@import url('https://fonts.googleapis.com/css2?family=Kanit:wght@400;500;600;700&display=swap');

*{box-sizing:border-box}
:root{
  color-scheme:light;
  --bg:#f3f6fa;
  --surface:#fff;
  --surface-raised:#fff;
  --surface-soft:#f7f9fc;
  --ink:#17283d;
  --muted:#65758a;
  --subtle:#92a0b1;
  --line:#e1e7ef;
  --accent:#2864c5;
  --accent-strong:#1e53a8;
  --accent-soft:#ebf2ff;
  --accent-ring:#2864c533;
  --success:#15946c;
  --danger:#d84c56;
  --shadow:0 8px 24px #2036540a,0 1px 2px #20365408;
  --font-en:Futura,'Futura PT','Century Gothic',sans-serif;
  --font-th:'Kanit','Leelawadee UI','Noto Sans Thai',Tahoma,sans-serif;
  --font-mono:'SFMono-Regular',Consolas,'Liberation Mono',monospace;
  --radius:12px;
  --radius-small:8px;
}
body[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0d1521;
  --surface:#131f2e;
  --surface-raised:#172536;
  --surface-soft:#19283a;
  --ink:#e8eef7;
  --muted:#a3b0c1;
  --subtle:#8191a5;
  --line:#2a3a4d;
  --accent:#76aaff;
  --accent-strong:#95bcff;
  --accent-soft:#1e3556;
  --accent-ring:#76aaff44;
  --success:#42c995;
  --danger:#fa747d;
  --shadow:0 10px 28px #0003,0 1px 2px #0002;
}
html{scroll-behavior:smooth;scroll-padding-top:82px}
body{margin:0;min-width:320px;background:var(--bg);color:var(--ink);font:14px/1.5 var(--font-en);transition:background .2s,color .2s}
body[data-lang="th"]{font-family:var(--font-th)}
body.entry-locked{height:100vh;overflow:hidden}
button,input,select{font:inherit}
button{color:inherit}
[hidden]{display:none!important}

/* Header and navigation */
.topbar{height:68px;position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:32px;padding:0 max(26px,calc((100% - 1400px)/2));background:color-mix(in srgb,var(--surface) 88%,transparent);border-bottom:1px solid color-mix(in srgb,var(--line) 76%,transparent);backdrop-filter:blur(16px)}
.brand{display:flex;align-items:center;min-width:145px;text-decoration:none;color:var(--ink)}
.brand-mark{display:block;width:140px;height:42px;object-fit:contain}
.primary-nav{height:100%;display:flex;align-items:center;gap:7px}
.primary-nav a{height:100%;display:flex;align-items:center;padding:0 13px;border-bottom:2px solid transparent;color:var(--muted);font-size:12px;text-decoration:none;transition:color .15s,border-color .15s}
.primary-nav a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.top-actions{display:flex;align-items:center;gap:9px;margin-left:auto}
.status-pill{display:inline-flex;align-items:center;gap:7px;padding:7px 10px;border:1px solid var(--line);border-radius:99px;background:var(--surface);color:var(--muted);font-size:10px}
.status-dot{width:7px;height:7px;border-radius:50%;background:var(--success);box-shadow:0 0 0 3px color-mix(in srgb,var(--success) 14%,transparent)}
.language-picker select{height:34px;min-width:54px;padding:0 9px;border:1px solid var(--line);border-radius:var(--radius-small);outline:none;background:var(--surface);color:var(--ink);font-size:11px;font-weight:700}
.language-picker select:focus-visible,.icon-button:focus-visible,.button:focus-visible{outline:3px solid var(--accent-ring);outline-offset:2px}
.icon-button{width:36px;height:36px;display:grid;place-items:center;border:1px solid var(--line);border-radius:var(--radius-small);background:var(--surface);color:var(--muted);font-size:19px;cursor:pointer;transition:color .15s,border-color .15s,background .15s}
.icon-button:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}
body.entry-locked .topbar{visibility:hidden;pointer-events:none}

/* Landing and loading screen */
.welcome-screen{position:fixed;inset:0;z-index:10;display:flex;align-items:center;justify-content:center;overflow-x:hidden;overflow-y:auto;padding:clamp(18px,4vh,36px) 20px;background:var(--bg);transition:opacity .24s ease,visibility .24s ease}
.welcome-screen.is-leaving{opacity:0;visibility:hidden;pointer-events:none}
