:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --muted: #6b7280;
  --accent: #2563eb;
  --text: #0f172a;
  --max-width: 980px;
  --gutter: 24px;
  --radius: 10px;
}

body {
  background: linear-gradient(180deg, var(--bg), #eef2ff 300px);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  line-height: 1.6;
  margin: 0;
  -webkit-user-select: none;
  -ms-user-select: none;
  -moz-user-select: none;
  user-select: none;
}

header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(6px);
  background: rgba(255,255,255,0.9);
  border-bottom: 1px solid rgba(15,23,42,0.06);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px var(--gutter);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  position: relative;
}

.resources {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0px;
  line-height: 0.7;
}

header nav a {
  position: fixed;
  top: 22px;
  right: 12px;
  z-index: 500; 
  display: inline-block;
  padding: 8px 12px;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  color: #000000;
  border: none;
  text-decoration: none;
  font-weight: 700;
  transition: background .12s ease, transform .08s ease, box-shadow .12s ease;
}
header nav a:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px #2F8EF714;
}
header nav a:focus { outline: 2px solid var(--accent-2); outline-offset: 2px; }


.brand { color: var(--accent); font-weight:700; letter-spacing:0.2px; font-size:1rem; }

.container {
  width: 100%;
  max-width: calc(var(--max-width) + 320px);
  margin: 24px auto;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  padding: 0 var(--gutter);
}

nav.toc {
  position: sticky;
  top: 78px;
  align-self: start;
  height: calc(100vh - 88px);
  padding: 12px;
  background: transparent;
  overflow: auto;
}

nav.toc ul { list-style: none; padding: 0; margin: 0; }
nav.toc a {
  display: block;
  padding: 6px 8px;
  color: var(--muted);
  text-decoration: none;
  border-radius: 6px;
}
nav.toc a:hover, nav.toc a.active {
  background: rgba(37,99,235,0.08);
  color: var(--accent);
}

main { min-width: 0; }
article.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 6px 24px rgba(15,23,42,0.06);
}

.header h1 { margin: 0; font-size: 1.25rem; }
.meta { color: var(--muted); font-size: 0.95rem; margin-bottom: 16px; }

h2 { margin-top: 0; font-size: 1.1rem; color: var(--text); }
h3 { margin-top: 20px; font-size: 1rem; color: var(--text); }

p { margin: 0 0 12px; color: var(--text); }

pre, code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, "Roboto Mono", monospace;
  background: #f3f4f6;
  padding: 8px;
  border-radius: 6px;
  overflow: auto;
}

.section { margin-bottom: 18px; }
details summary { cursor: pointer; padding: 6px 0; }

.top-btn {
  display: none;
  position: fixed;
  right: 18px;
  bottom: 18px;
  background: var(--accent);
  color: white;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
}

@media (max-width: 980px) {
  .container { grid-template-columns: 1fr; padding: 0 14px; }
  nav.toc { position: relative; height: auto; top: 0; order: 2; }
  .top-btn { right: 12px; bottom: 12px; }
}

@media print {
  nav.toc, .top-btn { display: none !important; }
}

:root{
  --bg-1:#fbfdff;
  --bg-2:#f1f5f9;
  --accent-1:#2f8ef7;
  --accent-2:#6ec1ff;
  --muted:#1f2937;
  --panel:#ffffff;
}

*{box-sizing:border-box}
html,body{
  height:100%;
  margin:0;
  -webkit-user-select:text;
  -moz-user-select:text;
  -ms-user-select:text;
  user-select:text;
  -webkit-touch-callout:auto;
  font-family: Segoe UI, Arial, sans-serif;
  background:linear-gradient(180deg,var(--bg-1),var(--bg-2));
  color:var(--muted);
}

header{padding:20px 16px 8px;text-align:center}
h1{margin:0;font-size:2rem;letter-spacing:1px;color:var(--muted)}
h1 a{font-size:0.6rem;margin-left:8px;color:var(--accent-2);font-weight:600;text-decoration:none}
#resource-display{margin-top:10px;font-weight:600}

main{max-width:980px;margin:0 auto;padding:18px}

.button-row{display:flex;gap:18px;justify-content:center;margin-top:8px}
.button-row button{min-width:140px}

