template-columns: 3rem minmax(0, 1fr);
        gap: 0.85rem;
        padding-bottom: 1.35rem;
    }

    .principles-timeline__item:last-child {
        padding-bottom: 0;
    }

    .principles-timeline__marker {
        margin: 0;
        align-self: start;
    }

    .principles-timeline__item--1 .principles-timeline__marker {
        width: 2.35rem;
        height: 2.35rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .principle-proof-scale__pulse {
        animation: none !important;
    }
}