.welcome-panel{width:min(680px,100%);margin:auto;padding:clamp(30px,5vw,54px);border:1px solid color-mix(in srgb,var(--line) 82%,var(--accent));border-top:3px solid var(--accent);border-radius:18px;background:color-mix(in srgb,var(--surface) 94%,transparent);box-shadow:0 22px 60px #17283d12,0 3px 12px #17283d08;backdrop-filter:blur(12px);text-align:center;animation:panel-enter .3s ease-out both}
.welcome-logo{display:block;width:min(250px,70%);height:76px;object-fit:contain;margin:0 auto 28px}
.welcome-panel .eyebrow{margin-bottom:17px}
.welcome-panel h1{max-width:550px;margin:0 auto;color:var(--ink);font-size:clamp(32px,5.5vw,52px);line-height:1.1;letter-spacing:-1.4px}
.welcome-copy{max-width:500px;margin:20px auto 30px;color:var(--muted);font-size:14px}
.welcome-details{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:0 0 32px;color:var(--ink);font-size:12px;text-align:left}
.welcome-feature{min-height:112px;display:flex;flex-direction:column;align-items:flex-start;justify-content:flex-start;gap:13px;padding:15px 14px;border:1px solid var(--line);border-radius:11px;background:color-mix(in srgb,var(--surface-soft) 88%,transparent);color:var(--ink);font-size:13px;font-weight:500;line-height:1.5;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}
.welcome-feature:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--accent) 38%,var(--line));box-shadow:0 7px 18px #17283d0b}
.feature-icon{width:31px;height:31px;display:grid;place-items:center;flex:0 0 31px;border:1px solid color-mix(in srgb,var(--accent) 18%,var(--line));border-radius:9px;background:var(--accent-soft);color:var(--accent)}
.feature-icon svg{width:17px;height:17px;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.enter-button{min-width:230px;min-height:48px;padding:0 19px;font-size:12px;background:linear-gradient(115deg,var(--accent-strong),var(--accent));box-shadow:0 5px 14px color-mix(in srgb,var(--accent) 25%,transparent);transition:transform .18s ease,box-shadow .18s ease,filter .18s ease}
.enter-button svg{width:17px;height:17px;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;transition:transform .18s ease}
.enter-button:hover:not(:disabled){transform:translateY(-3px);filter:brightness(1.08);box-shadow:0 11px 24px color-mix(in srgb,var(--accent) 36%,transparent)}
.enter-button:hover:not(:disabled) svg{transform:translateX(3px)}
.enter-button:active:not(:disabled){transform:translateY(0)}
.welcome-note{margin:23px 0 0;color:var(--subtle);font-size:10px}
.loading-panel{width:min(430px,100%);padding:34px 30px;text-align:center;border:1px solid var(--line);border-radius:14px;background:var(--surface);box-shadow:var(--shadow);animation:panel-enter .2s ease-out both}
.loading-logo{display:block;width:170px;height:52px;object-fit:contain;margin:0 auto 17px}
.loading-panel h2{margin:0;color:var(--ink);font-size:20px}
.loading-panel p{margin:7px 0 18px;color:var(--muted);font-size:12px}
.loading-bar{height:7px;overflow:hidden;border:1px solid var(--line);border-radius:99px;background:var(--surface-soft);text-align:left}
.loading-bar span{display:block;width:0;height:100%;border-radius:inherit;background:var(--accent);transition:width .08s linear}
.loading-panel>small{display:block;margin-top:8px;color:var(--muted);font-size:10px;font-variant-numeric:tabular-nums}
@keyframes panel-enter{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}

/* Main dashboard */
main{width:min(1400px,100%);margin:0 auto;padding:28px 26px 38px}
.intro{margin:0 0 22px}
.eyebrow{margin:0 0 5px;color:var(--muted);font-size:9px;line-height:1.35;font-weight:700;letter-spacing:1px}
.intro h1{margin:0 0 6px;color:var(--ink);font-size:clamp(24px,3vw,32px);font-weight:700;line-height:1.2;letter-spacing:-.55px}
.intro-copy{margin:0;color:var(--muted);font-size:12px}
.stage-badge{display:inline-flex;align-items:center;gap:7px;margin-top:10px;padding:4px 9px;border:1px solid var(--line);border-radius:6px;background:var(--surface-soft);color:var(--muted);font-size:9px;font-weight:600;letter-spacing:.2px}
.stage-badge::before{width:6px;height:6px;border-radius:50%;background:#c18a38;content:""}
