/* Reset & Base */
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  color: #172033;
  background-color: #f0fdf4;
  line-height: 1.55;
}
a { color: #047857; text-decoration: none; }

/* 1. Header */
header.lms-header {
  background: #047857;
  color: #ffffff;
  padding: 16px 24px;
}
.lms-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  max-width: 1280px;
  margin: 0 auto;
}
.lms-brand h1 { margin: 0; font-size: 24px; }
.lms-brand p { margin: 2px 0 0; font-size: 13px; color: #d1fae5; }
.badge-student-tier {
  display: inline-block;
  background: #a7f3d0;
  color: #065f46;
  font-size: 11.5px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  margin-right: 10px;
}
.user-score { font-weight: 600; font-size: 13px; color: #ecfdf5; }

/* 2. Nav Flexbox */
nav.lms-nav {
  background: #065f46;
  padding: 0 20px;
}
ul.nav-lms-menu {
  display: flex;
  justify-content: space-around;
  align-items: center;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 10px 0;
}
ul.nav-lms-menu li a {
  color: #ffffff;
  font-weight: 600;
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 4px;
}
ul.nav-lms-menu li a:hover {
  background: #047857;
}

/* 3. Main 2 cột Flexbox */
main.lms-main-dashboard {
  padding: 24px;
  max-width: 1280px;
  margin: 0 auto;
}
.lms-two-columns {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  flex-wrap: wrap;
}
.col-syllabus-panel {
  flex: 1 1 240px;
  background: #ffffff;
  border: 1px solid #a7f3d0;
  border-radius: 8px;
  padding: 18px;
}
.col-syllabus-panel h3 { margin: 0 0 12px; font-size: 16px; color: #065f46; }
.syllabus-steps { margin: 0; padding-left: 20px; }
.syllabus-steps li { margin-bottom: 10px; font-size: 13px; color: #334155; }
.syllabus-steps li strong { color: #047857; }

.col-course-dashboard {
  flex: 3.5 1 660px;
}
.course-progress-hero {
  background: #ffffff;
  border: 1px solid #a7f3d0;
  border-left: 5px solid #047857;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}
.course-tag {
  display: inline-block;
  background: #d1fae5;
  color: #047857;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 6px;
}
.course-progress-hero h2 { margin: 0 0 8px; font-size: 20px; color: #0f172a; }
.course-progress-hero p { margin: 0 0 10px; font-size: 13.5px; color: #475569; }
.course-progress-hero progress { width: 100%; height: 12px; border-radius: 6px; }

/* 6 Thẻ bài học Flexbox không đều nhau */
.modules-flex-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-items: stretch;
  gap: 16px;
}
.module-card {
  background: #ffffff;
  border: 1px solid #a7f3d0;
  border-radius: 8px;
  padding: 16px;
  box-shadow: 0 1px 3px rgba(4, 120, 87, 0.05);
}
.module-card.d1 { flex: 2.8 1 340px; }
.module-card.d2 { flex: 1 1 160px; }
.module-card.d3 { flex: 1.5 1 210px; align-self: flex-start; }
.module-card.d4 { flex: 1.9 1 250px; }
.module-card.d5 { flex: 1.1 1 170px; }
.module-card.d6.urgent-assignment {
  flex: 2.6 1 310px;
  order: -1;
  background: #fffbeb;
  border-color: #fde68a;
}
.module-type-pill {
  display: inline-block;
  font-size: 10.5px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  background: #e0e7ff;
  color: #3730a3;
  margin-bottom: 6px;
}
.alert-pill { background: #fee2e2; color: #b91c1c; }
.module-card h3 { margin: 0 0 6px; font-size: 15px; color: #065f46; }
.module-card p { margin: 0 0 8px; font-size: 13px; color: #475569; }
.module-card small { font-size: 11.5px; color: #64748b; }

/* Display none */
.teacher-notes-hidden { display: none; }

/* 4. Footer 3 cột */
footer.lms-footer {
  background: #064e3b;
  color: #ecfdf5;
  padding: 30px 24px;
  margin-top: 36px;
}
.lms-footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 20px;
  max-width: 1280px;
  margin: 0 auto;
}
.lms-col { flex: 1 1 220px; }
.lms-col h4 { margin: 0 0 10px; font-size: 15px; color: #ffffff; }
.lms-col p { margin: 0; font-size: 13px; color: #a7f3d0; }
.lms-col ul { list-style: none; margin: 0; padding: 0; }
.lms-col ul li { margin-bottom: 6px; font-size: 13px; color: #a7f3d0; }