:root {
  --bg: #111315;
  --panel: #181b20;
  --panel-strong: #20252b;
  --surface: #0d1014;
  --line: rgba(245, 240, 226, 0.12);
  --text: #f4f1e8;
  --muted: #a2a9ad;
  --accent: #d8aa34;
  --cyan: #3aa6b9;
  --green: #38a169;
  --red: #d1495b;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 13px;
  cursor: pointer;
  font-weight: 700;
}

button:hover { border-color: rgba(216, 170, 52, 0.6); }
button:disabled { opacity: 0.55; cursor: not-allowed; }

.primary {
  background: var(--accent);
  color: #15110a;
  border-color: transparent;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  border: 1px solid transparent;
  border-radius: 8px;
  background: var(--accent);
  color: #15110a;
  padding: 10px 13px;
  font-weight: 700;
  text-decoration: none;
}

.ghost { background: transparent; }

.danger {
  border-color: rgba(209, 73, 91, 0.48);
  color: #ffd7dc;
}

.danger:hover {
  border-color: rgba(209, 73, 91, 0.86);
  background: rgba(209, 73, 91, 0.14);
}

input,
select,
textarea {
  width: 100%;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  outline: none;
}

textarea {
  min-height: 92px;
  resize: vertical;
}

label {
  display: flex;
  flex-direction: column;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.field-group {
  display: grid;
  gap: 7px;
}

.field-label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

a { color: var(--accent); }

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    linear-gradient(135deg, rgba(58, 166, 185, 0.15), transparent 34%),
    radial-gradient(circle at 80% 20%, rgba(216, 170, 52, 0.16), transparent 28%),
    var(--bg);
}

.login-shell {
  width: min(980px, 100%);
  display: grid;
  grid-template-columns: 1fr 390px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(24, 27, 32, 0.94);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.login-brand {
  padding: 36px;
  background:
    linear-gradient(160deg, rgba(216, 170, 52, 0.14), transparent 50%),
    var(--panel);
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: #17120a;
  font-weight: 900;
  margin-bottom: 22px;
}

.login-brand h1 {
  margin: 0 0 12px;
  font-size: 32px;
  letter-spacing: 0;
}

.login-brand p,
.muted-line,
small {
  color: var(--muted);
  line-height: 1.45;
}

.login-panel {
  padding: 32px;
  background: var(--surface);
}

.login-panel h2 {
  margin: 0 0 18px;
  font-size: 21px;
}

.form-stack {
  display: grid;
  gap: 14px;
}

.forgot-password {
  justify-self: center;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--accent);
  font-size: 13px;
}

.forgot-password:hover {
  color: #f0c965;
  border-color: transparent;
}

.quick-logins {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 14px;
}

.message {
  min-height: 20px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}

.message[data-kind="error"] { color: var(--red); }
.message[data-kind="ok"] { color: var(--green); }

.topbar {
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 18px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
}

.brand .brand-mark {
  margin: 0;
  width: 32px;
  height: 32px;
}

.top-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  min-width: 0;
}

.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid var(--line);
  padding: 4px 8px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
}

.chip[data-state="ok"] {
  color: #b8f2c9;
  border-color: rgba(56, 161, 105, 0.42);
  background: rgba(56, 161, 105, 0.12);
}

.chip[data-state="warn"] {
  color: #ffe1a3;
  border-color: rgba(216, 170, 52, 0.42);
  background: rgba(216, 170, 52, 0.12);
}

.user-layout {
  height: calc(100vh - 58px);
  display: grid;
  grid-template-columns: 320px 1fr;
  min-height: 0;
}

.user-layout.sidebar-collapsed {
  grid-template-columns: 1fr;
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 16px;
  overflow: auto;
}

.sidebar-section-head,
.workspace-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.workspace-title {
  justify-content: flex-start;
}

.user-layout.sidebar-collapsed .sidebar {
  display: none;
}

.icon-button {
  width: 28px;
  height: 28px;
  padding: 0;
  display: grid;
  place-items: center;
  border-radius: 8px;
}

.compact {
  padding: 7px 10px;
  font-size: 12px;
}

.sidebar h2,
.panel h2 {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0;
  text-transform: uppercase;
}