button, .upgrades button, .corner-group button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:10px 16px;
  border-radius:10px;
  border:none;
  background:linear-gradient(90deg,var(--accent-1),var(--accent-2));
  color:#000000;
  font-weight:600;
  cursor:pointer;
  box-shadow:0 6px 18px rgba(16,24,40,0.06);
  transition:transform .12s ease,box-shadow .12s;
  text-align:center;
  white-space:nowrap;
}
button:active{transform:scale(.98)}
button:hover{transform:translateY(-3px);box-shadow:0 10px 28px rgba(16,24,40,0.08)}

.upgrades{
  position:fixed;
  left:50%;
  top:56%;
  transform:translate(-50%,-50%);
  width:520px;
  height:520px;
  max-width:92%;
  max-height:92%;
  margin:0;
  padding:0;
  display:block;
  pointer-events:auto;
  z-index:40;
}

.upgrades .upgrade{
  position:absolute;
  transform:translate(-50%,-50%);
  min-width:120px;
  padding:10px 14px;
  font-size:0.98rem;
  z-index:50;
  box-sizing:border-box;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  transition:transform .12s ease,box-shadow .12s;
}

#buy-upgrade { left:50%; top:6%; }
#upgrade-double  { left:86%;  top:22%; }
#upgrade-auto    { left:14%;  top:22%; }
#upgrade-triple   { left:86%;  top:56%; }
#upgrade-boost   { left:14%;  top:56%; }
#upgrade-unknown   { left:50%;  top:72%; }

#svg-lines{
  position:absolute;
  left:0;
  top:0;
  width:100%;
  height:100%;
  pointer-events:none;
  z-index:45;
}

.upgrades .upgrade:hover{
  transform: translate(-50%,-50%) translateY(-6px);
  box-shadow:0 12px 32px rgba(16,24,40,0.10);
}

.corner-group{
  position:fixed;
  right:18px;
  bottom:18px;
  display:flex;
  flex-direction:column;
  gap:8px;
  z-index:120;
  pointer-events:auto;
}
.corner-group button{ min-width:110px; }

.feedback{height:22px;text-align:center;margin-top:6px;color:var(--accent-2);font-weight:600;opacity:0;transition:opacity .18s}
.feedback.show{opacity:1}

.confirm-bar{
  position:fixed;left:50%;bottom:18px;transform:translateX(-50%);background:rgba(255,255,255,0.95);color:var(--muted);padding:12px 18px;border-radius:10px;box-shadow:0 8px 30px rgba(16,24,40,0.06);display:flex;gap:12px;align-items:center;z-index:100;
}
.confirm-bar span{font-weight:600}
.confirm-bar .confirm-actions{display:flex;gap:8px}
.confirm-bar button{min-width:72px;padding:8px 10px}

button[data-desc]{ position:relative; z-index:3; }
button[data-desc]::after{
  content: attr(data-desc);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%) translateY(6px);
  background: rgba(255,255,255,0.98);
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 6px;
  white-space: nowrap;
  font-size: 0.86rem;
  line-height: 1;
  box-shadow: 0 6px 18px rgba(16,24,40,0.06);
  opacity: 0;
  pointer-events: none;
  transition: opacity .12s ease, transform .12s ease;
  border: 1px solid rgba(16,24,40,0.04);
}
button[data-desc]::before{
  content: "";
  position: absolute;
  left: 50%;
  bottom: calc(100% + 2px);
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: rgba(255,255,255,0.98);
  opacity: 0;
  transition: opacity .12s ease;
}
button[data-desc]:hover::after,
button[data-desc]:hover::before {
  opacity: 1;
  transform: translateX(-50%) translateY(5px);
}

.rps-display{
  text-align:center;
  font-size:0.92rem;
  color:var(--muted);
  opacity:0.9;
  margin-top:6px;
}

