/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:    #0057b8;
  --blue-lt: #e8f0fb;
  --green:   #107c10;
  --green-lt:#e6f4e6;
  --red:     #c0392b;
  --red-lt:  #fdecea;
  --gray:    #5a5a5a;
  --border:  #dde1e7;
  --bg:      #f4f6f9;
  --white:   #ffffff;
  --shadow:  0 1px 4px rgba(0,0,0,.10);
  --radius:  10px;
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: #1a1a1a;
  min-height: 100vh;
}

/* ── Header ── */
.header {
  background: linear-gradient(135deg, #0057b8 0%, #003c8f 100%);
  color: white;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  flex-wrap: wrap;
}
.header-brand { display: flex; align-items: center; gap: 14px; }
.header-icon  { font-size: 36px; line-height: 1; }
.header-brand h1 { font-size: 20px; font-weight: 700; }
.header-brand p  { font-size: 12px; opacity: .75; margin-top: 2px; }

.header-stats { display: flex; gap: 8px; flex-wrap: wrap; }
.stat {
  background: rgba(255,255,255,.15);
  border-radius: 8px;
  padding: 8px 16px;
  text-align: center;
  min-width: 72px;
}
.stat-ok   { background: rgba(16,124,16,.25); }
.stat-warn { background: rgba(192,57,43,.30); }
.stat-num   { display: block; font-size: 22px; font-weight: 700; }
.stat-label { display: block; font-size: 11px; opacity: .85; }

/* ── Main layout ── */
.main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px 48px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ── Cards ── */
.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  color: #1a1a1a;
}
.card-desc {
  font-size: 13px;
  color: var(--gray);
  margin-bottom: 14px;
}

/* ── Toast ── */
.toast {
  position: fixed;
  top: 80px; right: 24px;
  background: #222;
  color: white;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 999;
  box-shadow: 0 4px 16px rgba(0,0,0,.2);
  max-width: 360px;
  transition: opacity .3s;
}
.toast.ok   { background: var(--green); }
.toast.err  { background: var(--red); }
.toast.hidden { opacity: 0; pointer-events: none; }

/* ── QR Banner ── */
.qr-banner {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #e8f0fb;
  border: 1px solid #b3cdf0;
  border-radius: 6px;
  padding: 10px 14px;
  font-size: 14px;
  margin-bottom: 16px;
}
.qr-banner strong { color: var(--blue); font-size: 15px; }

/* ── Form ── */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 14px;
}
.form-group { display: flex; flex-direction: column; gap: 5px; }
.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: #333;
}
.optional { font-weight: 400; color: var(--gray); }

select, input[type="text"] {
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color .2s;
  background: white;
}
select:focus, input[type="text"]:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(0,87,184,.12);
}

/* ── Status pill ── */
.sel-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 14px;
  margin-bottom: 14px;
  background: var(--blue-lt);
  border: 1px solid #b3cdf0;
}
.sel-status.prestado {
  background: var(--red-lt);
  border-color: #f0b3b3;
}
.sel-status.disponible {
  background: var(--green-lt);
  border-color: #a3d6a3;
}

/* ── Buttons ── */
.btn-group { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  padding: 10px 22px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, transform .1s;
  font-family: inherit;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--blue); color: white; }
.btn-primary:hover { background: #004299; }
.btn-danger  { background: var(--red);  color: white; }
.btn-danger:hover  { background: #992d22; }
.btn-ghost {
  background: white;
  color: #333;
  border: 1.5px solid var(--border);
}
.btn-ghost:hover { background: #f0f0f0; }

/* ── Inventory Grid ── */
.inv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px;
}
.inv-item {
  border-radius: 8px;
  padding: 12px 10px;
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all .15s;
  user-select: none;
}
.inv-item:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,.12); }
.inv-item.disponible {
  background: var(--green-lt);
  border-color: #a3d6a3;
}
.inv-item.prestado {
  background: var(--red-lt);
  border-color: #f0b3b3;
}
.inv-item.selected {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(0,87,184,.2);
}
.inv-codigo {
  font-size: 13px;
  font-weight: 700;
  font-family: 'Courier New', monospace;
  color: #222;
}
.inv-estado {
  font-size: 11px;
  margin-top: 4px;
  font-weight: 600;
}
.disponible .inv-estado { color: var(--green); }
.prestado   .inv-estado { color: var(--red); }
.inv-residente {
  font-size: 10px;
  color: var(--gray);
  margin-top: 3px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── History Table ── */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
th {
  background: #f0f2f5;
  padding: 10px 12px;
  text-align: left;
  font-weight: 600;
  color: #444;
  border-bottom: 2px solid var(--border);
}
td {
  padding: 9px 12px;
  border-bottom: 1px solid #eee;
  color: #333;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: #fafafa; }

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 700;
}
.badge-entregado { background: var(--red-lt);   color: var(--red);   }
.badge-devuelto  { background: var(--green-lt); color: var(--green); }

/* ── Responsive ── */
@media (max-width: 600px) {
  .header { padding: 0 12px; }
  .main   { padding: 14px 10px 40px; }
  .card   { padding: 16px 14px; }
  .header-brand h1 { font-size: 17px; }
}