@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

:root {
  --bg-dark: #0b1620;
  --card-dark: #101e2b;
  --text: #cfd8e3;
  --highlight: #00ffff;
  --accent: #f6c90e;
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  width: 90%;
  max-width: 900px;
}

.header {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #0d1428;
  border: 1px solid #1a233a;
  box-shadow: 0 0 20px #00ffff20;
  padding: 15px 20px;
  border-radius: 12px;
  margin-bottom: 25px;
}

.header-container {
  display: flex;
  width: 100%;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

.hContainer {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo {
  background: #ffce00;
  color: #001020;
  padding: 5px 10px;
  border-radius: 6px;
  font-weight: 700;
}

.header h1 {
  font-size: 1.3rem;
}

.header span {
  color: var(--highlight);
}

.lightbulb {
  font-size: 1.5rem;
}

.main-content {
  display: flex;
  gap: 25px;
}

.challenge-box {
  flex: 2;
  background: #0d1428;
  border: 1px solid #1a233a;
  box-shadow: 0 0 20px #00ffff20;
  padding: 30px;
  border-radius: 16px;
}

.challenge-header {
  background: #111b33;
  border-radius: 15px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.category-tag {
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 8px;
}

.challenge-box h2 {
  color: #f8fafc;
  font-size: 1.3rem;
  margin-bottom: 10px;
}

.challenge-box .description {
  color: #94a3b8;
  margin-bottom: 20px;
}

/* Example + Starter Section */
.example, .starter {
  background: #111b33;
  border-radius: 10px;
  padding: 15px;
  margin-bottom: 25px;
  font-family: 'Fira Code', monospace;
  max-width: 100%;
  overflow: auto;
  box-sizing: border-box;
}


.comment {
  color: #64748b;
}

/* Hint Section */
.hint-section {
  margin-bottom: 20px;
}

.hint-btn {
  background-color: var(--highlight);
  color: #0a0f1e;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  padding: 10px 15px;
  cursor: pointer;
  transition: 0.3s;
}

.hint-btn:hover {
  background-color: #00e6e6;
}

.hint-text {
  background: #101a32;
  border-left: 3px solid var(--accent);
  margin-top: 10px;
  padding: 10px;
  border-radius: 8px;
  color: #f6f6f6;
  font-size: 0.9rem;
}

/* Code Editor */
.editor {
  background: #0b1224;
  border-radius: 12px;
  margin-bottom: 20px;
  border: 1px solid #1f2a44;
  overflow: hidden;
}

.editor-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: #101a32;
}

.circle {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.red { background: #ff5f56; }
.yellow { background: #ffbd2e; }
.green { background: #27c93f; }

textarea {
  width: 100%;
  height: 160px;
  background: transparent;
  border: none;
  outline: none;
  color: #f8fafc;
  font-family: 'Fira Code', monospace;
  font-size: 0.95rem;
  padding: 15px;
  resize: none;
}

/* Buttons */
.btns {
  display: flex;
  gap: 12px;
  justify-content: flex-start;
}

button {
  border: none;
  cursor: pointer;
  font-weight: 600;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 0.95rem;
  transition: 0.3s;
}

.run {
  background-color: #00ffff;
  color: #0a0f1e;
}

.next {
  background-color: #ffce00;
  color: #0a0f1e;
}

.run:hover {
  background-color: #00e6e6;
}

.next:hover {
  background-color: #ffdb4d;
}

/* Episodes */
.episodes {
  flex: 1;
  background: #0d1428;
  border: 1px solid #1a233a;
  box-shadow: 0 0 20px #00ffff20;
  border-radius: 16px;
  padding: 25px;
  text-align: center;
}

.episodes h3 {
  color: var(--highlight);
  margin-bottom: 15px;
}

.episodes ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.episodes li {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  width: 35px;
  height: 35px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--highlight);
  font-weight: bold;
  margin: 0 auto;
  cursor: pointer;
  transition: 0.3s;
}

.episodes li.active {
  background: var(--highlight);
  color: #001020;
}

.episodes li:hover {
  background-color: #ffce00;
  color: #0a0f1e;
}


pre[class*="language-"],
code[class*="language-"] {
  background: none !important;
  color: inherit !important;
}


/* Responsive layout */
@media (max-width: 768px) {
  body {
    padding: 10px;
    overflow-y: auto;
  }

  .main-content {
    flex-direction: column;
    gap: 15px;
  }

  .episodes {
    order: -1;
    width: 100%;
    margin-bottom: 10px;
    padding: 15px;
  }

  .episodes ul {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2px;
  }

  .episodes li {
    width: 40px;
    height: 40px;
    font-size: 0.9rem;
  }

  .challenge-box {
    width: 100%;
    padding: 20px;
  }

  .header h1 {
    font-size: 1rem;
  }

  .CodeMirror {
    height: 140px;
  }
}

@media (max-width: 480px) {
  .header h1 {
    font-size: 0.9rem;
  }

  .episodes li {
    width: 35px;
    height: 35px;
    font-size: 0.8rem;
  }

  .challenge-box {
    padding: 15px;
  }

  .CodeMirror {
    height: 130px;
  }
}