.workspace{display:grid;grid-template-columns:292px minmax(0,1fr);align-items:start;gap:15px}
.panel{min-width:0;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow)}
.controls{padding:18px;border-color:color-mix(in srgb,var(--line) 78%,var(--muted));box-shadow:0 8px 24px #2036540c,0 1px 3px #2036540a}
.control-group+.control-group{margin-top:19px;padding-top:18px;border-top:1px solid var(--line)}
.section-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:15px}
.section-heading h2,.section-heading h3{margin:0;color:var(--ink);font-size:15px;line-height:1.3;font-weight:700;letter-spacing:-.2px}
.section-heading h3{font-size:13px}
.section-index{display:grid;place-items:center;width:29px;height:29px;border-radius:8px;background:var(--accent-soft);color:var(--accent);font-size:10px;font-weight:700}
.section-index svg{width:16px;height:16px}
.compact{margin-bottom:7px}
.input-grid,.mix-grid{display:grid;grid-template-columns:1fr 1fr;gap:11px}
.input-grid label,.mix-grid label,.duration-label{position:relative;display:grid;grid-template-columns:1fr auto;align-items:center;column-gap:6px;color:var(--ink);font-size:10px;font-weight:600}
.input-grid label input,.input-grid label select,.mix-grid label input,.duration-label input{grid-column:1/3;width:100%;min-width:0;height:38px;margin-top:5px;padding:0 12px;border:1px solid color-mix(in srgb,var(--line) 68%,var(--muted));border-radius:var(--radius-small);outline:none;background:var(--surface-soft);color:var(--ink);font-size:12px;font-weight:600;box-shadow:inset 0 1px 2px #17283d0a;transition:border-color .15s,box-shadow .15s,background .15s}
.input-grid label input,.input-grid label select{font-size:13px;font-weight:650;font-variant-numeric:tabular-nums}
.input-grid label input:focus,.input-grid label select:focus,.mix-grid label input:focus,.duration-label input:focus{border-color:var(--accent);background:var(--surface);box-shadow:0 0 0 3px var(--accent-ring),0 2px 6px #17283d10}
.input-grid .speed-setting{grid-column:1/-1}
.input-grid label small,.mix-grid label small,.duration-label small{grid-column:2;grid-row:1;color:var(--subtle);font-size:9px;font-weight:400}
.mix-grid{row-gap:9px}
.mix-grid label{font-size:9px}
.mix-grid label input{height:32px;font-size:11px}
.button-row{display:flex;gap:10px;margin-top:16px}
.button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:36px;padding:0 11px;border:1px solid transparent;border-radius:var(--radius-small);cursor:pointer;font-size:10px;font-weight:700;white-space:nowrap;text-decoration:none;transition:transform .14s,background .14s,border-color .14s,box-shadow .14s,color .14s}
.button svg{width:15px;height:15px;flex:0 0 15px}
.button:hover:not(:disabled){transform:translateY(-1px)}
.button:active:not(:disabled){transform:translateY(0)}
.button:disabled{cursor:not-allowed;opacity:.48}
.primary{background:var(--accent);color:#fff;box-shadow:0 3px 8px color-mix(in srgb,var(--accent) 22%,transparent)}
.primary:hover:not(:disabled){background:var(--accent-strong);box-shadow:0 5px 12px color-mix(in srgb,var(--accent) 24%,transparent)}
.secondary{border-color:color-mix(in srgb,var(--accent) 10%,var(--line));background:var(--accent-soft);color:var(--accent)}
.secondary:hover:not(:disabled){border-color:color-mix(in srgb,var(--accent) 35%,var(--line));background:color-mix(in srgb,var(--accent-soft) 72%,var(--surface))}
.outline{border-color:var(--line);background:var(--surface);color:var(--muted)}
.outline:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}
.controls .button-row .button{flex:1;min-height:39px;padding:0 10px}
.controls .button-row .button svg{width:16px;height:16px;flex-basis:16px}
.help-text{margin:0 0 11px;color:var(--muted);font-size:9px;line-height:1.5}

/* Simulation canvas and live metrics */
.simulation-panel{padding:17px;min-width:0}
.simulation-heading{margin-bottom:12px}
.light-state{display:flex;align-items:center;gap:9px;padding:7px 10px;border:1px solid var(--line);border-radius:9px;background:var(--surface-soft)}
