:root {
  --midnight: #080b12;
  --abyss: #0f1420;
  --steel: #1d2434;
  --mist: #d2d8e8;
  --ember: #e19733;
  --tide: #3fc7ad;
  --warning: #e75744;
  --wood: #8a5c35;
  --wood-dark: #5b3d21;
  --card: rgba(18, 24, 36, 0.82);
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.35);
  --radius: 18px;
  --font-body: "Futura", "Avenir Next", "Trebuchet MS", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  background: radial-gradient(circle at 20% 20%, rgba(63, 199, 173, 0.08), transparent 35%),
              radial-gradient(circle at 80% 0%, rgba(225, 151, 51, 0.14), transparent 32%),
              linear-gradient(135deg, #0d0f18 0%, #0b0e16 45%, #0d1221 100%);
  color: var(--mist);
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 22px 60px;
  position: relative;
}

.app-shell::before {
  content: "";
  position: fixed;
  inset: 0;
  background: url("./assets/Main.png") center/cover no-repeat;
  opacity: 0.16;
  pointer-events: none;
  filter: saturate(0.9) blur(1px);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  margin-bottom: 18px;
  background: linear-gradient(90deg, rgba(17, 23, 36, 0.92), rgba(17, 23, 36, 0.72));
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  background: linear-gradient(145deg, var(--ember), var(--tide));
  color: var(--midnight);
  padding: 10px 12px;
  border-radius: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  box-shadow: 0 10px 30px rgba(63, 199, 173, 0.35);
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-sub {
  font-size: 12px;
  color: rgba(210, 216, 232, 0.72);
}

.nav-actions {
  display: flex;
  gap: 10px;
}

.nav-btn {
  background: rgba(31, 40, 61, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--mist);
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  transition: transform 150ms ease, opacity 150ms ease, border-color 150ms ease;
}

.nav-btn:hover { border-color: var(--ember); transform: translateY(-1px); }
.nav-btn:active { transform: translateY(0); opacity: 0.85; }

#view-root { position: relative; z-index: 1; }

.hero {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  align-items: stretch;
  margin-bottom: 18px;
}

.hero-card {
  padding: 20px;
  background: linear-gradient(135deg, rgba(33, 44, 64, 0.9), rgba(16, 19, 29, 0.92));
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(63, 199, 173, 0.16), transparent 35%);
  pointer-events: none;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: 30px;
  letter-spacing: 0.01em;
}

.hero p { margin: 0; color: rgba(210, 216, 232, 0.8); }

.hero .cta-row { margin-top: 18px; display: flex; gap: 10px; flex-wrap: wrap; }

.btn {
  border: none;
  cursor: pointer;
  padding: 12px 16px;
  font-weight: 700;
  border-radius: 12px;
  color: var(--midnight);
  background: linear-gradient(120deg, var(--ember), var(--tide));
  box-shadow: 0 14px 40px rgba(63, 199, 173, 0.35);
  transition: transform 140ms ease, box-shadow 140ms ease, opacity 140ms ease;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(1px); opacity: 0.85; }

.btn.secondary {
  background: transparent;
  color: var(--mist);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: none;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.stat-card {
  padding: 14px 16px;
  background: var(--card);
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow);
}

.stat-label { font-size: 12px; color: rgba(210, 216, 232, 0.7); }
.stat-value { font-size: 20px; font-weight: 800; letter-spacing: 0.04em; }

.section-title {
  margin: 18px 0 10px;
  font-size: 20px;
  letter-spacing: 0.02em;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 12px;
  background: rgba(63, 199, 173, 0.16);
  color: var(--tide);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.progress {
  width: 100%;
  height: 8px;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
  margin: 6px 0 10px;
}

.progress > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--tide), var(--ember));
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}

.module-card h3 { margin: 0 0 6px; }
.module-card p { margin: 0; color: rgba(210, 216, 232, 0.8); }

.action-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(31, 40, 61, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-weight: 600;
  color: var(--mist);
}

