/* style.css - Roadmap Builder Pro v5.1 Frontend */

:root {
  --rb-line-color: #cdd3d8;
  --rb-card-bg: #ffffff;
  --rb-text-main: #2c3e50;
  --rb-text-light: #555;
  --rb-shadow-light: rgba(0,0,0,0.05);
  --rb-shadow-hover: rgba(0,0,0,0.08);

  /* Type Colors */
  --type-article-bg: #e5f1f7;
  --type-article-text: #005a87;
  --type-article-border: #0073aa;

  --type-ebook-bg: #fceded;
  --type-ebook-text: #a52a18;
  --type-ebook-border: #d54e21;

  --type-resources-bg: #f0f0f1;
  --type-resources-text: #50575e;
  --type-resources-border: #7e8993;

  --type-pdf-bg: #fae9e9;
  --type-pdf-text: #962424;
  --type-pdf-border: #b92626;

  --type-video-bg: #f5eef9;
  --type-video-text: #702f97;
  --type-video-border: #a04cd0;

  --type-quiz-bg: #e7f7e9;
  --type-quiz-text: #1d6e2d;
  --type-quiz-border: #4ab866;

  --type-challenge-bg: #fff8e6;
  --type-challenge-text: #996e0b;
  --type-challenge-border: #e6a303;
}

.rb-roadmap-wrapper {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding: 1rem;
  box-sizing: border-box;
  max-width: 900px;
  margin: 0 auto;
}

.rb-tree {
  list-style: none;
  margin: 0;
  padding-left: 30px;
  position: relative;
}

/* --- Connecting Lines --- */
.rb-tree::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  background: var(--rb-line-color);
}
.rb-tree > .rb-node:first-child::before { top: 30px; }
.rb-tree > .rb-node:last-child::before { height: 30px; }

.rb-node {
  margin: 0;
  padding: 20px 0;
  position: relative;
}
.rb-node::before {
  content: '';
  position: absolute;
  top: 30px;
  left: -30px;
  width: 30px;
  height: 2px;
  background: var(--rb-line-color);
}

.rb-card {
  background: var(--rb-card-bg);
  border: 1px solid #e5e5e5;
  border-left-width: 5px;
  border-radius: 8px;
  padding: 16px 20px;
  box-shadow: 0 4px 12px var(--rb-shadow-light);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: inline-block;
  min-width: 280px;
  max-width: 100%;
}
.rb-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px var(--rb-shadow-hover);
}

/* --- Card Coloring by Type --- */
.rb-node[data-format-type="article"] .rb-card { border-left-color: var(--type-article-border); }
.rb-node[data-format-type="article"] .rb-badge-type { background-color: var(--type-article-bg); color: var(--type-article-text); }
.rb-node[data-format-type="ebook"] .rb-card { border-left-color: var(--type-ebook-border); }
.rb-node[data-format-type="ebook"] .rb-badge-type { background-color: var(--type-ebook-bg); color: var(--type-ebook-text); }
.rb-node[data-format-type="resources"] .rb-card { border-left-color: var(--type-resources-border); }
.rb-node[data-format-type="resources"] .rb-badge-type { background-color: var(--type-resources-bg); color: var(--type-resources-text); }
.rb-node[data-format-type="pdf"] .rb-card { border-left-color: var(--type-pdf-border); }
.rb-node[data-format-type="pdf"] .rb-badge-type { background-color: var(--type-pdf-bg); color: var(--type-pdf-text); }
.rb-node[data-format-type="video"] .rb-card { border-left-color: var(--type-video-border); }
.rb-node[data-format-type="video"] .rb-badge-type { background-color: var(--type-video-bg); color: var(--type-video-text); }
.rb-node[data-format-type="quiz"] .rb-card { border-left-color: var(--type-quiz-border); }
.rb-node[data-format-type="quiz"] .rb-badge-type { background-color: var(--type-quiz-bg); color: var(--type-quiz-text); }
.rb-node[data-format-type="challenge"] .rb-card { border-left-color: var(--type-challenge-border); }
.rb-node[data-format-type="challenge"] .rb-badge-type { background-color: var(--type-challenge-bg); color: var(--type-challenge-text); }

.rb-card-title {
  font-weight: 600;
  color: var(--rb-text-main);
  font-size: 1.1rem;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.rb-card-title a { color: inherit; text-decoration: none; transition: color 0.2s; }
.rb-card-title a:hover { color: var(--type-article-border); }
.rb-icon { width: 20px; height: 20px; opacity: 0.7; }

.rb-badges { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.rb-badge { font-size: 11px; font-weight: 700; padding: 4px 10px; border-radius: 15px; text-transform: uppercase; letter-spacing: 0.5px; }
.rb-badge-difficulty { background-color: #fff5e6; color: #996213; }

/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
  .rb-roadmap-wrapper { padding: 0.5rem; }
  .rb-card { width: 100%; min-width: unset; box-sizing: border-box; }
  .rb-tree { padding-left: 20px; }
  .rb-node::before { left: -20px; width: 20px; }
  .rb-card-title { font-size: 1rem; }
}