/* Shared styles for landing / academy / marketplace / teacher */

.m-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--m-sp-8) var(--m-sp-6);
}
.m-page-narrow { max-width: 880px; }

.m-hero {
  padding: 56px var(--m-sp-6) 40px;
  text-align: center;
  background: linear-gradient(180deg, var(--m-brand-light), var(--m-bg) 80%);
  border-bottom: 1px solid var(--m-border);
}
.m-hero .m-h1 { font-size: 38px; max-width: 740px; margin: 0 auto var(--m-sp-3); }
.m-hero .m-subtitle {
  font-size: 17px; color: var(--m-text-secondary); margin: 0 auto var(--m-sp-6);
  max-width: 620px;
}
.m-hero-cta { display: flex; gap: var(--m-sp-3); justify-content: center; }

.m-grid {
  display: grid;
  gap: var(--m-sp-4);
}
.m-grid-2 { grid-template-columns: repeat(2, 1fr); }
.m-grid-3 { grid-template-columns: repeat(3, 1fr); }
.m-grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 800px) {
  .m-grid-2, .m-grid-3, .m-grid-4 { grid-template-columns: 1fr; }
}

.m-pillar-card {
  background: var(--m-bg-elevated);
  border: 1px solid var(--m-border);
  border-radius: var(--m-r-lg);
  padding: var(--m-sp-6);
  text-align: left;
}
.m-pillar-card .m-pillar-icon {
  width: 44px; height: 44px;
  background: var(--m-brand-light); color: var(--m-brand-dark);
  border-radius: var(--m-r-md);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--m-sp-3);
}
.m-pillar-card h3 { margin: 0 0 6px; font-size: 16px; }
.m-pillar-card p { margin: 0; color: var(--m-text-secondary); font-size: 13px; line-height: 1.55; }

/* Marketplace tile */
.m-tile {
  background: var(--m-bg-elevated);
  border: 1px solid var(--m-border);
  border-radius: var(--m-r-lg);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s;
}
.m-tile:hover { transform: translateY(-2px); border-color: var(--m-brand); }
.m-tile-cover {
  height: 110px;
  background: linear-gradient(135deg, var(--m-brand-light), var(--m-accent-light));
  display: flex; align-items: center; justify-content: center;
  font-size: 32px; color: var(--m-brand-dark);
}
.m-tile-body { padding: var(--m-sp-3) var(--m-sp-4) var(--m-sp-4); }
.m-tile-tag {
  display: inline-block; font-size: 10px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.05em;
  padding: 2px 8px; border-radius: 100px;
  margin-bottom: 6px;
}
.m-tile-tag.hw { background: var(--m-info-bg); color: var(--m-info); }
.m-tile-tag.ai { background: #FBEAF0; color: #72243E; }
.m-tile-tag.blocks { background: #FAECE7; color: #712B13; }
.m-tile-tag.curr { background: var(--m-success-bg); color: var(--m-success); }
.m-tile h4 { margin: 0 0 4px; font-size: 14px; font-weight: 600; }
.m-tile .m-tile-by { color: var(--m-text-tertiary); font-size: 12px; margin-bottom: var(--m-sp-2); }
.m-tile-stats { display: flex; gap: var(--m-sp-3); font-size: 11px; color: var(--m-text-secondary); }
.m-tile-stats span { display: flex; align-items: center; gap: 3px; }

/* Lesson player */
.m-lesson-layout {
  display: grid;
  grid-template-columns: 240px 1fr 280px;
  gap: var(--m-sp-4);
  margin-top: var(--m-sp-4);
}
@media (max-width: 1000px) {
  .m-lesson-layout { grid-template-columns: 1fr; }
}
.m-lesson-steps {
  background: var(--m-bg-elevated);
  border: 1px solid var(--m-border);
  border-radius: var(--m-r-lg);
  padding: var(--m-sp-4);
  height: fit-content;
  position: sticky;
  top: 80px;
}
.m-lesson-step {
  display: flex; align-items: center; gap: var(--m-sp-2);
  padding: 8px 10px;
  border-radius: var(--m-r-sm);
  font-size: 13px;
  color: var(--m-text-secondary);
  cursor: pointer;
}
.m-lesson-step:hover { background: var(--m-bg-subtle); }
.m-lesson-step.active { background: var(--m-brand-light); color: var(--m-brand-dark); font-weight: 500; }
.m-lesson-step .m-step-num {
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--m-bg-subtle); color: var(--m-text-secondary);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 600;
  flex-shrink: 0;
}
.m-lesson-step.done .m-step-num { background: var(--m-success-bg); color: var(--m-success); }
.m-lesson-step.active .m-step-num { background: var(--m-brand); color: white; }
.m-lesson-step .m-step-time { margin-left: auto; font-size: 11px; color: var(--m-text-tertiary); }

