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

body.auth-page {
    font-family: 'Segoe UI', 'Poppins', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--brand-gradient);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

body.auth-page::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.14) 0%, rgba(255, 255, 255, 0) 70%);
    border-radius: 50%;
}

.login-wrapper,
.register-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    position: relative;
    z-index: 1;
}

.login-card,
.register-card {
    background: var(--surface-color);
    border-radius: 24px;
    box-shadow: var(--shadow-strong);
    padding: 2.5rem;
    animation: slideUp 0.45s ease-out;
    border: 1px solid var(--border-color);
}

.login-card {
    max-width: 480px;
    width: 100%;
}

@media (min-width: 768px) {
    .login-card,
    .register-card {
        padding: 3.5rem 3rem;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 900;
    background: var(--brand-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.auth-title {
    color: var(--heading-color);
    font-size: 1.75rem;
}

.subtitle {
    color: var(--muted-text);
    font-size: 0.95rem;
    line-height: 1.5;
}

.form-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.input-group {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: box-shadow 0.2s ease;
}

.register-card .input-group {
    border-radius: 8px;
}

.input-group:focus-within {
    box-shadow: 0 0 0 3px rgba(var(--brand-start-rgb), 0.14), 0 2px 8px rgba(var(--brand-start-rgb), 0.18);
}

.input-group-text {
    background: var(--brand-gradient);
    border: none;
    color: white;
    padding: 0.875rem 1rem;
    font-size: 1.1rem;
}

.form-control,
.form-select {
    border: 2px solid var(--border-color);
    padding: 0.875rem 1rem;
    font-size: 0.95rem;
    transition: border-color 0.2s ease, background-color 0.2s ease;
    background: var(--surface-muted);
}

.form-control {
    border-top-right-radius: 8px !important;
    border-bottom-right-radius: 8px !important;
}

.register-card .form-control,
.register-card .form-select {
    border-left: none;
}

.form-control:focus,
.form-select:focus {
    outline: none;
    box-shadow: none;
    border-color: var(--primary-color);
    background: var(--surface-color);
}

.register-card .form-select {
    border: 2px solid var(--border-color);
    border-radius: 8px;
}

.register-card .form-select:focus {
    box-shadow: 0 0 0 3px rgba(var(--brand-start-rgb), 0.14);
}

.btn-primary {
    background: var(--brand-gradient);
    border: none;
    padding: 1rem;
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 0.3px;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    box-shadow: 0 12px 22px rgba(var(--brand-start-rgb), 0.24);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 26px rgba(var(--brand-start-rgb), 0.28);
    background: linear-gradient(135deg, var(--primary-strong) 0%, var(--primary-color) 55%, var(--brand-end) 100%);
}

.btn-primary:active {
    transform: translateY(0);
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 2rem 0 1.5rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 2px solid var(--border-color);
}

.divider span {
    padding: 0 1.25rem;
    color: var(--muted-text);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.social-btn {
    border: 2px solid var(--border-color);
    padding: 0.875rem;
    border-radius: 12px;
    transition: color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    background: var(--surface-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.95rem;
}

.register-card .social-btn {
    border-radius: 8px;
}

.social-btn i {
    font-size: 1.2rem;
}

.social-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    box-shadow: 0 6px 14px rgba(var(--brand-start-rgb), 0.14);
    background: rgba(var(--brand-start-rgb), 0.04);
}

.password-toggle {
    cursor: pointer;
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--muted-text);
    z-index: 10;
    font-size: 1.1rem;
    transition: color 0.2s;
}

.password-toggle:hover {
    color: var(--primary-color);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;
}

a:hover {
    color: var(--brand-end);
    text-decoration: underline;
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.form-check-input:focus {
    box-shadow: 0 0 0 0.25rem rgba(var(--brand-start-rgb), 0.15);
}

.form-check-label,
.terms-label {
    font-size: 0.875rem;
    color: var(--muted-text);
}

.alert {
    border-radius: 12px;
    border: none;
    padding: 1rem 1.25rem;
}

.back-home {
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
}

.back-home:hover {
    background: rgba(255, 255, 255, 0.15);
    color: white;
}

.login-link,
.register-link {
    color: var(--muted-text);
}

.password-strength {
    height: 5px;
    background: var(--border-color);
    border-radius: 10px;
    margin-top: 0.625rem;
    overflow: hidden;
}

.password-strength-bar {
    height: 100%;
    width: 0;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    border-radius: 10px;
}

.strength-weak {
    background: linear-gradient(90deg, #dc3545, #e74c3c);
    width: 33%;
}

.strength-medium {
    background: linear-gradient(90deg, #ffc107, #ffb300);
    width: 66%;
}

.strength-strong {
    background: linear-gradient(90deg, #28a745, #20c997);
    width: 100%;
}