.rps-row{
  width:100%;
  max-width:420px;
  margin:8px auto 0;
  display:flex;
  justify-content:space-between;
  gap:12px;
  padding:0 8px;
  box-sizing:border-box;
  align-items:center;
}
.rps-display{
  font-size:0.85rem;
  color:var(--muted);
  opacity:0.95;
  font-weight:600;
  background:transparent;
  padding:4px 8px;
  border-radius:6px;
  min-width:120px;
  text-align:center;
}
.rps-auto{ color:var(--muted); }
.rps-total{ color:var(--accent-2); font-weight:700; }

.upgrades{ --hex-radius: 200px; }

#upgrade-new-age {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -200%);
  z-index: 999;
}

#buy-upgrade {
  min-width: 120px;
  padding: 10px 14px;
  font-size: 0.98rem;
  border-radius: 10px;
  box-sizing: border-box;
}

#collect-btn {
  min-width: 220px;
  padding: 16px 24px;
  font-size: 1.08rem;
  border-radius: 12px;
  box-shadow: 0 10px 32px rgba(16,24,40,0.08);
  transform: translateY(-2px);
}

#start-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(16,24,40,0.06);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background: var(--panel);
  color: var(--muted);
  padding: 24px;
  border-radius: 12px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: 0 8px 28px rgba(16,24,40,0.06);
}

.modal-content a {
  color: var(--accent-2);
  text-decoration: underline;
}

.modal-content ul {
  margin: 12px 0;
  padding-left: 20px;
}

#start-close-btn {
  background: linear-gradient(90deg,var(--accent-1),var(--accent-2));
  color: #000000;
  border-radius: 10px;
  padding: 10px 16px;
  font-weight: 600;
  cursor: pointer;
  box-shadow:0 6px 18px rgba(16,24,40,0.06);
  margin-top: 16px;
}

button:focus-visible, a:focus-visible {
  outline: 3px solid rgba(47,142,247,0.12);
  outline-offset: 3px;
}
#start-close-btn:active{transform:scale(.98)}
#start-close-btn:hover{transform:translateY(-3px);box-shadow:0 10px 28px rgba(16,24,40,0.08)}


@media (max-width:900px){
  .upgrades{ width:420px; height:420px; }
  #buy-upgrade    { left:50%; top:6%; }
  #upgrade-double  { left:86%; top:22%; }
  #upgrade-auto    { left:14%; top:22%; }
  #upgrade-triple   { left:86%; top:58%; }
  #upgrade-boost    { left:14%; top:58%; }
  #upgrade-unknown    { left:50%; top:74%; }
  .corner-group{ right:14px; bottom:14px; }
}

@media (max-width:640px){
  .upgrades{ width:320px; height:320px; }
  #buy-upgrade    { left:50%; top:6%; }
  #upgrade-double  { left:84%; top:24%; }
  #upgrade-auto    { left:16%; top:24%; }
  #upgrade-triple   { left:84%; top:60%; }
  #upgrade-boost    { left:16%; top:60%; }
  #upgrade-unknown    { left:50%; top:76%; }
  .upgrades .upgrade{ min-width:100px; padding:8px 10px; font-size:0.92rem; }
  .corner-group{ right:10px; bottom:10px; flex-direction:row; }
  h1 { font-size: 1.6rem; }
  .button-row button { min-width: 100px; padding: 8px 12px; font-size: 0.9rem; }
  .corner-group button { min-width: 80px; padding: 6px 10px; font-size: 0.85rem; }
  #collect-btn { min-width: 180px; padding: 12px 18px; font-size: 0.96rem; }
  .modal-content { padding: 16px; max-width: 90%; font-size: 0.9rem; }
}

#options-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(16,24,40,0.06);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

#options-modal.active {
  display: flex;
}

#options-modal .modal-content {
  background: var(--panel);
  color: var(--muted);
  padding: 24px;
  border-radius: 12px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: 0 8px 28px rgba(16,24,40,0.06);
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 26px;
}
.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0;
  right: 0; bottom: 0;
  background-color: #444;
  transition: 0.3s;
  border-radius: 26px;
}
.slider:before {
  position: absolute;
  content: "";
  height: 20px; width: 20px;
  left: 3px; bottom: 3px;
  background-color: white;
  transition: 0.3s;
  border-radius: 50%;
}
input:checked + .slider {
  background-color: #2f8ef7;
}
input:checked + .slider:before {
  transform: translateX(24px);
}