/* ── PLATFORM ARCHITECTURE PAGE ─────────────────────────── */
.pa { position: relative; overflow: hidden; padding: 60px 0 140px; }
.pa__bg {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(900px 600px at 20% 12%, rgba(59,130,246,0.10), transparent 60%),
    radial-gradient(700px 500px at 80% 88%, rgba(59,130,246,0.06), transparent 60%);
}
.pa .container { position: relative; z-index: 1; }

/* Hero · text + small motion graphic */
.pa__hero { display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: center; margin-bottom: 110px; }
.pa__copy h2.pa__title { font-family: var(--font-display); font-size: clamp(36px, 4.2vw, 56px); line-height: 1.04; letter-spacing: -0.025em; color: var(--ink-100); margin: 18px 0 22px; }
.pa__lead { font-size: 17px; line-height: 1.6; color: var(--ink-70); max-width: 560px; margin-bottom: 32px; }
.pa__lead strong { color: var(--ink-100); font-weight: 600; }
.pa__sig { display: flex; border-top: 1px solid var(--hair); border-bottom: 1px solid var(--hair); padding: 22px 0; margin-bottom: 24px; }
.pa__sig-item { flex: 1; padding-right: 22px; }
.pa__sig-item + .pa__sig-item { border-left: 1px solid var(--hair); padding-left: 22px; }
.pa__sig-num { font-family: var(--font-display); font-size: 30px; font-weight: 600; letter-spacing: -0.02em; color: var(--ink-100); line-height: 1; }
.pa__sig-lab { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-70); margin-top: 8px; }
.pa__chips { display: flex; flex-wrap: wrap; gap: 8px; }
.pa__chip { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-80); border: 1px solid var(--hair); border-radius: 999px; background: rgba(255,255,255,0.015); }
.pa__chip-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); animation: pa-dot 1.8s ease-in-out infinite; }
.pa__chip:nth-child(2) .pa__chip-dot { animation-delay: 0.3s; }
.pa__chip:nth-child(3) .pa__chip-dot { animation-delay: 0.6s; }
.pa__chip:nth-child(4) .pa__chip-dot { animation-delay: 0.9s; }
@keyframes pa-dot { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

/* Compact mini-stack motion graphic on the right of hero */
.pa__motion { position: relative; padding: 14px; }
.pa__panel { border: 1px solid var(--hair); border-radius: 14px; background: linear-gradient(180deg, rgba(8,13,24,0.96), rgba(8,13,24,0.86)); box-shadow: 0 30px 80px -30px rgba(0,0,0,0.6), 0 0 0 1px rgba(59,130,246,0.10), inset 0 1px 0 rgba(255,255,255,0.03); overflow: hidden; }
.pa__panel-bar { display: flex; align-items: center; gap: 10px; padding: 14px 18px; border-bottom: 1px solid var(--hair); background: rgba(255,255,255,0.02); }
.pa__panel-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.pa__panel-dot--r { background: #ff5f57; } .pa__panel-dot--y { background: #febc2e; } .pa__panel-dot--g { background: #28c840; }
.pa__panel-name { margin-left: 12px; font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-70); }
.pa__panel-pill { margin-left: auto; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: #28c840; border: 1px solid rgba(40,200,64,0.4); border-radius: 999px; padding: 4px 10px; display: inline-flex; align-items: center; gap: 6px; }
.pa__panel-pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: #28c840; box-shadow: 0 0 8px #28c840; animation: pa-pulse 1.6s infinite; }
@keyframes pa-pulse { 0%,100%{opacity:1;} 50%{opacity:0.4;} }

