:root {
  --bg: #f5f5f5;
  --surface: #ffffff;
  --primary: #1a1a2e;
  --accent: #e94560;
  --text: #333;
  --muted: #666;
  --border: #ddd;
  --success: #27ae60;
  --warning: #f39c12;
  --danger: #e74c3c;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

nav {
  background: var(--primary);
  color: white;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav a { color: white; text-decoration: none; margin-left: 1rem; opacity: 0.8; }
nav a:hover { opacity: 1; }
nav .logo { font-weight: 700; font-size: 1.1rem; opacity: 1; }

.container { max-width: 960px; margin: 2rem auto; padding: 0 1rem; }

.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

h1 { font-size: 1.6rem; margin-bottom: 1.5rem; color: var(--primary); }
h2 { font-size: 1.2rem; margin-bottom: 1rem; }

.btn {
  display: inline-block;
  padding: 0.5rem 1.2rem;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  transition: opacity 0.2s;
}
.btn:hover { opacity: 0.85; }
.btn-primary { background: var(--accent); color: white; }
.btn-secondary { background: var(--primary); color: white; }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-sm { padding: 0.3rem 0.8rem; font-size: 0.8rem; }

input, select, textarea {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}
input:focus, select:focus { outline: none; border-color: var(--accent); }

label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 0.3rem; color: var(--muted); }

.form-group { margin-bottom: 0.5rem; }

.alert {
  padding: 0.8rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  display: none;
}
.alert-error { background: #fde8e8; color: var(--danger); border: 1px solid #f5c6c6; }
.alert-success { background: #e8fde8; color: var(--success); border: 1px solid #c6f5c6; }

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-green { background: #d4edda; color: var(--success); }
.badge-red { background: #f8d7da; color: var(--danger); }
.badge-yellow { background: #fff3cd; color: var(--warning); }
.badge-gray { background: #e2e3e5; color: #555; }

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th { text-align: left; padding: 0.75rem; border-bottom: 2px solid var(--border); color: var(--muted); font-size: 0.8rem; text-transform: uppercase; }
td { padding: 0.75rem; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg); }

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

.item-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.item-card h3 { font-size: 1rem; }
.item-card p { font-size: 0.85rem; color: var(--muted); flex: 1; }
.item-card label { cursor: pointer; display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; font-weight: normal; color: var(--text); }
.item-card input[type=checkbox] { width: auto; margin: 0; }

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
}
.login-box {
  background: white;
  border-radius: var(--radius);
  padding: 2.5rem;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}
.login-box h1 { text-align: center; margin-bottom: 0.5rem; }
.login-box p { text-align: center; color: var(--muted); margin-bottom: 1.5rem; font-size: 0.9rem; }

.tabs { display: flex; gap: 0.5rem; margin-bottom: 1.5rem; border-bottom: 2px solid var(--border); }
.tab { padding: 0.6rem 1rem; cursor: pointer; border: none; background: none; font-size: 0.9rem; color: var(--muted); border-bottom: 2px solid transparent; margin-bottom: -2px; }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

.section { display: none; }
.section.active { display: block; }

#locker-banner {
  background: var(--primary);
  color: white;
  text-align: center;
  padding: 0.8rem;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.stat-card { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); padding: 1rem; text-align: center; }
.stat-card .num { font-size: 2rem; font-weight: 700; color: var(--accent); }
.stat-card .label { font-size: 0.8rem; color: var(--muted); }

@media (max-width: 600px) {
  nav { padding: 1rem; }
  .container { padding: 0 0.75rem; margin: 1rem auto; }
}