/*
  Design plan
  Subject: แพรวา = วาทยกร (conductor) ของทีม agent -> โลกของ "แผ่นโน้ต/แผนผังงาน": เส้นบาง, วงโคจร, ขั้นบันได
  Color: bg/surface/text/muted/accent/border + semantic zone colors แยกจาก accent (เขียว/เหลือง/แดง/ดำ ใช้คู่กับสัญลักษณ์รูปทรง)
  Type: Noto Sans Thai (เนื้อหา+หัวเรื่อง) + Instrument Sans (ตัวละติน) + system mono สำหรับ label; scale 13/15/17/22/30/44
  Layout: คอลัมน์เดียวบนมือถือ, grid 2-3 คอลัมน์บนจอกว้าง, ชิดซ้ายเป็นหลัก, motion เน้นจุดเดียวต่อหน้า (วงโคจร / ฉากอธิบาย)
*/
:root {
  --bg: #f2f5f1;
  --surface: #ffffff;
  --surface-2: #e8efea;
  --text: #14201b;
  --muted: #4f5d56;
  --accent: #0a6b5b;
  --accent-ink: #ffffff;
  --accent-soft: #dcefe9;
  --border: #d5ddd6;
  --focus: #b45309;
  --t0: #0a6b5b;
  --t1: #2a68a8;
  --t2: #a8530b;
  --t3: #7a3350;
  --z-green: #17794a;
  --z-yellow: #a16207;
  --z-red: #c0322a;
  --z-black: #1b1f1d;
  --shadow: 0 1px 2px rgba(20, 32, 27, 0.06);
  --font: "Instrument Sans", "Noto Sans Thai", system-ui, -apple-system, "Segoe UI", Tahoma, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1613;
    --surface: #161f1b;
    --surface-2: #1d2823;
    --text: #e5ebe7;
    --muted: #9eada5;
    --accent: #4fd1b5;
    --accent-ink: #072a23;
    --accent-soft: #17332d;
    --border: #2a3731;
    --focus: #f0a35a;
    --t0: #4fd1b5;
    --t1: #7fb2ea;
    --t2: #f0a35a;
    --t3: #e38aae;
    --z-green: #3fbf7f;
    --z-yellow: #e0b23e;
    --z-red: #ee7a70;
    --z-black: #c9d0cc;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
}
img, svg { max-width: 100%; }
h1, h2, h3 { line-height: 1.35; margin: 0; text-wrap: balance; font-weight: 700; }
h1 { font-size: clamp(30px, 7vw, 44px); letter-spacing: -0.01em; }
h2 { font-size: clamp(22px, 4.5vw, 30px); }
h3 { font-size: 17px; }
p { margin: 0; }
a { color: var(--accent); text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 4px; }

.skip { position: absolute; left: 16px; top: -60px; background: var(--accent); color: var(--accent-ink); padding: 8px 16px; border-radius: var(--r-sm); z-index: 10; }
.skip:focus { top: 8px; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding-inline: 16px; }
@media (min-width: 720px) { .wrap { padding-inline: 32px; } }

/* header / nav */
.site-header { border-bottom: 1px solid var(--border); background: var(--bg); position: sticky; top: 0; z-index: 5; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); text-decoration: none; }
.brand-dot { width: 14px; height: 14px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.nav { display: flex; gap: 4px; }
.nav a { color: var(--muted); text-decoration: none; padding: 8px 12px; border-radius: var(--r-sm); font-size: 15px; }
.nav a:hover { color: var(--text); background: var(--surface-2); }
.nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); font-weight: 600; }

/* sections */
.section { padding-block: 48px; }
@media (min-width: 720px) { .section { padding-block: 72px; } }
.section + .section { border-top: 1px solid var(--border); }
.kicker { font-family: var(--mono); font-size: 13px; letter-spacing: 0.05em; text-transform: uppercase; color: var(--accent); margin-bottom: 8px; }
.lead { font-size: 18px; color: var(--muted); max-width: 62ch; }
.stack { display: flex; flex-direction: column; gap: 16px; }
.stack-lg { display: flex; flex-direction: column; gap: 32px; }
.prose { max-width: 68ch; }