/* Mini stack: 5 horizontal layers w/ traveling pulses */
.pa__stack { padding: 18px; display: flex; flex-direction: column; gap: 8px; position: relative; }
.pa__layer { display: grid; grid-template-columns: 38px 1fr auto; gap: 12px; align-items: center; padding: 12px 14px; border: 1px solid rgba(96,165,250,0.18); border-radius: 8px; background: rgba(8,13,24,0.6); position: relative; overflow: hidden; }
.pa__layer::before { content:""; position:absolute; left:-30%; top:0; bottom:0; width:30%; background: linear-gradient(90deg, transparent, rgba(96,165,250,0.18), transparent); animation: pa-sweep 3.6s ease-in-out infinite; }
.pa__layer:nth-child(1)::before { animation-delay: 0s; }
.pa__layer:nth-child(2)::before { animation-delay: 0.5s; }
.pa__layer:nth-child(3)::before { animation-delay: 1.0s; }
.pa__layer:nth-child(4)::before { animation-delay: 1.5s; }
.pa__layer:nth-child(5)::before { animation-delay: 2.0s; }
@keyframes pa-sweep { 0% { left: -30%; } 100% { left: 130%; } }
.pa__layer-tag { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.12em; color: var(--accent); padding: 3px 6px; border: 1px solid rgba(59,130,246,0.4); border-radius: 4px; background: rgba(59,130,246,0.08); text-align: center; }
.pa__layer-name { font-family: var(--font-mono); font-size: 12px; color: var(--ink-100); letter-spacing: 0.04em; }
.pa__layer-sub { font-family: var(--font-mono); font-size: 10px; color: var(--ink-70); letter-spacing: 0.06em; text-transform: uppercase; }

.pa__panel-foot { display: flex; gap: 22px; padding: 14px 20px; border-top: 1px solid var(--hair); background: rgba(255,255,255,0.015); flex-wrap: wrap; }
.pa__metric { display: flex; flex-direction: column; gap: 2px; }
.pa__metric-k { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-70); }
.pa__metric-v { font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-90, var(--ink-80)); }

.pa__float { position: absolute; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-80); background: rgba(8,13,24,0.92); border: 1px solid rgba(96,165,250,0.30); border-radius: 999px; padding: 6px 12px; backdrop-filter: blur(10px); box-shadow: 0 10px 24px -10px rgba(0,0,0,0.6); z-index: 2; animation: pa-float 5s ease-in-out infinite; }
.pa__float--tl { top: -4px; right: -10px; }
.pa__float--tr { top: 38px; left: -14px; animation-delay: 1.6s; }
.pa__float--bl { bottom: 4px; right: -8px; animation-delay: 3s; }
@keyframes pa-float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }

/* Big-block intro */
.pa__intro { padding: 48px 48px; border: 1px solid var(--hair); border-radius: 14px; background: linear-gradient(180deg, rgba(255,255,255,0.018), rgba(255,255,255,0.005)); margin-bottom: 80px; }
.pa__intro h3 { font-family: var(--font-display); font-size: clamp(26px, 2.6vw, 32px); letter-spacing: -0.02em; color: var(--ink-100); margin: 14px 0 18px; line-height: 1.15; }
.pa__intro p { font-size: 15.5px; line-height: 1.65; color: var(--ink-70); max-width: 880px; margin: 0 0 12px; }
.pa__intro p strong { color: var(--ink-100); font-weight: 500; }

/* ──── BIG ANIMATED ARCHITECTURE DIAGRAM (the centerpiece) ──── */
.pa__diagram { position: relative; border: 1px solid var(--hair); border-radius: 14px; background: linear-gradient(180deg, rgba(8,13,24,0.96), rgba(8,13,24,0.86)); box-shadow: 0 30px 80px -30px rgba(0,0,0,0.6), 0 0 0 1px rgba(59,130,246,0.10); overflow: hidden; margin-bottom: 100px; }
.pa__diagram-bar { display: flex; align-items: center; gap: 10px; padding: 14px 20px; border-bottom: 1px solid var(--hair); background: rgba(255,255,255,0.02); }
.pa__diagram-bar .pa__panel-dot--r,
.pa__diagram-bar .pa__panel-dot--y,
.pa__diagram-bar .pa__panel-dot--g { width: 10px; height: 10px; border-radius: 50%; }
.pa__diagram-bar .pa__panel-dot--r { background: #ff5f57; } .pa__diagram-bar .pa__panel-dot--y { background: #febc2e; } .pa__diagram-bar .pa__panel-dot--g { background: #28c840; }
.pa__diagram-name { margin-left: 12px; font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-70); }
.pa__diagram-pill { margin-left: auto; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: #28c840; border: 1px solid rgba(40,200,64,0.4); border-radius: 999px; padding: 4px 10px; display: inline-flex; align-items: center; gap: 6px; }
.pa__diagram-pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: #28c840; box-shadow: 0 0 8px #28c840; animation: pa-pulse 1.6s infinite; }
.pa__diagram-canvas { padding: 22px 22px 24px; position: relative; background: radial-gradient(900px 500px at 50% 50%, rgba(59,130,246,0.06), transparent 70%); }
.pa__diagram-canvas svg { display: block; width: 100%; height: auto; }

