/* =========================
   GLOBAL RESET
========================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  color: #00ff41;
  font-family: "Courier New", monospace;
}

a {
  color: #00ff41;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* =========================
   MATRIX BACKGROUND
========================= */
#matrix-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  background: #000;
}

/* =========================
   LOADING SCREEN
========================= */
#loading-screen {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at center, #001a00 0%, #000 60%, #000 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.loading-title {
  font-size: 64px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: #00ff41;
  text-shadow: 0 0 12px #00ff41, 0 0 24px #00ff41;
  margin-bottom: 20px;
}

.loading-sub {
  font-size: 16px;
  color: #00ff41cc;
  margin-bottom: 30px;
}

.loading-bar {
  width: 60%;
  max-width: 500px;
  height: 10px;
  border: 1px solid #00ff41;
  border-radius: 999px;
  overflow: hidden;
  box-shadow: 0 0 12px #00ff41;
}

.loading-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, #00ff41, #00ffaa);
  box-shadow: 0 0 12px #00ff41;
  transition: width 0.2s linear;
}

.loading-text {
  margin-top: 10px;
  font-size: 14px;
  color: #00ff41aa;
}

/* =========================
   MAIN LAYOUT
========================= */
#app {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 260px 1fr;
  height: 100vh;
  overflow: hidden;
}

/* =========================
   SIDEBAR
========================= */
#sidebar {
  background: rgba(0, 0, 0, 0.9);
  border-right: 1px solid #00ff41;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  overflow-y: auto;
}

.sidebar-title {
  font-size: 26px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 5px;
  text-shadow: 0 0 10px #00ff41;
}

.sidebar-sub {
  font-size: 12px;
  color: #00ff41aa;
  margin-bottom: 10px;
}

.sidebar-section-label {
  font-size: 12px;
  color: #00ff41aa;
  margin-top: 10px;
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.sidebar-menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sidebar-link {
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid #00ff41;
  background: rgba(0, 0, 0, 0.8);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s, box-shadow 0.15s;
}

.sidebar-link:hover {
  background: rgba(0, 255, 65, 0.1);
  box-shadow: 0 0 12px #00ff41;
  transform: translateX(2px);
}

.sidebar-dropdown {
  list-style: none;
  margin-left: 10px;
  margin-top: 5px;
  display: none;
  flex-direction: column;
  gap: 4px;
}

.sidebar-dropdown.open {
  display: flex;
}

.sidebar-dropdown li a {
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: rgba(0, 0, 0, 0.7);
}

.sidebar-dropdown li a:hover {
  border-color: #00ff41;
  background: rgba(0, 255, 65, 0.1);
}

/* =========================
   MAIN CONTENT
========================= */
#main {
  position: relative;
  padding: 20px 30px;
  overflow-y: auto;
}

.page-title {
  font-size: 40px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: 10px;
  text-shadow: 0 0 12px #00ff41;
}

.page-subtitle {
  font-size: 14px;
  color: #00ff41aa;
  margin-bottom: 30px;
}

.bubble-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.bubble-button {
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid #00ff41;
  background: rgba(0, 0, 0, 0.85);
  font-size: 13px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.bubble-button:hover {
  background: rgba(0, 255, 65, 0.1);
  box-shadow: 0 0 12px #00ff41;
  transform: translateY(-1px);
}

/* =========================
   SECTION BLOCKS
========================= */
.section-block {
  margin-bottom: 40px;
  padding: 18px 20px;
  border-radius: 12px;
  border: 1px solid #00ff41;
  background: rgba(0, 0, 0, 0.85);
  box-shadow: 0 0 18px rgba(0, 255, 65, 0.25);
}

.section-title {
  font-size: 20px;
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.section-subtitle {
  font-size: 13px;
  color: #00ff41aa;
  margin-bottom: 15px;
}

.section-text {
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: 10px;
}

.section-list {
  list-style: none;
  margin-left: 10px;
  margin-top: 8px;
  margin-bottom: 10px;
}

.section-list li {
  font-size: 13px;
  margin-bottom: 4px;
  position: relative;
  padding-left: 14px;
}

.section-list li::before {
  content: ">";
  position: absolute;
  left: 0;
  color: #00ff41;
}

/* =========================
   TAGS
========================= */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.tag {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid #00ff41;
  background: rgba(0, 0, 0, 0.9);
}

/* =========================
   INLINE CODE
========================= */
.code-inline {
  font-family: "Courier New", monospace;
  background: rgba(0, 0, 0, 0.9);
  padding: 2px 4px;
  border-radius: 4px;
  border: 1px solid #00ff41;
  font-size: 12px;
}

/* =========================
   LESSON CARDS
========================= */
.lesson-grid,
.sim-grid,
.micro-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 10px;
}

.lesson-card,
.sim-card,
.micro-card {
  border-radius: 10px;
  border: 1px solid #00ff41;
  background: rgba(0, 0, 0, 0.9);
  padding: 14px 16px;
  box-shadow: 0 0 14px rgba(0, 255, 65, 0.2);
}

.lesson-title,
.sim-title,
.micro-title {
  font-size: 15px;
  margin-bottom: 6px;
}

.lesson-meta,
.sim-meta {
  font-size: 11px;
  color: #00ff41aa;
  margin-bottom: 8px;
}

.lesson-desc,
.sim-desc,
.micro-desc {
  font-size: 12px;
  line-height: 1.5;
  margin-bottom: 8px;
}

.lesson-outcomes,
.sim-outcomes,
.micro-list {
  list-style: none;
  margin-left: 10px;
  margin-top: 4px;
}

.lesson-outcomes li,
.sim-outcomes li,
.micro-list li {
  font-size: 12px;
  margin-bottom: 3px;
  position: relative;
  padding-left: 12px;
}

.lesson-outcomes li::before,
.sim-outcomes li::before,
.micro-list li::before {
  content: "-";
  position: absolute;
  left: 0;
  color: #00ff41;
}

.lesson-button,
.sim-button {
  margin-top: 8px;
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid #00ff41;
  font-size: 12px;
  cursor: pointer;
  background: rgba(0, 0, 0, 0.9);
  transition: background 0.15s, box-shadow 0.15s, transform 0.15s;
}

.lesson-button:hover,
.sim-button:hover {
  background: rgba(0, 255, 65, 0.1);
  box-shadow: 0 0 10px #00ff41;
  transform: translateY(-1px);
}

/* =========================
   FOOTER
========================= */
.footer {
  margin-top: 30px;
  font-size: 11px;
  color: #00ff41aa;
  border-top: 1px solid #00ff41;
  padding-top: 10px;
}

.footer span {
  display: block;
  margin-bottom: 2px;
}

/* =========================
   SCROLLBARS
========================= */
#sidebar::-webkit-scrollbar,
#main::-webkit-scrollbar {
  width: 6px;
}

#sidebar::-webkit-scrollbar-thumb,
#main::-webkit-scrollbar-thumb {
  background: #00ff41;
}

#sidebar::-webkit-scrollbar-track,
#main::-webkit-scrollbar-track {
  background: #000;
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 800px) {
  #app {
    grid-template-columns: 1fr;
  }
  #sidebar {
    height: 220px;
    border-right: none;
    border-bottom: 1px solid #00ff41;
  }
  #main {
    height: calc(100vh - 220px);
  }
}