.node-list { display: grid; gap: 10px; }

.node {
  padding: 14px;
  border-radius: 14px;
  background: linear-gradient(110deg, rgba(90, 61, 33, 0.45), rgba(44, 31, 20, 0.8));
  border: 1px solid rgba(255, 255, 255, 0.07);
  position: relative;
  overflow: hidden;
}

.node::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(225, 151, 51, 0.08), transparent 55%);
  pointer-events: none;
}

.node h4 { margin: 0 0 6px; font-size: 16px; }
.node .meta { margin: 0; color: rgba(210, 216, 232, 0.72); font-size: 12px; }

.node .status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--mist);
  padding: 6px 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
}

.node.locked { opacity: 0.65; }
.node.complete { border-color: rgba(63, 199, 173, 0.5); }

.question-box {
  padding: 16px;
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(45, 60, 88, 0.9), rgba(21, 26, 38, 0.95));
  border: 1px solid rgba(255, 255, 255, 0.07);
  box-shadow: var(--shadow);
}

.question-box h3 { margin: 0 0 8px; }
.question-box p { margin: 0 0 10px; color: rgba(210, 216, 232, 0.8); }

.answers { display: grid; gap: 10px; margin: 12px 0; }

.answer {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(31, 40, 61, 0.6);
  color: var(--mist);
  text-align: left;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease, transform 120ms ease;
}

.answer:hover { border-color: var(--tide); transform: translateY(-1px); }
.answer.selected { border-color: var(--tide); background: rgba(63, 199, 173, 0.14); }
.answer.revealed.correct { border-color: var(--tide); background: rgba(63, 199, 173, 0.18); }
.answer.revealed.wrong { border-color: var(--warning); background: rgba(231, 87, 68, 0.18); }
.answer.disabled { opacity: 0.65; cursor: not-allowed; transform: none; }

.answer input { margin-right: 8px; accent-color: var(--ember); }

.short-answer {
  width: 100%;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(31, 40, 61, 0.6);
  color: var(--mist);
  font-size: 16px;
}

.question-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 8px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--mist);
  font-size: 12px;
}

.block-list { padding-left: 18px; margin: 8px 0; color: rgba(210, 216, 232, 0.82); }

.callout {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px dashed rgba(255, 255, 255, 0.16);
  background: rgba(63, 199, 173, 0.08);
  color: var(--tide);
  font-weight: 700;
}

.callout.success {
  border-color: rgba(63, 199, 173, 0.4);
  background: rgba(63, 199, 173, 0.12);
  color: var(--tide);
}

.callout.warn {
  border-color: rgba(231, 87, 68, 0.4);
  background: rgba(231, 87, 68, 0.1);
  color: var(--warning);
}

.toast {
  position: fixed;
  bottom: 18px;
  right: 18px;
  padding: 12px 14px;
  background: rgba(10, 14, 22, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: var(--mist);
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: transform 150ms ease, opacity 150ms ease;
  z-index: 20;
}

.toast.hidden { opacity: 0; transform: translateY(8px); pointer-events: none; }

.terminal-box {
  background: rgba(9, 12, 18, 0.9);
  border: 1px solid rgba(225, 151, 51, 0.18);
  border-radius: 12px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.03), var(--shadow);
  padding: 10px;
  font-family: "SFMono-Regular", "Menlo", "Consolas", monospace;
  color: var(--mist);
}

.terminal-bar {
  font-size: 12px;
  color: rgba(210, 216, 232, 0.7);
  margin-bottom: 6px;
  letter-spacing: 0.04em;
}

.terminal-line {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 8px;
}

.terminal-line .prompt {
  color: var(--tide);
  font-weight: 700;
  padding-top: 6px;
}

.terminal-input {
  width: 100%;
  min-height: 72px;
  background: rgba(18, 24, 36, 0.92);
  color: var(--mist);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 10px 12px;
  font-family: "SFMono-Regular", "Menlo", "Consolas", monospace;
  resize: vertical;
}

.terminal-input:disabled {
  opacity: 0.65;
}

@media (max-width: 640px) {
  .topbar { flex-direction: column; align-items: flex-start; gap: 10px; }
  .nav-actions { width: 100%; }
  .nav-btn { flex: 1; text-align: center; }
}