/* hero */
.hero { padding-block: 40px 56px; }
.hero .wrap { display: grid; gap: 32px; align-items: center; }
@media (min-width: 860px) { .hero .wrap { grid-template-columns: 1.15fr 0.85fr; } .hero { padding-block: 72px 88px; } }
.hero-text { display: flex; flex-direction: column; gap: 16px; }
.role { font-size: 19px; color: var(--muted); max-width: 52ch; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { font-family: var(--mono); font-size: 13px; border: 1px solid var(--border); background: var(--surface); padding: 2px 10px; border-radius: 999px; color: var(--muted); }
.hero-art { width: 100%; max-width: 380px; justify-self: center; }
.hero-art svg { width: 100%; height: auto; display: block; }

.orbit-ring { fill: none; stroke: var(--border); stroke-width: 1.5; stroke-dasharray: 3 6; }
.core { fill: var(--accent); }
.core-text { fill: var(--accent-ink); font-family: var(--font); font-weight: 700; font-size: 17px; }
.spin { transform-origin: 180px 180px; animation: spin 28s linear infinite; }
.spin.rev { animation-duration: 44s; animation-direction: reverse; }
.spin.slow { animation-duration: 64s; }
@keyframes spin { to { transform: rotate(360deg); } }
.d0 { fill: var(--t0); } .d1 { fill: var(--t1); } .d2 { fill: var(--t2); } .d3 { fill: var(--t3); }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 8px 20px; border-radius: var(--r-sm); border: 1px solid var(--border); background: var(--surface); color: var(--text); font: inherit; font-weight: 600; font-size: 15px; text-decoration: none; cursor: pointer; transition: background-color 0.18s ease-out, transform 0.18s ease-out; }
.btn:hover { background: var(--surface-2); }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn-primary:hover { background: var(--accent); filter: brightness(1.08); }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* cards */
.grid { display: grid; gap: 16px; }
@media (min-width: 640px) { .grid.c2 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .grid.c3 { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md); padding: 20px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 8px; }
.card h3 { display: flex; gap: 10px; align-items: baseline; }
.card p { color: var(--muted); font-size: 16px; }
.num { font-family: var(--mono); color: var(--accent); font-size: 15px; flex: none; }
.card.wide { grid-column: 1 / -1; }

/* ladder */
.ladder { display: flex; flex-direction: column; gap: 12px; list-style: none; padding: 0; margin: 0; }
.rung { display: grid; grid-template-columns: 76px 1fr; gap: 16px; align-items: start; background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md); padding: 16px; position: relative; }
.rung::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 5px; border-radius: var(--r-md) 0 0 var(--r-md); background: var(--c); }
.rung .badge { font-family: var(--mono); font-weight: 700; font-size: 14px; color: var(--c); padding-left: 8px; }
.rung p { color: var(--muted); font-size: 16px; }
.rung strong { color: var(--text); }
.r0 { --c: var(--t0); } .r1 { --c: var(--t1); } .r2 { --c: var(--t2); } .r3 { --c: var(--t3); }
.note { border-left: 3px solid var(--accent); padding: 4px 0 4px 16px; color: var(--muted); max-width: 68ch; }

/* zone chips */
.zones { display: grid; gap: 12px; }
@media (min-width: 720px) { .zones { grid-template-columns: repeat(2, 1fr); } }
.zone { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; align-items: start; padding: 16px; border-radius: var(--r-md); background: var(--surface); border: 1px solid var(--border); border-left: 5px solid var(--zc); }
.chip { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-weight: 700; font-size: 13px; letter-spacing: 0.05em; padding: 2px 12px 2px 8px; border-radius: 999px; background: var(--zc); color: #fff; white-space: nowrap; align-self: start; }
.zone.green { --zc: var(--z-green); } .zone.yellow { --zc: var(--z-yellow); } .zone.red { --zc: var(--z-red); } .zone.black { --zc: var(--z-black); }
.zone.black .chip { color: var(--bg); }
.zone p { grid-column: 2; color: var(--muted); font-size: 16px; }
.zone .zt { font-weight: 600; font-size: 16px; align-self: center; color: var(--text); }
.shape { width: 12px; height: 12px; flex: none; }
@media (prefers-color-scheme: dark) { .chip { color: #0b120f; } .zone.black .chip { color: #0b120f; } }

.cta { text-align: left; }
.cta .box { background: var(--accent-soft); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 28px 20px; display: flex; flex-direction: column; gap: 16px; align-items: flex-start; }
@media (min-width: 720px) { .cta .box { padding: 40px; } }