/* SVG styling classes */
.pa-svg .z-bg { fill: rgba(59,130,246,0.05); stroke: rgba(96,165,250,0.30); stroke-width: 1; rx: 8; }
.pa-svg .z-bg-strong { fill: rgba(59,130,246,0.12); stroke: rgba(96,165,250,0.55); stroke-width: 1; rx: 8; }
.pa-svg .z-bg-ssp { fill: rgba(59,130,246,0.04); stroke: rgba(96,165,250,0.25); stroke-width: 1; rx: 10; }
.pa-svg .z-bg-inner { fill: rgba(59,130,246,0.08); stroke: rgba(96,165,250,0.35); stroke-width: 1; rx: 6; }
.pa-svg .z-label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; fill: var(--ink-80); font-weight: 600; }
.pa-svg .z-label-em { fill: #93c5fd; }
.pa-svg .z-sub { font-family: var(--font-mono); font-size: 8.5px; letter-spacing: 0.14em; text-transform: uppercase; fill: var(--ink-60); }
.pa-svg .tile { fill: rgba(8,13,24,0.92); stroke: rgba(96,165,250,0.35); stroke-width: 0.8; rx: 5; }
.pa-svg .tile-em { stroke: var(--accent); fill: rgba(59,130,246,0.06); }
.pa-svg .tile-mark { fill: #6ee7b7; }
.pa-svg .tile-mark-ex { fill: #fcd34d; }
.pa-svg .tile-label { font-family: var(--font-mono); font-size: 9px; fill: var(--ink-90); letter-spacing: 0.04em; }
.pa-svg .tile-tag { font-family: var(--font-mono); font-size: 8px; fill: #6ee7b7; letter-spacing: 0.10em; }
.pa-svg .tile-tag-ex { fill: #fcd34d; }
.pa-svg .actor { fill: rgba(8,13,24,0.92); stroke: rgba(96,165,250,0.30); stroke-width: 0.8; rx: 5; }
.pa-svg .actor-label { font-family: var(--font-mono); font-size: 9.5px; fill: var(--ink-80); letter-spacing: 0.04em; }
.pa-svg .flow { stroke: rgba(96,165,250,0.30); stroke-width: 0.8; fill: none; }
.pa-svg .flow-dashed { stroke-dasharray: 2 3; }
.pa-svg .pulse { fill: #7dd3fc; filter: drop-shadow(0 0 4px rgba(125,211,252,0.7)); }
.pa-svg .pulse-strong { fill: var(--accent); filter: drop-shadow(0 0 4px rgba(96,165,250,0.7)); }

/* Diagram footer · scrub controls */
.pa__diagram-foot { display: flex; gap: 22px; padding: 16px 22px; border-top: 1px solid var(--hair); background: rgba(255,255,255,0.015); flex-wrap: wrap; align-items: center; }
.pa__legend { display: flex; gap: 14px; flex-wrap: wrap; }
.pa__legend span { font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-70); letter-spacing: 0.06em; display: inline-flex; align-items: center; gap: 6px; }
.pa__legend span::before { content: ""; width: 8px; height: 8px; border-radius: 50%; }
.pa__legend .lg-if::before { background: #6ee7b7; box-shadow: 0 0 6px #6ee7b7; }
.pa__legend .lg-ex::before { background: #fcd34d; box-shadow: 0 0 6px #fcd34d; }
.pa__legend .lg-data::before { background: #7dd3fc; box-shadow: 0 0 6px #7dd3fc; }
.pa__legend .lg-ctrl::before { background: #c4b5fd; box-shadow: 0 0 6px #c4b5fd; }
.pa__diagram-meta { margin-left: auto; font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-70); letter-spacing: 0.08em; }