.light-state strong{display:block;color:var(--ink);font-size:10px;font-weight:700;letter-spacing:.45px}
.light-state small{display:block;margin-top:1px;color:var(--muted);font-size:9px}
.lamp{width:10px;height:10px;border-radius:50%;background:var(--success);box-shadow:0 0 0 4px color-mix(in srgb,var(--success) 14%,transparent),0 0 10px color-mix(in srgb,var(--success) 30%,transparent)}
.lamp.red{background:var(--danger);box-shadow:0 0 0 4px color-mix(in srgb,var(--danger) 13%,transparent),0 0 10px color-mix(in srgb,var(--danger) 24%,transparent)}
.canvas-wrap{overflow:hidden;border:1px solid color-mix(in srgb,var(--line) 68%,var(--muted));border-radius:var(--radius-small);background:var(--surface-soft);box-shadow:0 4px 12px #17283d12,inset 0 1px 3px #17283d0a}
canvas{display:block;width:100%;height:auto;aspect-ratio:10/3}
.road-meta{display:flex;justify-content:space-between;gap:12px;padding:8px 2px 13px;color:var(--muted);font-size:9px;font-weight:700;letter-spacing:.45px}
.road-meta strong{margin-left:4px;color:var(--ink);letter-spacing:0}
.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.stat{position:relative;min-width:0;min-height:76px;padding:11px 12px;border:1px solid var(--line);border-radius:9px;background:var(--surface-soft);transition:border-color .15s,background .15s,transform .15s}
.stat:hover{transform:translateY(-1px);border-color:color-mix(in srgb,var(--accent) 28%,var(--line));background:var(--surface)}
.stat span,.stat small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.stat>span{padding-right:29px}
.stat span{color:var(--muted);font-size:9px;line-height:1.3}
.stat-icon{position:absolute;top:9px;right:9px;width:24px;height:24px;display:grid;place-items:center;border:1px solid color-mix(in srgb,var(--accent) 15%,var(--line));border-radius:7px;background:var(--accent-soft);color:var(--accent)}
.stat-icon svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.stat strong{display:block;margin:5px 0 2px;color:var(--ink);font-size:22px;font-weight:700;line-height:1.1;letter-spacing:-.35px;font-variant-numeric:tabular-nums}
.stat strong[id]{font-family:var(--font-mono);font-variant-numeric:tabular-nums lining-nums;letter-spacing:-.7px}
.stat small{color:var(--subtle);font-size:8px;line-height:1.3}
.vehicle-legend{display:flex;flex-wrap:wrap;gap:10px;margin-top:11px;color:var(--muted);font-size:9px}
.legend-item{display:inline-flex;align-items:center;gap:5px}
.legend-swatch{width:13px;height:7px;border-radius:3px;background:var(--swatch)}

/* Signal plan experiments and results */
.experiments-section{margin-top:19px}
.experiments-heading{margin:0 0 12px}
.experiments-heading h2{margin:0;color:var(--ink);font-size:17px;line-height:1.3}
.small{color:var(--muted);font-size:9px}
.experiment-layout{display:grid;grid-template-columns:292px minmax(0,1fr);gap:15px;align-items:stretch}
.experiment-controls{padding:17px}
.experiment-controls .section-heading{margin-bottom:9px}
.experiment-controls .help-text{margin-bottom:14px}
.duration-label input{height:38px}
.experiment-actions{display:grid;gap:8px;margin-top:12px}
.experiment-actions .button{width:100%;min-height:38px}
.export{width:100%;margin-top:8px;border-color:var(--line);background:var(--surface-soft);color:var(--muted)}
.export:hover:not(:disabled){border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.status-message{min-height:14px;margin:9px 0 0}
.results-panel{padding:9px 15px 11px}
.table-scroll{overflow:auto}
table{width:100%;min-width:630px;border-collapse:separate;border-spacing:0;text-align:left}
thead{background:var(--surface-soft)}
th{padding:10px 11px;border-bottom:1px solid var(--line);color:var(--muted);font-size:8px;font-weight:700;letter-spacing:.45px;text-transform:uppercase;white-space:nowrap}
th:first-child{border-radius:7px 0 0 0}
th:last-child{border-radius:0 7px 0 0}
td{padding:10px 11px;border-bottom:1px solid var(--line);color:var(--ink);font-size:10px;white-space:nowrap;transition:background .12s}
tbody tr:nth-child(even){background:color-mix(in srgb,var(--surface-soft) 72%,var(--surface))}