/* footer */
.site-footer { border-top: 1px solid var(--border); padding-block: 32px; color: var(--muted); font-size: 15px; }
.site-footer .wrap { display: flex; flex-direction: column; gap: 8px; }

/* ---------- how it works ---------- */
.stage { display: grid; gap: 24px; }
@media (min-width: 900px) { .stage { grid-template-columns: minmax(0, 440px) 1fr; align-items: start; gap: 40px; } }
.scene { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 8px; }
.scene svg { display: block; width: 100%; height: auto; }
.sv text { font-family: var(--font); fill: var(--text); }
.sv .sub { font-size: 11px; fill: var(--muted); }
.sv .lbl { font-size: 13px; font-weight: 700; }
.sv .box { fill: var(--surface); stroke: var(--border); stroke-width: 1.5; transition: stroke 0.25s ease-out; }
.sv .box.hl { stroke: var(--accent); stroke-width: 3; }
.sv .tier { fill: color-mix(in srgb, var(--c) 10%, var(--surface)); stroke: var(--c); stroke-width: 1.5; }
.sv .tier.hl { stroke-width: 3.5; }
.sv .tier-t { fill: var(--c) !important; font-weight: 700; font-size: 13px; font-family: var(--mono); }
.sv .link { stroke: var(--border); stroke-width: 2; stroke-dasharray: 4 5; fill: none; }
.sv .person { fill: var(--muted); }
.sv .praewa-core { fill: var(--accent); }
.sv .on-accent { fill: var(--accent-ink) !important; }
.sv .cardbox { fill: var(--surface); stroke: var(--text); stroke-width: 1.5; }
.sv .card-t { font-size: 11px; font-weight: 600; }
.sv .ok { fill: var(--z-green) !important; font-size: 14px; font-weight: 700; }
.sv .bad { fill: var(--z-red) !important; font-size: 14px; font-weight: 700; }
.sv .req { fill: var(--accent); }
.sv .reply { fill: var(--t2); }
.sv .arrow { stroke: var(--t2); stroke-width: 3; fill: none; }
.sv .arrow-head { fill: var(--t2); }
.sv .arrow-t { fill: var(--t2) !important; font-size: 12px; font-weight: 700; }
.sv .lens { fill: none; stroke: var(--text); stroke-width: 3; }
.sv .lens-fill { fill: var(--accent-soft); }

.sv [data-on] { opacity: 0; transition: opacity 0.35s ease-out; pointer-events: none; }
.sv [data-on].on { opacity: 1; }
.sv [data-at] { transition: transform 0.8s cubic-bezier(0.3, 0.7, 0.2, 1), opacity 0.35s ease-out; }
.sv.snap *, .sv.snap { transition: none !important; }
.sv .sway.on { animation: sway 1.6s ease-in-out infinite; }
@keyframes sway { 0%, 100% { transform: translateX(-4px); } 50% { transform: translateX(6px); } }
.sv .bob.on { animation: bob 1.4s ease-in-out infinite; }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-4px); } }

.panel { display: flex; flex-direction: column; gap: 16px; }
.caption-box { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md); padding: 20px; min-height: 164px; display: flex; flex-direction: column; gap: 8px; border-left: 5px solid var(--accent); }
.step-ind { font-family: var(--mono); font-size: 13px; color: var(--accent); letter-spacing: 0.05em; }
.caption-box h3 { font-size: 20px; }
.caption-box p { color: var(--muted); }
.controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.controls .btn { padding-inline: 14px; }
.dots { display: flex; flex-wrap: wrap; gap: 4px; }
.dot { width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--border); background: var(--surface); color: var(--muted); font: 600 12px var(--mono); cursor: pointer; padding: 0; }
.dot:hover { background: var(--surface-2); }
.dot[aria-current="step"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.progress { height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; }
.progress i { display: block; height: 100%; width: 100%; background: var(--accent); transform-origin: left; transform: scaleX(0); transition: transform 0.4s ease-out; }
.steps-list { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 4px; counter-reset: s; }
.steps-list li { display: grid; grid-template-columns: 28px 1fr; gap: 8px; padding: 8px 12px; border-radius: var(--r-sm); color: var(--muted); font-size: 15px; line-height: 1.6; }
.steps-list li::before { counter-increment: s; content: counter(s); font-family: var(--mono); font-size: 13px; color: var(--muted); }
.steps-list li.cur { background: var(--accent-soft); color: var(--text); }
.steps-list li.cur::before { color: var(--accent); font-weight: 700; }
.steps-list b { color: var(--text); font-weight: 600; }
.steps-list .cap-p { display: none; }

