:root {
  color-scheme: light;
  --bg: #f3f6fb;
  --surface: rgba(255, 255, 255, 0.94);
  --surface-strong: #ffffff;
  --surface-soft: #edf3fa;
  --text: #112031;
  --muted: #617389;
  --line: #d9e4f1;
  --accent: #1565d8;
  --accent-soft: #e7f0ff;
  --danger: #b42318;
  --danger-soft: #fee4e2;
  --success: #166534;
  --success-soft: #eaf7ef;
  --warning: #9a3412;
  --warning-soft: #fff2e8;
  --shadow: 0 24px 56px rgba(17, 32, 49, 0.08);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(63, 135, 245, 0.1), transparent 32%),
    linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
textarea {
  font: inherit;
}

.hidden {
  display: none !important;
}

.auth-shell,
.app-shell {
  min-height: 100vh;
  padding: 28px;
}

.auth-shell {
  display: grid;
  place-items: center;
}

.auth-card,
.panel,
.person-card {
  border: 1px solid rgba(217, 228, 241, 0.95);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.auth-card {
  width: min(420px, 100%);
  padding: 32px;
  text-align: center;
}

.hero-logo {
  width: 120px;
  height: 120px;
  margin-bottom: 12px;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: 36px;
  line-height: 1;
}

h2 {
  font-size: 24px;
  line-height: 1.1;
}

h3 {
  font-size: 17px;
}

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

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: left;
}

.field span,
.eyebrow,
.person-subtitle,
.admin-user-subtitle,
small {
  color: var(--muted);
}

.field span,
.eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.person-subtitle,
.admin-user-subtitle,
small,
.feedback {
  font-size: 14px;
  line-height: 1.45;
}

input[type="text"],
input[type="password"],
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-strong);
  color: var(--text);
  padding: 12px 14px;
}

input:focus,
textarea:focus {
  outline: 2px solid rgba(21, 101, 216, 0.18);
  border-color: var(--accent);
}

.primary-button,
.ghost-button,
.icon-button {
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, color 120ms ease;
}

.primary-button {
  min-height: 44px;
  padding: 0 18px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.ghost-button {
  min-height: 40px;
  padding: 0 14px;
  background: var(--surface-soft);
  color: var(--text);
  font-weight: 600;
}

.icon-button {
  width: 34px;
  height: 34px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 22px;
  line-height: 1;
}

.primary-button:hover,
.ghost-button:hover,
.icon-button:hover {
  transform: translateY(-1px);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 26px;
}

.brand-block,
.topbar-actions,
.person-header,
.panel-header,
.panel-subheader,
.course-main,
.admin-user-row,
.admin-user-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 68px;
  height: 68px;
  flex: 0 0 auto;
}

.topbar-actions {
  flex-wrap: wrap;
  justify-content: flex-end;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.85);
  color: var(--muted);
}

.save-success {
  color: var(--success);
  background: var(--success-soft);
  border-color: #cde9d4;
}

.save-warning {
  color: var(--warning);
  background: var(--warning-soft);
  border-color: #ffd9bc;
}

.save-error,
.error-text {
  color: var(--danger);
}

.layout {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 22px;
}

.panel {
  padding: 22px;
}

.panel-header,
.panel-subheader {
  justify-content: space-between;
}

.panel-subheader {
  margin: 10px 0 14px;
  font-weight: 700;
}

.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.person-card {
  padding: 18px;
  background: var(--surface-strong);
}

.person-chip,
.admin-user-chip {
  width: 12px;
  height: 52px;
  border-radius: 999px;
  flex: 0 0 auto;
}

.person-copy,
.compact-field {
  flex: 1;
}

.courses-list {
  display: grid;
  gap: 12px;
}

.course-row {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--surface-strong);
}

.weekday-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
  margin-top: 14px;
}

.weekday-toggle {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: capitalize;
}

.weekday-toggle[data-selected="true"] {
  background: var(--accent-soft);
  border-color: rgba(21, 101, 216, 0.34);
  color: var(--accent);
}

.checkbox-field {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.checkbox-field input {
  width: 18px;
  height: 18px;
}

.user-form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.user-form-grid .primary-button {
  align-self: end;
}

.admin-user-row {
  justify-content: space-between;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-strong);
}

.admin-user-subtitle {
  margin: 2px 0 0;
}

.code-preview {
  margin: 16px 0 0;
  padding: 18px;
  overflow: auto;
  border-radius: 8px;
  background: #0f172a;
  color: #d6e3f3;
  font-size: 13px;
  line-height: 1.5;
}

.feedback {
  margin: 0;
}

@media (max-width: 1120px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .auth-shell,
  .app-shell {
    padding: 16px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  h1 {
    font-size: 30px;
  }

  .topbar-actions {
    width: 100%;
    justify-content: flex-start;
  }

  .weekday-grid,
  .user-form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}