* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #050505;
  --panel: #101010;
  --muted: #8f8f8f;
  --text: #eaeaea;
  --accent: #ffffff;
  --border: rgba(255,255,255,0.06);
  --tab-bg: #151515;
  --tab-active: #1c1c1c;
  --tab-radius: 6px;
  --nav-height: 96px;
  --top-height: 40px;
  --bottom-height: 56px;
  --tab-height: 28px;
  --tab-gap: 6px;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}

main > nav {
  height: var(--nav-height);
  display: grid;
  grid-template-rows: var(--top-height) var(--bottom-height);
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

main > nav > .top {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: flex-end;
  padding: 6px 10px 0 10px;
  gap: 8px;
}

.tab-wrapper {
  grid-column: 1 / 2;
  display: flex;
  align-items: flex-end;
  gap: var(--tab-gap);
  height: var(--top-height);
  padding-left: 4px;
}

.tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: var(--tab-height);
  padding: 4px 10px;
  background: var(--tab-bg);
  color: var(--text);
  border-radius: var(--tab-radius);
  border: 1px solid var(--border);
  min-width: 120px;
  max-width: 220px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  user-select: none;
  font-size: 12px;
  font-weight: 500;
  align-self: flex-start;
  transition: background 0.15s, border-color 0.15s, transform 0.1s, box-shadow 0.1s;
}

.tab:hover {
  background: #191919;
  box-shadow: 0 2px 6px rgba(0,0,0,0.4);
}

.tab[data-active="true"] {
  background: var(--tab-active);
  border-color: rgba(255,255,255,0.12);
}

.tab.dragging {
  opacity: 0.4;
}

.tab .favicon {
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 16px;
}

.tab .favicon img {
  width: 16px;
  height: 16px;
  display: block;
  border-radius: 2px;
}

.tab .title {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1px;
  color: var(--accent);
  line-height: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tab .closebtn button {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  background: transparent;
  border: none;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  transition: background 0.15s, color 0.15s;
}

.tab .closebtn button svg {
  width: 14px;
  height: 14px;
  stroke-width: 1.8;
}

.tab .closebtn button:hover {
  color: var(--text);
  background: rgba(255,255,255,0.06);
}

.addTab {
  grid-column: 2 / 3;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  height: var(--top-height);
  padding-right: 4px;
}

.addTab button {
  width: 28px;
  height: 28px;
  border-radius: var(--tab-radius);
  background: transparent;
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--muted);
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.addTab button:hover {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border-color: rgba(255,255,255,0.12);
}

main > nav > .bottom {
  display: grid;
  grid-template-columns: 160px 1fr 56px;
  align-items: center;
  gap: 8px;
  padding: 6px 10px 8px 10px;
  border-top: 1px solid rgba(255,255,255,0.04);
}

.beg ul {
  list-style: none;
  display: flex;
  gap: 6px;
  align-items: center;
  padding-left: 4px;
}

.beg ul li {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  color: var(--muted);
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.12s, color 0.12s, transform 0.08s;
}

.beg ul li:hover {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  transform: translateY(-1px);
}

.mid {
  display: flex;
  align-items: center;
  width: 100%;
  justify-self: center;
}

.mid input[type="text"] {
  width: 100%;
  max-width: 100%;
  height: 34px;
  padding: 6px 12px;
  border-radius: 999px;
  background: #151515;
  border: 1px solid rgba(255,255,255,0.10);
  color: var(--text);
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s, background 0.15s;
}

.mid input[type="text"]:focus {
  border-color: rgba(255,255,255,0.25);
  background: #181818;
}

.mid input::placeholder {
  color: var(--muted);
  font-weight: 500;
}

.end {
  display: flex;
  align-items: center;
  justify-content: center;
}

.end button[data-menu] {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
}

.end button[data-menu]:hover {
  background: rgba(255,255,255,0.06);
  color: var(--text);
}

nav svg {
  width: 16px;
  height: 16px;
  display: block;
  stroke: currentColor;
}

main > nav::after {
  content: "";
  display: block;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
  margin-top: -1px;
}

main > .window {
  width: 100%;
  height: calc(100% - var(--nav-height));
}

.frames-container {
  width: 100%;
  height: 100%;
  position: relative;
}

.frames-container iframe {
  display: none;
  width: 100%;
  height: 100%;
  border: none;
}

.frames-container iframe[data-isactive="true"] {
  display: block;
  animation: fadeIn 0.15s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(2px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 720px) {
  .tab {
    min-width: 90px;
    max-width: 150px;
    padding: 4px 8px;
  }

  main > nav > .bottom {
    grid-template-columns: 1fr 48px;
    gap: 6px;
    padding: 8px;
  }

  .beg {
    display: none;
  }

  .mid input[type="text"] {
    width: 100%;
  }
}

.end {
  position: relative;
}

.end * {
  background: transparent;
  border: none;
  color: white;
}

[data-fullscreen] {
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
}

[data-fullscreen]:hover {
  background: rgba(255, 255 ,255, 0.08);
}

.menu-popup {
  position: absolute;
  top: calc(var(--nav-height) / 2 - 20px);
  right: 10px;
  background: #1a1a1a;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  padding: 5px 0;
  width: 180px;
  z-index: 9999;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.menu-popup ul {
  list-style: none;
}

.menu-popup li {
  padding: 5px 5px;
  color: var(--text);
  cursor: pointer;
  transition: background 0.12s;
}

.menu-popup li {
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: row;
  gap: 8px;
}

.menu-popup li:hover {
  background: rgba(255,255,255,0.08);
}