:root,
html[data-theme="dark"] {
  --bg: #1f252d;
  --panel: #27303a;
  --menu: #2b3541;
  --menu-2: #222b35;
  --text: #e8edf3;
  --muted: #b7c1cc;
  --border: #3a4654;
  --hover: #344152;
  --active: #3f5166;
  --canvas-border: #0f141a;
}

html[data-theme="light"] {
  --bg: #f2f5f9;
  --panel: #ffffff;
  --menu: #e8edf3;
  --menu-2: #dde5ee;
  --text: #1b2530;
  --muted: #4b5a6b;
  --border: #c8d3df;
  --hover: #dce6f2;
  --active: #cedced;
  --canvas-border: #aebdcd;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
}

.container {
  width: min(1200px, 92%);
  margin: 0 auto;
}

.topbar {
  background: linear-gradient(90deg, var(--menu), var(--menu-2));
  border-top: 1px solid #44526433;
  border-bottom: 1px solid #12171d33;
}

.topbar-row {
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.nav-link {
  color: var(--text);
  text-decoration: none;
  padding: 1rem 1.1rem;
  border-left: 1px solid rgba(255, 255, 255, .08);
  border-right: 1px solid rgba(0, 0, 0, .2);
  font-weight: 600;
}

.nav-link:hover {
  background: var(--hover);
}

.nav-link.active {
  background: var(--active);
  color: #fff;
}

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 8px;
  padding: .45rem .8rem;
  font-weight: 600;
  cursor: pointer;
}

.theme-toggle:hover {
  background: var(--hover);
}

/* existing mega-menu updated to theme vars */
nav {
  padding: 10px;
}

i {
  font-size: 24px;
}

nav ul {
  list-style-type: none;
  margin: 0;
  padding: 10px;
  overflow: hidden;
  background-color: var(--menu);
}

nav li {
  float: left;
}

.sub-menu,
.dropbtn,
nav li a {
  display: block;
  color: var(--text);
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

nav li a:hover {
  background-color: var(--hover);
}

.dropbtn {
  background-color: var(--menu);
  color: var(--text);
  border: none;
}

.sub-menu {
  padding: 0;
  margin-top: 0;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: var(--panel);
  min-width: 180px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  z-index: 10;
  border: 1px solid var(--border);
}

.dropdown-content a {
  color: var(--text);
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-content a:hover {
  background-color: var(--hover);
}

.dropdown:hover .dropdown-content,
.sub-menu:hover .dropdown-content {
  display: block;
}

.dropdown:hover .dropbtn,
.sub-menu:hover .dropbtn {
  background-color: var(--active);
}

.page-content {
  min-height: 60vh;
  padding: 1.5rem 0 2.5rem;
  display: grid;
  gap: 1rem;
}

.page-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
}

h1,
h2,
h3 {
  text-align: center;
  margin-top: 0;
}

h3 {
  color: var(--muted);
}

iframe {
  border: 2px solid var(--canvas-border);
  display: block;
  margin: 0 auto;
  max-width: 100%;
}

table {
  width: min(700px, 100%);
  margin: 0 auto;
  border-collapse: collapse;
}

th,
td {
  border: 1px solid var(--border);
  padding: 10px;
  text-align: center;
}

ul.game {
  width: min(900px, 95%);
  margin: 0 auto;
  color: var(--muted);
  line-height: 1.45;
}

@media (max-width: 760px) {
  .topbar-row {
    flex-direction: column;
    align-items: stretch;
    padding: .35rem 0;
  }

  .topnav {
    justify-content: center;
  }

  .theme-toggle {
    align-self: center;
    margin-bottom: .35rem;
  }
}