:root {
  --bg: #090b12;
  --surface: #121622;
  --surface-2: #171d2c;
  --line: #273147;
  --text: #edf3ff;
  --muted: #9daac2;
  --blue: #38bdf8;
  --violet: #8b5cf6;
  --green: #34d399;
  --yellow: #fbbf24;
  --red: #fb7185;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: linear-gradient(145deg, #070910 0%, #111827 48%, #0b1020 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

button {
  cursor: pointer;
}

.app-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px 20px;
  border-right: 1px solid var(--line);
  background: rgba(10, 14, 24, 0.92);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 28px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 8px;
  color: #04111d;
  background: linear-gradient(135deg, var(--blue), var(--violet));
  font-weight: 900;
}

.brand strong,
.brand span {
  display: block;
}

.brand span {
  color: var(--muted);
  font-size: 0.9rem;
}

.nav-tabs {
  display: grid;
  gap: 8px;
}

.nav-tab {
  width: 100%;
  padding: 12px 14px;
  color: var(--muted);
  text-align: left;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
}

.nav-tab.active,
.nav-tab:hover {
  color: var(--text);
  border-color: rgba(56, 189, 248, 0.25);
  background: rgba(56, 189, 248, 0.09);
}

.admin-login {
  display: grid;
  gap: 10px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.admin-login p,
.muted {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.admin-login form {
  display: grid;
  gap: 10px;
}

.content {
  width: min(1440px, 100%);
  padding: 28px;
}

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

.eyebrow {
  margin: 0 0 6px;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.7rem, 3vw, 2.7rem);
}

h2 {
  margin-bottom: 0;
  font-size: 1.15rem;
}

.search-wrap {
  width: min(460px, 100%);
}

input,
select,
textarea {
  width: 100%;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #0d1220;
  outline: none;
}

input,
select {
  min-height: 42px;
  padding: 0 12px;
}

textarea {
  padding: 12px;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.14);
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 10;
  max-width: 420px;
  padding: 14px 16px;
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 8px;
  background: #101827;
  box-shadow: var(--shadow);
}

.toast.error {
  border-color: rgba(251, 113, 133, 0.45);
}

.dialog {
  width: min(560px, calc(100vw - 28px));
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.dialog::backdrop {
  background: rgba(0, 0, 0, 0.72);
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(150px, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.stat-card,
.panel,
.device-card,
.loan-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(18, 22, 34, 0.82);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
}

.stat-card {
  padding: 16px;
}

.stat-card span {
  color: var(--muted);
  font-size: 0.86rem;
}

.stat-card strong {
  display: block;
  margin-top: 8px;
  font-size: 2rem;
}

.panel {
  padding: 18px;
}

.panel-head {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.panel-head.wrap {
  flex-wrap: wrap;
}

.two-column,
.split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.split-layout {
  grid-template-columns: 360px 1fr;
  align-items: start;
}

.stacked-form {
  display: grid;
  gap: 13px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 0.88rem;
}

.primary-button,
.ghost-button,
.danger-button,
.soft-button {
  min-height: 40px;
  padding: 0 14px;
  border-radius: 8px;
  font-weight: 800;
}

.primary-button {
  color: #04111d;
  border: 0;
  background: linear-gradient(135deg, var(--blue), var(--violet));
}

.ghost-button,
.soft-button {
  color: var(--text);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.danger-button {
  color: white;
  border: 1px solid rgba(251, 113, 133, 0.35);
  background: rgba(251, 113, 133, 0.16);
}

.filter-row {
  display: flex;
  gap: 10px;
}

.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.device-card {
  overflow: hidden;
}

.device-photo {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #0c1220;
}

.device-body,
.loan-card {
  padding: 14px;
}

.device-top,
.loan-top {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 10px;
}

.device-number {
  color: var(--blue);
  font-weight: 900;
}

.meta {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 0.9rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  color: var(--blue);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.09);
  font-size: 0.82rem;
  font-weight: 800;
}

.pill.available {
  color: var(--green);
  border-color: rgba(52, 211, 153, 0.25);
  background: rgba(52, 211, 153, 0.09);
}

.pill.loaned {
  color: var(--yellow);
  border-color: rgba(251, 191, 36, 0.25);
  background: rgba(251, 191, 36, 0.09);
}

.pill.danger {
  color: var(--red);
  border-color: rgba(251, 113, 133, 0.3);
  background: rgba(251, 113, 133, 0.12);
}

.loan-list,
.compact-list,
.chat-log {
  display: grid;
  gap: 12px;
}

.loan-card.overdue {
  border-color: rgba(251, 113, 133, 0.45);
}

.chat-message {
  padding: 12px;
  border: 1px solid rgba(39, 49, 71, 0.75);
  border-radius: 8px;
  background: rgba(13, 18, 32, 0.72);
}

.chat-message p {
  margin-bottom: 5px;
}

.chat-message time {
  color: var(--muted);
  font-size: 0.8rem;
}

.empty-state {
  padding: 24px;
  color: var(--muted);
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: 8px;
}

[hidden] {
  display: none !important;
}

@media (max-width: 1180px) {
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .two-column,
  .split-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 780px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    padding: 16px;
  }

  .nav-tabs {
    grid-template-columns: repeat(2, 1fr);
  }

  .content {
    padding: 18px;
  }

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

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .filter-row {
    width: 100%;
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .stats-grid,
  .nav-tabs {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 14px;
  }

  .actions {
    display: grid;
  }
}