:root {
  --bg: #eef2f3;
  --surface: #fbfcfd;
  --surface-strong: #ffffff;
  --ink: #1d252c;
  --muted: #65717a;
  --line: #d7dee3;
  --accent: #156f6b;
  --accent-dark: #0f514f;
  --accent-soft: #d9eeea;
  --warning: #a95d16;
  --locked: #a9a49c;
  --shadow: 0 24px 70px rgba(29, 37, 44, 0.12);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(21, 111, 107, 0.08) 1px, transparent 1px),
    linear-gradient(180deg, rgba(21, 111, 107, 0.08) 1px, transparent 1px),
    var(--bg);
  background-size: 42px 42px;
  font-family:
    Inter, "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Arial, sans-serif;
}

button,
input,
table {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
}

.is-hidden {
  display: none !important;
}

.login-view {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(760px, 100%);
  padding: clamp(28px, 6vw, 64px);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

.login-panel h1,
.topbar h1 {
  margin-bottom: 14px;
  font-size: clamp(1.65rem, 3.5vw, 3rem);
  line-height: 1.06;
}

.login-copy {
  max-width: 610px;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.55;
}

.name-form {
  margin-top: 34px;
}

.name-form label,
.auth-form label {
  display: block;
  margin-bottom: 10px;
  font-weight: 800;
}

.name-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

input {
  width: 100%;
  min-height: 48px;
  padding: 0 14px;
  color: var(--ink);
  background: var(--surface-strong);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

input:focus,
button:focus-visible,
.lesson-button:focus-visible {
  outline: 3px solid rgba(21, 111, 107, 0.28);
  outline-offset: 2px;
}

button {
  min-height: 44px;
  padding: 0 18px;
  color: #ffffff;
  background: var(--accent);
  border: 0;
  border-radius: var(--radius);
  font-weight: 800;
}

button:hover {
  background: var(--accent-dark);
}

.ghost-button {
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
}

.ghost-button:hover {
  color: var(--accent-dark);
  background: var(--accent-soft);
}

.primary-button {
  background: var(--accent);
}

.button-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  color: #ffffff;
  background: var(--accent);
  border-radius: var(--radius);
  font-weight: 800;
  text-decoration: none;
}

.ghost-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-weight: 800;
  text-decoration: none;
}

.ghost-link:hover {
  color: var(--accent-dark);
  background: var(--accent-soft);
}

.button-link:hover {
  background: var(--accent-dark);
}

.form-error {
  min-height: 22px;
  margin: 10px 0 0;
  color: #a12727;
  font-weight: 700;
}

.saved-users {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.saved-users button {
  min-height: 38px;
  color: var(--accent-dark);
  background: var(--accent-soft);
}

.auth-tabs {
  display: inline-flex;
  gap: 6px;
  margin-top: 28px;
  padding: 5px;
  background: #e4ebee;
  border-radius: var(--radius);
}

.tab-button {
  min-height: 38px;
  color: var(--muted);
  background: transparent;
}

.tab-button:hover,
.tab-button.is-active {
  color: #ffffff;
  background: var(--accent);
}

.auth-form {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.auth-form button {
  margin-top: 8px;
}

.course-view {
  min-height: 100vh;
  padding: clamp(16px, 3vw, 32px);
}

.admin-view {
  min-height: 100vh;
  padding: clamp(16px, 3vw, 32px);
}

.topbar {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  justify-content: space-between;
  padding-bottom: 20px;
}

.topbar h1 {
  font-size: clamp(1.45rem, 2.4vw, 2.35rem);
}

#loginTitle {
  font-size: clamp(1.7rem, 3vw, 2.7rem);
  line-height: 1.05;
}

.course-view .topbar h1,
.admin-view .topbar h1 {
  font-size: clamp(1.45rem, 2.2vw, 2.15rem);
  line-height: 1.08;
}

#passwordTitle {
  font-size: clamp(1.45rem, 2.6vw, 2.2rem);
}

.user-box {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: flex-end;
  color: var(--muted);
  font-weight: 800;
  text-align: right;
}

.progress-band {
  display: grid;
  grid-template-columns: auto minmax(180px, 1fr);
  gap: 18px;
  align-items: center;
  margin-bottom: 20px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.progress-number {
  display: block;
  font-size: 1.8rem;
  font-weight: 900;
}

