:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #18212f;
  --muted: #687385;
  --line: #d8dee8;
  --primary: #1f6f78;
  --primary-dark: #174e56;
  --accent: #d58b2b;
  --ok: #25815f;
  --warn: #b55338;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
h1, h2, h3 { line-height: 1.35; margin: 0 0 14px; }
small, .muted { color: var(--muted); }
input, select, button, textarea {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 9px 11px;
  font: inherit;
  background: #fff;
}
textarea {
  resize: vertical;
  min-height: 110px;
}
button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: auto;
  min-width: 120px;
  cursor: pointer;
  border: 1px solid var(--line);
  color: var(--ink);
  background: #fff;
  border-radius: 6px;
  padding: 10px 16px;
}
.primary {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}
.primary:hover { background: var(--primary-dark); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  min-height: 64px;
  padding: 0 28px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.brand {
  font-weight: 700;
  color: var(--ink);
}
.topbar nav {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.page {
  width: min(1180px, calc(100% - 32px));
  margin: 28px auto 64px;
}
.flash, .alert {
  padding: 12px 14px;
  margin-bottom: 18px;
  border-radius: 6px;
  background: #fff8e8;
  border: 1px solid #ecd097;
}
.alert {
  background: #fff1ee;
  border-color: #e6b3a7;
}
.login-panel {
  width: min(420px, 100%);
  margin: 80px auto;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.stack {
  display: grid;
  gap: 14px;
}
.grid-form {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  align-items: end;
}
.panel {
  margin: 20px 0;
  padding: 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.kpis {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0;
}
.kpis div {
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.kpis span { display: block; color: var(--muted); }
.kpis strong { font-size: 32px; }
.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  padding: 12px 10px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th { background: #f8fafc; font-weight: 700; }
.badge {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  color: #fff;
  font-size: 13px;
}
.badge.ok { background: var(--ok); }
.badge.warn { background: var(--warn); }
.course-hero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 26px;
  margin: 18px 0;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.progress-ring {
  flex: 0 0 112px;
  height: 112px;
  display: grid;
  place-items: center;
  border: 10px solid #cfe5e8;
  border-top-color: var(--primary);
  border-radius: 50%;
  font-size: 24px;
  font-weight: 700;
}
.lesson-list {
  display: grid;
  gap: 8px;
}
.lesson-row {
  display: grid;
  grid-template-columns: 78px 1fr 140px 76px;
  gap: 12px;
  align-items: center;
  padding: 12px;
  color: var(--ink);
  background: #fbfcfe;
  border: 1px solid var(--line);
  border-radius: 6px;
}
.lesson-row:hover { border-color: var(--primary); }
.lesson-row em {
  font-style: normal;
  color: var(--muted);
  text-align: right;
}
.lesson-row em.done { color: var(--ok); font-weight: 700; }
.lesson-admin {
  display: grid;
  gap: 14px;
  margin-bottom: 18px;
}
.lesson-admin label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}
.lesson-admin-card {
  display: grid;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfe;
}
.lesson-admin-card h4 {
  margin: 0;
  font-size: 15px;
  color: var(--ink);
}
.lesson-view {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, .8fr);
  gap: 20px;
  align-items: start;
}
.eyebrow {
  margin: 8px 0;
  color: var(--primary);
  font-weight: 700;
}
.video-box {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #121820;
  border-radius: 8px;
  overflow: hidden;
}
#player, .video-box iframe {
  width: 100%;
  height: 100%;
}
.video-placeholder {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  color: #fff;
  background: #253142;
}
.material-block {
  margin-top: 20px;
  padding: 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.slide-box {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f8fafc;
}
.slide-box iframe {
  width: 100%;
  height: 100%;
  border: 0;
}
.material-text p {
  margin: 0 0 12px;
}
fieldset {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px;
}
legend { font-weight: 700; }
.choice {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin: 8px 0;
}
.choice input {
  width: auto;
  min-height: auto;
  margin-top: 6px;
}
.certificate {
  width: min(860px, 100%);
  margin: 24px auto;
  padding: 58px;
  background: #fff;
  border: 12px solid #d8c59a;
  text-align: center;
}
.certificate h1 {
  font-size: 42px;
  letter-spacing: 0;
}
.certificate dl {
  width: min(560px, 100%);
  margin: 28px auto;
  text-align: left;
}
.certificate dl div {
  display: grid;
  grid-template-columns: 140px 1fr;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.certificate dt { color: var(--muted); }

@media (max-width: 760px) {
  .topbar { align-items: flex-start; flex-direction: column; padding: 12px 16px; }
  .grid-form, .kpis, .lesson-view, .lesson-admin label { grid-template-columns: 1fr; }
  .course-hero { align-items: flex-start; flex-direction: column; }
  .lesson-row { grid-template-columns: 64px 1fr; }
  .lesson-row small, .lesson-row em { grid-column: 2; text-align: left; }
}

@media print {
  body { background: #fff; }
  .topbar, .print-hide, .flash { display: none !important; }
  .page { width: 100%; margin: 0; }
  .certificate { border-color: #999; box-shadow: none; }
}