* { box-sizing: border-box; margin: 0; padding: 0; font-family: system-ui, -apple-system, sans-serif; }

body { background: #f4f6f9; color: #333; }

/* Login Page */
.login-body { display: flex; align-items: center; justify-content: center; height: 100vh; background: #1e293b; }
.login-card { background: #fff; padding: 2rem; border-radius: 10px; width: 100%; max-width: 400px; box-shadow: 0 10px 25px rgba(0,0,0,0.2); }
.login-card h2 { margin-bottom: 1.5rem; text-align: center; color: #0f172a; }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; }
.form-group input { width: 100%; padding: 0.75rem; border: 1px solid #cbd5e1; border-radius: 6px; font-size: 1rem; }
.btn-primary { width: 100%; padding: 0.75rem; background: #2563eb; color: #fff; border: none; border-radius: 6px; font-size: 1rem; font-weight: bold; cursor: pointer; }
.alert-error { background: #fee2e2; color: #991b1b; padding: 0.75rem; border-radius: 6px; margin-bottom: 1rem; font-size: 0.9rem; }

/* Dashboard Header */
.top-bar { display: flex; justify-content: space-between; align-items: center; padding: 1rem 2rem; background: #0f172a; color: #fff; }
.counter-info { display: flex; align-items: center; gap: 1rem; }
.badge { padding: 0.25rem 0.75rem; border-radius: 20px; font-size: 0.85rem; font-weight: bold; }
.floor-badge { background: #0284c7; }
.pref-badge { background: #16a34a; }
.btn-logout { color: #f87171; text-decoration: none; font-weight: bold; }

/* Main Container & Banner */
.container { max-width: 600px; margin: 2rem auto; padding: 0 1rem; text-align: center; }
.banner { padding: 1.5rem; border-radius: 12px; margin-bottom: 1.5rem; color: #fff; transition: all 0.3s ease; }
.banner-success { background: #16a34a; }
.banner-error { background: #dc2626; }
.student-box { margin-top: 1rem; padding: 0.75rem; background: rgba(255,255,255,0.2); border-radius: 8px; font-size: 1.1rem; }
.hidden { display: none; }

/* Scanner Container */
.scanner-container { background: #fff; padding: 1.5rem; border-radius: 12px; box-shadow: 0 4px 12px rgba(0,0,0,0.05); }
.scan-instruction { margin-top: 1rem; font-weight: 600; color: #64748b; }