:root {
    --guest-bg-start: #667eea;
    --guest-bg-end: #764ba2;
    --guest-card-bg: rgba(255, 255, 255, 0.95);
    --guest-text-color: #212529;
    --guest-muted-text-color: #6c757d;
    --guest-link-color: #0d6efd;
    --guest-input-focus-border: #764ba2;
    --guest-input-focus-shadow: rgba(118, 75, 162, 0.25);
    --guest-btn-bg-start: #667eea;
    --guest-btn-bg-end: #764ba2;
}

html[data-bs-theme="dark"] {
    --guest-bg-start: #2c3e50;
    --guest-bg-end: #34495e;
    --guest-card-bg: rgba(40, 45, 50, 0.95);
    --guest-text-color: #f8f9fa;
    --guest-muted-text-color: #adb5bd;
    --guest-link-color: #58a6ff;
    --guest-input-focus-border: #58a6ff;
    --guest-input-focus-shadow: rgba(88, 166, 255, 0.25);
    --guest-btn-bg-start: #58a6ff;
    --guest-btn-bg-end: #3670b3;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, var(--guest-bg-start) 0%, var(--guest-bg-end) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 1rem;
    color: var(--guest-text-color);
}
.auth-card {
    background-color: var(--guest-card-bg);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    animation: fadeInScale 0.7s ease-out forwards;
}
@keyframes fadeInScale {
    from { opacity: 0; transform: scale(0.95) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}
.auth-card .card-header {
    background-color: transparent;
    border-bottom: none;
    padding-top: 2rem;
    padding-bottom: 0;
}
 .auth-card .card-body {
     padding: 2rem;
 }
.auth-logo {
    width: 80px;
    height: 80px;
    margin-bottom: 1rem;
    object-fit: contain;
}
.auth-card h3, .auth-card p.small {
    color: var(--guest-text-color);
}
.auth-card p.small .text-decoration-none {
    color: var(--guest-link-color);
}
.auth-card .text-muted {
    color: var(--guest-muted-text-color) !important;
}

.form-control:focus {
     border-color: var(--guest-input-focus-border);
     box-shadow: 0 0 0 0.25rem var(--guest-input-focus-shadow);
}
.btn-primary {
     background: linear-gradient(135deg, var(--guest-btn-bg-start) 0%, var(--guest-btn-bg-end) 100%);
     border: none;
     transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}
.btn-primary:hover {
     transform: translateY(-2px);
     box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}
html[data-bs-theme="dark"] .form-control,
html[data-bs-theme="dark"] .form-select {
    background-color: #2b3035;
    color: #f8f9fa;
    border-color: #495057;
}
html[data-bs-theme="dark"] .form-control::placeholder {
    color: #6c757d;
}
html[data-bs-theme="dark"] label {
     color: #adb5bd;
}