body {
  background: url('images/cat-ocean.png') center/cover fixed no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tab {
  display: none;
  position: relative;
  width: 50vw;
  height: 65vh;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 0.6vw;
  padding: 2vw;
  overflow-y: auto;
  z-index: 6;
}

.main-title {
	height:3vh;
	width: 50vw;
	background: rgba(255,255,255,0.8);
	border-radius: 0.6vw;
	padding: 2vw;
	margin-top:2vh;
	margin-bottom: 2vh;
	font-family: 'Courier New', monospace;
	font-weight: 500;
	font-size:2vw;
	
}

.tab::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(#f8f8f8 0 1.2vw, #ececec 1.25vw);
  opacity: 0.3;
  border-radius: 0.6vw;
  pointer-events: none;
}

.box {
	display: flex;
	flex-direction: column;
}

.tab:target {
  display: block;
  animation: fadeIn 0.25s ease;
}

a[href^="#tab"] {
  position: fixed;
  left: calc(50% - 25vw - 8vw + 0.3vw);
  width: 4vw;

  background: #fafafa;
  border: 0.15vw solid #ccc;
  border-right: none;
  border-radius: 0.6vw 0 0 0.6vw;
  padding: 0.6vw 0.8vw;
  box-shadow: -0.4vw 0 1vw rgba(0, 0, 0, 0.1);

  color: #111;
  text-decoration: none;
  font-size: 0.9vw;
  font-weight: 500;

  transition: transform 0.2s ease, background 0.2s ease;
  z-index: 5;
}

a[href="#tab1"] { top: 20vh; background: #fffbf0; }
a[href="#tab2"] { top: 27.5vh; background: #f0f8ff; }
a[href="#tab3"] { top: 35vh; background: #f8f0ff; }

a[href^="#tab"]:hover {
  transform: translateX(-0.6vw);
  background: #fff;
}

#tab1 {
  font-size: 1.1vw;
  line-height: 1.8;
  color: #222;
  font-family: "Courier New", monospace;
}

#tab1 h2 {
  font-size: 1.8vw;
  font-weight: 700;
  text-align: left;
  padding-bottom: 0.6vw;
  border-bottom: 0.15vw solid rgba(0, 0, 0, 0.6);
  width: 100%;
}


#tab1 p {
  font-size: 1.1vw;
}

#tab1 a {
  color: #0056b3;
  text-decoration: none;
  font-weight: 600;
  border-bottom: 0.1vw solid transparent;
  transition: all 0.2s ease-in-out;
}

#tab1 a:hover {
  color: #003e8a;
  border-bottom: 0.1vw solid #003e8a;
  background: rgba(0, 0, 0, 0.05);
  border-radius: 0.3vw;
  padding: 0.1vw 0.4vw;
}

#tab1 strong {
  color: #111;
  font-weight: 600;
}

/* --- Compact link layout with inline descriptions --- */
.link-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.link-list li {
  margin-bottom: 0.6vw;
  line-height: 1.6;
  font-size: 1.05vw;
  color: #222;
}

/* Make <a> and <p> sit inline on same line */
.link-list li a,
.link-list li p {
  display: inline;         /* force inline text flow */
  vertical-align: baseline;
  margin: 0;
}

/* Link styling */
.link-list a {
  font-weight: 600;
  color: #0056b3;
  text-decoration: none;
  border-bottom: 0.1vw solid transparent;
  transition: all 0.2s ease-in-out;
}

.link-list a:hover {
  color: #003e8a;
  border-bottom: 0.1vw solid #003e8a;
  background: rgba(0, 0, 0, 0.05);
  border-radius: 0.3vw;
  padding: 0.1vw 0.4vw;
}

/* Description immediately follows link */
.link-list p {
  font-weight: 400;
  font-size: 1.05vw;
  color: #333;
  opacity: 0.85;
}

/* dash separator */
.link-list p::before {
  content: " — ";
  color: rgba(0, 0, 0, 0.5);
}

.corner-button {
  position: fixed;       
  left: 1rem;
  top: 1rem;
  z-index: 1000;

  display: inline-flex;
  align-items: center;
  padding: 0.6rem 1rem;
  border-radius: 999px;

  background: rgba(255,255,255,.92);
  border: 1px solid #222;
  color: #111;
  text-decoration: none;
  font: inherit;
  box-shadow: 0 4px 10px rgba(0,0,0,.15);
  transition: background .15s ease, transform .3s ease;
}

.corner-button:hover {
 transform: scale(1.09);
}

/* ---------------- CODING TAB ---------------- */
#tab2 {
  font-size: 1.05vw;
  line-height: 1.8;
  color: #222;
  font-family: "Courier New", monospace;
  padding-right: 2vw;
}

/* Main title underline */
#tab2 h2 {
  font-size: 1.8vw;
  font-weight: 700;
  text-align: left;
  margin-bottom: 2vw;
  padding-bottom: 0.6vw;
  border-bottom: 0.15vw solid rgba(0, 0, 0, 0.6);
}

/* Step headers */
#tab2 h3 {
  font-size: 1.35vw;
  font-weight: bold;
  margin-top: 1.8vw;
  margin-bottom: 0.8vw;
  padding-bottom: 0.4vw;
  border-bottom: 0.1vw solid rgba(0, 0, 0, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Code blocks */
#tab2 pre {
  background: rgba(0, 0, 0, 0.05);
  border-radius: 0.6vw;
  padding: 1vw 1.5vw;
  overflow-x: auto;
  font-size: 0.9vw;
  color: #111;
  box-shadow: inset 0 0 0.3vw rgba(0, 0, 0, 0.1);
  margin: 1vw 0;
}

/* Inline code */
#tab2 code {
  background: rgba(0, 0, 0, 0.08);
  border-radius: 0.3vw;
  padding: 0.1vw 0.4vw;
  font-size: 0.9vw;
}

/* Step spacing and divider */
.coding-step {
  margin-bottom: 2vw;
  padding-bottom: 1.2vw;
  border-bottom: 0.08vw dashed rgba(0, 0, 0, 0.15);
}

.coding-intro p {
  font-size: 1.1vw;
  margin-bottom: 1.8vw;
}


#tab3 {
  font-size: 1.05vw;
  line-height: 1.8;
  color: #222;
  font-family: "Courier New", monospace;
  padding-right: 2vw;
}

#tab3 h2 {
  font-size: 1.8vw;
  font-weight: 700;
  text-align: left;
  margin-bottom: 2vw;
  padding-bottom: 0.6vw;
  border-bottom: 0.15vw solid rgba(0, 0, 0, 0.6);
}

#tab3 h3 {
  font-size: 1.35vw;
  font-weight: bold;
  margin-top: 1.5vw;
  margin-bottom: 0.8vw;
  padding-bottom: 0.4vw;
  border-bottom: 0.1vw solid rgba(0, 0, 0, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.setup-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.setup-list li {
  margin-bottom: 0.6vw;
  font-size: 1.05vw;
  color: #222;
}

/* Make key terms stand out */
.setup-list strong {
  color: #000;
  font-weight: 600;
}

/* Soft notebook-like divider between sections */
.setup-section {
  margin-bottom: 1.5vw;
  padding-bottom: 1vw;
  border-bottom: 0.08vw dashed rgba(0, 0, 0, 0.2);
}