/* P26M — problem section.
 * 3-stage escalation showing how PSP fragmentation grows, plus a pain-points list.
 */

.problem {
    position: relative;
    padding-block: var(--section-pad-y);
    background:
        linear-gradient(180deg,
            var(--color-surface) 0%,
            var(--color-base) 40%,
            var(--color-base) 60%,
            var(--color-surface) 100%);
}

.problem__head {
    margin-bottom: var(--space-8);
    max-width: 720px;
}

.problem__stages {
    display: grid;
    gap: var(--space-4);
    grid-template-columns: 1fr;
    margin-bottom: var(--space-7);
}

@media (min-width: 768px) {
    .problem__stages {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-5);
    }
}

.stage {
    position: relative;
    padding: var(--space-6) var(--space-5);
    background: linear-gradient(180deg,
        var(--color-elevated) 0%,
        var(--color-surface) 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: border-color var(--dur-base) var(--ease-out);
    isolation: isolate;
    overflow: hidden;
}

.stage:hover { border-color: var(--color-border-strong); }

.stage__index {
    position: absolute;
    top: var(--space-4);
    right: var(--space-5);
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-tertiary);
    letter-spacing: var(--tracking-wider);
}

.stage__caption {
    margin-top: var(--space-5);
    font-size: var(--fs-sm);
    line-height: 1.55;
    color: var(--color-text-secondary);
    max-width: 30ch;
}

/* Visual: Merchant box on top, PSP boxes below connected by dashed lines. */
.diagram {
    --node-bg: var(--color-overlay);
    --node-border: var(--color-border-strong);
    --node-text: var(--color-text);
    --link: var(--color-border-strong);

    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: var(--space-3) 0;
    min-height: 140px;
}

.diagram__node {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    background: var(--node-bg);
    border: 1px solid var(--node-border);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--node-text);
    letter-spacing: 0.04em;
    white-space: nowrap;
}
.diagram__node--merchant {
    background: var(--color-elevated);
    border-color: var(--color-border-strong);
    color: var(--color-text);
    font-weight: 600;
}
.diagram__node--psp {
    background: var(--color-base);
    border-color: var(--color-border);
    color: var(--color-text-secondary);
}

.diagram__rail {
    width: 1px;
    height: 18px;
    background: linear-gradient(180deg, var(--link), transparent);
    position: relative;
}
.diagram__rail::before {
    content: "";
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(180deg,
        var(--link) 0,
        var(--link) 3px,
        transparent 3px,
        transparent 6px);
}

.diagram__row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    position: relative;
}

/* Branching connector: horizontal line + vertical drops to each PSP. */
.diagram__row--branched {
    padding-top: 14px;
}
.diagram__row--branched::before {
    content: "";
    position: absolute;
    top: 0;
    left: 12%;
    right: 12%;
    height: 1px;
    border-top: 1px dashed var(--link);
}
.diagram__row--branched .diagram__node {
    position: relative;
}
.diagram__row--branched .diagram__node::before {
    content: "";
    position: absolute;
    bottom: 100%;
    left: 50%;
    width: 1px;
    height: 14px;
    background: repeating-linear-gradient(180deg,
        var(--link) 0, var(--link) 3px, transparent 3px, transparent 6px);
}

/* Final stage — multi-PSP chaos */
.diagram__chaos {
    position: relative;
    width: 100%;
    height: 110px;
    display: grid;
    place-items: center;
}
.diagram__chaos .diagram__node--merchant {
    z-index: 2;
}
.diagram__chaos-psp {
    position: absolute;
    padding: 6px 12px;
    background: var(--color-base);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-text-secondary);
}
.diagram__chaos-psp[data-pos="tl"] { top: 0;    left: 12%;  }
.diagram__chaos-psp[data-pos="tr"] { top: 6px;  right: 8%;  }
.diagram__chaos-psp[data-pos="bl"] { bottom: 4px; left: 4%; }
.diagram__chaos-psp[data-pos="br"] { bottom: 0; right: 14%; }
.diagram__chaos-lines {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

/* Pain points callout */
.problem__pains {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
    padding: var(--space-6);
    background: linear-gradient(135deg,
        rgba(239, 68, 68, 0.06) 0%,
        rgba(239, 68, 68, 0.02) 60%,
        var(--color-elevated) 100%);
    border: 1px solid rgba(239, 68, 68, 0.18);
    border-radius: var(--radius-xl);
}
@media (min-width: 768px) {
    .problem__pains {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-5);
    }
}
.pain {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
}
.pain__bullet {
    width: 22px; height: 22px;
    flex-shrink: 0;
    display: grid; place-items: center;
    border-radius: var(--radius-sm);
    background: rgba(239, 68, 68, 0.12);
    color: var(--color-danger);
    margin-top: 2px;
}
.pain__bullet .p26m-icon { width: 12px; height: 12px; }
.pain__title {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
    font-size: var(--fs-base);
}
.pain__body {
    font-size: var(--fs-sm);
    color: var(--color-text-secondary);
    line-height: 1.55;
}