:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --primary: #0ea5e9;
  --primary-hover: #0284c7;
  --danger: #ef4444;
  --success: #22c55e;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
}

* { box-sizing: border-box; }
body { margin: 0; font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; background: var(--bg); color: var(--text); line-height: 1.5; }
.hidden { display: none !important; }

#login-screen {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(160deg, #e0f2fe 0%, #f0f9ff 50%, #f8fafc 100%);
}
.login-card {
  background: var(--surface); padding: 2.5rem; border-radius: 16px; box-shadow: var(--shadow-md);
  width: 100%; max-width: 380px;
}
.login-card h1 { margin: 0; font-size: 1.5rem; font-weight: 600; color: var(--text); }
.login-subtitle { color: var(--text-muted); font-size: 0.9rem; margin: 0.5rem 0 1.5rem; }
.login-card label { display: block; margin-bottom: 1rem; font-size: 0.9rem; font-weight: 500; color: var(--text); }
.login-card input {
  width: 100%; padding: 0.65rem 0.85rem; margin-top: 0.35rem;
  border: 1px solid var(--border); border-radius: 8px; font-size: 1rem;
}
.login-card input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(14,165,233,0.15); }
.login-card button {
  width: 100%; padding: 0.75rem; margin-top: 0.5rem;
  background: var(--primary); color: #fff; border: none; border-radius: 8px; font-size: 1rem; font-weight: 500; cursor: pointer;
}
.login-card button:hover { background: var(--primary-hover); }
.error-msg { color: var(--danger); font-size: 0.875rem; margin-top: 0.75rem; }

.app-header {
  background: var(--surface); border-bottom: 1px solid var(--border); padding: 0.75rem 1.5rem;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
}
.app-header h1 { margin: 0; font-size: 1.25rem; font-weight: 600; }
.app-nav { display: flex; align-items: center; gap: 0.25rem; flex-wrap: wrap; }
.nav-link {
  color: var(--text-muted); text-decoration: none; padding: 0.5rem 0.85rem; border-radius: 8px; font-size: 0.9rem;
}
.nav-link:hover { color: var(--text); background: var(--bg); }
.nav-link.active { color: var(--primary); background: #e0f2fe; font-weight: 500; }
.nav-admin { }
.btn-logout {
  background: transparent; color: var(--text-muted); border: 1px solid var(--border);
  padding: 0.45rem 0.85rem; border-radius: 8px; font-size: 0.9rem; cursor: pointer; margin-left: 0.5rem;
}
.btn-logout:hover { color: var(--text); background: var(--bg); }

.app-main { max-width: 1280px; margin: 0 auto; padding: 1.5rem; }
.page { display: none; min-height: 60vh; }
.page.active { display: block; }

.page-toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.25rem; flex-wrap: wrap; gap: 0.75rem; }
.page-toolbar h2 { margin: 0; font-size: 1.35rem; font-weight: 600; color: var(--text); }
.card { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--border); }
th { background: #f8fafc; font-weight: 600; font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.03em; }
tr:hover { background: #f8fafc; }
.empty { padding: 2.5rem; text-align: center; color: var(--text-muted); }

.btn { display: inline-flex; align-items: center; padding: 0.5rem 1rem; border-radius: 8px; font-size: 0.9rem; font-weight: 500; cursor: pointer; border: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: var(--bg); }
.btn-sm { padding: 0.35rem 0.65rem; font-size: 0.8rem; margin-right: 0.35rem; }
.btn-danger { border-color: var(--danger); color: var(--danger); }
.btn-danger:hover { background: #fef2f2; }
.toolbar-gap { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
.toolbar-gap input, .toolbar-gap select { padding: 0.5rem 0.75rem; border: 1px solid var(--border); border-radius: 8px; font-size: 0.9rem; min-width: 160px; }

.modal { position: fixed; inset: 0; z-index: 1000; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(15,23,42,0.4); }
.modal-box {
  position: relative; background: var(--surface); border-radius: 14px; max-width: 520px; width: 100%;
  max-height: 90vh; overflow: auto; box-shadow: 0 20px 50px rgba(0,0,0,0.15);
}
.modal-head { display: flex; justify-content: space-between; align-items: center; padding: 1.25rem 1.5rem; border-bottom: 1px solid var(--border); }
.modal-head h2 { margin: 0; font-size: 1.15rem; font-weight: 600; }
.modal-close { background: none; border: none; font-size: 1.5rem; color: var(--text-muted); cursor: pointer; line-height: 1; padding: 0 0.25rem; }
.modal-close:hover { color: var(--text); }
.modal-body { padding: 1.5rem; }
.modal-body label { display: block; margin-bottom: 0.85rem; font-size: 0.9rem; font-weight: 500; }
.modal-body input, .modal-body select, .modal-body textarea {
  width: 100%; padding: 0.55rem 0.8rem; margin-top: 0.3rem; border: 1px solid var(--border); border-radius: 8px; font-size: 1rem;
}
.modal-actions { margin-top: 1.25rem; display: flex; gap: 0.5rem; justify-content: flex-end; }
.modal-actions .btn { min-width: 90px; }

.badge { display: inline-block; padding: 0.2rem 0.5rem; border-radius: 6px; font-size: 0.75rem; font-weight: 500; }
.badge-new { background: #e0f2fe; color: #0369a1; }
.badge-collected { background: #fef3c7; color: #b45309; }
.badge-washing { background: #e0e7ff; color: #4338ca; }
.badge-done { background: #d1fae5; color: #047857; }
.badge-free { background: #d1fae5; color: #047857; }
.badge-used { background: #fee2e2; color: #b91c1c; }

.stats-row { display: flex; gap: 1rem; margin-bottom: 1.25rem; flex-wrap: wrap; }
.stat-card { background: var(--surface); padding: 1rem 1.25rem; border-radius: var(--radius); box-shadow: var(--shadow); min-width: 140px; }
.stat-card .value { font-size: 1.5rem; font-weight: 700; color: var(--text); }
.stat-card .label { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.2rem; }

.admin-block { background: var(--surface); border-radius: var(--radius); padding: 1.25rem; margin-bottom: 1rem; box-shadow: var(--shadow); }
.admin-block h3 { margin: 0 0 0.75rem; font-size: 1.05rem; }
.admin-block h4 { margin: 1rem 0 0.5rem; font-size: 0.95rem; }
.admin-block label { display: block; margin-bottom: 0.5rem; }
.admin-block input { max-width: 280px; }

.grid-tags { display: grid; grid-template-columns: repeat(auto-fill, minmax(52px, 1fr)); gap: 0.5rem; }
.tag-chip { padding: 0.4rem 0.6rem; border-radius: 8px; font-size: 0.85rem; text-align: center; font-weight: 500; }
.tag-chip.free { background: #d1fae5; color: #047857; }
.tag-chip.used { background: #fee2e2; color: #b91c1c; }