/* App shell: sidebar, topbar, page header, content, mobile drawer, login and error pages. */
.shell { display: grid; grid-template-columns: var(--sidebar) minmax(0, 1fr); min-height: 100vh; }

.sidebar {
  position: sticky; top: 0; height: 100vh; overflow-y: auto; z-index: 40;
  display: flex; flex-direction: column;
  background: var(--side-bg); color: var(--side-ink); border-right: 1px solid var(--side-hover);
}
.sidebar :focus-visible { outline-color: var(--on-dark); }
.brand {
  display: flex; flex-direction: column; gap: var(--space-1);
  padding: var(--space-4) var(--space-4) var(--space-3);
  border-bottom: 1px solid var(--side-line); text-decoration: none;
}
.brand-logo { height: 40px; width: auto; }
.brand-sub { font-size: var(--text-xs); letter-spacing: 0.14em; color: var(--side-ink-muted); font-weight: 700; }
.nav { flex: 1; padding: var(--space-2) var(--space-3); }
.nav ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.nav-section {
  padding: var(--space-4) var(--space-3) var(--space-1); color: var(--side-ink-muted);
  font-size: var(--text-xs); font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase;
}
.nav-link {
  display: flex; align-items: center; gap: var(--space-3); min-height: 40px;
  padding: var(--space-2) var(--space-3); border-radius: 9px;
  color: var(--side-link); text-decoration: none; font-weight: 500;
}
.nav-link:hover { background: var(--side-hover); color: var(--on-dark); }
.nav-link[aria-current="page"] {
  background: var(--side-active); color: var(--on-dark); font-weight: 600; box-shadow: inset 3px 0 0 var(--danger);
}
.nav-link .icon { width: 18px; height: 18px; }
.sidebar-footer { display: grid; gap: var(--space-2); padding: var(--space-3); border-top: 1px solid var(--side-line); }
.sidebar-footer form { margin: 0; }
.user-mini {
  display: flex; align-items: center; gap: var(--space-2); min-width: 0;
  padding: var(--space-2); border-radius: 10px; background: var(--side-fill);
}
.user-text { display: grid; min-width: 0; }
.user-name { font-size: var(--text-sm); font-weight: 700; color: var(--on-dark); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-role { font-size: var(--text-xs); color: var(--side-ink-muted); font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.btn-logout {
  width: 100%; min-height: 40px; display: flex; align-items: center; justify-content: center; gap: var(--space-2);
  border: 1px solid var(--side-border); background: var(--side-fill); color: var(--side-link);
  border-radius: 9px; font-size: var(--text-sm); font-weight: 600;
}
.btn-logout:hover { background: var(--side-press); color: var(--on-dark); }
.sidebar-backdrop { display: none; }
.brand-mark { display: none; width: 38px; height: 38px; }
.brand, .nav-link, .btn-logout, .user-mini { position: relative; }

.main { display: flex; flex-direction: column; min-width: 0; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
  min-height: 68px; padding: var(--space-2) var(--space-7);
  background: var(--topbar); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px);
}
.topbar-left { display: flex; align-items: center; gap: var(--space-3); min-width: 0; }
.topbar .nav-toggle { display: none; }
.topbar .nav-collapse { display: inline-flex; }
.page-header { min-width: 0; }
.page-header h1 { font-size: var(--text-lg); letter-spacing: -0.35px; }
.page-subtitle { color: var(--mut); font-size: var(--text-sm); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.page-subtitle:empty { display: none; }
.top-actions { display: flex; align-items: center; gap: var(--space-2); flex-shrink: 0; }
.contract-picker { display: flex; align-items: center; gap: var(--space-2); margin: 0; }
.contract-picker label { color: var(--mut); font-size: var(--text-sm); font-weight: 600; }
.contract-picker select { max-width: 18rem; }
.avatar {
  display: grid; place-items: center; width: 32px; height: 32px; flex: 0 0 32px; border-radius: 50%;
  background: var(--ac-soft); color: var(--ac-dark); font-weight: 800; font-size: var(--text-xs);
}
.content { width: 100%; max-width: 100rem; padding: var(--space-6) var(--space-7) var(--space-8); }
.content:focus { outline: none; }