.progress-label {
  color: var(--muted);
  font-weight: 700;
}

.progress-track {
  height: 13px;
  overflow: hidden;
  background: #dbe3e7;
  border-radius: 999px;
}

.progress-track span {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #6da646);
  transition: width 220ms ease;
}

.course-picker {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.course-card {
  display: grid;
  gap: 10px;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 34px rgba(29, 37, 44, 0.07);
}

.course-card.is-active {
  border-color: rgba(21, 111, 107, 0.55);
  box-shadow: 0 0 0 3px rgba(21, 111, 107, 0.14);
}

.course-card.is-complete {
  background: linear-gradient(180deg, #ffffff, #eef8f5);
}

.course-card button {
  display: grid;
  gap: 7px;
  min-height: 126px;
  padding: 0;
  color: var(--ink);
  background: transparent;
  text-align: left;
}

.course-card button:hover {
  color: var(--accent-dark);
  background: transparent;
}

.course-card span,
.course-card em,
.course-card small {
  color: var(--muted);
  font-size: 0.82rem;
  font-style: normal;
  font-weight: 800;
}

.course-card small {
  line-height: 1.35;
}

.course-card strong {
  font-size: 1.16rem;
  line-height: 1.15;
}

.course-certificate-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  color: #ffffff;
  background: var(--accent);
  border-radius: var(--radius);
  font-size: 0.86rem;
  font-weight: 900;
  text-decoration: none;
}

.course-certificate-link:hover {
  background: var(--accent-dark);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(300px, 390px) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.course-nav,
.player-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 14px 44px rgba(29, 37, 44, 0.08);
}

.course-nav {
  max-height: calc(100vh - 188px);
  overflow: auto;
  padding: 16px;
}

.nav-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.nav-heading h2 {
  margin: 0;
  font-size: 1.1rem;
}

.nav-heading span {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
}

.course-group {
  border-top: 1px solid var(--line);
  padding: 14px 0;
}

.course-group:first-child {
  border-top: 0;
}

.course-group h3 {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 10px;
  font-size: 0.98rem;
}

.course-group h3 span {
  color: var(--muted);
  white-space: nowrap;
}

.lesson-list {
  display: grid;
  gap: 7px;
}

.lesson-button {
  display: grid;
  width: 100%;
  grid-template-columns: 34px minmax(0, 1fr) 24px;
  gap: 10px;
  align-items: center;
  min-height: 48px;
  padding: 8px 10px;
  color: var(--ink);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  text-align: left;
}

.lesson-button:hover:not(:disabled),
.lesson-button.is-active {
  background: var(--accent-soft);
  border-color: rgba(21, 111, 107, 0.25);
}

.lesson-button:disabled {
  color: var(--locked);
  cursor: not-allowed;
}

.lesson-index {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  background: #e7edf0;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 900;
}

.lesson-title-small {
  overflow: hidden;
  font-size: 0.9rem;
  font-weight: 800;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-mark {
  color: var(--accent);
  font-weight: 900;
  text-align: center;
}

.lesson-button:disabled .lesson-mark {
  color: var(--locked);
}

.player-panel {
  min-height: 620px;
  padding: clamp(16px, 3vw, 28px);
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 900;
  text-transform: uppercase;
}

#lessonTitle {
  margin-bottom: 18px;
  font-size: clamp(1.4rem, 3vw, 2.4rem);
  line-height: 1.08;
}

video {
  display: block;
  width: 100%;
  max-height: 62vh;
  aspect-ratio: 16 / 9;
  background: #111820;
  border-radius: var(--radius);
}

.player-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  margin-top: 18px;
}

.player-actions p {
  margin: 0;
  color: var(--muted);
  font-weight: 800;
}

.certificate-view {
  min-height: 100vh;
  padding: 24px;
  background: #e8eef0;
}

.admin-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.admin-summary div {
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.admin-summary strong {
  display: block;
  font-size: 2rem;
  line-height: 1;
}

.admin-summary span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-weight: 800;
}

.admin-panel {
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 14px 44px rgba(29, 37, 44, 0.08);
}

.audit-panel {
  margin-top: 20px;
}

.admin-table-wrap {
  overflow-x: auto;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 920px;
}

.admin-table th,
.admin-table td {
  padding: 14px 12px;
  border-top: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.admin-table th {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.admin-table td strong,
.admin-table td span {
  display: block;
}

