:root
{
  --bg: #0d1117;
  --card-bg: #161b22;
  --accent-blue: #019cdf;
  --accent-green: #45b87b;
  --text: #f0f6fc;
  --text-dim: #8b949e;
  --border: #30363d;
  --radius: 12px;
}

body
{
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  display: flex;
  justify-content: center;
  padding: 40px 20px;
  line-height: 1.6;
}

#main-content
{
  max-width: 540px;
  width: 100%;
}

h1
{
  text-align: left;
  font-size: 2rem;
  margin-bottom: 8px;
}

h1 .blue
{
  color: var(--accent-blue);
}

h1 .green
{
  color: var(--accent-green);
}

h2
{
  margin: 0 0 15px 0;
  font-size: 1.2rem;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 1px;
}

h2 .blue
{
  color: var(--accent-blue);
}

h2 .green
{
  color: var(--accent-green);
}

a
{
    text-decoration: none;
}

button:hover
{
  cursor: pointer;
}

.btn
{
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.2s ease;
    text-decoration: none !important;
    display: inline-block;
    text-align: center;
    cursor: pointer;

    background: transparent;
    border: 1px solid #30363d;
}

.btn:hover
{
    transform: translateY(-2px);
    border-color: #8b949e;
}

.input-group
{
  display: flex;
  gap: 10px;
  margin-top: 20px;
  width: 100%;
}

input, select
{
  background: #0d1117;
  border: 1px solid var(--border);
  color: white;
  padding: 10px 14px;
  border-radius: 8px;
  outline: none;
  box-sizing: border-box;
}

input:focus
{
  border-color: var(--accent-blue);
}

.card
{
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  animation: fade_in_up 0.6s ease-out forwards;
}

.card.highlight
{
  border: 1px solid var(--accent-green);
  background: linear-gradient(145deg, #161b22 0%, #0d2117 100%);
}

.card.highlight h2
{
  color: var(--accent-green);
}

.divider
{
  height: 1px;
  background: var(--border);
  margin: 20px 0;
}

.logo
{
  height: 50px;
  width: auto;
  margin-bottom: 10px;
  display: block;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

/* Animations - based on keyframes */
.fade-in
{
  animation: fade_in_up 0.5s ease-out forwards;
}

.fade-out
{
  animation: fade_out_down 0.4s ease-in forwards;
}

.slide-in
{
  animation: slide_down 0.4s ease-out forwards;
  transform-origin: top center;
}

.loading-spinner
{
  animation: spin 1s linear infinite;
}


.error-msg
{
  color: #ff6b6b;
  font-size: 0.85rem;
  margin: 10px 0;
}

.accent-link
{
  color: var(--accent-blue);
  text-decoration: none;
  font-weight: bold;
}

.accent-link:hover
{
  text-decoration: underline;
}

.topic-grid
{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 10px;
  align-items: start;
}

.topic-category
{
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid #30363d;
  border-radius: 10px;
  padding: 20px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.topic-category:hover
{
  border-color: var(--accent-blue);
  transform: translateY(-2px);
}

.topic-category h4
{
  margin-top: 0;
  display: flex;
  align-items: center;
}

.topic-category ul
{
  list-style: none;
  padding: 0;
  margin: 10px 0 20px 0;
}

.topic-category li
{
  font-size: 0.9rem;
  padding: 4px 0;
  position: relative;
  padding-left: 15px;
}


.badge
{
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 20px;
}

.badge.blue
{
    background-color: rgba(56, 139, 253, 0.15);
    color: var(--accent-blue);
    border: 1px solid rgba(56, 139, 253, 0.4);
}

.badge.green
{
    background-color: rgba(43, 183, 120, 0.15);
    color: var(--accent-green);
    border: 1px solid rgba(43, 183, 120, 0.4);
}

.badge + span
{
    font-size: 0.85rem;
    color: var(--text-dim);
    font-weight: 500;
    margin-left: 5px;
}

@media (max-width: 600px)
{
    .topic-grid
    {
      grid-template-columns: 1fr;
    }
}