.messages { list-style: none; margin: var(--space-4) var(--space-7) 0; padding: 0; display: grid; gap: var(--space-2); }
.messages li {
  padding: var(--space-3) var(--space-4); border-radius: var(--radius-sm);
  border: 1px solid var(--info-border); background: var(--info-soft); color: var(--info-ink);
}
.messages .success { border-color: var(--success-border); background: var(--success-soft); color: var(--success-ink); }
.messages .warning { border-color: var(--warn-border); background: var(--warn-soft); color: var(--warn-ink); }
.messages .error { border-color: var(--danger-border); background: var(--danger-soft); color: var(--danger-ink); }

.login { min-height: 100vh; display: grid; place-items: center; padding: var(--space-6) var(--space-4); }
.login-card {
  width: min(430px, 100%); padding: var(--space-8) var(--space-7);
  background: var(--surface); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow-lg);
}
.login-brand { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-2); }
.login-brand h1 { font-size: 20px; letter-spacing: -0.4px; }
.login-brand small { display: block; font-size: var(--text-xs); color: var(--mut); font-weight: 700; letter-spacing: 0.06em; }
.login-card form { display: grid; gap: var(--space-3); }
.login-card .btn { width: 100%; min-height: 46px; margin-top: var(--space-2); }
.form-error {
  padding: var(--space-3) 14px; border-left: 3px solid var(--danger);
  background: var(--danger-soft); color: var(--danger-ink); font-size: var(--text-sm);
}

.error-page { display: grid; gap: var(--space-4); justify-items: start; max-width: 36rem; }
.error-page--bare { margin: 12vh auto 0; padding: 0 var(--space-4); }

@media (max-width: 74rem) {
  .topbar { padding-left: var(--space-5); padding-right: var(--space-5); }
  .content { padding-left: var(--space-5); padding-right: var(--space-5); }
  .messages { margin-left: var(--space-5); margin-right: var(--space-5); }
}

@media (max-width: 48rem) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .sidebar {
    position: fixed; inset: 0 auto 0 0; width: 264px; height: auto;
    transform: translateX(-100%); visibility: hidden;
    transition: transform 0.24s ease, visibility 0s linear 0.24s;
  }
  .shell.nav-open .sidebar { transform: none; visibility: visible; transition: transform 0.24s ease; box-shadow: 0 0 40px var(--drawer-shadow); }
  .shell.nav-open .sidebar-backdrop { display: block; position: fixed; inset: 0; z-index: 35; background: var(--drawer-scrim); }
  .topbar .nav-toggle { display: inline-flex; }
  .topbar .nav-collapse { display: none; }
  .topbar { min-height: 60px; padding: var(--space-2) var(--space-4); }
  .page-header h1 { font-size: 16px; }
  .page-subtitle { display: none; }
  .contract-picker label {
    position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
  }
  .contract-picker select { max-width: 9rem; }
  .top-actions .avatar { display: none; }
  .content { padding: var(--space-4) var(--space-4) var(--space-7); }
  .messages { margin: var(--space-3) var(--space-4) 0; }
}

@media (max-width: 28rem) {
  .login-card { padding: var(--space-6) var(--space-5); }
}

/* Desktop rail (4b). Never applies on phones, where the drawer shows full labels. */
@media (width > 48rem) {
  .nav-collapsed .shell { grid-template-columns: var(--sidebar-collapsed) minmax(0, 1fr); }
  .nav-collapsed .sidebar { overflow: visible; }
  .nav-collapsed .brand { align-items: center; padding: var(--space-4) 0; }
  .nav-collapsed .brand-mark { display: block; }
  .nav-collapsed .brand-logo, .nav-collapsed .brand-sub { display: none; }
  .nav-collapsed .nav { padding: var(--space-2); }
  .nav-collapsed .nav-section {
    height: 1px; margin: 9px var(--space-3); padding: 0; overflow: hidden;
    color: transparent; background: var(--side-press);
  }
  .nav-collapsed .nav-text, .nav-collapsed .user-text {
    position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
  }
  .nav-collapsed .nav-link, .nav-collapsed .btn-logout { justify-content: center; padding-left: 0; padding-right: 0; }
  .nav-collapsed .user-mini { justify-content: center; padding: var(--space-1) 0; background: transparent; }
  .nav-collapsed [data-tip]:hover::after,
  .nav-collapsed [data-tip]:focus-visible::after {
    content: attr(data-tip); position: absolute; left: 100%; top: 50%; transform: translateY(-50%);
    z-index: 100; padding: 6px 10px; border-left: 12px solid transparent; background-clip: padding-box;
    border-radius: 6px; background: var(--toast); color: var(--on-dark);
    font-size: var(--text-xs); font-weight: 600; white-space: nowrap; box-shadow: var(--shadow-md);
  }
}