@import url("site-tokens.css");
/* Same-page progressive disclosure; native details works without JavaScript. */
.architecture-heading{text-align:center;max-width:760px;margin:0 auto 48px}
.architecture-heading h2{font-size:clamp(32px,4vw,52px);line-height:1.2;letter-spacing:-.035em;margin:16px 0 20px}
.architecture-heading p,.journey-note{color:var(--muted,var(--color-text-muted))}
.report-journey{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:32px;margin:0;padding:0}
.report-journey>li{position:relative;padding:24px 0;border-top:1px solid var(--border,var(--color-border))}
.report-journey>li:not(:last-child):after{content:'→';position:absolute;right:-24px;top:58px;color:var(--color-text-muted)}
.journey-number{font:500 13px ui-monospace,monospace;color:var(--color-primary)}
.report-journey h3{font-size:21px;margin:16px 0 8px;letter-spacing:-.02em}
.report-journey p{font-size:15px;color:var(--color-text-muted);margin:0}
.journey-note{text-align:center;font-size:15px;margin:16px 0 32px}
.architecture-disclosure>summary{list-style:none;cursor:pointer;text-align:center;width:fit-content;max-width:100%;margin:auto;border-radius:var(--radius-lg)}
.architecture-disclosure>summary::-webkit-details-marker{display:none}
.architecture-disclosure>summary:focus-visible{outline:3px solid var(--color-primary);outline-offset:6px}
.architecture-action{display:inline-flex;align-items:center;gap:20px;background:var(--color-surface-soft);border-radius:var(--radius);padding:12px 14px 12px 24px;font-weight:600;color:var(--color-text);min-height:52px}
.architecture-plus{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--color-primary);color:var(--color-surface);font-size:25px;font-weight:400;line-height:1;transition:transform .2s ease}
.architecture-disclosure>summary:hover .architecture-action{background:var(--color-primary-soft)}
.architecture-hint{display:block;font-size:13px;color:var(--color-text-muted);margin-top:12px}
.architecture-disclosure:not([open]) .when-open,.architecture-disclosure[open] .when-closed{display:none}
.architecture-disclosure[open] .architecture-plus{transform:rotate(45deg)}
.architecture-expanded{margin-top:36px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:40px}
.architecture-expanded header h3{font-size:30px;letter-spacing:-.025em;margin:12px 0}
.architecture-expanded header p{color:var(--color-text-muted);margin:0 0 32px;max-width:760px}
.architecture-flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.architecture-node{position:relative;border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:20px 16px}
.architecture-node:not(:last-child):after{content:'→';position:absolute;right:-21px;top:50%;color:var(--color-text-muted)}
.architecture-node h4{font-size:17px;margin:12px 0 8px}
.architecture-node p{font-size:13px;color:var(--color-text-muted);min-height:40px;margin:0 0 12px}
.architecture-node ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.architecture-node li{font-size:13px;background:var(--color-surface-soft);padding:10px;border-radius:var(--radius-lg)}
.architecture-return{color:var(--color-primary);text-align:center;font-size:14px;padding:20px 0;margin:0}
.architecture-learning{background:var(--color-surface-soft);border:1px dashed var(--color-border-strong);border-radius:var(--radius-lg);padding:24px}
.learning-title{display:flex;gap:12px;align-items:center;margin-bottom:20px;flex-wrap:wrap}
.learning-title h4{font-size:18px;margin:0}.learning-title>span{font-size:12px;border:1px solid var(--color-border-strong);border-radius:var(--radius);padding:2px 10px;color:var(--color-primary)}
.architecture-learning ol{list-style:none;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;padding:0;margin:0}
.architecture-learning li{position:relative}.architecture-learning li:not(:last-child):after{content:'→';position:absolute;right:-20px;top:0;color:var(--color-text-muted)}
.architecture-learning strong{font-size:14px;display:block}.architecture-learning li span{font-size:13px;color:var(--color-text-muted);display:block;margin-top:8px}
.learning-back{font-size:14px;color:var(--color-primary);margin:24px 0 8px}.learning-boundary{font-size:13px;color:var(--color-text-muted);margin:0}
.architecture-foundation{list-style:none;display:flex;flex-wrap:wrap;gap:12px 24px;margin:24px 0;padding:20px 0;border-block:1px solid var(--color-border);font-size:13px;color:var(--color-text-muted)}
.architecture-expanded footer{display:flex;align-items:center;justify-content:space-between;gap:24px;background:none;border:0;padding:0;font-size:13px}
.architecture-expanded footer p{margin:0;color:var(--color-text-muted);max-width:640px}.architecture-expanded footer a{white-space:nowrap;color:var(--color-primary)}
@media(max-width:900px){.architecture-expanded{padding:28px}.architecture-flow{grid-template-columns:repeat(2,minmax(0,1fr))}.architecture-node:nth-child(2):after{display:none}.architecture-learning ol{grid-template-columns:repeat(2,minmax(0,1fr))}.architecture-learning li:nth-child(2):after{display:none}.report-journey{gap:24px}.report-journey h3{font-size:18px}}
@media(max-width:600px){.architecture-heading{margin-bottom:32px}.report-journey{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 24px}.report-journey>li:after{display:none}.report-journey>li{padding:16px 0}.report-journey h3{margin-top:8px}.architecture-expanded{padding:24px 16px;border-radius:var(--radius-lg);margin-top:24px}.architecture-expanded header h3{font-size:25px}.architecture-flow{grid-template-columns:1fr;gap:24px}.architecture-node:not(:last-child):after{content:'↓';display:block;top:auto;bottom:-25px;right:50%}.architecture-node p{min-height:0}.architecture-learning{padding:20px 16px}.architecture-learning ol{grid-template-columns:1fr;gap:24px}.architecture-learning li:not(:last-child):after{content:'↓';display:block;right:0;top:auto;bottom:-22px}.architecture-expanded footer{display:block}.architecture-expanded footer a{display:inline-block;padding-block:14px}.architecture-foundation{display:grid;gap:8px}.architecture-hint{font-size:12px}}
@media(prefers-reduced-motion:reduce){.architecture-plus{transition:none}}