.minis { display: grid; gap: 24px; }
@media (min-width: 900px) { .minis { grid-template-columns: repeat(3, 1fr); } }
.mini { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md); padding: 20px; display: flex; flex-direction: column; gap: 12px; }
.mini svg { width: 100%; height: auto; display: block; }
.mini p, .mini li { color: var(--muted); font-size: 15px; line-height: 1.7; }
.mini ul { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 4px; }
.mini text { font-family: var(--font); }
.mini .nt { fill: #fff; font-weight: 700; font-size: 13px; }
.mini .nt-d { fill: var(--text); font-weight: 700; font-size: 13px; }
.mini .track { stroke: var(--border); stroke-width: 3; stroke-linecap: round; }
.mini .ring { fill: none; stroke: var(--text); stroke-width: 3; opacity: 0; transform-origin: center; transform-box: fill-box; }
.mini .orbit-path { fill: none; stroke: var(--border); stroke-width: 2; stroke-dasharray: 4 6; }
.mini .runner { fill: var(--text); }
.mini .gl { font-size: 11px; font-weight: 700; fill: var(--muted); }

.spin9 { transform-origin: 150px 130px; animation: spin 9s linear infinite; }
.ring1 { animation: pulse 9s ease-out infinite; }
.ring2 { animation: pulse 9s ease-out infinite 3s; }
.ring3 { animation: pulse 9s ease-out infinite 6s; }
@keyframes pulse { 0% { opacity: 1; transform: scale(1); } 22% { opacity: 0.9; transform: scale(1.18); } 33%, 100% { opacity: 0; transform: scale(1.3); } }

.gate { transform-box: fill-box; }
.g1 { transform: translateY(-52px); }
.g2 { animation: lift2 14s ease-in-out infinite; }
.g3 { animation: lift3 14s ease-in-out infinite; }
@keyframes lift2 { 0%, 22% { transform: translateY(0); } 27%, 40% { transform: translateY(-52px); } 46%, 100% { transform: translateY(0); } }
@keyframes lift3 { 0%, 50% { transform: translateY(0); } 55%, 64% { transform: translateY(-52px); } 70%, 100% { transform: translateY(0); } }
.req-dot { animation: travel 14s ease-in-out infinite; }
@keyframes travel {
  0% { transform: translateX(0); opacity: 0; }
  4% { opacity: 1; }
  17% { transform: translateX(120px); }
  24% { transform: translateX(120px); }
  38% { transform: translateX(190px); }
  50% { transform: translateX(190px); }
  62% { transform: translateX(262px); }
  68% { transform: translateX(262px); }
  74% { transform: translateX(244px); }
  80% { transform: translateX(262px); }
  86% { transform: translateX(226px); opacity: 1; }
  94% { transform: translateX(150px); opacity: 0; }
  100% { transform: translateX(0); opacity: 0; }
}
.legend { display: grid; gap: 8px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .req-dot { transform: translateX(0); opacity: 1; }
}

.sv .pbox { fill: var(--accent); stroke: transparent; stroke-width: 4; transition: stroke 0.25s ease-out; }
.sv .pbox.hl { stroke: var(--focus); }
.sv .t0 { --c: var(--t0); } .sv .t1 { --c: var(--t1); } .sv .t2 { --c: var(--t2); } .sv .t3 { --c: var(--t3); }
.sv .tier.hl { filter: none; stroke-width: 4; }
@media (prefers-color-scheme: dark) { .mini .nt { fill: #0b120f; } }
@media (prefers-reduced-motion: reduce) { .steps-list .cap-p { display: block !important; color: var(--muted); } .steps-list li { grid-template-columns: 28px 1fr; } }

/* Mobile: the scene SVG is scaled down (~0.85x), so enlarge its text to stay >= 11px rendered */
@media (max-width: 600px) {
  .sv .sub { font-size: 13.5px; }
  .sv .lbl { font-size: 15.5px; }
  .sv .tier-t { font-size: 15.5px; }
  .sv .card-t { font-size: 13.5px; }
  .sv .arrow-t { font-size: 14.5px; }
  .sv text[font-size="12"] { font-size: 14px; }
}