:root {
  --back-bg: #f4f5f7;
  --back-surface: #ffffff;
  --back-surface-2: #fbfbfa;
  --back-text: #1f2937;
  --back-muted: #6b7280;
  --back-border: #d1d5db;
  --back-primary: #1e1c18;
  --back-accent: #c9a84c;
  --back-accent-soft: #f5eed6;
  --back-radius: 12px;
  --back-shadow: 0 8px 24px rgba(0,0,0,0.06);
  --back-max: 1120px;
  --back-font: 'Source Sans 3', 'Segoe UI', Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  font-family: var(--back-font);
  color: var(--back-text);
  background: var(--back-bg);
  line-height: 1.6;
}

a { color: #8b6a18; }
a:hover { color: var(--back-primary); }

.back-container {
  width: min(100% - 2rem, var(--back-max));
  margin-inline: auto;
}

.back-skip-link {
  position: absolute;
  top: -100%; left: 1rem;
  background: var(--back-primary);
  color: #fff;
  padding: .6rem 1rem;
  border-radius: 8px;
  z-index: 100;
}
.back-skip-link:focus { top: 1rem; }

.back-header {
  background: var(--back-primary);
  color: #fff;
  box-shadow: 0 2px 12px rgba(0,0,0,0.12);
}
.back-header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
}
.back-brand {
  display: flex;
  align-items: center;
  gap: .9rem;
  color: #fff;
  text-decoration: none;
}
.back-brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.12);
  font-weight: 700;
}
.back-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.back-brand-text small {
  color: rgba(255,255,255,0.72);
}

.back-header-user {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.back-user-meta {
  display: flex;
  flex-direction: column;
  text-align: right;
}
.back-user-meta span {
  color: rgba(255,255,255,0.72);
  font-size: .9rem;
}

.back-main {
  min-height: calc(100vh - 145px);
}

.back-footer {
  border-top: 1px solid var(--back-border);
  background: #fcfcfb;
}
.back-footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
  font-size: .92rem;
  color: var(--back-muted);
}

.back-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .75rem 1rem;
  border-radius: 10px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
}
.back-btn--primary {
  background: var(--back-primary);
  color: #fff;
}
.back-btn--primary:hover { background: #2a2722; }
.back-btn--ghost {
  background: rgba(255,255,255,0.08);
  color: #fff;
  border-color: rgba(255,255,255,0.18);
}
.back-btn--ghost:hover { background: rgba(255,255,255,0.14); }
.back-btn--full { width: 100%; }

.back-login-wrap {
  min-height: calc(100vh - 210px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}
.back-login-card {
  width: 100%;
  max-width: 520px;
  background: var(--back-surface);
  border: 1px solid var(--back-border);
  border-radius: 16px;
  box-shadow: var(--back-shadow);
  padding: 2rem;
}
.back-login-badge {
  display: inline-flex;
  margin: 0 0 1rem;
  padding: .35rem .8rem;
  border-radius: 999px;
  background: var(--back-accent-soft);
  color: var(--back-primary);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.back-login-card h1 {
  margin: 0 0 .75rem;
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  line-height: 1.15;
}
.back-login-intro {
  margin: 0 0 1.5rem;
  color: var(--back-muted);
}
.back-form {
  display: grid;
  gap: 1rem;
}
.back-field {
  display: grid;
  gap: .45rem;
}
.back-field label {
  font-weight: 600;
}
.back-field input {
  width: 100%;
  padding: .85rem .95rem;
  border: 1px solid var(--back-border);
  border-radius: 10px;
  font: inherit;
  background: #fff;
}
.back-field input:focus {
  outline: 2px solid #d6c08a;
  outline-offset: 2px;
  border-color: #b59b4f;
}
.back-alert {
  padding: .9rem 1rem;
  border-radius: 10px;
  margin-bottom: 1rem;
  font-weight: 500;
}
.back-alert--error {
  background: #fff1f2;
  border: 1px solid #fecdd3;
  color: #9f1239;
}
.back-login-return {
  margin: 1.25rem 0 0;
  font-size: .95rem;
}

.back-dashboard-head {
  padding: 2rem 0 1rem;
}
.back-dashboard-head h1 {
  margin: 0 0 .5rem;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
}
.back-dashboard-head p {
  margin: 0;
  color: var(--back-muted);
}