/* Walkthrough zones */
.pa__section-head { margin: 0 0 48px; max-width: 880px; }
.pa__zone { margin-bottom: 90px; scroll-margin-top: 80px; }
.pa__zone-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px solid var(--hair); flex-wrap: wrap; }
.pa__zone-num { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; color: var(--accent); border: 1px solid rgba(59,130,246,0.4); background: rgba(59,130,246,0.08); padding: 4px 9px; border-radius: 4px; }
.pa__zone-title { font-family: var(--font-display); font-size: 28px; letter-spacing: -0.015em; color: var(--ink-100); line-height: 1.1; margin: 0; }
.pa__zone-tag { margin-left: auto; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-70); }
.pa__zone-lead { font-size: 15px; line-height: 1.6; color: var(--ink-70); max-width: 820px; margin: 0 0 24px; }
.pa__zone-lead strong { color: var(--ink-100); font-weight: 500; }
.pa__zone-subhead { font-family: var(--font-display); font-size: 17px; color: var(--ink-100); margin: 24px 0 12px; letter-spacing: -0.005em; }
.pa__zone-subhead span { font-family: var(--font-mono); font-size: 10px; color: var(--ink-70); letter-spacing: 0.12em; margin-left: 8px; }

.pa__modules { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.pa__modules--3 { grid-template-columns: repeat(3, 1fr); }
.pa__modules--2 { grid-template-columns: repeat(2, 1fr); }
.pa__mod { border: 1px solid var(--hair); border-radius: 10px; padding: 16px 16px 18px; background: linear-gradient(180deg, rgba(255,255,255,0.018), rgba(255,255,255,0.005)); transition: transform 220ms ease, border-color 220ms ease, background 220ms ease; }
.pa__mod:hover { transform: translateY(-3px); border-color: rgba(59,130,246,0.4); background: linear-gradient(180deg, rgba(59,130,246,0.06), rgba(59,130,246,0.015)); }
.pa__mod-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.pa__mod-name { font-family: var(--font-display); font-size: 14px; font-weight: 600; color: var(--ink-100); letter-spacing: -0.005em; line-height: 1.2; }
.pa__mod-tag { font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.14em; color: #6ee7b7; border: 1px solid rgba(110,231,183,0.45); background: rgba(110,231,183,0.10); padding: 3px 6px; border-radius: 4px; flex-shrink: 0; }
.pa__mod-tag--ex { color: #fcd34d; border-color: rgba(252,211,77,0.45); background: rgba(252,211,77,0.10); }
.pa__mod p { font-size: 12.5px; line-height: 1.5; color: var(--ink-70); margin: 0; }

.pa__actors { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.pa__actor { display: flex; align-items: center; gap: 10px; padding: 12px 14px; border: 1px solid var(--hair); border-radius: 8px; background: rgba(255,255,255,0.015); }
.pa__actor-num { font-family: var(--font-mono); font-size: 10px; color: var(--ink-70); letter-spacing: 0.12em; }
.pa__actor-name { font-family: var(--font-display); font-size: 14px; color: var(--ink-100); font-weight: 500; letter-spacing: -0.005em; }

.pa__standards { display: flex; flex-wrap: wrap; gap: 10px; padding: 22px 26px; border: 1px solid var(--hair); border-radius: 12px; background: rgba(255,255,255,0.015); margin-bottom: 32px; }
.pa__standards-k { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-70); padding-right: 18px; border-right: 1px solid var(--hair); margin-right: 8px; align-self: center; }
.pa__std { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.04em; color: var(--ink-80); padding: 5px 10px; border: 1px solid var(--hair); border-radius: 4px; background: rgba(255,255,255,0.02); }

.pa__closing { font-size: 15.5px; line-height: 1.65; color: var(--ink-70); max-width: 900px; margin: 0; }
.pa__closing strong { color: var(--ink-100); font-weight: 500; }

@media (max-width: 1080px) {
  .pa__hero { grid-template-columns: 1fr; gap: 40px; }
  .pa__modules, .pa__modules--3 { grid-template-columns: repeat(2, 1fr); }
  .pa__actors { grid-template-columns: repeat(2, 1fr); }
  .pa__intro { padding: 32px 24px; }
}
@media (max-width: 640px) {
  .pa { padding: 40px 0 90px; }
  .pa__modules, .pa__modules--3, .pa__modules--2 { grid-template-columns: 1fr; }
  .pa__actors { grid-template-columns: 1fr; }
  .pa__zone-tag { width: 100%; margin: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .pa__chip-dot, .pa__float, .pa__panel-pill::before, .pa__diagram-pill::before, .pa__layer::before, .pa-svg * { animation: none !important; }
}