.m-lesson-content {
  background: var(--m-bg-elevated);
  border: 1px solid var(--m-border);
  border-radius: var(--m-r-lg);
  padding: var(--m-sp-8);
}
.m-lesson-content h2 { margin-top: 0; }
.m-lesson-prose { font-size: 15px; line-height: 1.7; color: var(--m-text); }

.m-callout {
  background: var(--m-accent-light);
  border-left: 4px solid var(--m-accent);
  padding: var(--m-sp-3) var(--m-sp-4);
  border-radius: 0 var(--m-r-md) var(--m-r-md) 0;
  margin: var(--m-sp-4) 0;
  font-size: 14px;
}

.m-mentor-panel {
  background: var(--m-bg-elevated);
  border: 1px solid var(--m-border);
  border-radius: var(--m-r-lg);
  height: fit-content;
  position: sticky;
  top: 80px;
  overflow: hidden;
}
.m-mentor-head {
  padding: var(--m-sp-3) var(--m-sp-4);
  background: #FBEAF0;
  display: flex; align-items: center; gap: var(--m-sp-2);
  border-bottom: 1px solid var(--m-border);
}
.m-mentor-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: #D4537E; color: white;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 600;
}
.m-mentor-msgs {
  padding: var(--m-sp-3);
  max-height: 320px;
  overflow-y: auto;
  display: flex; flex-direction: column; gap: var(--m-sp-2);
}
.m-mentor-msg {
  padding: 8px 12px;
  border-radius: var(--m-r-md);
  font-size: 13px;
  line-height: 1.5;
}
.m-mentor-msg.them { background: #FBEAF0; color: #72243E; align-self: flex-start; max-width: 90%; }
.m-mentor-msg.me { background: var(--m-brand-light); color: var(--m-brand-dark); align-self: flex-end; max-width: 90%; }
.m-mentor-foot {
  padding: var(--m-sp-2) var(--m-sp-3);
  border-top: 1px solid var(--m-border);
  display: flex; gap: var(--m-sp-2);
}
.m-mentor-foot input {
  flex: 1;
  border: 1px solid var(--m-border);
  border-radius: var(--m-r-md);
  padding: 8px 12px;
  font-family: inherit; font-size: 13px;
  background: var(--m-bg);
}
.m-mentor-foot input:focus { outline: none; border-color: var(--m-brand); }

/* Teacher dashboard */
.m-student-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--m-sp-3);
}
.m-student-card {
  background: var(--m-bg-elevated);
  border: 1px solid var(--m-border);
  border-radius: var(--m-r-md);
  padding: var(--m-sp-3) var(--m-sp-4);
  cursor: pointer;
  display: flex; align-items: center; gap: var(--m-sp-3);
  transition: border-color 0.15s, transform 0.15s;
}
.m-student-card:hover { border-color: var(--m-brand); transform: translateY(-1px); }
.m-student-avatar {
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--m-brand-light); color: var(--m-brand-dark);
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; font-size: 14px;
  flex-shrink: 0;
}
.m-student-card .m-student-name { font-weight: 500; font-size: 14px; margin: 0; }
.m-student-card .m-student-meta { font-size: 11px; color: var(--m-text-tertiary); margin: 0; }
.m-student-health {
  width: 8px; height: 8px; border-radius: 50%;
  margin-left: auto;
  flex-shrink: 0;
}
.m-student-health.ok { background: #639922; }
.m-student-health.behind { background: #EF9F27; }
.m-student-health.stuck { background: #E24B4A; }

.m-metric {
  background: var(--m-bg-elevated);
  border: 1px solid var(--m-border);
  border-radius: var(--m-r-md);
  padding: var(--m-sp-4);
}
.m-metric-label { font-size: 12px; color: var(--m-text-secondary); margin-bottom: 4px; }
.m-metric-value { font-size: 28px; font-weight: 700; line-height: 1.1; color: var(--m-text); }
.m-metric-trend { font-size: 11px; margin-top: 6px; }
.m-metric-trend.up { color: var(--m-success); }
.m-metric-trend.down { color: var(--m-danger); }