:root {
  --bg: #000;
  --frame: #00ff88;
  --text: #fff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Arial", sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
}

/* ===== Topbar ===== */
.topbar {
  background: #111;
  padding: 15px;
  text-align: center;
  border-bottom: 2px solid var(--frame);
}

/* ===== Posts ===== */
.feed {
  padding: 20px;
}
.post-card {
  background: #111;
  border: 1px solid var(--frame);
  border-radius: 15px;
  padding: 15px;
  margin-bottom: 20px;
}
.post-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.post-header .avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  margin-right: 10px;
}
.post-actions {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
}
.post-actions button {
  background: transparent;
  border: none;
  color: var(--frame);
  cursor: pointer;
}

/* ===== Bottom Nav ===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-around;
  background: #111;
  border-top: 2px solid var(--frame);
  padding: 10px 0;
}
.bottom-nav a {
  color: var(--text);
  font-size: 20px;
  text-decoration: none;
}
.plus-btn {
  background: var(--frame);
  color: #000 !important;
  border-radius: 50%;
  padding: 10px;
  margin-top: -25px;
}

/* ===== Responsive Device View ===== */
@media (min-width: 768px) {
  body {
    display: grid;
    grid-template-columns: 250px 1fr;
  }
  .bottom-nav {
    position: fixed;
    flex-direction: column;
    top: 0;
    bottom: 0;
    left: 0;
    width: 80px;
    border-top: none;
    border-right: 2px solid var(--frame);
  }
  .bottom-nav a, .plus-btn {
    margin: 20px auto;
  }
  .feed {
    padding: 40px;
  }
}