tbody tr:hover:not(.empty-row){background:var(--accent-soft)}
td strong{font-weight:700}
.empty-row td{text-align:center;color:var(--muted);white-space:normal;padding:22px 12px}
.remove-plan{width:27px;height:27px;display:grid;place-items:center;border:1px solid transparent;border-radius:6px;background:transparent;color:var(--muted);font-size:17px;cursor:pointer}
.remove-plan:hover{border-color:var(--line);background:var(--surface);color:var(--danger)}

/* Footnotes */
footer{width:min(1400px,100%);display:flex;align-items:flex-end;justify-content:space-between;flex-wrap:wrap;gap:18px;margin:0 auto;padding:0 26px 18px;color:var(--muted);font-size:9px}
.footer-assumptions{max-width:760px;color:var(--subtle);font-size:9px;line-height:1.45}
.footer-assumptions strong{color:var(--muted);font-weight:600}
.footer-assumptions p{margin:2px 0 0}
.footer-meta{display:grid;gap:3px;margin-left:auto;text-align:right}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
body[data-lang="th"] .eyebrow{letter-spacing:.25px}
body[data-lang="th"] .intro h1,body[data-lang="th"] .welcome-panel h1{letter-spacing:0}

@media(max-width:1050px){.workspace{grid-template-columns:270px minmax(0,1fr)}.experiment-layout{grid-template-columns:270px minmax(0,1fr)}.controls,.simulation-panel{padding:14px}.stat{padding:9px}.stat strong{font-size:20px}}
@media(max-width:820px){.topbar{gap:16px;padding:0 18px}.primary-nav{gap:0}.primary-nav a{padding:0 9px}.workspace,.experiment-layout{grid-template-columns:1fr}.controls{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}.control-group+.control-group{margin:0;padding:0 0 0 18px;border-top:0;border-left:1px solid var(--line)}.simulation-panel{padding:15px}.experiment-controls{padding:15px}.experiment-actions{grid-template-columns:1fr 1fr}.experiment-actions .button{width:auto}}
@media(max-width:600px){html{scroll-padding-top:104px}.topbar{height:auto;min-height:94px;display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-rows:56px 34px;gap:0 10px;padding:0 12px 4px}.brand{grid-column:1;grid-row:1;min-width:0}.brand-mark{width:112px;height:34px}.primary-nav{grid-column:1/-1;grid-row:2;display:flex;width:100%;height:34px;justify-content:stretch}.primary-nav a{height:34px;flex:1;justify-content:center;padding:0 10px;border-bottom:1px solid var(--line);font-size:11px}.status-pill{display:none}.top-actions{grid-column:2;grid-row:1;gap:7px}.icon-button{width:40px;height:40px}.language-picker select{height:40px}main{padding:21px 12px 30px}.intro{margin-bottom:17px}.intro h1{font-size:25px}.controls{display:block;padding:14px}.control-group+.control-group{margin-top:17px;padding:16px 0 0;border-top:1px solid var(--line);border-left:0}.controls .button-row{gap:8px}.controls .button-row .button{min-height:43px}.simulation-panel{padding:11px}.section-heading h2{font-size:14px}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.stat{min-height:70px;padding:9px}.stat strong{font-size:18px}.vehicle-legend{gap:7px}.experiments-section{margin-top:15px}.experiments-heading{align-items:flex-start;flex-direction:column;gap:5px}.experiment-actions{grid-template-columns:1fr}.experiment-actions .button{width:100%;min-height:43px}.results-panel{padding:9px 10px}footer{padding:0 12px 14px;font-size:8px}.footer-meta{margin-left:0;text-align:left}}
@media(max-width:600px){.welcome-details{grid-template-columns:1fr;gap:8px}.welcome-feature{min-height:0;flex-direction:row;align-items:center;gap:11px;padding:10px 12px}.welcome-panel{padding:30px 22px}.welcome-logo{height:64px;margin-bottom:23px}.welcome-copy{margin-top:16px;margin-bottom:23px}}
@media(max-width:420px){.button-row{gap:5px}.controls .button{padding:0 7px;font-size:9px}.mix-grid{gap:8px}.road-meta{font-size:8px}.stat span{font-size:8px}.welcome-panel{padding:27px 22px}.welcome-panel h1{font-size:34px}.welcome-copy{font-size:12px}.welcome-details{font-size:11px}.loading-panel{padding:30px 20px}.loading-logo{width:140px;height:43px}}