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

body {
  background: #f4f6f8;
  color: #222;
  padding: 40px;
}

.container {
  max-width: 1000px;
  margin: auto;
}

h1 {
  text-align: center;
  margin-bottom: 30px;
  font-size: 38px;
  color: #1e293b;
}

.tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 25px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 12px 24px;
  border: none;
  background: #dbe2ea;
  cursor: pointer;
  border-radius: 10px;
  transition: 0.3s;
  font-size: 16px;
}

.tab-btn:hover {
  background: #c8d2dc;
}

.tab-btn.active {
  background: #1e293b;
  color: white;
}

.tab-content {
  display: none;
  background: white;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.tab-content.active {
  display: block;
}

h2 {
  margin-bottom: 15px;
  color: #1e293b;
}

p {
  margin-bottom: 15px;
  line-height: 1.6;
}

.code {
  background: #0f172a;
  color: #e2e8f0;
  padding: 18px;
  border-radius: 12px;
  overflow: auto;
  margin-top: 15px;
}

pre {
  white-space: pre-wrap;
}

.note {
  background: #eef2f7;
  padding: 12px;
  border-left: 4px solid #1e293b;
  border-radius: 8px;
  margin-bottom: 20px;
}

.theory-block {
  margin-bottom: 40px;
  padding-bottom: 25px;
  border-bottom: 1px solid #dbe2ea;
}

.theory-block h3 {
  font-size: 28px;
  margin-bottom: 18px;
  color: #1e293b;
}

.theory-block p {
  margin-bottom: 14px;
  line-height: 1.7;
  font-size: 16px;
}

.code {
  background: #eef2f7;
  color: #1e293b;
  padding: 18px;
  border-radius: 12px;
  overflow: auto;
  margin: 18px 0;
  border: 1px solid #d8dee7;
}

.code pre {
  white-space: pre-wrap;
  font-size: 15px;
  line-height: 1.6;
}

.pygame-quick-nav {
  display: flex;
  gap: 12px;
  margin: 20px 0 30px 0;
  flex-wrap: wrap;
}

.quick-btn {
  padding: 10px 18px;
  background: #eef2f7;
  border: 1px solid #dbe2ea;
  border-radius: 999px;
  text-decoration: none;
  color: #1e293b;
  font-weight: 500;
  font-size: 15px;
  transition: 0.25s;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.quick-btn:hover {
  background: #d9dadf;
  color: white;
  transform: translateY(-1px);
}

.scroll-top {
  position: fixed;
  right: 20px;
  bottom: 20px;

  width: 45px;
  height: 45px;

  border-radius: 50%;
  border: none;

  background: #1e293b;
  color: white;

  font-size: 20px;
  cursor: pointer;

  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
  transition: 0.3s;

  display: none; /* спочатку прихована */
}

.scroll-top:hover {
  transform: translateY(-3px);
  background: #0f172a;
}

#theory .code {
  background: hsl(198, 93%, 90%);
  color: #0f172a;
  padding: 18px;
  border-radius: 14px;
  overflow: auto;
  margin: 18px 0;
  border: 1px solid #e2e8f0;
  border-left: 4px solid #38bdf8; /* акцент як у сучасних туторіалах */
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.04);
}

/* теорія */
#theory .theory-block {
  margin: 30px 0;
  padding: 20px;
  border-radius: 16px;
  background: hsl(145, 25%, 94%); /* дуже м’який зелено-сірий */
  color: #1f2a24;
  border: 1px solid hsl(145, 20%, 85%);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.05);
}

#theory .theory-block h3 {
  margin-bottom: 15px;
  font-size: 22px;
  color: hsl(145, 35%, 28%); /* приглушений зелений */
}

/* кнопки навігації */
#theory .quick-btn {
  background: hsl(145, 20%, 88%);
  color: hsl(145, 35%, 25%);
  border-radius: 10px;
  transition: 0.2s ease;
}

#theory .quick-btn:hover {
  background: hsl(145, 35%, 45%);
  color: #fff;
  transform: translateY(-2px);
}

#theory .theory-block img {
  display: block;
  border-radius: 12px;
  margin-top: 10px;
  transition: transform 0.2s ease;
}

#theory .pygame-quick-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

/* =========================
   FLASK TAB — BLUEBERRY STYLE
   світлий + ягідно-синій
========================= */

#flask .theory-block-flask {
  margin: 30px 0;
  padding: 22px;
  border-radius: 16px;

  background: #f7f9ff; /* дуже світлий синій */
  border: 1px solid #dbeafe;

  box-shadow: 0 6px 16px rgba(30, 64, 175, 0.06);
  color: #1f2937;
}

#flask .theory-block-flask h3 {
  margin-bottom: 15px;
  font-size: 22px;
  color: #294684; /* синій акцент */
}

/* =========================
   CODE (СВІТЛИЙ БЛОК)
========================= */

#flask .code-flask {
  background: #eef2ff; /* світлий індиго */
  color: #1e293b;

  padding: 18px;
  border-radius: 14px;
  margin: 15px 0;

  border-left: 4px solid #3b82f6; /* синій акцент */
  border: 1px solid #dbeafe;

  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.04);
}

#flask .code-flask pre {
  white-space: pre-wrap;
  font-size: 15px;
  line-height: 1.6;
}

/* =========================
   NAVIGATION BUTTONS
========================= */

.flask-quick-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 30px 0;
}

.quick-btn-flask {
  padding: 10px 16px;
  border-radius: 999px;

  background: #eef2ff;
  color: #1d4ed8;

  border: 1px solid #dbeafe;

  text-decoration: none;
  font-weight: 500;
  transition: 0.2s ease;
}

.quick-btn-flask:hover {
  background: #607fc2;
  color: white;
  transform: translateY(-2px);
}

/* =========================
   LISTS (ХІМІЯ)
========================= */

#flask ul {
  padding-left: 20px;
  margin-top: 10px;
}

#flask li {
  margin-bottom: 6px;
}


.board {
	float: right;
	max-width: 100%;
	width: 400px;
}