.back-dashboard-section {
  padding: 1rem 0 2rem;
}
.back-dashboard-section--light {
  padding-top: 0;
}
.back-tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.back-tile {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  text-decoration: none;
  color: inherit;
  background: var(--back-surface);
  border: 1px solid var(--back-border);
  border-radius: 14px;
  box-shadow: var(--back-shadow);
  padding: 1.2rem;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}
.back-tile:hover {
  transform: translateY(-2px);
  border-color: #b59b4f;
  box-shadow: 0 14px 28px rgba(0,0,0,0.08);
}
.back-tile-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--back-accent-soft);
  color: var(--back-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}
.back-tile-body h2 {
  margin: 0 0 .35rem;
  font-size: 1.05rem;
}
.back-tile-body p {
  margin: 0;
  color: var(--back-muted);
  font-size: .95rem;
}

.back-dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.back-panel {
  background: var(--back-surface);
  border: 1px solid var(--back-border);
  border-radius: 14px;
  padding: 1.25rem;
}
.back-panel h2,
.back-panel h1 {
  margin-top: 0;
}
.back-list {
  display: grid;
  gap: .5rem;
  padding-left: 0;
  margin: 0;
  list-style: none;
}

@media (max-width: 780px) {
  .back-header-inner,
  .back-footer-inner,
  .back-header-user {
    flex-direction: column;
    align-items: flex-start;
  }
  .back-user-meta { text-align: left; }
  .back-dashboard-grid { grid-template-columns: 1fr; }
  .back-login-card { padding: 1.5rem; }
}
.back-grid--2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

.back-panel--nested {
  margin-top: 1.5rem;
}

.back-form {
  display: grid;
  gap: 1rem;
}

.back-form-field {
  display: grid;
  gap: 0.35rem;
}

.back-form-field input,
.back-form-field select,
.back-form-field textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1px solid #d4d7dd;
  border-radius: 0.5rem;
  background: #fff;
}

.back-fieldset {
  border: 1px solid #e3e7ee;
  border-radius: 0.75rem;
  padding: 1rem;
  display: grid;
  gap: 0.75rem;
}

.back-checkbox {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.back-alert {
  padding: 1rem 1.25rem;
  border-radius: 0.75rem;
  margin-bottom: 1rem;
}

.back-alert--success {
  background: #e8f6ee;
  color: #1f6b43;
}

.back-alert--error {
  background: #fdecec;
  color: #9b2226;
}

.back-table {
  width: 100%;
  border-collapse: collapse;
}

.back-table th,
.back-table td {
  padding: 0.75rem;
  border-bottom: 1px solid #e5e7eb;
  text-align: left;
}

@media (max-width: 900px) {
  .back-grid--2 {
    grid-template-columns: 1fr;
  }
}
.back-tile--static {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  text-decoration: none;
  cursor: default;
}
.back-workspace {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 1.25rem;
  align-items: start;
}

.back-workspace-nav {
  display: grid;
  gap: 1rem;
}

.back-workspace-content {
  min-width: 0;
}

.back-workspace-panel[hidden] {
  display: none !important;
}

.back-tile--action {
  width: 100%;
  text-align: left;
  cursor: pointer;
}

.back-tile--action.is-active {
  border-color: #b59b4f;
  box-shadow: 0 14px 28px rgba(0,0,0,0.08);
  background: #fffdf7;
}

.back-tile--action.is-active .back-tile-icon {
  background: #efe3b8;
}

@media (max-width: 980px) {
  .back-workspace {
    grid-template-columns: 1fr;
  }
}
.back-list-select {
  display: grid;
  gap: .75rem;
}

.back-select-card {
  width: 100%;
  text-align: left;
  border: 1px solid var(--back-border);
  border-radius: 12px;
  background: #fff;
  padding: 1rem;
  cursor: pointer;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.back-select-card:hover {
  border-color: #b59b4f;
  box-shadow: 0 10px 22px rgba(0,0,0,0.06);
  transform: translateY(-1px);
}

.back-select-card.is-selected {
  border-color: #b59b4f;
  background: #fffdf7;
  box-shadow: 0 12px 24px rgba(0,0,0,0.06);
}