.admin-table td span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.mini-progress {
  width: 160px;
  height: 8px;
  overflow: hidden;
  margin-bottom: 7px;
  background: #dbe3e7;
  border-radius: 999px;
}

.mini-progress span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #6da646);
}

.admin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.admin-actions button {
  min-height: 34px;
  padding: 0 10px;
  color: var(--accent-dark);
  background: var(--accent-soft);
  font-size: 0.84rem;
}

.certificate-links {
  display: grid;
  gap: 5px;
}

.certificate-links a {
  color: var(--accent-dark);
  font-weight: 900;
  text-decoration: none;
}

.certificate-links a:hover {
  text-decoration: underline;
}

.muted-certificate {
  color: var(--locked);
}

.certificate-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-bottom: 18px;
}

.certificate {
  width: min(100%, 980px);
  min-height: 690px;
  margin: 0 auto;
  padding: 58px clamp(34px, 6vw, 76px);
  background:
    linear-gradient(135deg, transparent 0 76%, rgba(21, 111, 107, 0.1) 76%),
    var(--surface-strong);
  border: 12px solid #eef3f5;
  outline: 2px solid var(--accent);
  box-shadow: var(--shadow);
  text-align: center;
}

.certificate-header {
  max-width: 760px;
  margin: 0 auto 30px;
}

.certificate-kicker {
  margin-bottom: 16px;
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.certificate h1 {
  margin-bottom: 0;
  font-size: clamp(2rem, 4.8vw, 3.55rem);
  line-height: 1.02;
}

.certificate h1 span {
  display: block;
}

.certificate h1 span + span {
  margin-top: 12px;
  color: var(--accent-dark);
  font-size: 0.58em;
  line-height: 1.16;
}

.certificate h2 {
  margin: 24px 0 18px;
  font-size: clamp(1.85rem, 4vw, 2.8rem);
  line-height: 1.1;
}

.certificate-issued {
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.45;
}

.certificate-course {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  max-width: 620px;
  margin: 18px auto 36px;
  padding: 10px 18px;
  color: var(--ink);
  background: rgba(238, 248, 245, 0.7);
  border: 1px solid rgba(21, 111, 107, 0.18);
  border-radius: 999px;
  font-size: 1.05rem;
  font-weight: 900;
}

.certificate-course::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-right: 10px;
  background: var(--accent);
  border-radius: 50%;
}

.certificate-date {
  margin: 0;
  color: var(--ink);
  font-weight: 800;
}

.certificate-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 760px;
  margin: 0 auto 32px;
}

.certificate-metrics div {
  display: grid;
  align-content: start;
  min-height: 128px;
  padding: 18px 14px;
  background: #eef8f5;
  border: 1px solid rgba(21, 111, 107, 0.22);
  border-radius: var(--radius);
}

.certificate-metrics strong,
.certificate-metrics span {
  display: block;
}

.certificate-metrics strong {
  font-size: 1.22rem;
  line-height: 1.18;
}

.certificate-metrics span {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 800;
  line-height: 1.25;
}

.certificate-footer {
  display: grid;
  gap: 8px;
  justify-items: center;
  color: var(--muted);
  font-size: 0.96rem;
  font-weight: 800;
}

.certificate-footer p {
  margin-bottom: 0;
}

@media (max-width: 900px) {
  .topbar,
  .player-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .user-box {
    justify-content: flex-start;
    text-align: left;
  }

  .progress-band,
  .workspace,
  .course-picker {
    grid-template-columns: 1fr;
  }

  .admin-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .course-nav {
    max-height: none;
  }

  .certificate {
    padding: 44px 24px;
  }

  .certificate-metrics {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .name-row {
    grid-template-columns: 1fr;
  }

  .course-view {
    padding: 12px;
  }

  .admin-view {
    padding: 12px;
  }

  .admin-summary {
    grid-template-columns: 1fr;
  }

  .lesson-button {
    grid-template-columns: 30px minmax(0, 1fr) 20px;
  }
}

@media print {
  @page {
    size: A4;
    margin: 10mm;
  }

  body {
    background: #ffffff;
  }

  .login-view,
  .course-view,
  .admin-view,
  #passwordView,
  .certificate-actions {
    display: none !important;
  }

  .certificate-view {
    display: block !important;
    min-height: auto;
    padding: 0;
    background: #ffffff;
  }

  .certificate {
    width: 100%;
    min-height: 100vh;
    box-shadow: none;
    page-break-inside: avoid;
  }
}