.stack { display: grid; gap: 10px; }

.map-tile {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 10px;
  text-align: left;
  background: var(--surface);
}

.map-tile strong,
.lesson-row strong,
.admin-row strong {
  display: block;
  margin-bottom: 4px;
}

.map-tile.is-active {
  border-color: var(--accent);
  box-shadow: inset 3px 0 0 var(--accent);
}

.map-tile.is-disabled {
  opacity: 0.68;
}

.workspace {
  min-width: 0;
  min-height: 0;
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr;
  background: #0a0d11;
}

.workspace-bar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-strong);
}

.board-frame {
  width: 100%;
  height: 100%;
  border: 0;
  background: #020617;
}

.viewer-panel {
  margin: 18px;
  display: grid;
  grid-template-rows: auto auto auto;
  gap: 16px;
  align-self: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 18px;
}

.viewer-panel h1 {
  margin: 4px 0 8px;
  font-size: 24px;
  line-height: 1.15;
}

.viewer-status-grid {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) minmax(180px, 1fr);
  gap: 12px;
}

.viewer-status-grid > div {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 12px;
}

.viewer-status-grid small {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 12px;
}

.viewer-status-grid strong {
  display: block;
  overflow-wrap: anywhere;
}

.viewer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.empty-state,
.device-gate {
  margin: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 18px;
}

.device-gate {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: end;
}

.lesson-row,
.admin-row,
.log-row {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 11px;
}

.lesson-row {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 10px;
  text-align: left;
}

.lesson-row:hover {
  border-color: rgba(216, 170, 52, 0.55);
}

.lesson-player {
  margin: 16px;
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(220px, 1fr) auto;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 14px;
}

.lesson-player-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.lesson-player h2 {
  margin: 0 0 6px;
  font-size: 18px;
}

.lesson-player video {
  width: 100%;
  height: min(68vh, 100%);
  min-height: 260px;
  background: #000;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.admin-page {
  min-height: calc(100vh - 58px);
  padding: 18px;
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 14px;
  min-width: 0;
}

.span-12 { grid-column: span 12; }
.span-8 { grid-column: span 8; }
.span-6 { grid-column: span 6; }
.span-4 { grid-column: span 4; }

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}

.metric {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 12px;
}

.metric strong {
  display: block;
  font-size: 25px;
}

.metric span {
  color: var(--muted);
  font-size: 12px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.form-grid.single-column {
  grid-template-columns: 1fr;
}

.full { grid-column: 1 / -1; }

.check-list {
  display: grid;
  gap: 8px;
  max-height: 220px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 8px;
}

.check-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 8px;
  color: var(--text);
  font-size: 13px;
}

.check-row:hover {
  border-color: rgba(216, 170, 52, 0.35);
  background: rgba(255, 255, 255, 0.03);
}

.check-row input {
  width: auto;
  margin-top: 2px;
}

.check-row strong,
.check-row small {
  display: block;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 10px 8px;
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}

td small {
  display: block;
  color: var(--muted);
  margin-top: 4px;
}

th {
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0;
}

.log-row {
  display: grid;
  gap: 4px;
}

.admin-actions,
.form-actions,
.inline-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.form-actions {
  justify-content: flex-start;
}

.inline-actions {
  justify-content: flex-start;
}

.inline-actions select {
  width: auto;
  min-width: 120px;
}

.inline-actions button {
  padding: 8px 10px;
}

.log-row span {
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 980px) {
  .login-shell,
  .user-layout,
  .admin-grid {
    grid-template-columns: 1fr;
  }

  .user-layout { height: auto; }
  .workspace { min-height: 70vh; }
  .span-8,
  .span-6,
  .span-4 { grid-column: span 12; }
  .metric-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  .topbar {
    height: auto;
    min-height: 58px;
    align-items: flex-start;
    flex-direction: column;
    padding: 12px;
  }

  .top-actions,
  .quick-logins,
  .form-grid,
  .metric-grid,
  .viewer-status-grid,
  .device-gate {
    grid-template-columns: 1fr;
  }

  .top-actions {
    display: grid;
    width: 100%;
  }
}